mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/*
|
|
* 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 "config.h"
|
|
#include "libavutil/attributes.h"
|
|
#include "lossless_videoencdsp.h"
|
|
#include "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 diff_bytes_c(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, intptr_t w)
|
|
{
|
|
long i;
|
|
|
|
#if !HAVE_FAST_UNALIGNED
|
|
if (((long)src1 | (long)src2) & (sizeof(long) - 1)) {
|
|
for (i = 0; i + 7 < w; i += 8) {
|
|
dst[i + 0] = src1[i + 0] - src2[i + 0];
|
|
dst[i + 1] = src1[i + 1] - src2[i + 1];
|
|
dst[i + 2] = src1[i + 2] - src2[i + 2];
|
|
dst[i + 3] = src1[i + 3] - src2[i + 3];
|
|
dst[i + 4] = src1[i + 4] - src2[i + 4];
|
|
dst[i + 5] = src1[i + 5] - src2[i + 5];
|
|
dst[i + 6] = src1[i + 6] - src2[i + 6];
|
|
dst[i + 7] = src1[i + 7] - src2[i + 7];
|
|
}
|
|
} else
|
|
#endif
|
|
for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
|
|
long a = *(long *) (src1 + i);
|
|
long b = *(long *) (src2 + i);
|
|
*(long *) (dst + i) = ((a | pb_80) - (b & pb_7f)) ^
|
|
((a ^ b ^ pb_80) & pb_80);
|
|
}
|
|
for (; i < w; i++)
|
|
dst[i + 0] = src1[i + 0] - src2[i + 0];
|
|
}
|
|
|
|
static void sub_median_pred_c(uint8_t *dst, const uint8_t *src1,
|
|
const uint8_t *src2, 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++) {
|
|
const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF);
|
|
lt = src1[i];
|
|
l = src2[i];
|
|
dst[i] = l - pred;
|
|
}
|
|
|
|
*left = l;
|
|
*left_top = lt;
|
|
}
|
|
|
|
static void sub_left_predict_c(uint8_t *dst, const uint8_t *src,
|
|
ptrdiff_t stride, ptrdiff_t width, int height)
|
|
{
|
|
int i, j;
|
|
uint8_t prev = 0x80; /* Set the initial value */
|
|
for (j = 0; j < height; j++) {
|
|
for (i = 0; i < width; i++) {
|
|
*dst++ = src[i] - prev;
|
|
prev = src[i];
|
|
}
|
|
src += stride;
|
|
}
|
|
}
|
|
|
|
av_cold void ff_llvidencdsp_init(LLVidEncDSPContext *c)
|
|
{
|
|
c->diff_bytes = diff_bytes_c;
|
|
c->sub_median_pred = sub_median_pred_c;
|
|
c->sub_left_predict = sub_left_predict_c;
|
|
|
|
#if ARCH_X86
|
|
ff_llvidencdsp_init_x86(c);
|
|
#endif
|
|
}
|