add parameter store

src/synth/AudioEngine.cpp

@@ -1,18 +1,17 @@
 
 #include "AudioEngine.h"
 
-#define _USE_MATH_DEFINES
-#include <cmath>
 #include <iostream>
 
-#ifndef M_PI // I hate my stupid chungus life
-    #define M_PI 3.14159265358979323846
-#endif
-
-AudioEngine::AudioEngine() {
+AudioEngine::AudioEngine() : synth_(params_) {
     if(audio_.getDeviceCount() < 1) {
         throw std::runtime_error("No audio devices found");
     }
+
+    // TODO: get audio configurations
+
+    synth_.setSampleRate(sampleRate_);
+
 }
 
 AudioEngine::~AudioEngine() {
@@ -23,24 +22,17 @@ bool AudioEngine::start() {
 
     RtAudio::StreamParameters params;
     params.deviceId = audio_.getDefaultOutputDevice();
-    params.nChannels = 2;
+    params.nChannels = channels_;
     params.firstChannel = 0;
 
     RtAudio::StreamOptions options;
     options.flags = RTAUDIO_MINIMIZE_LATENCY;
 
-    /*
-    try {
-        audio_.openStream(&params, nullptr, RTAUDIO_FLOAT32, sampleRate_, &bufferFrames_, &AudioEngine::audioCallback, this, &options);
-        audio_.startStream();
-    } catch(RtAudioError& e) {
-        std::cerr << e.getMessage() << std::endl;
-        return false;
-    }
-    */
+    // TODO: error check this please
     audio_.openStream(&params, nullptr, RTAUDIO_FLOAT32, sampleRate_, &bufferFrames_, &AudioEngine::audioCallback, this, &options);
     audio_.startStream();
 
+    // sanity check
     std::cout << "sample rate: " << sampleRate_ << "  buffer frames: " << bufferFrames_ << std::endl;
     return true;
 
@@ -52,10 +44,6 @@ void AudioEngine::stop() {
     if(audio_.isStreamOpen()) audio_.closeStream();
 }
 
-void AudioEngine::setFrequency(float freq) {
-    targetFreq_.store(freq, std::memory_order_relaxed);
-}
-
 int32_t AudioEngine::audioCallback( void* outputBuffer, void*, uint32_t nFrames, double, RtAudioStreamStatus status, void* userData) {
     
     if (status) std::cerr << "Stream underflow!" << std::endl;
@@ -64,21 +52,9 @@ int32_t AudioEngine::audioCallback( void* outputBuffer, void*, uint32_t nFrames,
 }
 
 int32_t AudioEngine::process(float* out, uint32_t nFrames) {
-    const float sr = static_cast<float>(sampleRate_);
-    float target = targetFreq_.load(std::memory_order_relaxed);
-    float freqStep = (target - currentFreq_) / nFrames;
 
-    for (uint32_t i = 0; i < nFrames; ++i) {
-        currentFreq_ += freqStep;
-
-        float phaseInc = 2.0f * M_PI * currentFreq_ / sr;
-
-        out[2*i] = std::sin(phase_); // left
-        out[2*i+1] = std::sin(phase_); // right
-
-        phase_ += phaseInc;
-        if (phase_ > 2.0f * M_PI) phase_ -= 2.0f * M_PI;
-    }
+    // pass to synth
+    synth_.process(out, nFrames, sampleRate_);
 
     return 0;
 }