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ffmpeg/libavformat/seek.c

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/*
* Seeking and index-related functions
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#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 "avio_internal.h"
#include "demux.h"
#include "internal.h"
void avpriv_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
{
for (unsigned i = 0; i < s->nb_streams; i++) {
AVStream *const st = s->streams[i];
FFStream *const sti = ffstream(st);
sti->cur_dts =
av_rescale(timestamp,
st->time_base.den * (int64_t) ref_st->time_base.num,
st->time_base.num * (int64_t) ref_st->time_base.den);
}
}
void ff_reduce_index(AVFormatContext *s, int stream_index)
{
AVStream *const st = s->streams[stream_index];
FFStream *const sti = ffstream(st);
unsigned int max_entries = s->max_index_size / sizeof(AVIndexEntry);
if ((unsigned) sti->nb_index_entries >= max_entries) {
int i;
for (i = 0; 2 * i < sti->nb_index_entries; i++)
sti->index_entries[i] = sti->index_entries[2 * i];
sti->nb_index_entries = i;
}
}
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)
{
AVIndexEntry *entries, *ie;
int index;
if ((unsigned) *nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
return -1;
if (timestamp == AV_NOPTS_VALUE)
return AVERROR(EINVAL);
if (size < 0 || size > 0x3FFFFFFF)
return AVERROR(EINVAL);
if (is_relative(timestamp)) //FIXME this maintains previous behavior but we should shift by the correct offset once known
timestamp -= RELATIVE_TS_BASE;
entries = av_fast_realloc(*index_entries,
index_entries_allocated_size,
(*nb_index_entries + 1) *
sizeof(AVIndexEntry));
if (!entries)
return -1;
*index_entries = entries;
index = ff_index_search_timestamp(*index_entries, *nb_index_entries,
timestamp, AVSEEK_FLAG_ANY);
if (index < 0) {
index = (*nb_index_entries)++;
ie = &entries[index];
av_assert0(index == 0 || ie[-1].timestamp < timestamp);
} else {
ie = &entries[index];
if (ie->timestamp != timestamp) {
if (ie->timestamp <= timestamp)
return -1;
memmove(entries + index + 1, entries + index,
sizeof(AVIndexEntry) * (*nb_index_entries - index));
(*nb_index_entries)++;
} else if (ie->pos == pos && distance < ie->min_distance)
// do not reduce the distance
distance = ie->min_distance;
}
ie->pos = pos;
ie->timestamp = timestamp;
ie->min_distance = distance;
ie->size = size;
ie->flags = flags;
return index;
}
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
int size, int distance, int flags)
{
FFStream *const sti = ffstream(st);
timestamp = ff_wrap_timestamp(st, timestamp);
return ff_add_index_entry(&sti->index_entries, &sti->nb_index_entries,
&sti->index_entries_allocated_size, pos,
timestamp, size, distance, flags);
}
int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
int64_t wanted_timestamp, int flags)
{
int a, b, m;
int64_t timestamp;
a = -1;
b = nb_entries;
// Optimize appending index entries at the end.
if (b && entries[b - 1].timestamp < wanted_timestamp)
a = b - 1;
while (b - a > 1) {
m = (a + b) >> 1;
// Search for the next non-discarded packet.
while ((entries[m].flags & AVINDEX_DISCARD_FRAME) && m < b && m < nb_entries - 1) {
m++;
if (m == b && entries[m].timestamp >= wanted_timestamp) {
m = b - 1;
break;
}
}
timestamp = entries[m].timestamp;
if (timestamp >= wanted_timestamp)
b = m;
if (timestamp <= wanted_timestamp)
a = m;
}
m = (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
if (!(flags & AVSEEK_FLAG_ANY))
while (m >= 0 && m < nb_entries &&
!(entries[m].flags & AVINDEX_KEYFRAME))
m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
if (m == nb_entries)
return -1;
return m;
}
