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POAudioRecord - writing PCM file
 

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  1. POAudioRecord - writing PCM file
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    <p>I' m trying to record some voice using AudioRecord class and then write it to output .pcm file. I want my program to keep recording until the stop button is pressed. Unfortunatelly no matter how long I' m recording, output file size is always 3528 bytes and it lasts for about 20 ms. Also according to Toolsoft Audio Tools, properies of that file are: 44100Hz, 16 bits, stereo, even if I' m using mono with completely different sampling frequency.</p> <pre><code>Thread recordingThread; boolean isRecording = false; int audioSource = AudioSource.MIC; int sampleRateInHz = 44100; int channelConfig = AudioFormat.CHANNEL_IN_MONO; int audioFormat = AudioFormat.ENCODING_PCM_16BIT; int bufferSizeInBytes = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat); byte Data[] = new byte[bufferSizeInBytes]; AudioRecord audioRecorder = new AudioRecord(audioSource, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } public void startRecording(View arg0) { audioRecorder.startRecording(); isRecording = true; recordingThread = new Thread(new Runnable() { public void run() { String filepath = Environment.getExternalStorageDirectory().getPath(); FileOutputStream os = null; try { os = new FileOutputStream(filepath+"/record.pcm"); } catch (FileNotFoundException e) { e.printStackTrace(); } while(isRecording) { audioRecorder.read(Data, 0, Data.length); try { os.write(Data, 0, bufferSizeInBytes); } catch (IOException e) { e.printStackTrace(); } try { os.close(); } catch (IOException e) { e.printStackTrace(); } } } }); recordingThread.start(); } public void stopRecording(View arg0) { if (null != audioRecorder) { isRecording = false; audioRecorder.stop(); audioRecorder.release(); audioRecorder = null; recordingThread = null; } } </code></pre> <p>May I kindly ask you to tell me what's wrong? I'm hoping the answer won't be 'everything' :)</p>
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    1. COI think your IO code might be the problem. Try using Apache Commons IOUtils to copy the streams: http://commons.apache.org/io/api-release/org/apache/commons/io/IOUtils.html#copy(java.io.InputStream,%20java.io.OutputStream)
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      1. USMister Smith
 

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