FFmpeg
4.2.2
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Go to the source code of this file.
Data Structures | |
struct | AVFifoBuffer |
Macros | |
#define | AV_FIFO_FLAG_AUTO_GROW (1 << 0) |
Typedefs | |
typedef struct AVFifo | AVFifo |
typedef int | AVFifoCB(void *opaque, void *buf, size_t *nb_elems) |
Functions | |
AVFifoBuffer * | av_fifo_alloc (unsigned int size) |
Initialize an AVFifoBuffer. More... | |
AVFifoBuffer * | av_fifo_alloc_array (size_t nmemb, size_t size) |
Initialize an AVFifoBuffer. More... | |
void | av_fifo_free (AVFifoBuffer *f) |
Free an AVFifoBuffer. More... | |
void | av_fifo_freep (AVFifoBuffer **f) |
Free an AVFifoBuffer and reset pointer to NULL. More... | |
void | av_fifo_reset (AVFifoBuffer *f) |
Reset the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied. More... | |
int | av_fifo_size (const AVFifoBuffer *f) |
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from it. More... | |
int | av_fifo_space (const AVFifoBuffer *f) |
Return the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write into it. More... | |
int | av_fifo_generic_peek_at (AVFifoBuffer *f, void *dest, int offset, int buf_size, void(*func)(void *, void *, int)) |
Feed data at specific position from an AVFifoBuffer to a user-supplied callback. More... | |
int | av_fifo_generic_peek (AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int)) |
Feed data from an AVFifoBuffer to a user-supplied callback. More... | |
int | av_fifo_generic_read (AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int)) |
Feed data from an AVFifoBuffer to a user-supplied callback. More... | |
int | av_fifo_generic_write (AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int)) |
Feed data from a user-supplied callback to an AVFifoBuffer. More... | |
int | av_fifo_realloc2 (AVFifoBuffer *f, unsigned int size) |
Resize an AVFifoBuffer. More... | |
int | av_fifo_grow (AVFifoBuffer *f, unsigned int additional_space) |
Enlarge an AVFifoBuffer. More... | |
void | av_fifo_drain (AVFifoBuffer *f, int size) |
Read and discard the specified amount of data from an AVFifoBuffer. More... | |
static uint8_t * | av_fifo_peek2 (const AVFifoBuffer *f, int offs) |
Return a pointer to the data stored in a FIFO buffer at a certain offset. More... | |
void | av_fifo_drain2 (AVFifo *f, size_t size) |
Discard the specified amount of data from an AVFifo. More... | |
int | av_fifo_read (AVFifo *f, void *buf, size_t nb_elems) |
Read data from a FIFO. More... | |
int | av_fifo_grow2 (AVFifo *f, size_t inc) |
Enlarge an AVFifo. More... | |
size_t | av_fifo_can_read (const AVFifo *f) |
Free an AVFifo and reset pointer to NULL. More... | |
size_t | av_fifo_can_write (const AVFifo *f) |
void | av_fifo_freep2 (AVFifo **f) |
int | av_fifo_write (AVFifo *f, const void *buf, size_t nb_elems) |
Write data into a FIFO. More... | |
AVFifo * | av_fifo_alloc2 (size_t elems, size_t elem_size, unsigned int flags) |
Allocate and initialize an AVFifo with a given element size. More... | |
a very simple circular buffer FIFO implementation
Definition in file fifo.h.
typedef int AVFifoCB(void *opaque, void *buf, size_t *nb_elems) |
AVFifoBuffer* av_fifo_alloc | ( | unsigned int | size | ) |
Initialize an AVFifoBuffer.
size | of FIFO |
AVFifoBuffer* av_fifo_alloc_array | ( | size_t | nmemb, |
size_t | size | ||
) |
Initialize an AVFifoBuffer.
nmemb | number of elements |
size | size of the single element |
void av_fifo_free | ( | AVFifoBuffer * | f | ) |
Free an AVFifoBuffer.
f | AVFifoBuffer to free |
void av_fifo_freep | ( | AVFifoBuffer ** | f | ) |
Free an AVFifoBuffer and reset pointer to NULL.
f | AVFifoBuffer to free |
void av_fifo_reset | ( | AVFifoBuffer * | f | ) |
Reset the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied.
f | AVFifoBuffer to reset |
int av_fifo_size | ( | const AVFifoBuffer * | f | ) |
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from it.
f | AVFifoBuffer to read from |
int av_fifo_space | ( | const AVFifoBuffer * | f | ) |
Return the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write into it.
f | AVFifoBuffer to write into |
int av_fifo_generic_peek_at | ( | AVFifoBuffer * | f, |
void * | dest, | ||
int | offset, | ||
int | buf_size, | ||
void(*)(void *, void *, int) | func | ||
) |
Feed data at specific position from an AVFifoBuffer to a user-supplied callback.
Similar as av_fifo_gereric_read but without discarding data.
f | AVFifoBuffer to read from |
offset | offset from current read position |
buf_size | number of bytes to read |
func | generic read function |
dest | data destination |
int av_fifo_generic_peek | ( | AVFifoBuffer * | f, |
void * | dest, | ||
int | buf_size, | ||
void(*)(void *, void *, int) | func | ||
) |
Feed data from an AVFifoBuffer to a user-supplied callback.
