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/*
* logotool - tool to modify logo images with simple compression
* Copyright (C) 2007
* esteve <esteve@eslack.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
void RGBtoYUV(unsigned short in565, unsigned char *yuv)
{
/* 2 bytes, 565
* RRRRR GGGGGG BBBBB
*/
int i;
i = (in565>>8)&0xFF;
in565 = (in565<<8)&0xFF00;
in565 |= i;
int rgb[3];
rgb[0] = (in565>>11)&0x1F;
rgb[1] = (in565>>5)&0x3F;
rgb[2] = (in565)&0x1F;
rgb[0] = (rgb[0]<<3) | 0x7;
rgb[1] = (rgb[1]<<2) | 0x3;
rgb[2] = (rgb[2]<<3) | 0x7;
/*yuv[0] = 0.299*rgb[0] + 0.587*rgb[1] + 0.114*rgb[2];
yuv[1] = (rgb[2]-yuv[0])*0.565 + 128;
yuv[2] = (rgb[0]-yuv[0])*0.713 + 128;*/
yuv[0] = (0.257 * rgb[0]) + (0.504 * rgb[1]) + (0.098 * rgb[2]) + 16;
yuv[1] = 128 - (0.148 * rgb[0]) - (0.291 * rgb[1]) + (0.439 * rgb[2]);
yuv[2] = 128 + (0.439 * rgb[0]) - (0.368 * rgb[1]) - (0.071 * rgb[2]);
}
// mplayer caca.yuv -demuxer rawvideo -rawvideo fps=1:w=416:h=70 //:i420
int rgb2yuv(char *from, char *to, int width, int height)
{
int fd=open (from, O_RDONLY );
int fout= open ( to, O_CREAT| O_WRONLY , 0660 );
int fsize;
unsigned char* src;
unsigned char* dstY;
unsigned char* dstU;
unsigned char* dstV;
unsigned char YUV[3];
unsigned short inP;
int i,j;
if (fd == -1) {
printf("cannot open %s\n", from);
return 0;
}
if (fout == -1) {
printf("cannot open %s\n", to);
return 0;
}
fsize = lseek ( fd, 0,SEEK_END);
fsize = lseek ( fd, 0,SEEK_CUR);
lseek ( fd,0, SEEK_SET);
src=malloc ( fsize );
dstY=malloc ( (fsize/2) );
dstU=malloc ( (fsize/2) );
dstV=malloc ( (fsize/2) );
for ( i = 0 ; i < fsize; i+=2 ) {
read ( fd, &inP, 2 );
RGBtoYUV ( inP, YUV );
dstY[i>>1]=YUV[0];
dstU[i>>1]=YUV[1];
dstV[i>>1]=YUV[2];
}
for ( i = 0 ; i < (fsize/2); i++ )
write ( fout,&dstY[i], 1);
for ( i = 0 ; i < height ; i+=2 )
for ( j = 0; j < width ; j +=2 )
write ( fout,&dstU[j+(i*width)], 1);
for ( i = 0 ; i < height ; i+=2 )
for ( j = 0; j < width ; j +=2 )
write ( fout,&dstV[j+(i*width)], 1);
free(dstV); free(dstU); free(dstY); free(src);
return 1;
}
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