📄 dsputil.c
字号:
/*
* DSP utils
* Copyright (c) 2000 Gerard Lantau.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#ifdef CONFIG_MMX
int mm_flags; /* multimedia extension flags */
#endif
//op_pixels_abs_func pix_abs16x16;
//op_pixels_abs_func pix_abs16x16_x2;
//op_pixels_abs_func pix_abs16x16_y2;
//op_pixels_abs_func pix_abs16x16_xy2;
static UINT8 cropTbl[256 + 2 * MAX_NEG_CROP];
UINT32 squareTbl[512];
void get_pixels(DCTELEM *block, const UINT8 *pixels, int line_size)
{
DCTELEM *p;
const UINT8 *pix;
int i;
/* read the pixels */
p = block;
pix = pixels;
for(i=0;i<8;i++) {
p[0] = pix[0];
p[1] = pix[1];
p[2] = pix[2];
p[3] = pix[3];
p[4] = pix[4];
p[5] = pix[5];
p[6] = pix[6];
p[7] = pix[7];
pix += line_size;
p += 8;
}
}
void put_pixels_clamped(const DCTELEM *block, UINT8 *pixels, int line_size)
{
const DCTELEM *p;
UINT8 *pix;
int i;
UINT8 *cm = cropTbl + MAX_NEG_CROP;
/* read the pixels */
p = block;
pix = pixels;
for(i=0;i<8;i++) {
pix[0] = cm[p[0]];
pix[1] = cm[p[1]];
pix[2] = cm[p[2]];
pix[3] = cm[p[3]];
pix[4] = cm[p[4]];
pix[5] = cm[p[5]];
pix[6] = cm[p[6]];
pix[7] = cm[p[7]];
pix += line_size;
p += 8;
}
}
void add_pixels_clamped(const DCTELEM *block, UINT8 *pixels, int line_size)
{
const DCTELEM *p;
UINT8 *pix;
int i;
UINT8 *cm = cropTbl + MAX_NEG_CROP;
/* read the pixels */
p = block;
pix = pixels;
for(i=0;i<8;i++) {
pix[0] = cm[pix[0] + p[0]];
pix[1] = cm[pix[1] + p[1]];
pix[2] = cm[pix[2] + p[2]];
pix[3] = cm[pix[3] + p[3]];
pix[4] = cm[pix[4] + p[4]];
pix[5] = cm[pix[5] + p[5]];
pix[6] = cm[pix[6] + p[6]];
pix[7] = cm[pix[7] + p[7]];
pix += line_size;
p += 8;
}
}
#define PIXOP(BTYPE, OPNAME, OP, INCR) \
\
static void OPNAME ## _pixels(BTYPE *block, const UINT8 *pixels, int line_size, int h) \
{ \
BTYPE *p; \
const UINT8 *pix; \
\
p = block; \
pix = pixels; \
do { \
OP(p[0], pix[0]); \
OP(p[1], pix[1]); \
OP(p[2], pix[2]); \
OP(p[3], pix[3]); \
OP(p[4], pix[4]); \
OP(p[5], pix[5]); \
OP(p[6], pix[6]); \
OP(p[7], pix[7]); \
pix += line_size; \
p += INCR; \
} while (--h);; \
} \
\
static void OPNAME ## _pixels_x2(BTYPE *block, const UINT8 *pixels, int line_size, int h) \
{ \
BTYPE *p; \
const UINT8 *pix; \
\
p = block; \
pix = pixels; \
do { \
OP(p[0], avg2(pix[0], pix[1])); \
OP(p[1], avg2(pix[1], pix[2])); \
OP(p[2], avg2(pix[2], pix[3])); \
OP(p[3], avg2(pix[3], pix[4])); \
OP(p[4], avg2(pix[4], pix[5])); \
OP(p[5], avg2(pix[5], pix[6])); \
OP(p[6], avg2(pix[6], pix[7])); \
OP(p[7], avg2(pix[7], pix[8])); \
pix += line_size; \
p += INCR; \
} while (--h); \
} \
\
static void OPNAME ## _pixels_y2(BTYPE *block, const UINT8 *pixels, int line_size, int h) \
{ \
BTYPE *p; \
const UINT8 *pix; \
const UINT8 *pix1; \
\
p = block; \
pix = pixels; \
pix1 = pixels + line_size; \
