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winamp/Src/f263/Picture.cpp
Jef 0954e03b3a Initial community commit
2024-09-24 14:54:57 +02:00

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#include "Decoder.h"
#define sign(a) ((a) < 0 ? -1 : 1)
/* private prototypes*/
static int motion_decode(int vec,int pmv);
static void make_edge_image(const unsigned char *src, unsigned char *dst, int width, int height, int edge);
/* decode one frame or field picture */
void Decoder::getpicture(Frame decodedFrame)
{
int i;
unsigned char *tmp;
for (i=0; i<3; i++)
{
tmp = oldrefframe[i];
oldrefframe[i] = refframe[i];
refframe[i] = tmp;
newframe[i] = refframe[i];
}
if (!firstFrame)
{
make_edge_image(oldrefframe[0],edgeframe[0],coded_picture_width,
coded_picture_height,32);
make_edge_image(oldrefframe[1],edgeframe[1],chrom_width, chrom_height,16);
make_edge_image(oldrefframe[2],edgeframe[2],chrom_width, chrom_height,16);
}
//getMBs();
get_I_P_MBs();
if (deblock)
edge_filter(newframe[0], newframe[1], newframe[2],
coded_picture_width, coded_picture_height);
/*
PostFilter(newframe[0], newframe[1], newframe[2],
coded_picture_width, coded_picture_height);
*/
decodedFrame[0] = newframe[0];
decodedFrame[1] = newframe[1];
decodedFrame[2] = newframe[2];
firstFrame=false;
}
/* decode all macroblocks of the current picture */
void Decoder::clearblock(int comp)
{
int *bp;
int i;
bp = (int *)block[comp];
for (i=0; i<8; i++)
{
bp[0] = bp[1] = bp[2] = bp[3] = 0;
bp += 4;
}
}
/* move/add 8x8-Block from block[comp] to refframe or bframe */
void Decoder::addblock(int comp, int bx, int by, int addflag)
{
int cc,i, iincr;
unsigned char *rfp;
short *bp;
bp = block[comp];
/* TODO: benski>
ippiCopy8x8_8u_C1R (addflag = 0)
ippiAdd8x8_16s8u_C1IRS (addflag = 1)
*/
cc = (comp<4) ? 0 : (comp&1)+1; /* color component index */
if (cc==0)
{
/* luminance */
/* frame DCT coding */
rfp = newframe[0]
+ coded_picture_width*(by+((comp&2)<<2)) + bx + ((comp&1)<<3);
iincr = coded_picture_width;
}
else
{
/* chrominance */
/* scale coordinates */
bx >>= 1;
by >>= 1;
/* frame DCT coding */
rfp = newframe[cc] + chrom_width*by + bx;
iincr = chrom_width;
}
if (addflag)
{
for (i=0; i<8; i++)
{
rfp[0] = clp[bp[0]+rfp[0]];
rfp[1] = clp[bp[1]+rfp[1]];
rfp[2] = clp[bp[2]+rfp[2]];
rfp[3] = clp[bp[3]+rfp[3]];
rfp[4] = clp[bp[4]+rfp[4]];
rfp[5] = clp[bp[5]+rfp[5]];
rfp[6] = clp[bp[6]+rfp[6]];
rfp[7] = clp[bp[7]+rfp[7]];
bp += 8;
rfp+= iincr;
}
}
else
{
for (i=0; i<8; i++)
{
rfp[0] = clp[bp[0]];
rfp[1] = clp[bp[1]];
rfp[2] = clp[bp[2]];
rfp[3] = clp[bp[3]];
rfp[4] = clp[bp[4]];
rfp[5] = clp[bp[5]];
rfp[6] = clp[bp[6]];
rfp[7] = clp[bp[7]];
bp += 8;
rfp += iincr;
}
}
}
int motion_decode(int vec, int pmv)
{
if (vec > 31) vec -= 64;
vec += pmv;
if (vec > 31)
vec -= 64;
if (vec < -32)
vec += 64;
return vec;
}
int Decoder::find_pmv(int x, int y, int block, int comp)
