mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/*
|
|
* Lossless video DSP utils
|
|
*
|
|
* 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
|
|
*/
|
|
#include "avcodec.h"
|
|
#include "lossless_videodsp.h"
|
|
#include "libavcodec/mathops.h"
|
|
|
|
// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
|
|
#define pb_7f (~0UL / 255 * 0x7f)
|
|
#define pb_80 (~0UL / 255 * 0x80)
|
|
|
|
static void add_bytes_c(uint8_t *dst, uint8_t *src, intptr_t w)
|
|
{
|
|
long i;
|
|
|
|
for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
|
|
long a = *(long *) (src + i);
|
|
long b = *(long *) (dst + i);
|
|
*(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
|
|
}
|
|
for (; i < w; i++)
|
|
dst[i + 0] += src[i + 0];
|
|
}
|
|
|
|
static void add_median_pred_c(uint8_t *dst, const uint8_t *src1,
|
|
const uint8_t *diff, intptr_t w,
|
|
int *left, int *left_top)
|
|
{
|
|
int i;
|
|
uint8_t l, lt;
|
|
|
|
l = *left;
|
|
lt = *left_top;
|
|
|
|
for (i = 0; i < w; i++) {
|
|
l = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i];
|
|
lt = src1[i];
|
|
dst[i] = l;
|
|
}
|
|
|
|
*left = l;
|
|
*left_top = lt;
|
|
}
|
|
|
|
static int add_left_pred_c(uint8_t *dst, const uint8_t *src, intptr_t w,
|
|
int acc)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < w - 1; i++) {
|
|
acc += src[i];
|
|
dst[i] = acc;
|
|
i++;
|
|
acc += src[i];
|
|
dst[i] = acc;
|
|
}
|
|
|
|
for (; i < w; i++) {
|
|
acc += src[i];
|
|
dst[i] = acc;
|
|
}
|
|
|
|
return acc;
|
|
}
|
|
|
|
static int add_left_pred_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, int w, unsigned acc){
|
|
int i;
|
|
|
|
for(i=0; i<w-1; i++){
|
|
acc+= src[i];
|
|
dst[i]= acc &= mask;
|
|
i++;
|
|
acc+= src[i];
|
|
dst[i]= acc &= mask;
|
|
}
|
|
|
|
for(; i<w; i++){
|
|
acc+= src[i];
|
|
dst[i]= acc &= mask;
|
|
}
|
|
|
|
return acc;
|
|
}
|
|
|
|
|
|
void ff_llviddsp_init(LLVidDSPContext *c)
|
|
{
|
|
c->add_bytes = add_bytes_c;
|
|
c->add_median_pred = add_median_pred_c;
|
|
c->add_left_pred = add_left_pred_c;
|
|
|
|
c->add_left_pred_int16 = add_left_pred_int16_c;
|
|
|
|
if (ARCH_PPC)
|
|
ff_llviddsp_init_ppc(c);
|
|
if (ARCH_X86)
|
|
ff_llviddsp_init_x86(c);
|
|
}
|