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alac: convert extradata reading to bytestream2.

This commit is contained in:
Ronald S. Bultje 2012-03-24 19:10:40 -07:00
parent 62ce9defb8
commit c3bbd0b53b
1 changed files with 20 additions and 19 deletions
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39
libavcodec/alac.c
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@ -571,29 +571,30 @@ buf_alloc_fail:
static int alac_set_info(ALACContext *alac)
{
const unsigned char *ptr = alac->avctx->extradata;
GetByteContext gb;
ptr += 4; /* size */
ptr += 4; /* alac */
ptr += 4; /* version */
bytestream2_init(&gb, alac->avctx->extradata,
alac->avctx->extradata_size);
if(AV_RB32(ptr) >= UINT_MAX/4){
av_log(alac->avctx, AV_LOG_ERROR, "setinfo_max_samples_per_frame too large\n");
return -1;
}
bytestream2_skipu(&gb, 12); // size:4, alac:4, version:4
/* buffer size / 2 ? */
alac->setinfo_max_samples_per_frame = bytestream_get_be32(&ptr);
ptr++; /* compatible version */
alac->setinfo_sample_size = *ptr++;
alac->setinfo_rice_historymult = *ptr++;
alac->setinfo_rice_initialhistory = *ptr++;
alac->setinfo_rice_kmodifier = *ptr++;
alac->numchannels = *ptr++;
bytestream_get_be16(&ptr); /* maxRun */
bytestream_get_be32(&ptr); /* max coded frame size */
bytestream_get_be32(&ptr); /* average bitrate */
bytestream_get_be32(&ptr); /* samplerate */
alac->setinfo_max_samples_per_frame = bytestream2_get_be32u(&gb);
if (alac->setinfo_max_samples_per_frame >= UINT_MAX/4){
av_log(alac->avctx, AV_LOG_ERROR,
"setinfo_max_samples_per_frame too large\n");
return AVERROR_INVALIDDATA;
}
bytestream2_skipu(&gb, 1); // compatible version
alac->setinfo_sample_size = bytestream2_get_byteu(&gb);
alac->setinfo_rice_historymult = bytestream2_get_byteu(&gb);
alac->setinfo_rice_initialhistory = bytestream2_get_byteu(&gb);
alac->setinfo_rice_kmodifier = bytestream2_get_byteu(&gb);
alac->numchannels = bytestream2_get_byteu(&gb);
bytestream2_get_be16u(&gb); // maxRun
bytestream2_get_be32u(&gb); // max coded frame size
bytestream2_get_be32u(&gb); // average bitrate
bytestream2_get_be32u(&gb); // samplerate
return 0;
}