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ffmpeg.wasm-core
Commit a8dd8dc6 authored by Ivan Schreter's avatar Ivan Schreter
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Use generic multi-stream key frame finding routine to implement read_seek2 and map 

read_seek to read_seek2.

Originally committed as revision 19681 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 101036ad
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Showing with 94 additions and 45 deletions
libavformat/mpegts.c
View file @ a8dd8dc6
......@@ -28,6 +28,7 @@
#include "avformat.h"
#include "mpegts.h"
#include "internal.h"
#include "seek.h"
/* 1.0 second at 24Mbit/s */
#define MAX_SCAN_PACKETS 32000
......@@ -1521,29 +1522,81 @@ static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
return timestamp;
}
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
MpegTSContext *ts = s->priv_data;
uint8_t buf[TS_PACKET_SIZE];
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
static int read_seek2(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t target_ts, int64_t max_ts, int flags)
{
int64_t pos;
if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
return -1;
int64_t ts_ret, ts_adj;
int stream_index_gen_search;
AVStream *st;
AVParserState *backup;
pos= url_ftell(s->pb);
backup = ff_store_parser_state(s);
for(;;) {
url_fseek(s->pb, pos, SEEK_SET);
if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
// detect direction of seeking for search purposes
flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ? AVSEEK_FLAG_BACKWARD : 0;
if (flags & AVSEEK_FLAG_BYTE) {
/* use position directly, we will search starting from it */
pos = target_ts;
} else {
/* search for some position with good timestamp match */
if(stream_index < 0){
stream_index_gen_search = av_find_default_stream_index(s);
if (stream_index_gen_search < 0) {
ff_restore_parser_state(s, backup);
return -1;
}
st = s->streams[stream_index_gen_search];
/* timestamp for default must be expressed in AV_TIME_BASE units */
ts_adj = av_rescale(target_ts, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
} else {
ts_adj = target_ts;
stream_index_gen_search = stream_index;
}
pos = av_gen_search(s, stream_index_gen_search, ts_adj,
0, INT64_MAX, -1,
AV_NOPTS_VALUE,
AV_NOPTS_VALUE,
flags, &ts_ret, mpegts_get_pcr);
if (pos < 0) {
ff_restore_parser_state(s, backup);
return -1;
// pid = AV_RB16(buf + 1) & 0x1fff;
if(buf[1] & 0x40) break;
pos += ts->raw_packet_size;
}
}
url_fseek(s->pb, pos, SEEK_SET);
/* search for actual matching keyframe/starting position for all streams */
if (ff_gen_syncpoint_search(s, stream_index, pos, min_ts, target_ts, max_ts, flags) < 0) {
ff_restore_parser_state(s, backup);
return -1;
}
ff_free_parser_state(s, backup);
return 0;
}
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
{
int ret;
if (flags & AVSEEK_FLAG_BACKWARD) {
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags & ~AVSEEK_FLAG_BACKWARD);
if (ret < 0) {
// for compatibility reasons, seek to best-fitting timestamp
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags & ~AVSEEK_FLAG_BACKWARD);
}
} else {
ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
if (ret < 0) {
// for compatibility reasons, seek to best-fitting timestamp
ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
}
}
return ret;
}
/**************************************************************/
/* parsing functions - called from other demuxers such as RTP */
......@@ -1608,6 +1661,7 @@ AVInputFormat mpegts_demuxer = {
read_seek,
mpegts_get_pcr,
.flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
.read_seek2 = read_seek2,
};
AVInputFormat mpegtsraw_demuxer = {
......@@ -1621,4 +1675,5 @@ AVInputFormat mpegtsraw_demuxer = {
read_seek,
mpegts_get_pcr,
.flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
.read_seek2 = read_seek2,
};
tests/seek.regression.ref
View file @ a8dd8dc6