{
int p1,p2,p3;
int xin1,xin2,xin3;
int yin1,yin2,yin3;
int vec1,vec2,vec3;
int l8,o8,or8;
x++;y++;
l8 = (modemap[y][x-1] == MODE_INTER4V ? 1 : 0);
o8 = (modemap[y-1][x] == MODE_INTER4V ? 1 : 0);
or8 = (modemap[y-1][x+1] == MODE_INTER4V ? 1 : 0);
switch (block)
{
case 0:
vec1 = (l8 ? 2 : 0) ; yin1 = y ; xin1 = x-1;
vec2 = (o8 ? 3 : 0) ; yin2 = y-1; xin2 = x;
vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1;
break;
case 1:
vec1 = (l8 ? 2 : 0) ; yin1 = y ; xin1 = x-1;
vec2 = (o8 ? 3 : 0) ; yin2 = y-1; xin2 = x;
vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1;
break;
case 2:
vec1 = 1 ; yin1 = y ; xin1 = x;
vec2 = (o8 ? 4 : 0) ; yin2 = y-1; xin2 = x;
vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1;
break;
case 3:
vec1 = (l8 ? 4 : 0) ; yin1 = y ; xin1 = x-1;
vec2 = 1 ; yin2 = y ; xin2 = x;
vec3 = 2 ; yin3 = y ; xin3 = x;
break;
case 4:
vec1 = 3 ; yin1 = y ; xin1 = x;
vec2 = 1 ; yin2 = y ; xin2 = x;
vec3 = 2 ; yin3 = y ; xin3 = x;
break;
default:
exit(1);
break;
}
p1 = MV[comp][vec1][yin1][xin1];
p2 = MV[comp][vec2][yin2][xin2];
p3 = MV[comp][vec3][yin3][xin3];
if (p2 == NO_VEC)
{
p2 = p3 = p1;
}
return p1+p2+p3 - max(p1,max(p2,p3)) - min(p1,min(p2,p3));
}
void make_edge_image(const unsigned char *src,unsigned char *dst,int width,int height,int edge)
{
int i,j;
unsigned char *p1,*p2,*p3,*p4;
const unsigned char *o1,*o2,*o3,*o4;
/* center image */
p1 = dst;
o1 = src;
for (j = 0; j < height;j++)
{
for (i = 0; i < width; i++)
{
*(p1 + i) = *(o1 + i);
}
p1 += width + (edge<<1);
o1 += width;
}
/* left and right edges */
p1 = dst-1;
o1 = src;
for (j = 0; j < height;j++)
{
for (i = 0; i < edge; i++)
{
*(p1 - i) = *o1;
*(p1 + width + i + 1) = *(o1 + width - 1);
}
p1 += width + (edge<<1);
o1 += width;
}
/* top and bottom edges */
p1 = dst;
p2 = dst + (width + (edge<<1))*(height-1);
o1 = src;
o2 = src + width*(height-1);
for (j = 0; j < edge;j++)
{
p1 = p1 - (width + (edge<<1));
p2 = p2 + (width + (edge<<1));
for (i = 0; i < width; i++)
{
*(p1 + i) = *(o1 + i);
*(p2 + i) = *(o2 + i);
}
}
/* corners */
p1 = dst - (width+(edge<<1)) - 1;
p2 = p1 + width + 1;
p3 = dst + (width+(edge<<1))*(height)-1;
p4 = p3 + width + 1;
o1 = src;
o2 = o1 + width - 1;
o3 = src + width*(height-1);
o4 = o3 + width - 1;
for (j = 0; j < edge; j++)
{
for (i = 0; i < edge; i++)
{
*(p1 - i) = *o1;
*(p2 + i) = *o2;
*(p3 - i) = *o3;
*(p4 + i) = *o4;
}
p1 = p1 - (width + (edge<<1));
p2 = p2 - (width + (edge<<1));
p3 = p3 + width + (edge<<1);
p4 = p4 + width + (edge<<1);
}
}
static bool Mode_IsInter(int Mode)
{
return (Mode == MODE_INTER || Mode == MODE_INTER_Q ||
Mode == MODE_INTER4V || Mode == MODE_INTER4V_Q);
}
static bool Mode_IsIntra(int Mode)
{
return (Mode == MODE_INTRA || Mode == MODE_INTRA_Q);
}
void Decoder::get_I_P_MBs()
{
int comp;
int MBA, MBAmax;
