FFmpeg  2.8.14
avcodec.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23 
24 /**
25  * @file
26  * @ingroup libavc
27  * Libavcodec external API header
28  */
29 
30 #include <errno.h>
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
42 
43 #include "version.h"
44 
45 /**
46  * @defgroup libavc Encoding/Decoding Library
47  * @{
48  *
49  * @defgroup lavc_decoding Decoding
50  * @{
51  * @}
52  *
53  * @defgroup lavc_encoding Encoding
54  * @{
55  * @}
56  *
57  * @defgroup lavc_codec Codecs
58  * @{
59  * @defgroup lavc_codec_native Native Codecs
60  * @{
61  * @}
62  * @defgroup lavc_codec_wrappers External library wrappers
63  * @{
64  * @}
65  * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
66  * @{
67  * @}
68  * @}
69  * @defgroup lavc_internal Internal
70  * @{
71  * @}
72  * @}
73  *
74  */
75 
76 /**
77  * @defgroup lavc_core Core functions/structures.
78  * @ingroup libavc
79  *
80  * Basic definitions, functions for querying libavcodec capabilities,
81  * allocating core structures, etc.
82  * @{
83  */
84 
85 
86 /**
87  * Identify the syntax and semantics of the bitstream.
88  * The principle is roughly:
89  * Two decoders with the same ID can decode the same streams.
90  * Two encoders with the same ID can encode compatible streams.
91  * There may be slight deviations from the principle due to implementation
92  * details.
93  *
94  * If you add a codec ID to this list, add it so that
95  * 1. no value of a existing codec ID changes (that would break ABI),
96  * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
97  * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
98  *
99  * After adding new codec IDs, do not forget to add an entry to the codec
100  * descriptor list and bump libavcodec minor version.
101  */
102 enum AVCodecID {
104 
105  /* video codecs */
107  AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
108 #if FF_API_XVMC
109  AV_CODEC_ID_MPEG2VIDEO_XVMC,
110 #endif /* FF_API_XVMC */
298 
299  AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
300  AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
301  AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
302  AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
303  AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
304 
305  AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
306  AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
307  AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
308  AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
309  AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
310  AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
311  AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
312  AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
313  AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
314  AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
315  AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
316  AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
317  AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
318  AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
319  AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
320  AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
321  AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
322  AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
323  AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
324  AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'),
325 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
326  AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'),
327  AV_CODEC_ID_APNG = MKBETAG('A','P','N','G'),
328 
329  /* various PCM "codecs" */
330  AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
365 
366  /* various ADPCM codecs */
398  AV_CODEC_ID_ADPCM_VIMA = MKBETAG('V','I','M','A'),
399 #if FF_API_VIMA_DECODER
400  AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
401 #endif
402  AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
403  AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
404  AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
405  AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
406  AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'),
407  AV_CODEC_ID_ADPCM_THP_LE = MKBETAG('T','H','P','L'),
408 
409  /* AMR */
412 
413  /* RealAudio codecs*/
416 
417  /* various DPCM codecs */
422 
423  /* audio codecs */
424  AV_CODEC_ID_MP2 = 0x15000,
425  AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
442  AV_CODEC_ID_GSM, ///< as in Berlin toast format
454  AV_CODEC_ID_GSM_MS, /* as found in WAV */
456 #if FF_API_VOXWARE
458 #endif
494  AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
495  AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
496  AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
497  AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
498  AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
499  AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
500  AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
501  AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
502  AV_CODEC_ID_DSD_LSBF = MKBETAG('D','S','D','L'),
503  AV_CODEC_ID_DSD_MSBF = MKBETAG('D','S','D','M'),
506  AV_CODEC_ID_4GV = MKBETAG('s','4','g','v'),
507 
508  /* subtitle codecs */
509  AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
512  AV_CODEC_ID_TEXT, ///< raw UTF-8 text
519  AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
520  AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
521  AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
522  AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
523  AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
524  AV_CODEC_ID_STL = MKBETAG('S','p','T','L'),
525  AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
526  AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
527  AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
528  AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
529  AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
530  AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
531  AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
532  AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
534 
535  /* other specific kind of codecs (generally used for attachments) */
536  AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
537  AV_CODEC_ID_TTF = 0x18000,
538  AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
539  AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
540  AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
541  AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
542  AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
543  AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
544  AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'),
545  AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'),
546 
547 
548  AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
549 
550  AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
551  * stream (only used by libavformat) */
552  AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
553  * stream (only used by libavformat) */
554  AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
555 
556 #if FF_API_CODEC_ID
557 #include "old_codec_ids.h"
558 #endif
559 };
560 
561 /**
562  * This struct describes the properties of a single codec described by an
563  * AVCodecID.
564  * @see avcodec_descriptor_get()
565  */
566 typedef struct AVCodecDescriptor {
567  enum AVCodecID id;
569  /**
570  * Name of the codec described by this descriptor. It is non-empty and
571  * unique for each codec descriptor. It should contain alphanumeric
572  * characters and '_' only.
573  */
574  const char *name;
575  /**
576  * A more descriptive name for this codec. May be NULL.
577  */
578  const char *long_name;
579  /**
580  * Codec properties, a combination of AV_CODEC_PROP_* flags.
581  */
582  int props;
583 
584  /**
585  * MIME type(s) associated with the codec.
586  * May be NULL; if not, a NULL-terminated array of MIME types.
587  * The first item is always non-NULL and is the preferred MIME type.
588  */
589  const char *const *mime_types;
592 /**
593  * Codec uses only intra compression.
594  * Video codecs only.
595  */
596 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
597 /**
598  * Codec supports lossy compression. Audio and video codecs only.
599  * @note a codec may support both lossy and lossless
600  * compression modes
601  */
602 #define AV_CODEC_PROP_LOSSY (1 << 1)
603 /**
604  * Codec supports lossless compression. Audio and video codecs only.
605  */
606 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
607 /**
608  * Codec supports frame reordering. That is, the coded order (the order in which
609  * the encoded packets are output by the encoders / stored / input to the
610  * decoders) may be different from the presentation order of the corresponding
611  * frames.
612  *
613  * For codecs that do not have this property set, PTS and DTS should always be
614  * equal.
615  */
616 #define AV_CODEC_PROP_REORDER (1 << 3)
617 /**
618  * Subtitle codec is bitmap based
619  * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
620  */
621 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
622 /**
623  * Subtitle codec is text based.
624  * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
625  */
626 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
628 /**
629  * @ingroup lavc_decoding
630  * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
631  * This is mainly needed because some optimized bitstream readers read
632  * 32 or 64 bit at once and could read over the end.<br>
633  * Note: If the first 23 bits of the additional bytes are not 0, then damaged
634  * MPEG bitstreams could cause overread and segfault.
635  */
636 #define AV_INPUT_BUFFER_PADDING_SIZE 32
638 /**
639  * @ingroup lavc_encoding
640  * minimum encoding buffer size
641  * Used to avoid some checks during header writing.
642  */
643 #define AV_INPUT_BUFFER_MIN_SIZE 16384
645 #if FF_API_WITHOUT_PREFIX
646 /**
647  * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
648  */
649 #define FF_INPUT_BUFFER_PADDING_SIZE 32
651 /**
652  * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
653  */
654 #define FF_MIN_BUFFER_SIZE 16384
655 #endif /* FF_API_WITHOUT_PREFIX */
657 /**
658  * @ingroup lavc_encoding
659  * motion estimation type.
660  * @deprecated use codec private option instead
661  */
662 #if FF_API_MOTION_EST
664  ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
668  ME_EPZS, ///< enhanced predictive zonal search
669  ME_X1, ///< reserved for experiments
670  ME_HEX, ///< hexagon based search
671  ME_UMH, ///< uneven multi-hexagon search
672  ME_TESA, ///< transformed exhaustive search algorithm
673  ME_ITER=50, ///< iterative search
674 };
675 #endif
677 /**
678  * @ingroup lavc_decoding
679  */
681  /* We leave some space between them for extensions (drop some
682  * keyframes for intra-only or drop just some bidir frames). */
683  AVDISCARD_NONE =-16, ///< discard nothing
684  AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
685  AVDISCARD_NONREF = 8, ///< discard all non reference
686  AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
687  AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
688  AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
689  AVDISCARD_ALL = 48, ///< discard all
690 };
702  AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
703 };
705 /**
706  * @ingroup lavc_encoding
707  */
708 typedef struct RcOverride{
709  int start_frame;
710  int end_frame;
711  int qscale; // If this is 0 then quality_factor will be used instead.
712  float quality_factor;
715 #if FF_API_MAX_BFRAMES
716 /**
717  * @deprecated there is no libavcodec-wide limit on the number of B-frames
718  */
719 #define FF_MAX_B_FRAMES 16
720 #endif
722 /* encoding support
723  These flags can be passed in AVCodecContext.flags before initialization.
724  Note: Not everything is supported yet.
725 */
727 /**
728  * Allow decoders to produce frames with data planes that are not aligned
729  * to CPU requirements (e.g. due to cropping).
730  */
731 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
732 /**
733  * Use fixed qscale.
734  */
735 #define AV_CODEC_FLAG_QSCALE (1 << 1)
736 /**
737  * 4 MV per MB allowed / advanced prediction for H.263.
738  */
739 #define AV_CODEC_FLAG_4MV (1 << 2)
740 /**
741  * Output even those frames that might be corrupted.
742  */
743 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
744 /**
745  * Use qpel MC.
746  */
747 #define AV_CODEC_FLAG_QPEL (1 << 4)
748 /**
749  * Use internal 2pass ratecontrol in first pass mode.
750  */
751 #define AV_CODEC_FLAG_PASS1 (1 << 9)
752 /**
753  * Use internal 2pass ratecontrol in second pass mode.
754  */
755 #define AV_CODEC_FLAG_PASS2 (1 << 10)
756 /**
757  * loop filter.
758  */
759 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
760 /**
761  * Only decode/encode grayscale.
762  */
763 #define AV_CODEC_FLAG_GRAY (1 << 13)
764 /**
765  * error[?] variables will be set during encoding.
766  */
767 #define AV_CODEC_FLAG_PSNR (1 << 15)
768 /**
769  * Input bitstream might be truncated at a random location
770  * instead of only at frame boundaries.
771  */
772 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
773 /**
774  * Use interlaced DCT.
775  */
776 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
777 /**
778  * Force low delay.
779  */
780 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
781 /**
782  * Place global headers in extradata instead of every keyframe.
783  */
784 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
785 /**
786  * Use only bitexact stuff (except (I)DCT).
787  */
788 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
789 /* Fx : Flag for h263+ extra options */
790 /**
791  * H.263 advanced intra coding / MPEG-4 AC prediction
792  */
793 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
794 /**
795  * interlaced motion estimation
796  */
797 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
798 /**
799  * Allow non spec compliant speedup tricks.
800  */
801 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
803 #define AV_CODEC_FLAG2_FAST (1 << 0)
804 /**
805  * Skip bitstream encoding.
806  */
807 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
808 /**
809  * Place global headers at every keyframe instead of in extradata.
810  */
811 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
813 /**
814  * timecode is in drop frame format. DEPRECATED!!!!
815  */
816 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
818 /**
819  * Input bitstream might be truncated at a packet boundaries
820  * instead of only at frame boundaries.
821  */
822 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
823 /**
824  * Discard cropping information from SPS.
825  */
826 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
828 /**
829  * Show all frames before the first keyframe
830  */
831 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
832 /**
833  * Export motion vectors through frame side data
834  */
835 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
836 /**
837  * Do not skip samples and export skip information as frame side data
838  */
839 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
841 /* Unsupported options :
842  * Syntax Arithmetic coding (SAC)
843  * Reference Picture Selection
844  * Independent Segment Decoding */
845 /* /Fx */
846 /* codec capabilities */
848 /**
849  * Decoder can use draw_horiz_band callback.
850  */
851 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
852 /**
853  * Codec uses get_buffer() for allocating buffers and supports custom allocators.
854  * If not set, it might not use get_buffer() at all or use operations that
855  * assume the buffer was allocated by avcodec_default_get_buffer.
856  */
857 #define AV_CODEC_CAP_DR1 (1 << 1)
858 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
859 /**
860  * Encoder or decoder requires flushing with NULL input at the end in order to
861  * give the complete and correct output.
862  *
863  * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
864  * with NULL data. The user can still send NULL data to the public encode
865  * or decode function, but libavcodec will not pass it along to the codec
866  * unless this flag is set.
867  *
868  * Decoders:
869  * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
870  * avpkt->size=0 at the end to get the delayed data until the decoder no longer
871  * returns frames.
872  *
873  * Encoders:
874  * The encoder needs to be fed with NULL data at the end of encoding until the
875  * encoder no longer returns data.
876  *
877  * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
878  * flag also means that the encoder must set the pts and duration for
879  * each output packet. If this flag is not set, the pts and duration will
880  * be determined by libavcodec from the input frame.
881  */
882 #define AV_CODEC_CAP_DELAY (1 << 5)
883 /**
884  * Codec can be fed a final frame with a smaller size.
885  * This can be used to prevent truncation of the last audio samples.
886  */
887 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
889 #if FF_API_CAP_VDPAU
890 /**
891  * Codec can export data for HW decoding (VDPAU).
892  */
893 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
894 #endif
896 /**
897  * Codec can output multiple frames per AVPacket
898  * Normally demuxers return one frame at a time, demuxers which do not do
899  * are connected to a parser to split what they return into proper frames.
900  * This flag is reserved to the very rare category of codecs which have a
901  * bitstream that cannot be split into frames without timeconsuming
902  * operations like full decoding. Demuxers carring such bitstreams thus
903  * may return multiple frames in a packet. This has many disadvantages like
904  * prohibiting stream copy in many cases thus it should only be considered
905  * as a last resort.
906  */
907 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
908 /**
909  * Codec is experimental and is thus avoided in favor of non experimental
910  * encoders
911  */
912 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
913 /**
914  * Codec should fill in channel configuration and samplerate instead of container
915  */
916 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
917 /**
918  * Codec supports frame-level multithreading.
919  */
920 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
921 /**
922  * Codec supports slice-based (or partition-based) multithreading.
923  */
924 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
925 /**
926  * Codec supports changed parameters at any point.
927  */
928 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
929 /**
930  * Codec supports avctx->thread_count == 0 (auto).
931  */
932 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
933 /**
934  * Audio encoder supports receiving a different number of samples in each call.
935  */
936 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
937 /**
938  * Codec is intra only.
939  */
940 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
941 /**
942  * Codec is lossless.
943  */
944 #define AV_CODEC_CAP_LOSSLESS 0x80000000
945 
947 #if FF_API_WITHOUT_PREFIX
948 /**
949  * Allow decoders to produce frames with data planes that are not aligned
950  * to CPU requirements (e.g. due to cropping).
951  */
952 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
953 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
954 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
955 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
956 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
957 #if FF_API_GMC
958 /**
959  * @deprecated use the "gmc" private option of the libxvid encoder
960  */
961 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
962 #endif
963 #if FF_API_MV0
964 /**
965  * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
966  * mpegvideo encoders
967  */
968 #define CODEC_FLAG_MV0 0x0040
969 #endif
970 #if FF_API_INPUT_PRESERVED
971 /**
972  * @deprecated passing reference-counted frames to the encoders replaces this
973  * flag
974  */
975 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
976 #endif
977 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
978 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
979 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
980 #if FF_API_EMU_EDGE
981 /**
982  * @deprecated edges are not used/required anymore. I.e. this flag is now always
983  * set.
984  */
985 #define CODEC_FLAG_EMU_EDGE 0x4000
986 #endif
987 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
988 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
989 
990 #if FF_API_NORMALIZE_AQP
991 /**
992  * @deprecated use the flag "naq" in the "mpv_flags" private option of the
993  * mpegvideo encoders
994  */
995 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
996 #endif
997 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
998 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
999 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
1000 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
1001 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1002 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1003 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1004 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1005 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1006 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1007 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1008 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1009 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1010 
1011 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1012 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1013 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1014 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1015 
1016 /* Unsupported options :
1017  * Syntax Arithmetic coding (SAC)
1018  * Reference Picture Selection
1019  * Independent Segment Decoding */
1020 /* /Fx */
1021 /* codec capabilities */
1022 
1023 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1024 /**
1025  * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1026  * If not set, it might not use get_buffer() at all or use operations that
1027  * assume the buffer was allocated by avcodec_default_get_buffer.
1028  */
1029 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1030 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1031 #if FF_API_XVMC
1032 /* Codec can export data for HW decoding. This flag indicates that
1033  * the codec would call get_format() with list that might contain HW accelerated
1034  * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1035  * including raw image format.
1036  * The application can use the passed context to determine bitstream version,
1037  * chroma format, resolution etc.
1038  */
1039 #define CODEC_CAP_HWACCEL 0x0010
1040 #endif /* FF_API_XVMC */
1041 /**
1042  * Encoder or decoder requires flushing with NULL input at the end in order to
1043  * give the complete and correct output.
1044  *
1045  * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1046  * with NULL data. The user can still send NULL data to the public encode
1047  * or decode function, but libavcodec will not pass it along to the codec
1048  * unless this flag is set.
1049  *
1050  * Decoders:
1051  * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1052  * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1053  * returns frames.
1054  *
1055  * Encoders:
1056  * The encoder needs to be fed with NULL data at the end of encoding until the
1057  * encoder no longer returns data.
1058  *
1059  * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1060  * flag also means that the encoder must set the pts and duration for
1061  * each output packet. If this flag is not set, the pts and duration will
1062  * be determined by libavcodec from the input frame.
1063  */
1064 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1065 /**
1066  * Codec can be fed a final frame with a smaller size.
1067  * This can be used to prevent truncation of the last audio samples.
1068  */
1069 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1070 #if FF_API_CAP_VDPAU
1071 /**
1072  * Codec can export data for HW decoding (VDPAU).
1073  */
1074 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1075 #endif
1076 /**
1077  * Codec can output multiple frames per AVPacket
1078  * Normally demuxers return one frame at a time, demuxers which do not do
1079  * are connected to a parser to split what they return into proper frames.
1080  * This flag is reserved to the very rare category of codecs which have a
1081  * bitstream that cannot be split into frames without timeconsuming
1082  * operations like full decoding. Demuxers carring such bitstreams thus
1083  * may return multiple frames in a packet. This has many disadvantages like
1084  * prohibiting stream copy in many cases thus it should only be considered
1085  * as a last resort.
1086  */
1087 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1088 /**
1089  * Codec is experimental and is thus avoided in favor of non experimental
1090  * encoders
1091  */
1092 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1093 /**
1094  * Codec should fill in channel configuration and samplerate instead of container
1095  */
1096 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1097 #if FF_API_NEG_LINESIZES
1098 /**
1099  * @deprecated no codecs use this capability
1100  */
1101 #define CODEC_CAP_NEG_LINESIZES 0x0800
1102 #endif
1103 /**
1104  * Codec supports frame-level multithreading.
1105  */
1106 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1107 /**
1108  * Codec supports slice-based (or partition-based) multithreading.
1109  */
1110 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1111 /**
1112  * Codec supports changed parameters at any point.
1113  */
1114 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1115 /**
1116  * Codec supports avctx->thread_count == 0 (auto).
1117  */
1118 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1119 /**
1120  * Audio encoder supports receiving a different number of samples in each call.
1121  */
1122 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1123 /**
1124  * Codec is intra only.
1125  */
1126 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1127 /**
1128  * Codec is lossless.
1129  */
1130 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1131 
1132 /**
1133  * HWAccel is experimental and is thus avoided in favor of non experimental
1134  * codecs
1135  */
1136 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1137 #endif /* FF_API_WITHOUT_PREFIX */
1138 
1139 #if FF_API_MB_TYPE
1140 //The following defines may change, don't expect compatibility if you use them.
1141 #define MB_TYPE_INTRA4x4 0x0001
1142 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1143 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1144 #define MB_TYPE_16x16 0x0008
1145 #define MB_TYPE_16x8 0x0010
1146 #define MB_TYPE_8x16 0x0020
1147 #define MB_TYPE_8x8 0x0040
1148 #define MB_TYPE_INTERLACED 0x0080
1149 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1150 #define MB_TYPE_ACPRED 0x0200
1151 #define MB_TYPE_GMC 0x0400
1152 #define MB_TYPE_SKIP 0x0800
1153 #define MB_TYPE_P0L0 0x1000
1154 #define MB_TYPE_P1L0 0x2000
1155 #define MB_TYPE_P0L1 0x4000
1156 #define MB_TYPE_P1L1 0x8000
1157 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1158 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1159 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1160 #define MB_TYPE_QUANT 0x00010000
1161 #define MB_TYPE_CBP 0x00020000
1162 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1163 #endif
1164 
1165 /**
1166  * Pan Scan area.
1167  * This specifies the area which should be displayed.
1168  * Note there may be multiple such areas for one frame.
1169  */
1170 typedef struct AVPanScan{
1171  /**
1172  * id
1173  * - encoding: Set by user.
1174  * - decoding: Set by libavcodec.
1175  */
1176  int id;
1177 
1178  /**
1179  * width and height in 1/16 pel
1180  * - encoding: Set by user.
1181  * - decoding: Set by libavcodec.
1182  */
1183  int width;
1184  int height;
1185 
1186  /**
1187  * position of the top left corner in 1/16 pel for up to 3 fields/frames
1188  * - encoding: Set by user.
1189  * - decoding: Set by libavcodec.
1190  */
1191  int16_t position[3][2];
1192 }AVPanScan;
1193 
1194 #if FF_API_QSCALE_TYPE
1195 #define FF_QSCALE_TYPE_MPEG1 0
1196 #define FF_QSCALE_TYPE_MPEG2 1
1197 #define FF_QSCALE_TYPE_H264 2
1198 #define FF_QSCALE_TYPE_VP56 3
1199 #endif
1200 
1201 #if FF_API_GET_BUFFER
1202 #define FF_BUFFER_TYPE_INTERNAL 1
1203 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1204 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1205 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1206 
1207 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1208 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1209 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1210 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1211 #endif
1212 
1213 /**
1214  * The decoder will keep a reference to the frame and may reuse it later.
1215  */
1216 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1217 
1218 /**
1219  * @defgroup lavc_packet AVPacket
1220  *
1221  * Types and functions for working with AVPacket.
1222  * @{
1223  */
1227 
1228  /**
1229  * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1230  * @code
1231  * u32le param_flags
1232  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1233  * s32le channel_count
1234  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1235  * u64le channel_layout
1236  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1237  * s32le sample_rate
1238  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1239  * s32le width
1240  * s32le height
1241  * @endcode
1242  */
1244 
1245  /**
1246  * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1247  * structures with info about macroblocks relevant to splitting the
1248  * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1249  * That is, it does not necessarily contain info about all macroblocks,
1250  * as long as the distance between macroblocks in the info is smaller
1251  * than the target payload size.
