Reuse an audio thread instead of shutting it down and making a new one

src/platform/qt/AudioDevice.cpp

@@ -53,6 +53,14 @@ void AudioThread::shutdown() {
 	quit();
 }
 
+void AudioThread::pause() {
+	m_audioOutput->stop();
+}
+
+void AudioThread::resume() {
+	m_audioOutput->start(m_device);
+}
+
 void AudioThread::run() {
 	QAudioFormat format;
 	format.setSampleRate(44100);
@@ -62,11 +70,11 @@ void AudioThread::run() {
 	format.setByteOrder(QAudioFormat::LittleEndian);
 	format.setSampleType(QAudioFormat::SignedInt);
 
-	AudioDevice device(m_input);
+	m_device = new AudioDevice(m_input);
 	m_audioOutput = new QAudioOutput(format);
 	m_audioOutput->setBufferSize(1024);
-	device.setFormat(m_audioOutput->format());
-	m_audioOutput->start(&device);
+	m_device->setFormat(m_audioOutput->format());
+	m_audioOutput->start(m_device);
 
 	exec();
 }

src/platform/qt/AudioDevice.h

@@ -10,25 +10,6 @@ struct GBAThread;
 
 namespace QGBA {
 
-class AudioThread : public QThread {
-Q_OBJECT
-
-public:
-	AudioThread(QObject* parent = nullptr);
-
-	void setInput(GBAThread* input);
-
-public slots:
-	void shutdown();
-
-protected:
-	void run();
-
-private:
-	GBAThread* m_input;
-	QAudioOutput* m_audioOutput;
-};
-
 class AudioDevice : public QIODevice {
 Q_OBJECT
 
@@ -47,6 +28,28 @@ private:
 	float m_ratio;
 };
 
+class AudioThread : public QThread {
+Q_OBJECT
+
+public:
+	AudioThread(QObject* parent = nullptr);
+
+	void setInput(GBAThread* input);
+
+public slots:
+	void shutdown();
+	void pause();
+	void resume();
+
+protected:
+	void run();
+
+private:
+	GBAThread* m_input;
+	QAudioOutput* m_audioOutput;
+	AudioDevice* m_device;
+};
+
 }
 
 #endif

src/platform/qt/GameController.cpp

@@ -18,6 +18,7 @@ GameController::GameController(QObject* parent)
 	m_renderer->outputBuffer = (color_t*) m_drawContext;
 	m_renderer->outputBufferStride = 256;
 	m_threadContext = {
+		.state = THREAD_INITIALIZED,
 		.debugger = 0,
 		.frameskip = 0,
 		.biosFd = -1,
@@ -92,7 +93,7 @@ void GameController::loadGame(const QString& path) {
 
 void GameController::closeGame() {
 	// TODO: Make this threadsafe
-	if (m_threadContext.state >= THREAD_EXITING) {
+	if (m_threadContext.state >= THREAD_EXITING || m_threadContext.state <= THREAD_INITIALIZED) {
 		return;
 	}
 	GBAThreadEnd(&m_threadContext);

src/platform/qt/Window.cpp

@@ -12,6 +12,7 @@ using namespace QGBA;
 
 Window::Window(QWidget* parent)
 	: QMainWindow(parent)
+	, m_audioThread(nullptr)
 #ifdef USE_GDB_STUB
 	, m_gdbController(nullptr)
 #endif
@@ -24,6 +25,7 @@ Window::Window(QWidget* parent)
 	setCentralWidget(m_display);
 	connect(m_controller, SIGNAL(gameStarted(GBAThread*)), this, SLOT(gameStarted(GBAThread*)));
 	connect(m_controller, SIGNAL(gameStopped(GBAThread*)), m_display, SLOT(stopDrawing()));
+	connect(m_controller, SIGNAL(gameStopped(GBAThread*)), this, SLOT(gameStopped()));
 	connect(this, SIGNAL(startDrawing(const uint32_t*, GBAThread*)), m_display, SLOT(startDrawing(const uint32_t*, GBAThread*)), Qt::QueuedConnection);
 	connect(this, SIGNAL(shutdown()), m_display, SLOT(stopDrawing()));
 
@@ -122,11 +124,21 @@ void Window::gameStarted(GBAThread* context) {
 	foreach (QAction* action, m_gameActions) {
 		action->setDisabled(false);
 	}
-	AudioThread* thread = new AudioThread(this);
-	thread->setInput(context);
-	thread->start(QThread::HighPriority);
-	connect(this, SIGNAL(shutdown()), thread, SLOT(shutdown()));
-	connect(m_controller, SIGNAL(gameStopped(GBAThread*)), thread, SLOT(shutdown()));
+	if (!m_audioThread) {
+		m_audioThread = new AudioThread(this);
+		connect(this, SIGNAL(shutdown()), m_audioThread, SLOT(shutdown()));
+		m_audioThread->setInput(context);
+		m_audioThread->start(QThread::HighPriority);
+	} else {
+		m_audioThread->resume();
+	}
+}
+
+void Window::gameStopped() {
+	foreach (QAction* action, m_gameActions) {
+		action->setDisabled(true);
+	}
+	m_audioThread->pause();
 }
 
 void Window::setupMenu(QMenuBar* menubar) {

src/platform/qt/Window.h

@@ -40,11 +40,13 @@ protected:
 
 private slots:
 	void gameStarted(GBAThread*);
+	void gameStopped();
 
 private:
 	void setupMenu(QMenuBar*);
 	GameController* m_controller;
 	Display* m_display;
+	AudioThread* m_audioThread;
 	QList<QAction*> m_gameActions;
 
 #ifdef USE_GDB_STUB