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fftools/ffmpeg: use a separate variable for discontinuity offset

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This will allow to move normal offset handling to demuxer thread, since
discontinuities currently have to be processed in the main thread, as
the code uses some decoder-produced values.
This commit is contained in:
Anton Khirnov
2022-08-10 17:37:12 +02:00
parent ca38fe927e
commit 3b2beceae1
2 changed files with 32 additions and 11 deletions
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35
fftools/ffmpeg.c
View File

@@ -3694,7 +3694,7 @@ static void decode_flush(InputFile *ifile)
} }
} }
static void ts_discontinuity_process(InputFile *ifile, InputStream *ist, static void ts_discontinuity_detect(InputFile *ifile, InputStream *ist,
AVPacket *pkt) AVPacket *pkt)
{ {
const int fmt_is_discont = ifile->ctx->iformat->flags & AVFMT_TS_DISCONT; const int fmt_is_discont = ifile->ctx->iformat->flags & AVFMT_TS_DISCONT;
@@ -3716,13 +3716,13 @@ static void ts_discontinuity_process(InputFile *ifile, InputStream *ist,
if (fmt_is_discont) { if (fmt_is_discont) {
if (FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE || if (FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE ||
pkt_dts + AV_TIME_BASE/10 < FFMAX(ist->pts, ist->dts)) { pkt_dts + AV_TIME_BASE/10 < FFMAX(ist->pts, ist->dts)) {
ifile->ts_offset -= delta; ifile->ts_offset_discont -= delta;
av_log(NULL, AV_LOG_DEBUG, av_log(NULL, AV_LOG_DEBUG,
"timestamp discontinuity for stream #%d:%d " "timestamp discontinuity for stream #%d:%d "
"(id=%d, type=%s): %"PRId64", new offset= %"PRId64"\n", "(id=%d, type=%s): %"PRId64", new offset= %"PRId64"\n",
ist->file_index, ist->st->index, ist->st->id, ist->file_index, ist->st->index, ist->st->id,
av_get_media_type_string(ist->st->codecpar->codec_type), av_get_media_type_string(ist->st->codecpar->codec_type),
delta, ifile->ts_offset); delta, ifile->ts_offset_discont);
pkt->dts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base); pkt->dts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
if (pkt->pts != AV_NOPTS_VALUE) if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base); pkt->pts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
@@ -3745,10 +3745,10 @@ static void ts_discontinuity_process(InputFile *ifile, InputStream *ist,
fmt_is_discont && ifile->last_ts != AV_NOPTS_VALUE) { fmt_is_discont && ifile->last_ts != AV_NOPTS_VALUE) {
int64_t delta = pkt_dts - ifile->last_ts; int64_t delta = pkt_dts - ifile->last_ts;
if (FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE) { if (FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE) {
ifile->ts_offset -= delta; ifile->ts_offset_discont -= delta;
av_log(NULL, AV_LOG_DEBUG, av_log(NULL, AV_LOG_DEBUG,
"Inter stream timestamp discontinuity %"PRId64", new offset= %"PRId64"\n", "Inter stream timestamp discontinuity %"PRId64", new offset= %"PRId64"\n",
delta, ifile->ts_offset); delta, ifile->ts_offset_discont);
pkt->dts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base); pkt->dts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
if (pkt->pts != AV_NOPTS_VALUE) if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base); pkt->pts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
@@ -3758,6 +3758,26 @@ static void ts_discontinuity_process(InputFile *ifile, InputStream *ist,
ifile->last_ts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q); ifile->last_ts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q);
} }
static void ts_discontinuity_process(InputFile *ifile, InputStream *ist,
AVPacket *pkt)
{
int64_t offset = av_rescale_q(ifile->ts_offset_discont, AV_TIME_BASE_Q,
ist->st->time_base);
// apply previously-detected timestamp-discontinuity offset
// (to all streams, not just audio/video)
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += offset;
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts += offset;
// detect timestamp discontinuities for audio/video
if ((ist->st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
ist->st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) &&
pkt->dts != AV_NOPTS_VALUE)
ts_discontinuity_detect(ifile, ist, pkt);
}
/* /*
* Return * Return
* - 0 -- one packet was read and processed * - 0 -- one packet was read and processed
@@ -3898,10 +3918,7 @@ static int process_input(int file_index)
if (pkt->dts != AV_NOPTS_VALUE) if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += duration; pkt->dts += duration;
// detect and correct timestamp discontinuities for audio/video // detect and try to correct for timestamp discontinuities
if ((ist->st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
ist->st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) &&
pkt->dts != AV_NOPTS_VALUE)
ts_discontinuity_process(ifile, ist, pkt); ts_discontinuity_process(ifile, ist, pkt);
if (debug_ts) { if (debug_ts) {

4
fftools/ffmpeg.h
View File

@@ -427,6 +427,10 @@ typedef struct InputFile {
int input_sync_ref; int input_sync_ref;
int64_t ts_offset; int64_t ts_offset;
/**
* Extra timestamp offset added by discontinuity handling.
*/
int64_t ts_offset_discont;
int64_t last_ts; int64_t last_ts;
int64_t start_time; /* user-specified start time in AV_TIME_BASE or AV_NOPTS_VALUE */ int64_t start_time; /* user-specified start time in AV_TIME_BASE or AV_NOPTS_VALUE */
int64_t recording_time; int64_t recording_time;