ref: a742a736550c4fc1120c06832749bced0a209e1b
dir: /vp8/encoder/dct.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <math.h>
#include "vpx_ports/config.h"
#if CONFIG_INT_8X8FDCT
static const int xC1S7 = 16069;
static const int xC2S6 = 15137;
static const int xC3S5 = 13623;
static const int xC4S4 = 11585;
static const int xC5S3 = 9102;
static const int xC6S2 = 6270;
static const int xC7S1 = 3196;
#define SHIFT_BITS 14
#define DOROUND(X) X += (1<<(SHIFT_BITS-1));
#define FINAL_SHIFT 3
#define FINAL_ROUNDING (1<<(FINAL_SHIFT -1))
#define IN_SHIFT (FINAL_SHIFT+1)
void vp8_short_fdct8x8_c ( short * InputData, short * OutputData, int pitch)
{
int loop;
int short_pitch = pitch>>1;
int is07, is12, is34, is56;
int is0734, is1256;
int id07, id12, id34, id56;
int irot_input_x, irot_input_y;
int icommon_product1; // Re-used product (c4s4 * (s12 - s56))
int icommon_product2; // Re-used product (c4s4 * (d12 + d56))
int temp1, temp2; // intermediate variable for computation
int InterData[64];
int *ip = InterData;
short *op = OutputData;
for (loop = 0; loop < 8; loop++)
{
// Pre calculate some common sums and differences.
is07 = (InputData[0] + InputData[7])<<IN_SHIFT;
is12 = (InputData[1] + InputData[2])<<IN_SHIFT;
is34 = (InputData[3] + InputData[4])<<IN_SHIFT;
is56 = (InputData[5] + InputData[6])<<IN_SHIFT;
id07 = (InputData[0] - InputData[7])<<IN_SHIFT;
id12 = (InputData[1] - InputData[2])<<IN_SHIFT;
id34 = (InputData[3] - InputData[4])<<IN_SHIFT;
id56 = (InputData[5] - InputData[6])<<IN_SHIFT;
is0734 = is07 + is34;
is1256 = is12 + is56;
// Pre-Calculate some common product terms.
icommon_product1 = xC4S4*(is12 - is56);
DOROUND(icommon_product1)
icommon_product1>>=SHIFT_BITS;
icommon_product2 = xC4S4*(id12 + id56);
DOROUND(icommon_product2)
icommon_product2>>=SHIFT_BITS;
ip[0] = (xC4S4*(is0734 + is1256));
DOROUND(ip[0]);
ip[0] >>= SHIFT_BITS;
ip[4] = (xC4S4*(is0734 - is1256));
DOROUND(ip[4]);
ip[4] >>= SHIFT_BITS;
// Define inputs to rotation for outputs 2 and 6
irot_input_x = id12 - id56;
irot_input_y = is07 - is34;
// Apply rotation for outputs 2 and 6.
temp1=xC6S2*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC2S6*irot_input_y;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
ip[2] = temp1 + temp2;
temp1=xC6S2*irot_input_y;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC2S6*irot_input_x ;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
ip[6] = temp1 -temp2 ;
// Define inputs to rotation for outputs 1 and 7
irot_input_x = icommon_product1 + id07;
irot_input_y = -( id34 + icommon_product2 );
// Apply rotation for outputs 1 and 7.
temp1=xC1S7*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC7S1*irot_input_y;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
ip[1] = temp1 - temp2;
temp1=xC7S1*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC1S7*irot_input_y ;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
ip[7] = temp1 + temp2 ;
// Define inputs to rotation for outputs 3 and 5
irot_input_x = id07 - icommon_product1;
irot_input_y = id34 - icommon_product2;
// Apply rotation for outputs 3 and 5.
temp1=xC3S5*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC5S3*irot_input_y ;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
ip[3] = temp1 - temp2 ;
temp1=xC5S3*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC3S5*irot_input_y;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
ip[5] = temp1 + temp2;
// Increment data pointer for next row
InputData += short_pitch ;
ip += 8;
}
// Performed DCT on rows, now transform the columns
ip = InterData;
for (loop = 0; loop < 8; loop++)
{
// Pre calculate some common sums and differences.
