131 lines
4.7 KiB
Java
131 lines
4.7 KiB
Java
/*
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* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.media.sound;
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/**
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* LFO control signal generator.
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*
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* @author Karl Helgason
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*/
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public final class SoftLowFrequencyOscillator implements SoftProcess {
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private final int max_count = 10;
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private int used_count = 0;
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private final double[][] out = new double[max_count][1];
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private final double[][] delay = new double[max_count][1];
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private final double[][] delay2 = new double[max_count][1];
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private final double[][] freq = new double[max_count][1];
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private final int[] delay_counter = new int[max_count];
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private final double[] sin_phase = new double[max_count];
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private final double[] sin_stepfreq = new double[max_count];
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private final double[] sin_step = new double[max_count];
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private double control_time = 0;
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private double sin_factor = 0;
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private static final double PI2 = 2.0 * Math.PI;
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public SoftLowFrequencyOscillator() {
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// If sin_step is 0 then sin_stepfreq must be -INF
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for (int i = 0; i < sin_stepfreq.length; i++) {
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sin_stepfreq[i] = Double.NEGATIVE_INFINITY;
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}
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}
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public void reset() {
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for (int i = 0; i < used_count; i++) {
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out[i][0] = 0;
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delay[i][0] = 0;
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delay2[i][0] = 0;
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freq[i][0] = 0;
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delay_counter[i] = 0;
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sin_phase[i] = 0;
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// If sin_step is 0 then sin_stepfreq must be -INF
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sin_stepfreq[i] = Double.NEGATIVE_INFINITY;
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sin_step[i] = 0;
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}
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used_count = 0;
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}
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public void init(SoftSynthesizer synth) {
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control_time = 1.0 / synth.getControlRate();
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sin_factor = control_time * 2 * Math.PI;
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for (int i = 0; i < used_count; i++) {
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delay_counter[i] = (int)(Math.pow(2,
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this.delay[i][0] / 1200.0) / control_time);
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delay_counter[i] += (int)(delay2[i][0] / (control_time * 1000));
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}
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processControlLogic();
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}
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public void processControlLogic() {
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for (int i = 0; i < used_count; i++) {
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if (delay_counter[i] > 0) {
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delay_counter[i]--;
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out[i][0] = 0.5;
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} else {
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double f = freq[i][0];
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if (sin_stepfreq[i] != f) {
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sin_stepfreq[i] = f;
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double fr = 440.0 * Math.exp(
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(f - 6900.0) * (Math.log(2) / 1200.0));
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sin_step[i] = fr * sin_factor;
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}
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/*
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double fr = 440.0 * Math.pow(2.0,
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(freq[i][0] - 6900.0) / 1200.0);
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sin_phase[i] += fr * sin_factor;
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*/
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/*
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sin_phase[i] += sin_step[i];
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while (sin_phase[i] > PI2)
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sin_phase[i] -= PI2;
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out[i][0] = 0.5 + Math.sin(sin_phase[i]) * 0.5;
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*/
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double p = sin_phase[i];
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p += sin_step[i];
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while (p > PI2)
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p -= PI2;
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out[i][0] = 0.5 + Math.sin(p) * 0.5;
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sin_phase[i] = p;
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}
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}
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}
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public double[] get(int instance, String name) {
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if (instance >= used_count)
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used_count = instance + 1;
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if (name == null)
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return out[instance];
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if (name.equals("delay"))
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return delay[instance];
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if (name.equals("delay2"))
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return delay2[instance];
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if (name.equals("freq"))
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return freq[instance];
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return null;
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}
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}
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