| /* |
| * 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) + dy; |
| 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); |
| } |
| |
| 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; |
| } |