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avformat/dhav: handle files missing data at start

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Try to seek to end of file and if signature is found seek backwards until
last valid chunk is found.
This commit is contained in:
Paul B Mahol 2019-08-24 18:03:46 +02:00 committed by Kieran Kunhya
parent 96fd07351a
commit 45cefca1e7
1 changed files with 19 additions and 4 deletions
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23
libavformat/dhav.c
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@ -73,15 +73,30 @@ static int dhav_read_header(AVFormatContext *s)
ffio_ensure_seekback(s->pb, 5);
avio_read(s->pb, signature, sizeof(signature));
if (!memcmp(signature, "DAHUA", 5))
if (!memcmp(signature, "DAHUA", 5)) {
avio_skip(s->pb, 0x400 - 5);
else
avio_seek(s->pb, -5, SEEK_CUR);
dhav->last_good_pos = avio_tell(s->pb);
} else {
if (!memcmp(signature, "DHAV", 4)) {
avio_seek(s->pb, -5, SEEK_CUR);
dhav->last_good_pos = avio_tell(s->pb);
} else if (s->pb->seekable) {
avio_seek(s->pb, avio_size(s->pb) - 8, SEEK_SET);
while (avio_rl32(s->pb) == MKTAG('d','h','a','v')) {
int seek_back;
seek_back = avio_rl32(s->pb) + 8;
dhav->last_good_pos = avio_tell(s->pb);
if (dhav->last_good_pos < seek_back)
break;
avio_seek(s->pb, -seek_back, SEEK_CUR);
}
}
}
s->ctx_flags |= AVFMTCTX_NOHEADER;
dhav->video_stream_index = -1;
dhav->audio_stream_index = -1;
dhav->last_good_pos = avio_tell(s->pb);
return 0;
}