int COD = 0, MCBPC, CBPY, CBP = 0, CBPB = 0, MODB = 0, Mode = 0, DQUANT;
int mvx = 0, mvy = 0, pmv0, pmv1, xpos, ypos, k;
int startmv, stopmv, last_done = 0, pCBP = 0, pCBPB = 0, pCOD = 0, pMODB = 0;
int DQ_tab[4] = {-1, -2, 1, 2};
unsigned int i;
short *bp;
/* number of macroblocks per picture */
MBAmax = mb_width * mb_height;
MBA = 0; /* macroblock address */
xpos = ypos = 0;
/* mark MV's above the picture */
for (i = 1; i < mb_width + 1; i++)
{
for (k = 0; k < 5; k++)
{
MV[0][k][0][i] = NO_VEC;
MV[1][k][0][i] = NO_VEC;
}
modemap[0][i] = MODE_INTRA;
}
/* zero MV's on the sides of the picture */
for (i = 0; i < mb_height + 1; i++)
{
for (k = 0; k < 5; k++)
{
MV[0][k][i][0] = 0;
MV[1][k][i][0] = 0;
MV[0][k][i][mb_width + 1] = 0;
MV[1][k][i][mb_width + 1] = 0;
}
modemap[i][0] = MODE_INTRA;
modemap[i][mb_width + 1] = MODE_INTRA;
}
/* initialize the qcoeff used in advanced intra coding */
fault = 0;
for (;;)
{
resync:
/* This version of the decoder does not resync on every possible
* error, and it does not do all possible error checks. It is not
* difficult to make it much more error robust, but I do not think it
* is necessary to include this in the freely available version. */
if (fault)
{
startcode(); /* sync on new startcode */
fault = 0;
}
xpos = MBA % mb_width;
ypos = MBA / mb_width;
if (MBA >= MBAmax)
{
/* all macroblocks decoded */
return;
}
read_cod:
if (PCT_INTER == pict_type || PCT_DISPOSABLE_INTER == pict_type)
{
COD = buffer.showbits(1);
}
else
{
COD = 0; /* Intra picture -> not skipped */
coded_map[ypos + 1][xpos + 1] = 1;
}
if (!COD)
{
/* COD == 0 --> not skipped */
if (PCT_INTER == pict_type || PCT_DISPOSABLE_INTER == pict_type)
{
/* flush COD bit */
buffer.flushbits(1);
}
if (PCT_INTRA == pict_type)
{
MCBPC = getMCBPCintra();
}
else
{
MCBPC = getMCBPC();
}
if (fault)
goto resync;
if (MCBPC == 255)
{
/* stuffing - read next COD without advancing MB count. */
goto read_cod;
}
else
{
/* normal MB data */
Mode = MCBPC & 7;
/* MODB and CBPB */
CBPY = getCBPY();
}
/* Decode Mode and CBP */
if ((Mode == MODE_INTRA || Mode == MODE_INTRA_Q))
{
/* Intra */
coded_map[ypos + 1][xpos + 1] = 1;
CBPY = CBPY ^ 15; /* needed in huffman coding only */
}
CBP = (CBPY << 2) | (MCBPC >> 4);
if (Mode == MODE_INTER_Q || Mode == MODE_INTRA_Q || Mode == MODE_INTER4V_Q)
{
/* Read DQUANT if necessary */
DQUANT = buffer.getbits(2);
quant += DQ_tab[DQUANT];
if (quant > 31 || quant < 1)
{
quant = max(1, (31, quant));
/* could set fault-flag and resync here */
fault = 1;
}
}
/* motion vectors */
if (Mode == MODE_INTER || Mode == MODE_INTER_Q ||
Mode == MODE_INTER4V || Mode == MODE_INTER4V_Q)
{
if (Mode == MODE_INTER4V || Mode == MODE_INTER4V_Q)
{
startmv = 1;
stopmv = 4;
}
else
{
startmv = 0;
stopmv = 0;
}
for (k = startmv; k <= stopmv; k++)
{
mvx = getTMNMV();
mvy = getTMNMV();
pmv0 = find_pmv(xpos, ypos, k, 0);
