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FFmpeg/libavcodec/vc1dsp.c
Kostya Shishkov 61f5b14a8e Correct rounding values in overlap filtering 
Originally committed as revision 7171 to svn://svn.ffmpeg.org/ffmpeg/trunk
2006-11-26 04:57:31 +00:00

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/*
* VC-1 and WMV3 decoder - DSP functions
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
* @file vc1dsp.c
* VC-1 and WMV3 decoder
*
*/
#include "dsputil.h"
/** Apply overlap transform to horizontal edge
*/
static void vc1_v_overlap_c(uint8_t* src, int stride)
{
int i;
int a, b, c, d;
int d1, d2;
int rnd = 1;
for(i = 0; i < 8; i++) {
a = src[-2*stride];
b = src[-stride];
c = src[0];
d = src[stride];
d1 = (a - d + 3 + rnd) >> 3;
d2 = (a - d + b - c + 4 - rnd) >> 3;
src[-2*stride] = a - d1;
src[-stride] = b - d2;
src[0] = c + d2;
src[stride] = d + d1;
src++;
rnd = !rnd;
}
}
/** Apply overlap transform to vertical edge
*/
static void vc1_h_overlap_c(uint8_t* src, int stride)
{
int i;
int a, b, c, d;
int d1, d2;
int rnd = 1;
for(i = 0; i < 8; i++) {
a = src[-2];
b = src[-1];
c = src[0];
d = src[1];
d1 = (a - d + 3 + rnd) >> 3;
d2 = (a - d + b - c + 4 - rnd) >> 3;
src[-2] = a - d1;
src[-1] = b - d2;
src[0] = c + d2;
src[1] = d + d1;
src += stride;
rnd = !rnd;
}
}
/** Do inverse transform on 8x8 block
*/
static void vc1_inv_trans_8x8_c(DCTELEM block[64])
{
int i;
register int t1,t2,t3,t4,t5,t6,t7,t8;
DCTELEM *src, *dst;
src = block;
dst = block;
for(i = 0; i < 8; i++){
t1 = 12 * (src[0] + src[4]);
t2 = 12 * (src[0] - src[4]);
t3 = 16 * src[2] + 6 * src[6];
t4 = 6 * src[2] - 16 * src[6];
t5 = t1 + t3;
t6 = t2 + t4;
t7 = t2 - t4;
t8 = t1 - t3;
t1 = 16 * src[1] + 15 * src[3] + 9 * src[5] + 4 * src[7];
t2 = 15 * src[1] - 4 * src[3] - 16 * src[5] - 9 * src[7];
t3 = 9 * src[1] - 16 * src[3] + 4 * src[5] + 15 * src[7];
t4 = 4 * src[1] - 9 * src[3] + 15 * src[5] - 16 * src[7];
dst[0] = (t5 + t1 + 4) >> 3;
dst[1] = (t6 + t2 + 4) >> 3;
dst[2] = (t7 + t3 + 4) >> 3;
dst[3] = (t8 + t4 + 4) >> 3;
dst[4] = (t8 - t4 + 4) >> 3;
dst[5] = (t7 - t3 + 4) >> 3;
dst[6] = (t6 - t2 + 4) >> 3;
dst[7] = (t5 - t1 + 4) >> 3;
src += 8;
dst += 8;
}
src = block;
dst = block;
for(i = 0; i < 8; i++){
t1 = 12 * (src[ 0] + src[32]);
t2 = 12 * (src[ 0] - src[32]);
t3 = 16 * src[16] + 6 * src[48];
t4 = 6 * src[16] - 16 * src[48];
t5 = t1 + t3;
t6 = t2 + t4;
t7 = t2 - t4;
t8 = t1 - t3;
t1 = 16 * src[ 8] + 15 * src[24] + 9 * src[40] + 4 * src[56];
t2 = 15 * src[ 8] - 4 * src[24] - 16 * src[40] - 9 * src[56];
t3 = 9 * src[ 8] - 16 * src[24] + 4 * src[40] + 15 * src[56];
t4 = 4 * src[ 8] - 9 * src[24] + 15 * src[40] - 16 * src[56];
dst[ 0] = (t5 + t1 + 64) >> 7;
