Fix crash when no audio driver is available

drivers/rtaudio/audio_driver_rtaudio.cpp

@@ -143,7 +143,7 @@ Error AudioDriverRtAudio::init() {
 		}
 	}
 
-	return OK;
+	return active ? OK : ERR_UNAVAILABLE;
 }
 
 int AudioDriverRtAudio::get_mix_rate() const {

platform/android/os_android.cpp

@@ -137,12 +137,7 @@ void OS_Android::initialize(const VideoMode &p_desired, int p_video_driver, int
 	visual_server->init();
 	//	visual_server->cursor_set_visible(false, 0);
 
-	AudioDriverManager::get_driver(p_audio_driver)->set_singleton();
+	AudioDriverManager::initialize(p_audio_driver);
-
-	if (AudioDriverManager::get_driver(p_audio_driver)->init() != OK) {
-
-		ERR_PRINT("Initializing audio failed.");
-	}
 
 	physics_server = memnew(PhysicsServerSW);
 	physics_server->init();

platform/haiku/os_haiku.cpp

@@ -137,11 +137,7 @@ void OS_Haiku::initialize(const VideoMode &p_desired, int p_video_driver, int p_
 	//physics_2d_server = Physics2DServerWrapMT::init_server<Physics2DServerSW>();
 	physics_2d_server->init();
 
-	AudioDriverManager::get_driver(p_audio_driver)->set_singleton();
+	AudioDriverManager::initialize(p_audio_driver);
-
-	if (AudioDriverManager::get_driver(p_audio_driver)->init() != OK) {
-		ERR_PRINT("Initializing audio failed.");
-	}
 
 	power_manager = memnew(PowerHaiku);
 }

platform/javascript/os_javascript.cpp

@@ -464,11 +464,7 @@ void OS_JavaScript::initialize(const VideoMode &p_desired, int p_video_driver, i
 	print_line("Init Audio");
 
 	AudioDriverManager::add_driver(&audio_driver_javascript);
-	audio_driver_javascript.set_singleton();
+	AudioDriverManager::initialize(p_audio_driver);
-	if (audio_driver_javascript.init() != OK) {
-
-		ERR_PRINT("Initializing audio failed.");
-	}
 
 	RasterizerGLES3::register_config();
 	RasterizerGLES3::make_current();

platform/osx/os_osx.mm

@@ -1088,12 +1088,7 @@ void OS_OSX::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 	visual_server->init();
 	//	visual_server->cursor_set_visible(false, 0);
 
-	AudioDriverManager::get_driver(p_audio_driver)->set_singleton();
+	AudioDriverManager::initialize(p_audio_driver);
-
-	if (AudioDriverManager::get_driver(p_audio_driver)->init() != OK) {
-
-		ERR_PRINT("Initializing audio failed.");
-	}
 
 	//
 	physics_server = memnew(PhysicsServerSW);

platform/server/os_server.cpp

@@ -62,12 +62,7 @@ void OS_Server::initialize(const VideoMode &p_desired, int p_video_driver, int p
 
 	//visual_server = memnew( VisualServerRaster(rasterizer) );
 
-	AudioDriverManager::get_driver(p_audio_driver)->set_singleton();
+	AudioDriverManager::initialize(p_audio_driver);
-
-	if (AudioDriverManager::get_driver(p_audio_driver)->init() != OK) {
-
-		ERR_PRINT("Initializing audio failed.");
-	}
 
 	sample_manager = memnew(SampleManagerMallocSW);
 	audio_server = memnew(AudioServerSW(sample_manager));
@@ -232,7 +227,6 @@ void OS_Server::run() {
 
 OS_Server::OS_Server() {
 
-	AudioDriverManager::add_driver(&driver_dummy);
 	//adriver here
 	grab = false;
 };

platform/server/os_server.h

@@ -34,7 +34,6 @@
 #include "drivers/rtaudio/audio_driver_rtaudio.h"
 #include "drivers/unix/os_unix.h"
 #include "main/input_default.h"
-#include "servers/audio/audio_driver_dummy.h"
 #include "servers/audio_server.h"
 #include "servers/physics_2d/physics_2d_server_sw.h"
 #include "servers/physics_server.h"
@@ -55,7 +54,6 @@ class OS_Server : public OS_Unix {
 	List<String> args;
 	MainLoop *main_loop;
 
