Back to index...

	/*
	* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package com.sun.media.sound;

	import java.util.Arrays;

	/**
	* A chorus effect made using LFO and variable delay. One for each channel
	* (left,right), with different starting phase for stereo effect.
	*
	* @author Karl Helgason
	*/
	public final class SoftChorus implements SoftAudioProcessor {

	private static class VariableDelay {

	private final float[] delaybuffer;
	private int rovepos = 0;
	private float gain = 1;
	private float rgain = 0;
	private float delay = 0;
	private float lastdelay = 0;
	private float feedback = 0;

	VariableDelay(int maxbuffersize) {
	delaybuffer = new float[maxbuffersize];
	}

	public void setDelay(float delay) {
	this.delay = delay;
	}

	public void setFeedBack(float feedback) {
	this.feedback = feedback;
	}

	public void setGain(float gain) {
	this.gain = gain;
	}

	public void setReverbSendGain(float rgain) {
	this.rgain = rgain;
	}

	public void processMix(float[] in, float[] out, float[] rout) {
	float gain = this.gain;
	float delay = this.delay;
	float feedback = this.feedback;

	float[] delaybuffer = this.delaybuffer;
	int len = in.length;
	float delaydelta = (delay - lastdelay) / len;
	int rnlen = delaybuffer.length;
	int rovepos = this.rovepos;

	if (rout == null)
	for (int i = 0; i < len; i++) {
	float r = rovepos - (lastdelay + 2) + rnlen;
	int ri = (int) r;
	float s = r - ri;
	float a = delaybuffer[ri % rnlen];
	float b = delaybuffer[(ri + 1) % rnlen];
	float o = a * (1 - s) + b * (s);
	out[i] += o * gain;
	delaybuffer[rovepos] = in[i] + o * feedback;
	rovepos = (rovepos + 1) % rnlen;
	lastdelay += delaydelta;
	}
	else
	for (int i = 0; i < len; i++) {
	float r = rovepos - (lastdelay + 2) + rnlen;
	int ri = (int) r;
	float s = r - ri;
	float a = delaybuffer[ri % rnlen];
	float b = delaybuffer[(ri + 1) % rnlen];
	float o = a * (1 - s) + b * (s);
	out[i] += o * gain;
	rout[i] += o * rgain;
	delaybuffer[rovepos] = in[i] + o * feedback;
	rovepos = (rovepos + 1) % rnlen;
	lastdelay += delaydelta;
	}
	this.rovepos = rovepos;
	lastdelay = delay;
	}

	public void processReplace(float[] in, float[] out, float[] rout) {
	Arrays.fill(out, 0);
	Arrays.fill(rout, 0);
	processMix(in, out, rout);
	}
	}

	private static class LFODelay {

	private double phase = 1;
	private double phase_step = 0;
	private double depth = 0;
	private VariableDelay vdelay;
	private final double samplerate;
	private final double controlrate;

	LFODelay(double samplerate, double controlrate) {
	this.samplerate = samplerate;
	this.controlrate = controlrate;
	// vdelay = new VariableDelay((int)(samplerate*4));
	vdelay = new VariableDelay((int) ((this.depth + 10) * 2));

	}

	public void setDepth(double depth) {
	this.depth = depth * samplerate;
	vdelay = new VariableDelay((int) ((this.depth + 10) * 2));
	}

	public void setRate(double rate) {
	double g = (Math.PI * 2) * (rate / controlrate);
	phase_step = g;
	}

	public void setPhase(double phase) {
	this.phase = phase;
	}

	public void setFeedBack(float feedback) {
	vdelay.setFeedBack(feedback);
	}

	public void setGain(float gain) {
	vdelay.setGain(gain);
	}

	public void setReverbSendGain(float rgain) {
	vdelay.setReverbSendGain(rgain);
	}

	public void processMix(float[] in, float[] out, float[] rout) {
	phase += phase_step;
	while(phase > (Math.PI * 2)) phase -= (Math.PI * 2);
	vdelay.setDelay((float) (depth * 0.5 * (Math.cos(phase) + 2)));
	vdelay.processMix(in, out, rout);
	}

	public void processReplace(float[] in, float[] out, float[] rout) {
	phase += phase_step;
	while(phase > (Math.PI * 2)) phase -= (Math.PI * 2);
	vdelay.setDelay((float) (depth * 0.5 * (Math.cos(phase) + 2)));
	vdelay.processReplace(in, out, rout);

	}
	}
	private boolean mix = true;
	private SoftAudioBuffer inputA;
	private SoftAudioBuffer left;
	private SoftAudioBuffer right;
	private SoftAudioBuffer reverb;
	private LFODelay vdelay1L;
	private LFODelay vdelay1R;
	private float rgain = 0;
	private boolean dirty = true;
	private double dirty_vdelay1L_rate;
	private double dirty_vdelay1R_rate;
	private double dirty_vdelay1L_depth;
	private double dirty_vdelay1R_depth;
	private float dirty_vdelay1L_feedback;
	private float dirty_vdelay1R_feedback;
	private float dirty_vdelay1L_reverbsendgain;
	private float dirty_vdelay1R_reverbsendgain;
	private float controlrate;

	public void init(float samplerate, float controlrate) {
	this.controlrate = controlrate;
	vdelay1L = new LFODelay(samplerate, controlrate);
	vdelay1R = new LFODelay(samplerate, controlrate);
	vdelay1L.setGain(1.0f); // %
	vdelay1R.setGain(1.0f); // %
	vdelay1L.setPhase(0.5 * Math.PI);
	vdelay1R.setPhase(0);

