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306 lines
7.6 KiB
306 lines
7.6 KiB
/* |
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* Generates a synthetic YUV video sequence suitable for codec testing. |
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* |
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* copyright (c) Sebastien Bechet <s.bechet@av7.net> |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <inttypes.h> |
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#define FIXP (1 << 16) |
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#define MY_PI 205887 //(M_PI * FIX) |
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static int64_t int_pow(int64_t a, int p) |
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{ |
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int64_t v = FIXP; |
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for (; p; p--) { |
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v *= a; |
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v /= FIXP; |
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} |
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return v; |
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} |
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static int64_t int_sin(int64_t a) |
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{ |
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if (a < 0) |
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a = MY_PI - a; // 0..inf |
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a %= 2 * MY_PI; // 0..2PI |
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if (a >= MY_PI * 3 / 2) |
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a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2 |
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if (a >= MY_PI /2) |
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a = MY_PI - a; // -PI / 2 .. PI / 2 |
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return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040; |
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} |
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#define SCALEBITS 8 |
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#define ONE_HALF (1 << (SCALEBITS - 1)) |
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#define FIX(x) ((int) ((x) * (1L << SCALEBITS) + 0.5)) |
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static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb, |
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unsigned char *cr, unsigned char *src, |
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int width, int height) |
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{ |
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int wrap, wrap3, x, y; |
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int r, g, b, r1, g1, b1; |
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unsigned char *p; |
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wrap = width; |
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wrap3 = width * 3; |
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p = src; |
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for (y = 0; y < height; y += 2) { |
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for (x = 0; x < width; x += 2) { |
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r = p[0]; |
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g = p[1]; |
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b = p[2]; |
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r1 = r; |
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g1 = g; |
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b1 = b; |
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lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + |
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
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r = p[3]; |
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g = p[4]; |
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b = p[5]; |
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r1 += r; |
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g1 += g; |
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b1 += b; |
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lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + |
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
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p += wrap3; |
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lum += wrap; |
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r = p[0]; |
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g = p[1]; |
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b = p[2]; |
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r1 += r; |
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g1 += g; |
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b1 += b; |
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lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + |
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
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r = p[3]; |
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g = p[4]; |
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b = p[5]; |
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r1 += r; |
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g1 += g; |
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b1 += b; |
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lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + |
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FIX(0.11400) * b + ONE_HALF) >> SCALEBITS; |
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cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + |
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FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; |
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cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - |
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FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128; |
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cb++; |
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cr++; |
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p += -wrap3 + 2 * 3; |
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lum += -wrap + 2; |
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} |
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p += wrap3; |
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lum += wrap; |
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} |
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} |
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/* cif format */ |
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#define DEFAULT_WIDTH 352 |
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#define DEFAULT_HEIGHT 288 |
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#define DEFAULT_NB_PICT 50 |
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static void pgmyuv_save(const char *filename, int w, int h, |
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unsigned char *rgb_tab) |
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{ |
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FILE *f; |
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int i, h2, w2; |
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unsigned char *cb, *cr; |
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unsigned char *lum_tab, *cb_tab, *cr_tab; |
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lum_tab = malloc(w * h); |
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cb_tab = malloc(w * h / 4); |
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cr_tab = malloc(w * h / 4); |
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rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h); |
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f = fopen(filename, "wb"); |
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fprintf(f, "P5\n%d %d\n%d\n", w, h * 3 / 2, 255); |
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fwrite(lum_tab, 1, w * h, f); |
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h2 = h / 2; |
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w2 = w / 2; |
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cb = cb_tab; |
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cr = cr_tab; |
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for (i = 0; i < h2; i++) { |
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fwrite(cb, 1, w2, f); |
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fwrite(cr, 1, w2, f); |
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cb += w2; |
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cr += w2; |
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} |
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fclose(f); |
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free(lum_tab); |
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free(cb_tab); |
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free(cr_tab); |
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} |
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unsigned char *rgb_tab; |
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int width, height, wrap; |
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static void put_pixel(int x, int y, int r, int g, int b) |
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{ |
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unsigned char *p; |
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if (x < 0 || x >= width || |
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y < 0 || y >= height) |
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return; |
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p = rgb_tab + y * wrap + x * 3; |
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p[0] = r; |
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p[1] = g; |
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p[2] = b; |
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} |
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unsigned char tab_r[256 * 256]; |
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unsigned char tab_g[256 * 256]; |
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unsigned char tab_b[256 * 256]; |
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int h_cos [360]; |
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int h_sin [360]; |
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static int ipol(uint8_t *src, int x, int y) |
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{ |
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int int_x = x >> 16; |
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int int_y = y >> 16; |
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int frac_x = x & 0xFFFF; |
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int frac_y = y & 0xFFFF; |
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int s00 = src[( int_x & 255) + 256 * ( int_y & 255)]; |
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int s01 = src[((int_x + 1) & 255) + 256 * ( int_y & 255)]; |
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int s10 = src[( int_x & 255) + 256 * ((int_y + 1) & 255)]; |
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int s11 = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)]; |
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int s0 = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8; |
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int s1 = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8; |
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return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24; |
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} |
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static void gen_image(int num, int w, int h) |
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{ |
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const int c = h_cos [num % 360]; |
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const int s = h_sin [num % 360]; |
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const int xi = -(w / 2) * c; |
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const int yi = (w / 2) * s; |
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const int xj = -(h / 2) * s; |
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const int yj = -(h / 2) * c; |
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int i, j; |
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int x, y; |
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int xprime = xj; |
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int yprime = yj; |
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for (j = 0; j < h; j++) { |
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x = xprime + xi + FIXP * w / 2; |
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xprime += s; |
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y = yprime + yi + FIXP * h / 2; |
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yprime += c; |
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for (i = 0; i < w; i++ ) { |
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x += c; |
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y -= s; |
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put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y)); |
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} |
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} |
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} |
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#define W 256 |
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#define H 256 |
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static int init_demo(const char *filename) |
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{ |
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int i, j; |
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int h; |
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int radian; |
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char line[3 * W]; |
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FILE *input_file; |
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input_file = fopen(filename, "rb"); |
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if (!input_file) { |
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perror(filename); |
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return 1; |
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} |
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if (fread(line, 1, 15, input_file) != 15) |
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return 1; |
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for (i = 0; i < H; i++) { |
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if (fread(line, 1, 3 * W, input_file) != 3 * W) |
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return 1; |
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for (j = 0; j < W; j++) { |
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tab_r[W * i + j] = line[3 * j ]; |
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tab_g[W * i + j] = line[3 * j + 1]; |
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tab_b[W * i + j] = line[3 * j + 2]; |
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} |
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} |
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fclose(input_file); |
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/* tables sin/cos */ |
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for (i = 0; i < 360; i++) { |
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radian = 2 * i * MY_PI / 360; |
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h = 2 * FIXP + int_sin (radian); |
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h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP; |
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h_sin[i] = h * int_sin(radian) / 2 / FIXP; |
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} |
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return 0; |
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} |
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int main(int argc, char **argv) |
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{ |
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int w, h, i; |
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char buf[1024]; |
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if (argc != 3) { |
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printf("usage: %s directory/ image.pnm\n" |
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"generate a test video stream\n", argv[0]); |
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return 1; |
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} |
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w = DEFAULT_WIDTH; |
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h = DEFAULT_HEIGHT; |
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rgb_tab = malloc(w * h * 3); |
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wrap = w * 3; |
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width = w; |
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height = h; |
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if (init_demo(argv[2])) |
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return 1; |
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for (i = 0; i < DEFAULT_NB_PICT; i++) { |
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snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i); |
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gen_image(i, w, h); |
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pgmyuv_save(buf, w, h, rgb_tab); |
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} |
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free(rgb_tab); |
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return 0; |
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}
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