package vafusion.inst;
import jm.audio.Instrument;
import jm.audio.io.*;
import jm.audio.synth.*;
import jm.music.data.Note;
import jm.audio.AudioObject;
/**
* A sawtooth waveform instrument implementation
* which includes a low pass filter that is changed by
* the note's velocity.
* @author Andrew Brown
*/
public final class DynamicFilterInst 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.
* @param sampleRate
*/
public DynamicFilterInst(int sampleRate){
this(sampleRate, 200);
}
/**
* Constructor that sets sample rate and cutoff frequency in hertz
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
*/
public DynamicFilterInst(int sampleRate, int filterCutoff){
this(sampleRate, filterCutoff, 300, 1);
}
/**
* Constructor that sets sample rate, cutoff and scaling factor for mod source
* @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 DynamicFilterInst(int sampleRate, int filterCutoff, double dynScale){
this(sampleRate, filterCutoff, dynScale, 1);
}
/**
* Constructor that sets all attributes
* @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 DynamicFilterInst(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.
*/
@Override
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});
SampleOut sout = new SampleOut(env);
}
}