......@@ -3599,57 +3599,51 @@ ret:-1 st:-1 ts:-0.645825 flags:1
tests/data/b-lavf.ts
ret: 0 st: 0 dts:0.660000 pts:0.700000 pos:564 size:24801 flags:1
ret: 0 st:-1 ts:-1.000000 flags:0
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:0.660000 pts:0.700000 pos:564 size:24801 flags:1
ret: 0 st:-1 ts:1.894167 flags:1
ret: 0 st: 0 dts:0.780000 pts:0.820000 pos:65612 size:12623 flags:0
ret: 0 st: 1 dts:1.457556 pts:1.457556 pos:435596 size:409 flags:1
ret: 0 st: 0 ts:0.788333 flags:0
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 ts:-0.317500 flags:1
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:1.100000 pts:1.140000 pos:189504 size:12236 flags:0
ret:-1 st: 0 ts:-0.317500 flags:1
ret: 0 st: 1 ts:2.576667 flags:0
ret: 0 st: 0 dts:0.860000 pts:0.900000 pos:96068 size:13086 flags:0
ret:-5
ret: 0 st: 1 ts:1.470833 flags:1
ret: 0 st: 0 dts:0.780000 pts:0.820000 pos:65612 size:12623 flags:0
ret: 0 st: 0 dts:1.140000 pts:1.180000 pos:203980 size:24787 flags:1
ret: 0 st:-1 ts:0.365002 flags:0
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st:-1 ts:-0.740831 flags:1
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:0.660000 pts:0.700000 pos:564 size:24801 flags:1
ret:-1 st:-1 ts:-0.740831 flags:1
ret: 0 st: 0 ts:2.153333 flags:0
ret: 0 st: 0 dts:0.820000 pts:0.860000 pos:80464 size:13388 flags:0
ret:-5
ret: 0 st: 0 ts:1.047500 flags:1
ret: 0 st: 0 dts:0.740000 pts:0.780000 pos:48316 size:14502 flags:0
ret: 0 st: 0 dts:0.660000 pts:0.700000 pos:564 size:24801 flags:1
ret: 0 st: 1 ts:-0.058333 flags:0
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:0.660000 pts:0.700000 pos:564 size:24801 flags:1
ret: 0 st: 1 ts:2.835833 flags:1
ret: 0 st: 0 dts:0.900000 pts:0.940000 pos:111296 size:12781 flags:0
ret: 0 st: 1 dts:1.457556 pts:1.457556 pos:435596 size:409 flags:1
ret: 0 st:-1 ts:1.730004 flags:0
ret: 0 st: 0 dts:0.780000 pts:0.820000 pos:65612 size:12623 flags:0
ret: 0 st:-1 ts:0.624171 flags:1
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret:-5
ret:-1 st:-1 ts:0.624171 flags:1
ret: 0 st: 0 ts:-0.481667 flags:0
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:0.660000 pts:0.700000 pos:564 size:24801 flags:1
ret: 0 st: 0 ts:2.412500 flags:1
ret: 0 st: 0 dts:0.860000 pts:0.900000 pos:96068 size:13086 flags:0
ret: 0 st: 1 dts:1.457556 pts:1.457556 pos:435596 size:409 flags:1
ret: 0 st: 1 ts:1.306667 flags:0
ret: 0 st: 0 dts:0.740000 pts:0.780000 pos:48316 size:14502 flags:0
ret: 0 st: 1 ts:0.200844 flags:1
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:1.460000 pts:1.500000 pos:351184 size:12679 flags:0
ret:-1 st: 1 ts:0.200844 flags:1
ret: 0 st:-1 ts:-0.904994 flags:0
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:0.660000 pts:0.700000 pos:564 size:24801 flags:1
ret: 0 st:-1 ts:1.989173 flags:1
ret: 0 st: 0 dts:0.820000 pts:0.860000 pos:80464 size:13388 flags:0
ret: 0 st: 1 dts:1.457556 pts:1.457556 pos:435596 size:409 flags:1
ret: 0 st: 0 ts:0.883344 flags:0
ret: 0 st: 0 dts:0.740000 pts:0.780000 pos:48316 size:14502 flags:0
ret: 0 st: 0 ts:-0.222489 flags:1
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:1.100000 pts:1.140000 pos:189504 size:12236 flags:0
ret:-1 st: 0 ts:-0.222489 flags:1
ret: 0 st: 1 ts:2.671678 flags:0
ret: 0 st: 0 dts:0.860000 pts:0.900000 pos:96068 size:13086 flags:0
ret:-5
ret: 0 st: 1 ts:1.565844 flags:1
ret: 0 st: 0 dts:0.780000 pts:0.820000 pos:65612 size:12623 flags:0
ret: 0 st: 0 dts:1.140000 pts:1.180000 pos:203980 size:24787 flags:1
ret: 0 st:-1 ts:0.460008 flags:0
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st:-1 ts:-0.645825 flags:1
ret: 0 st: 0 dts:0.700000 pts:0.740000 pos:29140 size:16433 flags:0
ret: 0 st: 0 dts:0.660000 pts:0.700000 pos:564 size:24801 flags:1
ret:-1 st:-1 ts:-0.645825 flags:1
----------------
tests/data/b-lavf.ul
ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
......
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