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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * copyright (c) Sebastien Bechet |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #include |
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| 22 | #include |
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| 23 | #include |
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| 24 | #include |
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| 25 | |||
| 26 | #define SCALEBITS 8 |
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| 27 | #define ONE_HALF (1 << (SCALEBITS - 1)) |
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| 28 | #define FIX(x) ((int) ((x) * (1L << SCALEBITS) + 0.5)) |
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| 29 | |||
| 30 | #define err_if(expr) do { \ |
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| 31 | if (expr) { \ |
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| 32 | fprintf(stderr, "%s\n", strerror(errno)); \ |
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| 33 | exit(1); \ |
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| 34 | } \ |
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| 35 | } while (0) |
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| 36 | |||
| 37 | static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb, |
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| 38 | unsigned char *cr, unsigned char *src, |
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| 39 | int width, int height) |
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| 40 | { |
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| 41 | int wrap, wrap3, x, y; |
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| 42 | int r, g, b, r1, g1, b1; |
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| 43 | unsigned char *p; |
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| 44 | |||
| 45 | wrap = width; |
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| 46 | wrap3 = width * 3; |
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| 47 | p = src; |
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| 48 | for (y = 0; y < height; y += 2) { |
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| 49 | for (x = 0; x < width; x += 2) { |
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| 50 | r = p[0]; |
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| 51 | g = p[1]; |
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| 52 | b = p[2]; |
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| 53 | r1 = r; |
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| 54 | g1 = g; |
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| 55 | b1 = b; |
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| 56 | lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + |
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| 57 | FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
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| 58 | r = p[3]; |
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| 59 | g = p[4]; |
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| 60 | b = p[5]; |
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| 61 | r1 += r; |
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| 62 | g1 += g; |
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| 63 | b1 += b; |
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| 64 | lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + |
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| 65 | FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
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| 66 | p += wrap3; |
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| 67 | lum += wrap; |
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| 68 | |||
| 69 | r = p[0]; |
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| 70 | g = p[1]; |
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| 71 | b = p[2]; |
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| 72 | r1 += r; |
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| 73 | g1 += g; |
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| 74 | b1 += b; |
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| 75 | lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + |
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| 76 | FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
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| 77 | r = p[3]; |
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| 78 | g = p[4]; |
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| 79 | b = p[5]; |
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| 80 | r1 += r; |
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| 81 | g1 += g; |
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| 82 | b1 += b; |
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| 83 | lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + |
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| 84 | FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
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| 85 | |||
| 86 | cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + |
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| 87 | FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; |
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| 88 | cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - |
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| 89 | FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; |
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| 90 | |||
| 91 | cb++; |
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| 92 | cr++; |
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| 93 | p += -wrap3 + 2 * 3; |
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| 94 | lum += -wrap + 2; |
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| 95 | } |
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| 96 | p += wrap3; |
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| 97 | lum += wrap; |
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| 98 | } |
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| 99 | } |
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| 100 | |||
| 101 | /* cif format */ |
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| 102 | #define DEFAULT_WIDTH 352 |
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| 103 | #define DEFAULT_HEIGHT 288 |
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| 104 | #define DEFAULT_NB_PICT 50 |
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| 105 | |||
| 106 | static void pgmyuv_save(const char *filename, int w, int h, |
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| 107 | unsigned char *rgb_tab) |
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| 108 | { |
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| 109 | FILE *f; |
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| 110 | int i, h2, w2; |
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| 111 | unsigned char *cb, *cr; |
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| 112 | unsigned char *lum_tab, *cb_tab, *cr_tab; |
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| 113 | |||
| 114 | lum_tab = malloc(w * h); |
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| 115 | cb_tab = malloc(w * h / 4); |
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| 116 | cr_tab = malloc(w * h / 4); |
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| 117 | |||
| 118 | rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h); |
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| 119 | |||
| 120 | if (filename) { |
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| 121 | f = fopen(filename, "wb"); |
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| 122 | fprintf(f, "P5\n%d %d\n%d\n", w, h * 3 / 2, 255); |
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| 123 | } else { |
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| 124 | f = stdout; |
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| 125 | } |
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| 126 | |||
| 127 | err_if(fwrite(lum_tab, 1, w * h, f) != w * h); |
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| 128 | h2 = h / 2; |
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| 129 | w2 = w / 2; |
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| 130 | cb = cb_tab; |
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| 131 | cr = cr_tab; |
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| 132 | |||
| 133 | if (filename) { |
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| 134 | for (i = 0; i < h2; i++) { |
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| 135 | err_if(fwrite(cb, 1, w2, f) != w2); |
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| 136 | err_if(fwrite(cr, 1, w2, f) != w2); |
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| 137 | cb += w2; |
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| 138 | cr += w2; |
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| 139 | } |
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| 140 | fclose(f); |
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| 141 | } else { |
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| 142 | for (i = 0; i < h2; i++) { |
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| 143 | err_if(fwrite(cb, 1, w2, f) != w2); |
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| 144 | cb += w2; |
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| 145 | } |
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| 146 | for (i = 0; i < h2; i++) { |
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| 147 | err_if(fwrite(cr, 1, w2, f) != w2); |
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| 148 | cr += w2; |
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| 149 | } |
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| 150 | } |
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| 151 | |||
| 152 | free(lum_tab); |
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| 153 | free(cb_tab); |
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| 154 | free(cr_tab); |
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| 155 | } |
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| 156 | |||
| 157 | static unsigned char *rgb_tab; |
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| 158 | static int width, height, wrap; |
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| 159 | |||
| 160 | static void put_pixel(int x, int y, int r, int g, int b) |
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| 161 | { |
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| 162 | unsigned char *p; |
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| 163 | |||
| 164 | if (x < 0 || x >= width || |
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| 165 | y < 0 || y >= height) |
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| 166 | return; |
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| 167 | |||
| 168 | p = rgb_tab + y * wrap + x * 3; |
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| 169 | p[0] = r; |
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| 170 | p[1] = g; |
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| 171 | p[2] = b; |
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| 172 | } |