openFrameworks / soundStream: audioIn / audioOut from maximilian example

ofApp.cpp

//.h
// For drawing
  float waveform[4096]; //make this bigger, just in case
  int waveIndex;

  ofSoundStream soundStream;

  /* ofxMaxi*/
  void audioIn(ofSoundBuffer& input) override; // not used in this example
  void audioOut(ofSoundBuffer& output) override;
  maxiOsc oscillator1;

//--------------------------------------------------------------
void ofApp::audioIn(ofSoundBuffer& input){
    std::size_t nChannels = input.getNumChannels();
    for (size_t i = 0; i < input.getNumFrames(); i++)
    {
        // handle input here
    }
}
//--------------------------------------------------------------
void ofApp::audioOut(ofSoundBuffer& output){
    std::size_t outChannels = output.getNumChannels();
    for (int i = 0; i < output.getNumFrames(); ++i){
        
        output[i * outChannels] = oscillator1.square(532) * 0.5;
        output[i * outChannels + 1] = output[i * outChannels];
        
        //Hold the values so the draw method can draw them
        waveform[waveIndex] =  output[i * outChannels];
        if (waveIndex < (ofGetWidth() - 1)) {
            ++waveIndex;
        } else {
            waveIndex = 0;
        }
    }
}
//------------------------------------------------
void ofApp::setup(){
    
    //Initialize the drawing variables
    for (int i = 0; i < ofGetWidth(); ++i) {
        waveform[i] = 0;
    }
    waveIndex = 0;
    
    // Maximilian audio stuff
    int sampleRate = 44100; /* Sampling Rate */
    int bufferSize= 512; /* Buffer Size. you have to fill this buffer with sound using the for loop in the audioOut method */
    ofxMaxiSettings::setup(sampleRate, 2, bufferSize);
    
    // Setup ofSound
    ofSoundStreamSettings settings;
    settings.setOutListener(this);
    settings.sampleRate = sampleRate;
    settings.numOutputChannels = 2;
    settings.numInputChannels = 0;
    settings.bufferSize = bufferSize;
    soundStream.setup(settings);
}

//--------------------------------------------------------------
void ofApp::draw(){
    /////////////// waveform
    ofTranslate(0, ofGetHeight()/2);
    ofSetColor(0, 255, 0);
    ofFill();
    ofDrawLine(0, 0, 1, waveform[1] * ofGetHeight()/2.); //first line
    for(int i = 1; i < (ofGetWidth() - 1); ++i) {
        ofDrawLine(i, waveform[i] * ofGetHeight()/2., i + 1, waveform[i+1] * ofGetHeight()/2.);
    }
}