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avformat/mov: fix incorrect sample rate by parse srat box

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This commit is contained in:
Zhao Zhili
2025-11-21 20:43:56 +08:00
committed by James Almer
parent c0044ec9c4
commit d3e80837e7
1 changed files with 35 additions and 0 deletions
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35
libavformat/mov.c
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@@ -1075,6 +1075,40 @@ fail:
}
#endif
static int mov_read_srat(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
int32_t sample_rate;
if (atom.size < 8 || c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
av_log(c->fc, AV_LOG_WARNING, "'srat' within non-audio sample entry, skip\n");
return 0;
}
if (!c->isom) {
av_log(c->fc, AV_LOG_WARNING, "'srat' within non-isom, skip\n");
return 0;
}
avio_skip(pb, 4); // version+flags
sample_rate = avio_rb32(pb);
if (sample_rate > 0) {
av_log(c->fc, AV_LOG_DEBUG,
"overwrite sample rate from %d to %d by 'srat'\n",
st->codecpar->sample_rate, sample_rate);
st->codecpar->sample_rate = sample_rate;
} else {
av_log(c->fc, AV_LOG_WARNING,
"ignore invalid sample rate %d in 'srat'\n", sample_rate);
}
return 0;
}
static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
@@ -9489,6 +9523,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
#if CONFIG_IAMFDEC
{ MKTAG('i','a','c','b'), mov_read_iacb },
#endif
{ MKTAG('s','r','a','t'), mov_read_srat },
{ 0, NULL }
};