/* * Copyright (c) 2007, 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 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 int[] stage = new int[max_count];    private int[] stage_ix = new int[max_count];    private double[] stage_v = new double[max_count];    private int[] stage_count = new int[max_count];    private double[][] on = new double[max_count][1];    private double[][] active = new double[max_count][1];    private double[][] out = new double[max_count][1];    private double[][] delay = new double[max_count][1];    private double[][] attack = new double[max_count][1];    private double[][] hold = new double[max_count][1];    private double[][] decay = new double[max_count][1];    private double[][] sustain = new double[max_count][1];    private double[][] release = new double[max_count][1];    private double[][] shutdown = new double[max_count][1];    private double[][] release2 = new double[max_count][1];    private double[][] attack2 = new double[max_count][1];    private 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;            }        }     }}