#include <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/mathematics.h"
#include "libavutil/mem.h"
#include "libavutil/timestamp.h"
#include "libavcodec/avcodec.h"
#include "avformat.h"
#include "avformat_internal.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"

Functions
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...

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_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...

int	av_add_index_entry (AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
	Add an index entry into a sorted list. 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...

void	ff_configure_buffers_for_index (AVFormatContext *s, int64_t time_tolerance)

int	av_index_search_timestamp (AVStream *st, int64_t wanted_timestamp, int flags)
	Get the index for a specific timestamp. More...

int	avformat_index_get_entries_count (const AVStream *st)
	Get the index entry count for the given AVStream. More...

const AVIndexEntry *	avformat_index_get_entry (AVStream *st, int idx)
	Get the AVIndexEntry corresponding to the given index. More...

const AVIndexEntry *	avformat_index_get_entry_from_timestamp (AVStream *st, int64_t wanted_timestamp, int flags)
	Get the AVIndexEntry corresponding to the given timestamp. More...

static int64_t	read_timestamp (AVFormatContext s, int stream_index, int64_t ppos, int64_t pos_limit, int64_t(read_timestamp)(struct AVFormatContext , int, int64_t *, int64_t))

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 FFInputFormat.read_timestamp(). More...

int	ff_find_last_ts (AVFormatContext s, int stream_index, int64_t ts, int64_t pos, int64_t(read_timestamp_func)(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_func)(struct AVFormatContext , int, int64_t *, int64_t))
	Perform a binary search using read_timestamp(). More...

static int	seek_frame_byte (AVFormatContext *s, int stream_index, int64_t pos, int flags)

static int	seek_frame_generic (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

static int	seek_frame_internal (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

int	av_seek_frame (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
	Seek to the keyframe at timestamp. More...

int	avformat_seek_file (AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
	Seek to timestamp ts. More...

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

int	avformat_flush (AVFormatContext *s)
	Discard all internally buffered data. More...

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...

Function Documentation

◆ 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 37 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_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 50 of file seek.c.

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

◆ 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 64 of file seek.c.

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

◆ 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 132 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_configure_buffers_for_index()

void ff_configure_buffers_for_index	(	AVFormatContext *	s,
		int64_t	time_tolerance
	)

Definition at line 175 of file seek.c.

Referenced by mov_read_header().

◆ read_timestamp()

static int64_t read_timestamp	(	AVFormatContext *	s,
		int	stream_index,
		int64_t *	ppos,
		int64_t	pos_limit,
		int64_t()(struct AVFormatContext , int, int64_t *, int64_t)	read_timestamp
	)

static

Definition at line 281 of file seek.c.

Referenced by ff_find_last_ts(), and ff_gen_search().

◆ 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 FFInputFormat.read_timestamp().

Parameters

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

Definition at line 290 of file seek.c.

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

◆ 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_func
	)

Definition at line 360 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 398 of file seek.c.

Referenced by ff_seek_frame_binary(), and read_seek().

◆ seek_frame_byte()

static int seek_frame_byte	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	pos,
		int	flags
	)

static

Definition at line 505 of file seek.c.

Referenced by seek_frame_internal().

◆ seek_frame_generic()

static int seek_frame_generic	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	timestamp,
		int	flags
	)

static

Definition at line 526 of file seek.c.

Referenced by seek_frame_internal().

◆ seek_frame_internal()

static int seek_frame_internal	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	timestamp,
		int	flags
	)

static

Definition at line 597 of file seek.c.

Referenced by av_seek_frame().

◆ ff_read_frame_flush()

void ff_read_frame_flush ( AVFormatContext * s )

Flush the frame reader.

Definition at line 722 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_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 FFInputFormat::read_seek2()

Parameters

[in]	tb_in	Timebase of the input `min_ts`, `ts` and `max_ts`
[in]	tb_out	Timebase of the output `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 765 of file seek.c.

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

Functions

Function Documentation

◆ avpriv_update_cur_dts()

◆ ff_reduce_index()

◆ ff_add_index_entry()

◆ ff_index_search_timestamp()

◆ ff_configure_buffers_for_index()

◆ read_timestamp()

◆ ff_seek_frame_binary()

◆ ff_find_last_ts()

◆ ff_gen_search()

◆ seek_frame_byte()

◆ seek_frame_generic()

◆ seek_frame_internal()

◆ ff_read_frame_flush()

◆ ff_rescale_interval()