| /* |
| * 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 org.drrickorang.loopback; |
| |
| |
| /** |
| * This class generates a sine wave with given frequency and samplingRate. |
| * It keeps a member variable "mPhase", so as it continually be called, it will continue to generate |
| * the next section of the sine wave. |
| */ |
| |
| public class SineWaveTone extends ToneGeneration { |
| private int mCount; // counts the total samples produced. |
| private double mPhase; // current phase |
| private final double mPhaseIncrement; // phase incrementation associated with mFrequency |
| |
| |
| public SineWaveTone(int samplingRate, double frequency) { |
| super(samplingRate); |
| mCount = 0; |
| mPhaseIncrement = Constant.TWO_PI * (frequency / mSamplingRate); // should < 2pi |
| mAmplitude = Constant.SINE_WAVE_AMPLITUDE; |
| } |
| |
| |
| @Override |
| public void generateTone(short[] tone, int size) { |
| for (int i = 0; i < size; i++) { |
| short value1 = (short) (mAmplitude * Math.sin(mPhase) * Short.MAX_VALUE); |
| tone[i] = value1; |
| |
| mPhase += mPhaseIncrement; |
| // insert glitches if mIsGlitchEnabled == true, and insert it for every second |
| if (mIsGlitchEnabled & (mCount % mSamplingRate == 0)) { |
| mPhase += mPhaseIncrement; |
| } |
| |
| mCount++; |
| |
| if (mPhase >= Constant.TWO_PI) { |
| mPhase -= Constant.TWO_PI; |
| } |
| } |
| } |
| |
| |
| @Override |
| public void generateTone(double[] tone, int size) { |
| for (int i = 0; i < size; i++) { |
| double value1 = mAmplitude * Math.sin(mPhase); |
| tone[i] = value1; |
| |
| mPhase += mPhaseIncrement; |
| // insert glitches if mIsGlitchEnabled == true, and insert it for every second |
| if (mIsGlitchEnabled & (mCount % mSamplingRate == 0)) { |
| mPhase += mPhaseIncrement; |
| } |
| |
| mCount++; |
| |
| if (mPhase >= Constant.TWO_PI) { |
| mPhase -= Constant.TWO_PI; |
| } |
| } |
| } |
| |
| |
| @Override |
| public void resetPhases() { |
| mPhase = 0; |
| } |
| |
| } |