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/*
* Generates a synthetic YUV video sequence suitable for codec testing.
* NOTE: no floats are used to guaranty a bit exact output.
*/
#include <stdlib.h>
#include <stdio.h>
#define SCALEBITS 8
#define ONE_HALF (1 << (SCALEBITS - 1))
#define FIX(x) ((int) ((x) * (1L<<SCALEBITS) + 0.5))
typedef unsigned char uint8_t;
static void rgb24_to_yuv420p(uint8_t *lum, uint8_t *cb, uint8_t *cr,
uint8_t *src, int width, int height)
{
int wrap, wrap3, x, y;
int r, g, b, r1, g1, b1;
uint8_t *p;
wrap = width;
wrap3 = width * 3;
p = src;
for(y=0;y<height;y+=2) {
for(x=0;x<width;x+=2) {
r = p[0];
g = p[1];
b = p[2];
r1 = r;
g1 = g;
b1 = b;
lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
r = p[3];
g = p[4];
b = p[5];
r1 += r;
g1 += g;
b1 += b;
lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
p += wrap3;
lum += wrap;
r = p[0];
g = p[1];
b = p[2];
r1 += r;
g1 += g;
b1 += b;
lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
r = p[3];
g = p[4];
b = p[5];
r1 += r;
g1 += g;
b1 += b;
lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
cb++;
cr++;
p += -wrap3 + 2 * 3;
lum += -wrap + 2;
}
p += wrap3;
lum += wrap;
}
}
/* cif format */
#define DEFAULT_WIDTH 352
#define DEFAULT_HEIGHT 288
#define DEFAULT_NB_PICT 50 /* 2 seconds */
void pgmyuv_save(const char *filename, int w, int h,
unsigned char *rgb_tab)
{
FILE *f;
int i, h2, w2;
unsigned char *cb, *cr;
unsigned char *lum_tab, *cb_tab, *cr_tab;
lum_tab = malloc(w * h);
cb_tab = malloc((w * h) / 4);
cr_tab = malloc((w * h) / 4);
rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);
f = fopen(filename,"wb");
fprintf(f, "P5\n%d %d\n%d\n", w, (h * 3) / 2, 255);
fwrite(lum_tab, 1, w * h, f);
h2 = h / 2;
w2 = w / 2;
cb = cb_tab;
cr = cr_tab;
for(i=0;i<h2;i++) {
fwrite(cb, 1, w2, f);
fwrite(cr, 1, w2, f);
cb += w2;
cr += w2;
}
fclose(f);
free(lum_tab);
free(cb_tab);
free(cr_tab);
}
unsigned char *rgb_tab;
int width, height, wrap;
void put_pixel(int x, int y, int r, int g, int b)
{
unsigned char *p;
if (x < 0 || x >= width ||
y < 0 || y >= height)
return;
p = rgb_tab + y * wrap + x * 3;
p[0] = r;
p[1] = g;
p[2] = b;
}
static unsigned int myrnd(unsigned int *seed_ptr, int n)
{
unsigned int seed, val;
seed = *seed_ptr;
seed = (seed * 314159) + 1;
if (n == 256) {
val = seed >> 24;
} else {
val = seed % n;
}
*seed_ptr = seed;
return val;
}
#define NOISE_X 10
#define NOISE_Y 30
#define NOISE_W 26
#define FRAC_BITS 8
#define FRAC_ONE (1 << FRAC_BITS)
/* cosine approximate with 1-x^2 */
int int_cos(int a)
{
int v, neg;
a = a & (FRAC_ONE - 1);
if (a >= (FRAC_ONE / 2))
a = FRAC_ONE - a;
neg = 0;
if (a > (FRAC_ONE / 4)) {
neg = -1;
a = (FRAC_ONE / 2) - a;
}
v = FRAC_ONE - ((a * a) >> 4);
v = (v ^ neg) - neg;
return v;
}
#define NB_OBJS 10
typedef struct VObj {
int x, y, w, h;
int r, g, b;
} VObj;
VObj objs[NB_OBJS];
unsigned int seed = 1;
void gen_image(int num, int w, int h)
{
int r, g, b, x, y, i, dx, dy, x1, y1;
unsigned int seed1;
if (num == 0) {
for(i=0;i<NB_OBJS;i++) {
objs[i].x = myrnd(&seed, w);
objs[i].y = myrnd(&seed, h);
objs[i].w = myrnd(&seed, w / 4) + 10;
objs[i].h = myrnd(&seed, h / 4) + 10;
objs[i].r = myrnd(&seed, 256);
objs[i].g = myrnd(&seed, 256);
objs[i].b = myrnd(&seed, 256);
}
}
/* first a moving background with gradients */
/* test motion estimation */
dx = int_cos(num * FRAC_ONE / 50) * 35;
dy = int_cos(num * FRAC_ONE / 50 + FRAC_ONE / 10) * 30;
for(y=0;y<h;y++) {
for(x=0;x<w;x++) {
x1 = (x << FRAC_BITS) + dx;
y1 = (y << FRAC_BITS) + dx;
r = ((y1 * 7) >> FRAC_BITS) & 0xff;
g = (((x1 + y1) * 9) >> FRAC_BITS) & 0xff;
b = ((x1 * 5) >> FRAC_BITS) & 0xff;
put_pixel(x, y, r, g, b);
}
}
/* then some noise with very high intensity to test saturation */
seed1 = num;
for(y=0;y<NOISE_W;y++) {
for(x=0;x<NOISE_W;x++) {
r = myrnd(&seed1, 256);
g = myrnd(&seed1, 256);
b = myrnd(&seed1, 256);
put_pixel(x + NOISE_X, y + NOISE_Y, r, g, b);
}
}
/* then moving objects */
for(i=0;i<NB_OBJS;i++) {
VObj *p = &objs[i];
seed1 = i;
for(y=0;y<p->h;y++) {
for(x=0;x<p->w;x++) {
r = p->r;
g = p->g;
b = p->b;
/* add a per object noise */
r += myrnd(&seed1, 50);
g += myrnd(&seed1, 50);
b += myrnd(&seed1, 50);
put_pixel(x + p->x, y + p->y, r, g, b);
}
}
p->x += myrnd(&seed, 21) - 10;
p->y += myrnd(&seed, 21) - 10;
}
}
int main(int argc, char **argv)
{
int w, h, i;
char buf[1024];
if (argc != 2) {
printf("usage: %s file\n"
"generate a test video stream\n", argv[0]);
exit(1);
}
#if 0
for(i=0;i<256;i++)
printf("cos(%d)=%d\n", i, int_cos(i));
#endif
w = DEFAULT_WIDTH;
h = DEFAULT_HEIGHT;
rgb_tab = malloc(w * h * 3);
wrap = w * 3;
width = w;
height = h;
for(i=0;i<DEFAULT_NB_PICT;i++) {
snprintf(buf, sizeof(buf), "%s%d.pgm", argv[1], i);
gen_image(i, w, h);
pgmyuv_save(buf, w, h, rgb_tab);
}
free(rgb_tab);
return 0;
}
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