pmv1 = find_pmv(xpos, ypos, k, 1);
mvx = motion_decode(mvx, pmv0);
mvy = motion_decode(mvy, pmv1);
/* store coded or not-coded */
coded_map[ypos + 1][xpos + 1] = 1;
MV[0][k][ypos+1][xpos+1] = mvx;
MV[1][k][ypos+1][xpos+1] = mvy;
}
}
/* Intra. */
else
{
}
if (fault)
goto resync;
}
else
{
/* COD == 1 --> skipped MB */
if (MBA >= MBAmax)
{
/* all macroblocks decoded */
return;
}
if (PCT_INTER == pict_type || PCT_DISPOSABLE_INTER == pict_type)
buffer.flushbits(1);
Mode = MODE_INTER;
/* Reset CBP */
CBP = CBPB = 0;
coded_map[ypos + 1][xpos + 1] = 0;
/* reset motion vectors */
MV[0][0][ypos + 1][xpos + 1] = 0;
MV[1][0][ypos + 1][xpos + 1] = 0;
}
/* Store mode and prediction type */
modemap[ypos + 1][xpos + 1] = Mode;
/* store defaults for advanced intra coding mode */
if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
{
MV[0][0][ypos + 1][xpos + 1] = MV[1][0][ypos + 1][xpos + 1] = 0;
}
if (!COD)
{
Mode = modemap[ypos + 1][xpos + 1];
/* decode blocks */
for (comp = 0; comp < 6; comp++)
{
clearblock(comp);
if ((Mode == MODE_INTRA || Mode == MODE_INTRA_Q))
{
/* Intra (except in advanced intra coding mode) */
bp = block[comp];
bp[0] = buffer.getbits(8);
if (bp[0] == 255) /* Spec. in H.26P, not in TMN4 */
bp[0] = 128;
bp[0] *= 8; /* Iquant */
if ((CBP & (1 << (6 - 1 - comp))))
{
getblock(comp, 0);
}
}
else
{
/* Inter (or Intra in advanced intra coding mode) */
if ((CBP & (1 << (6 - 1 - comp))))
{
getblock(comp, 1);
}
}
if (fault)
goto resync;
}
}
/* decode the last MB if data is missing */
/* advance to next macroblock */
MBA++;
pCBP = CBP;
pCBPB = CBPB;
pCOD = COD;
pMODB = MODB;
quant_map[ypos + 1][xpos + 1] = quant;
int bx = 16 * xpos;
int by = 16 * ypos;
Mode = modemap[by / 16 + 1][bx / 16 + 1];
/* motion compensation for P-frame */
if (Mode == MODE_INTER || Mode == MODE_INTER_Q ||
Mode == MODE_INTER4V || Mode == MODE_INTER4V_Q)
{
reconstruct(bx, by, Mode);
}
/* copy or add block data into P-picture */
for (comp = 0; comp < 6; comp++)
{
/* inverse DCT */
if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
{
idct.idct(block[comp]);
addblock(comp, bx, by, 0);
}
else if ((pCBP & (1 << (6 - 1 - comp))))
{
/* No need to to do this for blocks with no coeffs */
idct.idct(block[comp]);
addblock(comp, bx, by, 1);
}
}
}
}
static int STRENGTH[] = {1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12};
void Decoder::horiz_edge_filter(unsigned char *rec, int width, int height, int chr)
{
int i, j;
int delta, d1, d2;
int mbc, mbr, do_filter;
int QP;
int mbr_above;
/* horizontal edges */
for (j = 8; j < height; j += 8)
{
if (!chr)
{
mbr = j >> 4;
mbr_above = (j - 8) >> 4;
}
else
{
mbr = j >> 3;
mbr_above = mbr - 1;
}
const int * const cur_coded_map = coded_map[mbr + 1];
for (i = 0; i < width; i++)
{
// TODO: replace all below with FilterDeblocking8x8HorEdge_H263(rec+i+(j+1)*width, width, QP) and i+=8 ?
