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caf: support either old or new style ALAC magic kuki chunk

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This commit is contained in:
Justin Ruggles 2012-07-08 19:33:10 -04:00
parent 45870f8b6e
commit b0b77b9ca5
1 changed files with 26 additions and 4 deletions
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30
libavformat/cafdec.c
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@ -121,18 +121,40 @@ static int read_kuki_chunk(AVFormatContext *s, int64_t size)
} else if (st->codec->codec_id == CODEC_ID_ALAC) {
#define ALAC_PREAMBLE 12
#define ALAC_HEADER 36
if (size < ALAC_PREAMBLE + ALAC_HEADER) {
#define ALAC_NEW_KUKI 24
uint8_t preamble[12];
if (size < ALAC_NEW_KUKI || size > ALAC_PREAMBLE + ALAC_HEADER) {
av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
avio_skip(pb, size);
return AVERROR_INVALIDDATA;
}
avio_skip(pb, ALAC_PREAMBLE);
avio_read(pb, preamble, ALAC_PREAMBLE);
st->codec->extradata = av_mallocz(ALAC_HEADER + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
avio_read(pb, st->codec->extradata, ALAC_HEADER);
/* For the old style cookie, we skip 12 bytes, then read 36 bytes.
* The new style cookie only contains the last 24 bytes of what was
* 36 bytes in the old style cookie, so we fabricate the first 12 bytes
* in that case to maintain compatibility. */
if (!memcmp(&preamble[4], "frmaalac", 8)) {
if (size < ALAC_PREAMBLE + ALAC_HEADER) {
av_log(s, AV_LOG_ERROR, "invalid ALAC magic cookie\n");
av_freep(&st->codec->extradata);
return AVERROR_INVALIDDATA;
}
avio_read(pb, st->codec->extradata, ALAC_HEADER);
avio_skip(pb, size - ALAC_PREAMBLE - ALAC_HEADER);
} else {
AV_WB32(st->codec->extradata, 36);
memcpy(&st->codec->extradata[4], "alac", 4);
AV_WB32(&st->codec->extradata[8], 0);
memcpy(&st->codec->extradata[12], preamble, 12);
avio_read(pb, &st->codec->extradata[24], ALAC_NEW_KUKI - 12);
avio_skip(pb, size - ALAC_NEW_KUKI);
}
st->codec->extradata_size = ALAC_HEADER;
avio_skip(pb, size - ALAC_PREAMBLE - ALAC_HEADER);
} else {
st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)