mumble/plugins/link/link.cpp

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <math.h>

#include "../mumble_plugin.h"

struct LinkedMem {
	DWORD	dwVersion;
	DWORD	dwTick;
	float	fPosition[3];
	float	fFront[3];
	float	fTop[3];
};

static void about(HWND h) {
	::MessageBox(h, L"Reads audio position information from linked game", L"Mumble Link Plugin", MB_OK);
}

static HANDLE hMapObject = NULL;
LinkedMem *lm = NULL;

static void unlock() {
	if (lm) {
		UnmapViewOfFile(lm);
		lm = NULL;
	}
	if (hMapObject) {
		CloseHandle(hMapObject);
		hMapObject = NULL;
	}
	return;
}

static int trylock() {
	hMapObject = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, sizeof(LinkedMem), L"MumbleLink");
	if (hMapObject == NULL) {
		return false;
	}

	lm = (LinkedMem *) MapViewOfFile(hMapObject, FILE_MAP_WRITE, 0, 0, 0);
	if (lm == NULL) {
		CloseHandle(hMapObject);
		hMapObject = NULL;
		return false;
	}

	if (lm->dwVersion == 1) {
		if ((GetTickCount() - lm->dwTick) < 500)
			return true;
	}

	unlock();

	return false;
}


static int fetch(float *pos, float *front, float *top) {
	if ((GetTickCount() - lm->dwTick) > 500)
		return false;

	for(int i=0;i<3;i++)
		pos[i]=lm->fPosition[i];
	for(int i=0;i<3;i++)
		front[i]=lm->fFront[i];
	for(int i=0;i<3;i++)
		top[i]=lm->fTop[i];

	return true;
}

static MumblePlugin linkplug = {
	MUMBLE_PLUGIN_MAGIC,
	L"Link v1.00",
	L"Link",
	about,
	NULL,
	trylock,
	unlock,
	fetch
};

extern "C" __declspec(dllexport) __cdecl MumblePlugin *getMumblePlugin() {
	return &linkplug;
}