Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright {2014} {Matsuda Jumpei}
 * 
 * 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.
 */

import android.media.AudioTrack;

public class Main {
    public static void addSound(AudioTrack track, int samplingRate, float freq) {
        track.write(convertFreq2Bytes(freq, samplingRate), 0, samplingRate);
    }

    public static byte[] convertFreq2Bytes(float freq, int samplingRate) {
        byte[] bytes = new byte[samplingRate];

        for (int i = 0; i < samplingRate; i++) {
            //            double phase = calcPhase(i, freq, samplingRate);
            //            bytes[i] = (byte) (128 * (Math.sin(phase)));
            bytes[i] = generateSample(i, freq, samplingRate);
        }

        return bytes;
    }

    private static byte generateSample(int step, float freq, int samplingRate) {
        double phase4 = calcPhase(step, freq * 0.08f, samplingRate);
        return (byte) (60 * (Math.sin(phase4)));
    }

    private static double calcPhase(int step, float freq, int samplingRate) {
        return Math.PI * step * freq / samplingRate;
    }
}