#include "avformat.h"
#include "internal.h"
#include "libavcodec/internal.h"
#include "libavcodec/packet_internal.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timestamp.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"

Macros
#define	AV_PKT_FLAG_UNCODED_FRAME 0x2000

#define	CHUNK_START 0x1000

Functions
static void	frac_init (FFFrac *f, int64_t val, int64_t num, int64_t den)
	f = val + (num / den) + 0.5. More...

static void	frac_add (FFFrac *f, int64_t incr)
	Fractional addition to f: f = f + (incr / f->den). More...

AVRational	ff_choose_timebase (AVFormatContext s, AVStream st, int min_precision)
	Chooses a timebase for muxing the specified stream. More...

enum AVChromaLocation	ff_choose_chroma_location (AVFormatContext s, AVStream st)
	Chooses a timebase for muxing the specified stream. More...

int	avformat_alloc_output_context2 (AVFormatContext *avctx, ff_const59 AVOutputFormat oformat, const char format, const char filename)
	Allocate an AVFormatContext for an output format. More...

static int	validate_codec_tag (AVFormatContext s, AVStream st)

static int	init_muxer (AVFormatContext s, AVDictionary *options)

static int	init_pts (AVFormatContext *s)

static void	flush_if_needed (AVFormatContext *s)

static void	deinit_muxer (AVFormatContext *s)

int	avformat_init_output (AVFormatContext s, AVDictionary *options)
	Allocate the stream private data and initialize the codec, but do not write the header. More...

int	avformat_write_header (AVFormatContext s, AVDictionary *options)
	Allocate the stream private data and write the stream header to an output media file. More...

static void	guess_pkt_duration (AVFormatContext s, AVStream st, AVPacket *pkt)

static int	write_packet (AVFormatContext s, AVPacket pkt)
	Shift timestamps and call muxer; the original pts/dts are not kept. More...

static int	check_packet (AVFormatContext s, AVPacket pkt)

static int	prepare_input_packet (AVFormatContext s, AVStream st, AVPacket *pkt)

int	ff_interleave_add_packet (AVFormatContext s, AVPacket pkt, int(compare)(AVFormatContext , const AVPacket , const AVPacket ))
	Add packet to an AVFormatContext's packet_buffer list, determining its interleaved position using compare() function argument. More...

static int	interleave_compare_dts (AVFormatContext s, const AVPacket next, const AVPacket *pkt)

int	ff_interleave_packet_per_dts (AVFormatContext s, AVPacket out, AVPacket *pkt, int flush)
	Interleave an AVPacket per dts so it can be muxed. More...

int	ff_get_muxer_ts_offset (AVFormatContext s, int stream_index, int64_t offset)

const AVPacket *	ff_interleaved_peek (AVFormatContext *s, int stream)
	Find the next packet in the interleaving queue for the given stream. More...

static int	interleave_packet (AVFormatContext s, AVPacket out, AVPacket *in, int flush)
	Interleave an AVPacket correctly so it can be muxed. More...

static int	check_bitstream (AVFormatContext s, AVStream st, AVPacket *pkt)

static int	interleaved_write_packet (AVFormatContext s, AVPacket pkt, int flush)

static int	write_packet_common (AVFormatContext s, AVStream st, AVPacket *pkt, int interleaved)

static int	write_packets_from_bsfs (AVFormatContext s, AVStream st, AVPacket *pkt, int interleaved)

static int	write_packets_common (AVFormatContext s, AVPacket pkt, int interleaved)

int	av_write_frame (AVFormatContext s, AVPacket in)
	Write a packet to an output media file. More...

int	av_interleaved_write_frame (AVFormatContext s, AVPacket pkt)
	Write a packet to an output media file ensuring correct interleaving. More...

int	av_write_trailer (AVFormatContext *s)
	Write the stream trailer to an output media file and free the file private data. More...

int	av_get_output_timestamp (struct AVFormatContext s, int stream, int64_t dts, int64_t *wall)
	Get timing information for the data currently output. More...

