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fix theora header parsing

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patch by Matthieu Castet <castet dot matthieu at free dot fr>

Originally committed as revision 4238 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Matthieu Castet 2005-05-13 21:06:44 +00:00 committed by Måns Rullgård
parent 30344a83e0
commit ba7ee4a460
1 changed files with 32 additions and 11 deletions
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43
libavcodec/vp3.c
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@ -2641,7 +2641,7 @@ static int vp3_decode_frame(AVCodecContext *avctx,
skip_bits(&gb, 1);
s->last_quality_index = s->quality_index;
s->quality_index = get_bits(&gb, 6);
if (s->theora >= 0x030300)
if (s->theora >= 0x030200)
skip_bits1(&gb);
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
@ -2810,9 +2810,9 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext gb)
/* FIXME: endianess? */
s->theora = (major << 16) | (minor << 8) | micro;
/* 3.3.0 aka alpha3 has the same frame orientation as original vp3 */
/* 3.2.0 aka alpha3 has the same frame orientation as original vp3 */
/* but previous versions have the image flipped relative to vp3 */
if (s->theora < 0x030300)
if (s->theora < 0x030200)
{
s->flipped_image = 1;
av_log(avctx, AV_LOG_DEBUG, "Old (<alpha3) Theora bitstream, flipped image\n");
@ -2837,14 +2837,14 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext gb)
skip_bits(&gb, 24); /* aspect numerator */
skip_bits(&gb, 24); /* aspect denumerator */
if (s->theora < 0x030300)
if (s->theora < 0x030200)
skip_bits(&gb, 5); /* keyframe frequency force */
skip_bits(&gb, 8); /* colorspace */
skip_bits(&gb, 24); /* bitrate */
skip_bits(&gb, 6); /* last(?) quality index */
if (s->theora >= 0x030300)
if (s->theora >= 0x030200)
{
skip_bits(&gb, 5); /* keyframe frequency force */
skip_bits(&gb, 5); /* spare bits */
@ -2855,8 +2855,6 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext gb)
avctx->width = s->width;
avctx->height = s->height;
vp3_decode_init(avctx);
return 0;
}
@ -2885,16 +2883,39 @@ 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;
int i, n;
if (s->theora >= 0x030200) {
n = get_bits(&gb, 3);
/* loop filter table */
for (i = 0; i < 64; i++)
skip_bits(&gb, n);
}
if (s->theora >= 0x030200)
n = get_bits(&gb, 4) + 1;
else
n = 16;
/* quality threshold table */
for (i = 0; i < 64; i++)
s->coded_ac_scale_factor[i] = get_bits(&gb, 16);
s->coded_ac_scale_factor[i] = get_bits(&gb, n);
if (s->theora >= 0x030200)
n = get_bits(&gb, 4) + 1;
else
n = 16;
/* dc scale factor table */
for (i = 0; i < 64; i++)
s->coded_dc_scale_factor[i] = get_bits(&gb, 16);
s->coded_dc_scale_factor[i] = get_bits(&gb, n);
if (s->theora >= 0x030200)
n = get_bits(&gb, 9) + 1;
else
n = 3;
if (n != 3) {
av_log(NULL,AV_LOG_ERROR, "unsupported nbms : %d\n", n);
return -1;
}
/* y coeffs */
for (i = 0; i < 64; i++)
s->coded_intra_y_dequant[i] = get_bits(&gb, 8);
@ -2946,7 +2967,6 @@ static int theora_decode_init(AVCodecContext *avctx)
{
case 0x80:
theora_decode_header(avctx, gb);
vp3_decode_init(avctx);
break;
case 0x81:
theora_decode_comments(avctx, gb);
@ -2957,6 +2977,7 @@ static int theora_decode_init(AVCodecContext *avctx)
}
}
vp3_decode_init(avctx);
return 0;
}