使用 AudioRecord 录制音频
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【中文标题】使用 AudioRecord 录制音频【英文标题】：Audio recording using AudioRecord 【发布时间】：2015-01-08 18:34:37 【问题描述】：我决定使用AudioRecord 而不是MediaRecorder 录制音频，以达到最高质量。问题是，该应用程序由于某种原因无法运行。有2个按钮：录制和播放，录制用于开始和停止录制（使用新线程），播放应该使用MediaPlayer播放文件。
代码：
public class MyActivity extends Activity
AudioRecord recorder = null;
int SAMPLE_RATE = 44100;
int ENCODING = AudioFormat.ENCODING_PCM_16BIT;
int SOURCE = MediaRecorder.Audiosource.MIC;
int CONFIG = AudioFormat.CHANNEL_IN_MONO;
int BUFFER_SIZE;
boolean isRecording = false;
boolean isPlaying = false;
String currentFileDir;
byte[] b;
File file;
OutputStream FOS;
int count =0;
MediaPlayer mediaPlayer;
Thread recordThread;
private Button recordButton;
private Button playButton;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
currentFileDir = getFilesDir().getAbsolutePath() + "Record.pcm";
recordButton = (Button)findViewById(R.id.RecordButton);
recordButton.setOnClickListener(new MyOCL());
playButton = (Button)findViewById(R.id.PlayButton);
playButton.setOnClickListener(new MyOCL());
protected void record()
file = new File(currentFileDir);
BUFFER_SIZE = AudioRecord.getMinBufferSize(SAMPLE_RATE, CONFIG, ENCODING);
recorder = new AudioRecord(SOURCE, SAMPLE_RATE, CONFIG, ENCODING, BUFFER_SIZE);
isRecording = true;
b = new byte[BUFFER_SIZE];
try
FOS = new FileOutputStream(file);
catch (Exception e)Log.e("Open FOS", "new failed");
while (isRecording)
recorder.read(b, 0, BUFFER_SIZE);
try
FOS.write(b, count * BUFFER_SIZE, BUFFER_SIZE);
count++;
catch (Exception e)Log.e("write FOS", "write failed");
try
FOS.close();
catch (Exception e)Log.e("close FOS", "close failed");
private class MyOCL implements View.OnClickListener
@Override
public void onClick(View view)
switch(view.getId())
case R.id.PlayButton:
if(isPlaying == false)
playButton.setText("Stop Playing");
setPlaying();
mediaPlayer.start();
else
playButton.setText("Start Playing");
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer.reset();
break;
case R.id.RecordButton:
if(isRecording == false)
recordThread = new Thread(new Runnable()
@Override
public void run()
record();
);
recordThread.start();
recordButton.setText("Stop Recording");
else
recordButton.setText("Start recording");
isRecording = false;
break;
protected void setPlaying()
try
mediaPlayer = new MediaPlayer();
mediaPlayer.reset();
mediaPlayer.setDataSource(currentFileDir);
mediaPlayer.prepare();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
//mediaPlayer.start();
catch (Exception e)
Log.e("Play initialize", "Can't call prepare function" + e.getMessage());
@Override
public boolean onCreateOptionsMenu(Menu menu)
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my, menu);
return true;
@Override
public boolean onOptionsItemSelected(MenuItem item)
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in androidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings)
return true;
return super.onOptionsItemSelected(item);
【问题讨论】：
您应该提供有关“应用程序无法正常工作”的详细信息 由于某种原因，该文件没有被保存。稍后我会添加一些日志，但问题在于似乎无限的 while(isRecording) 循环。 【参考方案1】：这是我的代码，对我有用：
public class MainActivity extends Activity
AudioRecord record = null;
AudioTrack track = null;
boolean isRecording;
int sampleRate = 44100;
Button startRecord, stopRecord, playRecord = null;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setVolumeControlStream(AudioManager.MODE_IN_COMMUNICATION);
startRecord = (Button) findViewById(R.id.start_recording);
stopRecord = (Button) findViewById(R.id.stop_recording);
playRecord = (Button) findViewById(R.id.play_recording);
startRecord.setOnClickListener(new StartRecordListener());
stopRecord.setOnClickListener(new StopRecordListener());
playRecord.setOnClickListener(new PlayRecordListener());
stopRecord.setEnabled(false);
private void startRecord()
File recordFile = new File(Environment.getExternalStorageDirectory(), "Record.pcm");
try
recordFile.createNewFile();
OutputStream outputStream = new FileOutputStream(recordFile);
BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);
DataOutputStream dataOutputStream = new DataOutputStream(bufferedOutputStream);
int minBufferSize = AudioRecord.getMinBufferSize(sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
short[] audioData = new short[minBufferSize];
record = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT,
minBufferSize);
record.startRecording();
while (isRecording)
int numberOfShort = record.read(audioData, 0, minBufferSize);
for (int i = 0; i < numberOfShort; i++)
dataOutputStream.writeShort(audioData[i]);
record.stop();
dataOutputStream.close();
catch (IOException e)
e.printStackTrace();
public void playRecord()
File recordFile = new File(Environment.getExternalStorageDirectory(), "Record.pcm");
int shortSizeInBytes = Short.SIZE / Byte.SIZE;
int bufferSizeInBytes = (int) (recordFile.length() / shortSizeInBytes);
short[] audioData = new short[bufferSizeInBytes];
try
InputStream inputStream = new FileInputStream(recordFile);
BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
DataInputStream dataInputStream = new DataInputStream(bufferedInputStream);
int i = 0;
while (dataInputStream.available() > 0)
audioData[i] = dataInputStream.readShort();
i++;
dataInputStream.close();
track = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT,
bufferSizeInBytes, AudioTrack.MODE_STREAM);
track.play();
track.write(audioData, 0, bufferSizeInBytes);
catch (FileNotFoundException e)
e.printStackTrace();
catch (IOException e)
e.printStackTrace();
public class StartRecordListener implements View.OnClickListener
@Override
public void onClick(View v)
Thread recordThread = new Thread(new Runnable()
@Override
public void run()
isRecording = true;
MainActivity.this.startRecord();
);
recordThread.start();
startRecord.setEnabled(false);
stopRecord.setEnabled(true);
public class StopRecordListener implements View.OnClickListener
@Override
public void onClick(View v)
isRecording = false;
startRecord.setEnabled(true);
stopRecord.setEnabled(false);
public class PlayRecordListener implements View.OnClickListener
@Override
public void onClick(View v)
MainActivity.this.playRecord();
XML 布局包含 3 个具有以下 ID 的按钮：start_recording、stop_recording、play_recording
并添加以下权限：
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
祝你好运，我希望你没问题，我在上面的代码中使用了 3 个按钮。
【讨论】：
非常感谢！我来看看代码。我看到你使用了短裤并将它们解析为字节......这是为什么呢？ 您可以将 record.read() 给出的字节直接存储到您的输出流中。 那么有什么解释为什么当我用 OutputStream（而不是中间的缓冲区）初始化 DataOutputStream 时，音频要快得多？ （我认为比现实快 2 倍） 对不起，我不明白你的意思。您可以尝试上面的示例并对其进行测量。 我试过了，效果很好，我只是想知道是什么原因造成的以上是关于使用 AudioRecord 录制音频的主要内容，如果未能解决你的问题，请参考以下文章
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