1252  * Each MB info structure is 12 bytes, and is laid out as follows:
1253  * @code
1254  * u32le bit offset from the start of the packet
1255  * u8 current quantizer at the start of the macroblock
1256  * u8 GOB number
1257  * u16le macroblock address within the GOB
1258  * u8 horizontal MV predictor
1259  * u8 vertical MV predictor
1260  * u8 horizontal MV predictor for block number 3
1261  * u8 vertical MV predictor for block number 3
1262  * @endcode
1263  */
1265 
1266  /**
1267  * This side data should be associated with an audio stream and contains
1268  * ReplayGain information in form of the AVReplayGain struct.
1269  */
1271 
1272  /**
1273  * This side data contains a 3x3 transformation matrix describing an affine
1274  * transformation that needs to be applied to the decoded video frames for
1275  * correct presentation.
1276  *
1277  * See libavutil/display.h for a detailed description of the data.
1278  */
1280 
1281  /**
1282  * This side data should be associated with a video stream and contains
1283  * Stereoscopic 3D information in form of the AVStereo3D struct.
1284  */
1286 
1287  /**
1288  * This side data should be associated with an audio stream and corresponds
1289  * to enum AVAudioServiceType.
1290  */
1292 
1293  /**
1294  * This side data contains quality related information from the encoder.
1295  * @code
1296  * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1297  * u8 picture type
1298  * u8 error count
1299  * u16 reserved
1300  * u64le[error count] sum of squared differences between encoder in and output
1301  * @endcode
1302  */
1304 
1305  /**
1306  * Recommmends skipping the specified number of samples
1307  * @code
1308  * u32le number of samples to skip from start of this packet
1309  * u32le number of samples to skip from end of this packet
1310  * u8 reason for start skip
1311  * u8 reason for end skip (0=padding silence, 1=convergence)
1312  * @endcode
1313  */
1315 
1316  /**
1317  * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1318  * the packet may contain "dual mono" audio specific to Japanese DTV
1319  * and if it is true, recommends only the selected channel to be used.
1320  * @code
1321  * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1322  * @endcode
1323  */
1325 
1326  /**
1327  * A list of zero terminated key/value strings. There is no end marker for
1328  * the list, so it is required to rely on the side data size to stop.
1329  */
1331 
1332  /**
1333  * Subtitle event position
1334  * @code
1335  * u32le x1
1336  * u32le y1
1337  * u32le x2
1338  * u32le y2
1339  * @endcode
1340  */
1342 
1343  /**
1344  * Data found in BlockAdditional element of matroska container. There is
1345  * no end marker for the data, so it is required to rely on the side data
1346  * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1347  * by data.
1348  */
1350 
1351  /**
1352  * The optional first identifier line of a WebVTT cue.
1353  */
1355 
1356  /**
1357  * The optional settings (rendering instructions) that immediately
1358  * follow the timestamp specifier of a WebVTT cue.
1359  */
1361 
1362  /**
1363  * A list of zero terminated key/value strings. There is no end marker for
1364  * the list, so it is required to rely on the side data size to stop. This
1365  * side data includes updated metadata which appeared in the stream.
1366  */
1368 
1369  /**
1370  * The number of side data elements (in fact a bit more than it).
1371  * This is not part of the public API/ABI in the sense that it may
1372  * change when new side data types are added.
1373  * This must stay the last enum value.
1374  * If its value becomes huge, some code using it
1375  * needs to be updated as it assumes it to be smaller than other limits.
1376  */
1378 };
1379 
1380 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1381 
1382 typedef struct AVPacketSideData {
1383  uint8_t *data;
1384  int size;
1387 
1388 /**
1389  * This structure stores compressed data. It is typically exported by demuxers
1390  * and then passed as input to decoders, or received as output from encoders and
1391  * then passed to muxers.
1392  *
1393  * For video, it should typically contain one compressed frame. For audio it may
1394  * contain several compressed frames.
1395  *
1396  * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1397  * ABI. Thus it may be allocated on stack and no new fields can be added to it
1398  * without libavcodec and libavformat major bump.
1399  *
1400  * The semantics of data ownership depends on the buf or destruct (deprecated)
1401  * fields. If either is set, the packet data is dynamically allocated and is
1402  * valid indefinitely until av_free_packet() is called (which in turn calls
1403  * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1404  * the packet data is typically backed by some static buffer somewhere and is
1405  * only valid for a limited time (e.g. until the next read call when demuxing).
1406  *
1407  * The side data is always allocated with av_malloc() and is freed in
1408  * av_free_packet().
1409  */
1410 typedef struct AVPacket {
1411  /**
1412  * A reference to the reference-counted buffer where the packet data is
1413  * stored.
1414  * May be NULL, then the packet data is not reference-counted.
1415  */
1417  /**
1418  * Presentation timestamp in AVStream->time_base units; the time at which
1419  * the decompressed packet will be presented to the user.
1420  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1421  * pts MUST be larger or equal to dts as presentation cannot happen before
1422  * decompression, unless one wants to view hex dumps. Some formats misuse
1423  * the terms dts and pts/cts to mean something different. Such timestamps
1424  * must be converted to true pts/dts before they are stored in AVPacket.
1425  */
1426  int64_t pts;
1427  /**
1428  * Decompression timestamp in AVStream->time_base units; the time at which
1429  * the packet is decompressed.
1430  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1431  */
1432  int64_t dts;
1433  uint8_t *data;
1434  int size;
1436  /**
1437  * A combination of AV_PKT_FLAG values
1438  */
1439  int flags;
1440  /**
1441  * Additional packet data that can be provided by the container.
1442  * Packet can contain several types of side information.
1443  */
1446 
1447  /**
1448  * Duration of this packet in AVStream->time_base units, 0 if unknown.
1449  * Equals next_pts - this_pts in presentation order.
1450  */
1452 #if FF_API_DESTRUCT_PACKET
1454  void (*destruct)(struct AVPacket *);
1456  void *priv;
1457 #endif
1458  int64_t pos; ///< byte position in stream, -1 if unknown
1459 
1460  /**
1461  * Time difference in AVStream->time_base units from the pts of this
1462  * packet to the point at which the output from the decoder has converged
1463  * independent from the availability of previous frames. That is, the
1464  * frames are virtually identical no matter if decoding started from
1465  * the very first frame or from this keyframe.
1466  * Is AV_NOPTS_VALUE if unknown.
1467  * This field is not the display duration of the current packet.
1468  * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1469  * set.
1470  *
1471  * The purpose of this field is to allow seeking in streams that have no
1472  * keyframes in the conventional sense. It corresponds to the
1473  * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1474  * essential for some types of subtitle streams to ensure that all
1475  * subtitles are correctly displayed after seeking.
1476  */
1478 } AVPacket;
1479 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1480 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1481 
1487 };
1488 /**
1489  * @}
1490  */
1491 
1492 struct AVCodecInternal;
1493 
1497  AV_FIELD_TT, //< Top coded_first, top displayed first
1498  AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1499  AV_FIELD_TB, //< Top coded first, bottom displayed first
1500  AV_FIELD_BT, //< Bottom coded first, top displayed first
1501 };
1502 
1503 /**
1504  * main external API structure.
1505  * New fields can be added to the end with minor version bumps.
1506  * Removal, reordering and changes to existing fields require a major
1507  * version bump.
1508  * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1509  * applications.
1510  * sizeof(AVCodecContext) must not be used outside libav*.
1511  */
1512 typedef struct AVCodecContext {
1513  /**
1514  * information on struct for av_log
1515  * - set by avcodec_alloc_context3
1516  */
1519 
1520  enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1521  const struct AVCodec *codec;
1522 #if FF_API_CODEC_NAME
1523  /**
1524  * @deprecated this field is not used for anything in libavcodec
1525  */
1527  char codec_name[32];
1528 #endif
1529  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1530 
1531  /**
1532  * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1533  * This is used to work around some encoder bugs.
1534  * A demuxer should set this to what is stored in the field used to identify the codec.
1535  * If there are multiple such fields in a container then the demuxer should choose the one
1536  * which maximizes the information about the used codec.
1537  * If the codec tag field in a container is larger than 32 bits then the demuxer should
1538  * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1539  * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1540  * first.
1541  * - encoding: Set by user, if not then the default based on codec_id will be used.
1542  * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1543  */
1544  unsigned int codec_tag;
1545 
1546 #if FF_API_STREAM_CODEC_TAG
1547  /**
1548  * @deprecated this field is unused
1549  */
1551  unsigned int stream_codec_tag;
1552 #endif
1553 
1554  void *priv_data;
1555 
1556  /**
1557  * Private context used for internal data.
1558  *
1559  * Unlike priv_data, this is not codec-specific. It is used in general
1560  * libavcodec functions.
1561  */
1562  struct AVCodecInternal *internal;
1563 
1564  /**
1565  * Private data of the user, can be used to carry app specific stuff.
1566  * - encoding: Set by user.
1567  * - decoding: Set by user.
1568  */
1569  void *opaque;
1570 
1571  /**
1572  * the average bitrate
1573  * - encoding: Set by user; unused for constant quantizer encoding.
1574  * - decoding: Set by user, may be overwritten by libavcodec
1575  * if this info is available in the stream
1576  */
1578 
1579  /**
1580  * number of bits the bitstream is allowed to diverge from the reference.
1581  * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1582  * - encoding: Set by user; unused for constant quantizer encoding.
1583  * - decoding: unused
1584  */
1586 
1587  /**
1588  * Global quality for codecs which cannot change it per frame.
1589  * This should be proportional to MPEG-1/2/4 qscale.
1590  * - encoding: Set by user.
1591  * - decoding: unused
1592  */
1594 
1595  /**
1596  * - encoding: Set by user.
1597  * - decoding: unused
1598  */
1600 #define FF_COMPRESSION_DEFAULT -1
1601 
1602  /**
1603  * AV_CODEC_FLAG_*.
1604  * - encoding: Set by user.
1605  * - decoding: Set by user.
1606  */
1607  int flags;
1608 
1609  /**
1610  * AV_CODEC_FLAG2_*
1611  * - encoding: Set by user.
1612  * - decoding: Set by user.
1613  */
1614  int flags2;
1615 
1616  /**
1617  * some codecs need / can use extradata like Huffman tables.
1618  * mjpeg: Huffman tables
1619  * rv10: additional flags
1620  * mpeg4: global headers (they can be in the bitstream or here)
1621  * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1622  * than extradata_size to avoid problems if it is read with the bitstream reader.
1623  * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1624  * - encoding: Set/allocated/freed by libavcodec.
1625  * - decoding: Set/allocated/freed by user.
1626  */
1627  uint8_t *extradata;
1629 
1630  /**
1631  * This is the fundamental unit of time (in seconds) in terms
1632  * of which frame timestamps are represented. For fixed-fps content,
1633  * timebase should be 1/framerate and timestamp increments should be
1634  * identically 1.
1635  * This often, but not always is the inverse of the frame rate or field rate
1636  * for video.
1637  * - encoding: MUST be set by user.
1638  * - decoding: the use of this field for decoding is deprecated.
1639  * Use framerate instead.
1640  */
1642 
1643  /**
1644  * For some codecs, the time base is closer to the field rate than the frame rate.
1645  * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1646  * if no telecine is used ...
1647  *
1648  * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1649  */
1651 
1652  /**
1653  * Codec delay.
1654  *
1655  * Encoding: Number of frames delay there will be from the encoder input to
1656  * the decoder output. (we assume the decoder matches the spec)
1657  * Decoding: Number of frames delay in addition to what a standard decoder
1658  * as specified in the spec would produce.
1659  *
1660  * Video:
1661  * Number of frames the decoded output will be delayed relative to the
1662  * encoded input.
1663  *
1664  * Audio:
1665  * For encoding, this field is unused (see initial_padding).
1666  *
1667  * For decoding, this is the number of samples the decoder needs to
1668  * output before the decoder's output is valid. When seeking, you should
1669  * start decoding this many samples prior to your desired seek point.
1670  *
1671  * - encoding: Set by libavcodec.
1672  * - decoding: Set by libavcodec.
1673  */
1674  int delay;
1675 
1676 
1677  /* video only */
1678  /**
1679  * picture width / height.
1680  *
1681  * @note Those fields may not match the values of the last
1682  * AVFrame outputted by avcodec_decode_video2 due frame
1683  * reordering.
1684  *
1685  * - encoding: MUST be set by user.
1686  * - decoding: May be set by the user before opening the decoder if known e.g.
1687  * from the container. Some decoders will require the dimensions
1688  * to be set by the caller. During decoding, the decoder may
1689  * overwrite those values as required while parsing the data.
1690  */
1692 
1693  /**
1694  * Bitstream width / height, may be different from width/height e.g. when
1695  * the decoded frame is cropped before being output or lowres is enabled.
1696  *
1697  * @note Those field may not match the value of the last
1698  * AVFrame outputted by avcodec_decode_video2 due frame
1699  * reordering.
1700  *
1701  * - encoding: unused
1702  * - decoding: May be set by the user before opening the decoder if known
1703  * e.g. from the container. During decoding, the decoder may
1704  * overwrite those values as required while parsing the data.
1705  */
1706  int coded_width, coded_height;
1707 
1708 #if FF_API_ASPECT_EXTENDED
1709 #define FF_ASPECT_EXTENDED 15
1710 #endif
1711 
1712  /**
1713  * the number of pictures in a group of pictures, or 0 for intra_only
1714  * - encoding: Set by user.
1715  * - decoding: unused
1716  */
1718 
1719  /**
1720  * Pixel format, see AV_PIX_FMT_xxx.
1721  * May be set by the demuxer if known from headers.
1722  * May be overridden by the decoder if it knows better.
1723  *
1724  * @note This field may not match the value of the last
1725  * AVFrame outputted by avcodec_decode_video2 due frame
1726  * reordering.
1727  *
1728  * - encoding: Set by user.
1729  * - decoding: Set by user if known, overridden by libavcodec while
1730  * parsing the data.
1731  */
1733 
1734 #if FF_API_MOTION_EST
1735  /**
1736  * This option does nothing
1737  * @deprecated use codec private options instead
1738  */
1740 #endif
1741 
1742  /**
1743  * If non NULL, 'draw_horiz_band' is called by the libavcodec
1744  * decoder to draw a horizontal band. It improves cache usage. Not
1745  * all codecs can do that. You must check the codec capabilities
1746  * beforehand.
1747  * When multithreading is used, it may be called from multiple threads
1748  * at the same time; threads might draw different parts of the same AVFrame,
1749  * or multiple AVFrames, and there is no guarantee that slices will be drawn
1750  * in order.
1751  * The function is also used by hardware acceleration APIs.
1752  * It is called at least once during frame decoding to pass
1753  * the data needed for hardware render.
1754  * In that mode instead of pixel data, AVFrame points to
1755  * a structure specific to the acceleration API. The application
1756  * reads the structure and can change some fields to indicate progress
1757  * or mark state.
1758  * - encoding: unused
1759  * - decoding: Set by user.
1760  * @param height the height of the slice
1761  * @param y the y position of the slice
1762  * @param type 1->top field, 2->bottom field, 3->frame
1763  * @param offset offset into the AVFrame.data from which the slice should be read
1764  */
1765  void (*draw_horiz_band)(struct AVCodecContext *s,
1766  const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1767  int y, int type, int height);
1768 
1769  /**
1770  * callback to negotiate the pixelFormat
1771  * @param fmt is the list of formats which are supported by the codec,
1772  * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1773  * The first is always the native one.
1774  * @note The callback may be called again immediately if initialization for
1775  * the selected (hardware-accelerated) pixel format failed.
1776  * @warning Behavior is undefined if the callback returns a value not
1777  * in the fmt list of formats.
1778  * @return the chosen format
1779  * - encoding: unused
1780  * - decoding: Set by user, if not set the native format will be chosen.
1781  */
1782  enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1783 
1784  /**
1785  * maximum number of B-frames between non-B-frames
1786  * Note: The output will be delayed by max_b_frames+1 relative to the input.
1787  * - encoding: Set by user.
1788  * - decoding: unused
1789  */
1791 
1792  /**
1793  * qscale factor between IP and B-frames
1794  * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1795  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1796  * - encoding: Set by user.
1797  * - decoding: unused
1798  */
1800 
1801 #if FF_API_RC_STRATEGY
1802  /** @deprecated use codec private option instead */
1804 #define FF_RC_STRATEGY_XVID 1
1805 #endif
1806 
1808 
1809  /**
1810  * qscale offset between IP and B-frames
1811  * - encoding: Set by user.
1812  * - decoding: unused
1813  */
1815 
1816  /**
1817  * Size of the frame reordering buffer in the decoder.
1818  * For MPEG-2 it is 1 IPB or 0 low delay IP.
1819  * - encoding: Set by libavcodec.
1820  * - decoding: Set by libavcodec.
1821  */
1823 
1824  /**
1825  * 0-> h263 quant 1-> mpeg quant
1826  * - encoding: Set by user.
1827  * - decoding: unused
1828  */
1830 
1831  /**
1832  * qscale factor between P and I-frames
1833  * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1834  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1835  * - encoding: Set by user.
1836  * - decoding: unused
1837  */
1839 
1840  /**
1841  * qscale offset between P and I-frames
1842  * - encoding: Set by user.
1843  * - decoding: unused
1844  */
1846 
1847  /**
1848  * luminance masking (0-> disabled)
1849  * - encoding: Set by user.
1850  * - decoding: unused
1851  */
1853 
1854  /**
1855  * temporary complexity masking (0-> disabled)
1856  * - encoding: Set by user.
1857  * - decoding: unused
1858  */
1860 
1861  /**
1862  * spatial complexity masking (0-> disabled)
1863  * - encoding: Set by user.
1864  * - decoding: unused
1865  */
1867 
1868  /**
1869  * p block masking (0-> disabled)
1870  * - encoding: Set by user.
1871  * - decoding: unused
1872  */
1873  float p_masking;
1874 
1875  /**
1876  * darkness masking (0-> disabled)
1877  * - encoding: Set by user.
1878  * - decoding: unused
1879  */
1881 
1882  /**
1883  * slice count
1884  * - encoding: Set by libavcodec.
1885  * - decoding: Set by user (or 0).
1886  */
1888  /**
1889  * prediction method (needed for huffyuv)
1890  * - encoding: Set by user.
1891  * - decoding: unused
1892  */
1894 #define FF_PRED_LEFT 0
1895 #define FF_PRED_PLANE 1
1896 #define FF_PRED_MEDIAN 2
1897 
1898  /**
1899  * slice offsets in the frame in bytes
1900  * - encoding: Set/allocated by libavcodec.
1901  * - decoding: Set/allocated by user (or NULL).
1902  */
1904 
1905  /**
1906  * sample aspect ratio (0 if unknown)
1907  * That is the width of a pixel divided by the height of the pixel.
1908  * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1909  * - encoding: Set by user.
1910  * - decoding: Set by libavcodec.
1911  */
1913 
1914  /**
1915  * motion estimation comparison function
1916  * - encoding: Set by user.
1917  * - decoding: unused
1918  */
1919  int me_cmp;
1920  /**
1921  * subpixel motion estimation comparison function
1922  * - encoding: Set by user.
1923  * - decoding: unused
1924  */
1926  /**
1927  * macroblock comparison function (not supported yet)
1928  * - encoding: Set by user.
1929  * - decoding: unused
1930  */
1931  int mb_cmp;
1932  /**
1933  * interlaced DCT comparison function
1934  * - encoding: Set by user.
1935  * - decoding: unused
1936  */
1938 #define FF_CMP_SAD 0
1939 #define FF_CMP_SSE 1
1940 #define FF_CMP_SATD 2
1941 #define FF_CMP_DCT 3
1942 #define FF_CMP_PSNR 4
1943 #define FF_CMP_BIT 5
1944 #define FF_CMP_RD 6
1945 #define FF_CMP_ZERO 7
1946 #define FF_CMP_VSAD 8
1947 #define FF_CMP_VSSE 9
1948 #define FF_CMP_NSSE 10
1949 #define FF_CMP_W53 11
1950 #define FF_CMP_W97 12
1951 #define FF_CMP_DCTMAX 13
1952 #define FF_CMP_DCT264 14
1953 #define FF_CMP_CHROMA 256
1954 
1955  /**
1956  * ME diamond size & shape
1957  * - encoding: Set by user.
1958  * - decoding: unused
1959  */
1961 
1962  /**
1963  * amount of previous MV predictors (2a+1 x 2a+1 square)
1964  * - encoding: Set by user.
1965  * - decoding: unused
1966  */
1968 
1969  /**
1970  * prepass for motion estimation
1971  * - encoding: Set by user.
1972  * - decoding: unused
1973  */
1974  int pre_me;
1975 
1976  /**
1977  * motion estimation prepass comparison function
1978  * - encoding: Set by user.
1979  * - decoding: unused
1980  */
1982 
1983  /**
1984  * ME prepass diamond size & shape
1985  * - encoding: Set by user.
1986  * - decoding: unused
1987  */
1989 
1990  /**
1991  * subpel ME quality
1992  * - encoding: Set by user.
1993  * - decoding: unused
1994  */
1996 
1997 #if FF_API_AFD
1998  /**
1999  * DTG active format information (additional aspect ratio
2000  * information only used in DVB MPEG-2 transport streams)
2001  * 0 if not set.
2002  *
2003  * - encoding: unused
2004  * - decoding: Set by decoder.
2005  * @deprecated Deprecated in favor of AVSideData
2006  */
2008 #define FF_DTG_AFD_SAME 8
2009 #define FF_DTG_AFD_4_3 9
2010 #define FF_DTG_AFD_16_9 10
2011 #define FF_DTG_AFD_14_9 11
2012 #define FF_DTG_AFD_4_3_SP_14_9 13
2013 #define FF_DTG_AFD_16_9_SP_14_9 14
2014 #define FF_DTG_AFD_SP_4_3 15
2015 #endif /* FF_API_AFD */
2016 
2017  /**
2018  * maximum motion estimation search range in subpel units
2019  * If 0 then no limit.
2020  *
2021  * - encoding: Set by user.
2022  * - decoding: unused
2023  */
2025 
2026 #if FF_API_QUANT_BIAS
2027  /**
2028  * @deprecated use encoder private option instead
2029  */
2031 #define FF_DEFAULT_QUANT_BIAS 999999
2032 
2033  /**
2034  * @deprecated use encoder private option instead
2035  */
2037 #endif
2038 
2039  /**
2040  * slice flags
2041  * - encoding: unused
2042  * - decoding: Set by user.
