Metronome.java

package com.pntanasis.android.metronome;

import android.os.Handler;
import android.os.Message;

public class Metronome {
	
	private double bpm;
	private int beat;
	private int noteValue;
	private int silence;

	private double beatSound;
	private double sound;
	private final int tick = 1000; // samples of tick
	
	private boolean play = true;
	
	private AudioGenerator audioGenerator = new AudioGenerator(8000);
	private Handler mHandler;
	private double[] soundTickArray;
	private double[] soundTockArray;
	private double[] silenceSoundArray;
	private Message msg;
	private int currentBeat = 1;
	
	public Metronome(Handler handler) {
		audioGenerator.createPlayer();
		this.mHandler = handler;
	}
	
	public void calcSilence() {
		silence = (int) (((60/bpm)*8000)-tick);		
		soundTickArray = new double[this.tick];	
		soundTockArray = new double[this.tick];
		silenceSoundArray = new double[this.silence];
		msg = new Message();
		msg.obj = ""+currentBeat;
		double[] tick = audioGenerator.getSineWave(this.tick, 8000, beatSound);
		double[] tock = audioGenerator.getSineWave(this.tick, 8000, sound);
		for(int i=0;i<this.tick;i++) {
			soundTickArray[i] = tick[i];
			soundTockArray[i] = tock[i];
		}
		for(int i=0;i<silence;i++)
			silenceSoundArray[i] = 0;
	}
	
	public void play() {
		calcSilence();
		do {
			msg = new Message();
			msg.obj = ""+currentBeat;
			if(currentBeat == 1)
				audioGenerator.writeSound(soundTockArray);
			else
				audioGenerator.writeSound(soundTickArray);				
			if(bpm <= 120)
				mHandler.sendMessage(msg);
			audioGenerator.writeSound(silenceSoundArray);
			if(bpm > 120)
				mHandler.sendMessage(msg);
			currentBeat++;
			if(currentBeat > beat)
				currentBeat = 1;
		} while(play);
	}
	
	public void stop() {
		play = false;
		audioGenerator.destroyAudioTrack();
	}

	public double getBpm() {
		return bpm;
	}

	public void setBpm(int bpm) {
		this.bpm = bpm;
	}

	public int getNoteValue() {
		return noteValue;
	}

	public void setNoteValue(int bpmetre) {
		this.noteValue = bpmetre;
	}

	public int getBeat() {
		return beat;
	}

	public void setBeat(int beat) {
		this.beat = beat;
	}

	public double getBeatSound() {
		return beatSound;
	}

	public void setBeatSound(double sound1) {
		this.beatSound = sound1;
	}

	public double getSound() {
		return sound;
	}

	public void setSound(double sound2) {
		this.sound = sound2;
	}

}