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flvdec: Document how the duration is retrieved at the end of the file

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Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Uwe L. Korn 2014-11-23 19:36:14 +01:00 committed by Martin Storsjö
parent fe42f94ce1
commit 40665d27e3
1 changed files with 4 additions and 0 deletions
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4
libavformat/flvdec.c
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@ -845,9 +845,13 @@ skip:
if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE)) {
int size;
const int64_t pos = avio_tell(s->pb);
// Read the last 4 bytes of the file, this should be the size of the
// previous FLV tag. Use the timestamp of its payload as duration.
const int64_t fsize = avio_size(s->pb);
avio_seek(s->pb, fsize - 4, SEEK_SET);
size = avio_rb32(s->pb);
// Seek to the start of the last FLV tag at position (fsize - 4 - size)
// but skip the byte indicating the type.
avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
if (size == avio_rb24(s->pb) + 11) {
uint32_t ts = avio_rb24(s->pb);