2043  */
2045 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2046 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2047 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2048 
2049 #if FF_API_XVMC
2050  /**
2051  * XVideo Motion Acceleration
2052  * - encoding: forbidden
2053  * - decoding: set by decoder
2054  * @deprecated XvMC doesn't need it anymore.
2055  */
2056  attribute_deprecated int xvmc_acceleration;
2057 #endif /* FF_API_XVMC */
2058 
2059  /**
2060  * macroblock decision mode
2061  * - encoding: Set by user.
2062  * - decoding: unused
2063  */
2065 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2066 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2067 #define FF_MB_DECISION_RD 2 ///< rate distortion
2068 
2069  /**
2070  * custom intra quantization matrix
2071  * - encoding: Set by user, can be NULL.
2072  * - decoding: Set by libavcodec.
2073  */
2074  uint16_t *intra_matrix;
2075 
2076  /**
2077  * custom inter quantization matrix
2078  * - encoding: Set by user, can be NULL.
2079  * - decoding: Set by libavcodec.
2080  */
2081  uint16_t *inter_matrix;
2082 
2083  /**
2084  * scene change detection threshold
2085  * 0 is default, larger means fewer detected scene changes.
2086  * - encoding: Set by user.
2087  * - decoding: unused
2088  */
2090 
2091  /**
2092  * noise reduction strength
2093  * - encoding: Set by user.
2094  * - decoding: unused
2095  */
2097 
2098 #if FF_API_MPV_OPT
2099  /**
2100  * @deprecated this field is unused
2101  */
2104 
2105  /**
2106  * @deprecated this field is unused
2107  */
2110 #endif
2111 
2112  /**
2113  * precision of the intra DC coefficient - 8
2114  * - encoding: Set by user.
2115  * - decoding: Set by libavcodec
2116  */
2118 
2119  /**
2120  * Number of macroblock rows at the top which are skipped.
2121  * - encoding: unused
2122  * - decoding: Set by user.
2123  */
2125 
2126  /**
2127  * Number of macroblock rows at the bottom which are skipped.
2128  * - encoding: unused
2129  * - decoding: Set by user.
2130  */
2132 
2133 #if FF_API_MPV_OPT
2134  /**
2135  * @deprecated use encoder private options instead
2136  */
2139 #endif
2140 
2141  /**
2142  * minimum MB lagrange multipler
2143  * - encoding: Set by user.
2144  * - decoding: unused
2145  */
2146  int mb_lmin;
2147 
2148  /**
2149  * maximum MB lagrange multipler
2150  * - encoding: Set by user.
2151  * - decoding: unused
2152  */
2153  int mb_lmax;
2154 
2155  /**
2156  *
2157  * - encoding: Set by user.
2158  * - decoding: unused
2159  */
2161 
2162  /**
2163  *
2164  * - encoding: Set by user.
2165  * - decoding: unused
2166  */
2168 
2169  /**
2170  *
2171  * - encoding: Set by user.
2172  * - decoding: unused
2173  */
2175 
2176  /**
2177  * minimum GOP size
2178  * - encoding: Set by user.
2179  * - decoding: unused
2180  */
2182 
2183  /**
2184  * number of reference frames
2185  * - encoding: Set by user.
2186  * - decoding: Set by lavc.
2187  */
2188  int refs;
2189 
2190  /**
2191  * chroma qp offset from luma
2192  * - encoding: Set by user.
2193  * - decoding: unused
2194  */
2196 
2197 #if FF_API_UNUSED_MEMBERS
2198  /**
2199  * Multiplied by qscale for each frame and added to scene_change_score.
2200  * - encoding: Set by user.
2201  * - decoding: unused
2202  */
2204 #endif
2205 
2206  /**
2207  *
2208  * Note: Value depends upon the compare function used for fullpel ME.
2209  * - encoding: Set by user.
2210  * - decoding: unused
2211  */
2213 
2214  /**
2215  * Adjust sensitivity of b_frame_strategy 1.
2216  * - encoding: Set by user.
2217  * - decoding: unused
2218  */
2220 
2221  /**
2222  * Chromaticity coordinates of the source primaries.
2223  * - encoding: Set by user
2224  * - decoding: Set by libavcodec
2225  */
2227 
2228  /**
2229  * Color Transfer Characteristic.
2230  * - encoding: Set by user
2231  * - decoding: Set by libavcodec
2232  */
2234 
2235  /**
2236  * YUV colorspace type.
2237  * - encoding: Set by user
2238  * - decoding: Set by libavcodec
2239  */
2241 
2242  /**
2243  * MPEG vs JPEG YUV range.
2244  * - encoding: Set by user
2245  * - decoding: Set by libavcodec
2246  */
2248 
2249  /**
2250  * This defines the location of chroma samples.
2251  * - encoding: Set by user
2252  * - decoding: Set by libavcodec
2253  */
2255 
2256  /**
2257  * Number of slices.
2258  * Indicates number of picture subdivisions. Used for parallelized
2259  * decoding.
2260  * - encoding: Set by user
2261  * - decoding: unused
2262  */
2263  int slices;
2264 
2265  /** Field order
2266  * - encoding: set by libavcodec
2267  * - decoding: Set by user.
2268  */
2270 
2271  /* audio only */
2272  int sample_rate; ///< samples per second
2273  int channels; ///< number of audio channels
2274 
2275  /**
2276  * audio sample format
2277  * - encoding: Set by user.
2278  * - decoding: Set by libavcodec.
2279  */
2280  enum AVSampleFormat sample_fmt; ///< sample format
2281 
2282  /* The following data should not be initialized. */
2283  /**
2284  * Number of samples per channel in an audio frame.
2285  *
2286  * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2287  * except the last must contain exactly frame_size samples per channel.
2288  * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2289  * frame size is not restricted.
2290  * - decoding: may be set by some decoders to indicate constant frame size
2291  */
2293 
2294  /**
2295  * Frame counter, set by libavcodec.
2296  *
2297  * - decoding: total number of frames returned from the decoder so far.
2298  * - encoding: total number of frames passed to the encoder so far.
2299  *
2300  * @note the counter is not incremented if encoding/decoding resulted in
2301  * an error.
2302  */
2304 
2305  /**
2306  * number of bytes per packet if constant and known or 0
2307  * Used by some WAV based audio codecs.
2308  */
2310 
2311  /**
2312  * Audio cutoff bandwidth (0 means "automatic")
2313  * - encoding: Set by user.
2314  * - decoding: unused
2315  */
2316  int cutoff;
2317 
2318 #if FF_API_REQUEST_CHANNELS
2319  /**
2320  * Decoder should decode to this many channels if it can (0 for default)
2321  * - encoding: unused
2322  * - decoding: Set by user.
2323  * @deprecated Deprecated in favor of request_channel_layout.
2324  */
2326 #endif
2327 
2328  /**
2329  * Audio channel layout.
2330  * - encoding: set by user.
2331  * - decoding: set by user, may be overwritten by libavcodec.
2332  */
2333  uint64_t channel_layout;
2334 
2335  /**
2336  * Request decoder to use this channel layout if it can (0 for default)
2337  * - encoding: unused
2338  * - decoding: Set by user.
2339  */
2341 
2342  /**
2343  * Type of service that the audio stream conveys.
2344  * - encoding: Set by user.
2345  * - decoding: Set by libavcodec.
2346  */
2348 
2349  /**
2350  * desired sample format
2351  * - encoding: Not used.
2352  * - decoding: Set by user.
2353  * Decoder will decode to this format if it can.
2354  */
2356 
2357 #if FF_API_GET_BUFFER
2358  /**
2359  * Called at the beginning of each frame to get a buffer for it.
2360  *
2361  * The function will set AVFrame.data[], AVFrame.linesize[].
2362  * AVFrame.extended_data[] must also be set, but it should be the same as
2363  * AVFrame.data[] except for planar audio with more channels than can fit
2364  * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2365  * many data pointers as it can hold.
2366  *
2367  * if CODEC_CAP_DR1 is not set then get_buffer() must call
2368  * avcodec_default_get_buffer() instead of providing buffers allocated by
2369  * some other means.
2370  *
2371  * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2372  * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2373  * but if get_buffer() is overridden then alignment considerations should
2374  * be taken into account.
2375  *
2376  * @see avcodec_default_get_buffer()
2377  *
2378  * Video:
2379  *
2380  * If pic.reference is set then the frame will be read later by libavcodec.
2381  * avcodec_align_dimensions2() should be used to find the required width and
2382  * height, as they normally need to be rounded up to the next multiple of 16.
2383  *
2384  * If frame multithreading is used and thread_safe_callbacks is set,
2385  * it may be called from a different thread, but not from more than one at
2386  * once. Does not need to be reentrant.
2387  *
2388  * @see release_buffer(), reget_buffer()
2389  * @see avcodec_align_dimensions2()
2390  *
2391  * Audio:
2392  *
2393  * Decoders request a buffer of a particular size by setting
2394  * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2395  * however, utilize only part of the buffer by setting AVFrame.nb_samples
2396  * to a smaller value in the output frame.
2397  *
2398  * Decoders cannot use the buffer after returning from
2399  * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2400  * is assumed to be released immediately upon return. In some rare cases,
2401  * a decoder may need to call get_buffer() more than once in a single
2402  * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2403  * called again after it has already been called once, the previously
2404  * acquired buffer is assumed to be released at that time and may not be
2405  * reused by the decoder.
2406  *
2407  * As a convenience, av_samples_get_buffer_size() and
2408  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2409  * functions to find the required data size and to fill data pointers and
2410  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2411  * since all planes must be the same size.
2412  *
2413  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2414  *
2415  * - encoding: unused
2416  * - decoding: Set by libavcodec, user can override.
2417  *
2418  * @deprecated use get_buffer2()
2419  */
2421  int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2422 
2423  /**
2424  * Called to release buffers which were allocated with get_buffer.
2425  * A released buffer can be reused in get_buffer().
2426  * pic.data[*] must be set to NULL.
2427  * May be called from a different thread if frame multithreading is used,
2428  * but not by more than one thread at once, so does not need to be reentrant.
2429  * - encoding: unused
2430  * - decoding: Set by libavcodec, user can override.
2431  *
2432  * @deprecated custom freeing callbacks should be set from get_buffer2()
2433  */
2435  void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2436 
2437  /**
2438  * Called at the beginning of a frame to get cr buffer for it.
2439  * Buffer type (size, hints) must be the same. libavcodec won't check it.
2440  * libavcodec will pass previous buffer in pic, function should return
2441  * same buffer or new buffer with old frame "painted" into it.
2442  * If pic.data[0] == NULL must behave like get_buffer().
2443  * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2444  * avcodec_default_reget_buffer() instead of providing buffers allocated by
2445  * some other means.
2446  * - encoding: unused
2447  * - decoding: Set by libavcodec, user can override.
2448  */
2450  int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2451 #endif
2452 
2453  /**
2454  * This callback is called at the beginning of each frame to get data
2455  * buffer(s) for it. There may be one contiguous buffer for all the data or
2456  * there may be a buffer per each data plane or anything in between. What
2457  * this means is, you may set however many entries in buf[] you feel necessary.
2458  * Each buffer must be reference-counted using the AVBuffer API (see description
2459  * of buf[] below).
2460  *
2461  * The following fields will be set in the frame before this callback is
2462  * called:
2463  * - format
2464  * - width, height (video only)
2465  * - sample_rate, channel_layout, nb_samples (audio only)
2466  * Their values may differ from the corresponding values in
2467  * AVCodecContext. This callback must use the frame values, not the codec
2468  * context values, to calculate the required buffer size.
2469  *
2470  * This callback must fill the following fields in the frame:
2471  * - data[]
2472  * - linesize[]
2473  * - extended_data:
2474  * * if the data is planar audio with more than 8 channels, then this
2475  * callback must allocate and fill extended_data to contain all pointers
2476  * to all data planes. data[] must hold as many pointers as it can.
2477  * extended_data must be allocated with av_malloc() and will be freed in
2478  * av_frame_unref().
2479  * * otherwise exended_data must point to data
2480  * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2481  * the frame's data and extended_data pointers must be contained in these. That
2482  * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2483  * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2484  * and av_buffer_ref().
2485  * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2486  * this callback and filled with the extra buffers if there are more
2487  * buffers than buf[] can hold. extended_buf will be freed in
2488  * av_frame_unref().
2489  *
2490  * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2491  * avcodec_default_get_buffer2() instead of providing buffers allocated by
2492  * some other means.
2493  *
2494  * Each data plane must be aligned to the maximum required by the target
2495  * CPU.
2496  *
2497  * @see avcodec_default_get_buffer2()
2498  *
2499  * Video:
2500  *
2501  * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2502  * (read and/or written to if it is writable) later by libavcodec.
2503  *
2504  * avcodec_align_dimensions2() should be used to find the required width and
2505  * height, as they normally need to be rounded up to the next multiple of 16.
2506  *
2507  * Some decoders do not support linesizes changing between frames.
2508  *
2509  * If frame multithreading is used and thread_safe_callbacks is set,
2510  * this callback may be called from a different thread, but not from more
2511  * than one at once. Does not need to be reentrant.
2512  *
2513  * @see avcodec_align_dimensions2()
2514  *
2515  * Audio:
2516  *
2517  * Decoders request a buffer of a particular size by setting
2518  * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2519  * however, utilize only part of the buffer by setting AVFrame.nb_samples
2520  * to a smaller value in the output frame.
2521  *
2522  * As a convenience, av_samples_get_buffer_size() and
2523  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2524  * functions to find the required data size and to fill data pointers and
2525  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2526  * since all planes must be the same size.
2527  *
2528  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2529  *
2530  * - encoding: unused
2531  * - decoding: Set by libavcodec, user can override.
2532  */
2533  int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2534 
2535  /**
2536  * If non-zero, the decoded audio and video frames returned from
2537  * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2538  * and are valid indefinitely. The caller must free them with
2539  * av_frame_unref() when they are not needed anymore.
2540  * Otherwise, the decoded frames must not be freed by the caller and are
2541  * only valid until the next decode call.
2542  *
2543  * - encoding: unused
2544  * - decoding: set by the caller before avcodec_open2().
2545  */
2547 
2548  /* - encoding parameters */
2549  float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2550  float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2551 
2552  /**
2553  * minimum quantizer
2554  * - encoding: Set by user.
2555  * - decoding: unused
2556  */
2557  int qmin;
2558 
2559  /**
2560  * maximum quantizer
2561  * - encoding: Set by user.
2562  * - decoding: unused
2563  */
2564  int qmax;
2565 
2566  /**
2567  * maximum quantizer difference between frames
2568  * - encoding: Set by user.
2569  * - decoding: unused
2570  */
2572 
2573 #if FF_API_MPV_OPT
2574  /**
2575  * @deprecated use encoder private options instead
2576  */
2578  float rc_qsquish;
2579 
2584 #endif
2585 
2586  /**
2587  * decoder bitstream buffer size
2588  * - encoding: Set by user.
2589  * - decoding: unused
2590  */
2592 
2593  /**
2594  * ratecontrol override, see RcOverride
2595  * - encoding: Allocated/set/freed by user.
2596  * - decoding: unused
2597  */
2600 
2601 #if FF_API_MPV_OPT
2602  /**
2603  * @deprecated use encoder private options instead
2604  */
2606  const char *rc_eq;
2607 #endif
2608 
2609  /**
2610  * maximum bitrate
2611  * - encoding: Set by user.
2612  * - decoding: Set by user, may be overwritten by libavcodec.
2613  */
2615 
2616  /**
2617  * minimum bitrate
2618  * - encoding: Set by user.
2619  * - decoding: unused
2620  */
2622 
2623 #if FF_API_MPV_OPT
2624  /**
2625  * @deprecated use encoder private options instead
2626  */
2629 
2632 #endif
2633 
2634  /**
2635  * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2636  * - encoding: Set by user.
2637  * - decoding: unused.
2638  */
2640 
2641  /**
2642  * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2643  * - encoding: Set by user.
2644  * - decoding: unused.
2645  */
2647 
2648  /**
2649  * Number of bits which should be loaded into the rc buffer before decoding starts.
2650  * - encoding: Set by user.
2651  * - decoding: unused
2652  */
2654 
2655 #define FF_CODER_TYPE_VLC 0
2656 #define FF_CODER_TYPE_AC 1
2657 #define FF_CODER_TYPE_RAW 2
2658 #define FF_CODER_TYPE_RLE 3
2659 #if FF_API_UNUSED_MEMBERS
2660 #define FF_CODER_TYPE_DEFLATE 4
2661 #endif /* FF_API_UNUSED_MEMBERS */
2662  /**
2663  * coder type
2664  * - encoding: Set by user.
2665  * - decoding: unused
2666  */
2668 
2669  /**
2670  * context model
2671  * - encoding: Set by user.
2672  * - decoding: unused
2673  */
2675 
2676 #if FF_API_MPV_OPT
2677  /**
2678  * @deprecated use encoder private options instead
2679  */
2681  int lmin;
2682 
2683  /**
2684  * @deprecated use encoder private options instead
2685  */
2687  int lmax;
2688 #endif
2689 
2690  /**
2691  * frame skip threshold
2692  * - encoding: Set by user.
2693  * - decoding: unused
2694  */
2696 
2697  /**
2698  * frame skip factor
2699  * - encoding: Set by user.
2700  * - decoding: unused
2701  */
2703 
2704  /**
2705  * frame skip exponent
2706  * - encoding: Set by user.
2707  * - decoding: unused
2708  */
2710 
2711  /**
2712  * frame skip comparison function
2713  * - encoding: Set by user.
2714  * - decoding: unused
2715  */
2717 
2718  /**
2719  * trellis RD quantization
2720  * - encoding: Set by user.
2721  * - decoding: unused
2722  */
2723  int trellis;
2724 
2725  /**
2726  * - encoding: Set by user.
2727  * - decoding: unused
2728  */
2730 
2731  /**
2732  * - encoding: Set by user.
2733  * - decoding: unused
2734  */
2736 
2737  /**
2738  * GOP timecode frame start number
2739  * - encoding: Set by user, in non drop frame format
2740  * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2741  */
2743 
2744  /* The RTP callback: This function is called */
2745  /* every time the encoder has a packet to send. */
2746  /* It depends on the encoder if the data starts */
2747  /* with a Start Code (it should). H.263 does. */
2748  /* mb_nb contains the number of macroblocks */
2749  /* encoded in the RTP payload. */
2750  void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2751 
2752  int rtp_payload_size; /* The size of the RTP payload: the coder will */
2753  /* do its best to deliver a chunk with size */
2754  /* below rtp_payload_size, the chunk will start */
2755  /* with a start code on some codecs like H.263. */
2756  /* This doesn't take account of any particular */
2757  /* headers inside the transmitted RTP payload. */
2758 
2759  /* statistics, used for 2-pass encoding */
2760  int mv_bits;
2764  int i_count;
2765  int p_count;
2768 
2769  /**
2770  * number of bits used for the previously encoded frame
2771  * - encoding: Set by libavcodec.
2772  * - decoding: unused
2773  */
2775 
2776  /**
2777  * pass1 encoding statistics output buffer
2778  * - encoding: Set by libavcodec.
2779  * - decoding: unused
2780  */
2781  char *stats_out;
2782 
2783  /**
2784  * pass2 encoding statistics input buffer
2785  * Concatenated stuff from stats_out of pass1 should be placed here.
2786  * - encoding: Allocated/set/freed by user.
2787  * - decoding: unused
2788  */
2789  char *stats_in;
2790 
2791  /**
2792  * Work around bugs in encoders which sometimes cannot be detected automatically.
2793  * - encoding: Set by user
2794  * - decoding: Set by user
2795  */
2797 #define FF_BUG_AUTODETECT 1 ///< autodetection
2798 #if FF_API_OLD_MSMPEG4
2799 #define FF_BUG_OLD_MSMPEG4 2
2800 #endif
2801 #define FF_BUG_XVID_ILACE 4
2802 #define FF_BUG_UMP4 8
2803 #define FF_BUG_NO_PADDING 16
2804 #define FF_BUG_AMV 32
2805 #if FF_API_AC_VLC
2806 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2807 #endif
2808 #define FF_BUG_QPEL_CHROMA 64
2809 #define FF_BUG_STD_QPEL 128
2810 #define FF_BUG_QPEL_CHROMA2 256
2811 #define FF_BUG_DIRECT_BLOCKSIZE 512
2812 #define FF_BUG_EDGE 1024
2813 #define FF_BUG_HPEL_CHROMA 2048
2814 #define FF_BUG_DC_CLIP 4096
2815 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2816 #define FF_BUG_TRUNCATED 16384
2817 
2818  /**
2819  * strictly follow the standard (MPEG4, ...).
2820  * - encoding: Set by user.
2821  * - decoding: Set by user.
2822  * Setting this to STRICT or higher means the encoder and decoder will
2823  * generally do stupid things, whereas setting it to unofficial or lower
2824  * will mean the encoder might produce output that is not supported by all
2825  * spec-compliant decoders. Decoders don't differentiate between normal,
2826  * unofficial and experimental (that is, they always try to decode things
2827  * when they can) unless they are explicitly asked to behave stupidly
2828  * (=strictly conform to the specs)
2829  */
2831 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2832 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2833 #define FF_COMPLIANCE_NORMAL 0
2834 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2835 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2836 
2837  /**
2838  * error concealment flags
2839  * - encoding: unused
2840  * - decoding: Set by user.
2841  */
2843 #define FF_EC_GUESS_MVS 1
2844 #define FF_EC_DEBLOCK 2
2845 #define FF_EC_FAVOR_INTER 256
2846 
2847  /**
2848  * debug
2849  * - encoding: Set by user.
2850  * - decoding: Set by user.
2851  */
2852  int debug;
2853 #define FF_DEBUG_PICT_INFO 1
2854 #define FF_DEBUG_RC 2
2855 #define FF_DEBUG_BITSTREAM 4
2856 #define FF_DEBUG_MB_TYPE 8
2857 #define FF_DEBUG_QP 16
2858 #if FF_API_DEBUG_MV
2859 /**
2860  * @deprecated this option does nothing
2861  */
2862 #define FF_DEBUG_MV 32
2863 #endif
2864 #define FF_DEBUG_DCT_COEFF 0x00000040
2865 #define FF_DEBUG_SKIP 0x00000080
2866 #define FF_DEBUG_STARTCODE 0x00000100
2867 #if FF_API_UNUSED_MEMBERS
2868 #define FF_DEBUG_PTS 0x00000200
2869 #endif /* FF_API_UNUSED_MEMBERS */
2870 #define FF_DEBUG_ER 0x00000400
2871 #define FF_DEBUG_MMCO 0x00000800
2872 #define FF_DEBUG_BUGS 0x00001000
2873 #if FF_API_DEBUG_MV
2874 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2875 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2876 #endif
2877 #define FF_DEBUG_BUFFERS 0x00008000
2878 #define FF_DEBUG_THREADS 0x00010000
2879 #define FF_DEBUG_GREEN_MD 0x00800000
2880 #define FF_DEBUG_NOMC 0x01000000
2881 
2882 #if FF_API_DEBUG_MV
2883  /**
2884  * debug
2885  * Code outside libavcodec should access this field using AVOptions
2886  * - encoding: Set by user.
2887  * - decoding: Set by user.
2888  */
2890 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2891 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2892 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2893 #endif
2894 
2895  /**
2896  * Error recognition; may misdetect some more or less valid parts as errors.
2897  * - encoding: unused
2898  * - decoding: Set by user.
2899  */
2901 
2902 /**
2903  * Verify checksums embedded in the bitstream (could be of either encoded or
2904  * decoded data, depending on the codec) and print an error message on mismatch.
2905  * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2906  * decoder returning an error.
2907  */
2908 #define AV_EF_CRCCHECK (1<<0)
2909 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2910 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2911 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2912 
2913 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2914 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
2915 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2916 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2917 
2918 
2919  /**
2920  * opaque 64bit number (generally a PTS) that will be reordered and
2921  * output in AVFrame.reordered_opaque
2922  * - encoding: unused
2923  * - decoding: Set by user.
2924  */
2926 
2927  /**
2928  * Hardware accelerator in use
2929  * - encoding: unused.
2930  * - decoding: Set by libavcodec
2931  */
2933 
2934  /**
2935  * Hardware accelerator context.
2936  * For some hardware accelerators, a global context needs to be
2937  * provided by the user. In that case, this holds display-dependent
2938  * data FFmpeg cannot instantiate itself. Please refer to the
2939  * FFmpeg HW accelerator documentation to know how to fill this
2940  * is. e.g. for VA API, this is a struct vaapi_context.
2941  * - encoding: unused
2942  * - decoding: Set by user
2943  */
2945 
2946  /**
2947  * error
2948  * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2949  * - decoding: unused
2950  */
2951  uint64_t error[AV_NUM_DATA_POINTERS];
2952 
2953  /**
2954  * DCT algorithm, see FF_DCT_* below
2955  * - encoding: Set by user.
2956  * - decoding: unused
2957  */
2959 #define FF_DCT_AUTO 0
2960 #define FF_DCT_FASTINT 1
2961 #define FF_DCT_INT 2
2962 #define FF_DCT_MMX 3
2963 #define FF_DCT_ALTIVEC 5
2964 #define FF_DCT_FAAN 6
2965 
2966  /**
2967  * IDCT algorithm, see FF_IDCT_* below.
2968  * - encoding: Set by user.
2969  * - decoding: Set by user.
2970  */
2972 #define FF_IDCT_AUTO 0
2973 #define FF_IDCT_INT 1
2974 #define FF_IDCT_SIMPLE 2
2975 #define FF_IDCT_SIMPLEMMX 3
2976 #define FF_IDCT_ARM 7
2977 #define FF_IDCT_ALTIVEC 8
2978 #if FF_API_ARCH_SH4
2979 #define FF_IDCT_SH4 9
2980 #endif
2981 #define FF_IDCT_SIMPLEARM 10
2982 #if FF_API_UNUSED_MEMBERS
2983 #define FF_IDCT_IPP 13
2984 #endif /* FF_API_UNUSED_MEMBERS */
2985 #define FF_IDCT_XVID 14
2986 #if FF_API_IDCT_XVIDMMX
2987 #define FF_IDCT_XVIDMMX 14
2988 #endif /* FF_API_IDCT_XVIDMMX */
2989 #define FF_IDCT_SIMPLEARMV5TE 16
2990 #define FF_IDCT_SIMPLEARMV6 17
2991 #if FF_API_ARCH_SPARC
2992 #define FF_IDCT_SIMPLEVIS 18
2993 #endif
2994 #define FF_IDCT_FAAN 20
2995 #define FF_IDCT_SIMPLENEON 22
2996 #if FF_API_ARCH_ALPHA
2997 #define FF_IDCT_SIMPLEALPHA 23
2998 #endif
2999 #define FF_IDCT_SIMPLEAUTO 128
3000 
3001  /**
3002  * bits per sample/pixel from the demuxer (needed for huffyuv).
3003  * - encoding: Set by libavcodec.
3004  * - decoding: Set by user.
3005  */
3007 
3008  /**
3009  * Bits per sample/pixel of internal libavcodec pixel/sample format.
3010  * - encoding: set by user.
3011  * - decoding: set by libavcodec.
3012  */
3014 
3015 #if FF_API_LOWRES
3016  /**
3017  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3018  * - encoding: unused
3019  * - decoding: Set by user.
3020  * Code outside libavcodec should access this field using:
3021  * av_codec_{get,set}_lowres(avctx)
3022  */
3023  int lowres;
3024 #endif
3025 
3026 #if FF_API_CODED_FRAME
3027  /**
3028  * the picture in the bitstream
3029  * - encoding: Set by libavcodec.
3030  * - decoding: unused
3031  *
3032  * @deprecated use the quality factor packet side data instead
3033  */
3035 #endif
3036 
3037  /**
3038  * thread count
3039  * is used to decide how many independent tasks should be passed to execute()
3040  * - encoding: Set by user.
3041  * - decoding: Set by user.
3042  */
3044 
3045  /**
3046  * Which multithreading methods to use.
3047  * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3048  * so clients which cannot provide future frames should not use it.
3049  *
3050  * - encoding: Set by user, otherwise the default is used.
3051  * - decoding: Set by user, otherwise the default is used.
3052  */
3054 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3055 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3056 
3057  /**
3058  * Which multithreading methods are in use by the codec.
3059  * - encoding: Set by libavcodec.
3060  * - decoding: Set by libavcodec.
3061  */
3063 
3064  /**
3065  * Set by the client if its custom get_buffer() callback can be called
3066  * synchronously from another thread, which allows faster multithreaded decoding.
3067  * draw_horiz_band() will be called from other threads regardless of this setting.
3068  * Ignored if the default get_buffer() is used.
3069  * - encoding: Set by user.
3070  * - decoding: Set by user.
3071  */
3073 
3074  /**
3075  * The codec may call this to execute several independent things.
3076  * It will return only after finishing all tasks.
3077  * The user may replace this with some multithreaded implementation,
3078  * the default implementation will execute the parts serially.
3079  * @param count the number of things to execute
3080  * - encoding: Set by libavcodec, user can override.
3081  * - decoding: Set by libavcodec, user can override.
3082  */
3083  int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3084 
3085  /**
3086  * The codec may call this to execute several independent things.
3087  * It will return only after finishing all tasks.
3088  * The user may replace this with some multithreaded implementation,
3089  * the default implementation will execute the parts serially.
3090  * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3091  * @param c context passed also to func
3092  * @param count the number of things to execute
3093  * @param arg2 argument passed unchanged to func
3094  * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3095  * @param func function that will be called count times, with jobnr from 0 to count-1.
3096  * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3097  * two instances of func executing at the same time will have the same threadnr.
3098  * @return always 0 currently, but code should handle a future improvement where when any call to func
3099  * returns < 0 no further calls to func may be done and < 0 is returned.
3100  * - encoding: Set by libavcodec, user can override.
3101  * - decoding: Set by libavcodec, user can override.
3102  */
3103  int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3104 
3105 #if FF_API_THREAD_OPAQUE
3106  /**
3107  * @deprecated this field should not be used from outside of lavc
3108  */
3111 #endif
3112 
3113  /**
3114  * noise vs. sse weight for the nsse comparison function
3115  * - encoding: Set by user.
3116  * - decoding: unused
3117  */
3119 
3120  /**
3121  * profile
3122  * - encoding: Set by user.
3123  * - decoding: Set by libavcodec.
3124  */
3125  int profile;
3126 #define FF_PROFILE_UNKNOWN -99
3127 #define FF_PROFILE_RESERVED -100
3128 
3129 #define FF_PROFILE_AAC_MAIN 0
3130 #define FF_PROFILE_AAC_LOW 1
3131 #define FF_PROFILE_AAC_SSR 2
3132 #define FF_PROFILE_AAC_LTP 3
3133 #define FF_PROFILE_AAC_HE 4
3134 #define FF_PROFILE_AAC_HE_V2 28
3135 #define FF_PROFILE_AAC_LD 22
3136 #define FF_PROFILE_AAC_ELD 38
3137 #define FF_PROFILE_MPEG2_AAC_LOW 128
3138 #define FF_PROFILE_MPEG2_AAC_HE 131
3139 
3140 #define FF_PROFILE_DTS 20
3141 #define FF_PROFILE_DTS_ES 30
3142 #define FF_PROFILE_DTS_96_24 40
3143 #define FF_PROFILE_DTS_HD_HRA 50
3144 #define FF_PROFILE_DTS_HD_MA 60
3145 #define FF_PROFILE_DTS_EXPRESS 70
3146 
3147 #define FF_PROFILE_MPEG2_422 0
3148 #define FF_PROFILE_MPEG2_HIGH 1
3149 #define FF_PROFILE_MPEG2_SS 2
3150 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3151 #define FF_PROFILE_MPEG2_MAIN 4
3152 #define FF_PROFILE_MPEG2_SIMPLE 5
3153 
3154 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3155 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3156 
3157 #define FF_PROFILE_H264_BASELINE 66
3158 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3159 #define FF_PROFILE_H264_MAIN 77
3160 #define FF_PROFILE_H264_EXTENDED 88
3161 #define FF_PROFILE_H264_HIGH 100
3162 #define FF_PROFILE_H264_HIGH_10 110
3163 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3164 #define FF_PROFILE_H264_HIGH_422 122
3165 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3166 #define FF_PROFILE_H264_HIGH_444 144
3167 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3168 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3169 #define FF_PROFILE_H264_CAVLC_444 44
3170 
3171 #define FF_PROFILE_VC1_SIMPLE 0
3172 #define FF_PROFILE_VC1_MAIN 1
3173 #define FF_PROFILE_VC1_COMPLEX 2
3174 #define FF_PROFILE_VC1_ADVANCED 3
3175 
3176 #define FF_PROFILE_MPEG4_SIMPLE 0
3177 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3178 #define FF_PROFILE_MPEG4_CORE 2
3179 #define FF_PROFILE_MPEG4_MAIN 3
3180 #define FF_PROFILE_MPEG4_N_BIT 4
3181 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3182 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3183 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3184 #define FF_PROFILE_MPEG4_HYBRID 8
3185 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3186 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3187 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3188 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3189 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3190 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3191 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3192 
3193 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3194 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3195 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3196 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3197 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3198 
3199 #define FF_PROFILE_VP9_0 0
3200 #define FF_PROFILE_VP9_1 1
3201 #define FF_PROFILE_VP9_2 2
3202 #define FF_PROFILE_VP9_3 3
3203 
3204 #define FF_PROFILE_HEVC_MAIN 1
3205 #define FF_PROFILE_HEVC_MAIN_10 2
3206 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3207 #define FF_PROFILE_HEVC_REXT 4
3208 
3209  /**
3210  * level
3211  * - encoding: Set by user.
3212  * - decoding: Set by libavcodec.
3213  */
3214  int level;
3215 #define FF_LEVEL_UNKNOWN -99
3216 
3217  /**
3218  * Skip loop filtering for selected frames.
3219  * - encoding: unused
3220  * - decoding: Set by user.
3221  */
3223 
3224  /**
3225  * Skip IDCT/dequantization for selected frames.
3226  * - encoding: unused
3227  * - decoding: Set by user.
3228  */
3230 
3231  /**
3232  * Skip decoding for selected frames.
3233  * - encoding: unused
3234  * - decoding: Set by user.
3235  */
3237 
3238  /**
3239  * Header containing style information for text subtitles.
3240  * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3241  * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3242  * the Format line following. It shouldn't include any Dialogue line.
3243  * - encoding: Set/allocated/freed by user (before avcodec_open2())
3244  * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3245  */
3248 
3249 #if FF_API_ERROR_RATE
3250  /**
3251  * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3252  * encoders
3253  */
3256 #endif
3257 
3258 #if FF_API_CODEC_PKT
3259  /**
3260  * @deprecated this field is not supposed to be accessed from outside lavc
3261  */
3264 #endif
3265 
3266  /**
3267  * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3268  * Used for compliant TS muxing.
3269  * - encoding: Set by libavcodec.
3270  * - decoding: unused.
3271  */
3272  uint64_t vbv_delay;
3273 
3274  /**
3275  * Encoding only. Allow encoders to output packets that do not contain any
3276  * encoded data, only side data.
3277  *
3278  * Some encoders need to output such packets, e.g. to update some stream
3279  * parameters at the end of encoding.
3280  *
3281  * All callers are strongly recommended to set this option to 1 and update
3282  * their code to deal with such packets, since this behaviour may become
3283  * always enabled in the future (then this option will be deprecated and
3284  * later removed). To avoid ABI issues when this happens, the callers should
3285  * use AVOptions to set this field.
3286  */
3288 
3289  /**
3290  * Audio only. The number of "priming" samples (padding) inserted by the
3291  * encoder at the beginning of the audio. I.e. this number of leading
3292  * decoded samples must be discarded by the caller to get the original audio
3293  * without leading padding.
3294  *
3295  * - decoding: unused
3296  * - encoding: Set by libavcodec. The timestamps on the output packets are
3297  * adjusted by the encoder so that they always refer to the
3298  * first sample of the data actually contained in the packet,
3299  * including any added padding. E.g. if the timebase is
3300  * 1/samplerate and the timestamp of the first input sample is
3301  * 0, the timestamp of the first output packet will be
3302  * -initial_padding.
3303  */
3305 
3306  /**
3307  * - decoding: For codecs that store a framerate value in the compressed
3308  * bitstream, the decoder may export it here. { 0, 1} when
3309  * unknown.
3310  * - encoding: unused
3311  */
3313 
3314  /**
3315  * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3316  * - encoding: unused.
3317  * - decoding: Set by libavcodec before calling get_format()
3318  */
3320 
3321  /**
3322  * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3323  * Code outside libavcodec should access this field using:
3324  * av_codec_{get,set}_pkt_timebase(avctx)
3325  * - encoding unused.
3326  * - decoding set by user.
3327  */
3329 
3330  /**
3331  * AVCodecDescriptor
3332  * Code outside libavcodec should access this field using:
3333  * av_codec_{get,set}_codec_descriptor(avctx)
3334  * - encoding: unused.
3335  * - decoding: set by libavcodec.
3336  */
3338 
3339 #if !FF_API_LOWRES
3340  /**
3341  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3342  * - encoding: unused
3343  * - decoding: Set by user.
3344  * Code outside libavcodec should access this field using:
3345  * av_codec_{get,set}_lowres(avctx)
3346  */
3347  int lowres;
3348 #endif
3349 
3350  /**
3351  * Current statistics for PTS correction.
3352  * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3353  * - encoding: unused
3354  */
3355  int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3356  int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3357  int64_t pts_correction_last_pts; /// PTS of the last frame
3358  int64_t pts_correction_last_dts; /// DTS of the last frame
3359 
3360  /**
3361  * Character encoding of the input subtitles file.
3362  * - decoding: set by user
3363  * - encoding: unused
3364  */
3366 
3367  /**
3368  * Subtitles character encoding mode. Formats or codecs might be adjusting
3369  * this setting (if they are doing the conversion themselves for instance).
3370  * - decoding: set by libavcodec
3371  * - encoding: unused
3372  */
3374 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3375 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3376 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3377 
3378  /**
3379  * Skip processing alpha if supported by codec.
3380  * Note that if the format uses pre-multiplied alpha (common with VP6,
3381  * and recommended due to better video quality/compression)
3382  * the image will look as if alpha-blended onto a black background.
3383  * However for formats that do not use pre-multiplied alpha
3384  * there might be serious artefacts (though e.g. libswscale currently
3385  * assumes pre-multiplied alpha anyway).
3386  * Code outside libavcodec should access this field using AVOptions
3387  *
3388  * - decoding: set by user
3389  * - encoding: unused
3390  */
3392 
3393  /**
3394  * Number of samples to skip after a discontinuity
3395  * - decoding: unused
3396  * - encoding: set by libavcodec
3397  */
3399 
3400 #if !FF_API_DEBUG_MV
3401  /**
3402  * debug motion vectors
3403  * Code outside libavcodec should access this field using AVOptions
3404  * - encoding: Set by user.
3405  * - decoding: Set by user.
3406  */
3407  int debug_mv;
3408 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3409 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3410 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3411 #endif
3412 
3413  /**
3414  * custom intra quantization matrix
3415  * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3416  * - encoding: Set by user, can be NULL.
3417  * - decoding: unused.
3418  */
3420 
3421  /**
3422  * dump format separator.
3423  * can be ", " or "\n " or anything else
3424  * Code outside libavcodec should access this field using AVOptions
3425  * (NO direct access).
3426  * - encoding: Set by user.
3427  * - decoding: Set by user.
3428  */
3429  uint8_t *dump_separator;
3430 
3431  /**
3432  * ',' separated list of allowed decoders.
3433  * If NULL then all are allowed
3434  * - encoding: unused
3435  * - decoding: set by user through AVOPtions (NO direct access)
3436  */
3438 
3439  /*
3440  * Properties of the stream that gets decoded
3441  * To be accessed through av_codec_get_properties() (NO direct access)
3442  * - encoding: unused
3443  * - decoding: set by libavcodec
3444  */
3445  unsigned properties;
3446 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3447 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3448 } AVCodecContext;
3449 
3452 
3455 
3456 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3457 
3458 int av_codec_get_lowres(const AVCodecContext *avctx);
3459 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3460 
3461 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3462 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3463 
3464 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3465 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3466 
3467 /**
3468  * AVProfile.
3469  */
3470 typedef struct AVProfile {
3471  int profile;
3472  const char *name; ///< short name for the profile
3473 } AVProfile;
3474 
3476 
3477 struct AVSubtitle;
3478 
3479 /**
3480  * AVCodec.
3481  */
3482 typedef struct AVCodec {
3483  /**
3484  * Name of the codec implementation.
3485  * The name is globally unique among encoders and among decoders (but an
3486  * encoder and a decoder can share the same name).
3487  * This is the primary way to find a codec from the user perspective.
3488  */
3489  const char *name;
3490  /**
3491  * Descriptive name for the codec, meant to be more human readable than name.
3492  * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3493  */
3494  const char *long_name;
3497  /**
3498  * Codec capabilities.
3499  * see AV_CODEC_CAP_*
3500  */
3502  const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3503  const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3504  const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3505  const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3506  const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3507  uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3508  const AVClass *priv_class; ///< AVClass for the private context
3509  const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3510 
3511  /*****************************************************************
3512  * No fields below this line are part of the public API. They
3513  * may not be used outside of libavcodec and can be changed and
3514  * removed at will.
3515  * New public fields should be added right above.
3516  *****************************************************************
3517  */
3519  struct AVCodec *next;
3520  /**
3521  * @name Frame-level threading support functions
3522  * @{
3523  */
3524  /**
3525  * If defined, called on thread contexts when they are created.
3526  * If the codec allocates writable tables in init(), re-allocate them here.
3527  * priv_data will be set to a copy of the original.
3528  */
3530  /**
3531  * Copy necessary context variables from a previous thread context to the current one.
3532  * If not defined, the next thread will start automatically; otherwise, the codec
3533  * must call ff_thread_finish_setup().
3534  *
3535  * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3536  */
3538  /** @} */
3539 
3540  /**
3541  * Private codec-specific defaults.
3542  */
3544 
3545  /**
3546  * Initialize codec static data, called from avcodec_register().
3547  */
3548  void (*init_static_data)(struct AVCodec *codec);
3549 
3551  int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3552  const struct AVSubtitle *sub);
3553  /**
3554  * Encode data to an AVPacket.
3555  *
3556  * @param avctx codec context
3557  * @param avpkt output AVPacket (may contain a user-provided buffer)
3558  * @param[in] frame AVFrame containing the raw data to be encoded
3559  * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3560  * non-empty packet was returned in avpkt.
3561  * @return 0 on success, negative error code on failure
3562  */
3563  int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3564  int *got_packet_ptr);
3565  int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3566  int (*close)(AVCodecContext *);
3567  /**
3568  * Flush buffers.
3569  * Will be called when seeking
3570  */
3571  void (*flush)(AVCodecContext *);
3572  /**
3573  * Internal codec capabilities.
3574  * See FF_CODEC_CAP_* in internal.h
3575  */
3577 } AVCodec;
3578 
3579 int av_codec_get_max_lowres(const AVCodec *codec);
3580 
3581 struct MpegEncContext;
3582 
3583 /**
3584  * @defgroup lavc_hwaccel AVHWAccel
3585  * @{
3586  */
3587 typedef struct AVHWAccel {
3588  /**
3589  * Name of the hardware accelerated codec.
3590  * The name is globally unique among encoders and among decoders (but an
3591  * encoder and a decoder can share the same name).
3592  */
3593  const char *name;
3594 
3595  /**
3596  * Type of codec implemented by the hardware accelerator.
3597  *
3598  * See AVMEDIA_TYPE_xxx
3599  */
3601 
3602  /**
3603  * Codec implemented by the hardware accelerator.
3604  *
3605  * See AV_CODEC_ID_xxx
3606  */
3608 
3609  /**
3610  * Supported pixel format.
3611  *
3612  * Only hardware accelerated formats are supported here.
3613  */
3615 
3616  /**
3617  * Hardware accelerated codec capabilities.
3618  * see HWACCEL_CODEC_CAP_*
3619  */
3621 
3622  /*****************************************************************
3623  * No fields below this line are part of the public API. They
3624  * may not be used outside of libavcodec and can be changed and
3625  * removed at will.
3626  * New public fields should be added right above.
3627  *****************************************************************
3628  */
3629  struct AVHWAccel *next;
3630 
3631  /**
3632  * Allocate a custom buffer
3633  */
3635 
3636  /**
3637  * Called at the beginning of each frame or field picture.
3638  *
3639  * Meaningful frame information (codec specific) is guaranteed to
3640  * be parsed at this point. This function is mandatory.
3641  *
3642  * Note that buf can be NULL along with buf_size set to 0.
3643  * Otherwise, this means the whole frame is available at this point.
