Question

我正在开发用于检测用户说话的应用程序，这意味着如果用户开始讲话应用程序开始录制来自麦克风的声音，然后当用户停止讲话时，应用程序停止录制并保存录制的音频。

以下代码应该这样做，但我的问题是这段代码从PCM转换为.WAV，我不希望...我应该对代码进行哪些更改以便将其保留在PCM中？

我的另一个问题是这段代码一直给我以下错误：

RECORDER_BPP无法解析为变量

所以我的问题是：

1-如何解决此错误：RECORDER_BPP无法解析为a 变量

2-如何编辑此代码以保持PCM。

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

// Get the minimum buffer size required for the successful creation of an AudioRecord object. 
int bufferSizeInBytes = AudioRecord.getMinBufferSize( RECORDER_SAMPLERATE,
                                                      RECORDER_CHANNELS,
                                                      RECORDER_AUDIO_ENCODING
                                                     ); 
// Initialize Audio Recorder.
AudioRecord audioRecorder = new AudioRecord( MediaRecorder.AudioSource.MIC,
                                             RECORDER_SAMPLERATE,
                                             RECORDER_CHANNELS,
                                             RECORDER_AUDIO_ENCODING,
                                             bufferSizeInBytes
                                            );
// Start Recording.
audioRecorder.startRecording();

int numberOfReadBytes   = 0; 
byte audioBuffer[]      = new  byte[bufferSizeInBytes];
boolean recording       = false;
float tempFloatBuffer[] = new float[3];
int tempIndex           = 0;
int totalReadBytes      = 0;
byte totalByteBuffer[]  = new byte[60 * 44100 * 2];


// While data come from microphone. 
while( true )
{
    float totalAbsValue = 0.0f;
    short sample        = 0; 

    numberOfReadBytes = audioRecorder.read( audioBuffer, 0, bufferSizeInBytes );

    // Analyze Sound.
    for( int i=0; i<bufferSizeInBytes; i+=2 ) 
    {
        sample = (short)( (audioBuffer[i]) | audioBuffer[i + 1] << 8 );
        totalAbsValue += Math.abs( sample ) / (numberOfReadBytes/2);
    }

    // Analyze temp buffer.
    tempFloatBuffer[tempIndex%3] = totalAbsValue;
    float temp                   = 0.0f;
    for( int i=0; i<3; ++i )
        temp += tempFloatBuffer[i];

    if( (temp >=0 && temp <= 350) && recording == false )
    {
        Log.i("TAG", "1");
        tempIndex++;
        continue;
    }

    if( temp > 350 && recording == false )
    {
        Log.i("TAG", "2");
        recording = true;
    }

    if( (temp >= 0 && temp <= 350) && recording == true )
    {
        Log.i("TAG", "Save audio to file.");

        // Save audio to file.
        String filepath = Environment.getExternalStorageDirectory().getPath();
        File file = new File(filepath,"AudioRecorder");
        if( !file.exists() )
            file.mkdirs();

        String fn = file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".wav";

        long totalAudioLen  = 0;
        long totalDataLen   = totalAudioLen + 36;
        long longSampleRate = RECORDER_SAMPLERATE;
        int channels        = 1;
        long byteRate       = RECORDER_BPP * RECORDER_SAMPLERATE * channels/8;
        totalAudioLen       = totalReadBytes;
        totalDataLen        = totalAudioLen + 36;
        byte finalBuffer[]  = new byte[totalReadBytes + 44];

        finalBuffer[0] = 'R';  // RIFF/WAVE header
        finalBuffer[1] = 'I';
        finalBuffer[2] = 'F';
        finalBuffer[3] = 'F';
        finalBuffer[4] = (byte) (totalDataLen & 0xff);
        finalBuffer[5] = (byte) ((totalDataLen >> 8) & 0xff);
        finalBuffer[6] = (byte) ((totalDataLen >> 16) & 0xff);
        finalBuffer[7] = (byte) ((totalDataLen >> 24) & 0xff);
        finalBuffer[8] = 'W';
        finalBuffer[9] = 'A';
        finalBuffer[10] = 'V';
        finalBuffer[11] = 'E';
        finalBuffer[12] = 'f';  // 'fmt ' chunk
        finalBuffer[13] = 'm';
        finalBuffer[14] = 't';
        finalBuffer[15] = ' ';
        finalBuffer[16] = 16;  // 4 bytes: size of 'fmt ' chunk
        finalBuffer[17] = 0;
        finalBuffer[18] = 0;
        finalBuffer[19] = 0;
        finalBuffer[20] = 1;  // format = 1
        finalBuffer[21] = 0;
        finalBuffer[22] = (byte) channels;
        finalBuffer[23] = 0;
        finalBuffer[24] = (byte) (longSampleRate & 0xff);
        finalBuffer[25] = (byte) ((longSampleRate >> 8) & 0xff);
        finalBuffer[26] = (byte) ((longSampleRate >> 16) & 0xff);
        finalBuffer[27] = (byte) ((longSampleRate >> 24) & 0xff);
        finalBuffer[28] = (byte) (byteRate & 0xff);
        finalBuffer[29] = (byte) ((byteRate >> 8) & 0xff);
        finalBuffer[30] = (byte) ((byteRate >> 16) & 0xff);
        finalBuffer[31] = (byte) ((byteRate >> 24) & 0xff);
        finalBuffer[32] = (byte) (2 * 16 / 8);  // block align
        finalBuffer[33] = 0;
        finalBuffer[34] = RECORDER_BPP;  // bits per sample
        finalBuffer[35] = 0;
        finalBuffer[36] = 'd';
        finalBuffer[37] = 'a';
        finalBuffer[38] = 't';
        finalBuffer[39] = 'a';
        finalBuffer[40] = (byte) (totalAudioLen & 0xff);
        finalBuffer[41] = (byte) ((totalAudioLen >> 8) & 0xff);
        finalBuffer[42] = (byte) ((totalAudioLen >> 16) & 0xff);
        finalBuffer[43] = (byte) ((totalAudioLen >> 24) & 0xff);

        for( int i=0; i<totalReadBytes; ++i )
            finalBuffer[44+i] = totalByteBuffer[i];

        FileOutputStream out;
        try {
            out = new FileOutputStream(fn);
             try {
                    out.write(finalBuffer);
                    out.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

        //*/
        tempIndex++;
        break;
    }

    // -> Recording sound here.
    Log.i( "TAG", "Recording Sound." );
    for( int i=0; i<numberOfReadBytes; i++ )
        totalByteBuffer[totalReadBytes + i] = audioBuffer[i];
    totalReadBytes += numberOfReadBytes;
    //*/

    tempIndex++;

   }
   }

以下是我获得CODE的地方：Voice Detection in Android Application

Answer 1

问题变得非常简单，你必须将这个语句添加到你的代码中，并且一切顺利。

private static final int RECORDER_BPP = 16;

如何使用Android应用程序检测PCM文件中的用户语音

1 个答案: