#include "quickcam.h"

//linux specific
#include <sys/ioctl.h>
#include <linux/videodev.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

#define WIDTH 640
#define HEIGHT 480

Quickcam::Quickcam( char *device )
	: Camera(WIDTH, HEIGHT),
	bytes(WIDTH*HEIGHT*4)
{
	fd = open(device, O_RDWR);
	if (fd == -1) {
		fprintf(stderr, "failed to open video device %s: %s\n", device, strerror(errno));
		exit(1);
	}
	
	/*
	struct video_capability cap;
	if (ioctl(fd, VIDIOCGCAP, &cap) == -1) {
		fprintf(stderr, "(querycap) %s\n", strerror(errno));
		return EXIT_FAILURE;
	}
	*/

	struct video_picture pict;
	doOrDie(ioctl(fd, VIDIOCGPICT, &pict), "getpict");

	pict.palette = VIDEO_PALETTE_RGB32;
	doOrDie(ioctl(fd, VIDIOCSPICT, &pict), "setpict");

	struct video_window win;

	//get window info
	doOrDie(ioctl(fd, VIDIOCGWIN, &win), "getwin");

	win.width = WIDTH;
	win.height = HEIGHT;

	//set window info
	doOrDie(ioctl(fd, VIDIOCSWIN, &win), "error setting window size");

}

Quickcam::~Quickcam( void )
{
	close(fd);
}

void Quickcam::doOrDie(int retval, char *message)
{
	if (retval == -1) {
		fprintf(stderr, "%s: %s\n", message, strerror(errno));
		exit(1);
	}
}

void Quickcam::update( void )
{
	int read_sz = read(fd, pixels->pixels, bytes);
	doOrDie(read_sz, "read failure");
}