dst[ 8] = (t6 + t2 + 64) >> 7;
dst[16] = (t7 + t3 + 64) >> 7;
dst[24] = (t8 + t4 + 64) >> 7;
dst[32] = (t8 - t4 + 64 + 1) >> 7;
dst[40] = (t7 - t3 + 64 + 1) >> 7;
dst[48] = (t6 - t2 + 64 + 1) >> 7;
dst[56] = (t5 - t1 + 64 + 1) >> 7;
src++;
dst++;
}
}
/** Do inverse transform on 8x4 part of block
*/
static void vc1_inv_trans_8x4_c(DCTELEM block[64], int n)
{
int i;
register int t1,t2,t3,t4,t5,t6,t7,t8;
DCTELEM *src, *dst;
int off;
off = n * 32;
src = block + off;
dst = block + off;
for(i = 0; i < 4; i++){
t1 = 12 * (src[0] + src[4]);
t2 = 12 * (src[0] - src[4]);
t3 = 16 * src[2] + 6 * src[6];
t4 = 6 * src[2] - 16 * src[6];
t5 = t1 + t3;
t6 = t2 + t4;
t7 = t2 - t4;
t8 = t1 - t3;
t1 = 16 * src[1] + 15 * src[3] + 9 * src[5] + 4 * src[7];
t2 = 15 * src[1] - 4 * src[3] - 16 * src[5] - 9 * src[7];
t3 = 9 * src[1] - 16 * src[3] + 4 * src[5] + 15 * src[7];
t4 = 4 * src[1] - 9 * src[3] + 15 * src[5] - 16 * src[7];
dst[0] = (t5 + t1 + 4) >> 3;
dst[1] = (t6 + t2 + 4) >> 3;
dst[2] = (t7 + t3 + 4) >> 3;
dst[3] = (t8 + t4 + 4) >> 3;
dst[4] = (t8 - t4 + 4) >> 3;
dst[5] = (t7 - t3 + 4) >> 3;
dst[6] = (t6 - t2 + 4) >> 3;
dst[7] = (t5 - t1 + 4) >> 3;
src += 8;
dst += 8;
}
src = block + off;
dst = block + off;
for(i = 0; i < 8; i++){
t1 = 17 * (src[ 0] + src[16]);
t2 = 17 * (src[ 0] - src[16]);
t3 = 22 * src[ 8];
t4 = 22 * src[24];
t5 = 10 * src[ 8];
t6 = 10 * src[24];
dst[ 0] = (t1 + t3 + t6 + 64) >> 7;
dst[ 8] = (t2 - t4 + t5 + 64) >> 7;
dst[16] = (t2 + t4 - t5 + 64) >> 7;
dst[24] = (t1 - t3 - t6 + 64) >> 7;
src ++;
dst ++;
}
}
/** Do inverse transform on 4x8 parts of block
*/
static void vc1_inv_trans_4x8_c(DCTELEM block[64], int n)
{
int i;
register int t1,t2,t3,t4,t5,t6,t7,t8;
DCTELEM *src, *dst;
int off;
off = n * 4;
src = block + off;
dst = block + off;
for(i = 0; i < 8; i++){
t1 = 17 * (src[0] + src[2]);
t2 = 17 * (src[0] - src[2]);
t3 = 22 * src[1];
t4 = 22 * src[3];
t5 = 10 * src[1];
t6 = 10 * src[3];
dst[0] = (t1 + t3 + t6 + 4) >> 3;
dst[1] = (t2 - t4 + t5 + 4) >> 3;
dst[2] = (t2 + t4 - t5 + 4) >> 3;
dst[3] = (t1 - t3 - t6 + 4) >> 3;
src += 8;
dst += 8;
}
src = block + off;
dst = block + off;
for(i = 0; i < 4; i++){
t1 = 12 * (src[ 0] + src[32]);
t2 = 12 * (src[ 0] - src[32]);
t3 = 16 * src[16] + 6 * src[48];
t4 = 6 * src[16] - 16 * src[48];
t5 = t1 + t3;
t6 = t2 + t4;
t7 = t2 - t4;
t8 = t1 - t3;
t1 = 16 * src[ 8] + 15 * src[24] + 9 * src[40] + 4 * src[56];
t2 = 15 * src[ 8] - 4 * src[24] - 16 * src[40] - 9 * src[56];
t3 = 9 * src[ 8] - 16 * src[24] + 4 * src[40] + 15 * src[56];
t4 = 4 * src[ 8] - 9 * src[24] + 15 * src[40] - 16 * src[56];
dst[ 0] = (t5 + t1 + 64) >> 7;
dst[ 8] = (t6 + t2 + 64) >> 7;
dst[16] = (t7 + t3 + 64) >> 7;