3644  *
3645  * @param avctx the codec context
3646  * @param buf the frame data buffer base
3647  * @param buf_size the size of the frame in bytes
3648  * @return zero if successful, a negative value otherwise
3649  */
3650  int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3651 
3652  /**
3653  * Callback for each slice.
3654  *
3655  * Meaningful slice information (codec specific) is guaranteed to
3656  * be parsed at this point. This function is mandatory.
3657  * The only exception is XvMC, that works on MB level.
3658  *
3659  * @param avctx the codec context
3660  * @param buf the slice data buffer base
3661  * @param buf_size the size of the slice in bytes
3662  * @return zero if successful, a negative value otherwise
3663  */
3664  int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3665 
3666  /**
3667  * Called at the end of each frame or field picture.
3668  *
3669  * The whole picture is parsed at this point and can now be sent
3670  * to the hardware accelerator. This function is mandatory.
3671  *
3672  * @param avctx the codec context
3673  * @return zero if successful, a negative value otherwise
3674  */
3675  int (*end_frame)(AVCodecContext *avctx);
3676 
3677  /**
3678  * Size of per-frame hardware accelerator private data.
3679  *
3680  * Private data is allocated with av_mallocz() before
3681  * AVCodecContext.get_buffer() and deallocated after
3682  * AVCodecContext.release_buffer().
3683  */
3685 
3686  /**
3687  * Called for every Macroblock in a slice.
3688  *
3689  * XvMC uses it to replace the ff_mpv_decode_mb().
3690  * Instead of decoding to raw picture, MB parameters are
3691  * stored in an array provided by the video driver.
3692  *
3693  * @param s the mpeg context
3694  */
3695  void (*decode_mb)(struct MpegEncContext *s);
3696 
3697  /**
3698  * Initialize the hwaccel private data.
3699  *
3700  * This will be called from ff_get_format(), after hwaccel and
3701  * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3702  * is allocated.
3703  */
3704  int (*init)(AVCodecContext *avctx);
3705 
3706  /**
3707  * Uninitialize the hwaccel private data.
3708  *
3709  * This will be called from get_format() or avcodec_close(), after hwaccel
3710  * and hwaccel_context are already uninitialized.
3711  */
3712  int (*uninit)(AVCodecContext *avctx);
3713 
3714  /**
3715  * Size of the private data to allocate in
3716  * AVCodecInternal.hwaccel_priv_data.
3717  */
3719 } AVHWAccel;
3720 
3721 /**
3722  * Hardware acceleration should be used for decoding even if the codec level
3723  * used is unknown or higher than the maximum supported level reported by the
3724  * hardware driver.
3725  *
3726  * It's generally a good idea to pass this flag unless you have a specific
3727  * reason not to, as hardware tends to under-report supported levels.
3728  */
3729 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3730 
3731 /**
3732  * Hardware acceleration can output YUV pixel formats with a different chroma
3733  * sampling than 4:2:0 and/or other than 8 bits per component.
3734  */
3735 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3736 
3737 /**
3738  * @}
3739  */
3740 
3741 /**
3742  * @defgroup lavc_picture AVPicture
3743  *
3744  * Functions for working with AVPicture
3745  * @{
3746  */
3747 
3748 /**
3749  * Picture data structure.
3750  *
3751  * Up to four components can be stored into it, the last component is
3752  * alpha.
3753  */
3754 typedef struct AVPicture {
3755  uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3756  int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3757 } AVPicture;
3758 
3759 /**
3760  * @}
3761  */
3762 
3765 
3766  SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3767 
3768  /**
3769  * Plain text, the text field must be set by the decoder and is
3770  * authoritative. ass and pict fields may contain approximations.
3771  */
3773 
3774  /**
3775  * Formatted text, the ass field must be set by the decoder and is
3776  * authoritative. pict and text fields may contain approximations.
3777  */
3779 };
3780 
3781 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3782 
3783 typedef struct AVSubtitleRect {
3784  int x; ///< top left corner of pict, undefined when pict is not set
3785  int y; ///< top left corner of pict, undefined when pict is not set
3786  int w; ///< width of pict, undefined when pict is not set
3787  int h; ///< height of pict, undefined when pict is not set
3788  int nb_colors; ///< number of colors in pict, undefined when pict is not set
3789 
3790  /**
3791  * data+linesize for the bitmap of this subtitle.
3792  * can be set for text/ass as well once they are rendered
3793  */
3796 
3797  char *text; ///< 0 terminated plain UTF-8 text
3798 
3799  /**
3800  * 0 terminated ASS/SSA compatible event line.
3801  * The presentation of this is unaffected by the other values in this
3802  * struct.
3803  */
3804  char *ass;
3805 
3806  int flags;
3807 } AVSubtitleRect;
3808 
3809 typedef struct AVSubtitle {
3810  uint16_t format; /* 0 = graphics */
3811  uint32_t start_display_time; /* relative to packet pts, in ms */
3812  uint32_t end_display_time; /* relative to packet pts, in ms */
3813  unsigned num_rects;
3815  int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3816 } AVSubtitle;
3817 
3818 /**
3819  * If c is NULL, returns the first registered codec,
3820  * if c is non-NULL, returns the next registered codec after c,
3821  * or NULL if c is the last one.
3822  */
3823 AVCodec *av_codec_next(const AVCodec *c);
3824 
3825 /**
3826  * Return the LIBAVCODEC_VERSION_INT constant.
3827  */
3828 unsigned avcodec_version(void);
3829 
3830 /**
3831  * Return the libavcodec build-time configuration.
3832  */
3833 const char *avcodec_configuration(void);
3834 
3835 /**
3836  * Return the libavcodec license.
3837  */
3838 const char *avcodec_license(void);
3839 
3840 /**
3841  * Register the codec codec and initialize libavcodec.
3842  *
3843  * @warning either this function or avcodec_register_all() must be called
3844  * before any other libavcodec functions.
3845  *
3846  * @see avcodec_register_all()
3847  */
3848 void avcodec_register(AVCodec *codec);
3849 
3850 /**
3851  * Register all the codecs, parsers and bitstream filters which were enabled at
3852  * configuration time. If you do not call this function you can select exactly
3853  * which formats you want to support, by using the individual registration
3854  * functions.
3855  *
3856  * @see avcodec_register
3857  * @see av_register_codec_parser
3858  * @see av_register_bitstream_filter
3859  */
3860 void avcodec_register_all(void);
3861 
3862 /**
3863  * Allocate an AVCodecContext and set its fields to default values. The
3864  * resulting struct should be freed with avcodec_free_context().
3865  *
3866  * @param codec if non-NULL, allocate private data and initialize defaults
3867  * for the given codec. It is illegal to then call avcodec_open2()
3868  * with a different codec.
3869  * If NULL, then the codec-specific defaults won't be initialized,
3870  * which may result in suboptimal default settings (this is
3871  * important mainly for encoders, e.g. libx264).
3872  *
3873  * @return An AVCodecContext filled with default values or NULL on failure.
3874  * @see avcodec_get_context_defaults
3875  */
3877 
3878 /**
3879  * Free the codec context and everything associated with it and write NULL to
3880  * the provided pointer.
3881  */
3882 void avcodec_free_context(AVCodecContext **avctx);
3883 
3884 /**
3885  * Set the fields of the given AVCodecContext to default values corresponding
3886  * to the given codec (defaults may be codec-dependent).
3887  *
3888  * Do not call this function if a non-NULL codec has been passed
3889  * to avcodec_alloc_context3() that allocated this AVCodecContext.
3890  * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3891  * different codec on this AVCodecContext.
3892  */
3894 
3895 /**
3896  * Get the AVClass for AVCodecContext. It can be used in combination with
3897  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3898  *
3899  * @see av_opt_find().
3900  */
3901 const AVClass *avcodec_get_class(void);
3902 
3903 /**
3904  * Get the AVClass for AVFrame. It can be used in combination with
3905  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3906  *
3907  * @see av_opt_find().
3908  */
3909 const AVClass *avcodec_get_frame_class(void);
3910 
3911 /**
3912  * Get the AVClass for AVSubtitleRect. It can be used in combination with
3913  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3914  *
3915  * @see av_opt_find().
3916  */
3918 
3919 /**
3920  * Copy the settings of the source AVCodecContext into the destination
3921  * AVCodecContext. The resulting destination codec context will be
3922  * unopened, i.e. you are required to call avcodec_open2() before you
3923  * can use this AVCodecContext to decode/encode video/audio data.
3924  *
3925  * @param dest target codec context, should be initialized with
3926  * avcodec_alloc_context3(NULL), but otherwise uninitialized
3927  * @param src source codec context
3928  * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3929  */
3930 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3931 
3932 #if FF_API_AVFRAME_LAVC
3933 /**
3934  * @deprecated use av_frame_alloc()
3935  */
3937 AVFrame *avcodec_alloc_frame(void);
3938 
3939 /**
3940  * Set the fields of the given AVFrame to default values.
3941  *
3942  * @param frame The AVFrame of which the fields should be set to default values.
3943  *
3944  * @deprecated use av_frame_unref()
3945  */
3947 void avcodec_get_frame_defaults(AVFrame *frame);
3948 
3949 /**
3950  * Free the frame and any dynamically allocated objects in it,
3951  * e.g. extended_data.
3952  *
3953  * @param frame frame to be freed. The pointer will be set to NULL.
3954  *
3955  * @warning this function does NOT free the data buffers themselves
3956  * (it does not know how, since they might have been allocated with
3957  * a custom get_buffer()).
3958  *
3959  * @deprecated use av_frame_free()
3960  */
3962 void avcodec_free_frame(AVFrame **frame);
3963 #endif
3964 
3965 /**
3966  * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3967  * function the context has to be allocated with avcodec_alloc_context3().
3968  *
3969  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3970  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3971  * retrieving a codec.
3972  *
3973  * @warning This function is not thread safe!
3974  *
3975  * @note Always call this function before using decoding routines (such as
3976  * @ref avcodec_decode_video2()).
3977  *
3978  * @code
3979  * avcodec_register_all();
3980  * av_dict_set(&opts, "b", "2.5M", 0);
3981  * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3982  * if (!codec)
3983  * exit(1);
3984  *
3985  * context = avcodec_alloc_context3(codec);
3986  *
3987  * if (avcodec_open2(context, codec, opts) < 0)
3988  * exit(1);
3989  * @endcode
3990  *
3991  * @param avctx The context to initialize.
3992  * @param codec The codec to open this context for. If a non-NULL codec has been
3993  * previously passed to avcodec_alloc_context3() or
3994  * avcodec_get_context_defaults3() for this context, then this
3995  * parameter MUST be either NULL or equal to the previously passed
3996  * codec.
3997  * @param options A dictionary filled with AVCodecContext and codec-private options.
3998  * On return this object will be filled with options that were not found.
3999  *
4000  * @return zero on success, a negative value on error
4001  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4002  * av_dict_set(), av_opt_find().
4003  */
4004 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4005 
4006 /**
4007  * Close a given AVCodecContext and free all the data associated with it
4008  * (but not the AVCodecContext itself).
4009  *
4010  * Calling this function on an AVCodecContext that hasn't been opened will free
4011  * the codec-specific data allocated in avcodec_alloc_context3() /
4012  * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
4013  * do nothing.
4014  */
4015 int avcodec_close(AVCodecContext *avctx);
4016 
4017 /**
4018  * Free all allocated data in the given subtitle struct.
4019  *
4020  * @param sub AVSubtitle to free.
4021  */
4022 void avsubtitle_free(AVSubtitle *sub);
4023 
4024 /**
4025  * @}
4026  */
4027 
4028 /**
4029  * @addtogroup lavc_packet
4030  * @{
4031  */
4032 
4033 #if FF_API_DESTRUCT_PACKET
4034 /**
4035  * Default packet destructor.
4036  * @deprecated use the AVBuffer API instead
4037  */
4040 #endif
4041 
4042 /**
4043  * Initialize optional fields of a packet with default values.
4044  *
4045  * Note, this does not touch the data and size members, which have to be
4046  * initialized separately.
4047  *
4048  * @param pkt packet
4049  */
4050 void av_init_packet(AVPacket *pkt);
4051 
4052 /**
4053  * Allocate the payload of a packet and initialize its fields with
4054  * default values.
4055  *
4056  * @param pkt packet
4057  * @param size wanted payload size
4058  * @return 0 if OK, AVERROR_xxx otherwise
4059  */
4060 int av_new_packet(AVPacket *pkt, int size);
4061 
4062 /**
4063  * Reduce packet size, correctly zeroing padding
4064  *
4065  * @param pkt packet
4066  * @param size new size
4067  */
4068 void av_shrink_packet(AVPacket *pkt, int size);
4069 
4070 /**
4071  * Increase packet size, correctly zeroing padding
4072  *
4073  * @param pkt packet
4074  * @param grow_by number of bytes by which to increase the size of the packet
4075  */
4076 int av_grow_packet(AVPacket *pkt, int grow_by);
4077 
4078 /**
4079  * Initialize a reference-counted packet from av_malloc()ed data.
4080  *
4081  * @param pkt packet to be initialized. This function will set the data, size,
4082  * buf and destruct fields, all others are left untouched.
4083  * @param data Data allocated by av_malloc() to be used as packet data. If this
4084  * function returns successfully, the data is owned by the underlying AVBuffer.
4085  * The caller may not access the data through other means.
4086  * @param size size of data in bytes, without the padding. I.e. the full buffer
4087  * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4088  *
4089  * @return 0 on success, a negative AVERROR on error
4090  */
4091 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4092 
4093 /**
4094  * @warning This is a hack - the packet memory allocation stuff is broken. The
4095  * packet is allocated if it was not really allocated.
4096  */
4097 int av_dup_packet(AVPacket *pkt);
4098 
4099 /**
4100  * Copy packet, including contents
4101  *
4102  * @return 0 on success, negative AVERROR on fail
4103  */
4104 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4105 
4106 /**
4107  * Copy packet side data
4108  *
4109  * @return 0 on success, negative AVERROR on fail
4110  */
4111 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4112 
4113 /**
4114  * Free a packet.
4115  *
4116  * @param pkt packet to free
4117  */
4118 void av_free_packet(AVPacket *pkt);
4119 
4120 /**
4121  * Allocate new information of a packet.
4122  *
4123  * @param pkt packet
4124  * @param type side information type
4125  * @param size side information size
4126  * @return pointer to fresh allocated data or NULL otherwise
4127  */
4129  int size);
4130 
4131 /**
4132  * Shrink the already allocated side data buffer
4133  *
4134  * @param pkt packet
4135  * @param type side information type
4136  * @param size new side information size
4137  * @return 0 on success, < 0 on failure
4138  */
4140  int size);
4141 
4142 /**
4143  * Get side information from packet.
4144  *
4145  * @param pkt packet
4146  * @param type desired side information type
4147  * @param size pointer for side information size to store (optional)
4148  * @return pointer to data if present or NULL otherwise
4149  */
4151  int *size);
4152 
4154 
4156 
4158 
4159 /**
4160  * Pack a dictionary for use in side_data.
4161  *
4162  * @param dict The dictionary to pack.
4163  * @param size pointer to store the size of the returned data
4164  * @return pointer to data if successful, NULL otherwise
4165  */
4166 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4167 /**
4168  * Unpack a dictionary from side_data.
4169  *
4170  * @param data data from side_data
4171  * @param size size of the data
4172  * @param dict the metadata storage dictionary
4173  * @return 0 on success, < 0 on failure
4174  */
4175 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4176 
4177 
4178 /**
4179  * Convenience function to free all the side data stored.
4180  * All the other fields stay untouched.
4181  *
4182  * @param pkt packet
4183  */
4185 
4186 /**
4187  * Setup a new reference to the data described by a given packet
4188  *
4189  * If src is reference-counted, setup dst as a new reference to the
4190  * buffer in src. Otherwise allocate a new buffer in dst and copy the
4191  * data from src into it.
4192  *
4193  * All the other fields are copied from src.
4194  *
4195  * @see av_packet_unref
4196  *
4197  * @param dst Destination packet
4198  * @param src Source packet
4199  *
4200  * @return 0 on success, a negative AVERROR on error.
4201  */
4202 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4203 
4204 /**
4205  * Wipe the packet.
4206  *
4207  * Unreference the buffer referenced by the packet and reset the
4208  * remaining packet fields to their default values.
4209  *
4210  * @param pkt The packet to be unreferenced.
4211  */
4213 
4214 /**
4215  * Move every field in src to dst and reset src.
4216  *
4217  * @see av_packet_unref
4218  *
4219  * @param src Source packet, will be reset
4220  * @param dst Destination packet
4221  */
4222 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4223 
4224 /**
4225  * Copy only "properties" fields from src to dst.
4226  *
4227  * Properties for the purpose of this function are all the fields
4228  * beside those related to the packet data (buf, data, size)
4229  *
4230  * @param dst Destination packet
4231  * @param src Source packet
4232  *
4233  * @return 0 on success AVERROR on failure.
4234  *
4235  */
4236 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4237 
4238 /**
4239  * Convert valid timing fields (timestamps / durations) in a packet from one
4240  * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4241  * ignored.
4242  *
4243  * @param pkt packet on which the conversion will be performed
4244  * @param tb_src source timebase, in which the timing fields in pkt are
4245  * expressed
4246  * @param tb_dst destination timebase, to which the timing fields will be
4247  * converted
4248  */
4249 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4250 
4251 /**
4252  * @}
4253  */
4254 
4255 /**
4256  * @addtogroup lavc_decoding
4257  * @{
4258  */
4259 
4260 /**
4261  * Find a registered decoder with a matching codec ID.
4262  *
4263  * @param id AVCodecID of the requested decoder
4264  * @return A decoder if one was found, NULL otherwise.
4265  */
4267 
4268 /**
4269  * Find a registered decoder with the specified name.
4270  *
4271  * @param name name of the requested decoder
4272  * @return A decoder if one was found, NULL otherwise.
4273  */
4275 
4276 #if FF_API_GET_BUFFER
4280 #endif
4281 
4282 /**
4283  * The default callback for AVCodecContext.get_buffer2(). It is made public so
4284  * it can be called by custom get_buffer2() implementations for decoders without
4285  * AV_CODEC_CAP_DR1 set.
4286  */
4288 
4289 #if FF_API_EMU_EDGE
4290 /**
4291  * Return the amount of padding in pixels which the get_buffer callback must
4292  * provide around the edge of the image for codecs which do not have the
4293  * CODEC_FLAG_EMU_EDGE flag.
4294  *
4295  * @return Required padding in pixels.
4296  *
4297  * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4298  * needed
4299  */
4301 unsigned avcodec_get_edge_width(void);
4302 #endif
4303 
4304 /**
4305  * Modify width and height values so that they will result in a memory
4306  * buffer that is acceptable for the codec if you do not use any horizontal
4307  * padding.
4308  *
4309  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4310  */
4312 
4313 /**
4314  * Modify width and height values so that they will result in a memory
4315  * buffer that is acceptable for the codec if you also ensure that all
4316  * line sizes are a multiple of the respective linesize_align[i].
4317  *
4318  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4319  */
4321  int linesize_align[AV_NUM_DATA_POINTERS]);
4322 
4323 /**
4324  * Converts AVChromaLocation to swscale x/y chroma position.
4325  *
4326  * The positions represent the chroma (0,0) position in a coordinates system
4327  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4328  *
4329  * @param xpos horizontal chroma sample position
4330  * @param ypos vertical chroma sample position
4331  */
4332 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4333 
4334 /**
4335  * Converts swscale x/y chroma position to AVChromaLocation.
4336  *
4337  * The positions represent the chroma (0,0) position in a coordinates system
4338  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4339  *
4340  * @param xpos horizontal chroma sample position
4341  * @param ypos vertical chroma sample position
4342  */
4343 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4344 
4345 #if FF_API_OLD_DECODE_AUDIO
4346 /**
4347  * Wrapper function which calls avcodec_decode_audio4.
4348  *
4349  * @deprecated Use avcodec_decode_audio4 instead.
4350  *
4351  * Decode the audio frame of size avpkt->size from avpkt->data into samples.
4352  * Some decoders may support multiple frames in a single AVPacket, such
4353  * decoders would then just decode the first frame. In this case,
4354  * avcodec_decode_audio3 has to be called again with an AVPacket that contains
4355  * the remaining data in order to decode the second frame etc.
4356  * If no frame
4357  * could be outputted, frame_size_ptr is zero. Otherwise, it is the
4358  * decompressed frame size in bytes.
4359  *
4360  * @warning You must set frame_size_ptr to the allocated size of the
4361  * output buffer before calling avcodec_decode_audio3().
4362  *
4363  * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4364  * the actual read bytes because some optimized bitstream readers read 32 or 64
4365  * bits at once and could read over the end.
4366  *
4367  * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
4368  * no overreading happens for damaged MPEG streams.
4369  *
4370  * @warning You must not provide a custom get_buffer() when using
4371  * avcodec_decode_audio3(). Doing so will override it with
4372  * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
4373  * which does allow the application to provide a custom get_buffer().
4374  *
4375  * @note You might have to align the input buffer avpkt->data and output buffer
4376  * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
4377  * necessary at all, on others it won't work at all if not aligned and on others
4378  * it will work but it will have an impact on performance.
4379  *
4380  * In practice, avpkt->data should have 4 byte alignment at minimum and
4381  * samples should be 16 byte aligned unless the CPU doesn't need it
4382  * (AltiVec and SSE do).
4383  *
4384  * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4385  * between input and output, these need to be fed with avpkt->data=NULL,
4386  * avpkt->size=0 at the end to return the remaining frames.
4387  *
4388  * @param avctx the codec context
4389  * @param[out] samples the output buffer, sample type in avctx->sample_fmt
4390  * If the sample format is planar, each channel plane will
4391  * be the same size, with no padding between channels.
4392  * @param[in,out] frame_size_ptr the output buffer size in bytes
4393  * @param[in] avpkt The input AVPacket containing the input buffer.
4394  * You can create such packet with av_init_packet() and by then setting
4395  * data and size, some decoders might in addition need other fields.
4396  * All decoders are designed to use the least fields possible though.
4397  * @return On error a negative value is returned, otherwise the number of bytes
4398  * used or zero if no frame data was decompressed (used) from the input AVPacket.
4399  */
4400 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
4401  int *frame_size_ptr,
4402  AVPacket *avpkt);
4403 #endif
4404 
4405 /**
4406  * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4407  *
4408  * Some decoders may support multiple frames in a single AVPacket. Such
4409  * decoders would then just decode the first frame and the return value would be
4410  * less than the packet size. In this case, avcodec_decode_audio4 has to be
4411  * called again with an AVPacket containing the remaining data in order to
4412  * decode the second frame, etc... Even if no frames are returned, the packet
4413  * needs to be fed to the decoder with remaining data until it is completely
4414  * consumed or an error occurs.
