| /* |
| * 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; |
| |
| /** |
| * LFO control signal generator. |
| * |
| * @author Karl Helgason |
| */ |
| public final class SoftLowFrequencyOscillator implements SoftProcess { |
| |
| private final int max_count = 10; |
| private int used_count = 0; |
| private final double[][] out = new double[max_count][1]; |
| private final double[][] delay = new double[max_count][1]; |
| private final double[][] delay2 = new double[max_count][1]; |
| private final double[][] freq = new double[max_count][1]; |
| private final int[] delay_counter = new int[max_count]; |
| private final double[] sin_phase = new double[max_count]; |
| private final double[] sin_stepfreq = new double[max_count]; |
| private final double[] sin_step = new double[max_count]; |
| private double control_time = 0; |
| private double sin_factor = 0; |
| private static final double PI2 = 2.0 * Math.PI; |
| |
| public SoftLowFrequencyOscillator() { |
| // If sin_step is 0 then sin_stepfreq must be -INF |
| for (int i = 0; i < sin_stepfreq.length; i++) { |
| sin_stepfreq[i] = Double.NEGATIVE_INFINITY; |
| } |
| } |
| |
| public void reset() { |
| for (int i = 0; i < used_count; i++) { |
| out[i][0] = 0; |
| delay[i][0] = 0; |
| delay2[i][0] = 0; |
| freq[i][0] = 0; |
| delay_counter[i] = 0; |
| sin_phase[i] = 0; |
| // If sin_step is 0 then sin_stepfreq must be -INF |
| sin_stepfreq[i] = Double.NEGATIVE_INFINITY; |
| sin_step[i] = 0; |
| } |
| used_count = 0; |
| } |
| |
| public void init(SoftSynthesizer synth) { |
| control_time = 1.0 / synth.getControlRate(); |
| sin_factor = control_time * 2 * Math.PI; |
| for (int i = 0; i < used_count; i++) { |
| delay_counter[i] = (int)(Math.pow(2, |
| this.delay[i][0] / 1200.0) / control_time); |
| delay_counter[i] += (int)(delay2[i][0] / (control_time * 1000)); |
| } |
| processControlLogic(); |
| } |
| |
| public void processControlLogic() { |
| for (int i = 0; i < used_count; i++) { |
| if (delay_counter[i] > 0) { |
| delay_counter[i]--; |
| out[i][0] = 0.5; |
| } else { |
| double f = freq[i][0]; |
| |
| if (sin_stepfreq[i] != f) { |
| sin_stepfreq[i] = f; |
| double fr = 440.0 * Math.exp( |
| (f - 6900.0) * (Math.log(2) / 1200.0)); |
| sin_step[i] = fr * sin_factor; |
| } |
| /* |
| double fr = 440.0 * Math.pow(2.0, |
| (freq[i][0] - 6900.0) / 1200.0); |
| sin_phase[i] += fr * sin_factor; |
| */ |
| /* |
| sin_phase[i] += sin_step[i]; |
| while (sin_phase[i] > PI2) |
| sin_phase[i] -= PI2; |
| out[i][0] = 0.5 + Math.sin(sin_phase[i]) * 0.5; |
| */ |
| double p = sin_phase[i]; |
| p += sin_step[i]; |
| while (p > PI2) |
| p -= PI2; |
| out[i][0] = 0.5 + Math.sin(p) * 0.5; |
| sin_phase[i] = p; |
| |
| } |
| } |
| } |
| |
| public double[] get(int instance, String name) { |
| if (instance >= used_count) |
| used_count = instance + 1; |
| if (name == null) |
| return out[instance]; |
| if (name.equals("delay")) |
| return delay[instance]; |
| if (name.equals("delay2")) |
| return delay2[instance]; |
| if (name.equals("freq")) |
| return freq[instance]; |
| return null; |
| } |
| } |