dst[24] = (t8 + t4 + 64) >> 7;
dst[32] = (t8 - t4 + 64 + 1) >> 7;
dst[40] = (t7 - t3 + 64 + 1) >> 7;
dst[48] = (t6 - t2 + 64 + 1) >> 7;
dst[56] = (t5 - t1 + 64 + 1) >> 7;
src++;
dst++;
}
}
/** Do inverse transform on 4x4 part of block
*/
static void vc1_inv_trans_4x4_c(DCTELEM block[64], int n)
{
int i;
register int t1,t2,t3,t4,t5,t6;
DCTELEM *src, *dst;
int off;
off = (n&1) * 4 + (n&2) * 16;
src = block + off;
dst = block + off;
for(i = 0; i < 4; i++){
t1 = 17 * (src[0] + src[2]);
t2 = 17 * (src[0] - src[2]);
t3 = 22 * src[1];
t4 = 22 * src[3];
t5 = 10 * src[1];
t6 = 10 * src[3];
dst[0] = (t1 + t3 + t6 + 4) >> 3;
dst[1] = (t2 - t4 + t5 + 4) >> 3;
dst[2] = (t2 + t4 - t5 + 4) >> 3;
dst[3] = (t1 - t3 - t6 + 4) >> 3;
src += 8;
dst += 8;
}
src = block + off;
dst = block + off;
for(i = 0; i < 4; i++){
t1 = 17 * (src[ 0] + src[16]);
t2 = 17 * (src[ 0] - src[16]);
t3 = 22 * src[ 8];
t4 = 22 * src[24];
t5 = 10 * src[ 8];
t6 = 10 * src[24];
dst[ 0] = (t1 + t3 + t6 + 64) >> 7;
dst[ 8] = (t2 - t4 + t5 + 64) >> 7;
dst[16] = (t2 + t4 - t5 + 64) >> 7;
dst[24] = (t1 - t3 - t6 + 64) >> 7;
src ++;
dst ++;
}
}
/* motion compensation functions */
/** Filter used to interpolate fractional pel values
*/
static always_inline int vc1_mspel_filter(const uint8_t *src, int stride, int mode, int r)
{
switch(mode){
case 0: //no shift
return src[0];
case 1: // 1/4 shift
return (-4*src[-stride] + 53*src[0] + 18*src[stride] - 3*src[stride*2] + 32 - r) >> 6;
case 2: // 1/2 shift
return (-src[-stride] + 9*src[0] + 9*src[stride] - src[stride*2] + 8 - r) >> 4;
case 3: // 3/4 shift
return (-3*src[-stride] + 18*src[0] + 53*src[stride] - 4*src[stride*2] + 32 - r) >> 6;
}
return 0; //should not occur
}
/** Function used to do motion compensation with bicubic interpolation
*/
static void vc1_mspel_mc(uint8_t *dst, const uint8_t *src, int stride, int mode, int rnd)
{
int i, j;
uint8_t tmp[8*11], *tptr;
int m, r;
m = (mode & 3);
r = rnd;
src -= stride;
tptr = tmp;
for(j = 0; j < 11; j++) {
for(i = 0; i < 8; i++)
tptr[i] = clip_uint8(vc1_mspel_filter(src + i, 1, m, r));
src += stride;
tptr += 8;
}
r = 1 - rnd;
m = (mode >> 2) & 3;
tptr = tmp + 8;
for(j = 0; j < 8; j++) {
for(i = 0; i < 8; i++)
dst[i] = clip_uint8(vc1_mspel_filter(tptr + i, 8, m, r));
dst += stride;
tptr += 8;
}
}
/* pixel functions - really are entry points to vc1_mspel_mc */
/* this one is defined in dsputil.c */
void ff_put_vc1_mspel_mc00_c(uint8_t *dst, const uint8_t *src, int stride, int rnd);
static void ff_put_vc1_mspel_mc10_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x1, rnd);
}
static void ff_put_vc1_mspel_mc20_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x2, rnd);
}
