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alac: check for truncated packets 

This will give a clearer error message when the error is caused by a
truncated packet.
This commit is contained in:
Justin Ruggles 2012-07-19 20:04:40 -04:00
parent fb57e913e1
commit 81f548de57
1 changed files with 11 additions and 4 deletions
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15
libavcodec/alac.c
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@ -432,16 +432,19 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data,
ALACContext *alac = avctx->priv_data;
enum RawDataBlockType element;
int channels;
int ch, ret;
int ch, ret, got_end;
init_get_bits(&alac->gb, avpkt->data, avpkt->size * 8);
got_end = 0;
alac->nb_samples = 0;
ch = 0;
while (get_bits_left(&alac->gb)) {
while (get_bits_left(&alac->gb) >= 3) {
element = get_bits(&alac->gb, 3);
if (element == TYPE_END)
if (element == TYPE_END) {
got_end = 1;
break;
}
if (element > TYPE_CPE && element != TYPE_LFE) {
av_log(avctx, AV_LOG_ERROR, "syntax element unsupported: %d", element);
return AVERROR_PATCHWELCOME;
@ -456,11 +459,15 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data,
ret = decode_element(avctx, data,
alac_channel_layout_offsets[alac->channels - 1][ch],
channels);
if (ret < 0)
if (ret < 0 && get_bits_left(&alac->gb))
return ret;
ch += channels;
}
if (!got_end) {
av_log(avctx, AV_LOG_ERROR, "no end tag found. incomplete packet.\n");
return AVERROR_INVALIDDATA;
}
if (avpkt->size * 8 - get_bits_count(&alac->gb) > 8) {
av_log(avctx, AV_LOG_ERROR, "Error : %d bits left\n",