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avformat/matroskaenc: Sort cues entries by pts 

Currently they are ordered as-written (i.e. by increasing position);
in case av_interleaved_write_frame() is used, this is (mostly)
the same as ordered by increasing dts.
Yet the Matroska specification strongly recommends (SHOULD) that
the CuePoints be sorted by CueTime. mkvalidator warns when they are
not. Therefore this commit sorts them accordingly.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-11-27 14:15:45 +01:00
parent d47a986b79
commit 8a18db3ec6
1 changed files with 14 additions and 5 deletions
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19
libavformat/matroskaenc.c
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@ -533,6 +533,7 @@ static int mkv_add_cuepoint(MatroskaMuxContext *mkv, int stream, int64_t ts,
{
mkv_cues *cues = &mkv->cues;
mkv_cuepoint *entries = cues->entries;
unsigned idx = cues->num_entries;
if (ts < 0)
return 0;
@ -542,11 +543,19 @@ static int mkv_add_cuepoint(MatroskaMuxContext *mkv, int stream, int64_t ts,
return AVERROR(ENOMEM);
cues->entries = entries;
cues->entries[cues->num_entries].pts = ts;
cues->entries[cues->num_entries].stream_idx = stream;
cues->entries[cues->num_entries].cluster_pos = cluster_pos - mkv->segment_offset;
cues->entries[cues->num_entries].relative_pos = relative_pos;
cues->entries[cues->num_entries++].duration = duration;
/* Make sure the cues entries are sorted by pts. */
while (idx > 0 && entries[idx - 1].pts > ts)
idx--;
memmove(&entries[idx + 1], &entries[idx],
(cues->num_entries - idx) * sizeof(entries[0]));
entries[idx].pts = ts;
entries[idx].stream_idx = stream;
entries[idx].cluster_pos = cluster_pos - mkv->segment_offset;
entries[idx].relative_pos = relative_pos;
entries[idx].duration = duration;
cues->num_entries++;
return 0;
}