Qt: Ensure proper audio sample rate is used when resampling audio

src/platform/qt/AudioProcessor.h

@@ -39,6 +39,8 @@ public slots:
 	virtual void setBufferSamples(int samples) = 0;
 	virtual void inputParametersChanged() = 0;
 
+	virtual unsigned sampleRate() const = 0;
+
 protected:
 	GBAThread* input() { return m_context; }
 

src/platform/qt/AudioProcessorQt.cpp

@@ -83,3 +83,10 @@ void AudioProcessorQt::inputParametersChanged() {
 		m_device->setFormat(m_audioOutput->format());
 	}
 }
+
+unsigned AudioProcessorQt::sampleRate() const {
+	if (!m_audioOutput) {
+		return 0;
+	}
+	return m_audioOutput->format().sampleRate();
+}

src/platform/qt/AudioProcessorQt.h

@@ -28,6 +28,8 @@ public slots:
 	virtual void setBufferSamples(int samples);
 	virtual void inputParametersChanged();
 
+	virtual unsigned sampleRate() const override;
+
 private:
 	QAudioOutput* m_audioOutput;
 	AudioDevice* m_device;

src/platform/qt/AudioProcessorSDL.cpp

@@ -54,3 +54,7 @@ void AudioProcessorSDL::setBufferSamples(int samples) {
 
 void AudioProcessorSDL::inputParametersChanged() {
 }
+
+unsigned AudioProcessorSDL::sampleRate() const {
+	return m_audio.obtainedSpec.freq;
+}

src/platform/qt/AudioProcessorSDL.h

@@ -29,6 +29,8 @@ public slots:
 	virtual void setBufferSamples(int samples);
 	virtual void inputParametersChanged();
 
+	virtual unsigned sampleRate() const override;
+
 private:
 	GBASDLAudio m_audio;
 };

src/platform/qt/GameController.cpp

@@ -746,7 +746,7 @@ void GameController::redoSamples(int samples) {
 	if (m_threadContext.gba) {
 		sampleRate = m_threadContext.gba->audio.sampleRate;
 	}
-	ratio = GBAAudioCalculateRatio(sampleRate, m_threadContext.fpsTarget, 44100);
+	ratio = GBAAudioCalculateRatio(sampleRate, m_threadContext.fpsTarget, m_audioProcess->sampleRate());
 	m_threadContext.audioBuffers = ceil(samples / ratio);
 #else
 	m_threadContext.audioBuffers = samples;