* Initial import of the logotool utility

logotool/rgb2yuv.c

@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2007
+ *       esteve <esteve@eslack.org>
+ *
+ * logotool 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * logotool 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 logotool; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#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);
+	return 1;
+}