FFmpeg
colorspacedsp_yuv2yuv_template.c
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1 /*
2  * Copyright (c) 2016 Ronald S. Bultje <rsbultje@gmail.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/avassert.h"
22 
23 #undef opixel
24 #define opixel pixel
25 
26 #undef ipixel
27 #if IN_BIT_DEPTH == 8
28 #define ipixel uint8_t
29 #else
30 #define ipixel uint16_t
31 #endif
32 
33 #undef fn
34 #undef fn2
35 #undef fn3
36 #define fn3(a,b,c,d) a##_##d##p##b##to##c##_c
37 #define fn2(a,b,c,d) fn3(a,b,c,d)
38 #define fn(a) fn2(a, IN_BIT_DEPTH, OUT_BIT_DEPTH, ss)
39 
40 static void fn(yuv2yuv)(uint8_t *_dst[3], const ptrdiff_t dst_stride[3],
41  uint8_t *_src[3], const ptrdiff_t src_stride[3],
42  int w, int h, const int16_t c[3][3][8],
43  const int16_t yuv_offset[2][8])
44 {
45  opixel **dst = (opixel **) _dst;
46  ipixel **src = (ipixel **) _src;
47  const ipixel *src0 = src[0], *src1 = src[1], *src2 = src[2];
48  opixel *dst0 = dst[0], *dst1 = dst[1], *dst2 = dst[2];
49  int y, x;
50  const int sh = 14 + IN_BIT_DEPTH - OUT_BIT_DEPTH;
51  const int rnd = 1 << (sh - 1);
52  int y_off_in = yuv_offset[0][0];
53  int y_off_out = yuv_offset[1][0] << sh;
54  const int uv_off_in = 128 << (IN_BIT_DEPTH - 8);
55  const int uv_off_out = rnd + (128 << (OUT_BIT_DEPTH - 8 + sh));
56  int cyy = c[0][0][0], cyu = c[0][1][0], cyv = c[0][2][0];
57  int cuu = c[1][1][0], cuv = c[1][2][0], cvu = c[2][1][0], cvv = c[2][2][0];
58 
59  av_assert2(c[1][0][0] == 0);
60  av_assert2(c[2][0][0] == 0);
61  w = AV_CEIL_RSHIFT(w, SS_W);
62  h = AV_CEIL_RSHIFT(h, SS_H);
63  for (y = 0; y < h; y++) {
64  for (x = 0; x < w; x++) {
65  int y00 = src0[x << SS_W] - y_off_in;
66 #if SS_W == 1
67  int y01 = src0[2 * x + 1] - y_off_in;
68 #if SS_H == 1
69  int y10 = src0[src_stride[0] / sizeof(ipixel) + 2 * x] - y_off_in;
70  int y11 = src0[src_stride[0] / sizeof(ipixel) + 2 * x + 1] - y_off_in;
71 #endif
72 #endif
73  int u = src1[x] - uv_off_in, v = src2[x] - uv_off_in;
74  int uv_val = cyu * u + cyv * v + rnd + y_off_out;
75 
76  dst0[x << SS_W] = av_clip_pixel((cyy * y00 + uv_val) >> sh);
77 #if SS_W == 1
78  dst0[x * 2 + 1] = av_clip_pixel((cyy * y01 + uv_val) >> sh);
79 #if SS_H == 1
80  dst0[x * 2 + 0 + dst_stride[0] / sizeof(opixel)] =
81  av_clip_pixel((cyy * y10 + uv_val) >> sh);
82  dst0[x * 2 + 1 + dst_stride[0] / sizeof(opixel)] =
83  av_clip_pixel((cyy * y11 + uv_val) >> sh);
84 #endif
85 #endif
86 
87  dst1[x] = av_clip_pixel((u * cuu + v * cuv + uv_off_out) >> sh);
88  dst2[x] = av_clip_pixel((u * cvu + v * cvv + uv_off_out) >> sh);
89  }
90 
91  dst0 += (dst_stride[0] * (1 << SS_H)) / sizeof(opixel);
92  dst1 += dst_stride[1] / sizeof(opixel);
93  dst2 += dst_stride[2] / sizeof(opixel);
94  src0 += (src_stride[0] * (1 << SS_H)) / sizeof(ipixel);
95  src1 += src_stride[1] / sizeof(ipixel);
96  src2 += src_stride[2] / sizeof(ipixel);
97  }
98 }
#define IN_BIT_DEPTH
#define fn(a)
#define OUT_BIT_DEPTH
static void fn() yuv2yuv(uint8_t *_dst[3], const ptrdiff_t dst_stride[3], uint8_t *_src[3], const ptrdiff_t src_stride[3], int w, int h, const int16_t c[3][3][8], const int16_t yuv_offset[2][8])
#define src
Definition: vp8dsp.c:254
#define SS_W
Definition: colorspacedsp.c:62
#define av_clip_pixel(a)
uint8_t
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
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
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:252
simple assert() macros that are a bit more flexible than ISO C assert().
uint8_t w
Definition: llviddspenc.c:38
#define src1
Definition: h264pred.c:139
#define src0
Definition: h264pred.c:138
#define rnd()
Definition: checkasm.h:105
#define SS_H
Definition: colorspacedsp.c:63
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58