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Java example source code file (SoftEnvelopeGenerator.java)

This example Java source code file (SoftEnvelopeGenerator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

eg_attack, eg_decay, eg_delay, eg_end, eg_hold, eg_off, eg_release, eg_shutdown, eg_sustain, softenvelopegenerator, softprocess, string

The SoftEnvelopeGenerator.java Java example source code

/*
 * 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;
            }
        }

    }
}

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