FFmpeg
yuv2rgb_template.c
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1 /*
2  * software YUV to RGB converter
3  *
4  * Copyright (C) 2001-2007 Michael Niedermayer
5  * (c) 2010 Konstantin Shishkov
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include <stdint.h>
25 
26 #include "libavutil/x86/asm.h"
27 #include "libswscale/swscale_internal.h"
28 
29 #define YUV2RGB_LOOP(depth) \
30  h_size = (c->dstW + 7) & ~7; \
31  if (h_size * depth > FFABS(dstStride[0])) \
32  h_size -= 8; \
33  \
34  vshift = c->srcFormat != AV_PIX_FMT_YUV422P; \
35  \
36  for (y = 0; y < srcSliceH; y++) { \
37  uint8_t *image = dst[0] + (y + srcSliceY) * dstStride[0]; \
38  const uint8_t *py = src[0] + y * srcStride[0]; \
39  const uint8_t *pu = src[1] + (y >> vshift) * srcStride[1]; \
40  const uint8_t *pv = src[2] + (y >> vshift) * srcStride[2]; \
41  x86_reg index = -h_size / 2; \
42 
43 extern void RENAME(ff_yuv_420_rgb24)(x86_reg index, uint8_t *image, const uint8_t *pu_index,
44  const uint8_t *pv_index, const uint64_t *pointer_c_dither,
45  const uint8_t *py_2index);
46 extern void RENAME(ff_yuv_420_bgr24)(x86_reg index, uint8_t *image, const uint8_t *pu_index,
47  const uint8_t *pv_index, const uint64_t *pointer_c_dither,
48  const uint8_t *py_2index);
49 
50 #if !COMPILE_TEMPLATE_MMXEXT
51 extern void RENAME(ff_yuv_420_rgb15)(x86_reg index, uint8_t *image, const uint8_t *pu_index,
52  const uint8_t *pv_index, const uint64_t *pointer_c_dither,
53  const uint8_t *py_2index);
54 extern void RENAME(ff_yuv_420_rgb16)(x86_reg index, uint8_t *image, const uint8_t *pu_index,
55  const uint8_t *pv_index, const uint64_t *pointer_c_dither,
56  const uint8_t *py_2index);
57 extern void RENAME(ff_yuv_420_rgb32)(x86_reg index, uint8_t *image, const uint8_t *pu_index,
58  const uint8_t *pv_index, const uint64_t *pointer_c_dither,
59  const uint8_t *py_2index);
60 extern void RENAME(ff_yuv_420_bgr32)(x86_reg index, uint8_t *image, const uint8_t *pu_index,
61  const uint8_t *pv_index, const uint64_t *pointer_c_dither,
62  const uint8_t *py_2index);
63 extern void RENAME(ff_yuva_420_rgb32)(x86_reg index, uint8_t *image, const uint8_t *pu_index,
64  const uint8_t *pv_index, const uint64_t *pointer_c_dither,
65  const uint8_t *py_2index, const uint8_t *pa_2index);
66 extern void RENAME(ff_yuva_420_bgr32)(x86_reg index, uint8_t *image, const uint8_t *pu_index,
67  const uint8_t *pv_index, const uint64_t *pointer_c_dither,
68  const uint8_t *py_2index, const uint8_t *pa_2index);
69 
70 static inline int RENAME(yuv420_rgb15)(SwsContext *c, const uint8_t *src[],
71  int srcStride[],
72  int srcSliceY, int srcSliceH,
73  uint8_t *dst[], int dstStride[])
74 {
75  int y, h_size, vshift;
76 
77  YUV2RGB_LOOP(2)
78 
79 #ifdef DITHER1XBPP
80  c->blueDither = ff_dither8[y & 1];
81  c->greenDither = ff_dither8[y & 1];
82  c->redDither = ff_dither8[(y + 1) & 1];
83 #endif
84 
85  RENAME(ff_yuv_420_rgb15)(index, image, pu - index, pv - index, &(c->redDither), py - 2 * index);
86  }
87  return srcSliceH;
88 }
89 
90 static inline int RENAME(yuv420_rgb16)(SwsContext *c, const uint8_t *src[],
91  int srcStride[],
92  int srcSliceY, int srcSliceH,
93  uint8_t *dst[], int dstStride[])
94 {
95  int y, h_size, vshift;
96 
97  YUV2RGB_LOOP(2)
98 
99 #ifdef DITHER1XBPP
100  c->blueDither = ff_dither8[y & 1];
