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videodsp_init.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 "config.h"
23 #include "libavutil/attributes.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/common.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/mem.h"
28 #include "libavutil/x86/asm.h"
29 #include "libavcodec/videodsp.h"
30 
31 #if HAVE_YASM
32 typedef void emu_edge_core_func(uint8_t *buf, const uint8_t *src,
33  x86_reg linesize, x86_reg start_y,
34  x86_reg end_y, x86_reg block_h,
35  x86_reg start_x, x86_reg end_x,
36  x86_reg block_w);
37 extern emu_edge_core_func ff_emu_edge_core_mmx;
38 extern emu_edge_core_func ff_emu_edge_core_sse;
39 
40 static av_always_inline void emulated_edge_mc(uint8_t *buf, const uint8_t *src,
41  ptrdiff_t linesize_arg,
42  int block_w, int block_h,
43  int src_x, int src_y,
44  int w, int h,
45  emu_edge_core_func *core_fn)
46 {
47  int start_y, start_x, end_y, end_x, src_y_add = 0;
48  int linesize = linesize_arg;
49 
50  if(!w || !h)
51  return;
52 
53  if (src_y >= h) {
54  src -= src_y*linesize;
55  src_y_add = h - 1;
56  src_y = h - 1;
57  } else if (src_y <= -block_h) {
58  src -= src_y*linesize;
59  src_y_add = 1 - block_h;
60  src_y = 1 - block_h;
61  }
62  if (src_x >= w) {
63  src += w - 1 - src_x;
64  src_x = w - 1;
65  } else if (src_x <= -block_w) {
66  src += 1 - block_w - src_x;
67  src_x = 1 - block_w;
68  }
69 
70  start_y = FFMAX(0, -src_y);
71  start_x = FFMAX(0, -src_x);
72  end_y = FFMIN(block_h, h-src_y);
73  end_x = FFMIN(block_w, w-src_x);
74  av_assert2(start_x < end_x && block_w > 0);
75  av_assert2(start_y < end_y && block_h > 0);
76 
77  // fill in the to-be-copied part plus all above/below
78  src += (src_y_add + start_y) * linesize + start_x;
79  buf += start_x;
80  core_fn(buf, src, linesize, start_y, end_y,
81  block_h, start_x, end_x, block_w);
82 }
83 
84 #if ARCH_X86_32
85 static av_noinline void emulated_edge_mc_mmx(uint8_t *buf, const uint8_t *src,
86  ptrdiff_t linesize,
87  int block_w, int block_h,
88  int src_x, int src_y, int w, int h)
89 {
90  emulated_edge_mc(buf, src, linesize, block_w, block_h, src_x, src_y,
91  w, h, &ff_emu_edge_core_mmx);
92 }
93 #endif
94 
95 static av_noinline void emulated_edge_mc_sse(uint8_t *buf, const uint8_t *src,
96  ptrdiff_t linesize,
97  int block_w, int block_h,
98  int src_x, int src_y, int w, int h)
99 {
100  emulated_edge_mc(buf, src, linesize, block_w, block_h, src_x, src_y,
101  w, h, &ff_emu_edge_core_sse);
102 }
103 #endif /* HAVE_YASM */
104 
105 void ff_prefetch_mmxext(uint8_t *buf, ptrdiff_t stride, int h);
106 void ff_prefetch_3dnow(uint8_t *buf, ptrdiff_t stride, int h);
107 
109 {
110 #if HAVE_YASM
111  int mm_flags = av_get_cpu_flags();
112 
113 #if ARCH_X86_32
114  if (bpc <= 8 && mm_flags & AV_CPU_FLAG_MMX) {
115  ctx->emulated_edge_mc = emulated_edge_mc_mmx;
116  }
117  if (mm_flags & AV_CPU_FLAG_3DNOW) {
119  }
120 #endif /* ARCH_X86_32 */
121  if (mm_flags & AV_CPU_FLAG_MMXEXT) {
123  }
124  if (bpc <= 8 && mm_flags & AV_CPU_FLAG_SSE) {
125  ctx->emulated_edge_mc = emulated_edge_mc_sse;
126  }
127 #endif /* HAVE_YASM */
128 }