content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.example.android.common.midi.synth;
  
  /**
   * Sawtooth oscillator with an ADSR.
   */
  public class SawVoice extends SynthVoice {
      private SawOscillator mOscillator;
      private EnvelopeADSR mEnvelope;
  
      public SawVoice() {
          mOscillator = createOscillator();
          mEnvelope = new EnvelopeADSR();
      }
  
      protected SawOscillator createOscillator() {
          return new SawOscillator();
      }
  
      @Override
      public void noteOn(int noteIndex, int velocity) {
          super.noteOn(noteIndex, velocity);
          mOscillator.setPitch(noteIndex);
          mOscillator.setAmplitude(getAmplitude());
          mEnvelope.on();
      }
  
      @Override
      public void noteOff() {
          super.noteOff();
          mEnvelope.off();
      }
  
      @Override
      public void setFrequencyScaler(float scaler) {
          mOscillator.setFrequencyScaler(scaler);
      }
  
      @Override
      public float render() {
          float output = mOscillator.render() * mEnvelope.render();
          return output;
      }
  
      @Override
      public boolean isDone() {
          return mEnvelope.isDone();
      }
  
  }
  