FFmpeg
videodsp_template.c
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1 /*
2  * Copyright (c) 2002-2012 Michael Niedermayer
3  * Copyright (C) 2012 Ronald S. Bultje
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "bit_depth_template.c"
23 #if BIT_DEPTH != 8
24 // ff_emulated_edge_mc_8 is used by the x86 MpegVideoDSP API.
25 static
26 #endif
27 void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
28  ptrdiff_t buf_linesize,
29  ptrdiff_t src_linesize,
30  int block_w, int block_h,
31  int src_x, int src_y, int w, int h)
32 {
33  int x, y;
34  int start_y, start_x, end_y, end_x;
35 
36  if (!w || !h)
37  return;
38 
39  av_assert2(block_w * sizeof(pixel) <= FFABS(buf_linesize));
40 
41  if (src_y >= h) {
42  src -= src_y * src_linesize;
43  src += (h - 1) * src_linesize;
44  src_y = h - 1;
45  } else if (src_y <= -block_h) {
46  src -= src_y * src_linesize;
47  src += (1 - block_h) * src_linesize;
48  src_y = 1 - block_h;
49  }
50  if (src_x >= w) {
51  // The subtracted expression has an unsigned type and must thus not be negative
52  src -= (1 + src_x - w) * sizeof(pixel);
53  src_x = w - 1;
54  } else if (src_x <= -block_w) {
55  src += (1 - block_w - src_x) * sizeof(pixel);
56  src_x = 1 - block_w;
57  }
58 
59  start_y = FFMAX(0, -src_y);
60  start_x = FFMAX(0, -src_x);
61  end_y = FFMIN(block_h, h-src_y);
62  end_x = FFMIN(block_w, w-src_x);
63  av_assert2(start_y < end_y && block_h);
64  av_assert2(start_x < end_x && block_w);
65 
66  w = end_x - start_x;
67  src += start_y * src_linesize + start_x * (ptrdiff_t)sizeof(pixel);
68  buf += start_x * sizeof(pixel);
69 
70  // top
71  for (y = 0; y < start_y; y++) {
72  memcpy(buf, src, w * sizeof(pixel));
73  buf += buf_linesize;
74  }
75 
76  // copy existing part
77  for (; y < end_y; y++) {
78  memcpy(buf, src, w * sizeof(pixel));
79  src += src_linesize;
80  buf += buf_linesize;
81  }
82 
83  // bottom
84  src -= src_linesize;
85  for (; y < block_h; y++) {
86  memcpy(buf, src, w * sizeof(pixel));
87  buf += buf_linesize;
88  }
89 
90  buf -= block_h * buf_linesize + start_x * (ptrdiff_t)sizeof(pixel);
91  while (block_h--) {
92  pixel *bufp = (pixel *) buf;
93 
94  // left
95  for(x = 0; x < start_x; x++) {
96  bufp[x] = bufp[start_x];
97  }
98 
99  // right
100  for (x = end_x; x < block_w; x++) {
101  bufp[x] = bufp[end_x - 1];
102  }
103  buf += buf_linesize;
104  }
105 }
w
uint8_t w
Definition: llviddspenc.c:38
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
ff_emulated_edge_mc
static void FUNC() ff_emulated_edge_mc(uint8_t *buf, const uint8_t *src, ptrdiff_t buf_linesize, ptrdiff_t src_linesize, int block_w, int block_h, int src_x, int src_y, int w, int h)
Definition: videodsp_template.c:27
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:74
pixel
uint8_t pixel
Definition: tiny_ssim.c:41
bit_depth_template.c
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:67
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
FUNC
#define FUNC(a)
Definition: bit_depth_template.c:104
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
h
h
Definition: vp9dsp_template.c:2038