/* * Generate a synthetic YUV video sequence suitable for codec testing. * * copyright (c) Sebastien Bechet <s.bechet@av7.net> * * 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 <stdlib.h> #include <stdio.h> #include <inttypes.h> #include "utils.c" #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; } static unsigned char tab_r[256 * 256]; static unsigned char tab_g[256 * 256]; static unsigned char tab_b[256 * 256]; static int h_cos[360]; static 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]; int isdir = 0; if (argc != 3) { printf("usage: %s image.pnm file|dir\n" "generate a test video stream\n", argv[0]); return 1; } if (!freopen(argv[2], "wb", stdout)) isdir = 1; w = DEFAULT_WIDTH; h = DEFAULT_HEIGHT; rgb_tab = malloc(w * h * 3); wrap = w * 3; width = w; height = h; if (init_demo(argv[1])) return 1; for (i = 0; i < DEFAULT_NB_PICT; i++) { gen_image(i, w, h); if (isdir) { snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[2], i); pgmyuv_save(buf, w, h, rgb_tab); } else { pgmyuv_save(NULL, w, h, rgb_tab); } } free(rgb_tab); return 0; }