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50 lines
1.5 KiB
50 lines
1.5 KiB
/*
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* Copyright 2010 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.levien.synthesizer.core.model.modules;
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import com.levien.synthesizer.core.model.SignalProvider;
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import com.levien.synthesizer.core.model.SynthesisTime;
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/**
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* Amplifier simply multiplies the input signal by the input gain.
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*/
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public class Amplifier implements SignalProvider {
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/**
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* Creates a new Amplifier with the given signal and gain.
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* @param inputSignal - Any input signal.
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* @param gain - The signal it's multiplied times.
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*/
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public Amplifier(SignalProvider inputSignal, SignalProvider gain) {
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inputSignal_ = inputSignal;
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gain_ = gain;
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}
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/**
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* Returns signal * gain.
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*/
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public double getValue(SynthesisTime time) {
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// Most of the time, the gain will be 0.0 because of some envelope. So this is an optimization.
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double gain = gain_.getValue(time);
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if (gain == 0.0) {
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return 0.0;
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}
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return inputSignal_.getValue(time) * gain;
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}
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private SignalProvider inputSignal_;
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private SignalProvider gain_;
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}
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