| 使用AudioTrack来播放pcm数据，发现播放出来的声音是吱吱的那种杂音。这是怎么回事呢？ 没有出现录的声音 |
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public class AudioPlayerDemoActivity extends Activity implements OnClickListener{
/** Called when the activity is first created. */
private TextView mTextViewState; // 播放状态
private Button mBtnPlayButton; // 播放
private Button mBtnPauseButton; // 暂停
private Button mBtnStopButton; // 停止
private AudioPlayer mAudioPlayer; // 播放器
private Handler mHandler;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initView();
initLogic();
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
mAudioPlayer.release();
}
public void initView()
{
mTextViewState = (TextView) findViewById(R.id.tvPlayState);
mBtnPlayButton = (Button) findViewById(R.id.buttonPlay);
mBtnPlayButton.setOnClickListener(this);
mBtnPauseButton = (Button) findViewById(R.id.buttonPause);
mBtnPauseButton.setOnClickListener(this);
mBtnStopButton = (Button) findViewById(R.id.buttonStop);
mBtnStopButton.setOnClickListener(this);
}
public void initLogic()
{
mHandler = new Handler()
{
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch(msg.what)
{
case AudioPlayer.STATE_MSG_ID:
showState((Integer)msg.obj);
break;
}
}
};
mAudioPlayer = new AudioPlayer(mHandler);
// 获取音频参数
AudioParam audioParam = getAudioParam();
mAudioPlayer.setAudioParam(audioParam);
// 获取音频数据
byte[] data = getPCMData();
mAudioPlayer.setDataSource(data);
// 音频源就绪
mAudioPlayer.prepare();
if (data == null)
{
mTextViewState.setText(filePath + "：该路径下不存在文件！");
}
}
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
switch(view.getId())
{
case R.id.buttonPlay:
play();
break;
case R.id.buttonPause:
pause();
break;
case R.id.buttonStop:
stop();
break;
}
}
public void play()
{
mAudioPlayer.play();
}
public void pause()
{
mAudioPlayer.pause();
}
public void stop()
{
mAudioPlayer.stop();
}
public void showState(int state)
{
String showString = "";
switch(state)
{
case PlayState.MPS_UNINIT:
showString = "MPS_UNINIT";
break;
case PlayState.MPS_PREPARE:
showString = "MPS_PREPARE";
break;
case PlayState.MPS_PLAYING:
showString = "MPS_PLAYING";
break;
case PlayState.MPS_PAUSE:
showString = "MPS_PAUSE";
break;
}
showState(showString);
}
public void showState(String str)
{
mTextViewState.setText(str);
}
/*
* 获得PCM音频数据参数
*/
public AudioParam getAudioParam()
{
AudioParam audioParam = new AudioParam();
audioParam.mFrequency = 44100;
audioParam.mChannel = AudioFormat.CHANNEL_CONFIGURATION_STEREO;
audioParam.mSampBit = AudioFormat.ENCODING_PCM_16BIT;
return audioParam;
}
String filePath = Environment.getExternalSt
4000
orageDirectory().getAbsolutePath() + "/testmusic.pcm";
/*
* 获得PCM音频数据
*/
public byte[] getPCMData()
{
File file = new File(filePath);
if (file == null){
return null;
}
FileInputStream inStream;
try {
inStream = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}
byte[] data_pack = null;
if (inStream != null){
long size = file.length();
data_pack = new byte[(int) size];
try {
inStream.read(data_pack);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
return data_pack;
}
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