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 32static 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 44static 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 58static unsigned char tab_r[256 * 256]; 59static unsigned char tab_g[256 * 256]; 60static unsigned char tab_b[256 * 256]; 61 62static int h_cos[360]; 63static int h_sin[360]; 64 65static 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 81static 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 118static 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 157int 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} 196