4415  *
4416  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4417  * and output. This means that for some packets they will not immediately
4418  * produce decoded output and need to be flushed at the end of decoding to get
4419  * all the decoded data. Flushing is done by calling this function with packets
4420  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4421  * returning samples. It is safe to flush even those decoders that are not
4422  * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4423  *
4424  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4425  * larger than the actual read bytes because some optimized bitstream
4426  * readers read 32 or 64 bits at once and could read over the end.
4427  *
4428  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4429  * before packets may be fed to the decoder.
4430  *
4431  * @param avctx the codec context
4432  * @param[out] frame The AVFrame in which to store decoded audio samples.
4433  * The decoder will allocate a buffer for the decoded frame by
4434  * calling the AVCodecContext.get_buffer2() callback.
4435  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4436  * reference counted and the returned reference belongs to the
4437  * caller. The caller must release the frame using av_frame_unref()
4438  * when the frame is no longer needed. The caller may safely write
4439  * to the frame if av_frame_is_writable() returns 1.
4440  * When AVCodecContext.refcounted_frames is set to 0, the returned
4441  * reference belongs to the decoder and is valid only until the
4442  * next call to this function or until closing or flushing the
4443  * decoder. The caller may not write to it.
4444  * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4445  * non-zero. Note that this field being set to zero
4446  * does not mean that an error has occurred. For
4447  * decoders with AV_CODEC_CAP_DELAY set, no given decode
4448  * call is guaranteed to produce a frame.
4449  * @param[in] avpkt The input AVPacket containing the input buffer.
4450  * At least avpkt->data and avpkt->size should be set. Some
4451  * decoders might also require additional fields to be set.
4452  * @return A negative error code is returned if an error occurred during
4453  * decoding, otherwise the number of bytes consumed from the input
4454  * AVPacket is returned.
4455  */
4457  int *got_frame_ptr, const AVPacket *avpkt);
4458 
4459 /**
4460  * Decode the video frame of size avpkt->size from avpkt->data into picture.
4461  * Some decoders may support multiple frames in a single AVPacket, such
4462  * decoders would then just decode the first frame.
4463  *
4464  * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4465  * the actual read bytes because some optimized bitstream readers read 32 or 64
4466  * bits at once and could read over the end.
4467  *
4468  * @warning The end of the input buffer buf should be set to 0 to ensure that
4469  * no overreading happens for damaged MPEG streams.
4470  *
4471  * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4472  * between input and output, these need to be fed with avpkt->data=NULL,
4473  * avpkt->size=0 at the end to return the remaining frames.
4474  *
4475  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4476  * before packets may be fed to the decoder.
4477  *
4478  * @param avctx the codec context
4479  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4480  * Use av_frame_alloc() to get an AVFrame. The codec will
4481  * allocate memory for the actual bitmap by calling the
4482  * AVCodecContext.get_buffer2() callback.
4483  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4484  * reference counted and the returned reference belongs to the
4485  * caller. The caller must release the frame using av_frame_unref()
4486  * when the frame is no longer needed. The caller may safely write
4487  * to the frame if av_frame_is_writable() returns 1.
4488  * When AVCodecContext.refcounted_frames is set to 0, the returned
4489  * reference belongs to the decoder and is valid only until the
4490  * next call to this function or until closing or flushing the
4491  * decoder. The caller may not write to it.
4492  *
4493  * @param[in] avpkt The input AVPacket containing the input buffer.
4494  * You can create such packet with av_init_packet() and by then setting
4495  * data and size, some decoders might in addition need other fields like
4496  * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4497  * fields possible.
4498  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4499  * @return On error a negative value is returned, otherwise the number of bytes
4500  * used or zero if no frame could be decompressed.
4501  */
4502 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4503  int *got_picture_ptr,
4504  const AVPacket *avpkt);
4505 
4506 /**
4507  * Decode a subtitle message.
4508  * Return a negative value on error, otherwise return the number of bytes used.
4509  * If no subtitle could be decompressed, got_sub_ptr is zero.
4510  * Otherwise, the subtitle is stored in *sub.
4511  * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4512  * simplicity, because the performance difference is expect to be negligible
4513  * and reusing a get_buffer written for video codecs would probably perform badly
4514  * due to a potentially very different allocation pattern.
4515  *
4516  * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4517  * and output. This means that for some packets they will not immediately
4518  * produce decoded output and need to be flushed at the end of decoding to get
4519  * all the decoded data. Flushing is done by calling this function with packets
4520  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4521  * returning subtitles. It is safe to flush even those decoders that are not
4522  * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4523  *
4524  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4525  * before packets may be fed to the decoder.
4526  *
4527  * @param avctx the codec context
4528  * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4529  * must be freed with avsubtitle_free if *got_sub_ptr is set.
4530  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4531  * @param[in] avpkt The input AVPacket containing the input buffer.
4532  */
4534  int *got_sub_ptr,
4535  AVPacket *avpkt);
4536 
4537 /**
4538  * @defgroup lavc_parsing Frame parsing
4539  * @{
4540  */
4541 
4544  AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4545  AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4546  AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4547 };
4548 
4549 typedef struct AVCodecParserContext {
4550  void *priv_data;
4552  int64_t frame_offset; /* offset of the current frame */
4553  int64_t cur_offset; /* current offset
4554  (incremented by each av_parser_parse()) */
4555  int64_t next_frame_offset; /* offset of the next frame */
4556  /* video info */
4557  int pict_type; /* XXX: Put it back in AVCodecContext. */
4558  /**
4559  * This field is used for proper frame duration computation in lavf.
4560  * It signals, how much longer the frame duration of the current frame
4561  * is compared to normal frame duration.
4562  *
4563  * frame_duration = (1 + repeat_pict) * time_base
4564  *
4565  * It is used by codecs like H.264 to display telecined material.
4566  */
4567  int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4568  int64_t pts; /* pts of the current frame */
4569  int64_t dts; /* dts of the current frame */
4570 
4571  /* private data */
4572  int64_t last_pts;
4573  int64_t last_dts;
4575 
4576 #define AV_PARSER_PTS_NB 4
4578  int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4579  int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4580  int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4581 
4582  int flags;
4583 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4584 #define PARSER_FLAG_ONCE 0x0002
4585 /// Set if the parser has a valid file offset
4586 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4587 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4588 
4589  int64_t offset; ///< byte offset from starting packet start
4590  int64_t cur_frame_end[AV_PARSER_PTS_NB];
4591 
4592  /**
4593  * Set by parser to 1 for key frames and 0 for non-key frames.
4594  * It is initialized to -1, so if the parser doesn't set this flag,
4595  * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4596  * will be used.
4597  */
4599 
4600  /**
4601  * Time difference in stream time base units from the pts of this
4602  * packet to the point at which the output from the decoder has converged
4603  * independent from the availability of previous frames. That is, the
4604  * frames are virtually identical no matter if decoding started from
4605  * the very first frame or from this keyframe.
4606  * Is AV_NOPTS_VALUE if unknown.
4607  * This field is not the display duration of the current frame.
4608  * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4609  * set.
4610  *
4611  * The purpose of this field is to allow seeking in streams that have no
4612  * keyframes in the conventional sense. It corresponds to the
4613  * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4614  * essential for some types of subtitle streams to ensure that all
4615  * subtitles are correctly displayed after seeking.
4616  */
4618 
4619  // Timestamp generation support:
4620  /**
4621  * Synchronization point for start of timestamp generation.
4622  *
4623  * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4624  * (default).
4625  *
4626  * For example, this corresponds to presence of H.264 buffering period
4627  * SEI message.
4628  */
4630 
4631  /**
4632  * Offset of the current timestamp against last timestamp sync point in
4633  * units of AVCodecContext.time_base.
4634  *
4635  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4636  * contain a valid timestamp offset.
4637  *
4638  * Note that the timestamp of sync point has usually a nonzero
4639  * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4640  * the next frame after timestamp sync point will be usually 1.
4641  *
4642  * For example, this corresponds to H.264 cpb_removal_delay.
4643  */
4645 
4646  /**
4647  * Presentation delay of current frame in units of AVCodecContext.time_base.
4648  *
4649  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4650  * contain valid non-negative timestamp delta (presentation time of a frame
4651  * must not lie in the past).
4652  *
4653  * This delay represents the difference between decoding and presentation
4654  * time of the frame.
4655  *
4656  * For example, this corresponds to H.264 dpb_output_delay.
4657  */
4659 
4660  /**
4661  * Position of the packet in file.
4662  *
4663  * Analogous to cur_frame_pts/dts
4664  */
4665  int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4666 
4667  /**
4668  * Byte position of currently parsed frame in stream.
4669  */
4670  int64_t pos;
4671 
4672  /**
4673  * Previous frame byte position.
4674  */
4675  int64_t last_pos;
4676 
4677  /**
4678  * Duration of the current frame.
4679  * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4680  * For all other types, this is in units of AVCodecContext.time_base.
4681  */
4683 
4684  enum AVFieldOrder field_order;
4685 
4686  /**
4687  * Indicate whether a picture is coded as a frame, top field or bottom field.
4688  *
4689  * For example, H.264 field_pic_flag equal to 0 corresponds to
4690  * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4691  * equal to 1 and bottom_field_flag equal to 0 corresponds to
4692  * AV_PICTURE_STRUCTURE_TOP_FIELD.
4693  */
4694  enum AVPictureStructure picture_structure;
4695 
4696  /**
4697  * Picture number incremented in presentation or output order.
4698  * This field may be reinitialized at the first picture of a new sequence.
4699  *
4700  * For example, this corresponds to H.264 PicOrderCnt.
4701  */
4703 
4704  /**
4705  * Dimensions of the decoded video intended for presentation.
4706  */
4707  int width;
4708  int height;
4709 
4710  /**
4711  * Dimensions of the coded video.
4712  */
4715 
4716  /**
4717  * The format of the coded data, corresponds to enum AVPixelFormat for video
4718  * and for enum AVSampleFormat for audio.
4719  *
4720  * Note that a decoder can have considerable freedom in how exactly it
4721  * decodes the data, so the format reported here might be different from the
4722  * one returned by a decoder.
4723  */
4724  int format;
4726 
4727 typedef struct AVCodecParser {
4728  int codec_ids[5]; /* several codec IDs are permitted */
4730  int (*parser_init)(AVCodecParserContext *s);
4731  /* This callback never returns an error, a negative value means that
4732  * the frame start was in a previous packet. */
4733  int (*parser_parse)(AVCodecParserContext *s,
4734  AVCodecContext *avctx,
4735  const uint8_t **poutbuf, int *poutbuf_size,
4736  const uint8_t *buf, int buf_size);
4737  void (*parser_close)(AVCodecParserContext *s);
4738  int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4740 } AVCodecParser;
4741 
4743 
4745 AVCodecParserContext *av_parser_init(int codec_id);
4746 
4747 /**
4748  * Parse a packet.
4749  *
4750  * @param s parser context.
4751  * @param avctx codec context.
4752  * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4753  * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4754  * @param buf input buffer.
4755  * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4756  * @param pts input presentation timestamp.
4757  * @param dts input decoding timestamp.
4758  * @param pos input byte position in stream.
4759  * @return the number of bytes of the input bitstream used.
4760  *
4761  * Example:
4762  * @code
4763  * while(in_len){
4764  * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4765  * in_data, in_len,
4766  * pts, dts, pos);
4767  * in_data += len;
4768  * in_len -= len;
4769  *
4770  * if(size)
4771  * decode_frame(data, size);
4772  * }
4773  * @endcode
4774  */
4776  AVCodecContext *avctx,
4777  uint8_t **poutbuf, int *poutbuf_size,
4778  const uint8_t *buf, int buf_size,
4779  int64_t pts, int64_t dts,
4780  int64_t pos);
4781 
4782 /**
4783  * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4784  * @deprecated use AVBitStreamFilter
4785  */
4787  AVCodecContext *avctx,
4788  uint8_t **poutbuf, int *poutbuf_size,
4789  const uint8_t *buf, int buf_size, int keyframe);
4791 
4792 /**
4793  * @}
4794  * @}
4795  */
4796 
4797 /**
4798  * @addtogroup lavc_encoding
4799  * @{
4800  */
4801 
4802 /**
4803  * Find a registered encoder with a matching codec ID.
4804  *
4805  * @param id AVCodecID of the requested encoder
4806  * @return An encoder if one was found, NULL otherwise.
4807  */
4809 
4810 /**
4811  * Find a registered encoder with the specified name.
4812  *
4813  * @param name name of the requested encoder
4814  * @return An encoder if one was found, NULL otherwise.
4815  */
4817 
4818 #if FF_API_OLD_ENCODE_AUDIO
4819 /**
4820  * Encode an audio frame from samples into buf.
4821  *
4822  * @deprecated Use avcodec_encode_audio2 instead.
4823  *
4824  * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4825  * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4826  * will know how much space is needed because it depends on the value passed
4827  * in buf_size as described below. In that case a lower value can be used.
4828  *
4829  * @param avctx the codec context
4830  * @param[out] buf the output buffer
4831  * @param[in] buf_size the output buffer size
4832  * @param[in] samples the input buffer containing the samples
4833  * The number of samples read from this buffer is frame_size*channels,
4834  * both of which are defined in avctx.
4835  * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4836  * samples read from samples is equal to:
4837  * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4838  * This also implies that av_get_bits_per_sample() must not return 0 for these
4839  * codecs.
4840  * @return On error a negative value is returned, on success zero or the number
4841  * of bytes used to encode the data read from the input buffer.
4842  */
4844  uint8_t *buf, int buf_size,
4845  const short *samples);
4846 #endif
4847 
4848 /**
4849  * Encode a frame of audio.
4850  *
4851  * Takes input samples from frame and writes the next output packet, if
4852  * available, to avpkt. The output packet does not necessarily contain data for
4853  * the most recent frame, as encoders can delay, split, and combine input frames
4854  * internally as needed.
4855  *
4856  * @param avctx codec context
4857  * @param avpkt output AVPacket.
4858  * The user can supply an output buffer by setting
4859  * avpkt->data and avpkt->size prior to calling the
4860  * function, but if the size of the user-provided data is not
4861  * large enough, encoding will fail. If avpkt->data and
4862  * avpkt->size are set, avpkt->destruct must also be set. All
4863  * other AVPacket fields will be reset by the encoder using
4864  * av_init_packet(). If avpkt->data is NULL, the encoder will
4865  * allocate it. The encoder will set avpkt->size to the size
4866  * of the output packet.
4867  *
4868  * If this function fails or produces no output, avpkt will be
4869  * freed using av_free_packet() (i.e. avpkt->destruct will be
4870  * called to free the user supplied buffer).
4871  * @param[in] frame AVFrame containing the raw audio data to be encoded.
4872  * May be NULL when flushing an encoder that has the
4873  * AV_CODEC_CAP_DELAY capability set.
4874  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4875  * can have any number of samples.
4876  * If it is not set, frame->nb_samples must be equal to
4877  * avctx->frame_size for all frames except the last.
4878  * The final frame may be smaller than avctx->frame_size.
4879  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4880  * output packet is non-empty, and to 0 if it is
4881  * empty. If the function returns an error, the
4882  * packet can be assumed to be invalid, and the
4883  * value of got_packet_ptr is undefined and should
4884  * not be used.
4885  * @return 0 on success, negative error code on failure
4886  */
4887 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4888  const AVFrame *frame, int *got_packet_ptr);
4889 
4890 #if FF_API_OLD_ENCODE_VIDEO
4891 /**
4892  * @deprecated use avcodec_encode_video2() instead.
4893  *
4894  * Encode a video frame from pict into buf.
4895  * The input picture should be
4896  * stored using a specific format, namely avctx.pix_fmt.
4897  *
4898  * @param avctx the codec context
4899  * @param[out] buf the output buffer for the bitstream of encoded frame
4900  * @param[in] buf_size the size of the output buffer in bytes
4901  * @param[in] pict the input picture to encode
4902  * @return On error a negative value is returned, on success zero or the number
4903  * of bytes used from the output buffer.
4904  */
4906 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4907  const AVFrame *pict);
4908 #endif
4909 
4910 /**
4911  * Encode a frame of video.
4912  *
4913  * Takes input raw video data from frame and writes the next output packet, if
4914  * available, to avpkt. The output packet does not necessarily contain data for
4915  * the most recent frame, as encoders can delay and reorder input frames
4916  * internally as needed.
4917  *
4918  * @param avctx codec context
4919  * @param avpkt output AVPacket.
4920  * The user can supply an output buffer by setting
4921  * avpkt->data and avpkt->size prior to calling the
4922  * function, but if the size of the user-provided data is not
4923  * large enough, encoding will fail. All other AVPacket fields
4924  * will be reset by the encoder using av_init_packet(). If
4925  * avpkt->data is NULL, the encoder will allocate it.
4926  * The encoder will set avpkt->size to the size of the
4927  * output packet. The returned data (if any) belongs to the
4928  * caller, he is responsible for freeing it.
4929  *
4930  * If this function fails or produces no output, avpkt will be
4931  * freed using av_free_packet() (i.e. avpkt->destruct will be
4932  * called to free the user supplied buffer).
4933  * @param[in] frame AVFrame containing the raw video data to be encoded.
4934  * May be NULL when flushing an encoder that has the
4935  * AV_CODEC_CAP_DELAY capability set.
4936  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4937  * output packet is non-empty, and to 0 if it is
4938  * empty. If the function returns an error, the
4939  * packet can be assumed to be invalid, and the
4940  * value of got_packet_ptr is undefined and should
4941  * not be used.
4942  * @return 0 on success, negative error code on failure
4943  */
4944 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4945  const AVFrame *frame, int *got_packet_ptr);
4946 
4947 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4948  const AVSubtitle *sub);
4949 
4950 
4951 /**
4952  * @}
4953  */
4954 
4955 #if FF_API_AVCODEC_RESAMPLE
4956 /**
4957  * @defgroup lavc_resample Audio resampling
4958  * @ingroup libavc
4959  * @deprecated use libswresample instead
4960  *
4961  * @{
4962  */
4963 struct ReSampleContext;
4964 struct AVResampleContext;
4965 
4967 
4968 /**
4969  * Initialize audio resampling context.
4970  *
4971  * @param output_channels number of output channels
4972  * @param input_channels number of input channels
4973  * @param output_rate output sample rate
4974  * @param input_rate input sample rate
4975  * @param sample_fmt_out requested output sample format
4976  * @param sample_fmt_in input sample format
4977  * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4978  * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4979  * @param linear if 1 then the used FIR filter will be linearly interpolated
4980  between the 2 closest, if 0 the closest will be used
4981  * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4982  * @return allocated ReSampleContext, NULL if error occurred
4983  */
4985 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4986  int output_rate, int input_rate,
4987  enum AVSampleFormat sample_fmt_out,
4988  enum AVSampleFormat sample_fmt_in,
4989  int filter_length, int log2_phase_count,
4990  int linear, double cutoff);
4991 
4993 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4994 
4995 /**
4996  * Free resample context.
4997  *
4998  * @param s a non-NULL pointer to a resample context previously
4999  * created with av_audio_resample_init()
5000  */
5003 
5004 
5005 /**
5006  * Initialize an audio resampler.
5007  * Note, if either rate is not an integer then simply scale both rates up so they are.
5008  * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
5009  * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
5010  * @param linear If 1 then the used FIR filter will be linearly interpolated
5011  between the 2 closest, if 0 the closest will be used
5012  * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
5013  */
5015 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
5016 
5017 /**
5018  * Resample an array of samples using a previously configured context.
5019  * @param src an array of unconsumed samples
5020  * @param consumed the number of samples of src which have been consumed are returned here
5021  * @param src_size the number of unconsumed samples available
5022  * @param dst_size the amount of space in samples available in dst
5023  * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
5024  * @return the number of samples written in dst or -1 if an error occurred
5025  */
5027 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
5028 
5029 
5030 /**
5031  * Compensate samplerate/timestamp drift. The compensation is done by changing
5032  * the resampler parameters, so no audible clicks or similar distortions occur
5033  * @param compensation_distance distance in output samples over which the compensation should be performed
5034  * @param sample_delta number of output samples which should be output less
5035  *
5036  * example: av_resample_compensate(c, 10, 500)
5037  * here instead of 510 samples only 500 samples would be output
5038  *
5039  * note, due to rounding the actual compensation might be slightly different,
5040  * especially if the compensation_distance is large and the in_rate used during init is small
5041  */
5043 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
5045 void av_resample_close(struct AVResampleContext *c);
5046 
5047 /**
5048  * @}
5049  */
5050 #endif
5051 
5052 /**
5053  * @addtogroup lavc_picture
5054  * @{
5055  */
5056 
5057 /**
5058  * Allocate memory for the pixels of a picture and setup the AVPicture
5059  * fields for it.
5060  *
5061  * Call avpicture_free() to free it.
5062  *
5063  * @param picture the picture structure to be filled in
5064  * @param pix_fmt the pixel format of the picture
5065  * @param width the width of the picture
5066  * @param height the height of the picture
5067  * @return zero if successful, a negative error code otherwise
5068  *
5069  * @see av_image_alloc(), avpicture_fill()
5070  */
5071 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5072 
5073 /**
5074  * Free a picture previously allocated by avpicture_alloc().
5075  * The data buffer used by the AVPicture is freed, but the AVPicture structure
5076  * itself is not.
5077  *
5078  * @param picture the AVPicture to be freed
5079  */
5080 void avpicture_free(AVPicture *picture);
5081 
5082 /**
5083  * Setup the picture fields based on the specified image parameters
5084  * and the provided image data buffer.
5085  *
5086  * The picture fields are filled in by using the image data buffer
5087  * pointed to by ptr.
5088  *
5089  * If ptr is NULL, the function will fill only the picture linesize
5090  * array and return the required size for the image buffer.
5091  *
5092  * To allocate an image buffer and fill the picture data in one call,
5093  * use avpicture_alloc().
5094  *
5095  * @param picture the picture to be filled in
5096  * @param ptr buffer where the image data is stored, or NULL
5097  * @param pix_fmt the pixel format of the image
5098  * @param width the width of the image in pixels
5099  * @param height the height of the image in pixels
5100  * @return the size in bytes required for src, a negative error code
5101  * in case of failure
5102  *
5103  * @see av_image_fill_arrays()
5104  */
5105 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5106  enum AVPixelFormat pix_fmt, int width, int height);
5107 
5108 /**
5109  * Copy pixel data from an AVPicture into a buffer.
