| 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) * (1L << 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 | } |