is07 = ip[0 * 8] + ip[7 * 8];
is12 = ip[1 * 8] + ip[2 * 8];
is34 = ip[3 * 8] + ip[4 * 8];
is56 = ip[5 * 8] + ip[6 * 8];
id07 = ip[0 * 8] - ip[7 * 8];
id12 = ip[1 * 8] - ip[2 * 8];
id34 = ip[3 * 8] - ip[4 * 8];
id56 = ip[5 * 8] - ip[6 * 8];
is0734 = is07 + is34;
is1256 = is12 + is56;
// Pre-Calculate some common product terms
icommon_product1 = xC4S4*(is12 - is56) ;
icommon_product2 = xC4S4*(id12 + id56) ;
DOROUND(icommon_product1)
DOROUND(icommon_product2)
icommon_product1>>=SHIFT_BITS;
icommon_product2>>=SHIFT_BITS;
temp1 = xC4S4*(is0734 + is1256) ;
temp2 = xC4S4*(is0734 - is1256) ;
DOROUND(temp1);
DOROUND(temp2);
temp1>>=SHIFT_BITS;
temp2>>=SHIFT_BITS;
op[0*8] = (temp1 + FINAL_ROUNDING)>>FINAL_SHIFT;
op[4*8] = (temp2 + FINAL_ROUNDING)>>FINAL_SHIFT;
// Define inputs to rotation for outputs 2 and 6
irot_input_x = id12 - id56;
irot_input_y = is07 - is34;
// Apply rotation for outputs 2 and 6.
temp1=xC6S2*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC2S6*irot_input_y;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
op[2*8] = (temp1 + temp2 + FINAL_ROUNDING)>>FINAL_SHIFT;
temp1=xC6S2*irot_input_y;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC2S6*irot_input_x ;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
op[6*8] = (temp1 -temp2 + FINAL_ROUNDING)>>FINAL_SHIFT ;
// Define inputs to rotation for outputs 1 and 7
irot_input_x = icommon_product1 + id07;
irot_input_y = -( id34 + icommon_product2 );
// Apply rotation for outputs 1 and 7.
temp1=xC1S7*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC7S1*irot_input_y;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
op[1*8] = (temp1 - temp2 + FINAL_ROUNDING)>>FINAL_SHIFT;
temp1=xC7S1*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC1S7*irot_input_y ;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
op[7*8] = (temp1 + temp2 + FINAL_ROUNDING)>>FINAL_SHIFT;
// Define inputs to rotation for outputs 3 and 5
irot_input_x = id07 - icommon_product1;
irot_input_y = id34 - icommon_product2;
// Apply rotation for outputs 3 and 5.
temp1=xC3S5*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC5S3*irot_input_y ;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
op[3*8] = (temp1 - temp2 + FINAL_ROUNDING)>>FINAL_SHIFT ;
temp1=xC5S3*irot_input_x;
DOROUND(temp1);
temp1>>=SHIFT_BITS;
temp2=xC3S5*irot_input_y;
DOROUND(temp2);
temp2>>=SHIFT_BITS;
op[5*8] = (temp1 + temp2 + FINAL_ROUNDING)>>FINAL_SHIFT;
// Increment data pointer for next column.
ip ++;
op ++;
}
}
#else
void vp8_short_fdct8x8_c(short *block, short *coefs, int pitch)
{
int j1, i, j, k;
float b[8];
float b1[8];
float d[8][8];
float f0 = (float) .7071068;
float f1 = (float) .4903926;
float f2 = (float) .4619398;
float f3 = (float) .4157348;
float f4 = (float) .3535534;
float f5 = (float) .2777851;
float f6 = (float) .1913417;
float f7 = (float) .0975452;
pitch = pitch / 2;
for (i = 0, k = 0; i < 8; i++, k += pitch)
{
for (j = 0; j < 8; j++)
{
b[j] = (float)( block[k + j]<<3);
}
/* Horizontal transform */
for (j = 0; j < 4; j++)
{
j1 = 7 - j;
b1[j] = b[j] + b[j1];
b1[j1] = b[j] - b[j1];
}
b[0] = b1[0] + b1[3];
b[1] = b1[1] + b1[2];
b[2] = b1[1] - b1[2];
b[3] = b1[0] - b1[3];
b[4] = b1[4];
b[5] = (b1[6] - b1[5]) * f0;
b[6] = (b1[6] + b1[5]) * f0;
