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2011-11-02T07:14:59.980
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2015-02-10T09:50:04.190
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<p>Just add this code to your application and you will detect when user start to speak and when he stops.</p> <pre><code>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++; } } </code></pre> <p>Check this <a href="http://vitobrothersoft.com/2011/11/04/voice-detection-for-android/">link</a>.</p>
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1. POVoice Detection in Android Application
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1. USMurtaza Khursheed Hussain
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1. USViktor Apoyan
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1. POVoice Detection in Android Application
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