blob: f2441046c37b20089a2c506d7d102fff9f0a7816
1 | /* |
2 | * copyright (c) Sebastien Bechet <s.bechet@av7.net> |
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 <errno.h> |
22 | #include <stdio.h> |
23 | #include <stdlib.h> |
24 | #include <string.h> |
25 | |
26 | #define SCALEBITS 8 |
27 | #define ONE_HALF (1 << (SCALEBITS - 1)) |
28 | #define FIX(x) ((int) ((x) * (1 << SCALEBITS) + 0.5)) |
29 | |
30 | #define err_if(expr) do { \ |
31 | if (expr) { \ |
32 | fprintf(stderr, "%s\n", strerror(errno)); \ |
33 | exit(1); \ |
34 | } \ |
35 | } while (0) |
36 | |
37 | static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb, |
38 | unsigned char *cr, const unsigned char *src, |
39 | int width, int height) |
40 | { |
41 | int wrap, wrap3, x, y; |
42 | int r, g, b, r1, g1, b1; |
43 | const unsigned char *p; |
44 | |
45 | wrap = width; |
46 | wrap3 = width * 3; |
47 | p = src; |
48 | for (y = 0; y < height; y += 2) { |
49 | for (x = 0; x < width; x += 2) { |
50 | r = p[0]; |
51 | g = p[1]; |
52 | b = p[2]; |
53 | r1 = r; |
54 | g1 = g; |
55 | b1 = b; |
56 | lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + |
57 | FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
58 | r = p[3]; |
59 | g = p[4]; |
60 | b = p[5]; |
61 | r1 += r; |
62 | g1 += g; |
63 | b1 += b; |
64 | lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + |
65 | FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
66 | p += wrap3; |
67 | lum += wrap; |
68 | |
69 | r = p[0]; |
70 | g = p[1]; |
71 | b = p[2]; |
72 | r1 += r; |
73 | g1 += g; |
74 | b1 += b; |
75 | lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + |
76 | FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
77 | r = p[3]; |
78 | g = p[4]; |
79 | b = p[5]; |
80 | r1 += r; |
81 | g1 += g; |
82 | b1 += b; |
83 | lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + |
84 | FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
85 | |
86 | cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + |
87 | FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; |
88 | cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - |
89 | FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; |
90 | |
91 | cb++; |
92 | cr++; |
93 | p += -wrap3 + 2 * 3; |
94 | lum += -wrap + 2; |
95 | } |
96 | p += wrap3; |
97 | lum += wrap; |
98 | } |
99 | } |
100 | |
101 | /* cif format */ |
102 | #define DEFAULT_WIDTH 352 |
103 | #define DEFAULT_HEIGHT 288 |
104 | #define DEFAULT_NB_PICT 50 |
105 | |
106 | static void pgmyuv_save(const char *filename, int w, int h, |
107 | const unsigned char *rgb_tab) |
108 | { |
109 | FILE *f; |
110 | int i, h2, w2; |
111 | unsigned char *cb, *cr; |
112 | unsigned char *lum_tab, *cb_tab, *cr_tab; |
113 | |
114 | lum_tab = malloc(w * h); |
115 | cb_tab = malloc(w * h / 4); |
116 | cr_tab = malloc(w * h / 4); |
117 | |
118 | rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h); |
119 | |
120 | if (filename) { |
121 | f = fopen(filename, "wb"); |
122 | fprintf(f, "P5\n%d %d\n%d\n", w, h * 3 / 2, 255); |
123 | } else { |
124 | f = stdout; |
125 | } |
126 | |
127 | err_if(fwrite(lum_tab, 1, w * h, f) != w * h); |
128 | h2 = h / 2; |
129 | w2 = w / 2; |
130 | cb = cb_tab; |
131 | cr = cr_tab; |
132 | |
133 | if (filename) { |
134 | for (i = 0; i < h2; i++) { |
135 | err_if(fwrite(cb, 1, w2, f) != w2); |
136 | err_if(fwrite(cr, 1, w2, f) != w2); |
137 | cb += w2; |
138 | cr += w2; |
139 | } |
140 | fclose(f); |
141 | } else { |
142 | for (i = 0; i < h2; i++) { |
143 | err_if(fwrite(cb, 1, w2, f) != w2); |
144 | cb += w2; |
145 | } |
146 | for (i = 0; i < h2; i++) { |
147 | err_if(fwrite(cr, 1, w2, f) != w2); |
148 | cr += w2; |
149 | } |
150 | } |
151 | |
152 | free(lum_tab); |
153 | free(cb_tab); |
154 | free(cr_tab); |
155 | } |
156 | |
157 | static unsigned char *rgb_tab; |
158 | static int width, height, wrap; |
159 | |
160 | static void put_pixel(int x, int y, int r, int g, int b) |
161 | { |
162 | unsigned char *p; |
163 | |
164 | if (x < 0 || x >= width || |
165 | y < 0 || y >= height) |
166 | return; |
167 | |
168 | p = rgb_tab + y * wrap + x * 3; |
169 | p[0] = r; |
170 | p[1] = g; |
171 | p[2] = b; |
172 | } |
173 |