void next_start_code()
{
/* byte align */
Flush_Buffer(ld->Incnt&7);
while (Show_Bits(24)!=0x01L)
Flush_Buffer(8);
}
int
Get_motion_code ()
{
int code;
if (Get_Bits1 ())
{
return 0;
}
if ((code = Show_Bits (9)) >= 64)
{
code >>= 6;
Flush_Buffer (MVtab0[code][1]);
return Get_Bits1 ()? -MVtab0[code][0] : MVtab0[code][0];
}
static int Get_P_macroblock_type()
{
int code;
#ifdef TRACE
if (Trace_Flag)
printf("macroblock_type(P) (");
#endif /* TRACE */
if ((code = Show_Bits(6))>=8)
{
code >>= 3;
Flush_Buffer(PMBtab0[code].len);
#ifdef TRACE
if (Trace_Flag)
{
Print_Bits(code,3,PMBtab0[code].len);
printf("): %s (%d)\n",MBdescr[PMBtab0[code].val],PMBtab0[code].val);
}
#endif /* TRACE */
return PMBtab0[code].val;
}
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);
}
}
