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avformat: do not fill-in audio packet duration in compute_pkt_fields()

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Use the estimated duration only to calculate missing timestamps if needed.
This commit is contained in:
Justin Ruggles 2012-02-27 18:07:07 -05:00
parent 6c65cf58fd
commit a7fa75684d
1 changed files with 33 additions and 14 deletions
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47
libavformat/utils.c
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@ -813,7 +813,8 @@ static void update_initial_timestamps(AVFormatContext *s, int stream_index,
st->start_time = pts;
}
static void update_initial_durations(AVFormatContext *s, AVStream *st, AVPacket *pkt)
static void update_initial_durations(AVFormatContext *s, AVStream *st,
int stream_index, int duration)
{
AVPacketList *pktl= s->packet_buffer;
int64_t cur_dts= 0;
@ -821,10 +822,10 @@ static void update_initial_durations(AVFormatContext *s, AVStream *st, AVPacket
if(st->first_dts != AV_NOPTS_VALUE){
cur_dts= st->first_dts;
for(; pktl; pktl= pktl->next){
if(pktl->pkt.stream_index == pkt->stream_index){
if(pktl->pkt.stream_index == stream_index){
if(pktl->pkt.pts != pktl->pkt.dts || pktl->pkt.dts != AV_NOPTS_VALUE || pktl->pkt.duration)
break;
cur_dts -= pkt->duration;
cur_dts -= duration;
}
}
pktl= s->packet_buffer;
@ -833,15 +834,16 @@ static void update_initial_durations(AVFormatContext *s, AVStream *st, AVPacket
return;
for(; pktl; pktl= pktl->next){
if(pktl->pkt.stream_index != pkt->stream_index)
if(pktl->pkt.stream_index != stream_index)
continue;
if(pktl->pkt.pts == pktl->pkt.dts && pktl->pkt.dts == AV_NOPTS_VALUE
&& !pktl->pkt.duration){
pktl->pkt.dts= cur_dts;
if(!st->codec->has_b_frames)
pktl->pkt.pts= cur_dts;
cur_dts += pkt->duration;
pktl->pkt.duration= pkt->duration;
cur_dts += duration;
if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO)
pktl->pkt.duration = duration;
}else
break;
}
@ -884,13 +886,13 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
pkt->dts= pkt->pts= AV_NOPTS_VALUE;
}
if (pkt->duration == 0) {
if (pkt->duration == 0 && st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
compute_frame_duration(&num, &den, st, pc, pkt);
if (den && num) {
pkt->duration = av_rescale_rnd(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num, AV_ROUND_DOWN);
if(pkt->duration != 0 && s->packet_buffer)
update_initial_durations(s, st, pkt);
update_initial_durations(s, st, pkt->stream_index, pkt->duration);
}
}
@ -951,12 +953,29 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
st->last_IP_pts= pkt->pts;
/* cannot compute PTS if not present (we can compute it only
by knowing the future */
} else if(pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE || pkt->duration){
if(pkt->pts != AV_NOPTS_VALUE && pkt->duration){
int64_t old_diff= FFABS(st->cur_dts - pkt->duration - pkt->pts);
} else if (pkt->pts != AV_NOPTS_VALUE ||
pkt->dts != AV_NOPTS_VALUE ||
pkt->duration ||
st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
int duration = pkt->duration;
if (!duration && st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
compute_frame_duration(&num, &den, st, pc, pkt);
if (den && num) {
duration = av_rescale_rnd(1, num * (int64_t)st->time_base.den,
den * (int64_t)st->time_base.num,
AV_ROUND_DOWN);
if (duration != 0 && s->packet_buffer) {
update_initial_durations(s, st, pkt->stream_index,
duration);
}
}
}
if(pkt->pts != AV_NOPTS_VALUE && duration){
int64_t old_diff= FFABS(st->cur_dts - duration - pkt->pts);
int64_t new_diff= FFABS(st->cur_dts - pkt->pts);
if(old_diff < new_diff && old_diff < (pkt->duration>>3)){
pkt->pts += pkt->duration;
if(old_diff < new_diff && old_diff < (duration>>3)){
pkt->pts += duration;
// av_log(NULL, AV_LOG_DEBUG, "id:%d old:%"PRId64" new:%"PRId64" dur:%d cur:%"PRId64" size:%d\n", pkt->stream_index, old_diff, new_diff, pkt->duration, st->cur_dts, pkt->size);
}
}
@ -969,7 +988,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
pkt->pts = st->cur_dts;
pkt->dts = pkt->pts;
if(pkt->pts != AV_NOPTS_VALUE)
st->cur_dts = pkt->pts + pkt->duration;
st->cur_dts = pkt->pts + duration;
}
}