demux.c File Reference

#include <stdint.h>
#include "config_components.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixfmt.h"
#include "libavutil/time.h"
#include "libavutil/timestamp.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/bsf.h"
#include "libavcodec/codec_desc.h"
#include "libavcodec/internal.h"
#include "libavcodec/packet_internal.h"
#include "libavcodec/raw.h"
#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "id3v2.h"
#include "internal.h"
#include "url.h"

Go to the source code of this file.

Macros
#define	DURATION_MAX_READ_SIZE   250000LL
#define	DURATION_MAX_RETRY   6
#define	FAIL(errmsg)

Functions
static int64_t	wrap_timestamp (const AVStream *st, int64_t timestamp)
int64_t	ff_wrap_timestamp (const AVStream *st, int64_t timestamp)
	Wrap a given time stamp, if there is an indication for an overflow. More...
static const AVCodec *	find_probe_decoder (AVFormatContext *s, const AVStream *st, enum AVCodecID codec_id)
static int	set_codec_from_probe_data (AVFormatContext *s, AVStream *st, AVProbeData *pd)
static int	init_input (AVFormatContext *s, const char *filename, AVDictionary **options)
static int	update_stream_avctx (AVFormatContext *s)
int	avformat_open_input (AVFormatContext **ps, const char *filename, const AVInputFormat *fmt, AVDictionary **options)
	Open an input stream and read the header. More...
void	avformat_close_input (AVFormatContext **ps)
	Close an opened input AVFormatContext. More...
static void	force_codec_ids (AVFormatContext *s, AVStream *st)
static int	probe_codec (AVFormatContext *s, AVStream *st, const AVPacket *pkt)
static int	update_wrap_reference (AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
static void	update_timestamps (AVFormatContext *s, AVStream *st, AVPacket *pkt)
static int	handle_new_packet (AVFormatContext *s, AVPacket *pkt, int allow_passthrough)
	Handle a new packet and either return it directly if possible and allow_passthrough is true or queue the packet (or drop the packet if corrupt). More...
int	ff_buffer_packet (AVFormatContext *s, AVPacket *pkt)
int	ff_read_packet (AVFormatContext *s, AVPacket *pkt)
	Read a transport packet from a media file. More...
static void	compute_frame_duration (AVFormatContext *s, int *pnum, int *pden, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)
	Return the frame duration in seconds. More...
static int	has_decode_delay_been_guessed (AVStream *st)
static PacketListEntry *	get_next_pkt (AVFormatContext *s, AVStream *st, PacketListEntry *pktl)
static int64_t	select_from_pts_buffer (AVStream *st, int64_t *pts_buffer, int64_t dts)
static void	update_dts_from_pts (AVFormatContext *s, int stream_index, PacketListEntry *pkt_buffer)
	Updates the dts of packets of a stream in pkt_buffer, by re-ordering the pts of the packets in a window. More...
static void	update_initial_timestamps (AVFormatContext *s, int stream_index, int64_t dts, int64_t pts, AVPacket *pkt)
static void	update_initial_durations (AVFormatContext *s, AVStream *st, int stream_index, int64_t duration)
static void	compute_pkt_fields (AVFormatContext *s, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt, int64_t next_dts, int64_t next_pts)
static int	parse_packet (AVFormatContext *s, AVPacket *pkt, int stream_index, int flush)
	Parse a packet, add all split parts to parse_queue. More...
static int64_t	ts_to_samples (AVStream *st, int64_t ts)
static int	codec_close (FFStream *sti)
static int	read_frame_internal (AVFormatContext *s, AVPacket *pkt)
int	av_read_frame (AVFormatContext *s, AVPacket *pkt)
	Return the next frame of a stream. More...
static int	has_duration (AVFormatContext *ic)
	Return TRUE if the stream has accurate duration in any stream. More...
static void	update_stream_timings (AVFormatContext *ic)
	Estimate the stream timings from the one of each components. More...
static void	fill_all_stream_timings (AVFormatContext *ic)
static void	estimate_timings_from_bit_rate (AVFormatContext *ic)
static void	estimate_timings_from_pts (AVFormatContext *ic, int64_t old_offset)
static const char *	duration_estimate_name (enum AVDurationEstimationMethod method)
static void	estimate_timings (AVFormatContext *ic, int64_t old_offset)
static int	determinable_frame_size (const AVCodecContext *avctx)
static int	has_codec_parameters (const AVStream *st, const char **errmsg_ptr)
static int	try_decode_frame (AVFormatContext *s, AVStream *st, const AVPacket *pkt, AVDictionary **options)
static int	chapter_start_cmp (const void *p1, const void *p2)
static int	compute_chapters_end (AVFormatContext *s)
static int	get_std_framerate (int i)
static int	tb_unreliable (AVFormatContext *ic, AVStream *st)
int	ff_rfps_add_frame (AVFormatContext *ic, AVStream *st, int64_t ts)
	add frame for rfps calculation. More...
void	ff_rfps_calculate (AVFormatContext *ic)
static int	extract_extradata_check (AVStream *st)
static int	extract_extradata_init (AVStream *st)
static int	extract_extradata (FFFormatContext *si, AVStream *st, const AVPacket *pkt)
int	avformat_find_stream_info (AVFormatContext *ic, AVDictionary **options)
	Read packets of a media file to get stream information. More...

