#include <stdint.h>
#include "libavutil/rational.h"
#include "libavcodec/packet.h"
#include "avformat.h"

Data Structures
struct	FFStreamInfo

Macros
#define	MAX_STD_TIMEBASES (30*12+30+3+6)

#define	FFERROR_REDO FFERRTAG('R','E','D','O')
	Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data). More...

#define	RELATIVE_TS_BASE (INT64_MAX - (1LL << 48))

Functions
static av_always_inline int	is_relative (int64_t ts)

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...

int	ff_read_packet (AVFormatContext s, AVPacket pkt)
	Read a transport packet from a media file. More...

void	ff_read_frame_flush (AVFormatContext *s)
	Flush the frame reader. More...

int	ff_seek_frame_binary (AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
	Perform a binary search using av_index_search_timestamp() and AVInputFormat.read_timestamp(). More...

void	avpriv_update_cur_dts (AVFormatContext s, AVStream ref_st, int64_t timestamp)
	Update cur_dts of all streams based on the given timestamp and AVStream. More...

int	ff_find_last_ts (AVFormatContext s, int stream_index, int64_t ts, int64_t pos, int64_t(read_timestamp)(struct AVFormatContext , int, int64_t , int64_t))

int64_t	ff_gen_search (AVFormatContext s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t ts_ret, int64_t(read_timestamp)(struct AVFormatContext , int, int64_t *, int64_t))
	Perform a binary search using read_timestamp(). More...

int	ff_index_search_timestamp (const AVIndexEntry *entries, int nb_entries, int64_t wanted_timestamp, int flags)
	Internal version of av_index_search_timestamp. More...

int	ff_add_index_entry (AVIndexEntry *index_entries, int nb_index_entries, unsigned int *index_entries_allocated_size, int64_t pos, int64_t timestamp, int size, int distance, int flags)
	Internal version of av_add_index_entry. More...

void	ff_configure_buffers_for_index (AVFormatContext *s, int64_t time_tolerance)

void	ff_reduce_index (AVFormatContext *s, int stream_index)
	Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by discarding entries if it grows too large. More...

int	ff_rfps_add_frame (AVFormatContext ic, AVStream st, int64_t dts)
	add frame for rfps calculation. More...

void	ff_rfps_calculate (AVFormatContext *ic)

void	ff_rescale_interval (AVRational tb_in, AVRational tb_out, int64_t min_ts, int64_t ts, int64_t *max_ts)
	Rescales a timestamp and the endpoints of an interval to which the temstamp belongs, from a timebase `tb_in` to a timebase `tb_out`. More...

void	avpriv_stream_set_need_parsing (AVStream *st, enum AVStreamParseType type)

AVChapter *	avpriv_new_chapter (AVFormatContext s, int64_t id, AVRational time_base, int64_t start, int64_t end, const char title)
	Add a new chapter. More...

int	ff_add_attached_pic (AVFormatContext s, AVStream st, AVIOContext pb, AVBufferRef *buf, int size)
	Add an attached pic to an AVStream. More...

int	ff_add_param_change (AVPacket *pkt, int32_t channels, uint64_t channel_layout, int32_t sample_rate, int32_t width, int32_t height)
	Add side data to a packet for changing parameters to the given values. More...

int	ff_generate_avci_extradata (AVStream *st)
	Generate standard extradata for AVC-Intra based on width/height and field order. More...

int	ff_get_extradata (void logctx, AVCodecParameters par, AVIOContext *pb, int size)
	Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and fill it from pb. More...

int	ff_find_stream_index (const AVFormatContext *s, int id)
	Find stream index based on format-specific stream ID. More...

Macro Definition Documentation

◆ MAX_STD_TIMEBASES

#define MAX_STD_TIMEBASES (30*12+30+3+6)

Definition at line 29 of file demux.h.

◆ FFERROR_REDO

#define FFERROR_REDO FFERRTAG('R','E','D','O')

Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data).

The framework will re-call the demuxer.

Definition at line 62 of file demux.h.

◆ RELATIVE_TS_BASE

#define RELATIVE_TS_BASE (INT64_MAX - (1LL << 48))

Definition at line 64 of file demux.h.

Function Documentation

◆ is_relative()

static av_always_inline int is_relative ( int64_t ts )

static

Definition at line 66 of file demux.h.

Referenced by av_read_frame(), compute_pkt_fields(), ff_add_index_entry(), ff_read_packet(), ff_rfps_add_frame(), read_frame_internal(), and update_initial_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 64 of file demux.c.

Referenced by av_add_index_entry(), and read_timestamp().

◆ 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 537 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().

◆ ff_read_frame_flush()

void ff_read_frame_flush ( AVFormatContext * s )

Flush the frame reader.

Definition at line 715 of file seek.c.

Referenced by asf_read_pts(), avformat_flush(), avformat_seek_file(), dash_seek(), ff_seek_frame_binary(), hls_read_seek(), mpegts_get_dts(), seek_frame_generic(), and seek_frame_internal().

