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/*
wrapper for dcts
Copyright (C) 2001 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "dct.h"
#include "common.h"
ATTR_ALIGN(64) static REAL hsec_12[3];
ATTR_ALIGN(64) static REAL cos2_6=cos(PI/6.0*2.0);
ATTR_ALIGN(64) static REAL cos1_6=cos(PI/6.0*1.0);
ATTR_ALIGN(64) static REAL hsec_36[9];
ATTR_ALIGN(64) static REAL cos_18[9];
/**
This was some time ago a standalone dct class,
but to get more speed I made it an inline dct
int the filter classes
*/
static int dct36_12Init=false;
void initialize_dct12_dct36() {
if (dct36_12Init==true) {
return;
}
dct36_12Init=true;
int i;
for(i=0;i<3;i++)
hsec_12[i]=0.5/cos(double(i*2+1)* PI_12);
for(i=0;i<9;i++)
hsec_36[i]=0.5/cos(double(i*2+1)* PI_36);
for(i=0;i<9;i++)
cos_18[i]=cos(PI_18*double(i));
}
inline void dct36(REAL *inbuf,REAL *prevblk1,
REAL *prevblk2,REAL *wi,REAL *out){
#define MACRO0(v) { \
REAL tmp; \
out2[9+(v)]=(tmp=sum0+sum1)*wi[27+(v)]; \
out2[8-(v)]=tmp * wi[26-(v)]; } \
sum0-=sum1; \
ts[SBLIMIT*(8-(v))]=out1[8-(v)]+sum0*wi[8-(v)]; \
ts[SBLIMIT*(9+(v))]=out1[9+(v)]+sum0*wi[9+(v)];
#define MACRO1(v) { \
REAL sum0,sum1; \
sum0=tmp1a+tmp2a; \
sum1=(tmp1b+tmp2b)*hsec_36[(v)]; \
MACRO0(v); }
#define MACRO2(v) { \
REAL sum0,sum1; \
sum0=tmp2a-tmp1a; \
sum1=(tmp2b-tmp1b) * hsec_36[(v)]; \
MACRO0(v); }
{
REAL *in = inbuf;
in[17]+=in[16];in[16]+=in[15];in[15]+=in[14];in[14]+=in[13];
in[13]+=in[12];in[12]+=in[11];in[11]+=in[10];in[10]+=in[ 9];
in[ 9]+=in[ 8];in[ 8]+=in[ 7];in[ 7]+=in[ 6];in[ 6]+=in[ 5];
in[ 5]+=in[ 4];in[ 4]+=in[ 3];in[ 3]+=in[ 2];in[ 2]+=in[ 1];
in[ 1]+=in[ 0];
in[17]+=in[15];in[15]+=in[13];in[13]+=in[11];in[11]+=in[ 9];
in[ 9]+=in[ 7];in[7] +=in[ 5];in[ 5]+=in[ 3];in[ 3]+=in[ 1];
{
REAL *c = cos_18;
REAL *out2 = prevblk2;
REAL *out1 = prevblk1;
REAL *ts = out;
REAL ta33,ta66,tb33,tb66;
ta33=in[2*3+0]*c[3];
ta66=in[2*6+0]*c[6];
tb33=in[2*3+1]*c[3];
tb66=in[2*6+1]*c[6];
{
REAL tmp1a,tmp2a,tmp1b,tmp2b;
tmp1a= in[2*1+0]*c[1]+ta33 +in[2*5+0]*c[5]+in[2*7+0]*c[7];
tmp1b= in[2*1+1]*c[1]+tb33 +in[2*5+1]*c[5]+in[2*7+1]*c[7];
tmp2a=in[2*0+0]+in[2*2+0]*c[2]+in[2*4+0]*c[4]+ta66 +in[2*8+0]*c[8];
tmp2b=in[2*0+1]+in[2*2+1]*c[2]+in[2*4+1]*c[4]+tb66 +in[2*8+1]*c[8];
MACRO1(0);
MACRO2(8);
}
{
REAL tmp1a,tmp2a,tmp1b,tmp2b;
tmp1a=(in[2*1+0]-in[2*5+0]-in[2*7+0])*c[3];
tmp1b=(in[2*1+1]-in[2*5+1]-in[2*7+1])*c[3];
tmp2a=(in[2*2+0]-in[2*4+0]-in[2*8+0])*c[6]-in[2*6+0]+in[2*0+0];
tmp2b=(in[2*2+1]-in[2*4+1]-in[2*8+1])*c[6]-in[2*6+1]+in[2*0+1];
MACRO1(1);
MACRO2(7);
}
{
REAL tmp1a,tmp2a,tmp1b,tmp2b;
tmp1a= in[2*1+0]*c[5]-ta33 -in[2*5+0]*c[7]+in[2*7+0]*c[1];
tmp1b= in[2*1+1]*c[5]-tb33 -in[2*5+1]*c[7]+in[2*7+1]*c[1];
tmp2a=in[2*0+0]-in[2*2+0]*c[8]-in[2*4+0]*c[2]+ta66 +in[2*8+0]*c[4];
tmp2b=in[2*0+1]-in[2*2+1]*c[8]-in[2*4+1]*c[2]+tb66 +in[2*8+1]*c[4];
MACRO1(2);
MACRO2(6);
}
{
REAL tmp1a,tmp2a,tmp1b,tmp2b;
