1/*
2 * Copyright (C) 2013 Wei Gao <weigao@multicorewareinc.com>
3 * Copyright (C) 2013 Lenny Wang
4 *
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#ifndef AVFILTER_DESHAKE_OPENCL_KERNEL_H
24#define AVFILTER_DESHAKE_OPENCL_KERNEL_H
25
26#include "libavutil/opencl.h"
27
28const char *ff_kernel_deshake_opencl = AV_OPENCL_KERNEL(
29inline unsigned char pixel(global const unsigned char *src, int x, int y,
30                           int w, int h,int stride, unsigned char def)
31{
32    return (x < 0 || y < 0 || x >= w || y >= h) ? def : src[x + y * stride];
33}
34
35unsigned char interpolate_nearest(float x, float y, global const unsigned char *src,
36                                  int width, int height, int stride, unsigned char def)
37{
38    return pixel(src, (int)(x + 0.5f), (int)(y + 0.5f), width, height, stride, def);
39}
40
41unsigned char interpolate_bilinear(float x, float y, global const unsigned char *src,
42                                   int width, int height, int stride, unsigned char def)
43{
44    int x_c, x_f, y_c, y_f;
45    int v1, v2, v3, v4;
46    x_f = (int)x;
47    y_f = (int)y;
48    x_c = x_f + 1;
49    y_c = y_f + 1;
50
51    if (x_f < -1 || x_f > width || y_f < -1 || y_f > height) {
52        return def;
53    } else {
54        v4 = pixel(src, x_f, y_f, width, height, stride, def);
55        v2 = pixel(src, x_c, y_f, width, height, stride, def);
56        v3 = pixel(src, x_f, y_c, width, height, stride, def);
57        v1 = pixel(src, x_c, y_c, width, height, stride, def);
58        return (v1*(x - x_f)*(y - y_f) + v2*((x - x_f)*(y_c - y)) +
59                v3*(x_c - x)*(y - y_f) + v4*((x_c - x)*(y_c - y)));
60    }
61}
62
63unsigned char interpolate_biquadratic(float x, float y, global const unsigned char *src,
64                                      int width, int height, int stride, unsigned char def)
65{
66    int     x_c, x_f, y_c, y_f;
67    unsigned char v1,  v2,  v3,  v4;
68    float   f1,  f2,  f3,  f4;
69    x_f = (int)x;
70    y_f = (int)y;
71    x_c = x_f + 1;
72    y_c = y_f + 1;
73
74    if (x_f < - 1 || x_f > width || y_f < -1 || y_f > height)
75        return def;
76    else {
77        v4 = pixel(src, x_f, y_f, width, height, stride, def);
78        v2 = pixel(src, x_c, y_f, width, height, stride, def);
79        v3 = pixel(src, x_f, y_c, width, height, stride, def);
80        v1 = pixel(src, x_c, y_c, width, height, stride, def);
81
82        f1 = 1 - sqrt((x_c - x) * (y_c - y));
83        f2 = 1 - sqrt((x_c - x) * (y - y_f));
84        f3 = 1 - sqrt((x - x_f) * (y_c - y));
85        f4 = 1 - sqrt((x - x_f) * (y - y_f));
86        return (v1 * f1 + v2 * f2 + v3 * f3 + v4 * f4) / (f1 + f2 + f3 + f4);
87    }
88}
89
90inline const float clipf(float a, float amin, float amax)
91{
92    if      (a < amin) return amin;
93    else if (a > amax) return amax;
94    else               return a;
95}
96
97inline int mirror(int v, int m)
98{
99    while ((unsigned)v > (unsigned)m) {
100        v = -v;
101        if (v < 0)
102            v += 2 * m;
103    }
104    return v;
105}
106
107kernel void avfilter_transform_luma(global unsigned char *src,
108                                    global unsigned char *dst,
109                                    float4 matrix,
110                                    int interpolate,
111                                    int fill,
112                                    int src_stride_lu,
113                                    int dst_stride_lu,
114                                    int height,
115                                    int width)
116{
117    int x = get_global_id(0);
118    int y = get_global_id(1);
119    int idx_dst = y * dst_stride_lu + x;
120    unsigned char def = 0;
121    float x_s = x * matrix.x + y * matrix.y + matrix.z;
122    float y_s = x * (-matrix.y) + y * matrix.x + matrix.w;
123
124    if (x < width && y < height) {
125        switch (fill) {
126            case 0: //FILL_BLANK
127                def = 0;
128                break;
129            case 1: //FILL_ORIGINAL