5110  *
5111  * avpicture_get_size() can be used to compute the required size for
5112  * the buffer to fill.
5113  *
5114  * @param src source picture with filled data
5115  * @param pix_fmt picture pixel format
5116  * @param width picture width
5117  * @param height picture height
5118  * @param dest destination buffer
5119  * @param dest_size destination buffer size in bytes
5120  * @return the number of bytes written to dest, or a negative value
5121  * (error code) on error, for example if the destination buffer is not
5122  * big enough
5123  *
5124  * @see av_image_copy_to_buffer()
5125  */
5126 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
5127  int width, int height,
5128  unsigned char *dest, int dest_size);
5129 
5130 /**
5131  * Calculate the size in bytes that a picture of the given width and height
5132  * would occupy if stored in the given picture format.
5133  *
5134  * @param pix_fmt picture pixel format
5135  * @param width picture width
5136  * @param height picture height
5137  * @return the computed picture buffer size or a negative error code
5138  * in case of error
5139  *
5140  * @see av_image_get_buffer_size().
5141  */
5143 
5144 #if FF_API_DEINTERLACE
5145 /**
5146  * deinterlace - if not supported return -1
5147  *
5148  * @deprecated - use yadif (in libavfilter) instead
5149  */
5151 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
5152  enum AVPixelFormat pix_fmt, int width, int height);
5153 #endif
5154 /**
5155  * Copy image src to dst. Wraps av_image_copy().
5156  */
5157 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5158  enum AVPixelFormat pix_fmt, int width, int height);
5159 
5160 /**
5161  * Crop image top and left side.
5162  */
5163 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5164  enum AVPixelFormat pix_fmt, int top_band, int left_band);
5165 
5166 /**
5167  * Pad image.
5168  */
5169 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5170  int padtop, int padbottom, int padleft, int padright, int *color);
5171 
5172 /**
5173  * @}
5174  */
5175 
5176 /**
5177  * @defgroup lavc_misc Utility functions
5178  * @ingroup libavc
5179  *
5180  * Miscellaneous utility functions related to both encoding and decoding
5181  * (or neither).
5182  * @{
5183  */
5184 
5185 /**
5186  * @defgroup lavc_misc_pixfmt Pixel formats
5187  *
5188  * Functions for working with pixel formats.
5189  * @{
5190  */
5191 
5192 /**
5193  * Utility function to access log2_chroma_w log2_chroma_h from
5194  * the pixel format AVPixFmtDescriptor.
5195  *
5196  * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
5197  * for one that returns a failure code and continues in case of invalid
5198  * pix_fmts.
5199  *
5200  * @param[in] pix_fmt the pixel format
5201  * @param[out] h_shift store log2_chroma_w
5202  * @param[out] v_shift store log2_chroma_h
5203  *
5204  * @see av_pix_fmt_get_chroma_sub_sample
5205  */
5206 
5207 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5208 
5209 /**
5210  * Return a value representing the fourCC code associated to the
5211  * pixel format pix_fmt, or 0 if no associated fourCC code can be
5212  * found.
5213  */
5215 
5216 /**
5217  * @deprecated see av_get_pix_fmt_loss()
5218  */
5219 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5220  int has_alpha);
5221 
5222 /**
5223  * Find the best pixel format to convert to given a certain source pixel
5224  * format. When converting from one pixel format to another, information loss
5225  * may occur. For example, when converting from RGB24 to GRAY, the color
5226  * information will be lost. Similarly, other losses occur when converting from
5227  * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5228  * the given pixel formats should be used to suffer the least amount of loss.
5229  * The pixel formats from which it chooses one, are determined by the
5230  * pix_fmt_list parameter.
5231  *
5232  *
5233  * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5234  * @param[in] src_pix_fmt source pixel format
5235  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5236  * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5237  * @return The best pixel format to convert to or -1 if none was found.
5238  */
5239 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5240  enum AVPixelFormat src_pix_fmt,
5241  int has_alpha, int *loss_ptr);
5242 
5243 /**
5244  * @deprecated see av_find_best_pix_fmt_of_2()
5245  */
5246 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5247  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5248 
5250 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
5251 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
5252  enum AVPixelFormat src_pix_fmt,
5253  int has_alpha, int *loss_ptr);
5254 #else
5255 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5256  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5257 #endif
5258 
5259 
5260 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5261 
5262 /**
5263  * @}
5264  */
5265 
5266 #if FF_API_SET_DIMENSIONS
5267 /**
5268  * @deprecated this function is not supposed to be used from outside of lavc
5269  */
5272 #endif
5273 
5274 /**
5275  * Put a string representing the codec tag codec_tag in buf.
5276  *
5277  * @param buf buffer to place codec tag in
5278  * @param buf_size size in bytes of buf
5279  * @param codec_tag codec tag to assign
5280  * @return the length of the string that would have been generated if
5281  * enough space had been available, excluding the trailing null
5282  */
5283 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5284 
5285 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5286 
5287 /**
5288  * Return a name for the specified profile, if available.
5289  *
5290  * @param codec the codec that is searched for the given profile
5291  * @param profile the profile value for which a name is requested
5292  * @return A name for the profile if found, NULL otherwise.
5293  */
5294 const char *av_get_profile_name(const AVCodec *codec, int profile);
5295 
5296 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5297 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5298 //FIXME func typedef
5299 
5300 /**
5301  * Fill AVFrame audio data and linesize pointers.
5302  *
5303  * The buffer buf must be a preallocated buffer with a size big enough
5304  * to contain the specified samples amount. The filled AVFrame data
5305  * pointers will point to this buffer.
5306  *
5307  * AVFrame extended_data channel pointers are allocated if necessary for
5308  * planar audio.
5309  *
5310  * @param frame the AVFrame
5311  * frame->nb_samples must be set prior to calling the
5312  * function. This function fills in frame->data,
5313  * frame->extended_data, frame->linesize[0].
5314  * @param nb_channels channel count
5315  * @param sample_fmt sample format
5316  * @param buf buffer to use for frame data
5317  * @param buf_size size of buffer
5318  * @param align plane size sample alignment (0 = default)
5319  * @return >=0 on success, negative error code on failure
5320  * @todo return the size in bytes required to store the samples in
5321  * case of success, at the next libavutil bump
5322  */
5323 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5324  enum AVSampleFormat sample_fmt, const uint8_t *buf,
5325  int buf_size, int align);
5326 
5327 /**
5328  * Reset the internal decoder state / flush internal buffers. Should be called
5329  * e.g. when seeking or when switching to a different stream.
5330  *
5331  * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5332  * this invalidates the frames previously returned from the decoder. When
5333  * refcounted frames are used, the decoder just releases any references it might
5334  * keep internally, but the caller's reference remains valid.
5335  */
5337 
5338 /**
5339  * Return codec bits per sample.
5340  *
5341  * @param[in] codec_id the codec
5342  * @return Number of bits per sample or zero if unknown for the given codec.
5343  */
5344 int av_get_bits_per_sample(enum AVCodecID codec_id);
5345 
5346 /**
5347  * Return the PCM codec associated with a sample format.
5348  * @param be endianness, 0 for little, 1 for big,
5349  * -1 (or anything else) for native
5350  * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5351  */
5352 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5353 
5354 /**
5355  * Return codec bits per sample.
5356  * Only return non-zero if the bits per sample is exactly correct, not an
5357  * approximation.
5358  *
5359  * @param[in] codec_id the codec
5360  * @return Number of bits per sample or zero if unknown for the given codec.
5361  */
5362 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5363 
5364 /**
5365  * Return audio frame duration.
5366  *
5367  * @param avctx codec context
5368  * @param frame_bytes size of the frame, or 0 if unknown
5369  * @return frame duration, in samples, if known. 0 if not able to
5370  * determine.
5371  */
5372 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5373 
5374 
5376  void *priv_data;
5381 
5382 
5383 typedef struct AVBitStreamFilter {
5384  const char *name;
5386  int (*filter)(AVBitStreamFilterContext *bsfc,
5387  AVCodecContext *avctx, const char *args,
5388  uint8_t **poutbuf, int *poutbuf_size,
5389  const uint8_t *buf, int buf_size, int keyframe);
5390  void (*close)(AVBitStreamFilterContext *bsfc);
5393 
5394 /**
5395  * Register a bitstream filter.
5396  *
5397  * The filter will be accessible to the application code through
5398  * av_bitstream_filter_next() or can be directly initialized with
5399  * av_bitstream_filter_init().
5400  *
5401  * @see avcodec_register_all()
5402  */
5404 
5405 /**
5406  * Create and initialize a bitstream filter context given a bitstream
5407  * filter name.
5408  *
5409  * The returned context must be freed with av_bitstream_filter_close().
5410  *
5411  * @param name the name of the bitstream filter
5412  * @return a bitstream filter context if a matching filter was found
5413  * and successfully initialized, NULL otherwise
5414  */
5416 
5417 /**
5418  * Filter bitstream.
5419  *
5420  * This function filters the buffer buf with size buf_size, and places the
5421  * filtered buffer in the buffer pointed to by poutbuf.
5422  *
5423  * The output buffer must be freed by the caller.
5424  *
5425  * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5426  * @param avctx AVCodecContext accessed by the filter, may be NULL.
5427  * If specified, this must point to the encoder context of the
5428  * output stream the packet is sent to.
5429  * @param args arguments which specify the filter configuration, may be NULL
5430  * @param poutbuf pointer which is updated to point to the filtered buffer
5431  * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5432  * @param buf buffer containing the data to filter
5433  * @param buf_size size in bytes of buf
5434  * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5435  * @return >= 0 in case of success, or a negative error code in case of failure
5436  *
5437  * If the return value is positive, an output buffer is allocated and
5438  * is available in *poutbuf, and is distinct from the input buffer.
5439  *
5440  * If the return value is 0, the output buffer is not allocated and
5441  * should be considered identical to the input buffer, or in case
5442  * *poutbuf was set it points to the input buffer (not necessarily to
5443  * its starting address).
5444  */
5446  AVCodecContext *avctx, const char *args,
5447  uint8_t **poutbuf, int *poutbuf_size,
5448  const uint8_t *buf, int buf_size, int keyframe);
5449 
5450 /**
5451  * Release bitstream filter context.
5452  *
5453  * @param bsf the bitstream filter context created with
5454  * av_bitstream_filter_init(), can be NULL
5455  */
5457 
5458 /**
5459  * If f is NULL, return the first registered bitstream filter,
5460  * if f is non-NULL, return the next registered bitstream filter
5461  * after f, or NULL if f is the last one.
5462  *
5463  * This function can be used to iterate over all registered bitstream
5464  * filters.
5465  */
5467 
5468 /* memory */
5469 
5470 /**
5471  * Same behaviour av_fast_malloc but the buffer has additional
5472  * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5473  *
5474  * In addition the whole buffer will initially and after resizes
5475  * be 0-initialized so that no uninitialized data will ever appear.
5476  */
5477 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5478 
5479 /**
5480  * Same behaviour av_fast_padded_malloc except that buffer will always
5481  * be 0-initialized after call.
5482  */
5483 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5484 
5485 /**
5486  * Encode extradata length to a buffer. Used by xiph codecs.
5487  *
5488  * @param s buffer to write to; must be at least (v/255+1) bytes long
5489  * @param v size of extradata in bytes
5490  * @return number of bytes written to the buffer.
5491  */
5492 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5493 
5494 #if FF_API_MISSING_SAMPLE
5495 /**
5496  * Log a generic warning message about a missing feature. This function is
5497  * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5498  * only, and would normally not be used by applications.
5499  * @param[in] avc a pointer to an arbitrary struct of which the first field is
5500  * a pointer to an AVClass struct
5501  * @param[in] feature string containing the name of the missing feature
5502  * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5503  * If want_sample is non-zero, additional verbage will be added to the log
5504  * message which tells the user how to report samples to the development
5505  * mailing list.
5506  * @deprecated Use avpriv_report_missing_feature() instead.
5507  */
5509 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5510 
5511 /**
5512  * Log a generic warning message asking for a sample. This function is
5513  * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5514  * only, and would normally not be used by applications.
5515  * @param[in] avc a pointer to an arbitrary struct of which the first field is
5516  * a pointer to an AVClass struct
5517  * @param[in] msg string containing an optional message, or NULL if no message
5518  * @deprecated Use avpriv_request_sample() instead.
5519  */
5521 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5522 #endif /* FF_API_MISSING_SAMPLE */
5523 
5524 /**
5525  * Register the hardware accelerator hwaccel.
5526  */
5527 void av_register_hwaccel(AVHWAccel *hwaccel);
5528 
5529 /**
5530  * If hwaccel is NULL, returns the first registered hardware accelerator,
5531  * if hwaccel is non-NULL, returns the next registered hardware accelerator
5532  * after hwaccel, or NULL if hwaccel is the last one.
5533  */
5534 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5535 
5536 
5537 /**
5538  * Lock operation used by lockmgr
5539  */
5540 enum AVLockOp {
5541  AV_LOCK_CREATE, ///< Create a mutex
5542  AV_LOCK_OBTAIN, ///< Lock the mutex
5543  AV_LOCK_RELEASE, ///< Unlock the mutex
5544  AV_LOCK_DESTROY, ///< Free mutex resources
5545 };
5546 
5547 /**
5548  * Register a user provided lock manager supporting the operations
5549  * specified by AVLockOp. The "mutex" argument to the function points
5550  * to a (void *) where the lockmgr should store/get a pointer to a user
5551  * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5552  * value left by the last call for all other ops. If the lock manager is
5553  * unable to perform the op then it should leave the mutex in the same
5554  * state as when it was called and return a non-zero value. However,
5555  * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5556  * have been successfully destroyed. If av_lockmgr_register succeeds
5557  * it will return a non-negative value, if it fails it will return a
5558  * negative value and destroy all mutex and unregister all callbacks.
5559  * av_lockmgr_register is not thread-safe, it must be called from a
5560  * single thread before any calls which make use of locking are used.
5561  *
5562  * @param cb User defined callback. av_lockmgr_register invokes calls
5563  * to this callback and the previously registered callback.
5564  * The callback will be used to create more than one mutex
5565  * each of which must be backed by its own underlying locking
5566  * mechanism (i.e. do not use a single static object to
5567  * implement your lock manager). If cb is set to NULL the
5568  * lockmgr will be unregistered.
5569  */
5570 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5571 
5572 /**
5573  * Get the type of the given codec.
5574  */
5575 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5576 
5577 /**
5578  * Get the name of a codec.
5579  * @return a static string identifying the codec; never NULL
5580  */
5581 const char *avcodec_get_name(enum AVCodecID id);
5582 
5583 /**
5584  * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5585  * with no corresponding avcodec_close()), 0 otherwise.
5586  */
5588 
5589 /**
5590  * @return a non-zero number if codec is an encoder, zero otherwise
5591  */
5592 int av_codec_is_encoder(const AVCodec *codec);
5593 
5594 /**
5595  * @return a non-zero number if codec is a decoder, zero otherwise
5596  */
5597 int av_codec_is_decoder(const AVCodec *codec);
5598 
5599 /**
5600  * @return descriptor for given codec ID or NULL if no descriptor exists.
5601  */
5603 
5604 /**
5605  * Iterate over all codec descriptors known to libavcodec.
5606  *
5607  * @param prev previous descriptor. NULL to get the first descriptor.
5608  *
5609  * @return next descriptor or NULL after the last descriptor
5610  */
5612 
5613 /**
5614  * @return codec descriptor with the given name or NULL if no such descriptor
5615  * exists.
5616  */
5618 
5619 /**
5620  * @}
5621  */
5622 
5623 #endif /* AVCODEC_AVCODEC_H */
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:1782
codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it ...
Definition: avcodec.h:548
const struct AVCodec * codec
Definition: avcodec.h:1521
AVRational framerate
Definition: avcodec.h:3312
discard all frames except keyframes
Definition: avcodec.h:688
AVSideDataParamChangeFlags
Definition: avcodec.h:1482
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor Code outside libavcodec should access this field using: av_codec_{get,set}_codec_descriptor(avctx)
Definition: avcodec.h:3337
attribute_deprecated int intra_quant_bias
Definition: avcodec.h:2030
static enum AVPixelFormat pix_fmt
#define AV_NUM_DATA_POINTERS
Definition: frame.h:172
AVPacketSideDataType
Definition: avcodec.h:1224
int64_t pts_correction_num_faulty_dts
Number of incorrect PTS values so far.
Definition: avcodec.h:3356
A list of zero terminated key/value strings.
Definition: avcodec.h:1367
void av_free_packet(AVPacket *pkt)
Free a packet.
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
The optional first identifier line of a WebVTT cue.
Definition: avcodec.h:1354
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3784
int mpeg_quant
0-> h263 quant 1-> mpeg quant
Definition: avcodec.h:1829
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:2958
A dummy id pointing at the start of audio codecs.
Definition: avcodec.h:330
attribute_deprecated int avpicture_deinterlace(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
deinterlace - if not supported return -1
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1706
int capabilities
Hardware accelerated codec capabilities.
Definition: avcodec.h:3620
int av_lockmgr_register(int(*cb)(void **mutex, enum AVLockOp op))
Register a user provided lock manager supporting the operations specified by AVLockOp.
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:2550
Unlock the mutex.
Definition: avcodec.h:5543
attribute_deprecated int rc_qmod_freq
Definition: avcodec.h:2583
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1458
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Subtitle event position.
Definition: avcodec.h:1341
attribute_deprecated int request_channels
Decoder should decode to this many channels if it can (0 for default)
Definition: avcodec.h:2325
int64_t next_frame_offset
Definition: avcodec.h:4555
int id
id
Definition: avcodec.h:1176
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:1790
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:2653
Dummy codec for streams containing only metadata information.
Definition: avcodec.h:554
int height
Definition: avcodec.h:1184
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:4707
attribute_deprecated int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples)
This side data should be associated with a video stream and contains Stereoscopic 3D information in f...
Definition: avcodec.h:1285
const char * avcodec_configuration(void)
Return the libavcodec build-time configuration.
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2247
attribute_deprecated unsigned int stream_codec_tag
Definition: avcodec.h:1551
void av_codec_set_pkt_timebase(AVCodecContext *avctx, AVRational val)
struct AVBitStreamFilter * next
Definition: avcodec.h:5391
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3788
int size
Definition: avcodec.h:1434
attribute_deprecated int lmax
Definition: avcodec.h:2687
int mb_lmin
minimum MB lagrange multipler
Definition: avcodec.h:2146
const char * avcodec_license(void)
Return the libavcodec license.
enhanced predictive zonal search
Definition: avcodec.h:668
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:4713
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1912
int av_picture_crop(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int top_band, int left_band)
Crop image top and left side.
external API header
int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size)
Copy pixel data from an AVPicture into a buffer.
unsigned num_rects
Definition: avcodec.h:3813
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
A dummy ID pointing at the start of various fake codecs.
Definition: avcodec.h:536
char * stats_in
pass2 encoding statistics input buffer Concatenated stuff from stats_out of pass1 should be placed he...
Definition: avcodec.h:2789
int ildct_cmp
interlaced DCT comparison function
Definition: avcodec.h:1937
attribute_deprecated void * thread_opaque
Definition: avcodec.h:3110
size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
Put a string representing the codec tag codec_tag in buf.
int rtp_payload_size
Definition: avcodec.h:2752
discard all non intra frames
Definition: avcodec.h:687
int duration
Duration of the current frame.
Definition: avcodec.h:4682
discard all
Definition: avcodec.h:689
static AVPacket pkt
int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of audio.
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:3013
int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
Converts AVChromaLocation to swscale x/y chroma position.
void avcodec_register_all(void)
Register all the codecs, parsers and bitstream filters which were enabled at configuration time...
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.
Definition: avcodec.h:4644
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt)
Decode a subtitle message.
attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic)
int av_dup_packet(AVPacket *pkt)
Picture data structure.
Definition: avcodec.h:3754
int(* alloc_frame)(AVCodecContext *avctx, AVFrame *frame)
Allocate a custom buffer.
Definition: avcodec.h:3634
int profile
profile
Definition: avcodec.h:3125
int frame_skip_cmp
frame skip comparison function
Definition: avcodec.h:2716
An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of structures with info about macroblo...
Definition: avcodec.h:1264
AVCodec.
Definition: avcodec.h:3482
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2309
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:1845
int avpicture_fill(AVPicture *picture, const uint8_t *ptr, enum AVPixelFormat pix_fmt, int width, int height)
Setup the picture fields based on the specified image parameters and the provided image data buffer...
AVLockOp
Lock operation used by lockmgr.
Definition: avcodec.h:5540
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:494
uint64_t vbv_delay
VBV delay coded in the last frame (in periods of a 27 MHz clock).
Definition: avcodec.h:3272
char * text
0 terminated plain UTF-8 text
Definition: avcodec.h:3797
attribute_deprecated unsigned avcodec_get_edge_width(void)
Return the amount of padding in pixels which the get_buffer callback must provide around the edge of ...
attribute_deprecated int me_method
This option does nothing.
Definition: avcodec.h:1739
int scenechange_threshold
scene change detection threshold 0 is default, larger means fewer detected scene changes.
Definition: avcodec.h:2089
Macro definitions for various function/variable attributes.
attribute_deprecated void av_log_missing_feature(void *avc, const char *feature, int want_sample)
Log a generic warning message about a missing feature.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1641
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)
attribute_deprecated int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx)
Resample an array of samples using a previously configured context.
int av_codec_is_decoder(const AVCodec *codec)
AVSubtitleRect ** rects
Definition: avcodec.h:3814
enum AVAudioServiceType audio_service_type
Type of service that the audio stream conveys.
Definition: avcodec.h:2347
const AVCodecDescriptor * avcodec_descriptor_next(const AVCodecDescriptor *prev)
Iterate over all codec descriptors known to libavcodec.
void av_picture_copy(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
Copy image src to dst.
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align)
Fill AVFrame audio data and linesize pointers.
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:3236
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
int av_codec_is_encoder(const AVCodec *codec)
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3786
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2932
float p_masking
p block masking (0-> disabled)
Definition: avcodec.h:1873
void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val)
int context_model
context model
Definition: avcodec.h:2674
AVCodecParserContext * parser
Definition: avcodec.h:5378
attribute_deprecated int rc_strategy
Definition: avcodec.h:1803
Public dictionary API.
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:1585
int mb_lmax
maximum MB lagrange multipler
Definition: avcodec.h:2153
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
attribute_deprecated float rc_buffer_aggressivity
Definition: avcodec.h:2628
attribute_deprecated const char * rc_eq
Definition: avcodec.h:2606
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2280
Lock the mutex.