if (!chr)
{
mbc = i >> 4;
}
else
{
mbc = i >> 3;
}
do_filter = cur_coded_map[mbc + 1] || coded_map[mbr_above + 1][mbc + 1];
if (do_filter)
{
QP = cur_coded_map[mbc + 1] ? quant_map[mbr + 1][mbc + 1] : quant_map[mbr_above + 1][mbc + 1];
delta = (int)(((int)(*(rec + i + (j - 2) * width)) +
(int)(*(rec + i + (j - 1) * width) * (-4)) +
(int)(*(rec + i + (j) * width) * (4)) +
(int)(*(rec + i + (j + 1) * width) * (-1))) / 8.0);
d1 = sign(delta) * max(0, abs(delta) - max(0, 2 * (abs(delta) - STRENGTH[QP - 1])));
d2 = min(abs(d1 / 2), max(-abs(d1 / 2), (int)(((*(rec + i + (j - 2) * width) -
*(rec + i + (j + 1) * width))) / 4)));
*(rec + i + (j + 1) * width) += d2; /* D */
*(rec + i + (j) * width) = min(255, max(0, (int)(*(rec + i + (j) * width)) - d1)); /* C */
*(rec + i + (j - 1) * width) = min(255, max(0, (int)(*(rec + i + (j - 1) * width)) + d1)); /* B */
*(rec + i + (j - 2) * width) -= d2; /* A */
}
}
}
return;
}
void Decoder::vert_edge_filter(unsigned char *rec, int width, int height, int chr)
{
int i, j;
int delta, d1, d2;
int mbc, mbr;
int do_filter;
int QP;
int mbc_left;
/* vertical edges */
for (i = 8; i < width; i += 8)
{
if (!chr)
{
mbc = i >> 4;
mbc_left = (i - 8) >> 4;
}
else
{
mbc = i >> 3;
mbc_left = mbc - 1;
}
// TODO: replace all below with FilterDeblocking8x8VerEdge_H263(rec+i +j*width, width, QP) and i+=8 ?
for (j = 0; j < height; j++)
{
if (!chr)
{
mbr = j >> 4;
}
else
{
mbr = j >> 3;
}
do_filter = coded_map[mbr + 1][mbc + 1] || coded_map[mbr + 1][mbc_left + 1];
if (do_filter)
{
QP = coded_map[mbr + 1][mbc + 1] ?