void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
{
int64_t pos_delta = 0;
int64_t skip = 0;
//We could use URLProtocol flags here but as many user applications do not use URLProtocols this would be unreliable
const char *proto = avio_find_protocol_name(s->url);
FFIOContext *ctx;
av_assert0(time_tolerance >= 0);
if (!proto) {
av_log(s, AV_LOG_INFO,
"Protocol name not provided, cannot determine if input is local or "
"a network protocol, buffers and access patterns cannot be configured "
"optimally without knowing the protocol\n");
}
if (proto && !(strcmp(proto, "file") && strcmp(proto, "pipe") && strcmp(proto, "cache")))
return;
for (unsigned ist1 = 0; ist1 < s->nb_streams; ist1++) {
AVStream *const st1 = s->streams[ist1];
FFStream *const sti1 = ffstream(st1);
for (unsigned ist2 = 0; ist2 < s->nb_streams; ist2++) {
AVStream *const st2 = s->streams[ist2];
FFStream *const sti2 = ffstream(st2);
if (ist1 == ist2)
continue;
for (int i1 = 0, i2 = 0; i1 < sti1->nb_index_entries; i1++) {
const AVIndexEntry *const e1 = &sti1->index_entries[i1];
int64_t e1_pts = av_rescale_q(e1->timestamp, st1->time_base, AV_TIME_BASE_Q);
if (e1->size < (1 << 23))
skip = FFMAX(skip, e1->size);
for (; i2 < sti2->nb_index_entries; i2++) {
const AVIndexEntry *const e2 = &sti2->index_entries[i2];
int64_t e2_pts = av_rescale_q(e2->timestamp, st2->time_base, AV_TIME_BASE_Q);
int64_t cur_delta;
if (e2_pts < e1_pts || e2_pts - (uint64_t)e1_pts < time_tolerance)
continue;
cur_delta = FFABS(e1->pos - e2->pos);
if (cur_delta < (1 << 23))
pos_delta = FFMAX(pos_delta, cur_delta);
break;
}
}
}
}
pos_delta *= 2;
ctx = ffiocontext(s->pb);
/* XXX This could be adjusted depending on protocol*/
if (s->pb->buffer_size < pos_delta) {
av_log(s, AV_LOG_VERBOSE, "Reconfiguring buffers to size %"PRId64"\n", pos_delta);
/* realloc the buffer and the original data will be retained */
if (ffio_realloc_buf(s->pb, pos_delta)) {
av_log(s, AV_LOG_ERROR, "Realloc buffer fail.\n");
return;
}
ctx->short_seek_threshold = FFMAX(ctx->short_seek_threshold, pos_delta/2);
}
ctx->short_seek_threshold = FFMAX(ctx->short_seek_threshold, skip);
}
int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp, int flags)
{
const FFStream *const sti = ffstream(st);
return ff_index_search_timestamp(sti->index_entries, sti->nb_index_entries,
wanted_timestamp, flags);
}
int avformat_index_get_entries_count(const AVStream *st)
{
return cffstream(st)->nb_index_entries;
}
const AVIndexEntry *avformat_index_get_entry(AVStream *st, int idx)
{
const FFStream *const sti = ffstream(st);
if (idx < 0 || idx >= sti->nb_index_entries)
return NULL;
return &sti->index_entries[idx];
}
const AVIndexEntry *avformat_index_get_entry_from_timestamp(AVStream *st,
int64_t wanted_timestamp,
int flags)
{
const FFStream *const sti = ffstream(st);
int idx = ff_index_search_timestamp(sti->index_entries,
sti->nb_index_entries,
wanted_timestamp, flags);
if (idx < 0)
return NULL;
return &sti->index_entries[idx];
}
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 ))
{
int64_t ts = read_timestamp(s, stream_index, ppos, pos_limit);
if (stream_index >= 0)
ts = ff_wrap_timestamp(s->streams[stream_index], ts);
return ts;
}
int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
int64_t target_ts, int flags)
{
const FFInputFormat *const avif = ffifmt(s->iformat);
int64_t pos_min = 0, pos_max = 0, pos, pos_limit;
int64_t ts_min, ts_max, ts;
int index;
int64_t ret;
AVStream *st;
FFStream *sti;
if (stream_index < 0)
return -1;
av_log(s, AV_LOG_TRACE, "read_seek: %d %s\n", stream_index, av_ts2str(target_ts));
ts_max =
ts_min = AV_NOPTS_VALUE;
pos_limit = -1; // GCC falsely says it may be uninitialized.
