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DEFINITIONS
This source file includes following definitions.
- int_pow
- int_sin
- rgb24_to_yuv420p
- pgmyuv_save
- put_pixel
- ipol
- gen_image
- init_demo
- main
/*
* Generates 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))
typedef unsigned char UINT8;
static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
UINT8 *src, int width, int height)
{
int wrap, wrap3, x, y;
int r, g, b, r1, g1, b1;
UINT8 *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 teta = 0;
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 [teta];
const int s = h_sin [teta];
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;
#if 1
put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y));
#else
{
unsigned dep;
dep = ((x>>16)&255) + (((y>>16)&255)<<8);
put_pixel(i, j, tab_r[dep], tab_g[dep], tab_b[dep]);
}
#endif
}
}
teta = (teta+1) % 360;
}
#define W 256
#define H 256
static void init_demo(const char *filename) {
int i,j;
int h;
int radian;
char line[3 * W];
FILE *fichier;
fichier = fopen(filename,"rb");
if (!fichier) {
perror(filename);
exit(1);
}
fread(line, 1, 15, fichier);
for (i=0;i<H;i++) {
fread(line,1,3*W,fichier);
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(fichier);
/* 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;
}
}
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]);
exit(1);
}
w = DEFAULT_WIDTH;
h = DEFAULT_HEIGHT;
rgb_tab = malloc(w * h * 3);
wrap = w * 3;
width = w;
height = h;
init_demo(argv[2]);
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;
}