1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.common.midi.synth; 18 19 /** 20 * Sawtooth oscillator with an ADSR. 21 */ 22 public class SawVoice extends SynthVoice { 23 private SawOscillator mOscillator; 24 private EnvelopeADSR mEnvelope; 25 26 public SawVoice() { 27 mOscillator = createOscillator(); 28 mEnvelope = new EnvelopeADSR(); 29 } 30 31 protected SawOscillator createOscillator() { 32 return new SawOscillator(); 33 } 34 35 @Override 36 public void noteOn(int noteIndex, int velocity) { 37 super.noteOn(noteIndex, velocity); 38 mOscillator.setPitch(noteIndex); 39 mOscillator.setAmplitude(getAmplitude()); 40 mEnvelope.on(); 41 } 42 43 @Override 44 public void noteOff() { 45 super.noteOff(); 46 mEnvelope.off(); 47 } 48 49 @Override 50 public void setFrequencyScaler(float scaler) { 51 mOscillator.setFrequencyScaler(scaler); 52 } 53 54 @Override 55 public float render() { 56 float output = mOscillator.render() * mEnvelope.render(); 57 return output; 58 } 59 60 @Override 61 public boolean isDone() { 62 return mEnvelope.isDone(); 63 } 64 65 } 66