int	ff_write_chained (AVFormatContext dst, int dst_stream, AVPacket pkt, AVFormatContext *src, int interleave)
	Write a packet to another muxer than the one the user originally intended. More...

static void	uncoded_frame_free (void unused, uint8_t data)

static int	write_uncoded_frame_internal (AVFormatContext s, int stream_index, AVFrame frame, int interleaved)

int	av_write_uncoded_frame (AVFormatContext s, int stream_index, AVFrame frame)
	Write an uncoded frame to an output media file. More...

int	av_interleaved_write_uncoded_frame (AVFormatContext s, int stream_index, AVFrame frame)
	Write an uncoded frame to an output media file. More...

int	av_write_uncoded_frame_query (AVFormatContext *s, int stream_index)
	Test whether a muxer supports uncoded frame. More...

Detailed Description

muxing functions for use within libavformat

Definition in file mux.c.

Macro Definition Documentation

◆ AV_PKT_FLAG_UNCODED_FRAME

#define AV_PKT_FLAG_UNCODED_FRAME 0x2000

Definition at line 541 of file mux.c.

◆ CHUNK_START

#define CHUNK_START 0x1000

Definition at line 828 of file mux.c.

Function Documentation

◆ frac_init()

static void frac_init	(	FFFrac *	f,
		int64_t	val,
		int64_t	num,
		int64_t	den
	)

static

f = val + (num / den) + 0.5.

'num' is normalized so that it is such as 0 <= num < den.

Parameters

f	fractional number
val	integer value
num	must be >= 0
den	must be >= 1

Definition at line 52 of file mux.c.

Referenced by init_pts().

◆ frac_add()

static void frac_add	(	FFFrac *	f,
		int64_t	incr
	)

static

Fractional addition to f: f = f + (incr / f->den).

Parameters

f	fractional number
incr	increment, can be positive or negative

Definition at line 70 of file mux.c.

◆ ff_choose_timebase()

AVRational ff_choose_timebase	(	AVFormatContext *	s,
		AVStream *	st,
		int	min_precision
	)

Chooses a timebase for muxing the specified stream.

The chosen timebase allows sample accurate timestamps based on the framerate or sample rate for audio streams. It also is at least as precise as 1/min_precision would be.

Definition at line 90 of file mux.c.

Referenced by nut_write_header().

◆ ff_choose_chroma_location()

enum AVChromaLocation ff_choose_chroma_location	(	AVFormatContext *	s,
		AVStream *	st
	)

Chooses a timebase for muxing the specified stream.

Definition at line 106 of file mux.c.

Referenced by mxf_write_header().

◆ avformat_alloc_output_context2()

int avformat_alloc_output_context2	(	AVFormatContext **	ctx,
		ff_const59 AVOutputFormat *	oformat,
		const char *	format_name,
		const char *	filename
	)

Allocate an AVFormatContext for an output format.

avformat_free_context() can be used to free the context and everything allocated by the framework within it.

Parameters

*ctx	is set to the created format context, or to NULL in case of failure
oformat	format to use for allocating the context, if NULL format_name and filename are used instead
format_name	the name of output format to use for allocating the context, if NULL filename is used instead
filename	the name of the filename to use for allocating the context, may be NULL

Returns: >= 0 in case of success, a negative AVERROR code in case of failure

Definition at line 136 of file mux.c.

Referenced by avdevice_list_output_sinks(), fifo_mux_init(), hls_mux_init(), initialize_fifo_tst_muxer_chain(), main(), open_output_file(), open_slave(), segment_mux_init(), webm_chunk_init(), and write_muxed_file().

◆ validate_codec_tag()

static int validate_codec_tag	(	AVFormatContext *	s,
		AVStream *	st
	)

static

Check that tag + id is in the table If neither is in the table -> OK If tag is in the table with another id -> FAIL If id is in the table with another tag -> FAIL unless strict < normal

Definition at line 197 of file mux.c.

Referenced by init_muxer().

◆ init_muxer()

static int init_muxer	(	AVFormatContext *	s,
		AVDictionary **	options
	)

static

Definition at line 231 of file mux.c.

Referenced by avformat_init_output().