101  c->greenDither = ff_dither4[y & 1];
102  c->redDither = ff_dither8[(y + 1) & 1];
103 #endif
104 
105  RENAME(ff_yuv_420_rgb16)(index, image, pu - index, pv - index, &(c->redDither), py - 2 * index);
106  }
107  return srcSliceH;
108 }
109 
110 static inline int RENAME(yuv420_rgb32)(SwsContext *c, const uint8_t *src[],
111  int srcStride[],
112  int srcSliceY, int srcSliceH,
113  uint8_t *dst[], int dstStride[])
114 {
115  int y, h_size, vshift;
116 
117  YUV2RGB_LOOP(4)
118 
119  RENAME(ff_yuv_420_rgb32)(index, image, pu - index, pv - index, &(c->redDither), py - 2 * index);
120  }
121  return srcSliceH;
122 }
123 
124 static inline int RENAME(yuv420_bgr32)(SwsContext *c, const uint8_t *src[],
125  int srcStride[],
126  int srcSliceY, int srcSliceH,
127  uint8_t *dst[], int dstStride[])
128 {
129  int y, h_size, vshift;
130 
131  YUV2RGB_LOOP(4)
132 
133  RENAME(ff_yuv_420_bgr32)(index, image, pu - index, pv - index, &(c->redDither), py - 2 * index);
134  }
135  return srcSliceH;
136 }
137 
138 static inline int RENAME(yuva420_rgb32)(SwsContext *c, const uint8_t *src[],
139  int srcStride[],
140  int srcSliceY, int srcSliceH,
141  uint8_t *dst[], int dstStride[])
142 {
143  int y, h_size, vshift;
144  YUV2RGB_LOOP(4)
145 
146  const uint8_t *pa = src[3] + y * srcStride[3];
147  RENAME(ff_yuva_420_rgb32)(index, image, pu - index, pv - index, &(c->redDither), py - 2 * index, pa - 2 * index);
148  }
149  return srcSliceH;
150 }
151 
152 static inline int RENAME(yuva420_bgr32)(SwsContext *c, const uint8_t *src[],
153  int srcStride[],
154  int srcSliceY, int srcSliceH,
155  uint8_t *dst[], int dstStride[])
156 {
157  int y, h_size, vshift;
158 
159  YUV2RGB_LOOP(4)
160 
161  const uint8_t *pa = src[3] + y * srcStride[3];
162  RENAME(ff_yuva_420_bgr32)(index, image, pu - index, pv - index, &(c->redDither), py - 2 * index, pa - 2 * index);
163  }
164  return srcSliceH;
165 }
166 #endif
167 
168 static inline int RENAME(yuv420_rgb24)(SwsContext *c, const uint8_t *src[],
169  int srcStride[],
170  int srcSliceY, int srcSliceH,
171  uint8_t *dst[], int dstStride[])
172 {
173  int y, h_size, vshift;
174 
175  YUV2RGB_LOOP(3)
176 
177  RENAME(ff_yuv_420_rgb24)(index, image, pu - index, pv - index, &(c->redDither), py - 2 * index);
178  }
179  return srcSliceH;
180 }
181 
182 static inline int RENAME(yuv420_bgr24)(SwsContext *c, const uint8_t *src[],
183  int srcStride[],
184  int srcSliceY, int srcSliceH,
185  uint8_t *dst[], int dstStride[])
186 {
187  int y, h_size, vshift;
188 
189  YUV2RGB_LOOP(3)
190 
191  RENAME(ff_yuv_420_bgr24)(index, image, pu - index, pv - index, &(c->redDither), py - 2 * index);
192  }
193  return srcSliceH;
194 }
195 
index
fg index
Definition: ffmpeg_filter.c:168
YUV2RGB_LOOP
#define YUV2RGB_LOOP(depth)
Definition: yuv2rgb_template.c:29
ff_dither4
const uint64_t ff_dither4[2]
Definition: swscale.c:33
src
#define src
Definition: vp8dsp.c:255
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
asm.h
srcSliceH
return srcSliceH
Definition: yuv2rgb_template.c:87
RENAME
#define RENAME(name)
Definition: ffv1.h:195
swscale_internal.h
pv
#define pv
Definition: regdef.h:60
ff_dither8
const uint64_t ff_dither8[2]
Definition: swscale.c:37
x86_reg
int x86_reg
Definition: asm.h:72
SwsContext
Definition: swscale_internal.h:298
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