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fftools/sync_queue: make sure non-limiting streams are not used as queue head

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A non-limiting stream could mistakenly end up being the queue head,
which would then produce incorrect synchronization, seen e.g. in
fate-matroska-flac-extradata-update for certain number of frame threads
(e.g. 5).

Found-By: James Almer
This commit is contained in:
Anton Khirnov 2023-05-23 15:46:11 +02:00
parent e9a868e9ee
commit 163e3a299e
1 changed files with 11 additions and 2 deletions
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13
fftools/sync_queue.c
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@ -217,17 +217,26 @@ static void finish_stream(SyncQueue *sq, unsigned int stream_idx)
static void queue_head_update(SyncQueue *sq)
{
av_assert0(sq->have_limiting);
if (sq->head_stream < 0) {
unsigned first_limiting = UINT_MAX;
/* wait for one timestamp in each stream before determining
* the queue head */
for (unsigned int i = 0; i < sq->nb_streams; i++) {
SyncQueueStream *st = &sq->streams[i];
if (st->limiting && st->head_ts == AV_NOPTS_VALUE)
if (!st->limiting)
continue;
if (st->head_ts == AV_NOPTS_VALUE)
return;
if (first_limiting == UINT_MAX)
first_limiting = i;
}
// placeholder value, correct one will be found below
sq->head_stream = 0;
av_assert0(first_limiting < UINT_MAX);
sq->head_stream = first_limiting;
}
for (unsigned int i = 0; i < sq->nb_streams; i++) {