◆ init_pts()

static int init_pts ( AVFormatContext * s )

static

Definition at line 423 of file mux.c.

Referenced by avformat_init_output(), and avformat_write_header().

◆ flush_if_needed()

static void flush_if_needed ( AVFormatContext * s )

static

Definition at line 468 of file mux.c.

Referenced by av_write_frame(), avformat_write_header(), and write_packet().

◆ deinit_muxer()

static void deinit_muxer ( AVFormatContext * s )

static

Definition at line 478 of file mux.c.

Referenced by av_write_trailer(), and avformat_write_header().

◆ guess_pkt_duration()

static void guess_pkt_duration	(	AVFormatContext *	s,
		AVStream *	st,
		AVPacket *	pkt
	)

static

Definition at line 642 of file mux.c.

Referenced by write_packet_common().

◆ write_packet()

static int write_packet	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

static

Shift timestamps and call muxer; the original pts/dts are not kept.

FIXME: this function should NEVER get undefined pts/dts beside when the AVFMT_NOTIMESTAMPS is set. Those additional safety checks should be dropped once the correct checks are set in the callers.

Definition at line 681 of file mux.c.

Referenced by interleaved_write_packet(), and write_packet_common().

◆ check_packet()

static int check_packet	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

static

Definition at line 764 of file mux.c.

Referenced by write_packets_common().

◆ prepare_input_packet()

static int prepare_input_packet	(	AVFormatContext *	s,
		AVStream *	st,
		AVPacket *	pkt
	)

static

Definition at line 780 of file mux.c.

Referenced by write_packets_common().

◆ ff_interleave_add_packet()

int ff_interleave_add_packet	(	AVFormatContext *	s,
		AVPacket *	pkt,
		int()(AVFormatContext , const AVPacket , const AVPacket )	compare
	)

Add packet to an AVFormatContext's packet_buffer list, determining its interleaved position using compare() function argument.

Returns: 0 on success, < 0 on error. pkt will always be blank on return.

Definition at line 830 of file mux.c.

Referenced by ff_interleave_packet_per_dts(), gxf_interleave_packet(), and mxf_interleave().

◆ interleave_compare_dts()

static int interleave_compare_dts	(	AVFormatContext *	s,
		const AVPacket *	next,
		const AVPacket *	pkt
	)

static

Definition at line 902 of file mux.c.

Referenced by ff_interleave_packet_per_dts().

◆ ff_interleave_packet_per_dts()

int ff_interleave_packet_per_dts	(	AVFormatContext *	s,
		AVPacket *	out,
		AVPacket *	pkt,
		int	flush
	)

Interleave an AVPacket per dts so it can be muxed.

Parameters

s	an AVFormatContext for output. pkt resp. out will be added to resp. taken from its packet buffer.
out	the interleaved packet will be output here
pkt	the input packet; will be blank on return if not NULL
flush	1 if no further packets are available as input and all remaining packets should be output

Returns: 1 if a packet was output, 0 if no packet could be output (in which case out may be uninitialized), < 0 if an error occurred

Definition at line 932 of file mux.c.

Referenced by gxf_interleave_packet(), and interleave_packet().

◆ ff_get_muxer_ts_offset()

int ff_get_muxer_ts_offset	(	AVFormatContext *	s,
		int	stream_index,
		int64_t *	offset
	)

Definition at line 1050 of file mux.c.

Referenced by mov_flush_fragment().

◆ ff_interleaved_peek()

const AVPacket* ff_interleaved_peek	(	AVFormatContext *	s,
		int	stream
	)

Find the next packet in the interleaving queue for the given stream.

Returns: a pointer to a packet if one was found, NULL otherwise.

Definition at line 1066 of file mux.c.

Referenced by mov_flush_fragment().

◆ interleave_packet()

static int interleave_packet	(	AVFormatContext *	s,
		AVPacket *	out,
		AVPacket *	in,
		int	flush
	)

static

Interleave an AVPacket correctly so it can be muxed.