Definition: avcodec.h:5542
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:2944
int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict)
Unpack a dictionary from side_data.
int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
int subtitle_header_size
Definition: avcodec.h:3247
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:2024
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:517
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt)
Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found.
struct AVCodecDefault AVCodecDefault
Definition: avcodec.h:3475
uint16_t * chroma_intra_matrix
custom intra quantization matrix Code outside libavcodec should access this field using av_codec_g/se...
Definition: avcodec.h:3419
This side data contains a 3x3 transformation matrix describing an affine transformation that needs to...
Definition: avcodec.h:1279
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:1799
int pre_dia_size
ME prepass diamond size & shape.
Definition: avcodec.h:1988
int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
Initialize a reference-counted packet from av_malloc()ed data.
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1627
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:1517
int me_cmp
motion estimation comparison function
Definition: avcodec.h:1919
int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of video.
static AVFrame * frame
struct AVCodecParser * next
Definition: avcodec.h:4739
void av_codec_set_lowres(AVCodecContext *avctx, int val)
const char * name
Definition: avcodec.h:5384
attribute_deprecated void av_resample_close(struct AVResampleContext *c)
int coder_type
coder type
Definition: avcodec.h:2667
uint8_t * data
Definition: avcodec.h:1433
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Motion_Est_ID
motion estimation type.
Definition: avcodec.h:663
uint8_t * data
Definition: avcodec.h:1383
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:3023
AVColorRange
MPEG vs JPEG YUV range.
Definition: pixfmt.h:537
const AVCodecDescriptor * av_codec_get_codec_descriptor(const AVCodecContext *avctx)
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:3787
void avpicture_free(AVPicture *picture)
Free a picture previously allocated by avpicture_alloc().
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3006
int min_prediction_order
Definition: avcodec.h:2729
float lumi_masking
luminance masking (0-> disabled)
Definition: avcodec.h:1852
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:2781
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:476
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1451
struct AVBitStreamFilterContext * next
Definition: avcodec.h:5379
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2254
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
hexagon based search
Definition: avcodec.h:670
AVCodec * avcodec_find_encoder_by_name(const char *name)
Find a registered encoder with the specified name.
int chromaoffset
chroma qp offset from luma
Definition: avcodec.h:2195
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS])
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
int slice_count
slice count
Definition: avcodec.h:1887
uint16_t * av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx)
attribute_deprecated void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
Libavcodec version macros.
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:3328
no search, that is use 0,0 vector whenever one is needed
Definition: avcodec.h:664
const uint64_t * channel_layouts
array of support channel layouts, or NULL if unknown. array is terminated by 0
Definition: avcodec.h:3506
reserved for experiments
Definition: avcodec.h:669
const AVCodecDefault * defaults
Private codec-specific defaults.
Definition: avcodec.h:3543
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:102
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1822
int64_t pos
Byte position of currently parsed frame in stream.
Definition: avcodec.h:4670
attribute_deprecated float rc_initial_cplx
Definition: avcodec.h:2631
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
Create a mutex.
Definition: avcodec.h:5541
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst)
Convert valid timing fields (timestamps / durations) in a packet from one timebase to another...
int priv_data_size
Definition: avcodec.h:4729
struct AVCodecParser * parser
Definition: avcodec.h:4551
AVAudioServiceType
Definition: avcodec.h:692
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3785
discard all bidirectional frames
Definition: avcodec.h:686
An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
Definition: avcodec.h:1243
int frame_skip_threshold
frame skip threshold
Definition: avcodec.h:2695
int me_sub_cmp
subpixel motion estimation comparison function
Definition: avcodec.h:1925
void av_packet_free_side_data(AVPacket *pkt)
Convenience function to free all the side data stored.
int qmax
maximum quantizer
Definition: avcodec.h:2564
AVCodec * av_codec_next(const AVCodec *c)
If c is NULL, returns the first registered codec, if c is non-NULL, returns the next registered codec...
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:2355
int skip_alpha
Skip processing alpha if supported by codec.
Definition: avcodec.h:3391
int64_t pts_correction_last_pts
Number of incorrect DTS values so far.
Definition: avcodec.h:3357
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:3062
int avcodec_is_open(AVCodecContext *s)
int error_concealment
error concealment flags
Definition: avcodec.h:2842
int64_t convergence_duration
Time difference in AVStream->time_base units from the pts of this packet to the point at which the ou...
Definition: avcodec.h:1477
int capabilities
Codec capabilities.
Definition: avcodec.h:3501
int initial_padding
Audio only.
Definition: avcodec.h:3304
struct AVDictionary AVDictionary
Definition: dict.h:91
void av_bitstream_filter_close(AVBitStreamFilterContext *bsf)
Release bitstream filter context.
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:425
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1416
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1607
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Find the best pixel format to convert to given a certain source pixel format.
int rc_max_rate
maximum bitrate
Definition: avcodec.h:2614
int log_level_offset
Definition: avcodec.h:1518
enum AVMediaType avcodec_get_type(enum AVCodecID codec_id)
Get the type of the given codec.
attribute_deprecated int inter_quant_bias
Definition: avcodec.h:2036
const char * name
Name of the codec implementation.
Definition: avcodec.h:3489
float i_quant_factor
qscale factor between P and I-frames If > 0 then the last p frame quantizer will be used (q= lastp_q*...
Definition: avcodec.h:1838
int side_data_elems
Definition: avcodec.h:1445
int width
width and height in 1/16 pel
Definition: avcodec.h:1183
int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Shrink the already allocated side data buffer.
const char * long_name
A more descriptive name for this codec.
Definition: avcodec.h:578
#define AV_PARSER_PTS_NB
Definition: avcodec.h:4576
AVCodecParser * av_parser_next(const AVCodecParser *c)
transformed exhaustive search algorithm
Definition: avcodec.h:672
#define av_printf_format(fmtpos, attrpos)
Definition: attributes.h:148
int priv_data_size
Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.
Definition: avcodec.h:3718
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1439
int av_codec_get_lowres(const AVCodecContext *avctx)
reference-counted frame API
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2333
uint32_t end_display_time
Definition: avcodec.h:3812
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3815
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2591
int av_packet_merge_side_data(AVPacket *pkt)
int props
Codec properties, a combination of AV_CODEC_PROP_* flags.
Definition: avcodec.h:582
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:2117
int me_penalty_compensation
Definition: avcodec.h:2160
AVBitStreamFilter * av_bitstream_filter_next(const AVBitStreamFilter *f)
If f is NULL, return the first registered bitstream filter, if f is non-NULL, return the next registe...
Not part of ABI.
Definition: avcodec.h:702
int refs
number of reference frames
Definition: avcodec.h:2188
attribute_deprecated int scenechange_factor
Multiplied by qscale for each frame and added to scene_change_score.
Definition: avcodec.h:2203
A bitmap, pict will be set.
Definition: avcodec.h:3766
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
Copy only "properties" fields from src to dst.
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:2598
int bit_rate
the average bitrate
Definition: avcodec.h:1577
audio channel layout utility functions
int64_t timecode_frame_start
GOP timecode frame start number.
Definition: avcodec.h:2742
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3503
attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples, int *frame_size_ptr, AVPacket *avpkt)
Wrapper function which calls avcodec_decode_audio4.
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2900
AVPicture pict
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:3794
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:3593
iterative search
Definition: avcodec.h:673
int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
This side data contains quality related information from the encoder.
Definition: avcodec.h:1303
attribute_deprecated void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance)
Compensate samplerate/timestamp drift.
int width
picture width / height.
Definition: avcodec.h:1691
AVBitStreamFilterContext * av_bitstream_filter_init(const char *name)
Create and initialize a bitstream filter context given a bitstream filter name.
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2971
int64_t offset
byte offset from starting packet start
Definition: avcodec.h:4589
int priv_data_size
Definition: avcodec.h:3518
int profile
Definition: avcodec.h:3471
float rc_max_available_vbv_use
Ratecontrol attempt to use, at maximum, of what can be used without an underflow. ...
Definition: avcodec.h:2639
float rc_min_vbv_overflow_use
Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow.
Definition: avcodec.h:2646
int64_t convergence_duration
Time difference in stream time base units from the pts of this packet to the point at which the outpu...
Definition: avcodec.h:4617
void av_parser_close(AVCodecParserContext *s)
int b_frame_strategy
Definition: avcodec.h:1807
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:2226
void av_register_bitstream_filter(AVBitStreamFilter *bsf)
Register a bitstream filter.
int side_data_only_packets
Encoding only.
Definition: avcodec.h:3287
uint16_t format
Definition: avcodec.h:3810
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
int level
level
Definition: avcodec.h:3214
int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt)
Decode the audio frame of size avpkt->size from avpkt->data into frame.
attribute_deprecated void(* release_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called to release buffers which were allocated with get_buffer.
Definition: avcodec.h:2435
const AVProfile * profiles
array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN} ...
Definition: avcodec.h:3509
attribute_deprecated int(* get_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called at the beginning of each frame to get a buffer for it.
Definition: avcodec.h:2421
int64_t reordered_opaque
opaque 64bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Definition: avcodec.h:2925
int refcounted_frames
If non-zero, the decoded audio and video frames returned from avcodec_decode_video2() and avcodec_dec...
Definition: avcodec.h:2546
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1650
int skip_top
Number of macroblock rows at the top which are skipped.
Definition: avcodec.h:2124
int mb_decision
macroblock decision mode
Definition: avcodec.h:2064
int last_predictor_count
amount of previous MV predictors (2a+1 x 2a+1 square)
Definition: avcodec.h:1967
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:2571
attribute_deprecated int mb_threshold
Definition: avcodec.h:2109
attribute_deprecated float rc_qsquish
Definition: avcodec.h:2578
void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
char * sub_charenc
DTS of the last frame.
Definition: avcodec.h:3365
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:107
const AVCodecDescriptor * avcodec_descriptor_get_by_name(const char *name)
RcOverride * rc_override
Definition: avcodec.h:2599
int64_t last_pos
Previous frame byte position.
Definition: avcodec.h:4675
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:3043
int sub_charenc_mode
Subtitles character encoding mode.
Definition: avcodec.h:3373
int av_packet_split_side_data(AVPacket *pkt)
int av_codec_get_max_lowres(const AVCodec *codec)
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal decoder state / flush internal buffers.
FAKE codec to indicate a MPEG-4 Systems stream (only used by libavformat)
Definition: avcodec.h:552
enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
int(* update_thread_context)(AVCodecContext *dst, const AVCodecContext *src)
Copy necessary context variables from a previous thread context to the current one.
Definition: avcodec.h:3537
int frame_skip_factor
frame skip factor
Definition: avcodec.h:2702
const char * av_get_profile_name(const AVCodec *codec, int profile)
Return a name for the specified profile, if available.
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2292
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:4658
int(* execute2)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count)
The codec may call this to execute several independent things.
Definition: avcodec.h:3103
attribute_deprecated void av_destruct_packet(AVPacket *pkt)
Default packet destructor.
const char * long_name
Descriptive name for the codec, meant to be more human readable than name.
Definition: avcodec.h:3494
int bidir_refine
Definition: avcodec.h:2167
int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Filter bitstream.
attribute_deprecated void av_log_ask_for_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message asking for a sample.
AVCodecParserContext * av_parser_init(int codec_id)
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
void(* rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb)
Definition: avcodec.h:2750
const AVRational * supported_framerates
array of supported framerates, or NULL if any, array is terminated by {0,0}
Definition: avcodec.h:3502
A list of zero terminated key/value strings.
Definition: avcodec.h:1330
attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic)
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:59
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3675
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
int compression_level
Definition: avcodec.h:1599
int seek_preroll
Number of samples to skip after a discontinuity.
Definition: avcodec.h:3398
int sample_rate
samples per second
Definition: avcodec.h:2272
enum AVDiscard skip_idct
Skip IDCT/dequantization for selected frames.
Definition: avcodec.h:3229
int frame_bits
number of bits used for the previously encoded frame
Definition: avcodec.h:2774
attribute_deprecated AVPacket * pkt
Definition: avcodec.h:3263
Plain text, the text field must be set by the decoder and is authoritative.
Definition: avcodec.h:3772
int debug
debug
Definition: avcodec.h:2852
main external API structure.
Definition: avcodec.h:1512
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
uint8_t * av_packet_pack_dictionary(AVDictionary *dict, int *size)
Pack a dictionary for use in side_data.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
int av_copy_packet(AVPacket *dst, const AVPacket *src)
Copy packet, including contents.
int pre_me
prepass for motion estimation
Definition: avcodec.h:1974
int qmin
minimum quantizer
Definition: avcodec.h:2557
attribute_deprecated ReSampleContext * av_audio_resample_init(int output_channels, int input_channels, int output_rate, int input_rate, enum AVSampleFormat sample_fmt_out, enum AVSampleFormat sample_fmt_in, int filter_length, int log2_phase_count, int linear, double cutoff)
Initialize audio resampling context.
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:1544
float spatial_cplx_masking
spatial complexity masking (0-> disabled)
Definition: avcodec.h:1866
Data found in BlockAdditional element of matroska container.
Definition: avcodec.h:1349
attribute_deprecated int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVFrame *pict)
int extradata_size
Definition: avcodec.h:1628
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
struct AVCodec * next
Definition: avcodec.h:3519
struct AVBitStreamFilter * filter
Definition: avcodec.h:5377
uint16_t * intra_matrix
custom intra quantization matrix
Definition: avcodec.h:2074
int slice_flags
slice flags
Definition: avcodec.h:2044
Describe the class of an AVClass context structure.
Definition: log.h:67
int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height)
Allocate memory for the pixels of a picture and setup the AVPicture fields for it.
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:2533
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:2240
rational number numerator/denominator
Definition: rational.h:43
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:2233
const char * name
short name for the profile
Definition: avcodec.h:3472
void av_register_codec_parser(AVCodecParser *parser)
AVFieldOrder
Definition: avcodec.h:1494
Recommmends skipping the specified number of samples.
Definition: avcodec.h:1314
int(* init_thread_copy)(AVCodecContext *)
If defined, called on thread contexts when they are created.
Definition: avcodec.h:3529
attribute_deprecated void audio_resample_close(ReSampleContext *s)
Free resample context.
AVMediaType
Definition: avutil.h:191
discard useless packets like 0 size packets in avi
Definition: avcodec.h:684
refcounted data buffer API
char * codec_whitelist
&#39;,&#39; separated list of allowed decoders.
Definition: avcodec.h:3437
const char * name
Name of the codec described by this descriptor.
Definition: avcodec.h:574
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:1814
attribute_deprecated void * priv
Definition: avcodec.h:1456
int frame_skip_exp
frame skip exponent
Definition: avcodec.h:2709
attribute_deprecated int dtg_active_format
DTG active format information (additional aspect ratio information only used in DVB MPEG-2 transport ...
Definition: avcodec.h:2007
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:2549
attribute_deprecated int me_threshold
Definition: avcodec.h:2103
uint16_t * inter_matrix
custom inter quantization matrix
Definition: avcodec.h:2081
AVHWAccel * av_hwaccel_next(const AVHWAccel *hwaccel)
If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL...
This struct describes the properties of a single codec described by an AVCodecID. ...
Definition: avcodec.h:566
float dark_masking
darkness masking (0-> disabled)
Definition: avcodec.h:1880
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1593
static int64_t pts
Global timestamp for the audio frames.
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:2131
int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, const short *samples)
Encode an audio frame from samples into buf.
AVCodec * avcodec_find_decoder_by_name(const char *name)
Find a registered decoder with the specified name.
This side data should be associated with an audio stream and contains ReplayGain information in form ...
Definition: avcodec.h:1270
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:4702
float temporal_cplx_masking
temporary complexity masking (0-> disabled)
Definition: avcodec.h:1859
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3664
Pan Scan area.
Definition: avcodec.h:1170
const AVClass * priv_class
AVClass for the private context.
Definition: avcodec.h:3508
#define attribute_deprecated
Definition: attributes.h:86
int noise_reduction
noise reduction strength
Definition: avcodec.h:2096
int(* start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Called at the beginning of each frame or field picture.
Definition: avcodec.h:3650
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:1717
enum AVMediaType type
Definition: avcodec.h:568
uint8_t max_lowres
maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres() ...
Definition: avcodec.h:3507
A reference to a data buffer.
Definition: buffer.h:81
discard all non reference
Definition: avcodec.h:685
attribute_deprecated struct AVResampleContext * av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff)
Initialize an audio resampler.
An AV_PKT_DATA_JP_DUALMONO side data packet indicates that the packet may contain "dual mono" audio s...
Definition: avcodec.h:1324
AVPacketSideData * side_data
Additional packet data that can be provided by the container.
Definition: avcodec.h:1444
int mb_cmp
macroblock comparison function (not supported yet)
Definition: avcodec.h:1931
attribute_deprecated int(* reget_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called at the beginning of a frame to get cr buffer for it.
Definition: avcodec.h:2450
enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
Converts swscale x/y chroma position to AVChromaLocation.
AVRational av_codec_get_pkt_timebase(const AVCodecContext *avctx)
Free mutex resources.
Definition: avcodec.h:5544
rational numbers
attribute_deprecated void void av_register_hwaccel(AVHWAccel *hwaccel)
Register the hardware accelerator hwaccel.
raw UTF-8 text
Definition: avcodec.h:512
struct AVHWAccel * next
Definition: avcodec.h:3629
int nsse_weight
noise vs.
Definition: avcodec.h:3118
int(* init)(AVCodecContext *)
Definition: avcodec.h:3550
attribute_deprecated float border_masking
Definition: avcodec.h:2138
uint32_t start_display_time
Definition: avcodec.h:3811
int av_codec_get_seek_preroll(const AVCodecContext *avctx)
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call...
int(* encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size, const struct AVSubtitle *sub)
Definition: avcodec.h:3551
void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc)
int prediction_method
prediction method (needed for huffyuv)
Definition: avcodec.h:1893
AVProfile.
Definition: avcodec.h:3470
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:3034
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:2796
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
int caps_internal
Internal codec capabilities.
Definition: avcodec.h:3576
unsigned properties
Definition: avcodec.h:3445
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:3222
int thread_safe_callbacks
Set by the client if its custom get_buffer() callback can be called synchronously from another thread...
Definition: avcodec.h:3072
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
Set the fields of the given AVCodecContext to default values corresponding to the given codec (defaul...
attribute_deprecated float rc_qmod_amp
Definition: avcodec.h:2581
AVPictureStructure
Definition: avcodec.h:4542
int trellis
trellis RD quantization
Definition: avcodec.h:2723
The optional settings (rendering instructions) that immediately follow the timestamp specifier of a W...
Definition: avcodec.h:1360
#define MKBETAG(a, b, c, d)
Definition: common.h:342
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
int slices
Number of slices.
Definition: avcodec.h:2263
ASS as defined in Matroska.
Definition: avcodec.h:532
void * priv_data
Definition: avcodec.h:1554
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:2316
void av_codec_set_seek_preroll(AVCodecContext *avctx, int val)
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:550
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:3778
int64_t frame_offset
Definition: avcodec.h:4552
enum AVCodecID id
Definition: avcodec.h:567
pixel format definitions
int dia_size
ME diamond size & shape.
Definition: avcodec.h:1960
int b_sensitivity
Adjust sensitivity of b_frame_strategy 1.
Definition: avcodec.h:2219
uint8_t * dump_separator
dump format separator.
Definition: avcodec.h:3429
uneven multi-hexagon search
Definition: avcodec.h:671
as in Berlin toast format
Definition: avcodec.h:442
int channels
number of audio channels
Definition: avcodec.h:2273
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:3684
const int * supported_samplerates
array of supported audio samplerates, or NULL if unknown, array is terminated by 0 ...
Definition: avcodec.h:3504
int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color)
Pad image.
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:4724
int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
Calculate the size in bytes that a picture of the given width and height would occupy if stored in th...
unsigned avcodec_version(void)
Return the LIBAVCODEC_VERSION_INT constant.
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:3804
attribute_deprecated int error_rate
Definition: avcodec.h:3255
unsigned av_codec_get_codec_properties(const AVCodecContext *avctx)
int mv0_threshold
Note: Value depends upon the compare function used for fullpel ME.
Definition: avcodec.h:2212
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1614
AVDiscard
Definition: avcodec.h:680
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1432
void avcodec_register(AVCodec *codec)
Register the codec codec and initialize libavcodec.
int64_t pts_correction_last_dts
PTS of the last frame.
Definition: avcodec.h:3358
const char * av_packet_side_data_name(enum AVPacketSideDataType type)
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:1903
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2303
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:4567
int max_prediction_order
Definition: avcodec.h:2735
int64_t pts_correction_num_faulty_pts
Current statistics for PTS correction.
Definition: avcodec.h:3355
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:2269
void(* decode_mb)(struct MpegEncContext *s)
Called for every Macroblock in a slice.
Definition: avcodec.h:3695
void(* init_static_data)(struct AVCodec *codec)
Initialize codec static data, called from avcodec_register().
Definition: avcodec.h:3548
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:559
uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
enum AVSampleFormat * sample_fmts
array of supported sample formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3505
static int height
attribute_deprecated int lmin
Definition: avcodec.h:2681
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
int debug_mv
debug Code outside libavcodec should access this field using AVOptions
Definition: avcodec.h:2889
int stream_index
Definition: avcodec.h:1435
const char *const * mime_types
MIME type(s) associated with the codec.
Definition: avcodec.h:589
int rc_min_rate
minimum bitrate
Definition: avcodec.h:2621
int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src)
Copy packet side data.
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:2340
int me_pre_cmp
motion estimation prepass comparison function
Definition: avcodec.h:1981
The number of side data elements (in fact a bit more than it).
Definition: avcodec.h:1377
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
This structure stores compressed data.
Definition: avcodec.h:1410
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub)
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:4598
int delay
Codec delay.
Definition: avcodec.h:1674
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:1995
int strict_std_compliance
strictly follow the standard (MPEG4, ...).
Definition: avcodec.h:2830
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:4629
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1426
struct ReSampleContext ReSampleContext
Definition: avcodec.h:4966
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:3319
A dummy ID pointing at the start of subtitle codecs.
Definition: avcodec.h:509
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:1569
int thread_type
Which multithreading methods to use.
Definition: avcodec.h:3053
AVSubtitleType
Definition: avcodec.h:3763
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
discard nothing
Definition: avcodec.h:683
This side data should be associated with an audio stream and corresponds to enum AVAudioServiceType.
Definition: avcodec.h:1291
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:3246
int keyint_min
minimum GOP size
Definition: avcodec.h:2181
attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic)
static int width