/* Set the XV_SWITCHCRT property to 1, so that Xv output goes to the second
 * head of a dual-head card. (In my case, an ATi Radeon 9200SE, where I'm using
 * the analogue output.)
 * Released into the public domain; by Adam Sampson <azz@us-lot.org> */

#include <stdio.h>
#include <stdlib.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xvlib.h>

void die(const char *s) {
	fprintf(stderr, "xvset: %s\n", s);
	exit(1);
}

int main(int argc, char **argv) {
	Display *display;
	Atom attribute;
	unsigned int nadaptors;
	XvAdaptorInfo *ainfo;

	display = XOpenDisplay(NULL);
	if (!display)
		die("can't open display");

	XvQueryAdaptors(display, RootWindow(display, 0), &nadaptors, &ainfo);
	if (nadaptors != 1)
		die("not exactly 1 adaptor");

	attribute = XInternAtom(display, "XV_SWITCHCRT", False);
	XvSetPortAttribute(display, ainfo[0].base_id, attribute, 1);

	XCloseDisplay(display);

	return 0;
}