| /* |
| * Generate a synthetic YUV video sequence suitable for codec testing. |
| * |
| * copyright (c) Sebastien Bechet <s.bechet@av7.net> |
| * |
| * 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 <stdio.h> |
| #include <inttypes.h> |
| |
| #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; |
| } |