audio checkpoint

src/synth/Synth.h

@@ -0,0 +1,48 @@
+
+#pragma once
+
+#include <QObject>
+#include <QAudioFormat>
+#include <QAudioSink>
+#include <QIODevice>
+
+#include <atomic>
+
+struct AudioConfig {
+    int sampleRate = 44100;
+    int channelCount = 1;
+    QAudioFormat::SampleFormat sampleFormat = QAudioFormat::Int16;
+    int bufferSize = 4096; // bytes
+};
+
+class Synth : public QObject {
+    Q_OBJECT
+
+public:
+    explicit Synth(QObject *parent = nullptr);
+    ~Synth();
+
+    // audioSink is the media consumer for the audio data
+    QAudioSink* audioSink() { return audioSink_; }
+
+    // audio config setter/getter 
+    void applyConfig(const AudioConfig& config);
+    const QAudioFormat& format() const { return format_; }
+
+    // synth commands
+    void start();
+    void stop();
+    void setFrequency(float frequency);
+    // bread and butter right here
+    QByteArray generateSamples(qint64 bytes);
+
+private:
+    QAudioFormat format_;
+    QAudioSink *audioSink_ = nullptr;
+    QIODevice *audioDevice_ = nullptr;
+
+    std::atomic<float> frequency_{440.0f};
+    float phase_ = 0.0f;
+
+    float freq = 400.0f;
+};