freebsd-dev/share/examples/meteor/rgb24.c

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/* capture a PPM file using 24 bit RGB image and read() */
/* Copyright (c) 1995 Mark Tinguely and Jim Lowe
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Tinguely and Jim Lowe
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/fcntl.h>
/*#include <machine/ioctl_meteor.h>*/
#include "/sys/i386/include/ioctl_meteor.h"
extern int errno;
#define ROWS 300
#define COLS 400
#define SIZE (ROWS * COLS * 4)
main()
{
struct meteor_geomet geo;
char buf[SIZE],b[4],header[16],*p;
int i,o,c;
if ((i = open("/dev/meteor", O_RDONLY)) < 0) {
printf("open failed: %d\n", errno);
exit(1);
}
/* set up the capture type and size */
geo.rows = ROWS;
geo.columns = COLS;
geo.frames = 1;
geo.oformat = METEOR_GEO_RGB24 ;
if (ioctl(i, METEORSETGEO, &geo) < 0) {
printf("ioctl failed: %d\n", errno);
exit(1);
}
c = METEOR_FMT_NTSC;
if (ioctl(i, METEORSFMT, &c) < 0) {
printf("ioctl failed: %d\n", errno);
exit(1);
}
c = METEOR_INPUT_DEV0;
if (ioctl(i, METEORSINPUT, &c) < 0) {
printf("ioctl failed: %d\n", errno);
exit(1);
}
if ((c=read(i, &buf[0], SIZE)) < SIZE) {
printf("read failed %d %d %d\n", c, i, errno);
close(i);
exit(1);
}
close(i);
if ((o = open("rgb24.ppm", O_WRONLY | O_CREAT, 0644)) < 0) {
printf("ppm open failed: %d\n", errno);
exit(1);
}
/* make PPM header and save to file */
strcpy(&header[0], "P6 400 300 255 ");
header[2] = header[6] = header[10] = header[14] = '\n';
write (o, &header[0], 15);
/* save the RGB data to PPM file */
for (p = &buf[0]; p < &buf[SIZE]; ) {
b[2] = *p++; /* blue */
b[1] = *p++; /* green */
b[0] = *p++; /* red */
*p++; /* NULL byte */
write(o,&b[0], 3); /* not very efficient */
}
close(o);
exit(0);
}