mirror of
https://github.com/FFmpeg/FFmpeg.git
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7be79c76d3
This avoids potential issues with the high 32bits being random in x86-64 asm Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "mathops.h"
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#include "huffyuvdsp.h"
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// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
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#define pb_7f (~0UL / 255 * 0x7f)
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#define pb_80 (~0UL / 255 * 0x80)
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static void add_bytes_c(uint8_t *dst, uint8_t *src, intptr_t w)
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{
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long i;
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for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
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long a = *(long *) (src + i);
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long b = *(long *) (dst + i);
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*(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
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}
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for (; i < w; i++)
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dst[i + 0] += src[i + 0];
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}
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static void add_hfyu_median_pred_c(uint8_t *dst, const uint8_t *src1,
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const uint8_t *diff, intptr_t w,
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int *left, int *left_top)
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{
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int i;
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uint8_t l, lt;
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l = *left;
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lt = *left_top;
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for (i = 0; i < w; i++) {
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l = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i];
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lt = src1[i];
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dst[i] = l;
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}
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*left = l;
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*left_top = lt;
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}
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static int add_hfyu_left_pred_c(uint8_t *dst, const uint8_t *src, intptr_t w,
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int acc)
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{
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int i;
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for (i = 0; i < w - 1; i++) {
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acc += src[i];
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dst[i] = acc;
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i++;
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acc += src[i];
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dst[i] = acc;
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}
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for (; i < w; i++) {
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acc += src[i];
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dst[i] = acc;
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}
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return acc;
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}
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static void add_hfyu_left_pred_bgr32_c(uint8_t *dst, const uint8_t *src,
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intptr_t w, uint8_t *left)
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{
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int i;
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uint8_t r = left[R], g = left[G], b = left[B], a = left[A];
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for (i = 0; i < w; i++) {
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b += src[4 * i + B];
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g += src[4 * i + G];
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r += src[4 * i + R];
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a += src[4 * i + A];
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dst[4 * i + B] = b;
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dst[4 * i + G] = g;
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dst[4 * i + R] = r;
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dst[4 * i + A] = a;
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}
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left[B] = b;
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left[G] = g;
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left[R] = r;
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left[A] = a;
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}
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av_cold void ff_huffyuvdsp_init(HuffYUVDSPContext *c)
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{
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c->add_bytes = add_bytes_c;
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c->add_hfyu_median_pred = add_hfyu_median_pred_c;
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c->add_hfyu_left_pred = add_hfyu_left_pred_c;
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c->add_hfyu_left_pred_bgr32 = add_hfyu_left_pred_bgr32_c;
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if (ARCH_X86)
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ff_huffyuvdsp_init_x86(c);
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}
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