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alacdec: read/validate number of channels from the extradata. 

check frame header channel count against header/container channel count.
This commit is contained in:
Justin Ruggles 2011-10-05 20:07:29 -04:00
parent 47e9c75b36
commit dcaa83a0fc
1 changed files with 19 additions and 6 deletions
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25
libavcodec/alac.c
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@ -119,7 +119,7 @@ static int alac_set_info(ALACContext *alac)
alac->setinfo_rice_historymult = *ptr++;
alac->setinfo_rice_initialhistory = *ptr++;
alac->setinfo_rice_kmodifier = *ptr++;
ptr++; /* channels? */
alac->numchannels = *ptr++;
bytestream_get_be16(&ptr); /* ??? */
bytestream_get_be32(&ptr); /* max coded frame size */
bytestream_get_be32(&ptr); /* bitrate ? */
@ -456,10 +456,9 @@ static int alac_decode_frame(AVCodecContext *avctx,
init_get_bits(&alac->gb, inbuffer, input_buffer_size * 8);
channels = get_bits(&alac->gb, 3) + 1;
if (channels > MAX_CHANNELS) {
av_log(avctx, AV_LOG_ERROR, "channels > %d not supported\n",
MAX_CHANNELS);
return -1;
if (channels != avctx->channels) {
av_log(avctx, AV_LOG_ERROR, "frame header channel count mismatch\n");
return AVERROR_INVALIDDATA;
}
/* 2^result = something to do with output waiting.
@ -634,7 +633,6 @@ static av_cold int alac_decode_init(AVCodecContext * avctx)
{
ALACContext *alac = avctx->priv_data;
alac->avctx = avctx;
alac->numchannels = alac->avctx->channels;
/* initialize from the extradata */
if (alac->avctx->extradata_size != ALAC_EXTRADATA_SIZE) {
@ -657,6 +655,21 @@ static av_cold int alac_decode_init(AVCodecContext * avctx)
return -1;
}
if (alac->numchannels < 1) {
av_log(avctx, AV_LOG_WARNING, "Invalid channel count\n");
alac->numchannels = avctx->channels;
} else {
if (alac->numchannels > MAX_CHANNELS)
alac->numchannels = avctx->channels;
else
avctx->channels = alac->numchannels;
}
if (avctx->channels > MAX_CHANNELS) {
av_log(avctx, AV_LOG_ERROR, "Unsupported channel count: %d\n",
avctx->channels);
return AVERROR_PATCHWELCOME;
}
return 0;
}