mux.c File Reference

#include "avformat.h"
#include "internal.h"
#include "mux.h"
#include "version.h"
#include "libavcodec/bsf.h"
#include "libavcodec/codec_desc.h"
#include "libavcodec/internal.h"
#include "libavcodec/packet_internal.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/timestamp.h"
#include "libavutil/avassert.h"
#include "libavutil/frame.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"

Go to the source code of this file.

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...
int	avformat_alloc_output_context2 (AVFormatContext **avctx, const AVOutputFormat *oformat, const char *format, const char *filename)
	Allocate an AVFormatContext for an output format. More...
static int	validate_codec_tag (const AVFormatContext *s, const 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 FF_DISABLE_DEPRECATION_WARNINGS int	compute_muxer_pkt_fields (AVFormatContext *s, AVStream *st, AVPacket *pkt)
static FF_ENABLE_DEPRECATION_WARNINGS void	guess_pkt_duration (AVFormatContext *s, AVStream *st, AVPacket *pkt)
static void	handle_avoid_negative_ts (FFFormatContext *si, FFStream *sti, 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 *pkt, int flush, int has_packet)
	Interleave an AVPacket per dts so it can be muxed. More...
int	ff_interleave_packet_passthrough (AVFormatContext *s, AVPacket *pkt, int flush, int has_packet)
	Interleave packets directly in the order in which they arrive without any sort of buffering. 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	check_bitstream (AVFormatContext *s, FFStream *sti, AVPacket *pkt)
static int	interleaved_write_packet (AVFormatContext *s, AVPacket *pkt, int flush, int has_packet)
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_stream_add_bitstream_filter (AVStream *st, const char *name, const char *args)
	Add a bitstream filter to a stream. 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 522 of file mux.c.

CHUNK_START

#define CHUNK_START   0x1000

Definition at line 852 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 55 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 73 of file mux.c.

Referenced by compute_muxer_pkt_fields().

avformat_alloc_output_context2()

int avformat_alloc_output_context2	(	AVFormatContext **	ctx,
		const 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	pointee 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

Examples

mux.c.

Definition at line 93 of file mux.c.

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

validate_codec_tag()

static int validate_codec_tag ( const AVFormatContext *  s, const 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 151 of file mux.c.

Referenced by init_muxer().

init_muxer()

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

static

Definition at line 185 of file mux.c.

Referenced by avformat_init_output().

init_pts()

static int init_pts ( AVFormatContext *  s )

static

Definition at line 402 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 445 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 455 of file mux.c.

Referenced by av_write_trailer(), and avformat_write_header().

compute_muxer_pkt_fields()

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

static

Definition at line 528 of file mux.c.

Referenced by write_packet_common().

guess_pkt_duration()

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

static

Definition at line 624 of file mux.c.

Referenced by write_packet_common().

handle_avoid_negative_ts()

static void handle_avoid_negative_ts ( FFFormatContext *  si, FFStream *  sti, AVPacket *  pkt  )

static

Definition at line 655 of file mux.c.

Referenced by write_packet().

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 741 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 780 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 796 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 854 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 928 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 *	pkt,
		int	flush,
		int	has_packet
	)

Interleave an AVPacket per dts so it can be muxed.

See the documentation of AVOutputFormat.interleave_packet for details.

Definition at line 958 of file mux.c.

Referenced by gxf_interleave_packet(), and init_muxer().

ff_interleave_packet_passthrough()

int ff_interleave_packet_passthrough	(	AVFormatContext *	s,
		AVPacket *	pkt,
		int	flush,
		int	has_packet
	)

Interleave packets directly in the order in which they arrive without any sort of buffering.

Definition at line 1078 of file mux.c.

Referenced by init_muxer().

ff_get_muxer_ts_offset()

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

Definition at line 1084 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 1100 of file mux.c.

Referenced by mov_flush_fragment().

check_bitstream()

static int check_bitstream ( AVFormatContext *  s, FFStream *  sti, AVPacket *  pkt  )

static

Definition at line 1113 of file mux.c.

Referenced by write_packets_common().

interleaved_write_packet()

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

static

Definition at line 1132 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 1150 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 1174 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 1207 of file mux.c.

Referenced by av_interleaved_write_frame(), and av_write_frame().

ff_stream_add_bitstream_filter()

int ff_stream_add_bitstream_filter	(	AVStream *	st,
		const char *	name,
		const char *	args
	)

Add a bitstream filter to a stream.

Parameters

st	output stream to add a filter to
name	the name of the filter to add
args	filter-specific argument string

Returns

>0 on success; AVERROR code on failure

Definition at line 1350 of file mux.c.

Referenced by daud_init(), flv_check_bitstream(), gxf_write_header(), ivf_init(), latm_check_bitstream(), mkv_check_bitstream(), mov_check_bitstream(), mpegts_check_bitstream(), mxf_check_bitstream(), and mxf_init().

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. It will be returned blank when av_interleaved_write_frame() is used, unchanged otherwise.
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 1393 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 1423 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 1429 of file mux.c.

Referenced by av_interleaved_write_uncoded_frame(), and av_write_uncoded_frame().