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package com.sun.media.sound;

AHDSR control signal envelope generator.
Author:Karl Helgason
/** * 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; } } } }