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;

	/**
	* AHDSR control signal envelope generator.
	*
	* @author Karl Helgason
	*/
	public final class SoftEnvelopeGenerator implements SoftProcess {

	public final static int EG_OFF = 0;
	public final static int EG_DELAY = 1;
	public final static int EG_ATTACK = 2;
	public final static int EG_HOLD = 3;
	public final static int EG_DECAY = 4;
	public final static int EG_SUSTAIN = 5;
	public final static int EG_RELEASE = 6;
	public final static int EG_SHUTDOWN = 7;
	public final static int EG_END = 8;
	int max_count = 10;
	int used_count = 0;
	private final int[] stage = new int[max_count];
	private final int[] stage_ix = new int[max_count];
	private final double[] stage_v = new double[max_count];
	private final int[] stage_count = new int[max_count];
	private final double[][] on = new double[max_count][1];
	private final double[][] active = new double[max_count][1];
	private final double[][] out = new double[max_count][1];
	private final double[][] delay = new double[max_count][1];
	private final double[][] attack = new double[max_count][1];
	private final double[][] hold = new double[max_count][1];
	private final double[][] decay = new double[max_count][1];
	private final double[][] sustain = new double[max_count][1];
	private final double[][] release = new double[max_count][1];
	private final double[][] shutdown = new double[max_count][1];
	private final double[][] release2 = new double[max_count][1];
	private final double[][] attack2 = new double[max_count][1];
	private final double[][] decay2 = new double[max_count][1];
	private double control_time = 0;

	public void reset() {
	for (int i = 0; i < used_count; i++) {
	stage[i] = 0;
	on[i][0] = 0;
	out[i][0] = 0;
	delay[i][0] = 0;
	attack[i][0] = 0;
	hold[i][0] = 0;
	decay[i][0] = 0;
	sustain[i][0] = 0;
	release[i][0] = 0;
	shutdown[i][0] = 0;
	attack2[i][0] = 0;
	decay2[i][0] = 0;
	release2[i][0] = 0;
	}
	used_count = 0;
	}

	public void init(SoftSynthesizer synth) {
	control_time = 1.0 / synth.getControlRate();
	processControlLogic();
	}

	public double[] get(int instance, String name) {
	if (instance >= used_count)
	used_count = instance + 1;
	if (name == null)
	return out[instance];
	if (name.equals("on"))
	return on[instance];
	if (name.equals("active"))
	return active[instance];
	if (name.equals("delay"))
	return delay[instance];
	if (name.equals("attack"))
	return attack[instance];
	if (name.equals("hold"))
	return hold[instance];
	if (name.equals("decay"))
	return decay[instance];
	if (name.equals("sustain"))
	return sustain[instance];
	if (name.equals("release"))
	return release[instance];
	if (name.equals("shutdown"))
	return shutdown[instance];
	if (name.equals("attack2"))
	return attack2[instance];
	if (name.equals("decay2"))
	return decay2[instance];
	if (name.equals("release2"))
	return release2[instance];

	return null;
	}

	public void processControlLogic() {
	for (int i = 0; i < used_count; i++) {

	if (stage[i] == EG_END)
	continue;

	if ((stage[i] > EG_OFF) && (stage[i] < EG_RELEASE)) {
	if (on[i][0] < 0.5) {
	if (on[i][0] < -0.5) {
	stage_count[i] = (int)(Math.pow(2,
	this.shutdown[i][0] / 1200.0) / control_time);
	if (stage_count[i] < 0)
	stage_count[i] = 0;
	stage_v[i] = out[i][0];
	stage_ix[i] = 0;
	stage[i] = EG_SHUTDOWN;
	} else {
	if ((release2[i][0] < 0.000001) && release[i][0] < 0
	&& Double.isInfinite(release[i][0])) {
	out[i][0] = 0;
	active[i][0] = 0;
	stage[i] = EG_END;
	continue;
	}

	stage_count[i] = (int)(Math.pow(2,
	this.release[i][0] / 1200.0) / control_time);
	stage_count[i]
	+= (int)(this.release2[i][0]/(control_time * 1000));
	if (stage_count[i] < 0)
	stage_count[i] = 0;
	// stage_v[i] = out[i][0];
	stage_ix[i] = 0;

	double m = 1 - out[i][0];
	stage_ix[i] = (int)(stage_count[i] * m);