st = s->streams[stream_index];
sti = ffstream(st);
if (sti->index_entries) {
const AVIndexEntry *e;
/* FIXME: Whole function must be checked for non-keyframe entries in
* index case, especially read_timestamp(). */
index = av_index_search_timestamp(st, target_ts,
flags | AVSEEK_FLAG_BACKWARD);
index = FFMAX(index, 0);
e = &sti->index_entries[index];
if (e->timestamp <= target_ts || e->pos == e->min_distance) {
pos_min = e->pos;
ts_min = e->timestamp;
av_log(s, AV_LOG_TRACE, "using cached pos_min=0x%"PRIx64" dts_min=%s\n",
pos_min, av_ts2str(ts_min));
} else {
av_assert1(index == 0);
}
index = av_index_search_timestamp(st, target_ts,
flags & ~AVSEEK_FLAG_BACKWARD);
av_assert0(index < sti->nb_index_entries);
if (index >= 0) {
e = &sti->index_entries[index];
av_assert1(e->timestamp >= target_ts);
pos_max = e->pos;
ts_max = e->timestamp;
pos_limit = pos_max - e->min_distance;
av_log(s, AV_LOG_TRACE, "using cached pos_max=0x%"PRIx64" pos_limit=0x%"PRIx64
" dts_max=%s\n", pos_max, pos_limit, av_ts2str(ts_max));
}
}
pos = ff_gen_search(s, stream_index, target_ts, pos_min, pos_max, pos_limit,
ts_min, ts_max, flags, &ts, avif->read_timestamp);
if (pos < 0)
return -1;
/* do the seek */
if ((ret = avio_seek(s->pb, pos, SEEK_SET)) < 0)
return ret;
ff_read_frame_flush(s);
avpriv_update_cur_dts(s, st, ts);
return 0;
}
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 step = 1024;
int64_t limit, ts_max;
int64_t filesize = avio_size(s->pb);
int64_t pos_max = filesize - 1;
do {
limit = pos_max;
pos_max = FFMAX(0, (pos_max) - step);
ts_max = read_timestamp(s, stream_index,
&pos_max, limit, read_timestamp_func);
step += step;
} while (ts_max == AV_NOPTS_VALUE && 2*limit > step);
if (ts_max == AV_NOPTS_VALUE)
return -1;
for (;;) {
int64_t tmp_pos = pos_max + 1;
int64_t tmp_ts = read_timestamp(s, stream_index,
&tmp_pos, INT64_MAX, read_timestamp_func);
if (tmp_ts == AV_NOPTS_VALUE)
break;
av_assert0(tmp_pos > pos_max);
ts_max = tmp_ts;
pos_max = tmp_pos;
if (tmp_pos >= filesize)
break;
}
if (ts)
*ts = ts_max;
if (pos)
*pos = pos_max;
return 0;
}
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))
{
FFFormatContext *const si = ffformatcontext(s);
int64_t pos, ts;
int64_t start_pos;
int no_change;
int ret;
av_log(s, AV_LOG_TRACE, "gen_seek: %d %s\n", stream_index, av_ts2str(target_ts));
if (ts_min == AV_NOPTS_VALUE) {
pos_min = si->data_offset;
ts_min = read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp_func);
if (ts_min == AV_NOPTS_VALUE)
return -1;
}
if (ts_min >= target_ts) {
*ts_ret = ts_min;
return pos_min;
}
if (ts_max == AV_NOPTS_VALUE) {
if ((ret = ff_find_last_ts(s, stream_index, &ts_max, &pos_max, read_timestamp_func)) < 0)
return ret;
pos_limit = pos_max;
}
if (ts_max <= target_ts) {
*ts_ret = ts_max;
return pos_max;
}
av_assert0(ts_min < ts_max);
no_change = 0;
while (pos_min < pos_limit) {
av_log(s, AV_LOG_TRACE,
"pos_min=0x%"PRIx64" pos_max=0x%"PRIx64" dts_min=%s dts_max=%s\n",
pos_min, pos_max, av_ts2str(ts_min), av_ts2str(ts_max));
av_assert0(pos_limit <= pos_max);
if (no_change == 0) {
int64_t approximate_keyframe_distance = pos_max - pos_limit;
// interpolate position (better than dichotomy)
pos = av_rescale(target_ts - ts_min, pos_max - pos_min,
ts_max - ts_min) +
pos_min - approximate_keyframe_distance;
} else if (no_change == 1) {
// bisection if interpolation did not change min / max pos last time
pos = (pos_min + pos_limit) >> 1;
} else {
/* linear search if bisection failed, can only happen if there
* are very few or no keyframes between min/max */
pos = pos_min;
}
if (pos <= pos_min)
pos = pos_min + 1;
else if (pos > pos_limit)
pos = pos_limit;
start_pos = pos;
// May pass pos_limit instead of -1.