b[7] = b1[7];
d[i][0] = (b[0] + b[1]) * f4;
d[i][4] = (b[0] - b[1]) * f4;
d[i][2] = b[2] * f6 + b[3] * f2;
d[i][6] = b[3] * f6 - b[2] * f2;
b1[4] = b[4] + b[5];
b1[7] = b[7] + b[6];
b1[5] = b[4] - b[5];
b1[6] = b[7] - b[6];
d[i][1] = b1[4] * f7 + b1[7] * f1;
d[i][5] = b1[5] * f3 + b1[6] * f5;
d[i][7] = b1[7] * f7 - b1[4] * f1;
d[i][3] = b1[6] * f3 - b1[5] * f5;
}
/* Vertical transform */
for (i = 0; i < 8; i++)
{
for (j = 0; j < 4; j++)
{
j1 = 7 - j;
b1[j] = d[j][i] + d[j1][i];
b1[j1] = d[j][i] - d[j1][i];
}
b[0] = b1[0] + b1[3];
b[1] = b1[1] + b1[2];
b[2] = b1[1] - b1[2];
b[3] = b1[0] - b1[3];
b[4] = b1[4];
b[5] = (b1[6] - b1[5]) * f0;
b[6] = (b1[6] + b1[5]) * f0;
b[7] = b1[7];
d[0][i] = (b[0] + b[1]) * f4;
d[4][i] = (b[0] - b[1]) * f4;
d[2][i] = b[2] * f6 + b[3] * f2;
d[6][i] = b[3] * f6 - b[2] * f2;
b1[4] = b[4] + b[5];
b1[7] = b[7] + b[6];
b1[5] = b[4] - b[5];
b1[6] = b[7] - b[6];
d[1][i] = b1[4] * f7 + b1[7] * f1;
d[5][i] = b1[5] * f3 + b1[6] * f5;
d[7][i] = b1[7] * f7 - b1[4] * f1;
d[3][i] = b1[6] * f3 - b1[5] * f5;
}
for (i = 0; i < 8; i++)
{
for (j = 0; j < 8; j++)
{
*(coefs + j + i * 8) = (short) floor(d[i][j] +0.5);
}
}
return;
}
#endif
void vp8_short_fhaar2x2_c(short *input, short *output, int pitch) //pitch = 8
{
/* [1 1 ; 1 -1] orthogonal transform */
/* use position: 0,1, 4, 8 */
int i;
short *ip1 = input;
short *op1 = output;
for (i = 0; i < 16; i++)
{
op1[i] = 0;
}
op1[0]=(ip1[0] + ip1[1] + ip1[4] + ip1[8] + 1)>>1;
op1[1]=(ip1[0] - ip1[1] + ip1[4] - ip1[8])>>1;
op1[4]=(ip1[0] + ip1[1] - ip1[4] - ip1[8])>>1;
op1[8]=(ip1[0] - ip1[1] - ip1[4] + ip1[8])>>1;
}
void vp8_short_fdct4x4_c(short *input, short *output, int pitch)
{
int i;
int a1, b1, c1, d1;
short *ip = input;
short *op = output;
for (i = 0; i < 4; i++)
{
a1 = ((ip[0] + ip[3])<<5);
b1 = ((ip[1] + ip[2])<<5);
c1 = ((ip[1] - ip[2])<<5);
d1 = ((ip[0] - ip[3])<<5);
op[0] = a1 + b1;
op[2] = a1 - b1;
op[1] = (c1 * 2217 + d1 * 5352 + 14500)>>12;
op[3] = (d1 * 2217 - c1 * 5352 + 7500)>>12;
ip += pitch / 2;
op += 4;
}
ip = output;
op = output;
for (i = 0; i < 4; i++)
{
a1 = ip[0] + ip[12];
b1 = ip[4] + ip[8];
c1 = ip[4] - ip[8];
d1 = ip[0] - ip[12];
op[0] = ( a1 + b1 + 7)>>4;
op[8] = ( a1 - b1 + 7)>>4;
op[4] =((c1 * 2217 + d1 * 5352 + 12000)>>16) + (d1!=0);
op[12] = (d1 * 2217 - c1 * 5352 + 51000)>>16;
ip++;
op++;
}
}
void vp8_short_fdct8x4_c(short *input, short *output, int pitch)
{
vp8_short_fdct4x4_c(input, output, pitch);
vp8_short_fdct4x4_c(input + 4, output + 16, pitch);
}
void vp8_short_walsh4x4_c(short *input, short *output, int pitch)
{
int i;
int a1, b1, c1, d1;
short *ip = input;
short *op = output;
int pitch_short = pitch >>1;
for (i = 0; i < 4; i++)
{
a1 = ip[0 * pitch_short] + ip[3 * pitch_short];
b1 = ip[1 * pitch_short] + ip[2 * pitch_short];
c1 = ip[1 * pitch_short] - ip[2 * pitch_short];
d1 = ip[0 * pitch_short] - ip[3 * pitch_short];
op[0] = (a1 + b1 + 1)>>1;
op[4] = (c1 + d1)>>1;
op[8] = (a1 - b1)>>1;
op[12]= (d1 - c1)>>1;
ip++;
op++;
}
ip = output;
op = output;
for (i = 0; i < 4; i++)
{
a1 = ip[0] + ip[3];
b1 = ip[1] + ip[2];
c1 = ip[1] - ip[2];
d1 = ip[0] - ip[3];
op[0] = (a1 + b1 + 1)>>1;
op[1] = (c1 + d1)>>1;
op[2] = (a1 - b1)>>1;
op[3] = (d1 - c1)>>1;
ip += 4;
op += 4;
}
}