-	AudioDriverDummy driver_dummy;
 	bool grab;
 
 	PhysicsServer *physics_server;

platform/uwp/os_uwp.cpp

@@ -268,12 +268,7 @@ void OSUWP::initialize(const VideoMode &p_desired, int p_video_driver, int p_aud
 	joypad = ref new JoypadUWP(input);
 	joypad->register_events();
 
-	AudioDriverManager::get_driver(p_audio_driver)->set_singleton();
+	AudioDriverManager::initialize(p_audio_driver);
-
-	if (AudioDriverManager::get_driver(p_audio_driver)->init() != OK) {
-
-		ERR_PRINT("Initializing audio failed.");
-	}
 
 	power_manager = memnew(PowerUWP);
 

platform/windows/os_windows.cpp

@@ -1081,12 +1081,7 @@ void OS_Windows::initialize(const VideoMode &p_desired, int p_video_driver, int
 
 	power_manager = memnew(PowerWindows);
 
-	AudioDriverManager::get_driver(p_audio_driver)->set_singleton();
+	AudioDriverManager::initialize(p_audio_driver);
-
-	if (AudioDriverManager::get_driver(p_audio_driver)->init() != OK) {
-
-		ERR_PRINT("Initializing audio failed.");
-	}
 
 	TRACKMOUSEEVENT tme;
 	tme.cbSize = sizeof(TRACKMOUSEEVENT);

platform/x11/os_x11.cpp

@@ -313,29 +313,7 @@ void OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 		XFree(xsh);
 	}
 
-	AudioDriverManager::get_driver(p_audio_driver)->set_singleton();
+	AudioDriverManager::initialize(p_audio_driver);
-
-	audio_driver_index = p_audio_driver;
-	if (AudioDriverManager::get_driver(p_audio_driver)->init() != OK) {
-
-		bool success = false;
-		audio_driver_index = -1;
-		for (int i = 0; i < AudioDriverManager::get_driver_count(); i++) {
-			if (i == p_audio_driver)
-				continue;
-			AudioDriverManager::get_driver(i)->set_singleton();
-			if (AudioDriverManager::get_driver(i)->init() == OK) {
-				success = true;
-				print_line("Audio Driver Failed: " + String(AudioDriverManager::get_driver(p_audio_driver)->get_name()));
-				print_line("Using alternate audio driver: " + String(AudioDriverManager::get_driver(i)->get_name()));
-				audio_driver_index = i;
-				break;
-			}
-		}
-		if (!success) {
-			ERR_PRINT("Initializing audio failed.");
-		}
-	}
 
 	ERR_FAIL_COND(!visual_server);
 	ERR_FAIL_COND(x11_window == 0);
@@ -2189,10 +2167,6 @@ bool OS_X11::is_disable_crash_handler() const {
 
 OS_X11::OS_X11() {
 
-#ifdef RTAUDIO_ENABLED
-	AudioDriverManager::add_driver(&driver_rtaudio);
-#endif
-
 #ifdef PULSEAUDIO_ENABLED
 	AudioDriverManager::add_driver(&driver_pulseaudio);
 #endif
@@ -2201,11 +2175,6 @@ OS_X11::OS_X11() {
 	AudioDriverManager::add_driver(&driver_alsa);
 #endif
 