130                def = src[y*src_stride_lu + x];
131                break;
132            case 2: //FILL_CLAMP
133                y_s = clipf(y_s, 0, height - 1);
134                x_s = clipf(x_s, 0, width - 1);
135                def = src[(int)y_s * src_stride_lu + (int)x_s];
136                break;
137            case 3: //FILL_MIRROR
138                y_s = mirror(y_s, height - 1);
139                x_s = mirror(x_s, width - 1);
140                def = src[(int)y_s * src_stride_lu + (int)x_s];
141                break;
142        }
143        switch (interpolate) {
144            case 0: //INTERPOLATE_NEAREST
145                dst[idx_dst] = interpolate_nearest(x_s, y_s, src, width, height, src_stride_lu, def);
146                break;
147            case 1: //INTERPOLATE_BILINEAR
148                dst[idx_dst] = interpolate_bilinear(x_s, y_s, src, width, height, src_stride_lu, def);
149                break;
150            case 2: //INTERPOLATE_BIQUADRATIC
151                dst[idx_dst] = interpolate_biquadratic(x_s, y_s, src, width, height, src_stride_lu, def);
152                break;
153            default:
154                return;
155        }
156    }
157}
158
159kernel void avfilter_transform_chroma(global unsigned char *src,
160                                      global unsigned char *dst,
161                                      float4 matrix,
162                                      int interpolate,
163                                      int fill,
164                                      int src_stride_lu,
165                                      int dst_stride_lu,
166                                      int src_stride_ch,
167                                      int dst_stride_ch,
168                                      int height,
169                                      int width,
170                                      int ch,
171                                      int cw)
172{
173
174    int x = get_global_id(0);
175    int y = get_global_id(1);
176    int pad_ch = get_global_size(1)>>1;
177    global unsigned char *dst_u = dst + height * dst_stride_lu;
178    global unsigned char *src_u = src + height * src_stride_lu;
179    global unsigned char *dst_v = dst_u + ch * dst_stride_ch;
180    global unsigned char *src_v = src_u + ch * src_stride_ch;
181    src = y < pad_ch ? src_u : src_v;
182    dst = y < pad_ch ? dst_u : dst_v;
183    y = select(y - pad_ch, y, y < pad_ch);
184    float x_s = x * matrix.x + y * matrix.y + matrix.z;
185    float y_s = x * (-matrix.y) + y * matrix.x + matrix.w;
186    int idx_dst = y * dst_stride_ch + x;
187    unsigned char def;
188
189    if (x < cw && y < ch) {
190        switch (fill) {
191            case 0: //FILL_BLANK
192                def = 0;
193                break;
194            case 1: //FILL_ORIGINAL
195                def = src[y*src_stride_ch + x];
196                break;
197            case 2: //FILL_CLAMP
198                y_s = clipf(y_s, 0, ch - 1);
199                x_s = clipf(x_s, 0, cw - 1);
200                def = src[(int)y_s * src_stride_ch + (int)x_s];
201                break;
202            case 3: //FILL_MIRROR
203                y_s = mirror(y_s, ch - 1);
204                x_s = mirror(x_s, cw - 1);
205                def = src[(int)y_s * src_stride_ch + (int)x_s];
206                break;
207        }
208        switch (interpolate) {
209            case 0: //INTERPOLATE_NEAREST
210                dst[idx_dst] = interpolate_nearest(x_s, y_s, src, cw, ch, src_stride_ch, def);
211                break;
212            case 1: //INTERPOLATE_BILINEAR
213                dst[idx_dst] = interpolate_bilinear(x_s, y_s, src, cw, ch, src_stride_ch, def);
214                break;
215            case 2: //INTERPOLATE_BIQUADRATIC
216                dst[idx_dst] = interpolate_biquadratic(x_s, y_s, src, cw, ch, src_stride_ch, def);
217                break;
218            default:
219                return;
220        }
221    }
222}
223);
224
225#endif /* AVFILTER_DESHAKE_OPENCL_KERNEL_H */
226