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POErrors when recording sound in Android
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copied!<p>I have made an app that records sound and analyses it for frequency. This process is repeated a couple of times every second and thus uses threading. </p> <p>This does work most of the time, but for some reason in the logcat I get these messages repeated after the first analysis.</p> <p>Rarely (but sometimes) when I test, the app records no sound. So I'm thinking it has something to do with this error.</p> <pre><code>01-23 13:52:03.414: E/AudioRecord(3647): Could not get audio input for record source 1 01-23 13:52:03.424: E/AudioRecord-JNI(3647): Error creating AudioRecord instance: initialization check failed. 01-23 13:52:03.424: E/AudioRecord-Java(3647): [ android.media.AudioRecord ] Error code -20 when initializing native AudioRecord object. </code></pre> <p>The code is below, does anyone have any idea where im going wrong? Am I not killing the AudioRecord object correctly? Code has been modifed for ease of reading:</p> <pre><code>public class recorderThread extends AsyncTask<Sprite, Void, Integer> { short[] audioData; int bufferSize; @Override protected Integer doInBackground(Sprite... ball) { boolean recorded = false; int sampleRate = 8192; AudioRecord recorder = instatiateRecorder(sampleRate); while (!recorded) { //loop until recording is running if (recorder.getState()==android.media.AudioRecord.STATE_INITIALIZED) // check to see if the recorder has initialized yet. { if (recorder.getRecordingState()==android.media.AudioRecord.RECORDSTATE_STOPPED) recorder.startRecording(); //check to see if the Recorder has stopped or is not recording, and make it record. else { //read the PCM audio data into the audioData array //get frequency //checks if correct frequency, assigns number int correctNo = correctNumber(frequency, note); checkIfMultipleNotes(correctNo, max_index, frequency, sampleRate, magnitude, note); if (audioDataIsNotEmpty()) recorded = true; return correctNo; } } else { recorded = false; recorder = instatiateRecorder(sampleRate); } } if (recorder.getState()==android.media.AudioRecord.RECORDSTATE_RECORDING) { killRecorder(recorder); } return 1; } private void killRecorder(AudioRecord recorder) { recorder.stop(); //stop the recorder before ending the thread recorder.release(); //release the recorders resources recorder=null; //set the recorder to be garbage collected } @Override protected void onPostExecute(Integer result) { ballComp.hitCorrectNote = result; } private AudioRecord instatiateRecorder(int sampleRate) { bufferSize= AudioRecord.getMinBufferSize(sampleRate,AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT)*2; //get the buffer size to use with this audio record AudioRecord recorder = new AudioRecord (AudioSource.MIC,sampleRate,AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT,bufferSize); //instantiate the AudioRecorder audioData = new short [bufferSize]; //short array that pcm data is put into. return recorder; } } </code></pre>

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