ts = read_timestamp(s, stream_index, &pos, INT64_MAX, read_timestamp_func);
if (pos == pos_max)
no_change++;
else
no_change = 0;
av_log(s, AV_LOG_TRACE, "%"PRId64" %"PRId64" %"PRId64" / %s %s %s"
" target:%s limit:%"PRId64" start:%"PRId64" noc:%d\n",
pos_min, pos, pos_max,
av_ts2str(ts_min), av_ts2str(ts), av_ts2str(ts_max), av_ts2str(target_ts),
pos_limit, start_pos, no_change);
if (ts == AV_NOPTS_VALUE) {
av_log(s, AV_LOG_ERROR, "read_timestamp() failed in the middle\n");
return -1;
}
if (target_ts <= ts) {
pos_limit = start_pos - 1;
pos_max = pos;
ts_max = ts;
}
if (target_ts >= ts) {
pos_min = pos;
ts_min = ts;
}
}
pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
#if 0
pos_min = pos;
ts_min = read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp_func);
pos_min++;
ts_max = read_timestamp(s, stream_index, &pos_min, INT64_MAX, read_timestamp_func);
av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" %s<=%s<=%s\n",
pos, av_ts2str(ts_min), av_ts2str(target_ts), av_ts2str(ts_max));
#endif
*ts_ret = ts;
return pos;
}
static int seek_frame_byte(AVFormatContext *s, int stream_index,
int64_t pos, int flags)
{
FFFormatContext *const si = ffformatcontext(s);
int64_t pos_min, pos_max;
pos_min = si->data_offset;
pos_max = avio_size(s->pb) - 1;
if (pos < pos_min)
pos = pos_min;
else if (pos > pos_max)
pos = pos_max;
avio_seek(s->pb, pos, SEEK_SET);
s->io_repositioned = 1;
return 0;
}
static int seek_frame_generic(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
FFFormatContext *const si = ffformatcontext(s);
AVStream *const st = s->streams[stream_index];
FFStream *const sti = ffstream(st);
const AVIndexEntry *ie;
int index;
int64_t ret;
index = av_index_search_timestamp(st, timestamp, flags);
if (index < 0 && sti->nb_index_entries &&
timestamp < sti->index_entries[0].timestamp)
return -1;
if (index < 0 || index == sti->nb_index_entries - 1) {
AVPacket *const pkt = si->pkt;
int nonkey = 0;
if (sti->nb_index_entries) {
av_assert0(sti->index_entries);
ie = &sti->index_entries[sti->nb_index_entries - 1];
if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
return ret;
s->io_repositioned = 1;
avpriv_update_cur_dts(s, st, ie->timestamp);
} else {
if ((ret = avio_seek(s->pb, si->data_offset, SEEK_SET)) < 0)
return ret;
s->io_repositioned = 1;
}
av_packet_unref(pkt);
for (;;) {
int read_status;
do {
read_status = av_read_frame(s, pkt);
} while (read_status == AVERROR(EAGAIN));
if (read_status < 0)
break;
if (stream_index == pkt->stream_index && pkt->dts > timestamp) {
if (pkt->flags & AV_PKT_FLAG_KEY) {
av_packet_unref(pkt);
break;
}
if (nonkey++ > 1000 && st->codecpar->codec_id != AV_CODEC_ID_CDGRAPHICS) {
av_log(s, AV_LOG_ERROR,"seek_frame_generic failed as this stream seems to contain no keyframes after the target timestamp, %d non keyframes found\n", nonkey);
av_packet_unref(pkt);
break;
}
}
av_packet_unref(pkt);
}
index = av_index_search_timestamp(st, timestamp, flags);
}
if (index < 0)
return -1;
ff_read_frame_flush(s);
if (ffifmt(s->iformat)->read_seek)
if (ffifmt(s->iformat)->read_seek(s, stream_index, timestamp, flags) >= 0)
return 0;
ie = &sti->index_entries[index];
if ((ret = avio_seek(s->pb, ie->pos, SEEK_SET)) < 0)
return ret;
s->io_repositioned = 1;
avpriv_update_cur_dts(s, st, ie->timestamp);
return 0;
}
static int seek_frame_internal(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
AVStream *st;
int ret;
if (flags & AVSEEK_FLAG_BYTE) {
if (s->iformat->flags & AVFMT_NO_BYTE_SEEK)
return -1;
ff_read_frame_flush(s);
return seek_frame_byte(s, stream_index, timestamp, flags);
}
if (stream_index < 0) {
stream_index = av_find_default_stream_index(s);
if (stream_index < 0)
return -1;
st = s->streams[stream_index];
/* timestamp for default must be expressed in AV_TIME_BASE units */
timestamp = av_rescale(timestamp, st->time_base.den,
AV_TIME_BASE * (int64_t) st->time_base.num);
}
/* first, we try the format specific seek */
if (ffifmt(s->iformat)->read_seek) {
ff_read_frame_flush(s);
