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avformat/dhav: make duration extraction more robust

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This commit is contained in:
Paul B Mahol 2021-10-13 12:12:35 +02:00
parent 6384175d8c
commit 13141339c1
1 changed files with 11 additions and 9 deletions
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20
libavformat/dhav.c
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@ -239,16 +239,18 @@ static int64_t get_duration(AVFormatContext *s)
return 0; return 0;
avio_seek(s->pb, avio_size(s->pb) - 8, SEEK_SET); avio_seek(s->pb, avio_size(s->pb) - 8, SEEK_SET);
if (avio_rl32(s->pb) == MKTAG('d','h','a','v')) { while (avio_tell(s->pb) > 12) {
int seek_back = avio_rl32(s->pb); if (avio_rl32(s->pb) == MKTAG('d','h','a','v')) {
int seek_back = avio_rl32(s->pb);
avio_seek(s->pb, -seek_back, SEEK_CUR); avio_seek(s->pb, -seek_back, SEEK_CUR);
read_chunk(s); read_chunk(s);
get_timeinfo(dhav->date, &timeinfo); get_timeinfo(dhav->date, &timeinfo);
end = av_timegm(&timeinfo) * 1000LL; end = av_timegm(&timeinfo) * 1000LL;
} else { break;
avio_seek(s->pb, start_pos, SEEK_SET); } else {
return 0; avio_seek(s->pb, -12, SEEK_CUR);
}
} }
avio_seek(s->pb, start_pos, SEEK_SET); avio_seek(s->pb, start_pos, SEEK_SET);