Variables
static const char *const	duration_name []

Macro Definition Documentation

DURATION_MAX_READ_SIZE

#define DURATION_MAX_READ_SIZE   250000LL

Definition at line 1806 of file demux.c.

DURATION_MAX_RETRY

#define DURATION_MAX_RETRY   6

Definition at line 1807 of file demux.c.

FAIL

#define FAIL

(

errmsg

)

Value:

        do {                                         \
        if (errmsg_ptr)                                           \
            *errmsg_ptr = errmsg;                                 \
        return 0;                                                 \
    } while (0)

Function Documentation

wrap_timestamp()

static int64_t wrap_timestamp ( const AVStream *  st, int64_t  timestamp  )

static

Definition at line 51 of file demux.c.

Referenced by ff_wrap_timestamp(), and update_timestamps().

ff_wrap_timestamp()

int64_t ff_wrap_timestamp	(	const AVStream *	st,
		int64_t	timestamp
	)

Wrap a given time stamp, if there is an indication for an overflow.

Parameters

st	stream
timestamp	the time stamp to wrap

Returns

resulting time stamp

Definition at line 66 of file demux.c.

Referenced by av_add_index_entry(), and read_timestamp().

find_probe_decoder()

static const AVCodec* find_probe_decoder ( AVFormatContext *  s, const AVStream *  st, enum AVCodecID  codec_id  )

static

Definition at line 71 of file demux.c.

Referenced by avformat_find_stream_info(), and try_decode_frame().

set_codec_from_probe_data()

static int set_codec_from_probe_data ( AVFormatContext *  s, AVStream *  st, AVProbeData *  pd  )

static

Definition at line 101 of file demux.c.

Referenced by probe_codec().

init_input()

static int init_input ( AVFormatContext *  s, const char *  filename, AVDictionary **  options  )

static

Definition at line 155 of file demux.c.

Referenced by avformat_open_input().

update_stream_avctx()

static int update_stream_avctx ( AVFormatContext *  s )

static

Definition at line 186 of file demux.c.

Referenced by avformat_open_input().

force_codec_ids()

static void force_codec_ids ( AVFormatContext *  s, AVStream *  st  )

static

Definition at line 388 of file demux.c.

Referenced by probe_codec(), and update_timestamps().

probe_codec()

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

static

Definition at line 410 of file demux.c.

Referenced by ff_read_packet(), find_probe_decoder(), and handle_new_packet().

update_wrap_reference()

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

static

Definition at line 463 of file demux.c.

Referenced by update_timestamps().

update_timestamps()

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

static

Definition at line 531 of file demux.c.

Referenced by handle_new_packet().

handle_new_packet()

static int handle_new_packet ( AVFormatContext *  s, AVPacket *  pkt, int  allow_passthrough  )

static

Handle a new packet and either return it directly if possible and allow_passthrough is true or queue the packet (or drop the packet if corrupt).

Returns

< 0 on error, 0 if the packet was passed through, 1 if it was queued or dropped

Definition at line 563 of file demux.c.