tmp1a= in[2*1+0]*c[7]-ta33 +in[2*5+0]*c[1]-in[2*7+0]*c[5];
tmp1b= in[2*1+1]*c[7]-tb33 +in[2*5+1]*c[1]-in[2*7+1]*c[5];
tmp2a=in[2*0+0]-in[2*2+0]*c[4]+in[2*4+0]*c[8]+ta66 -in[2*8+0]*c[2];
tmp2b=in[2*0+1]-in[2*2+1]*c[4]+in[2*4+1]*c[8]+tb66 -in[2*8+1]*c[2];
MACRO1(3);
MACRO2(5);
}
{
REAL sum0,sum1;
sum0= in[2*0+0]-in[2*2+0]+in[2*4+0]-in[2*6+0]+in[2*8+0];
sum1=(in[2*0+1]-in[2*2+1]+in[2*4+1]-in[2*6+1]+in[2*8+1])*hsec_36[4];
MACRO0(4);
}
}
}
}
inline void dct12(REAL *in,REAL *prevblk1,REAL *prevblk2,REAL *wi,REAL *out) {
#define DCT12_PART1 \
in5=in[5*3]; \
in5+=(in4=in[4*3]); \
in4+=(in3=in[3*3]); \
in3+=(in2=in[2*3]); \
in2+=(in1=in[1*3]); \
in1+=(in0=in[0*3]); \
\
in5+=in3;in3+=in1; \
\
in2*=cos1_6; \
in3*=cos1_6;
#define DCT12_PART2 \
in0+=in4*cos2_6; \
\
in4=in0+in2; \
in0-=in2; \
\
in1+=in5*cos2_6; \
\
in5=(in1+in3)*hsec_12[0]; \
in1=(in1-in3)*hsec_12[2]; \
\
in3=in4+in5; \
in4-=in5; \
\
in2=in0+in1; \
in0-=in1;
{
REAL in0,in1,in2,in3,in4,in5;
REAL *pb1=prevblk1;
out[SBLIMIT*0]=pb1[0];out[SBLIMIT*1]=pb1[1];out[SBLIMIT*2]=pb1[2];
out[SBLIMIT*3]=pb1[3];out[SBLIMIT*4]=pb1[4];out[SBLIMIT*5]=pb1[5];
DCT12_PART1;
{
REAL tmp0,tmp1=(in0-in4);
{
REAL tmp2=(in1-in5)*hsec_12[1];
tmp0=tmp1+tmp2;
tmp1-=tmp2;
}
out[(17-1)*SBLIMIT]=pb1[17-1]+tmp0*wi[11-1];
out[(12+1)*SBLIMIT]=pb1[12+1]+tmp0*wi[ 6+1];
out[(6 +1)*SBLIMIT]=pb1[6 +1]+tmp1*wi[ 1 ];
out[(11-1)*SBLIMIT]=pb1[11-1]+tmp1*wi[ 5-1];
}
DCT12_PART2;
out[(17-0)*SBLIMIT]=pb1[17-0]+in2*wi[11-0];
out[(12+0)*SBLIMIT]=pb1[12+0]+in2*wi[ 6+0];
out[(12+2)*SBLIMIT]=pb1[12+2]+in3*wi[ 6+2];
out[(17-2)*SBLIMIT]=pb1[17-2]+in3*wi[11-2];
out[( 6+0)*SBLIMIT]=pb1[ 6+0]+in0*wi[0];
out[(11-0)*SBLIMIT]=pb1[11-0]+in0*wi[5-0];
out[( 6+2)*SBLIMIT]=pb1[ 6+2]+in4*wi[2];
out[(11-2)*SBLIMIT]=pb1[11-2]+in4*wi[5-2];
}
in++;
{
REAL in0,in1,in2,in3,in4,in5;
REAL *pb2 = prevblk2;
DCT12_PART1;
{
REAL tmp0,tmp1=(in0-in4);
{
REAL tmp2=(in1-in5)*hsec_12[1];
tmp0=tmp1+tmp2;
tmp1-=tmp2;
}
pb2[5-1]=tmp0*wi[11-1];
pb2[0+1]=tmp0*wi[6+1];
out[(12+1)*SBLIMIT]+=tmp1*wi[1];
out[(17-1)*SBLIMIT]+=tmp1*wi[5-1];
}
DCT12_PART2;
pb2[5-0]=in2*wi[11-0];
pb2[0+0]=in2*wi[6+0];
pb2[0+2]=in3*wi[6+2];
pb2[5-2]=in3*wi[11-2];
out[(12+0)*SBLIMIT]+=in0*wi[0];
out[(17-0)*SBLIMIT]+=in0*wi[5-0];
out[(12+2)*SBLIMIT]+=in4*wi[2];
out[(17-2)*SBLIMIT]+=in4*wi[5-2];
}
in++;
{
REAL in0,in1,in2,in3,in4,in5;
REAL *pb2 = prevblk2;
pb2[12]=pb2[13]=pb2[14]=pb2[15]=pb2[16]=pb2[17]=0.0;
DCT12_PART1;
{
REAL tmp0,tmp1=(in0-in4);
{
REAL tmp2=(in1-in5)*hsec_12[1];
tmp0=tmp1+tmp2;
tmp1-=tmp2;
}
pb2[11-1]=tmp0*wi[11-1];
pb2[ 6+1]=tmp0*wi[6+1];
pb2[ 0+1]+=tmp1*wi[1];
pb2[ 5-1]+=tmp1*wi[5-1];
}
DCT12_PART2;
pb2[11-0]=in2*wi[11-0];
pb2[ 6+0]=in2*wi[ 6+0];
pb2[ 6+2]=in3*wi[ 6+2];
pb2[11-2]=in3*wi[11-2];
pb2[ 0+0]+=in0*wi[0 ];
pb2[ 5-0]+=in0*wi[5-0];
pb2[ 0+2]+=in4*wi[2 ];
pb2[ 5-2]+=in4*wi[5-2];
}
}
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