do { \
OP(p[0], avg2(pix[0], pix1[0])); \
OP(p[1], avg2(pix[1], pix1[1])); \
OP(p[2], avg2(pix[2], pix1[2])); \
OP(p[3], avg2(pix[3], pix1[3])); \
OP(p[4], avg2(pix[4], pix1[4])); \
OP(p[5], avg2(pix[5], pix1[5])); \
OP(p[6], avg2(pix[6], pix1[6])); \
OP(p[7], avg2(pix[7], pix1[7])); \
pix += line_size; \
pix1 += line_size; \
p += INCR; \
} while(--h); \
} \
\
static void OPNAME ## _pixels_xy2(BTYPE *block, const UINT8 *pixels, int line_size, int h) \
{ \
BTYPE *p; \
const UINT8 *pix; \
const UINT8 *pix1; \
\
p = block; \
pix = pixels; \
pix1 = pixels + line_size; \
do { \
OP(p[0], avg4(pix[0], pix[1], pix1[0], pix1[1])); \
OP(p[1], avg4(pix[1], pix[2], pix1[1], pix1[2])); \
OP(p[2], avg4(pix[2], pix[3], pix1[2], pix1[3])); \
OP(p[3], avg4(pix[3], pix[4], pix1[3], pix1[4])); \
OP(p[4], avg4(pix[4], pix[5], pix1[4], pix1[5])); \
OP(p[5], avg4(pix[5], pix[6], pix1[5], pix1[6])); \
OP(p[6], avg4(pix[6], pix[7], pix1[6], pix1[7])); \
OP(p[7], avg4(pix[7], pix[8], pix1[7], pix1[8])); \
pix += line_size; \
pix1 += line_size; \
p += INCR; \
} while(--h); \
} \
\
void (*OPNAME ## _pixels_tab[4])(BTYPE *block, const UINT8 *pixels, int line_size, int h) = { \
OPNAME ## _pixels, \
OPNAME ## _pixels_x2, \
OPNAME ## _pixels_y2, \
OPNAME ## _pixels_xy2, \
};
/* rounding primitives */
#define avg2(a,b) ((a+b+1)>>1)
#define avg4(a,b,c,d) ((a+b+c+d+2)>>2)
#define op_put(a, b) a = b
#define op_avg(a, b) a = avg2(a, b)
#define op_sub(a, b) a -= b
PIXOP(UINT8, put, op_put, line_size)
PIXOP(UINT8, avg, op_avg, line_size)
PIXOP(DCTELEM, sub, op_sub, 8)
/* not rounding primitives */
#undef avg2
#undef avg4
#define avg2(a,b) ((a+b)>>1)
#define avg4(a,b,c,d) ((a+b+c+d+1)>>2)
PIXOP(UINT8, put_no_rnd, op_put, line_size)
PIXOP(UINT8, avg_no_rnd, op_avg, line_size)
/* motion estimation */
#undef avg2
#undef avg4
#define avg2(a,b) ((a+b+1)>>1)
#define avg4(a,b,c,d) ((a+b+c+d+2)>>2)
void dsputil_init(void)
{
int i;
for(i=0;i<256;i++) cropTbl[i + MAX_NEG_CROP] = i;
for(i=0;i<MAX_NEG_CROP;i++) {
cropTbl[i] = 0;
cropTbl[i + MAX_NEG_CROP + 256] = 255;
}
for(i=0;i<512;i++) {
squareTbl[i] = (i - 256) * (i - 256);
}
// pix_abs16x16 = pix_abs16x16_c;
// pix_abs16x16_x2 = pix_abs16x16_x2_c;
// pix_abs16x16_y2 = pix_abs16x16_y2_c;
// pix_abs16x16_xy2 = pix_abs16x16_xy2_c;
//av_fdct = jpeg_fdct_ifast;
#ifdef CONFIG_MMX
mm_flags = mm_support();
#if 0
#endif
// if (mm_flags & MM_MMX) {
// pix_abs16x16 = pix_abs16x16_mmx;
// pix_abs16x16_x2 = pix_abs16x16_x2_mmx;
// pix_abs16x16_y2 = pix_abs16x16_y2_mmx;
// pix_abs16x16_xy2 = pix_abs16x16_xy2_mmx;
// av_fdct = fdct_mmx;
// }
// if (mm_flags & MM_MMXEXT) {
pix_abs16x16 = pix_abs16x16_sse;
// }
#endif
}
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -