mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
290 lines
6.4 KiB
C
290 lines
6.4 KiB
C
/*
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* Generates a synthetic YUV video sequence suitable for codec testing.
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* GPLv2
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* rotozoom.c -> s.bechet@av7.net
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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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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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if(a<0) 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) a -= 2*MY_PI; // -PI/2 .. 3PI/2
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if(a>=MY_PI/2 ) 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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typedef unsigned char UINT8;
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static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
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UINT8 *src, 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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UINT8 *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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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,"w");
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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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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 teta = 0;
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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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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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void gen_image(int num, int w, int h)
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{
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const int c = h_cos [teta];
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const int s = h_sin [teta];
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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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#if 1
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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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#else
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{
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unsigned dep;
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dep = ((x>>16)&255) + (((y>>16)&255)<<8);
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put_pixel(i, j, tab_r[dep], tab_g[dep], tab_b[dep]);
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}
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#endif
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}
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}
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teta = (teta+1) % 360;
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}
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#define W 256
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#define H 256
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void init_demo(const char *filename) {
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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 *fichier;
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fichier = fopen(filename,"r");
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if (!fichier) {
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perror(filename);
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exit(1);
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}
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fread(line, 1, 15, fichier);
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for (i=0;i<H;i++) {
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fread(line,1,3*W,fichier);
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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(fichier);
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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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}
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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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exit(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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init_demo(argv[2]);
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for(i=0;i<DEFAULT_NB_PICT;i++) {
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snprintf(buf, sizeof(buf), "%s%d.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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