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fixing many bugs in bitplane_decoding() 

spliting row/colskip cases into their own functions as these will be needed for NORM/DIFF-6

Originally committed as revision 3879 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-01-24 00:35:18 +00:00
parent e902560005
commit d29f0cd9c1
1 changed files with 56 additions and 42 deletions
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98
libavcodec/vc9.c
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@ -699,11 +699,40 @@ static int advanced_entry_point_process(AVCodecContext *avctx, GetBitContext *gb
#define IMODE_ROWSKIP 5
#define IMODE_COLSKIP 6
static void decode_rowskip(uint8_t* plane, int width, int height, int stride, VC9Context *v){
int x, y;
for (y=0; y<height; y++){
if (!get_bits(&v->gb, 1)) //rowskip
memset(plane, 0, width);
else
for (x=0; x<width; x++)
plane[x] = get_bits(&v->gb, 1);
plane += stride;
}
}
static void decode_colskip(uint8_t* plane, int width, int height, int stride, VC9Context *v){
int x, y;
for (x=0; x<width; x++){
if (!get_bits(&v->gb, 1)) //colskip
for (y=0; y<height; y++)
plane[y*stride] = 0;
else
for (y=0; y<height; y++)
plane[y*stride] = get_bits(&v->gb, 1);
plane ++;
}
}
//FIXME optimize
//FIXME is this supposed to set elements to 0/FF or 0/1?
static int bitplane_decoding(uint8_t* plane, int width, int height, VC9Context *v)
{
int imode, x, y, code;
int imode, x, y, i, code, use_vertical_tile;
uint8_t invert, *planep = plane;
int stride= width;
invert = get_bits(&v->gb, 1);
imode = get_vlc2(&v->gb, vc9_imode_vlc.table, VC9_IMODE_VLC_BITS, 2);
@ -717,76 +746,61 @@ static int bitplane_decoding(uint8_t* plane, int width, int height, VC9Context *
{
for (x=0; x<width; x++)
planep[x] = (-get_bits(&v->gb, 1)); //-1=0xFF
planep += width;
planep += stride;
}
invert=0; //spec says ignore invert if raw
break;
case IMODE_DIFF2:
case IMODE_NORM2:
if ((height*width) & 1) *(++planep) = get_bits(&v->gb, 1);
code = get_vlc2(&v->gb, vc9_norm2_vlc.table, VC9_NORM2_VLC_BITS, 2);
*(++planep) = code&1; //lsb => left
*(++planep) = code&2; //msb => right - this is a bitplane, so only !0 matters
for(i=0; i<(height*width)>>1; i++){
code = get_vlc2(&v->gb, vc9_norm2_vlc.table, VC9_NORM2_VLC_BITS, 2);
*(++planep) = code&1; //lsb => left
*(++planep) = code&2; //msb => right - this is a bitplane, so only !0 matters
//FIXME width->stride
}
break;
case IMODE_DIFF6:
case IMODE_NORM6:
use_vertical_tile= height%3==0 && width%3!=0;
if(use_vertical_tile){
}else{
}
av_log(v->avctx, AV_LOG_ERROR, "Imode using Norm-6 isn't supported\n");
return -1;
break;
case IMODE_ROWSKIP:
for (y=0; y<height; y++)
{
if (get_bits(&v->gb, 1)) //rowskip
memset(planep, 0, width);
else for (x=0; x<width; x++) planep[x] = get_bits(&v->gb, 1);
planep += width;
}
decode_rowskip(plane, width, height, stride, v);
break;
case IMODE_COLSKIP: //Teh ugly
for (x=0; x<width; x++)
{
planep = plane;
if (get_bits(&v->gb, 1)) //colskip
{
for (y=0; y<height; y++)
{
planep[x] = 0;
planep += width;
}
}
else
{
for (y=0; y<height; y++)
{
planep[x] = get_bits(&v->gb, 1);
planep += width;
}
}
}
decode_rowskip(plane, width, height, stride, v);
break;
default: break;
}
/* Applying diff operator */
if (imode == IMODE_DIFF2 || imode == IMODE_DIFF2)
if (imode == IMODE_DIFF2 || imode == IMODE_DIFF6)
{
/* And what about j=0 !? */
planep = plane + width;
memset(plane, invert, width);
for (y=0; y<height; y++)
planep = plane;
planep[0] ^= invert;
for (x=1; x<width; x++)
planep[x] ^= planep[x-1];
for (y=1; y<height; y++)
{
planep[0] = planep[-width];
planep += stride;
planep[0] ^= planep[-stride];
for (x=1; x<width; x++)
{
if (planep[x-1] != planep[-width]) planep[x] = invert;
else planep[x] = planep[x-1];
if (planep[x-1] != planep[x-stride]) planep[x] ^= invert;
else planep[x] ^= planep[x-1];
}
planep += width;
}
}
else if (invert)
{
planep = plane;
for (x=0; x<width*height; x++) planep[x] = !planep[x];
for (x=0; x<width*height; x++) planep[x] = !planep[x]; //FIXME stride
}
return 0;
}