android开发中怎样实现混音

android开发中怎样实现混音

android开发中怎样实现混音，实例代码如下：

[mw_shl_code=java,true]public class MixRunnable implements Runnable {
private MixRecorder context;


private static class RecorderParameter {
// 音频获取源
private static int audioSource = MediaRecorder.AudioSource.MIC;
// 设置音频采样率，44100是目前的标准，但是某些设备仍然支持22050，16000，11025
private static final int sampleRateInHz = 44100;
// 设置音频的录制的声道CHANNEL_IN_STEREO为双声道，CHANNEL_CONFIGURATION_MONO为单声道
private static final int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;
// 音频数据格式:PCM 16位每个样本。保证设备支持。PCM 8位每个样本。不一定能得到设备支持。
private static final int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
// 缓冲区字节大小
private static int bufferSizeInBytes;
}

// 设置运行状态
private boolean isRunning = true;
// AudioRecord对象
private static AudioRecord recorder;
// 设置MediaPlayer对象
private static MediaPlayer mediaPlayer;
// 伴奏文件
private FileInputStream accompany;
// 原唱文件
private FileInputStream original;
// 得分
private int score;
private boolean isFirst = true;


public MixRunnable(MixRecorder context, String accompany, String original) throws FileNotFoundException {
this.context = context;
this.accompany = new FileInputStream(accompany);
this.original = new FileInputStream(original);
creatAudioRecord();
mediaPlayer = new MediaPlayer();
}

@Override
public void run() {
try {
// MediaPlayer准备

mediaPlayer.reset();
mediaPlayer.setDataSource("/sdcard/111.wav");
// mediaPlayer.setDataSource(accompany.getFD());
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

@Override
public void onCompletion(MediaPlayer mp) {
isRunning = false;
}
});
mediaPlayer.prepare();
// 跳过头
accompany.read(new byte[44]);
original.read(new byte[44]);
FileOutputStream fos = new FileOutputStream(new File("/sdcard/love.raw"));
// 开始读
byte[] sourceReader = new byte[RecorderParameter.bufferSizeInBytes * 2];
short[] sourceShortArray;
short[] audioReader = new short[sourceReader.length / 4];
mediaPlayer.start();
recorder.startRecording();
while (isRunning) {
int sourceReadSize = accompany.read(sourceReader, 0, sourceReader.length);
if (sourceReadSize < 0) {
isRunning = false;
continue;
}
sourceShortArray = byteToShortArray(sourceReader, sourceReadSize / 2);
recorder.read(audioReader, 0, audioReader.length);
short[] oneSecond = mixVoice(sourceShortArray, audioReader, sourceReadSize / 2);
byte[] outStream = new byte[oneSecond.length * 2];
for (int i = 0; i < oneSecond.length; i++) {
byte[] b = shortToByteArray(oneSecond);
outStream[2 * i] = b[0];
outStream[2 * i + 1] = b[1];
}