FFmpeg
pixelutils.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 <stddef.h>
20 
21 #include "config.h"
22 #include "pixelutils.h"
23 
24 #if CONFIG_PIXELUTILS
25 #include <stdlib.h>
26 #include <string.h>
27 
28 #include "attributes.h"
29 #include "macros.h"
30 
31 #include "x86/pixelutils.h"
32 
33 static av_always_inline int sad_wxh(const uint8_t *src1, ptrdiff_t stride1,
34  const uint8_t *src2, ptrdiff_t stride2,
35  int w, int h)
36 {
37  int x, y, sum = 0;
38 
39  for (y = 0; y < h; y++) {
40  for (x = 0; x < w; x++)
41  sum += abs(src1[x] - src2[x]);
42  src1 += stride1;
43  src2 += stride2;
44  }
45  return sum;
46 }
47 
48 #define DECLARE_BLOCK_FUNCTIONS(size) \
49 static int block_sad_##size##x##size##_c(const uint8_t *src1, ptrdiff_t stride1, \
50  const uint8_t *src2, ptrdiff_t stride2) \
51 { \
52  return sad_wxh(src1, stride1, src2, stride2, size, size); \
53 }
54 
55 DECLARE_BLOCK_FUNCTIONS(2)
56 DECLARE_BLOCK_FUNCTIONS(4)
57 DECLARE_BLOCK_FUNCTIONS(8)
58 DECLARE_BLOCK_FUNCTIONS(16)
59 DECLARE_BLOCK_FUNCTIONS(32)
60 
61 static const av_pixelutils_sad_fn sad_c[] = {
62  block_sad_2x2_c,
63  block_sad_4x4_c,
64  block_sad_8x8_c,
65  block_sad_16x16_c,
66  block_sad_32x32_c,
67 };
68 #else
69 #include "log.h"
70 #endif /* CONFIG_PIXELUTILS */
71 
72 av_pixelutils_sad_fn av_pixelutils_get_sad_fn(int w_bits, int h_bits, int aligned, void *log_ctx)
73 {
74 #if !CONFIG_PIXELUTILS
75  av_log(log_ctx, AV_LOG_ERROR, "pixelutils support is required "
76  "but libavutil is not compiled with it\n");
77  return NULL;
78 #else
80 
81  memcpy(sad, sad_c, sizeof(sad));
82 
83  if (w_bits < 1 || w_bits > FF_ARRAY_ELEMS(sad) ||
84  h_bits < 1 || h_bits > FF_ARRAY_ELEMS(sad))
85  return NULL;
86  if (w_bits != h_bits) // only squared sad for now
87  return NULL;
88 
89 #if ARCH_X86
91 #endif
92 
93  return sad[w_bits - 1];
94 #endif
95 }
src1
const pixel * src1
Definition: h264pred_template.c:421
av_pixelutils_sad_fn
int(* av_pixelutils_sad_fn)(const uint8_t *src1, ptrdiff_t stride1, const uint8_t *src2, ptrdiff_t stride2)
Sum of abs(src1[x] - src2[x])
Definition: pixelutils.h:28
w
uint8_t w
Definition: llviddspenc.c:38
pixelutils.h
macros.h
aligned
static int aligned(int val)
Definition: dashdec.c:168
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
ff_pixelutils_sad_init_x86
void ff_pixelutils_sad_init_x86(av_pixelutils_sad_fn *sad, int aligned)
Definition: pixelutils_init.c:48
NULL
#define NULL
Definition: coverity.c:32
abs
#define abs(x)
Definition: cuda_runtime.h:35
pixelutils.h
attributes.h
log.h
src2
const pixel * src2
Definition: h264pred_template.c:422
av_always_inline
#define av_always_inline
Definition: attributes.h:49
av_pixelutils_get_sad_fn
av_pixelutils_sad_fn av_pixelutils_get_sad_fn(int w_bits, int h_bits, int aligned, void *log_ctx)
Get a potentially optimized pointer to a Sum-of-absolute-differences function (see the av_pixelutils_...
Definition: pixelutils.c:72
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
h
h
Definition: vp9dsp_template.c:2038