112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
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/*
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* Copyright (C) 2007
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* esteve <esteve@eslack.org>
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*
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* logotool is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* logotool 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with logotool; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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void RGBtoYUV(unsigned short in565, unsigned char *yuv)
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{
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/* 2 bytes, 565
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* RRRRR GGGGGG BBBBB
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*/
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int i;
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i = (in565>>8)&0xFF;
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in565 = (in565<<8)&0xFF00;
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in565 |= i;
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int rgb[3];
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rgb[0] = (in565>>11)&0x1F;
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rgb[1] = (in565>>5)&0x3F;
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rgb[2] = (in565)&0x1F;
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rgb[0] = (rgb[0]<<3) | 0x7;
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rgb[1] = (rgb[1]<<2) | 0x3;
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rgb[2] = (rgb[2]<<3) | 0x7;
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/*yuv[0] = 0.299*rgb[0] + 0.587*rgb[1] + 0.114*rgb[2];
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yuv[1] = (rgb[2]-yuv[0])*0.565 + 128;
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yuv[2] = (rgb[0]-yuv[0])*0.713 + 128;*/
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yuv[0] = (0.257 * rgb[0]) + (0.504 * rgb[1]) + (0.098 * rgb[2]) + 16;
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yuv[1] = 128 - (0.148 * rgb[0]) - (0.291 * rgb[1]) + (0.439 * rgb[2]);
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yuv[2] = 128 + (0.439 * rgb[0]) - (0.368 * rgb[1]) - (0.071 * rgb[2]);
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}
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// mplayer caca.yuv -demuxer rawvideo -rawvideo fps=1:w=416:h=70 //:i420
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int rgb2yuv(char *from, char *to, int width, int height)
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{
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int fd=open (from, O_RDONLY );
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int fout= open ( to, O_CREAT| O_WRONLY , 0660 );
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int fsize;
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unsigned char* src;
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unsigned char* dstY;
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unsigned char* dstU;
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unsigned char* dstV;
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unsigned char YUV[3];
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unsigned short inP;
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int i,j;
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if (fd == -1) {
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printf("cannot open %s\n", from);
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return 0;
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}
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if (fout == -1) {
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printf("cannot open %s\n", to);
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return 0;
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}
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fsize = lseek ( fd, 0,SEEK_END);
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fsize = lseek ( fd, 0,SEEK_CUR);
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lseek ( fd,0, SEEK_SET);
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src=malloc ( fsize );
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dstY=malloc ( (fsize/2) );
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dstU=malloc ( (fsize/2) );
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dstV=malloc ( (fsize/2) );
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for ( i = 0 ; i < fsize; i+=2 ) {
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read ( fd, &inP, 2 );
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RGBtoYUV ( inP, YUV );
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dstY[i>>1]=YUV[0];
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dstU[i>>1]=YUV[1];
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dstV[i>>1]=YUV[2];
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}
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for ( i = 0 ; i < (fsize/2); i++ )
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write ( fout,&dstY[i], 1);
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for ( i = 0 ; i < height ; i+=2 )
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for ( j = 0; j < width ; j +=2 )
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write ( fout,&dstU[j+(i*width)], 1);
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for ( i = 0 ; i < height ; i+=2 )
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for ( j = 0; j < width ; j +=2 )
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write ( fout,&dstV[j+(i*width)], 1);
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return 1;
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}
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