ret = ffifmt(s->iformat)->read_seek(s, stream_index, timestamp, flags);
} else
ret = -1;
if (ret >= 0)
return 0;
if (ffifmt(s->iformat)->read_timestamp &&
!(s->iformat->flags & AVFMT_NOBINSEARCH)) {
ff_read_frame_flush(s);
return ff_seek_frame_binary(s, stream_index, timestamp, flags);
} else if (!(s->iformat->flags & AVFMT_NOGENSEARCH)) {
ff_read_frame_flush(s);
return seek_frame_generic(s, stream_index, timestamp, flags);
} else
return -1;
}
int av_seek_frame(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
int ret;
if (ffifmt(s->iformat)->read_seek2 && !ffifmt(s->iformat)->read_seek) {
int64_t min_ts = INT64_MIN, max_ts = INT64_MAX;
if ((flags & AVSEEK_FLAG_BACKWARD))
max_ts = timestamp;
else
min_ts = timestamp;
return avformat_seek_file(s, stream_index, min_ts, timestamp, max_ts,
flags & ~AVSEEK_FLAG_BACKWARD);
}
ret = seek_frame_internal(s, stream_index, timestamp, flags);
if (ret >= 0)
ret = avformat_queue_attached_pictures(s);
return ret;
}
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts,
int64_t ts, int64_t max_ts, int flags)
{
if (min_ts > ts || max_ts < ts)
return -1;
if (stream_index < -1 || stream_index >= (int)s->nb_streams)
return AVERROR(EINVAL);
if (s->seek2any > 0)
flags |= AVSEEK_FLAG_ANY;
flags &= ~AVSEEK_FLAG_BACKWARD;
if (ffifmt(s->iformat)->read_seek2) {
int ret;
ff_read_frame_flush(s);
if (stream_index == -1 && s->nb_streams == 1) {
AVRational time_base = s->streams[0]->time_base;
ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
min_ts = av_rescale_rnd(min_ts, time_base.den,
time_base.num * (int64_t)AV_TIME_BASE,
AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
max_ts = av_rescale_rnd(max_ts, time_base.den,
time_base.num * (int64_t)AV_TIME_BASE,
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
stream_index = 0;
}
ret = ffifmt(s->iformat)->read_seek2(s, stream_index, min_ts,
ts, max_ts, flags);
if (ret >= 0)
ret = avformat_queue_attached_pictures(s);
return ret;
}
if (ffifmt(s->iformat)->read_timestamp) {
// try to seek via read_timestamp()
}
// Fall back on old API if new is not implemented but old is.
// Note the old API has somewhat different semantics.
if (ffifmt(s->iformat)->read_seek || 1) {
int dir = (ts - (uint64_t)min_ts > (uint64_t)max_ts - ts ? AVSEEK_FLAG_BACKWARD : 0);
int ret = av_seek_frame(s, stream_index, ts, flags | dir);
if (ret < 0 && ts != min_ts && max_ts != ts) {
ret = av_seek_frame(s, stream_index, dir ? max_ts : min_ts, flags | dir);
if (ret >= 0)
ret = av_seek_frame(s, stream_index, ts, flags | (dir^AVSEEK_FLAG_BACKWARD));
}
return ret;
}
// try some generic seek like seek_frame_generic() but with new ts semantics
return -1; //unreachable
}
/** Flush the frame reader. */
void ff_read_frame_flush(AVFormatContext *s)
{
FFFormatContext *const si = ffformatcontext(s);
ff_flush_packet_queue(s);
/* Reset read state for each stream. */
for (unsigned i = 0; i < s->nb_streams; i++) {
AVStream *const st = s->streams[i];
FFStream *const sti = ffstream(st);
if (sti->parser) {
av_parser_close(sti->parser);
sti->parser = NULL;
}
sti->last_IP_pts = AV_NOPTS_VALUE;
sti->last_dts_for_order_check = AV_NOPTS_VALUE;
if (sti->first_dts == AV_NOPTS_VALUE)
sti->cur_dts = RELATIVE_TS_BASE;
else
/* We set the current DTS to an unspecified origin. */
sti->cur_dts = AV_NOPTS_VALUE;
sti->probe_packets = s->max_probe_packets;
for (int j = 0; j < MAX_REORDER_DELAY + 1; j++)
sti->pts_buffer[j] = AV_NOPTS_VALUE;
#if FF_API_AVSTREAM_SIDE_DATA
if (si->inject_global_side_data)
sti->inject_global_side_data = 1;
#endif
sti->skip_samples = 0;
}
}
int avformat_flush(AVFormatContext *s)
{
ff_read_frame_flush(s);
return 0;
}
void ff_rescale_interval(AVRational tb_in, AVRational tb_out,
int64_t *min_ts, int64_t *ts, int64_t *max_ts)
{
*ts = av_rescale_q (* ts, tb_in, tb_out);
*min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
*max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
}
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