| 1 | /* |
| 2 | * Generate a synthetic YUV video sequence suitable for codec testing. |
| 3 | * |
| 4 | * copyright (c) Sebastien Bechet <s.bechet@av7.net> |
| 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 | #include <stdlib.h> |
| 24 | #include <stdio.h> |
| 25 | #include <inttypes.h> |
| 26 | |
| 27 | #include "utils.c" |
| 28 | |
| 29 | #define FIXP (1 << 16) |
| 30 | #define MY_PI 205887 // (M_PI * FIX) |
| 31 | |
| 32 | static int64_t int_pow(int64_t a, int p) |
| 33 | { |
| 34 | int64_t v = FIXP; |
| 35 | |
| 36 | for (; p; p--) { |
| 37 | v *= a; |
| 38 | v /= FIXP; |
| 39 | } |
| 40 | |
| 41 | return v; |
| 42 | } |
| 43 | |
| 44 | static int64_t int_sin(int64_t a) |
| 45 | { |
| 46 | if (a < 0) |
| 47 | a = MY_PI - a; // 0..inf |
| 48 | a %= 2 * MY_PI; // 0..2PI |
| 49 | |
| 50 | if (a >= MY_PI * 3 / 2) |
| 51 | a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2 |
| 52 | if (a >= MY_PI / 2) |
| 53 | a = MY_PI - a; // -PI / 2 .. PI / 2 |
| 54 | |
| 55 | return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040; |
| 56 | } |
| 57 | |
| 58 | static unsigned char tab_r[256 * 256]; |
| 59 | static unsigned char tab_g[256 * 256]; |
| 60 | static unsigned char tab_b[256 * 256]; |
| 61 | |
| 62 | static int h_cos[360]; |
| 63 | static int h_sin[360]; |
| 64 | |
| 65 | static int ipol(uint8_t *src, int x, int y) |
| 66 | { |
| 67 | int int_x = x >> 16; |
| 68 | int int_y = y >> 16; |
| 69 | int frac_x = x & 0xFFFF; |
| 70 | int frac_y = y & 0xFFFF; |
| 71 | int s00 = src[( int_x & 255) + 256 * ( int_y & 255)]; |
| 72 | int s01 = src[((int_x + 1) & 255) + 256 * ( int_y & 255)]; |
| 73 | int s10 = src[( int_x & 255) + 256 * ((int_y + 1) & 255)]; |
| 74 | int s11 = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)]; |
| 75 | int s0 = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8; |
| 76 | int s1 = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8; |
| 77 | |
| 78 | return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24; |
| 79 | } |
| 80 | |
| 81 | static void gen_image(int num, int w, int h) |
| 82 | { |
| 83 | const int c = h_cos[num % 360]; |
| 84 | const int s = h_sin[num % 360]; |
| 85 | |
| 86 | const int xi = -(w / 2) * c; |
| 87 | const int yi = (w / 2) * s; |
| 88 | |
| 89 | const int xj = -(h / 2) * s; |
| 90 | const int yj = -(h / 2) * c; |
| 91 | int i, j; |
| 92 | |
| 93 | int x, y; |
| 94 | int xprime = xj; |
| 95 | int yprime = yj; |
| 96 | |
| 97 | for (j = 0; j < h; j++) { |
| 98 | x = xprime + xi + FIXP * w / 2; |
| 99 | xprime += s; |
| 100 | |
| 101 | y = yprime + yi + FIXP * h / 2; |
| 102 | yprime += c; |
| 103 | |
| 104 | for (i = 0; i < w; i++) { |
| 105 | x += c; |
| 106 | y -= s; |
| 107 | put_pixel(i, j, |
| 108 | ipol(tab_r, x, y), |
| 109 | ipol(tab_g, x, y), |
| 110 | ipol(tab_b, x, y)); |
| 111 | } |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | #define W 256 |
| 116 | #define H 256 |
| 117 | |
| 118 | static int init_demo(const char *filename) |
| 119 | { |
| 120 | int i, j; |
| 121 | int h; |
| 122 | int radian; |
| 123 | char line[3 * W]; |
| 124 | |
| 125 | FILE *input_file; |
| 126 | |
| 127 | input_file = fopen(filename, "rb"); |
| 128 | if (!input_file) { |
| 129 | perror(filename); |
| 130 | return 1; |
| 131 | } |
| 132 | |
| 133 | if (fread(line, 1, 15, input_file) != 15) |
| 134 | return 1; |
| 135 | for (i = 0; i < H; i++) { |
| 136 | if (fread(line, 1, 3 * W, input_file) != 3 * W) |
| 137 | return 1; |
| 138 | for (j = 0; j < W; j++) { |
| 139 | tab_r[W * i + j] = line[3 * j ]; |
| 140 | tab_g[W * i + j] = line[3 * j + 1]; |
| 141 | tab_b[W * i + j] = line[3 * j + 2]; |
| 142 | } |
| 143 | } |
| 144 | fclose(input_file); |
| 145 | |
| 146 | /* tables sin/cos */ |
| 147 | for (i = 0; i < 360; i++) { |
| 148 | radian = 2 * i * MY_PI / 360; |
| 149 | h = 2 * FIXP + int_sin(radian); |
| 150 | h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP; |
| 151 | h_sin[i] = h * int_sin(radian) / 2 / FIXP; |
| 152 | } |
| 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | int main(int argc, char **argv) |
| 158 | { |
| 159 | int w, h, i; |
| 160 | char buf[1024]; |
| 161 | int isdir = 0; |
| 162 | |
| 163 | if (argc != 3) { |
| 164 | printf("usage: %s image.pnm file|dir\n" |
| 165 | "generate a test video stream\n", argv[0]); |
| 166 | return 1; |
| 167 | } |
| 168 | |
| 169 | if (!freopen(argv[2], "wb", stdout)) |
| 170 | isdir = 1; |
| 171 | |
| 172 | w = DEFAULT_WIDTH; |
| 173 | h = DEFAULT_HEIGHT; |
| 174 | |
| 175 | rgb_tab = malloc(w * h * 3); |
| 176 | wrap = w * 3; |
| 177 | width = w; |
| 178 | height = h; |
| 179 | |
| 180 | if (init_demo(argv[1])) |
| 181 | return 1; |
| 182 | |
| 183 | for (i = 0; i < DEFAULT_NB_PICT; i++) { |
| 184 | gen_image(i, w, h); |
| 185 | if (isdir) { |
| 186 | snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[2], i); |
| 187 | pgmyuv_save(buf, w, h, rgb_tab); |
| 188 | } else { |
| 189 | pgmyuv_save(NULL, w, h, rgb_tab); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | free(rgb_tab); |
| 194 | return 0; |
| 195 | } |