Similar as av_fifo_gereric_read but without discarding data.
f | AVFifoBuffer to read from |
buf_size | number of bytes to read |
func | generic read function |
dest | data destination |
int av_fifo_generic_read | ( | AVFifoBuffer * | f, |
void * | dest, | ||
int | buf_size, | ||
void(*)(void *, void *, int) | func | ||
) |
Feed data from an AVFifoBuffer to a user-supplied callback.
f | AVFifoBuffer to read from |
buf_size | number of bytes to read |
func | generic read function |
dest | data destination |
int av_fifo_generic_write | ( | AVFifoBuffer * | f, |
void * | src, | ||
int | size, | ||
int(*)(void *, void *, int) | func | ||
) |
Feed data from a user-supplied callback to an AVFifoBuffer.
f | AVFifoBuffer to write to |
src | data source; non-const since it may be used as a modifiable context by the function defined in func |
size | number of bytes to write |
func | generic write function; the first parameter is src, the second is dest_buf, the third is dest_buf_size. func must return the number of bytes written to dest_buf, or <= 0 to indicate no more data available to write. If func is NULL, src is interpreted as a simple byte array for source data. |
int av_fifo_realloc2 | ( | AVFifoBuffer * | f, |
unsigned int | size | ||
) |
Resize an AVFifoBuffer.
In case of reallocation failure, the old FIFO is kept unchanged.
f | AVFifoBuffer to resize |
size | new AVFifoBuffer size in bytes |
int av_fifo_grow | ( | AVFifoBuffer * | f, |
unsigned int | additional_space | ||
) |
Enlarge an AVFifoBuffer.
In case of reallocation failure, the old FIFO is kept unchanged. The new fifo size may be larger than the requested size.
f | AVFifoBuffer to resize |
additional_space | the amount of space in bytes to allocate in addition to av_fifo_size() |
void av_fifo_drain | ( | AVFifoBuffer * | f, |
int | size | ||
) |
Read and discard the specified amount of data from an AVFifoBuffer.
f | AVFifoBuffer to read from |
size | amount of data to read in bytes |
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inlinestatic |
Return a pointer to the data stored in a FIFO buffer at a certain offset.
The FIFO buffer is not modified.
f | AVFifoBuffer to peek at, f must be non-NULL |
offs | an offset in bytes, its absolute value must be less than the used buffer size or the returned pointer will point outside to the buffer data. The used buffer size can be checked with av_fifo_size(). |
void av_fifo_drain2 | ( | AVFifo * | f, |
size_t | size | ||
) |
Discard the specified amount of data from an AVFifo.
size | number of elements to discard, MUST NOT be larger than av_fifo_can_read(f) |
int av_fifo_read | ( | AVFifo * | f, |
void * | buf, | ||
size_t | nb_elems | ||
) |
Read data from a FIFO.
In case nb_elems > av_fifo_can_read(f), nothing is read and an error is returned.
f | the FIFO buffer |
buf | Buffer to store the data. nb_elems * av_fifo_elem_size(f) bytes will be written into buf on success. |
nb_elems | number of elements to read from FIFO |
int av_fifo_grow2 | ( | AVFifo * | f, |
size_t | inc | ||
) |
Enlarge an AVFifo.
On success, the FIFO will be large enough to hold exactly inc + av_fifo_can_read() + av_fifo_can_write() elements. In case of failure, the old FIFO is kept unchanged.
f | AVFifo to resize |
inc | number of elements to allocate for, in addition to the current allocated size |
size_t av_fifo_can_read | ( | const AVFifo * | f | ) |
Free an AVFifo and reset pointer to NULL.
f | Pointer to an AVFifo to free. *f == NULL is allowed. |
size_t av_fifo_can_write | ( | const AVFifo * | f | ) |
In other words, this number of elements or less is guaranteed to fit into the FIFO. More data may be written when the AV_FIFO_FLAG_AUTO_GROW flag was specified at FIFO creation, but this may involve memory allocation, which can fail.
void av_fifo_freep2 | ( | AVFifo ** | f | ) |
int av_fifo_write | ( | AVFifo * | f, |
const void * | buf, | ||
size_t | nb_elems | ||
) |
Write data into a FIFO.
In case nb_elems > av_fifo_can_write(f) and the AV_FIFO_FLAG_AUTO_GROW flag was not specified at FIFO creation, nothing is written and an error is returned.
Calling function is guaranteed to succeed if nb_elems <= av_fifo_can_write(f).
f | the FIFO buffer |
buf | Data to be written. nb_elems * av_fifo_elem_size(f) bytes will be read from buf on success. |
nb_elems | number of elements to write into FIFO |
AVFifo* av_fifo_alloc2 | ( | size_t | elems, |
size_t | elem_size, | ||
unsigned int | flags | ||
) |
Allocate and initialize an AVFifo with a given element size.
elems | initial number of elements that can be stored in the FIFO |
elem_size | Size in bytes of a single element. Further operations on the returned FIFO will implicitly use this element size. |
flags | a combination of AV_FIFO_FLAG_* |