Referenced by ff_buffer_packet(), and ff_read_packet().

ff_buffer_packet()

int ff_buffer_packet	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

Definition at line 608 of file demux.c.

Referenced by mov_read_packet().

ff_read_packet()

int ff_read_packet	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

Read a transport packet from a media file.

Parameters

s	media file handle
pkt	is filled

Returns

0 if OK, AVERROR_xxx on error

Definition at line 615 of file demux.c.

Referenced by asfrtp_parse_packet(), estimate_timings_from_pts(), get_subtitle_pkt(), read_frame_internal(), read_gab2_sub(), and seek_subtitle().

compute_frame_duration()

static void compute_frame_duration ( AVFormatContext *  s, int *  pnum, int *  pden, AVStream *  st, AVCodecParserContext *  pc, AVPacket *  pkt  )

static

Return the frame duration in seconds.

Return 0 if not available.

Definition at line 682 of file demux.c.

Referenced by compute_pkt_fields(), and estimate_timings_from_pts().

has_decode_delay_been_guessed()

static int has_decode_delay_been_guessed ( AVStream *  st )

static

Definition at line 745 of file demux.c.

Referenced by avformat_find_stream_info(), compute_pkt_fields(), try_decode_frame(), and update_initial_timestamps().

get_next_pkt()

static PacketListEntry* get_next_pkt ( AVFormatContext *  s, AVStream *  st, PacketListEntry *  pktl  )

static

Definition at line 764 of file demux.c.

Referenced by update_dts_from_pts(), update_initial_durations(), and update_initial_timestamps().

select_from_pts_buffer()

static int64_t select_from_pts_buffer ( AVStream *  st, int64_t *  pts_buffer, int64_t  dts  )

static

Definition at line 775 of file demux.c.

Referenced by compute_pkt_fields(), and update_dts_from_pts().

update_dts_from_pts()

static void update_dts_from_pts ( AVFormatContext *  s, int  stream_index, PacketListEntry *  pkt_buffer  )

static

Updates the dts of packets of a stream in pkt_buffer, by re-ordering the pts of the packets in a window.

Definition at line 823 of file demux.c.

Referenced by avformat_find_stream_info(), and update_initial_timestamps().

update_initial_timestamps()

static void update_initial_timestamps ( AVFormatContext *  s, int  stream_index, int64_t  dts, int64_t  pts, AVPacket *  pkt  )

static

Definition at line 848 of file demux.c.

Referenced by compute_pkt_fields().

update_initial_durations()

static void update_initial_durations ( AVFormatContext *  s, AVStream *  st, int  stream_index, int64_t  duration  )

static

Definition at line 901 of file demux.c.

Referenced by compute_pkt_fields().

compute_pkt_fields()

static void compute_pkt_fields ( AVFormatContext *  s, AVStream *  st, AVCodecParserContext *  pc, AVPacket *  pkt, int64_t  next_dts, int64_t  next_pts  )

static

Definition at line 960 of file demux.c.

Referenced by parse_packet(), and read_frame_internal().

parse_packet()

static int parse_packet ( AVFormatContext *  s, AVPacket *  pkt, int  stream_index, int  flush  )

static

Parse a packet, add all split parts to parse_queue.

Parameters

pkt	Packet to parse; must not be NULL.
flush	Indicates whether to flush. If set, pkt must be blank.

Definition at line 1154 of file demux.c.

Referenced by read_frame_internal().

ts_to_samples()

static int64_t ts_to_samples ( AVStream *  st, int64_t  ts  )

static

Definition at line 1269 of file demux.c.

Referenced by read_frame_internal().

codec_close()

static int codec_close ( FFStream *  sti )

static

Definition at line 1274 of file demux.c.

Referenced by avformat_find_stream_info(), and read_frame_internal().

read_frame_internal()

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

static

Definition at line 1321 of file demux.c.

Referenced by av_read_frame(), and avformat_find_stream_info().

has_duration()

static int has_duration ( AVFormatContext *  ic )

static

Return TRUE if the stream has accurate duration in any stream.

Returns

TRUE if the stream has accurate duration for at least one component.

Definition at line 1625 of file demux.c.

Referenced by estimate_timings().

update_stream_timings()

static void update_stream_timings ( AVFormatContext *  ic )

static

Estimate the stream timings from the one of each components.

