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POAndroid - How to add my own Audio codec to AudioRecord?
 

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  1. POAndroid - How to add my own Audio codec to AudioRecord?
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    <p>I currently have a Loop back program for testing Audio on Android devices.</p> <p>It uses AudioRecord and AudioTrack to record PCM audio from the Mic and play PCM audio out the earpiece.</p> <p>Here is the code:</p> <pre><code>public class Record extends Thread { static final int bufferSize = 200000; final short[] buffer = new short[bufferSize]; short[] readBuffer = new short[bufferSize]; public void run() { isRecording = true; android.os.Process.setThreadPriority (android.os.Process.THREAD_PRIORITY_URGENT_AUDIO); int buffersize = AudioRecord.getMinBufferSize(11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize); atrack = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize, AudioTrack.MODE_STREAM); atrack.setPlaybackRate(11025); byte[] buffer = new byte[buffersize]; arec.startRecording(); atrack.play(); while(isRecording) { arec.read(buffer, 0, buffersize); atrack.write(buffer, 0, buffer.length); } } } </code></pre> <p>So as you can see in the creation of the AudioTrack and AudioRecord the Encoding is supplied via the AudioFormat but this only allows 16 bit or 8 bit PCM.</p> <p>I have my own G711 Codec implementation now and I want to be able to encode the audio from the Mic and decode it going into the EarPiece, So I have <strong>encode(short lin[], int offset, byte enc[], int frames)</strong> and <strong>decode(byte enc[], short lin[], int frames)</strong> methods but I'm unsure as to how to use them to encode and the decode the audio from the AudioRecord and AudioTrack.</p> <p>Can anyone help me or point me in the right direction?</p>
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