AudioRecord缓冲区值

Question

嗨我正在构建一个应用程序，它将使用来自MIC的传入音频并将其与存储的声音文件进行比较。此刻，我正试图掌握AudioRecord函数的数据在保存到字节数组时的外观。我的问题是，返回的值都是零。我不知道我是否可能没有正确使用/设置AudioRecord功能。这里是我的代码：

import android.app.Activity; 
import android.media.AudioRecord; 
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; 
import android.widget.TextView; 

public class SnoreAlarmActivity extends Activity implements OnClickListener { 
/** Called when the activity is first created. */ 

Button start, stop; 
TextView display; 
Boolean rec = false; 
AudioRecord snore; 
byte[] arrayOfByte = new byte[16 * 1024/8]; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    start = (Button) findViewById(R.id.bStart); 
    stop = (Button) findViewById(R.id.bStop); 
    display = (TextView) findViewById(R.id.tAnswer); 

    start.setOnClickListener(this); 
    stop.setOnClickListener(this); 

    int i = AudioRecord.getMinBufferSize(44100, 16, 2); 
    snore = new AudioRecord(MediaRecorder.AudioSource.MIC, 44100, 16, 2, i);// From 
                      // MIC,Sample 
                      // Rate 
                      // of 
                      // 44100, 
                      // Channel_IN_MONO,16Bit 
                      // Encoding,buffer 
                      // size 
                      // i 
    new Record().start(); 
} 

@Override 
public void onClick(View arg0) { 
    // TODO Auto-generated method stub 
    switch (arg0.getId()) { 

    case R.id.bStart: 
     rec = true; 
     break; 

    case R.id.bStop: 
     rec = false; 
     snore.stop(); 
     snore.release(); 

     for (int i = 0; i < 100; i++) { 
      int x = (int) arrayOfByte[i]; 
      Log.w("Tag", "" + x); 

     } 
     break; 
    } 
} 

class Record extends Thread { 
    Record() { 

    } 

    @Override 
    public void run() { 
     // TODO Auto-generated method stub 
     while (rec) { 
      snore.startRecording(); 
      snore.read(arrayOfByte, 0, (16 * 1024/8)); 
     } 
    } 

    } 
} 

所以我的问题是，为什么我得到零？ *另外我知道我应该将数据存储在一个简短的16Bit编码中，稍后会做，只是试图理解此时从AudioRecord函数返回的值。

Answer 1

你在模拟器上吗？我听说麦克风不适用于此。

Answer 2

通过MIC录音给我头痛:)

希望这将帮助，因为我失去了一整天摆弄它。 这里有步骤，而且必须满足的MIC工作

1. Maniefst.xml必须包含：

   <使用许可权的android：NAME = “android.permission.RECORD_AUDIO”/>

2. AudioRecord缓冲区应该设置AudioRecord.getMinBufferSize（你做对了）

3. 如果MIC没有发布，你将无法再绑定到MIC！ 重新启动手机将重置MIC。

下面是我如何做到的简短例子。

private android.media.AudioRecord aRecorder = null; 
private Boolean breakLoop = false; 
private byte[] buffer; 
public Boolean StartRecording() 
    int freq = 22050; 
    try 
    { 
     prepareWaveFile(MyRandomAccessFile); //open file and writes WAV header 
     int bufferSize = android.media.AudioRecord.getMinBufferSize(freq, android.media.AudioFormat.CHANNEL_IN_MONO, android.media.AudioFormat.ENCODING_PCM_16BIT); 
     buffer = new byte[bufferSize]; 
     if(bufferSize == AudioRecord.ERROR_BAD_VALUE){ 
       Log.e(LOG_TAG, "Min buff size error"); 
       return false; 
     } 

     aRecorder = new android.media.AudioRecord(MediaRecorder.AudioSource.MIC, freq, android.media.AudioFormat.CHANNEL_IN_MONO, android.media.AudioFormat.ENCODING_PCM_16BIT, bufferSize); 

     aRecorder.startRecording(); 
     breakLoop = false; 
     int TotalSize=0; //koliko je snimljeno podataka 
     while (TotalSize < freq * 2 * 1 * 30) { //SampleRate * BytesPerSample * NumberOfChannels * seconds 
      int bufferReadResult = aRecorder.read(buffer, 0, bufferSize); 
      TotalSize+=bufferReadResult; // filesize failsafe 
      if (breakLoop) break; //if other thread stops recording 
      if (bufferReadResult>0) MyRandomAccessFile.write(buffer, 0, bufferReadResult); //write into some file ... 
     } 

     aRecorder.stop(); 
     aRecorder.release(); //this is mandatory ! 
     updateWaveFile(MyRandomAccessFile); //updates wave header 
     MyRandomAccessFile.close(); 
     return true; 
    } catch (Exception e) 
    { 
     Log.e(LOG_TAG, "StartRecording: LOOP " + e); 

     try 
     { 
      aRecorder.stop(); 
     } catch(Exception ex) {} 

     try 
     { 
      aRecorder.release(); 
     } catch(Exception ex) {} 

     try 
     { 
      randomAccessWriter.close(); 
     } catch(Exception ex) {} 
     return false; 
    }