static void ff_put_vc1_mspel_mc30_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x3, rnd);
}
static void ff_put_vc1_mspel_mc01_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x4, rnd);
}
static void ff_put_vc1_mspel_mc11_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x5, rnd);
}
static void ff_put_vc1_mspel_mc21_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x6, rnd);
}
static void ff_put_vc1_mspel_mc31_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x7, rnd);
}
static void ff_put_vc1_mspel_mc02_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x8, rnd);
}
static void ff_put_vc1_mspel_mc12_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0x9, rnd);
}
static void ff_put_vc1_mspel_mc22_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0xA, rnd);
}
static void ff_put_vc1_mspel_mc32_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0xB, rnd);
}
static void ff_put_vc1_mspel_mc03_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0xC, rnd);
}
static void ff_put_vc1_mspel_mc13_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0xD, rnd);
}
static void ff_put_vc1_mspel_mc23_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0xE, rnd);
}
static void ff_put_vc1_mspel_mc33_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {
vc1_mspel_mc(dst, src, stride, 0xF, rnd);
}
void ff_vc1dsp_init(DSPContext* dsp, AVCodecContext *avctx) {
dsp->vc1_inv_trans_8x8 = vc1_inv_trans_8x8_c;
dsp->vc1_inv_trans_4x8 = vc1_inv_trans_4x8_c;
dsp->vc1_inv_trans_8x4 = vc1_inv_trans_8x4_c;
dsp->vc1_inv_trans_4x4 = vc1_inv_trans_4x4_c;
dsp->vc1_h_overlap = vc1_h_overlap_c;
dsp->vc1_v_overlap = vc1_v_overlap_c;
dsp->put_vc1_mspel_pixels_tab[ 0] = ff_put_vc1_mspel_mc00_c;
dsp->put_vc1_mspel_pixels_tab[ 1] = ff_put_vc1_mspel_mc10_c;
dsp->put_vc1_mspel_pixels_tab[ 2] = ff_put_vc1_mspel_mc20_c;
dsp->put_vc1_mspel_pixels_tab[ 3] = ff_put_vc1_mspel_mc30_c;
dsp->put_vc1_mspel_pixels_tab[ 4] = ff_put_vc1_mspel_mc01_c;
dsp->put_vc1_mspel_pixels_tab[ 5] = ff_put_vc1_mspel_mc11_c;
dsp->put_vc1_mspel_pixels_tab[ 6] = ff_put_vc1_mspel_mc21_c;
dsp->put_vc1_mspel_pixels_tab[ 7] = ff_put_vc1_mspel_mc31_c;
dsp->put_vc1_mspel_pixels_tab[ 8] = ff_put_vc1_mspel_mc02_c;
dsp->put_vc1_mspel_pixels_tab[ 9] = ff_put_vc1_mspel_mc12_c;
dsp->put_vc1_mspel_pixels_tab[10] = ff_put_vc1_mspel_mc22_c;
dsp->put_vc1_mspel_pixels_tab[11] = ff_put_vc1_mspel_mc32_c;
dsp->put_vc1_mspel_pixels_tab[12] = ff_put_vc1_mspel_mc03_c;
dsp->put_vc1_mspel_pixels_tab[13] = ff_put_vc1_mspel_mc13_c;
dsp->put_vc1_mspel_pixels_tab[14] = ff_put_vc1_mspel_mc23_c;
dsp->put_vc1_mspel_pixels_tab[15] = ff_put_vc1_mspel_mc33_c;
}
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