add parameter store

src/synth/AudioEngine.h

@@ -5,6 +5,8 @@
 #include <stdint.h>
 #include <atomic>
 
+#include "Synth.h"
+
 class AudioEngine {
 
 public:
@@ -13,19 +15,19 @@ public:
 
     bool start();
     void stop();
-
-    void setFrequency(float freq);
+    ParameterStore* parameters() { return &params_; }
 
 private: 
     static int32_t audioCallback(void* outputBuffer, void* inputBuffer, uint32_t nFrames, double streamTime, RtAudioStreamStatus status, void* userData);
     int32_t process(float* out, uint32_t nFrames);
 
+    ParameterStore params_;
+    Synth synth_;
+
+    // TODO: id like a yml config file or something for these
     RtAudio audio_;
     uint32_t sampleRate_ = 44100;
-    uint32_t bufferFrames_ = 256;
-
-    std::atomic<float> targetFreq_{ 400.0f };
-    float currentFreq_ = 440.0f;
-    float phase_ = 0.0f;
+    uint32_t bufferFrames_ = 256; // time per buffer = BF/SR (256/44100 = 5.8ms)
+    uint32_t channels_ = 2; // stereo
 
 };