◆ ff_seek_frame_binary()

int ff_seek_frame_binary	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	target_ts,
		int	flags
	)

Perform a binary search using av_index_search_timestamp() and AVInputFormat.read_timestamp().

Parameters

target_ts	target timestamp in the time base of the given stream
stream_index	stream number

Definition at line 283 of file seek.c.

Referenced by asf_read_seek(), ogg_read_seek(), rm_read_seek(), and seek_frame_internal().

◆ avpriv_update_cur_dts()

void avpriv_update_cur_dts	(	AVFormatContext *	s,
		AVStream *	ref_st,
		int64_t	timestamp
	)

Update cur_dts of all streams based on the given timestamp and AVStream.

Stream ref_st unchanged, others set cur_dts in their native time base. Only needed for timestamp wrapping or if (dts not set and pts!=dts).

Parameters

timestamp	new dts expressed in time_base of param ref_st
ref_st	reference stream giving time_base of param timestamp

Definition at line 33 of file seek.c.

Referenced by aa_read_header(), aa_read_seek(), ff_seek_frame_binary(), idcin_read_seek(), mp3_seek(), mpc8_read_seek(), mxf_read_seek(), read_seek(), seek_frame_generic(), and vpk_read_seek().

◆ ff_find_last_ts()

int ff_find_last_ts	(	AVFormatContext *	s,
		int	stream_index,
		int64_t *	ts,
		int64_t *	pos,
		int64_t()(struct AVFormatContext , int, int64_t *, int64_t)	read_timestamp
	)

Definition at line 353 of file seek.c.

Referenced by ff_gen_search(), and find_duration().

◆ ff_gen_search()

int64_t ff_gen_search	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	target_ts,
		int64_t	pos_min,
		int64_t	pos_max,
		int64_t	pos_limit,
		int64_t	ts_min,
		int64_t	ts_max,
		int	flags,
		int64_t *	ts_ret,
		int64_t()(struct AVFormatContext , int, int64_t *, int64_t)	read_timestamp
	)

Perform a binary search using read_timestamp().

Parameters

target_ts	target timestamp in the time base of the given stream
stream_index	stream number

Definition at line 391 of file seek.c.

Referenced by ff_seek_frame_binary(), and read_seek().

◆ ff_index_search_timestamp()

int ff_index_search_timestamp	(	const AVIndexEntry *	entries,
		int	nb_entries,
		int64_t	wanted_timestamp,
		int	flags
	)

Internal version of av_index_search_timestamp.

Definition at line 128 of file seek.c.

Referenced by av_index_search_timestamp(), avformat_index_get_entry_from_timestamp(), ff_add_index_entry(), mxf_read_seek(), and read_seek().

◆ ff_add_index_entry()

int ff_add_index_entry	(	AVIndexEntry **	index_entries,
		int *	nb_index_entries,
		unsigned int *	index_entries_allocated_size,
		int64_t	pos,
		int64_t	timestamp,
		int	size,
		int	distance,
		int	flags
	)

Internal version of av_add_index_entry.

Definition at line 60 of file seek.c.

Referenced by av_add_index_entry(), read_header(), and scan_file().

◆ ff_configure_buffers_for_index()

void ff_configure_buffers_for_index	(	AVFormatContext *	s,
		int64_t	time_tolerance
	)

Definition at line 171 of file seek.c.

Referenced by mov_read_header().

◆ ff_reduce_index()

void ff_reduce_index	(	AVFormatContext *	s,
		int	stream_index
	)

Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by discarding entries if it grows too large.

Definition at line 46 of file seek.c.

Referenced by av_read_frame(), mpegps_read_pes_header(), mpegts_get_dts(), and read_frame_internal().

◆ 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 2173 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 2234 of file demux.c.

Referenced by avformat_find_stream_info(), and mov_read_header().

◆ ff_rescale_interval()

void ff_rescale_interval	(	AVRational	tb_in,
		AVRational	tb_out,
		int64_t *	min_ts,
		int64_t *	ts,
		int64_t *	max_ts
	)

Rescales a timestamp and the endpoints of an interval to which the temstamp belongs, from a timebase tb_in to a timebase tb_out.

The upper (lower) bound of the output interval is rounded up (down) such that the output interval always falls within the intput interval. The timestamp is rounded to the nearest integer and halfway cases away from zero, and can therefore fall outside of the output interval.

Useful to simplify the rescaling of the arguments of AVInputFormat::read_seek2()

Parameters

[in]	tb_in	Timebase of the input `min_ts`, `ts` and `max_ts`
[in]	tb_out	Timebase of the ouput `min_ts`, `ts` and `max_ts`
[in,out]	min_ts	Lower bound of the interval
[in,out]	ts	Timestamp
[in,out]	max_ts	Upper bound of the interval

Definition at line 756 of file seek.c.

Referenced by imf_seek(), main(), real_seek(), and try_seek().

◆ avpriv_stream_set_need_parsing()

void avpriv_stream_set_need_parsing	(	AVStream *	st,
		enum AVStreamParseType	type
	)

Definition at line 37 of file demux_utils.c.

