package com.rfg.synth;

import java.nio.*;

import com.un4seen.bass.BASS;
import com.un4seen.bass.BASS.*;

import android.R.bool;
import android.app.Activity;
import android.os.Bundle;
import android.util.FloatMath;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class RFGSynthActivity extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		// Init Bass
		boolean inited = BASS.BASS_Init(-1, _sampleRate,BASS.BASS_DEVICE_MONO);

		// Events
		Button button = (Button) findViewById(R.id.btn_start);

		button.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				// Start-Button Geklickt
				StartLoopChan();
			}
		});

		// Events
		Button button_stop = (Button) findViewById(R.id.btn_stop);

		button_stop.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				// Stop-Button Geklickt
				BASS.BASS_ChannelStop(loopChannel);
			}
		});
	}

	int loopChannel;
	float theta = 0;
	float angle = 0;
	int _sampleRate = 44100;
	public double frequency = 440.0;

	private void StartLoopChan() {
		// Init Theta
		theta = (float) (Math.PI * frequency * 2) / (float) (_sampleRate);

		// LoopChan

		STREAMPROC streamProc =  new BASS.STREAMPROC() {
			
			@Override
			public int STREAMPROC(int handle, ByteBuffer buffer, int length, Object user) {
			// Set Byte Order to Little Endian !
			buffer.order(null);
				
				// Sine Wave Test (16Bit = 2Bytes for 1Short Value)
				ShortBuffer sbuffer = buffer.asShortBuffer();
				short[] b = new short[length / 2]; // allocate an "short" array for the sample data

				// Sine Init
				double amplitude = Short.MAX_VALUE;

				for (int a = 0; a < b.length; a++) {
					b[a] = (short) ((float)(amplitude * FloatMath.sin(angle)));
					angle += theta;

				}

				sbuffer.put(b); // put the array back into the buffer

				return length;
			}
		};
			
		

		 //Set Buffer Size (default 30ms)
//BASS.BASS_SetConfig(BASS.BASS_CONFIG_DEV_BUFFER, 10);
		loopChannel = BASS.BASS_StreamCreate(_sampleRate, 1,BASS.BASS_SAMPLE_LOOP, streamProc, 0);

		// int err = BASS.BASS_ErrorGetCode();
		BASS.BASS_ChannelPlay(loopChannel, false);

	}


}