AudioRecord录音代码实例

package com.Javen; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import android.app.Activity; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaPlayer; import android.media.MediaPlayer.OnPreparedListener; import android.media.MediaRecorder; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class AudioRecordActivity extends Activity { private static final String TAG = "AudioRecordActivity"; private Button startButton, stopButton, playButton; private int bufferSizeInBytes = 0;//缓冲区大小 //音频获取来源 private int audioSource = MediaRecorder.AudioSource.MIC; //设置音频的采样率，44100是目前的标准，但是某些设备仍然支持22050,16000,11025 private static int sampleRateInHz = 44100; //设置音频的录制声道，CHANNEL_IN_STEREO为双声道，CHANNEL_CONFIGURATION_MONO为单声道 private static int channelConfig = AudioFormat.CHANNEL_IN_STEREO; //设置音频数据格式:PCM 16位每个样本，保证设备支持。PCM 8位每个样本，不一定能得到设备的支持。 private static int audioFormat = AudioFormat.ENCODING_PCM_16BIT; //AudioName裸音频数据文件 private static final String AudioName = "/sdcard/love.raw"; //NewAudioName可播放的音频文件 private static final String NewAudioName = "/sdcard/new.wav"; private AudioRecord audioRecord; //播放音频 private MediaPlayer mediaPlayer; private boolean isRecord = false;//设置录制状态 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private void init() { startButton = (Button)findViewById(R.id.startButton); stopButton = (Button)findViewById(R.id.stopButton); playButton = (Button)findViewById(R.id.playButton); creatAudioRecord(); startButton.setOnClickListener(new AudioRecordLinstener()); stopButton.setOnClickListener(new AudioRecordLinstener()); playButton.setOnClickListener(new AudioRecordLinstener()); } private void creatAudioRecord() { //根据AudioRecord的音频采样率、音频录制声道、音频数据格式获取缓冲区大小 bufferSizeInBytes = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat); Log.d(TAG, "creatAudioRecord-->bufferSizeInBytes="+bufferSizeInBytes); //根据音频获取来源、音频采用率、音频录制声道、音频数据格式和缓冲区大小来创建AudioRecord对象 audioRecord = new AudioRecord(audioSource, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes); //创建播放实例 mediaPlayer = new MediaPlayer(); } class AudioRecordLinstener implements OnClickListener { @Override public void onClick(View v) { if(v == startButton) { startAudioRecord(); } if(v == stopButton) { stopAudioRecord(); } if(v == playButton) { playMusic(); } } } private final class PrepareListener implements OnPreparedListener { @Override public void onPrepared(MediaPlayer mp) { // TODO Auto-generated method stub mediaPlayer.start();//开始播放 } } /** * 播放录制的音频 */ private void playMusic() { File file = new File(NewAudioName); if(file.exists()) { try { mediaPlayer.reset(); mediaPlayer.setDataSource(NewAudioName); mediaPlayer.prepare();//进行数据缓冲 mediaPlayer.setOnPreparedListener(new PrepareListener()); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /** * 开始录制音频 */ private void startAudioRecord() { audioRecord.startRecording();//开始录制 isRecord = true; new AudioRecordThread().start();//开启线程来把录制的音频数据保留下来 } /** * 停止录制音频 */ private void stopAudioRecord() { close(); } private void close() { if (audioRecord != null) { System.out.println("stopRecord"); isRecord = false;//停止文件写入 audioRecord.stop(); audioRecord.release();//释放资源 audioRecord = null; } } /** * 音频数据写入线程 * @author Administrator * */ class AudioRecordThread extends Thread { @Override public void run() { super.run(); writeDataToFile();//把录制的音频裸数据写入到文件中去 copyWaveFile(AudioName, NewAudioName);//给裸数据加上头文件 } } /** * 把录制的音频裸数据写入到文件中去 * 这里将数据写入文件，但是并不能播放，因为AudioRecord获得的音频是原始的裸音频， * 如果需要播放就必须加入一些格式或者编码的头信息。但是这样的好处就是你可以对音频的 裸数据进行处理，比如你要做一个爱说话的TOM * 猫在这里就进行音频的处理，然后重新封装 所以说这样得到的音频比较容易做一些音频的处理。 */ private void writeDataToFile() { // new一个byte数组用来存一些字节数据，大小为缓冲区大小 byte[] audioData = new byte[bufferSizeInBytes]; int readSize = 0; FileOutputStream fos = null; File file = new File(AudioName); if(file.exists()) file.delete(); try { fos = new FileOutputStream(file);//获取一个文件的输出流 } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } while(isRecord == true) { readSize = audioRecord.read(audioData, 0, bufferSizeInBytes); Log.d(TAG, "readSize ="+readSize); if(AudioRecord.ERROR_INVALID_OPERATION != readSize) { try { fos.write(audioData); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } try { fos.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } private void copyWaveFile(String inFileName, String outFileName) { FileInputStream in = null; FileOutputStream out = null; long totalAudioLen = 0; long totalDataLen = totalAudioLen + 36; long longSampleRate = sampleRateInHz; int channels = 2; long byteRate = 16 * sampleRateInHz * channels / 8; byte[] data = new byte[bufferSizeInBytes]; try { in = new FileInputStream(inFileName); out = new FileOutputStream(outFileName); totalAudioLen = in.getChannel().size(); totalDataLen = totalAudioLen + 36; WriteWaveFileHeader(out, totalAudioLen, totalDataLen, longSampleRate, channels, byteRate); while(in.read(data) != -1) { out.write(data); } in.close(); out.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 这里提供一个头信息。插入这些信息就可以得到可以播放的文件。 * 为我为啥插入这44个字节，这个还真没深入研究，不过你随便打开一个wav * 音频的文件，可以发现前面的头文件可以说基本一样哦。每种格式的文件都有 * 自己特有的头文件。 */ private void WriteWaveFileHeader(FileOutputStream out, long totalAudioLen, long totalDataLen, long longSampleRate, int channels, long byteRate) throws IOException {