Referenced by v4l2_read_header().

◆ avpriv_new_chapter()

AVChapter* avpriv_new_chapter	(	AVFormatContext *	s,
		int64_t	id,
		AVRational	time_base,
		int64_t	start,
		int64_t	end,
		const char *	title
	)

Add a new chapter.

Parameters

s	media file handle
id	unique ID for this chapter
start	chapter start time in time_base units
end	chapter end time in time_base units
title	chapter title

Returns: AVChapter or NULL on error

Definition at line 42 of file demux_utils.c.

Referenced by aa_read_header(), asf_read_marker(), concat_parse_script(), decode_info_header(), ff_id3v2_parse_chapters(), flac_read_header(), mov_metadata_hmmt(), mov_read_chapters(), mov_read_chpl(), ogm_chapter(), read_chapter(), and read_header().

◆ ff_add_attached_pic()

int ff_add_attached_pic	(	AVFormatContext *	s,
		AVStream *	st,
		AVIOContext *	pb,
		AVBufferRef **	buf,
		int	size
	)

Add an attached pic to an AVStream.

Parameters

st	if set, the stream to add the attached pic to; if unset, a new stream will be added to s.
pb	AVIOContext to read data from if buf is unset.
buf	if set, it contains the data and size information to be used for the attached pic; if unset, data is read from pb.
size	the size of the data to read if buf is unset.

Returns: 0 on success, < 0 on error. On error, this function removes the stream it has added (if any).

Definition at line 116 of file demux_utils.c.

Referenced by ape_tag_read_field(), asf_read_picture(), ff_flac_parse_picture(), ff_id3v2_parse_apic(), get_attachment(), mov_read_chapters(), and mov_read_covr().

◆ ff_add_param_change()

int ff_add_param_change	(	AVPacket *	pkt,
		int32_t	channels,
		uint64_t	channel_layout,
		int32_t	sample_rate,
		int32_t	width,
		int32_t	height
	)

Add side data to a packet for changing parameters to the given values.

Parameters set to 0 aren't included in the change.

Definition at line 151 of file demux_utils.c.

Referenced by flv_read_packet(), load_ipmovie_packet(), and swf_read_packet().

◆ ff_generate_avci_extradata()

int ff_generate_avci_extradata ( AVStream * st )

Generate standard extradata for AVC-Intra based on width/height and field order.

Definition at line 220 of file demux_utils.c.

Referenced by mov_read_trak(), and mxf_parse_structural_metadata().

◆ ff_get_extradata()

int ff_get_extradata	(	void *	logctx,
		AVCodecParameters *	par,
		AVIOContext *	pb,
		int	size
	)

Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and fill it from pb.

Parameters

size	size of extradata

Returns: >= 0 if OK, AVERROR_xxx on error

Definition at line 355 of file demux_utils.c.

Referenced by aax_read_header(), acm_read_header(), adx_read_header(), aiff_read_header(), aix_read_header(), apc_read_header(), ape_tag_read_field(), avi_read_header(), bfi_read_header(), decode_stream_header(), ff_get_wav_header(), ff_mp4_read_dec_config_descr(), flv_get_extradata(), get_codec_data(), idcin_read_header(), mov_parse_stsd_data(), mov_read_dfla(), mov_read_dvc1(), mov_read_glbl(), mov_read_strf(), mov_read_wave(), mpc8_read_header(), mpc_read_header(), parse_video_info(), read_header(), read_kuki_chunk(), rl2_read_header(), rm_read_extradata(), rsd_read_header(), vc1t_read_header(), wsvqa_read_header(), and yop_read_header().

◆ ff_find_stream_index()

int ff_find_stream_index	(	const AVFormatContext *	s,
		int	id
	)

Find stream index based on format-specific stream ID.

Returns: stream index, or < 0 on error

Definition at line 371 of file demux_utils.c.

Referenced by get_sindex(), parse_chunks(), pmt_cb(), and scte_data_cb().

Data Structures

Macros

Functions

Macro Definition Documentation

◆ MAX_STD_TIMEBASES

◆ FFERROR_REDO

◆ RELATIVE_TS_BASE

Function Documentation

◆ is_relative()

◆ ff_wrap_timestamp()

◆ ff_read_packet()

◆ ff_read_frame_flush()

◆ ff_seek_frame_binary()

◆ avpriv_update_cur_dts()

◆ ff_find_last_ts()

◆ ff_gen_search()

◆ ff_index_search_timestamp()

◆ ff_add_index_entry()

◆ ff_configure_buffers_for_index()

◆ ff_reduce_index()

◆ ff_rfps_add_frame()

◆ ff_rfps_calculate()

◆ ff_rescale_interval()

◆ avpriv_stream_set_need_parsing()

◆ avpriv_new_chapter()

◆ ff_add_attached_pic()

◆ ff_add_param_change()

◆ ff_generate_avci_extradata()

◆ ff_get_extradata()

◆ ff_find_stream_index()