2 * Generates a synthetic YUV video sequence suitable for codec testing.
3 * NOTE: no floats are used to guaranty a bit exact output.
9 #define ONE_HALF (1 << (SCALEBITS - 1))
10 #define FIX(x) ((int) ((x) * (1L<<SCALEBITS) + 0.5))
11 typedef unsigned char uint8_t;
13 static void rgb24_to_yuv420p(uint8_t *lum, uint8_t *cb, uint8_t *cr,
14 uint8_t *src, int width, int height)
16 int wrap, wrap3, x, y;
17 int r, g, b, r1, g1, b1;
23 for(y=0;y<height;y+=2) {
24 for(x=0;x<width;x+=2) {
31 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
32 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
39 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
40 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
50 lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
51 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
58 lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
59 FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
61 cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
62 FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
63 cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
64 FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
77 #define DEFAULT_WIDTH 352
78 #define DEFAULT_HEIGHT 288
79 #define DEFAULT_NB_PICT 50 /* 2 seconds */
81 void pgmyuv_save(const char *filename, int w, int h,
82 unsigned char *rgb_tab)
86 unsigned char *cb, *cr;
87 unsigned char *lum_tab, *cb_tab, *cr_tab;
89 lum_tab = malloc(w * h);
90 cb_tab = malloc((w * h) / 4);
91 cr_tab = malloc((w * h) / 4);
93 rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
95 f = fopen(filename,"wb");
96 fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
97 fwrite(lum_tab, 1, w * h, f);
103 fwrite(cb, 1, w2, f);
104 fwrite(cr, 1, w2, f);
115 unsigned char *rgb_tab;
116 int width, height, wrap;
118 void put_pixel(int x, int y, int r, int g, int b)
122 if (x < 0 || x >= width ||
123 y < 0 || y >= height)
126 p = rgb_tab + y * wrap + x * 3;
132 static unsigned int myrnd(unsigned int *seed_ptr, int n)
134 unsigned int seed, val;
137 seed = (seed * 314159) + 1;
152 #define FRAC_ONE (1 << FRAC_BITS)
154 /* cosine approximate with 1-x^2 */
158 a = a & (FRAC_ONE - 1);
159 if (a >= (FRAC_ONE / 2))
162 if (a > (FRAC_ONE / 4)) {
164 a = (FRAC_ONE / 2) - a;
166 v = FRAC_ONE - ((a * a) >> 4);
173 typedef struct VObj {
180 unsigned int seed = 1;
182 void gen_image(int num, int w, int h)
184 int r, g, b, x, y, i, dx, dy, x1, y1;
188 for(i=0;i<NB_OBJS;i++) {
189 objs[i].x = myrnd(&seed, w);
190 objs[i].y = myrnd(&seed, h);
191 objs[i].w = myrnd(&seed, w / 4) + 10;
192 objs[i].h = myrnd(&seed, h / 4) + 10;
193 objs[i].r = myrnd(&seed, 256);
194 objs[i].g = myrnd(&seed, 256);
195 objs[i].b = myrnd(&seed, 256);
199 /* first a moving background with gradients */
200 /* test motion estimation */
201 dx = int_cos(num * FRAC_ONE / 50) * 35;
202 dy = int_cos(num * FRAC_ONE / 50 + FRAC_ONE / 10) * 30;
205 x1 = (x << FRAC_BITS) + dx;
206 y1 = (y << FRAC_BITS) + dx;
207 r = ((y1 * 7) >> FRAC_BITS) & 0xff;
208 g = (((x1 + y1) * 9) >> FRAC_BITS) & 0xff;
209 b = ((x1 * 5) >> FRAC_BITS) & 0xff;
210 put_pixel(x, y, r, g, b);
214 /* then some noise with very high intensity to test saturation */
216 for(y=0;y<NOISE_W;y++) {
217 for(x=0;x<NOISE_W;x++) {
218 r = myrnd(&seed1, 256);
219 g = myrnd(&seed1, 256);
220 b = myrnd(&seed1, 256);
221 put_pixel(x + NOISE_X, y + NOISE_Y, r, g, b);
225 /* then moving objects */
226 for(i=0;i<NB_OBJS;i++) {
229 for(y=0;y<p->h;y++) {
230 for(x=0;x<p->w;x++) {
234 /* add a per object noise */
235 r += myrnd(&seed1, 50);
236 g += myrnd(&seed1, 50);
237 b += myrnd(&seed1, 50);
238 put_pixel(x + p->x, y + p->y, r, g, b);
241 p->x += myrnd(&seed, 21) - 10;
242 p->y += myrnd(&seed, 21) - 10;
246 int main(int argc, char **argv)
252 printf("usage: %s file\n"
253 "generate a test video stream\n", argv[0]);
259 printf("cos(%d)=%d\n", i, int_cos(i));
265 rgb_tab = malloc(w * h * 3);
270 for(i=0;i<DEFAULT_NB_PICT;i++) {
271 snprintf(buf, sizeof(buf), "%s%d.pgm", argv[1], i);
273 pgmyuv_save(buf, w, h, rgb_tab);