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lavf/mov: Support unusual alac files without frma and alac atoms.

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Fixes ticket #4747.
This commit is contained in:
Carl Eugen Hoyos 2015-08-27 03:29:29 +02:00
parent 7f9656f10d
commit 33908f0837
1 changed files with 26 additions and 0 deletions
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26
libavformat/mov.c
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@ -1436,6 +1436,32 @@ static int mov_read_wave(MOVContext *c, AVIOContext *pb, MOVAtom atom)
if (ret < 0)
return ret;
} else if (atom.size > 8) { /* to read frma, esds atoms */
if (st->codec->codec_id == AV_CODEC_ID_ALAC && atom.size >= 24) {
uint64_t buffer;
ret = ffio_ensure_seekback(pb, 8);
if (ret < 0)
return ret;
buffer = avio_rb64(pb);
atom.size -= 8;
if ( (buffer & 0xFFFFFFFF) == MKBETAG('f','r','m','a')
&& buffer >> 32 <= atom.size
&& buffer >> 32 >= 8) {
avio_skip(pb, -8);
atom.size += 8;
} else if (!st->codec->extradata_size) {
#define ALAC_EXTRADATA_SIZE 36
st->codec->extradata = av_mallocz(ALAC_EXTRADATA_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata_size = ALAC_EXTRADATA_SIZE;
AV_WB32(st->codec->extradata , ALAC_EXTRADATA_SIZE);
AV_WB32(st->codec->extradata + 4, MKTAG('a','l','a','c'));
AV_WB64(st->codec->extradata + 12, buffer);
avio_read(pb, st->codec->extradata + 20, 16);
avio_skip(pb, atom.size - 24);
return 0;
}
}
if ((ret = mov_read_default(c, pb, atom)) < 0)
return ret;
} else