/* * Generates a synthetic YUV video sequence suitable for codec testing. * * copyright (c) Sebastien Bechet * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #define FIXP (1 << 16) #define MY_PI 205887 //(M_PI * FIX) static int64_t int_pow(int64_t a, int p) { int64_t v = FIXP; for (; p; p--) { v *= a; v /= FIXP; } return v; } static int64_t int_sin(int64_t a) { if (a < 0) a = MY_PI - a; // 0..inf a %= 2 * MY_PI; // 0..2PI if (a >= MY_PI * 3 / 2) a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2 if (a >= MY_PI /2) a = MY_PI - a; // -PI / 2 .. PI / 2 return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040; } #define SCALEBITS 8 #define ONE_HALF (1 << (SCALEBITS - 1)) #define FIX(x) ((int) ((x) * (1L << SCALEBITS) + 0.5)) static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb, unsigned char *cr, unsigned char *src, int width, int height) { int wrap, wrap3, x, y; int r, g, b, r1, g1, b1; unsigned char *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 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; } unsigned char tab_r[256 * 256]; unsigned char tab_g[256 * 256]; unsigned char tab_b[256 * 256]; int h_cos [360]; int h_sin [360]; static int ipol(uint8_t *src, int x, int y) { int int_x = x >> 16; int int_y = y >> 16; int frac_x = x & 0xFFFF; int frac_y = y & 0xFFFF; int s00 = src[( int_x & 255) + 256 * ( int_y & 255)]; int s01 = src[((int_x + 1) & 255) + 256 * ( int_y & 255)]; int s10 = src[( int_x & 255) + 256 * ((int_y + 1) & 255)]; int s11 = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)]; int s0 = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8; int s1 = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8; return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24; } static void gen_image(int num, int w, int h) { const int c = h_cos [num % 360]; const int s = h_sin [num % 360]; const int xi = -(w / 2) * c; const int yi = (w / 2) * s; const int xj = -(h / 2) * s; const int yj = -(h / 2) * c; int i, j; int x, y; int xprime = xj; int yprime = yj; for (j = 0; j < h; j++) { x = xprime + xi + FIXP * w / 2; xprime += s; y = yprime + yi + FIXP * h / 2; yprime += c; for (i = 0; i < w; i++ ) { x += c; y -= s; put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y)); } } } #define W 256 #define H 256 static int init_demo(const char *filename) { int i, j; int h; int radian; char line[3 * W]; FILE *input_file; input_file = fopen(filename, "rb"); if (!input_file) { perror(filename); return 1; } if (fread(line, 1, 15, input_file) != 15) return 1; for (i = 0; i < H; i++) { if (fread(line, 1, 3 * W, input_file) != 3 * W) return 1; for (j = 0; j < W; j++) { tab_r[W * i + j] = line[3 * j ]; tab_g[W * i + j] = line[3 * j + 1]; tab_b[W * i + j] = line[3 * j + 2]; } } fclose(input_file); /* tables sin/cos */ for (i = 0; i < 360; i++) { radian = 2 * i * MY_PI / 360; h = 2 * FIXP + int_sin (radian); h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP; h_sin[i] = h * int_sin(radian) / 2 / FIXP; } return 0; } int main(int argc, char **argv) { int w, h, i; char buf[1024]; if (argc != 3) { printf("usage: %s directory/ image.pnm\n" "generate a test video stream\n", argv[0]); return 1; } w = DEFAULT_WIDTH; h = DEFAULT_HEIGHT; rgb_tab = malloc(w * h * 3); wrap = w * 3; width = w; height = h; if (init_demo(argv[2])) return 1; 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; }