import jm.audio.AudioObject;
import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;
/**
* A sawtooth waveform instrument implementation
* which iincludes a low pass filter that is changed by
* the note's velocity.
*
* @author Andrew Brown
*/
public final class SawLPFInstB extends Instrument {
//----------------------------------------------
// Attributes
//----------------------------------------------
private int sampleRate;
private int filterCutoff;
private int channels;
private double dynScale;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate and buffersize in addition
* to the neccessary frequency relationships
* and volumes for each frequency to be added
* the instrument
*
* @param sampleRate
*/
public SawLPFInstB(int sampleRate) {
this(sampleRate, 200, 160, 1);
}
/**
* Constructor that sets sample rate and the number of channels
*
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
*/
public SawLPFInstB(int sampleRate, int filterCutoff) {
this(sampleRate, filterCutoff, 160, 1);
}
/**
* Constructor that sets sample rate and the number of channels
*
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
* @param dynScale The amount to multiply the dynamic value by in
* order for it change the filter cutoff
*/
public SawLPFInstB(int sampleRate, int filterCutoff, double dynScale) {
this(sampleRate, filterCutoff, dynScale, 1);
}
/**
* Constructor that sets sample rate and the number of channels
*
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
* @param channels 1 for Mono or 2 for Stereo
*/
public SawLPFInstB(int sampleRate, int filterCutoff, double dynScale, int channels) {
this.sampleRate = sampleRate;
this.filterCutoff = filterCutoff;
this.dynScale = dynScale;
this.channels = channels;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build the objects that
* this instrument will use and specify thier interconnections.
*/
public void createChain() {
Value modSource = new Value(this, this.sampleRate, 1, Value.NOTE_DYNAMIC);
Value modAmount = new Value(this, this.sampleRate, 1, (float) this.dynScale);
Multiply filterControl = new Multiply(new AudioObject[]{modSource, modAmount});
Oscillator wave = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
Filter filt = new Filter(new AudioObject[]{wave, filterControl}, this.filterCutoff, Filter.LOW_PASS);
Envelope env = new Envelope(filt,
new double[]{0.0, 0.0, 0.05, 1.0, 0.2, 0.4, 0.8, 0.3, 1.0, 0.0});
Volume vol = new Volume(env);
SampleOut sout = new SampleOut(vol);
}
}