-	if (AudioDriverManager::get_driver_count() == 0) {
-		WARN_PRINT("No sound driver found... Defaulting to dummy driver");
-		AudioDriverManager::add_driver(&driver_dummy);
-	}
-
 	minimized = false;
 	xim_style = 0L;
 	mouse_mode = MOUSE_MODE_VISIBLE;

platform/x11/os_x11.h

@@ -38,11 +38,9 @@
 //#include "servers/visual/visual_server_wrap_mt.h"
 #include "drivers/alsa/audio_driver_alsa.h"
 #include "drivers/pulseaudio/audio_driver_pulseaudio.h"
-#include "drivers/rtaudio/audio_driver_rtaudio.h"
 #include "joypad_linux.h"
 #include "main/input_default.h"
 #include "power_x11.h"
-#include "servers/audio/audio_driver_dummy.h"
 #include "servers/audio_server.h"
 #include "servers/physics_2d/physics_2d_server_sw.h"
 #include "servers/physics_2d/physics_2d_server_wrap_mt.h"
@@ -154,10 +152,6 @@ class OS_X11 : public OS_Unix {
 	JoypadLinux *joypad;
 #endif
 
-#ifdef RTAUDIO_ENABLED
-	AudioDriverRtAudio driver_rtaudio;
-#endif
-
 #ifdef ALSA_ENABLED
 	AudioDriverALSA driver_alsa;
 #endif
@@ -165,7 +159,6 @@ class OS_X11 : public OS_Unix {
 #ifdef PULSEAUDIO_ENABLED
 	AudioDriverPulseAudio driver_pulseaudio;
 #endif
-	AudioDriverDummy driver_dummy;
 
 	Atom net_wm_icon;
 

servers/audio_server.cpp

@@ -32,6 +32,7 @@
 #include "os/file_access.h"
 #include "os/os.h"
 #include "project_settings.h"
+#include "servers/audio/audio_driver_dummy.h"
 #include "servers/audio/effects/audio_effect_compressor.h"
 #ifdef TOOLS_ENABLED
 
@@ -107,6 +108,7 @@ AudioDriver::AudioDriver() {
 
 AudioDriver *AudioDriverManager::drivers[MAX_DRIVERS];
 int AudioDriverManager::driver_count = 0;
+AudioDriverDummy AudioDriverManager::dummy_driver;
 
 void AudioDriverManager::add_driver(AudioDriver *p_driver) {
 
@@ -118,6 +120,43 @@ int AudioDriverManager::get_driver_count() {
 
 	return driver_count;
 }
+
+void AudioDriverManager::initialize(int p_driver) {
+	AudioDriver *driver;
+	int failed_driver = -1;
+
+	// Check if there is a selected driver
+	if (p_driver >= 0 && p_driver < driver_count) {
+		if (drivers[p_driver]->init() == OK) {
+			drivers[p_driver]->set_singleton();
+			return;
+		} else {
+			failed_driver = p_driver;
+		}
+	}
+
+	// No selected driver, try them all in order
+	for (int i = 0; i < driver_count; i++) {
+		// Don't re-init the driver if it failed above
+		if (i == failed_driver) {
+			continue;
+		}
+
+		if (drivers[i]->init() == OK) {
+			drivers[i]->set_singleton();
+			return;
+		}
+	}
+
+	// Fallback to our dummy driver
+	if (dummy_driver.init() == OK) {
+		ERR_PRINT("AudioDriverManager: all drivers failed, falling back to dummy driver");
+		dummy_driver.set_singleton();
+	} else {
+		ERR_PRINT("AudioDriverManager: dummy driver faild to init()");
+	}
+}
+
 AudioDriver *AudioDriverManager::get_driver(int p_driver) {
 
 	ERR_FAIL_INDEX_V(p_driver, driver_count, NULL);

servers/audio_server.h

@@ -35,6 +35,8 @@
 #include "servers/audio/audio_effect.h"
 #include "variant.h"
 
+class AudioDriverDummy;
+
 class AudioDriver {
 
 	static AudioDriver *singleton;
@@ -90,8 +92,11 @@ class AudioDriverManager {
 	static AudioDriver *drivers[MAX_DRIVERS];
 	static int driver_count;
 
+	static AudioDriverDummy dummy_driver;
+
 public:
 	static void add_driver(AudioDriver *p_driver);
+	static void initialize(int p_driver);
 	static int get_driver_count();
 	static AudioDriver *get_driver(int p_driver);
 };