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hls: Respect the different stream time bases when comparing dts

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Also adjust the streams timestamps according to their start
timestamp when comparing. This helps getting correctly interleaved
packets if one stream lacks timestamps (such as a plain ADTS
stream when the other variants are full mpegts) when the others
have timestamps that don't start from zero.

This probably doesn't work properly if such a stream is
temporarily disabled (via the discard flags) and then reenabled,
and such streams are hard to correctly sync against the other
streams as well - but this works better than before at least.

The segment number restriction makes sure all variants advance
roughly at the same pace as well.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Michael Niedermayer 2012-08-21 01:00:05 +02:00 • committed by Martin Storsjö
parent c11e33a3d9
commit 9d64f23629
1 changed files with 21 additions and 4 deletions
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25
libavformat/hls.c
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@ -644,11 +644,28 @@ start:
/* Check if this stream still is on an earlier segment number, or
* has the packet with the lowest dts */
if (var->pkt.data) {
if (minvariant < 0 ||
var->cur_seq_no < c->variants[minvariant]->cur_seq_no ||
(var->cur_seq_no == c->variants[minvariant]->cur_seq_no &&
var->pkt.dts < c->variants[minvariant]->pkt.dts))
struct variant *minvar = c->variants[minvariant];
if (minvariant < 0 || var->cur_seq_no < minvar->cur_seq_no) {
minvariant = i;
} else if (var->cur_seq_no == minvar->cur_seq_no) {
int64_t dts = var->pkt.dts;
int64_t mindts = minvar->pkt.dts;
AVStream *st = var->ctx->streams[var->pkt.stream_index];
AVStream *minst = minvar->ctx->streams[minvar->pkt.stream_index];
if (dts == AV_NOPTS_VALUE) {
minvariant = i;
} else if (mindts != AV_NOPTS_VALUE) {
if (st->start_time != AV_NOPTS_VALUE)
dts -= st->start_time;
if (minst->start_time != AV_NOPTS_VALUE)
mindts -= minst->start_time;
if (av_compare_ts(dts, st->time_base,
mindts, minst->time_base) < 0)
minvariant = i;
}
}
}
}
if (c->end_of_segment) {