Parameters

out	the interleaved packet will be output here
in	the input packet; will always be blank on return if not NULL
flush	1 if no further packets are available as input and all remaining packets should be output

Returns: 1 if a packet was output, 0 if no packet could be output, < 0 if an error occurred

Definition at line 1087 of file mux.c.

Referenced by interleaved_write_packet().

◆ check_bitstream()

static int check_bitstream	(	AVFormatContext *	s,
		AVStream *	st,
		AVPacket *	pkt
	)

static

Definition at line 1095 of file mux.c.

Referenced by write_packets_common().

◆ interleaved_write_packet()

static int interleaved_write_packet	(	AVFormatContext *	s,
		AVPacket *	pkt,
		int	flush
	)

static

Definition at line 1114 of file mux.c.

Referenced by av_interleaved_write_frame(), av_write_trailer(), and write_packet_common().

◆ write_packet_common()

static int write_packet_common	(	AVFormatContext *	s,
		AVStream *	st,
		AVPacket *	pkt,
		int	interleaved
	)

static

Definition at line 1133 of file mux.c.

Referenced by write_packets_common(), and write_packets_from_bsfs().

◆ write_packets_from_bsfs()

static int write_packets_from_bsfs	(	AVFormatContext *	s,
		AVStream *	st,
		AVPacket *	pkt,
		int	interleaved
	)

static

Definition at line 1157 of file mux.c.

Referenced by av_write_trailer(), and write_packets_common().

◆ write_packets_common()

static int write_packets_common	(	AVFormatContext *	s,
		AVPacket *	pkt,
		int	interleaved
	)

static

Definition at line 1189 of file mux.c.

Referenced by av_interleaved_write_frame(), and av_write_frame().

◆ ff_write_chained()

int ff_write_chained	(	AVFormatContext *	dst,
		int	dst_stream,
		AVPacket *	pkt,
		AVFormatContext *	src,
		int	interleave
	)

Write a packet to another muxer than the one the user originally intended.

Useful when chaining muxers, where one muxer internally writes a received packet to another muxer.

Parameters

dst	the muxer to write the packet to
dst_stream	the stream index within dst to write the packet to
pkt	the packet to be written
src	the muxer the packet originally was intended for
interleave	0->use av_write_frame, 1->av_interleaved_write_frame

Returns: the value av_write_frame returned

Definition at line 1328 of file mux.c.

Referenced by dash_write_packet(), ff_mov_add_hinted_packet(), hds_write_packet(), hls_write_packet(), ism_write_packet(), rtsp_write_packet(), sap_write_packet(), and seg_write_packet().

◆ uncoded_frame_free()

static void uncoded_frame_free	(	void *	unused,
		uint8_t *	data
	)

static

Definition at line 1349 of file mux.c.

Referenced by write_uncoded_frame_internal().

◆ write_uncoded_frame_internal()

static int write_uncoded_frame_internal	(	AVFormatContext *	s,
		int	stream_index,
		AVFrame *	frame,
		int	interleaved
	)

static

Definition at line 1355 of file mux.c.

Referenced by av_interleaved_write_uncoded_frame(), and av_write_uncoded_frame().

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ AV_PKT_FLAG_UNCODED_FRAME

◆ CHUNK_START

Function Documentation

◆ frac_init()

◆ frac_add()

◆ ff_choose_timebase()

◆ ff_choose_chroma_location()

◆ avformat_alloc_output_context2()

◆ validate_codec_tag()

◆ init_muxer()

◆ init_pts()

◆ flush_if_needed()

◆ deinit_muxer()

◆ guess_pkt_duration()

◆ write_packet()

◆ check_packet()

◆ prepare_input_packet()

◆ ff_interleave_add_packet()

◆ interleave_compare_dts()

◆ ff_interleave_packet_per_dts()

◆ ff_get_muxer_ts_offset()

◆ ff_interleaved_peek()

◆ interleave_packet()

◆ check_bitstream()

◆ interleaved_write_packet()

◆ write_packet_common()

◆ write_packets_from_bsfs()

◆ write_packets_common()

◆ ff_write_chained()

◆ uncoded_frame_free()

◆ write_uncoded_frame_internal()