seek.c File Reference

#include <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/mathematics.h"
#include "libavutil/timestamp.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"

Go to the source code of this file.

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 AVInputFormat.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...

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 32 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 45 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 59 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 127 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 170 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 273 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 AVInputFormat.read_timestamp().

Parameters

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

Definition at line 282 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 352 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 390 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 497 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 518 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 589 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 714 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().