Qt: Fix FPS target and SDL initialization audio issues

src/platform/qt/AudioProcessor.cpp

@@ -33,3 +33,7 @@ AudioProcessor::AudioProcessor(QObject* parent)
 void AudioProcessor::setInput(GBAThread* input) {
 	m_context = input;
 }
+
+void AudioProcessor::setBufferSamples(int samples) {
+	m_samples = samples;
+}

src/platform/qt/AudioProcessor.h

@@ -19,6 +19,7 @@ public:
 	AudioProcessor(QObject* parent = nullptr);
 
 	virtual void setInput(GBAThread* input);
+	int getBufferSamples() const { return m_samples; }
 
 public slots:
 	virtual void start() = 0;
@@ -29,8 +30,10 @@ public slots:
 
 protected:
 	GBAThread* input() { return m_context; }
+
 private:
 	GBAThread* m_context;
+	int m_samples;
 };
 
 }

src/platform/qt/AudioProcessorQt.cpp

@@ -63,6 +63,7 @@ void AudioProcessorQt::pause() {
 }
 
 void AudioProcessorQt::setBufferSamples(int samples) {
+	AudioProcessor::setBufferSamples(samples);
 	if (m_audioOutput) {
 		m_audioOutput->stop();
 		m_audioOutput->setBufferSize(samples * 4);

src/platform/qt/AudioProcessorSDL.cpp

@@ -25,7 +25,9 @@ void AudioProcessorSDL::start() {
 	if (m_audio.thread) {
 		GBASDLResumeAudio(&m_audio);
 	} else {
-		m_audio.samples = input()->audioBuffers;
+		if (!m_audio.samples) {
+			m_audio.samples = input()->audioBuffers;
+		}
 		GBASDLInitAudio(&m_audio, input());
 	}
 }
@@ -35,9 +37,10 @@ void AudioProcessorSDL::pause() {
 }
 
 void AudioProcessorSDL::setBufferSamples(int samples) {
+	AudioProcessor::setBufferSamples(samples);
+	m_audio.samples = samples;
 	if (m_audio.thread) {
 		GBASDLDeinitAudio(&m_audio);
-		m_audio.samples = samples;
 		GBASDLInitAudio(&m_audio, input());
 	}
 }

src/platform/qt/GameController.cpp

@@ -276,23 +276,16 @@ void GameController::keyReleased(int key) {
 }
 
 void GameController::setAudioBufferSamples(int samples) {
-	if (m_gameOpen) {
-		threadInterrupt();
-		float ratio = GBAAudioCalculateRatio(m_threadContext.gba->audio.sampleRate, m_threadContext.fpsTarget, 44100);
-		m_threadContext.audioBuffers = samples / ratio;
-		GBAAudioResizeBuffer(&m_threadContext.gba->audio, samples / ratio);
-		threadContinue();
-	} else {
-		float ratio = GBAAudioCalculateRatio(0x8000, m_threadContext.fpsTarget, 44100);
-		m_threadContext.audioBuffers = samples / ratio;
-
-	}
+	threadInterrupt();
+	redoSamples(samples);
+	threadContinue();
 	QMetaObject::invokeMethod(m_audioProcessor, "setBufferSamples", Q_ARG(int, samples));
 }
 
 void GameController::setFPSTarget(float fps) {
 	threadInterrupt();
 	m_threadContext.fpsTarget = fps;
+	redoSamples(m_audioProcessor->getBufferSamples());
 	threadContinue();
 	QMetaObject::invokeMethod(m_audioProcessor, "inputParametersChanged");
 }
@@ -375,6 +368,19 @@ void GameController::updateKeys() {
 	m_threadContext.activeKeys = activeKeys;
 }
 
+void GameController::redoSamples(int samples) {
+	float sampleRate = 0x8000;
+	float ratio;
+	if (m_threadContext.gba) {
+		sampleRate = m_threadContext.gba->audio.sampleRate;
+	}
+	ratio = GBAAudioCalculateRatio(sampleRate, m_threadContext.fpsTarget, 44100);
+	m_threadContext.audioBuffers = ceil(samples / ratio);
+	if (m_threadContext.gba) {
+		GBAAudioResizeBuffer(&m_threadContext.gba->audio, m_threadContext.audioBuffers);
+	}
+}
+
 void GameController::setLogLevel(int levels) {
 	threadInterrupt();
 	m_logLevels = levels;

src/platform/qt/GameController.h

@@ -109,6 +109,7 @@ private:
 
 private:
 	void updateKeys();
+	void redoSamples(int samples);
 
 	uint32_t* m_drawContext;
 	GBAThread m_threadContext;