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authorMichael Niedermayer <michaelni@gmx.at>2005-01-24 00:35:18 +0000
committerMichael Niedermayer <michaelni@gmx.at>2005-01-24 00:35:18 +0000
commitd29f0cd9c1b00dba31ee6e6ecb99fd0819c26857 (patch)
tree9d158bb0dc23435c7d0b83f88ea09b59cf0ff2c8
parente90256000519d7b6af4f668bf1c207894027786d (diff)
downloadffmpeg-d29f0cd9c1b00dba31ee6e6ecb99fd0819c26857.tar.gz
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
-rw-r--r--libavcodec/vc9.c98
1 files changed, 56 insertions, 42 deletions
diff --git a/libavcodec/vc9.c b/libavcodec/vc9.c
index aa753e09f0..675773c68c 100644
--- a/libavcodec/vc9.c
+++ b/libavcodec/vc9.c
@@ -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;
}