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// download cycolid.wav with:
// $ wget -O cycloid.mp4 "https://vimeo.com/73860675/download?t=1446320826&v=187839750&s=46dcfa8c1c9ed3539dcc260443df6da08032ee60796f781df237bb6957cb8138"
// $ ffmpeg -i cycloid.mp4 cycloid.wav

#include "ofMain.h"
#include "ofxAudioDecoder.h"

class ofApp : public ofBaseApp {
public:
    ofxAudioDecoder audio;
    ofSoundPlayer sound;
    void setup() {
        ofBackground(0);
        audio.load("cycloid.wav");
        sound.load("cycloid.wav");
        sound.play();
    }
    void draw() {
        int audioFrames = audio.getNumFrames();
        int audioFramesPerVideoFrame = 880;
        int audioFrameOffset = sound.getPosition() * audioFrames;
        if(ofGetMousePressed()) {
            audioFrameOffset = ofMap(mouseX, 0, ofGetWidth(), 0, audioFrames);
        }
        ofMesh mesh;
        mesh.setMode(OF_PRIMITIVE_POINTS);
        auto& samples = audio.getRawSamples();
        for(int i = 0; i < audioFramesPerVideoFrame; i++) {
            int j = 2 * (audioFrameOffset + i);
            j = MIN(j, audio.getNumSamples() - 2);
            mesh.addVertex(ofVec2f(samples[j], samples[j+1]));
        }
        ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2);
        float scale = MIN(ofGetWidth(), ofGetHeight()) / 2;
        ofScale(scale, scale);
        mesh.draw();
    }
};
int main() {
    ofSetupOpenGL(800, 800, OF_FULLSCREEN);
    ofRunApp(new ofApp());
}