92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
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/*
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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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// 0x00010001 or 0x0001000100010001 or whatever, depending on the cpu's native arithmetic size
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#define pw_1 (ULONG_MAX / UINT16_MAX)
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static void add_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, int w){
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long i;
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unsigned long pw_lsb = (mask >> 1) * pw_1;
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unsigned long pw_msb = pw_lsb + pw_1;
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for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) {
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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&pw_lsb) + (b&pw_lsb)) ^ ((a^b)&pw_msb);
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}
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for(; i<w; i++)
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dst[i] = (dst[i] + src[i]) & mask;
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}
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static void add_hfyu_median_pred_int16_c(uint16_t *dst, const uint16_t *src, const uint16_t *diff, unsigned mask, int w, int *left, int *left_top){
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int i;
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uint16_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, src[i], (l + src[i] - lt) & mask) + diff[i]) & mask;
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lt = src[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 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, enum AVPixelFormat pix_fmt)
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{
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c->add_int16 = add_int16_c;
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c->add_hfyu_median_pred_int16 = add_hfyu_median_pred_int16_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, pix_fmt);
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}
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