2 * Generates a synthetic YUV video sequence suitable for codec testing.
4 * rotozoom.c -> s.bechet@av7.net
11 #define MY_PI 205887 //(M_PI*FIX)
13 static int64_t int_pow(int64_t a, int p){
24 static int64_t int_sin(int64_t a){
25 if(a<0) a= MY_PI-a; // 0..inf
26 a %= 2*MY_PI; // 0..2PI
28 if(a>=MY_PI*3/2) a -= 2*MY_PI; // -PI/2 .. 3PI/2
29 if(a>=MY_PI/2 ) a = MY_PI - a; // -PI/2 .. PI/2
31 return a - int_pow(a, 3)/6 + int_pow(a, 5)/120 - int_pow(a, 7)/5040;
35 #define ONE_HALF (1 << (SCALEBITS - 1))
36 #define FIX(x) ((int) ((x) * (1L<<SCALEBITS) + 0.5))
37 typedef unsigned char UINT8;
39 static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
40 UINT8 *src, int width, int height)
42 int wrap, wrap3, x, y;
43 int r, g, b, r1, g1, b1;
49 for(y=0;y<height;y+=2) {
50 for(x=0;x<width;x+=2) {
57 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
58 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
65 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
66 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
76 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
77 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
84 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
85 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
87 cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
88 FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
89 cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
90 FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
103 #define DEFAULT_WIDTH 352
104 #define DEFAULT_HEIGHT 288
105 #define DEFAULT_NB_PICT 50
107 void pgmyuv_save(const char *filename, int w, int h,
108 unsigned char *rgb_tab)
112 unsigned char *cb, *cr;
113 unsigned char *lum_tab, *cb_tab, *cr_tab;
115 lum_tab = malloc(w * h);
116 cb_tab = malloc((w * h) / 4);
117 cr_tab = malloc((w * h) / 4);
119 rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
121 f = fopen(filename,"w");
122 fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
123 fwrite(lum_tab, 1, w * h, f);
129 fwrite(cb, 1, w2, f);
130 fwrite(cr, 1, w2, f);
141 unsigned char *rgb_tab;
142 int width, height, wrap;
144 void put_pixel(int x, int y, int r, int g, int b)
148 if (x < 0 || x >= width ||
149 y < 0 || y >= height)
152 p = rgb_tab + y * wrap + x * 3;
158 unsigned char tab_r[256*256];
159 unsigned char tab_g[256*256];
160 unsigned char tab_b[256*256];
166 static int ipol(uint8_t *src, int x, int y){
169 int frac_x= x&0xFFFF;
170 int frac_y= y&0xFFFF;
171 int s00= src[ ( int_x &255) + 256*( int_y &255) ];
172 int s01= src[ ((int_x+1)&255) + 256*( int_y &255) ];
173 int s10= src[ ( int_x &255) + 256*((int_y+1)&255) ];
174 int s11= src[ ((int_x+1)&255) + 256*((int_y+1)&255) ];
175 int s0= (((1<<16) - frac_x)*s00 + frac_x*s01)>>8;
176 int s1= (((1<<16) - frac_x)*s10 + frac_x*s11)>>8;
178 return (((1<<16) - frac_y)*s0 + frac_y*s1)>>24;
181 void gen_image(int num, int w, int h)
183 const int c = h_cos [teta];
184 const int s = h_sin [teta];
186 const int xi = -(w/2) * c;
187 const int yi = (w/2) * s;
189 const int xj = -(h/2) * s;
190 const int yj = -(h/2) * c;
200 x = xprime + xi + FIXP*w/2;
203 y = yprime + yi + FIXP*h/2;
206 for ( i=0 ; i<w ; i++ ) {
210 put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y));
214 dep = ((x>>16)&255) + (((y>>16)&255)<<8);
215 put_pixel(i, j, tab_r[dep], tab_g[dep], tab_b[dep]);
220 teta = (teta+1) % 360;
226 void init_demo(const char *filename) {
234 fichier = fopen(filename,"r");
240 fread(line, 1, 15, fichier);
242 fread(line,1,3*W,fichier);
244 tab_r[W*i+j] = line[3*j ];
245 tab_g[W*i+j] = line[3*j + 1];
246 tab_b[W*i+j] = line[3*j + 2];
252 for (i=0;i<360;i++) {
253 radian = 2*i*MY_PI/360;
254 h = 2*FIXP + int_sin (radian);
255 h_cos[i] = ( h * int_sin (radian + MY_PI/2) )/2/FIXP;
256 h_sin[i] = ( h * int_sin (radian ) )/2/FIXP;
260 int main(int argc, char **argv)
266 printf("usage: %s directory/ image.pnm\n"
267 "generate a test video stream\n", argv[0]);
274 rgb_tab = malloc(w * h * 3);
281 for(i=0;i<DEFAULT_NB_PICT;i++) {
282 snprintf(buf, sizeof(buf), "%s%d.pgm", argv[1], i);
284 pgmyuv_save(buf, w, h, rgb_tab);