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/*
* Copyright (C) 2004 the ffmpeg project
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file vp3dsp.c
* Standard C DSP-oriented functions cribbed from the original VP3
* source code.
*/
#include "common.h"
#include "avcodec.h"
#include "dsputil.h"
#define IdctAdjustBeforeShift 8
#define xC1S7 64277
#define xC2S6 60547
#define xC3S5 54491
#define xC4S4 46341
#define xC5S3 36410
#define xC6S2 25080
#define xC7S1 12785
#define M(a,b) (((a) * (b))>>16)
static always_inline void idct(uint8_t *dst, int stride, int16_t *input, int type)
{
int16_t *ip = input;
uint8_t *cm = cropTbl + MAX_NEG_CROP;
int A_, B_, C_, D_, _Ad, _Bd, _Cd, _Dd, E_, F_, G_, H_;
int _Ed, _Gd, _Add, _Bdd, _Fd, _Hd;
int i;
/* Inverse DCT on the rows now */
for (i = 0; i < 8; i++) {
/* Check for non-zero values */
if ( ip[0] | ip[1] | ip[2] | ip[3] | ip[4] | ip[5] | ip[6] | ip[7] ) {
A_ = M(xC1S7, ip[1]) + M(xC7S1, ip[7]);
B_ = M(xC7S1, ip[1]) - M(xC1S7, ip[7]);
C_ = M(xC3S5, ip[3]) + M(xC5S3, ip[5]);
D_ = M(xC3S5, ip[5]) - M(xC5S3, ip[3]);
_Ad = M(xC4S4, (A_ - C_));
_Bd = M(xC4S4, (B_ - D_));
_Cd = A_ + C_;
_Dd = B_ + D_;
E_ = M(xC4S4, (ip[0] + ip[4]));
F_ = M(xC4S4, (ip[0] - ip[4]));
G_ = M(xC2S6, ip[2]) + M(xC6S2, ip[6]);
H_ = M(xC6S2, ip[2]) - M(xC2S6, ip[6]);
_Ed = E_ - G_;
_Gd = E_ + G_;
_Add = F_ + _Ad;
_Bdd = _Bd - H_;
_Fd = F_ - _Ad;
_Hd = _Bd + H_;
/* Final sequence of operations over-write original inputs. */
ip[0] = _Gd + _Cd ;
ip[7] = _Gd - _Cd ;
ip[1] = _Add + _Hd;
ip[2] = _Add - _Hd;
ip[3] = _Ed + _Dd ;
ip[4] = _Ed - _Dd ;
ip[5] = _Fd + _Bdd;
ip[6] = _Fd - _Bdd;
}
ip += 8; /* next row */
}
ip = input;
for ( i = 0; i < 8; i++) {
/* Check for non-zero values (bitwise or faster than ||) */
if ( ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |
ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8] ) {
A_ = M(xC1S7, ip[1*8]) + M(xC7S1, ip[7*8]);
B_ = M(xC7S1, ip[1*8]) - M(xC1S7, ip[7*8]);
C_ = M(xC3S5, ip[3*8]) + M(xC5S3, ip[5*8]);
D_ = M(xC3S5, ip[5*8]) - M(xC5S3, ip[3*8]);
_Ad = M(xC4S4, (A_ - C_));
_Bd = M(xC4S4, (B_ - D_));
_Cd = A_ + C_;
_Dd = B_ + D_;
E_ = M(xC4S4, (ip[0*8] + ip[4*8]));
F_ = M(xC4S4, (ip[0*8] - ip[4*8]));
G_ = M(xC2S6, ip[2*8]) + M(xC6S2, ip[6*8]);
H_ = M(xC6S2, ip[2*8]) - M(xC2S6, ip[6*8]);
_Ed = E_ - G_;
_Gd = E_ + G_;
_Add = F_ + _Ad;
_Bdd = _Bd - H_;
_Fd = F_ - _Ad;
_Hd = _Bd + H_;
if(type==1){ //HACK
_Gd += 16*128;
_Add+= 16*128;
_Ed += 16*128;
_Fd += 16*128;
}
_Gd += IdctAdjustBeforeShift;
_Add += IdctAdjustBeforeShift;
_Ed += IdctAdjustBeforeShift;
_Fd += IdctAdjustBeforeShift;
/* Final sequence of operations over-write original inputs. */
if(type==0){
ip[0*8] = (_Gd + _Cd ) >> 4;
ip[7*8] = (_Gd - _Cd ) >> 4;
ip[1*8] = (_Add + _Hd ) >> 4;
ip[2*8] = (_Add - _Hd ) >> 4;
ip[3*8] = (_Ed + _Dd ) >> 4;
ip[4*8] = (_Ed - _Dd ) >> 4;
ip[5*8] = (_Fd + _Bdd ) >> 4;
ip[6*8] = (_Fd - _Bdd ) >> 4;
}else if(type==1){
dst[0*stride] = cm[(_Gd + _Cd ) >> 4];
dst[7*stride] = cm[(_Gd - _Cd ) >> 4];
dst[1*stride] = cm[(_Add + _Hd ) >> 4];
dst[2*stride] = cm[(_Add - _Hd ) >> 4];
dst[3*stride] = cm[(_Ed + _Dd ) >> 4];
dst[4*stride] = cm[(_Ed - _Dd ) >> 4];
dst[5*stride] = cm[(_Fd + _Bdd ) >> 4];
dst[6*stride] = cm[(_Fd - _Bdd ) >> 4];
}else{
dst[0*stride] = cm[dst[0*stride] + ((_Gd + _Cd ) >> 4)];
dst[7*stride] = cm[dst[7*stride] + ((_Gd - _Cd ) >> 4)];
dst[1*stride] = cm[dst[1*stride] + ((_Add + _Hd ) >> 4)];
dst[2*stride] = cm[dst[2*stride] + ((_Add - _Hd ) >> 4)];
dst[3*stride] = cm[dst[3*stride] + ((_Ed + _Dd ) >> 4)];
dst[4*stride] = cm[dst[4*stride] + ((_Ed - _Dd ) >> 4)];
dst[5*stride] = cm[dst[5*stride] + ((_Fd + _Bdd ) >> 4)];
dst[6*stride] = cm[dst[6*stride] + ((_Fd - _Bdd ) >> 4)];
}
} else {
if(type==0){
ip[0*8] =
ip[1*8] =
ip[2*8] =
ip[3*8] =
ip[4*8] =
ip[5*8] =
ip[6*8] =
ip[7*8] = ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
}else if(type==1){
dst[0*stride]=
dst[1*stride]=
dst[2*stride]=
dst[3*stride]=
dst[4*stride]=
dst[5*stride]=
dst[6*stride]=
dst[7*stride]= 128 + ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
}else{
if(ip[0*8]){
int v= ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
dst[0*stride] = cm[dst[0*stride] + v];
dst[1*stride] = cm[dst[1*stride] + v];
dst[2*stride] = cm[dst[2*stride] + v];
dst[3*stride] = cm[dst[3*stride] + v];
dst[4*stride] = cm[dst[4*stride] + v];
dst[5*stride] = cm[dst[5*stride] + v];
dst[6*stride] = cm[dst[6*stride] + v];
dst[7*stride] = cm[dst[7*stride] + v];
}
}
}
ip++; /* next column */
dst++;
}
}
void ff_vp3_idct_c(DCTELEM *block/* align 16*/){
idct(NULL, 0, block, 0);
}
void ff_vp3_idct_put_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/){
idct(dest, line_size, block, 1);
}
void ff_vp3_idct_add_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/){
idct(dest, line_size, block, 2);
}
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