Android MediaRecorder与AudioRecord音频录制

Android 音频录制

MediaRecorder
AudioRecord

1. MediaRecorder
   需要的权限

  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  <uses-permission android:name="android.permission.RECORD_AUDIO" />

  /**   * 开始录音   */  class startRecordListener implements OnClickListener {    @Override public void onClick(View v) {      try {        MediaRecorder mRecorder = new MediaRecorder();        // 设置声音源为麦克风        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        // 设置输出格式为3gp        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);        // 设置输出文件路径，mFileName为录音音频输出路径        mRecorder.setOutputFile(mFileName);        // 设置声音解码AMR_NB        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        // 媒体录制器准备        mRecorder.prepare();        // 开始录制        mRecorder.start();      } catch (IOException e) {      }    }  }  /**   * 停止录音   */  class stopRecordListener implements OnClickListener {    @Override public void onClick(View v) {      mRecorder.stop();      mRecorder.release();      mRecorder = null;    }  }

2.AudioRecord

AudioRecord录音步骤：1.    创建一个数据流。2.    构造一个AudioRecord对象，其中需要的最小录音缓存buffer大小可以通过getMinBufferSize方法得到。如果buffer容量过小，将导致对象构造的失败。3.    初始化一个buffer，该buffer大于等于AudioRecord对象用于写声音数据的buffer大小。4.    开始录音。5.    从AudioRecord中读取声音数据到初始化buffer，将buffer中数据导入数据流。6.    停止录音。7.    关闭数据流。

录音代码：

  /**   * 录音,需要在新的线程中执行，防止主线程阻塞   */  private void record() {    int frequency = 11025;    int channelConfiguration = AudioFormat.CHANNEL_IN_STEREO;    int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;    try {      // 创建一个数据输入流往文件里写数据      OutputStream os = new FileOutputStream(mFileName);      BufferedOutputStream bos = new BufferedOutputStream(os);      DataOutputStream dos = new DataOutputStream(bos);      // 创建一个AudioRecord对象来录音      int bufferSize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding);      AudioRecord mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency, channelConfiguration,          audioEncoding, bufferSize);      short[] buffer = new short[bufferSize];      // 开始录音      mAudioRecord.startRecording();      isRecording = true;      Log.e(TAG, "record: 录音开始");      while (isRecording) {        int bufferReadResult = mAudioRecord.read(buffer, 0, bufferSize);        for (int i = 0; i < bufferReadResult; i++) {          dos.writeShort(buffer[i]);          Log.e(TAG, "record: 录音中...");        }      }    } catch (Exception e) {      e.printStackTrace();    }  }  /**   * 停止录音   */  class stopRecordListener implements OnClickListener {    @Override public void onClick(View v) {      mAudioRecord.stop();      Log.e(TAG, "record: 录音结束");    }  }

播放代码：

  /**   * 播放录音   */  class startPlayListener implements OnClickListener {    @Override public void onClick(View v) {      try {        // Get the file we want to playback.        File file = new File(mFileName);        // Get the length of the audio stored in the file (16 bit so 2 bytes per short)        // and create a short array to store the recorded audio.        int musicLength = (int) (file.length() / 2);        short[] music = new short[musicLength];        // Create a DataInputStream to read the audio data back from the saved file        InputStream is = new FileInputStream(file);        BufferedInputStream bis = new BufferedInputStream(is);        DataInputStream dis = new DataInputStream(bis);        // Read the file into the music array.        int i = 0;        while (dis.available() > 0) {          music[i++] = dis.readShort();        }        // close the input streams        dis.close();        // Create a new AudioTrack object using the same parameters as the AudioRecord        // object used to create the file.        AudioTrack audioTrack =            new AudioTrack(AudioManager.STREAM_MUSIC, 11025, AudioFormat.CHANNEL_IN_STEREO,                AudioFormat.ENCODING_PCM_16BIT, musicLength * 2, AudioTrack.MODE_STREAM);        Log.e(TAG, "onClick: 开始播放");        // Start playback        audioTrack.play();        // Write the music buffer to the AudioTrack object        audioTrack.write(music, 0, musicLength);        Log.e(TAG, "onClick: 播放结束");        audioTrack.stop();      } catch (Exception e) {        e.printStackTrace();      }    }  }

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