/* * 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 "common.h"#include "pixelutils.h"#include "internal.h" #if CONFIG_PIXELUTILS #include "x86/pixelutils.h" static av_always_inline int sad_wxh(const uint8_t *src1, ptrdiff_t stride1,                                    const uint8_t *src2, ptrdiff_t stride2,                                    int w, int h){    int x, y, sum = 0;     for (y = 0; y < h; y++) {        for (x = 0; x < w; x++)            sum += abs(src1[x] - src2[x]);        src1 += stride1;        src2 += stride2;    }    return sum;} #define DECLARE_BLOCK_FUNCTIONS(size)                                               \static int block_sad_##size##x##size##_c(const uint8_t *src1, ptrdiff_t stride1,    \                                         const uint8_t *src2, ptrdiff_t stride2)    \{                                                                                   \    return sad_wxh(src1, stride1, src2, stride2, size, size);                       \} DECLARE_BLOCK_FUNCTIONS(2)DECLARE_BLOCK_FUNCTIONS(4)DECLARE_BLOCK_FUNCTIONS(8)DECLARE_BLOCK_FUNCTIONS(16) static const av_pixelutils_sad_fn sad_c[] = {    block_sad_2x2_c,    block_sad_4x4_c,    block_sad_8x8_c,    block_sad_16x16_c,}; #endif /* CONFIG_PIXELUTILS */ av_pixelutils_sad_fn av_pixelutils_get_sad_fn(int w_bits, int h_bits, int aligned, void *log_ctx){#if !CONFIG_PIXELUTILS    av_log(log_ctx, AV_LOG_ERROR, "pixelutils support is required "           "but libavutil is not compiled with it\n");    return NULL;#else    av_pixelutils_sad_fn sad[FF_ARRAY_ELEMS(sad_c)];     memcpy(sad, sad_c, sizeof(sad));     if (w_bits < 1 || w_bits > FF_ARRAY_ELEMS(sad) ||        h_bits < 1 || h_bits > FF_ARRAY_ELEMS(sad))        return NULL;    if (w_bits != h_bits) // only squared sad for now        return NULL; #if ARCH_X86    ff_pixelutils_sad_init_x86(sad, aligned);#endif     return sad[w_bits - 1];#endif}