| 1 | /* |
| 2 | * Generate a synthetic YUV video sequence suitable for codec testing. |
| 3 | * NOTE: No floats are used to guarantee bitexact output. |
| 4 | * |
| 5 | * Copyright (c) 2002 Fabrice Bellard |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | #include <stdlib.h> |
| 25 | #include <stdint.h> |
| 26 | #include <stdio.h> |
| 27 | |
| 28 | #include "utils.c" |
| 29 | |
| 30 | static unsigned int myrnd(unsigned int *seed_ptr, int n) |
| 31 | { |
| 32 | unsigned int seed, val; |
| 33 | |
| 34 | seed = *seed_ptr; |
| 35 | seed = (seed * 314159) + 1; |
| 36 | if (n == 256) { |
| 37 | val = seed >> 24; |
| 38 | } else { |
| 39 | val = seed % n; |
| 40 | } |
| 41 | *seed_ptr = seed; |
| 42 | return val; |
| 43 | } |
| 44 | |
| 45 | #define NOISE_X 10 |
| 46 | #define NOISE_Y 30 |
| 47 | #define NOISE_W 26 |
| 48 | |
| 49 | #define FRAC_BITS 8 |
| 50 | #define FRAC_ONE (1 << FRAC_BITS) |
| 51 | |
| 52 | /* cosine approximate with 1-x^2 */ |
| 53 | static int int_cos(int a) |
| 54 | { |
| 55 | int v, neg; |
| 56 | a = a & (FRAC_ONE - 1); |
| 57 | if (a >= (FRAC_ONE / 2)) |
| 58 | a = FRAC_ONE - a; |
| 59 | neg = 0; |
| 60 | if (a > (FRAC_ONE / 4)) { |
| 61 | neg = -1; |
| 62 | a = (FRAC_ONE / 2) - a; |
| 63 | } |
| 64 | v = FRAC_ONE - ((a * a) >> 4); |
| 65 | v = (v ^ neg) - neg; |
| 66 | return v; |
| 67 | } |
| 68 | |
| 69 | #define NB_OBJS 10 |
| 70 | |
| 71 | typedef struct VObj { |
| 72 | int x, y, w, h; |
| 73 | int r, g, b; |
| 74 | } VObj; |
| 75 | |
| 76 | static VObj objs[NB_OBJS]; |
| 77 | |
| 78 | static unsigned int seed = 1; |
| 79 | |
| 80 | static void gen_image(int num, int w, int h) |
| 81 | { |
| 82 | int r, g, b, x, y, i, dx, dy, x1, y1; |
| 83 | unsigned int seed1; |
| 84 | |
| 85 | if (num == 0) { |
| 86 | for (i = 0; i < NB_OBJS; i++) { |
| 87 | objs[i].x = myrnd(&seed, w); |
| 88 | objs[i].y = myrnd(&seed, h); |
| 89 | objs[i].w = myrnd(&seed, w / 4) + 10; |
| 90 | objs[i].h = myrnd(&seed, h / 4) + 10; |
| 91 | objs[i].r = myrnd(&seed, 256); |
| 92 | objs[i].g = myrnd(&seed, 256); |
| 93 | objs[i].b = myrnd(&seed, 256); |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | /* first a moving background with gradients */ |
| 98 | /* test motion estimation */ |
| 99 | dx = int_cos(num * FRAC_ONE / 50) * 35; |
| 100 | dy = int_cos(num * FRAC_ONE / 50 + FRAC_ONE / 10) * 30; |
| 101 | for (y = 0; y < h; y++) { |
| 102 | for (x = 0; x < w; x++) { |
| 103 | x1 = (x << FRAC_BITS) + dx; |
| 104 | y1 = (y << FRAC_BITS) + dy; |
| 105 | r = ((y1 * 7) >> FRAC_BITS) & 0xff; |
| 106 | g = (((x1 + y1) * 9) >> FRAC_BITS) & 0xff; |
| 107 | b = ((x1 * 5) >> FRAC_BITS) & 0xff; |
| 108 | put_pixel(x, y, r, g, b); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /* then some noise with very high intensity to test saturation */ |
| 113 | seed1 = num; |
| 114 | for (y = 0; y < NOISE_W; y++) { |
| 115 | for (x = 0; x < NOISE_W; x++) { |
| 116 | r = myrnd(&seed1, 256); |
| 117 | g = myrnd(&seed1, 256); |
| 118 | b = myrnd(&seed1, 256); |
| 119 | put_pixel(x + NOISE_X, y + NOISE_Y, r, g, b); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /* then moving objects */ |
| 124 | for (i = 0; i < NB_OBJS; i++) { |
| 125 | VObj *p = &objs[i]; |
| 126 | seed1 = i; |
| 127 | for (y = 0; y < p->h; y++) { |
| 128 | for (x = 0; x < p->w; x++) { |
| 129 | r = p->r; |
| 130 | g = p->g; |
| 131 | b = p->b; |
| 132 | /* add a per object noise */ |
| 133 | r += myrnd(&seed1, 50); |
| 134 | g += myrnd(&seed1, 50); |
| 135 | b += myrnd(&seed1, 50); |
| 136 | put_pixel(x + p->x, y + p->y, r, g, b); |
| 137 | } |
| 138 | } |
| 139 | p->x += myrnd(&seed, 21) - 10; |
| 140 | p->y += myrnd(&seed, 21) - 10; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | void print_help(const char* name) |
| 145 | { |
| 146 | printf("usage: %s file|dir [w=%i] [h=%i]\n" |
| 147 | "generate a test video stream\n", |
| 148 | name, DEFAULT_WIDTH, DEFAULT_HEIGHT); |
| 149 | exit(1); |
| 150 | } |
| 151 | |
| 152 | int main(int argc, char **argv) |
| 153 | { |
| 154 | int w, h, i; |
| 155 | char buf[1024]; |
| 156 | int isdir = 0; |
| 157 | |
| 158 | if (argc < 2 || argc > 4) { |
| 159 | print_help(argv[0]); |
| 160 | } |
| 161 | |
| 162 | if (!freopen(argv[1], "wb", stdout)) |
| 163 | isdir = 1; |
| 164 | |
| 165 | w = DEFAULT_WIDTH; |
| 166 | if(argc > 2) { |
| 167 | w = atoi(argv[2]); |
| 168 | if (w < 1) print_help(argv[0]); |
| 169 | } |
| 170 | h = DEFAULT_HEIGHT; |
| 171 | if(argc > 3) { |
| 172 | h = atoi(argv[3]); |
| 173 | if (h < 1) print_help(argv[0]); |
| 174 | } |
| 175 | |
| 176 | rgb_tab = malloc(w * h * 3); |
| 177 | wrap = w * 3; |
| 178 | width = w; |
| 179 | height = h; |
| 180 | |
| 181 | for (i = 0; i < DEFAULT_NB_PICT; i++) { |
| 182 | gen_image(i, w, h); |
| 183 | if (isdir) { |
| 184 | snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i); |
| 185 | pgmyuv_save(buf, w, h, rgb_tab); |
| 186 | } else { |
| 187 | pgmyuv_save(NULL, w, h, rgb_tab); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | free(rgb_tab); |
| 192 | return 0; |
| 193 | } |