Also computes the global bitrate if possible.

Definition at line 1642 of file demux.c.

Referenced by estimate_timings(), and fill_all_stream_timings().

fill_all_stream_timings()

static void fill_all_stream_timings ( AVFormatContext *  ic )

static

Definition at line 1736 of file demux.c.

Referenced by estimate_timings(), and estimate_timings_from_pts().

estimate_timings_from_bit_rate()

static void estimate_timings_from_bit_rate ( AVFormatContext *  ic )

static

Definition at line 1753 of file demux.c.

Referenced by estimate_timings().

estimate_timings_from_pts()

static void estimate_timings_from_pts ( AVFormatContext *  ic, int64_t  old_offset  )

static

Definition at line 1810 of file demux.c.

Referenced by estimate_timings().

duration_estimate_name()

static const char* duration_estimate_name ( enum AVDurationEstimationMethod  method )

static

Definition at line 1956 of file demux.c.

Referenced by estimate_timings().

estimate_timings()

static void estimate_timings ( AVFormatContext *  ic, int64_t  old_offset  )

static

Definition at line 1961 of file demux.c.

Referenced by avformat_find_stream_info().

determinable_frame_size()

static int determinable_frame_size ( const AVCodecContext *  avctx )

static

Definition at line 2010 of file demux.c.

Referenced by has_codec_parameters().

has_codec_parameters()

static int has_codec_parameters ( const AVStream *  st, const char **  errmsg_ptr  )

static

Definition at line 2023 of file demux.c.

Referenced by avformat_find_stream_info(), and try_decode_frame().

try_decode_frame()

static int try_decode_frame ( AVFormatContext *  s, AVStream *  st, const AVPacket *  pkt, AVDictionary **  options  )

static

Definition at line 2072 of file demux.c.

Referenced by avformat_find_stream_info().

chapter_start_cmp()

static int chapter_start_cmp ( const void *  p1, const void *  p2  )

static

Definition at line 2174 of file demux.c.

Referenced by compute_chapters_end().

compute_chapters_end()

static int compute_chapters_end ( AVFormatContext *  s )

static

Definition at line 2184 of file demux.c.

Referenced by avformat_find_stream_info().

get_std_framerate()

static int get_std_framerate ( int  i )

static

Definition at line 2221 of file demux.c.

Referenced by avformat_find_stream_info(), ff_rfps_add_frame(), and ff_rfps_calculate().

tb_unreliable()

static int tb_unreliable ( AVFormatContext *  ic, AVStream *  st  )

static

Definition at line 2245 of file demux.c.

Referenced by avformat_find_stream_info(), and ff_rfps_calculate().

ff_rfps_add_frame()

int ff_rfps_add_frame	(	AVFormatContext *	ic,
		AVStream *	st,
		int64_t	dts
	)

add frame for rfps calculation.

Parameters

dts	timestamp of the i-th frame

Returns

0 if OK, AVERROR_xxx on error

Definition at line 2270 of file demux.c.

Referenced by avformat_find_stream_info(), and mov_build_index().

ff_rfps_calculate()

void ff_rfps_calculate

(

AVFormatContext *

ic

)

Definition at line 2331 of file demux.c.

Referenced by avformat_find_stream_info(), and mov_read_header().

extract_extradata_check()

static int extract_extradata_check ( AVStream *  st )

static

Definition at line 2395 of file demux.c.

Referenced by avformat_find_stream_info(), and extract_extradata_init().

extract_extradata_init()

static int extract_extradata_init ( AVStream *  st )

static

Definition at line 2411 of file demux.c.

Referenced by extract_extradata().

extract_extradata()

static int extract_extradata ( FFFormatContext *  si, AVStream *  st, const AVPacket *  pkt  )

static

Definition at line 2450 of file demux.c.

Referenced by avformat_find_stream_info().

Variable Documentation

duration_name

const char* const duration_name[]

static

Initial value:

= {
    [AVFMT_DURATION_FROM_PTS]     = "pts",
    [AVFMT_DURATION_FROM_STREAM]  = "stream",
    [AVFMT_DURATION_FROM_BITRATE] = "bit rate",
}

Definition at line 1950 of file demux.c.

Referenced by duration_estimate_name().