tests/videogen.c - vendor/opensource/ffmpeg - Git at Google

 /*
  * Generates a synthetic YUV video sequence suitable for codec testing.
  * NOTE: No floats are used to guarantee a bit exact output.
  *
  * Copyright (c) 2002 Fabrice Bellard
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>

 #define SCALEBITS 8
 #define ONE_HALF  (1 << (SCALEBITS - 1))
 #define FIX(x)    ((int) ((x) * (1L<<SCALEBITS) + 0.5))

 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 */

 static 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;

 static 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 */
 static 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;

 static 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%02d.pgm", argv[1], i);
         gen_image(i, w, h);
         pgmyuv_save(buf, w, h, rgb_tab);
     }

     free(rgb_tab);
     return 0;
 }
	/*
	* Generates a synthetic YUV video sequence suitable for codec testing.
	* NOTE: No floats are used to guarantee a bit exact output.
	*
	* Copyright (c) 2002 Fabrice Bellard
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <stdlib.h>
	#include <stdint.h>
	#include <stdio.h>

	#define SCALEBITS 8
	#define ONE_HALF (1 << (SCALEBITS - 1))
	#define FIX(x) ((int) ((x) * (1L<<SCALEBITS) + 0.5))

	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 */

	static 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;

	static 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 */
	static 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;

	static 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%02d.pgm", argv[1], i);
	gen_image(i, w, h);
	pgmyuv_save(buf, w, h, rgb_tab);
	}

	free(rgb_tab);
	return 0;
	}