	stage[i] = EG_RELEASE;
	}
	}
	}

	switch (stage[i]) {
	case EG_OFF:
	active[i][0] = 1;
	if (on[i][0] < 0.5)
	break;
	stage[i] = EG_DELAY;
	stage_ix[i] = (int)(Math.pow(2,
	this.delay[i][0] / 1200.0) / control_time);
	if (stage_ix[i] < 0)
	stage_ix[i] = 0;
	case EG_DELAY:
	if (stage_ix[i] == 0) {
	double attack = this.attack[i][0];
	double attack2 = this.attack2[i][0];

	if (attack2 < 0.000001
	&& (attack < 0 && Double.isInfinite(attack))) {
	out[i][0] = 1;
	stage[i] = EG_HOLD;
	stage_count[i] = (int)(Math.pow(2,
	this.hold[i][0] / 1200.0) / control_time);
	stage_ix[i] = 0;
	} else {
	stage[i] = EG_ATTACK;
	stage_count[i] = (int)(Math.pow(2,
	attack / 1200.0) / control_time);
	stage_count[i] += (int)(attack2 / (control_time * 1000));
	if (stage_count[i] < 0)
	stage_count[i] = 0;
	stage_ix[i] = 0;
	}
	} else
	stage_ix[i]--;
	break;
	case EG_ATTACK:
	stage_ix[i]++;
	if (stage_ix[i] >= stage_count[i]) {
	out[i][0] = 1;
	stage[i] = EG_HOLD;
	} else {
	// CONVEX attack
	double a = ((double)stage_ix[i]) / ((double)stage_count[i]);
	a = 1 + ((40.0 / 96.0) / Math.log(10)) * Math.log(a);
	if (a < 0)
	a = 0;
	else if (a > 1)
	a = 1;
	out[i][0] = a;
	}
	break;
	case EG_HOLD:
	stage_ix[i]++;
	if (stage_ix[i] >= stage_count[i]) {
	stage[i] = EG_DECAY;
	stage_count[i] = (int)(Math.pow(2,
	this.decay[i][0] / 1200.0) / control_time);
	stage_count[i] += (int)(this.decay2[i][0]/(control_time*1000));
	if (stage_count[i] < 0)
	stage_count[i] = 0;
	stage_ix[i] = 0;
	}
	break;
	case EG_DECAY:
	stage_ix[i]++;
	double sustain = this.sustain[i][0] * (1.0 / 1000.0);
	if (stage_ix[i] >= stage_count[i]) {
	out[i][0] = sustain;
	stage[i] = EG_SUSTAIN;
	if (sustain < 0.001) {
	out[i][0] = 0;
	active[i][0] = 0;
	stage[i] = EG_END;
	}
	} else {
	double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
	out[i][0] = (1 - m) + sustain * m;
	}
	break;
	case EG_SUSTAIN:
	break;
	case EG_RELEASE:
	stage_ix[i]++;
	if (stage_ix[i] >= stage_count[i]) {
	out[i][0] = 0;
	active[i][0] = 0;
	stage[i] = EG_END;
	} else {
	double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
	out[i][0] = (1 - m); // *stage_v[i];

	if (on[i][0] < -0.5) {
	stage_count[i] = (int)(Math.pow(2,
	this.shutdown[i][0] / 1200.0) / control_time);
	if (stage_count[i] < 0)
	stage_count[i] = 0;
	stage_v[i] = out[i][0];
	stage_ix[i] = 0;
	stage[i] = EG_SHUTDOWN;
	}

	// re-damping
	if (on[i][0] > 0.5) {
	sustain = this.sustain[i][0] * (1.0 / 1000.0);
	if (out[i][0] > sustain) {
	stage[i] = EG_DECAY;
	stage_count[i] = (int)(Math.pow(2,
	this.decay[i][0] / 1200.0) / control_time);
	stage_count[i] +=
	(int)(this.decay2[i][0]/(control_time*1000));
	if (stage_count[i] < 0)
	stage_count[i] = 0;
	m = (out[i][0] - 1) / (sustain - 1);
	stage_ix[i] = (int) (stage_count[i] * m);
	}
	}

	}
	break;
	case EG_SHUTDOWN:
	stage_ix[i]++;
	if (stage_ix[i] >= stage_count[i]) {
	out[i][0] = 0;
	active[i][0] = 0;
	stage[i] = EG_END;
	} else {
	double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
	out[i][0] = (1 - m) * stage_v[i];
	}
	break;
	default:
	break;
	}
	}

	}
	}

Back to index...