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 481 of file avcodec.c.

Referenced by avformat_find_stream_info(), dump_stream_format(), and dump_stream_group().

◆ 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 57 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

frame	the 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_channels	channel count
sample_fmt	sample format
buf	buffer to use for frame data
buf_size	size of buffer
align	plane 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 369 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 350 of file avcodec.c.

Referenced by compute_crc_of_packets(), decoder_decode_frame(), decoder_thread(), ftr_flush(), imm5_flush(), LLVMFuzzerTestOneInput(), process_command(), read_interval_packets(), and rewind_file().

◆ av_get_audio_frame_duration()

int av_get_audio_frame_duration	(	AVCodecContext *	avctx,
		int	frame_bytes
	)

Return audio frame duration.

Parameters

avctx	codec context
frame_bytes	size of the frame, or 0 if unknown

Returns: frame duration, in samples, if known. 0 if not able to determine.

Definition at line 786 of file utils.c.

Referenced by compute_frame_duration().

◆ av_fast_padded_malloc()

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.

In addition the whole buffer will initially and after resizes be 0-initialized so that no uninitialized data will ever appear.

Definition at line 52 of file utils.c.

Referenced by allocate_buffers(), allocate_buffers2(), ape_decode_frame(), cdtoons_decode_frame(), cdxl_decode_frame(), cllc_decode_frame(), dcadec_decode_frame(), decode_block(), decode_frame(), decode_frame_lscr(), decode_huffman2(), decode_i_frame(), decode_idat_chunk(), decode_inter(), decode_inter_plane(), decode_intra(), decode_intra_plane(), decode_motion_vectors(), decode_mous(), decode_move(), decode_p_frame(), decode_zlib(), deinvert_buffer(), dwa_uncompress(), encode_frame(), encode_scanline_rle(), encode_scanline_zip(), ff_alloc_packet(), ff_mjpeg_find_marker(), ff_mpeg4_frame_end(), ff_mpeg_update_thread_context(), ff_mpv_reallocate_putbitbuffer(), generate_fake_vps(), lead_decode_frame(), mimic_decode_frame(), mobiclip_decode(), mp_decode_frame(), mpc7_decode_frame(), parse_nal_units(), parse_object_segment(), raw_decode(), sga_decode_frame(), svq1_decode_frame(), svq3_decode_slice_header(), tiff_unpack_strip(), tqi_decode_frame(), utvideo_encode_frame(), wavpack_encode_block(), wavpack_encode_frame(), wv_stereo(), and xpm_decode_frame().

◆ 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 65 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 676 of file avcodec.c.

Referenced by avcodec_open2(), avcodec_receive_packet(), avcodec_send_frame(), avcodec_send_packet(), ff_codec_close(), ff_decode_receive_frame(), process_frame(), read_frame_internal(), and try_decode_frame().

Modules

Functions