unsigned short* rl2blk(int *blk,unsigned short *mdec_rl) {
int i,k,q_scale,rl;
int *iqtab;
memset (blk, 0, 6*DCTSIZE2*4);
iqtab = iq_uv;
for(i=0;i<6;i++) { // decode blocks (Cr,Cb,Y1,Y2,Y3,Y4)
if (i>1) iqtab = iq_y;
// zigzag transformation
rl = *mdec_rl++;
q_scale = RUNOF(rl);
blk[0] = iqtab[0]*VALOF(rl);
for(k = 0;;) {
rl = *mdec_rl++;
if (rl==NOP) break;
k += RUNOF(rl)+1; // skip level zero-coefficients
if (k > 63) break;
blk[zscan[k]] = (VALOF(rl) * iqtab[k] * q_scale) / 8; // / 16;
}
idct(blk,k+1);
blk+=DCTSIZE2;
}
return mdec_rl;
}
int DecDCTvlc(u_short *mdec_bs,u_short *mdec_rl)
{
// u_short *mdec_bs = mdecbs,*mdec_rl = mdecrl
u_short *rl_end;
u_long bitbuf;
int incnt; /* 16-有効bit数 x86=char risc = long */
int q_code;
int type,n;
int last_dc[3];
/* BS_HDR u_short rlsize,magic,ver,q_scale */
//printf("%04x,%04x,",mdec_bs[0],mdec_bs[1]);
*(long*)mdec_rl=*(long*)mdec_bs;
mdec_rl+=2;
rl_end = mdec_rl+(int)mdec_bs[0]*2;
q_code = (mdec_bs[2]<<10); /* code = q */
type = mdec_bs[3];
mdec_bs+=4;
Init_Buffer();
n = 0;
last_dc[0]=last_dc[1]=last_dc[2] = 0;
while(mdec_rl<rl_end) {
u_long code2;
/* DC */
if (type==2) {
code2 = Show_Bits(10)|(10<<16); /* DC code */
} else {
code2 = Show_Bits(6);
if (n>=2) {
/* Y */
if (code2<48) {
code2 = DC_Ytab0[code2];
code2 = (code2&0xffff0000)|((last_dc[2]+=VALOF(code2)*4)&0x3ff);
} else {
int nbit,val;
int bit = 3;
while(Show_Bits(bit)&1) { bit++;}
bit++;
nbit = bit*2-1;
val = Show_Bits(nbit)&((1<<bit)-1);
if ((val&(1<<(bit-1)))==0)
val -= (1<<bit)-1;
val = (last_dc[2]+=val*4);
code2 = (nbit<<16) | (val&0x3ff);
}
//printf("%d ",last_dc[2]);
} else {
/* U,V */
if (code2<56) {
code2 = DC_UVtab0[code2];
code2 = (code2&0xffff0000)|((last_dc[n]+=VALOF(code2)*4)&0x3ff);
} else {
int nbit,val;
int bit = 4;
while(Show_Bits(bit)&1) { bit++;}
nbit = bit*2;
val = Show_Bits(nbit)&((1<<bit)-1);
if ((val&(1<<(bit-1)))==0)
val -= (1<<bit)-1;
val = (last_dc[n]+=val*4);
code2 = (nbit<<16) | (val&0x3ff);
}
//printf("%d ",last_dc[n]);
}
if (++n==6) n=0;
}
// printf("%d ",VALOF(code2));
code2 |= q_code;
/* AC */
for(;;){
// u_long code;
#define code code2
#define SBIT 17
*mdec_rl++=code2;
Flush_Buffer(BITOF(code2));
code = Show_Bits(SBIT);
if (code>=1<<(SBIT- 2)) {
code2 = VLCtabnext[(code>>12)-8];
if (code2==EOB_CODE) break;
}
else if (code>=1<<(SBIT- 6)) {
code2 = VLCtab0[(code>>8)-8];
if (code2==ESCAPE_CODE) {
Flush_Buffer(6); /* ESCAPE len */
code2 = Show_Bits(16)| (16<<16);
}
}