	globalParameterControlChange(new int[]{0x01 * 128 + 0x02}, 0, 2);
	}

	public void globalParameterControlChange(int[] slothpath, long param,
	long value) {
	if (slothpath.length == 1) {
	if (slothpath[0] == 0x01 * 128 + 0x02) {
	if (param == 0) { // Chorus Type
	switch ((int)value) {
	case 0: // Chorus 1 0 (0%) 3 (0.4Hz) 5 (1.9ms) 0 (0%)
	globalParameterControlChange(slothpath, 3, 0);
	globalParameterControlChange(slothpath, 1, 3);
	globalParameterControlChange(slothpath, 2, 5);
	globalParameterControlChange(slothpath, 4, 0);
	break;
	case 1: // Chorus 2 5 (4%) 9 (1.1Hz) 19 (6.3ms) 0 (0%)
	globalParameterControlChange(slothpath, 3, 5);
	globalParameterControlChange(slothpath, 1, 9);
	globalParameterControlChange(slothpath, 2, 19);
	globalParameterControlChange(slothpath, 4, 0);
	break;
	case 2: // Chorus 3 8 (6%) 3 (0.4Hz) 19 (6.3ms) 0 (0%)
	globalParameterControlChange(slothpath, 3, 8);
	globalParameterControlChange(slothpath, 1, 3);
	globalParameterControlChange(slothpath, 2, 19);
	globalParameterControlChange(slothpath, 4, 0);
	break;
	case 3: // Chorus 4 16 (12%) 9 (1.1Hz) 16 (5.3ms) 0 (0%)
	globalParameterControlChange(slothpath, 3, 16);
	globalParameterControlChange(slothpath, 1, 9);
	globalParameterControlChange(slothpath, 2, 16);
	globalParameterControlChange(slothpath, 4, 0);
	break;
	case 4: // FB Chorus 64 (49%) 2 (0.2Hz) 24 (7.8ms) 0 (0%)
	globalParameterControlChange(slothpath, 3, 64);
	globalParameterControlChange(slothpath, 1, 2);
	globalParameterControlChange(slothpath, 2, 24);
	globalParameterControlChange(slothpath, 4, 0);
	break;
	case 5: // Flanger 112 (86%) 1 (0.1Hz) 5 (1.9ms) 0 (0%)
	globalParameterControlChange(slothpath, 3, 112);
	globalParameterControlChange(slothpath, 1, 1);
	globalParameterControlChange(slothpath, 2, 5);
	globalParameterControlChange(slothpath, 4, 0);
	break;
	default:
	break;
	}
	} else if (param == 1) { // Mod Rate
	dirty_vdelay1L_rate = (value * 0.122);
	dirty_vdelay1R_rate = (value * 0.122);
	dirty = true;
	} else if (param == 2) { // Mod Depth
	dirty_vdelay1L_depth = ((value + 1) / 3200.0);
	dirty_vdelay1R_depth = ((value + 1) / 3200.0);
	dirty = true;
	} else if (param == 3) { // Feedback
	dirty_vdelay1L_feedback = (value * 0.00763f);
	dirty_vdelay1R_feedback = (value * 0.00763f);
	dirty = true;
	}
	if (param == 4) { // Send to Reverb
	rgain = value * 0.00787f;
	dirty_vdelay1L_reverbsendgain = (value * 0.00787f);
	dirty_vdelay1R_reverbsendgain = (value * 0.00787f);
	dirty = true;
	}

	}
	}
	}

	public void processControlLogic() {
	if (dirty) {
	dirty = false;
	vdelay1L.setRate(dirty_vdelay1L_rate);
	vdelay1R.setRate(dirty_vdelay1R_rate);
	vdelay1L.setDepth(dirty_vdelay1L_depth);
	vdelay1R.setDepth(dirty_vdelay1R_depth);
	vdelay1L.setFeedBack(dirty_vdelay1L_feedback);
	vdelay1R.setFeedBack(dirty_vdelay1R_feedback);
	vdelay1L.setReverbSendGain(dirty_vdelay1L_reverbsendgain);
	vdelay1R.setReverbSendGain(dirty_vdelay1R_reverbsendgain);
	}
	}
	double silentcounter = 1000;

	public void processAudio() {

	if (inputA.isSilent()) {
	silentcounter += 1 / controlrate;

	if (silentcounter > 1) {
	if (!mix) {
	left.clear();
	right.clear();
	}
	return;
	}
	} else
	silentcounter = 0;

	float[] inputA = this.inputA.array();
	float[] left = this.left.array();
	float[] right = this.right == null ? null : this.right.array();
	float[] reverb = rgain != 0 ? this.reverb.array() : null;

	if (mix) {
	vdelay1L.processMix(inputA, left, reverb);
	if (right != null)
	vdelay1R.processMix(inputA, right, reverb);
	} else {
	vdelay1L.processReplace(inputA, left, reverb);
	if (right != null)
	vdelay1R.processReplace(inputA, right, reverb);
	}
	}

	public void setInput(int pin, SoftAudioBuffer input) {
	if (pin == 0)
	inputA = input;
	}

	public void setMixMode(boolean mix) {
	this.mix = mix;
	}

	public void setOutput(int pin, SoftAudioBuffer output) {
	if (pin == 0)
	left = output;
	if (pin == 1)
	right = output;
	if (pin == 2)
	reverb = output;
	}
	}

Back to index...