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more correct header parsing 

Originally committed as revision 2571 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Beregszaszi 2003-12-08 11:32:06 +00:00
parent ecfc44e66e
commit 3c3f113ec1
1 changed files with 57 additions and 25 deletions
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82
libavcodec/vp3.c
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@ -216,6 +216,7 @@ static int ModeAlphabet[7][CODING_MODE_COUNT] =
typedef struct Vp3DecodeContext {
AVCodecContext *avctx;
int theora, theora_tables;
int version;
int width, height;
AVFrame golden_frame;
AVFrame last_frame;
@ -302,6 +303,9 @@ typedef struct Vp3DecodeContext {
uint8_t qscale_table[2048]; //FIXME dynamic alloc (width+15)/16
} Vp3DecodeContext;
static int theora_decode_comments(AVCodecContext *avctx, GetBitContext gb);
static int theora_decode_tables(AVCodecContext *avctx, GetBitContext gb);
/************************************************************************
* VP3 I/DCT
************************************************************************/
@ -2611,6 +2615,11 @@ static int vp3_decode_init(AVCodecContext *avctx)
int y_superblock_count;
int c_superblock_count;
if (avctx->codec_tag == MKTAG('V','P','3','0'))
s->version = 0;
else
s->version = 1;
s->avctx = avctx;
#if 0
s->width = avctx->width;
@ -2756,30 +2765,32 @@ static int vp3_decode_frame(AVCodecContext *avctx,
if (s->theora && get_bits1(&gb))
{
av_log(s->avctx, AV_LOG_ERROR, "Theora: bad frame indicator\n");
return -1;
int ptype = get_bits(&gb, 7);
skip_bits(&gb, 6*8); /* "theora" */
switch(ptype)
{
case 1:
theora_decode_comments(avctx, gb);
break;
case 2:
theora_decode_tables(avctx, gb);
init_dequantizer(s);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown Theora config packet: %d\n", ptype);
}
return buf_size;
}
s->keyframe = !get_bits1(&gb);
if (s->theora)
{
s->last_quality_index = s->quality_index;
s->quality_index = get_bits(&gb, 6);
if (s->theora >= 0x030300)
skip_bits1(&gb);
if (s->keyframe)
{
if (get_bits1(&gb))
av_log(s->avctx, AV_LOG_ERROR, "Theora: warning, unsupported keyframe coding type?!\n");
skip_bits(&gb, 2); /* reserved? */
}
}
else
{
if (!s->theora)
skip_bits(&gb, 1);
s->last_quality_index = s->quality_index;
s->quality_index = get_bits(&gb, 6);
}
s->last_quality_index = s->quality_index;
s->quality_index = get_bits(&gb, 6);
if (s->theora >= 0x030300)
skip_bits1(&gb);
debug_vp3(" VP3 %sframe #%d: Q index = %d\n",
s->keyframe?"key":"", counter, s->quality_index);
@ -2789,8 +2800,24 @@ static int vp3_decode_frame(AVCodecContext *avctx,
init_dequantizer(s);
if (s->keyframe) {
/* skip the other 2 header bytes for now */
if (!s->theora) skip_bits(&gb, 16);
if (!s->theora)
{
skip_bits(&gb, 4); /* width code */
skip_bits(&gb, 4); /* height code */
if (s->version)
{
s->version = get_bits(&gb, 5);
if (counter == 1)
av_log(s->avctx, AV_LOG_DEBUG, "VP version: %d\n", s->version);
}
}
if (s->version || s->theora)
{
if (get_bits1(&gb))
av_log(s->avctx, AV_LOG_ERROR, "Warning, unsupported keyframe coding type?!\n");
skip_bits(&gb, 2); /* reserved? */
}
if (s->last_frame.data[0] == s->golden_frame.data[0]) {
if (s->golden_frame.data[0])
avctx->release_buffer(avctx, &s->golden_frame);
@ -2979,14 +3006,17 @@ static int theora_decode_comments(AVCodecContext *avctx, GetBitContext gb)
int nb_comments, i, tmp;
tmp = get_bits(&gb, 32);
while(tmp-=8)
skip_bits(&gb, 8);
tmp = be2me_32(tmp);
while(tmp--)
skip_bits(&gb, 8);
nb_comments = get_bits(&gb, 32);
nb_comments = be2me_32(nb_comments);
for (i = 0; i < nb_comments; i++)
{
tmp = get_bits(&gb, 32);
while(tmp-=8)
tmp = be2me_32(tmp);
while(tmp--)
skip_bits(&gb, 8);
}
@ -3017,6 +3047,8 @@ static int theora_decode_tables(AVCodecContext *avctx, GetBitContext gb)
/* inter coeffs */
for (i = 0; i < 64; i++)
s->coded_inter_dequant[i] = get_bits(&gb, 8);
/* FIXME: read huffmann tree.. */
s->theora_tables = 1;