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pixelutils_init.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 
21 #include "pixelutils.h"
22 #include "cpu.h"
23 
24 int ff_pixelutils_sad_8x8_mmx(const uint8_t *src1, ptrdiff_t stride1,
25  const uint8_t *src2, ptrdiff_t stride2);
26 int ff_pixelutils_sad_8x8_mmxext(const uint8_t *src1, ptrdiff_t stride1,
27  const uint8_t *src2, ptrdiff_t stride2);
28 
29 int ff_pixelutils_sad_16x16_mmxext(const uint8_t *src1, ptrdiff_t stride1,
30  const uint8_t *src2, ptrdiff_t stride2);
31 int ff_pixelutils_sad_16x16_sse2(const uint8_t *src1, ptrdiff_t stride1,
32  const uint8_t *src2, ptrdiff_t stride2);
33 int ff_pixelutils_sad_a_16x16_sse2(const uint8_t *src1, ptrdiff_t stride1,
34  const uint8_t *src2, ptrdiff_t stride2);
35 int ff_pixelutils_sad_u_16x16_sse2(const uint8_t *src1, ptrdiff_t stride1,
36  const uint8_t *src2, ptrdiff_t stride2);
37 
39 {
40  int cpu_flags = av_get_cpu_flags();
41 
42  if (EXTERNAL_MMX(cpu_flags)) {
44  }
45 
46  // The best way to use SSE2 would be to do 2 SADs in parallel,
47  // but we'd have to modify the pixelutils API to return SIMD functions.
48 
49  // It's probably not faster to shuffle data around
50  // to get two lines of 8 pixels into a single 16byte register,
51  // so just use the MMX 8x8 version even when SSE2 is available.
52  if (EXTERNAL_MMXEXT(cpu_flags)) {
55  }
56 
57  if (EXTERNAL_SSE2(cpu_flags)) {
58  switch (aligned) {
59  case 0: sad[3] = ff_pixelutils_sad_16x16_sse2; break; // src1 unaligned, src2 unaligned
60  case 1: sad[3] = ff_pixelutils_sad_u_16x16_sse2; break; // src1 aligned, src2 unaligned
61  case 2: sad[3] = ff_pixelutils_sad_a_16x16_sse2; break; // src1 aligned, src2 aligned
62  }
63  }
64 }