quant_map[mbr + 1][mbc + 1] : quant_map[mbr + 1][mbc_left + 1];
delta = (int)(((int)(*(rec + i - 2 + j * width)) +
(int)(*(rec + i - 1 + j * width) * (-4)) +
(int)(*(rec + i + j * width) * (4)) +
(int)(*(rec + i + 1 + j * width) * (-1))) / 8.0);
d1 = sign(delta) * max(0, abs(delta) -
max(0, 2 * (abs(delta) - STRENGTH[QP - 1])));
d2 = min(abs(d1 / 2), max(-abs(d1 / 2),
(int)((*(rec + i - 2 + j * width) -
*(rec + i + 1 + j * width)) / 4)));
*(rec + i + 1 + j * width) += d2; /* D */
*(rec + i + j * width) = min(255, max(0, (int)(*(rec + i + j * width)) - d1)); /* C */
*(rec + i - 1 + j * width) = min(255, max(0, (int)(*(rec + i - 1 + j * width)) + d1)); /* B */
*(rec + i - 2 + j * width) -= d2; /* A */
}
}
}
return;
}
void Decoder::edge_filter(unsigned char *lum, unsigned char *Cb, unsigned char *Cr, int width, int height)
{
/* Luma */
horiz_edge_filter(lum, width, height, 0);
vert_edge_filter(lum, width, height, 0);
/* Chroma */
horiz_edge_filter(Cb, width / 2, height / 2, 1);
vert_edge_filter(Cb, width / 2, height / 2, 1);
horiz_edge_filter(Cr, width / 2, height / 2, 1);
vert_edge_filter(Cr, width / 2, height / 2, 1);
/* that's it */
return;
}
void Decoder::PostFilter(unsigned char *lum, unsigned char *Cb, unsigned char *Cr,
int width, int height)
{
/* Luma */
horiz_post_filter(lum, width, height, 0);
vert_post_filter(lum, width, height, 0);
/* Chroma */
horiz_post_filter(Cb, width / 2, height / 2, 1);
vert_post_filter(Cb, width / 2, height / 2, 1);
horiz_post_filter(Cr, width / 2, height / 2, 1);
vert_post_filter(Cr, width / 2, height / 2, 1);
/* that's it */
return;
}
/***********************************************************************/
static int STRENGTH1[] = {1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4};
void Decoder::horiz_post_filter(unsigned char *rec, int width, int height, int chr)
{
int i, j;
int delta, d1;
int mbc, mbr;
int QP;
int mbr_above;
/* horizontal edges */
for (j = 8; j < height; j += 8)
{
for (i = 0; i < width; i++)
{
if (!chr)
{
mbr = j >> 4;
mbc = i >> 4;
mbr_above = (j - 8) >> 4;
}
else
{
mbr = j >> 3;
mbc = i >> 3;
mbr_above = mbr - 1;
}
QP = coded_map[mbr + 1][mbc + 1] ?
quant_map[mbr + 1][mbc + 1] : quant_map[mbr_above + 1][mbc + 1];
delta = (int)(((int)(*(rec + i + (j - 3) * width)) +
(int)(*(rec + i + (j - 2) * width)) +
(int)(*(rec + i + (j - 1) * width)) +
(int)(*(rec + i + (j) * width) * (-6)) +
(int)(*(rec + i + (j + 1) * width)) +
(int)(*(rec + i + (j + 2) * width)) +
(int)(*(rec + i + (j + 3) * width))) / 8.0);
d1 = sign(delta) * max(0, abs(delta) - max(0, 2 * (abs(delta) - STRENGTH1[QP - 1])));
/* Filter D */
*(rec + i + (j) * width) += d1;
}
}
return;
}
static int STRENGTH2[] = {1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3};
void Decoder::vert_post_filter(unsigned char *rec, int width, int height, int chr)
{
int i, j;
int delta, d1;
int mbc, mbr;
int QP;
int mbc_left;
/* vertical edges */
for (i = 8; i < width; i += 8)
{
for (j = 0; j < height; j++)
{
if (!chr)
{
mbr = j >> 4;
mbc = i >> 4;
mbc_left = (i - 8) >> 4;
}
else
{
mbr = j >> 3;
mbc = i >> 3;
mbc_left = mbc - 1;
}
QP = coded_map[mbr + 1][mbc + 1] ?
quant_map[mbr + 1][mbc + 1] : quant_map[mbr + 1][mbc_left + 1];
delta = (int)(((int)(*(rec + i - 3 + j * width)) +
(int)(*(rec + i - 2 + j * width)) +
(int)(*(rec + i - 1 + j * width)) +
(int)(*(rec + i + j * width) * (-6)) +
(int)(*(rec + i + 1 + j * width)) +
(int)(*(rec + i + 2 + j * width)) +
(int)(*(rec + i + 3 + j * width))) / 8.0);
d1 = sign(delta) * max(0, abs(delta) - max(0, 2 * (abs(delta) - STRENGTH2[QP - 1])));
/* Post Filter D */
*(rec + i + j * width) += d1;
}
}
return;
}
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