Libav 0.7.1
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00001 /* 00002 * Generates a synthetic YUV video sequence suitable for codec testing. 00003 * 00004 * copyright (c) Sebastien Bechet <s.bechet@av7.net> 00005 * 00006 * This file is part of Libav. 00007 * 00008 * Libav is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU Lesser General Public 00010 * License as published by the Free Software Foundation; either 00011 * version 2.1 of the License, or (at your option) any later version. 00012 * 00013 * Libav is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00016 * Lesser General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU Lesser General Public 00019 * License along with Libav; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00023 #include <stdlib.h> 00024 #include <stdio.h> 00025 #include <inttypes.h> 00026 00027 #define FIXP (1 << 16) 00028 #define MY_PI 205887 //(M_PI * FIX) 00029 00030 static int64_t int_pow(int64_t a, int p) 00031 { 00032 int64_t v = FIXP; 00033 00034 for (; p; p--) { 00035 v *= a; 00036 v /= FIXP; 00037 } 00038 00039 return v; 00040 } 00041 00042 static int64_t int_sin(int64_t a) 00043 { 00044 if (a < 0) 00045 a = MY_PI - a; // 0..inf 00046 a %= 2 * MY_PI; // 0..2PI 00047 00048 if (a >= MY_PI * 3 / 2) 00049 a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2 00050 if (a >= MY_PI /2) 00051 a = MY_PI - a; // -PI / 2 .. PI / 2 00052 00053 return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040; 00054 } 00055 00056 #define SCALEBITS 8 00057 #define ONE_HALF (1 << (SCALEBITS - 1)) 00058 #define FIX(x) ((int) ((x) * (1L << SCALEBITS) + 0.5)) 00059 00060 static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb, 00061 unsigned char *cr, unsigned char *src, 00062 int width, int height) 00063 { 00064 int wrap, wrap3, x, y; 00065 int r, g, b, r1, g1, b1; 00066 unsigned char *p; 00067 00068 wrap = width; 00069 wrap3 = width * 3; 00070 p = src; 00071 for (y = 0; y < height; y += 2) { 00072 for (x = 0; x < width; x += 2) { 00073 r = p[0]; 00074 g = p[1]; 00075 b = p[2]; 00076 r1 = r; 00077 g1 = g; 00078 b1 = b; 00079 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 00080 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; 00081 r = p[3]; 00082 g = p[4]; 00083 b = p[5]; 00084 r1 += r; 00085 g1 += g; 00086 b1 += b; 00087 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 00088 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; 00089 p += wrap3; 00090 lum += wrap; 00091 00092 r = p[0]; 00093 g = p[1]; 00094 b = p[2]; 00095 r1 += r; 00096 g1 += g; 00097 b1 += b; 00098 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 00099 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; 00100 r = p[3]; 00101 g = p[4]; 00102 b = p[5]; 00103 r1 += r; 00104 g1 += g; 00105 b1 += b; 00106 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 00107 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; 00108 00109 cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 00110 FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; 00111 cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 00112 FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; 00113 00114 cb++; 00115 cr++; 00116 p += -wrap3 + 2 * 3; 00117 lum += -wrap + 2; 00118 } 00119 p += wrap3; 00120 lum += wrap; 00121 } 00122 } 00123 00124 /* cif format */ 00125 #define DEFAULT_WIDTH 352 00126 #define DEFAULT_HEIGHT 288 00127 #define DEFAULT_NB_PICT 50 00128 00129 static void pgmyuv_save(const char *filename, int w, int h, 00130 unsigned char *rgb_tab) 00131 { 00132 FILE *f; 00133 int i, h2, w2; 00134 unsigned char *cb, *cr; 00135 unsigned char *lum_tab, *cb_tab, *cr_tab; 00136 00137 lum_tab = malloc(w * h); 00138 cb_tab = malloc(w * h / 4); 00139 cr_tab = malloc(w * h / 4); 00140 00141 rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h); 00142 00143 f = fopen(filename, "wb"); 00144 fprintf(f, "P5\n%d %d\n%d\n", w, h * 3 / 2, 255); 00145 fwrite(lum_tab, 1, w * h, f); 00146 h2 = h / 2; 00147 w2 = w / 2; 00148 cb = cb_tab; 00149 cr = cr_tab; 00150 for (i = 0; i < h2; i++) { 00151 fwrite(cb, 1, w2, f); 00152 fwrite(cr, 1, w2, f); 00153 cb += w2; 00154 cr += w2; 00155 } 00156 fclose(f); 00157 00158 free(lum_tab); 00159 free(cb_tab); 00160 free(cr_tab); 00161 } 00162 00163 unsigned char *rgb_tab; 00164 int width, height, wrap; 00165 00166 static void put_pixel(int x, int y, int r, int g, int b) 00167 { 00168 unsigned char *p; 00169 00170 if (x < 0 || x >= width || 00171 y < 0 || y >= height) 00172 return; 00173 00174 p = rgb_tab + y * wrap + x * 3; 00175 p[0] = r; 00176 p[1] = g; 00177 p[2] = b; 00178 } 00179 00180 unsigned char tab_r[256 * 256]; 00181 unsigned char tab_g[256 * 256]; 00182 unsigned char tab_b[256 * 256]; 00183 00184 int h_cos [360]; 00185 int h_sin [360]; 00186 00187 static int ipol(uint8_t *src, int x, int y) 00188 { 00189 int int_x = x >> 16; 00190 int int_y = y >> 16; 00191 int frac_x = x & 0xFFFF; 00192 int frac_y = y & 0xFFFF; 00193 int s00 = src[( int_x & 255) + 256 * ( int_y & 255)]; 00194 int s01 = src[((int_x + 1) & 255) + 256 * ( int_y & 255)]; 00195 int s10 = src[( int_x & 255) + 256 * ((int_y + 1) & 255)]; 00196 int s11 = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)]; 00197 int s0 = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8; 00198 int s1 = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8; 00199 00200 return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24; 00201 } 00202 00203 static void gen_image(int num, int w, int h) 00204 { 00205 const int c = h_cos [num % 360]; 00206 const int s = h_sin [num % 360]; 00207 00208 const int xi = -(w / 2) * c; 00209 const int yi = (w / 2) * s; 00210 00211 const int xj = -(h / 2) * s; 00212 const int yj = -(h / 2) * c; 00213 int i, j; 00214 00215 int x, y; 00216 int xprime = xj; 00217 int yprime = yj; 00218 00219 for (j = 0; j < h; j++) { 00220 x = xprime + xi + FIXP * w / 2; 00221 xprime += s; 00222 00223 y = yprime + yi + FIXP * h / 2; 00224 yprime += c; 00225 00226 for (i = 0; i < w; i++ ) { 00227 x += c; 00228 y -= s; 00229 put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y)); 00230 } 00231 } 00232 } 00233 00234 #define W 256 00235 #define H 256 00236 00237 static int init_demo(const char *filename) 00238 { 00239 int i, j; 00240 int h; 00241 int radian; 00242 char line[3 * W]; 00243 00244 FILE *input_file; 00245 00246 input_file = fopen(filename, "rb"); 00247 if (!input_file) { 00248 perror(filename); 00249 return 1; 00250 } 00251 00252 if (fread(line, 1, 15, input_file) != 15) 00253 return 1; 00254 for (i = 0; i < H; i++) { 00255 if (fread(line, 1, 3 * W, input_file) != 3 * W) 00256 return 1; 00257 for (j = 0; j < W; j++) { 00258 tab_r[W * i + j] = line[3 * j ]; 00259 tab_g[W * i + j] = line[3 * j + 1]; 00260 tab_b[W * i + j] = line[3 * j + 2]; 00261 } 00262 } 00263 fclose(input_file); 00264 00265 /* tables sin/cos */ 00266 for (i = 0; i < 360; i++) { 00267 radian = 2 * i * MY_PI / 360; 00268 h = 2 * FIXP + int_sin (radian); 00269 h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP; 00270 h_sin[i] = h * int_sin(radian) / 2 / FIXP; 00271 } 00272 00273 return 0; 00274 } 00275 00276 int main(int argc, char **argv) 00277 { 00278 int w, h, i; 00279 char buf[1024]; 00280 00281 if (argc != 3) { 00282 printf("usage: %s directory/ image.pnm\n" 00283 "generate a test video stream\n", argv[0]); 00284 return 1; 00285 } 00286 00287 w = DEFAULT_WIDTH; 00288 h = DEFAULT_HEIGHT; 00289 00290 rgb_tab = malloc(w * h * 3); 00291 wrap = w * 3; 00292 width = w; 00293 height = h; 00294 00295 if (init_demo(argv[2])) 00296 return 1; 00297 00298 for (i = 0; i < DEFAULT_NB_PICT; i++) { 00299 snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i); 00300 gen_image(i, w, h); 00301 pgmyuv_save(buf, w, h, rgb_tab); 00302 } 00303 00304 free(rgb_tab); 00305 return 0; 00306 }