FFmpeg
Modules | Functions
Utility functions

Modules

 Pixel formats
 Functions for working with pixel formats.
 
 FFT functions
 

Functions

void avcodec_string (char *buf, int buf_size, AVCodecContext *enc, int encode)
 
int avcodec_default_execute (AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
 
int avcodec_default_execute2 (AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
 
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. More...
 
void avcodec_flush_buffers (AVCodecContext *avctx)
 Reset the internal codec state / flush internal buffers. More...
 
int av_get_audio_frame_duration (AVCodecContext *avctx, int frame_bytes)
 Return audio frame duration. More...
 
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 which will always be 0. More...
 
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. More...
 
int avcodec_is_open (AVCodecContext *s)
 

Detailed Description

Miscellaneous utility functions related to both encoding and decoding (or neither).

Function Documentation

◆ avcodec_string()

void avcodec_string ( char *  buf,
int  buf_size,
AVCodecContext enc,
int  encode 
)

Definition at line 521 of file avcodec.c.

Referenced by avformat_find_stream_info(), and dump_stream_format().

◆ avcodec_default_execute()

int avcodec_default_execute ( AVCodecContext c,
int(*)(AVCodecContext *c2, void *arg2)  func,
void *  arg,
int ret,
int  count,
int  size 
)

Definition at line 65 of file avcodec.c.

Referenced by init_context_defaults(), and thread_execute().

◆ avcodec_default_execute2()

int avcodec_default_execute2 ( AVCodecContext c,
int(*)(AVCodecContext *c2, void *arg2, int, int func,
void *  arg,
int ret,
int  count 
)

◆ avcodec_fill_audio_frame()

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.

The buffer buf must be a preallocated buffer with a size big enough to contain the specified samples amount. The filled AVFrame data pointers will point to this buffer.

AVFrame extended_data channel pointers are allocated if necessary for planar audio.

Parameters
framethe AVFrame frame->nb_samples must be set prior to calling the function. This function fills in frame->data, frame->extended_data, frame->linesize[0].
nb_channelschannel count
sample_fmtsample format
bufbuffer to use for frame data
buf_sizesize of buffer
alignplane size sample alignment (0 = default)
Returns
>=0 on success, negative error code on failure
Todo:
return the size in bytes required to store the samples in case of success, at the next libavutil bump

Definition at line 368 of file utils.c.

◆ avcodec_flush_buffers()

void avcodec_flush_buffers ( AVCodecContext avctx)

Reset the internal codec state / flush internal buffers.

Should be called e.g. when seeking or when switching to a different stream.

Note
for decoders, this function just releases any references the decoder might keep internally, but the caller's references remain valid.
for encoders, this function will only do something if the encoder declares support for AV_CODEC_CAP_ENCODER_FLUSH. When called, the encoder will drain any remaining packets, and can then be re-used for a different stream (as opposed to sending a null frame which will leave the encoder in a permanent EOF state after draining). This can be desirable if the cost of tearing down and replacing the encoder instance is high.

Definition at line 378 of file avcodec.c.

Referenced by compute_crc_of_packets(), decoder_decode_frame(), imm5_flush(), LLVMFuzzerTestOneInput(), process_command(), process_input(), and rewind_file().

◆ av_get_audio_frame_duration()

int av_get_audio_frame_duration ( AVCodecContext avctx,
int  frame_bytes 
)

Return audio frame duration.

Parameters
avctxcodec context
frame_bytessize of the frame, or 0 if unknown
Returns
frame duration, in samples, if known. 0 if not able to determine.

Definition at line 811 of file utils.c.

Referenced by do_streamcopy(), and ff_compute_frame_duration().

◆ av_fast_padded_malloc()

void av_fast_padded_malloc ( void *  ptr,
unsigned int size,
size_t  min_size 
)

◆ av_fast_padded_mallocz()

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.

Definition at line 63 of file utils.c.

Referenced by decode_idat_chunk(), encode_frame(), and init_buffers().

◆ avcodec_is_open()

int avcodec_is_open ( AVCodecContext s)
Returns
a positive value if s is open (i.e. avcodec_open2() was called on it with no corresponding avcodec_close()), 0 otherwise.

Definition at line 713 of file avcodec.c.

Referenced by avcodec_close(), avcodec_open2(), avcodec_receive_frame(), avcodec_receive_packet(), avcodec_send_frame(), avcodec_send_packet(), mpegts_set_stream_info(), read_frame_internal(), and try_decode_frame().