libobs: Robust COM initialization

Qt seems to force STA, so it's misleading to ask for MTA and ignore the
failure result, so just ask for STA. Also, don't uninitialize COM if
initialization failed.

libobs/obs-windows.c

@@ -1259,9 +1259,15 @@ void obs_init_win32_crash_handler(void)
 	initialize_crash_handler();
 }
 
-void initialize_com(void)
+bool initialize_com(void)
 {
-	CoInitializeEx(0, COINIT_MULTITHREADED);
+	const HRESULT hr = CoInitializeEx(0, COINIT_APARTMENTTHREADED);
+	const bool success = SUCCEEDED(hr);
+	if (success)
+		blog(LOG_INFO, "CoInitializeEx succeeded: 0x%08X", hr);
+	else
+		blog(LOG_ERROR, "CoInitializeEx failed: 0x%08X", hr);
+	return success;
 }
 
 void uninitialize_com(void)

libobs/obs.c

@@ -871,8 +871,9 @@ static bool obs_init(const char *locale, const char *module_config_path,
 }
 
 #ifdef _WIN32
-extern void initialize_com(void);
+extern bool initialize_com(void);
 extern void uninitialize_com(void);
+static bool com_initialized = false;
 #endif
 
 /* Separate from actual context initialization
@@ -933,7 +934,7 @@ bool obs_startup(const char *locale, const char *module_config_path,
 	}
 
 #ifdef _WIN32
-	initialize_com();
+	com_initialized = initialize_com();
 #endif
 
 	success = obs_init(locale, module_config_path, store);
@@ -1048,7 +1049,8 @@ void obs_shutdown(void)
 	bfree(cmdline_args.argv);
 
 #ifdef _WIN32
-	uninitialize_com();
+	if (com_initialized)
+		uninitialize_com();
 #endif
 }