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Correctly skip unknown matrices (patch by Matthieu Castet) and disable comment reading

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Originally committed as revision 4704 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Matthieu Castet 2005-11-13 20:06:31 +00:00 committed by Alex Beregszaszi
parent 7146d2c267
commit 2da2ba037a
1 changed files with 21 additions and 12 deletions
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33
libavcodec/vp3.c
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@ -63,7 +63,7 @@
#define KEYFRAMES_ONLY 0
#define DEBUG_VP3 0
#define DEBUG_VP3 1
#define DEBUG_INIT 0
#define DEBUG_DEQUANTIZERS 0
#define DEBUG_BLOCK_CODING 0
@ -2780,7 +2780,7 @@ static int theora_decode_comments(AVCodecContext *avctx, GetBitContext gb)
static int theora_decode_tables(AVCodecContext *avctx, GetBitContext gb)
{
Vp3DecodeContext *s = avctx->priv_data;
int i, n;
int i, n, matrices;
if (s->theora >= 0x030200) {
n = get_bits(&gb, 3);
@ -2806,12 +2806,12 @@ static int theora_decode_tables(AVCodecContext *avctx, GetBitContext gb)
s->coded_dc_scale_factor[i] = get_bits(&gb, n);
if (s->theora >= 0x030200)
n = get_bits(&gb, 9) + 1;
matrices = get_bits(&gb, 9) + 1;
else
n = 3;
if (n != 3) {
av_log(avctx,AV_LOG_ERROR, "unsupported nbms : %d\n", n);
return -1;
matrices = 3;
if (matrices != 3) {
av_log(avctx,AV_LOG_ERROR, "unsupported matrices: %d\n", matrices);
// return -1;
}
/* y coeffs */
for (i = 0; i < 64; i++)
@ -2825,7 +2825,12 @@ static int theora_decode_tables(AVCodecContext *avctx, GetBitContext gb)
for (i = 0; i < 64; i++)
s->coded_inter_dequant[i] = get_bits(&gb, 8);
/* Huffman tables */
/* skip unknown matrices */
n = matrices - 3;
while(n--)
for (i = 0; i < 64; i++)
skip_bits(&gb, 8);
for (i = 0; i <= 1; i++) {
for (n = 0; n <= 2; n++) {
int newqr;
@ -2839,17 +2844,20 @@ static int theora_decode_tables(AVCodecContext *avctx, GetBitContext gb)
}
else {
int qi = 0;
skip_bits(&gb, av_log2(2)+1);
skip_bits(&gb, av_log2(matrices-1)+1);
while (qi < 63) {
qi += get_bits(&gb, av_log2(63-qi)+1) + 1;
skip_bits(&gb, av_log2(2)+1);
skip_bits(&gb, av_log2(matrices-1)+1);
}
if (qi > 63)
if (qi > 63) {
av_log(avctx, AV_LOG_ERROR, "invalid qi %d > 63\n", qi);
return -1;
}
}
}
}
/* Huffman tables */
for (s->hti = 0; s->hti < 80; s->hti++) {
s->entries = 0;
s->huff_code_size = 1;
@ -2907,7 +2915,8 @@ static int theora_decode_init(AVCodecContext *avctx)
theora_decode_header(avctx, gb);
break;
case 0x81:
theora_decode_comments(avctx, gb);
// FIXME: is this needed? it breaks sometimes
// theora_decode_comments(avctx, gb);
break;
case 0x82:
theora_decode_tables(avctx, gb);