I would really appreciate some advice on using AudioTrack. I need to be able to play a number of audio signals on demand, potentially mixed together.
I have no problem setting AudioTrack up and writing an audio buffer to it (originally captured by another Android device's AudioRecord and received via network). However, when I try to put AudioTrack in its own Runnable class, I run into problems. My current implementation instantiates the AudioTrack in the constructor and, to keep things simple, the run() function is a while loop that checks a Buffer queue (modified version of http://www.siafoo.net/snippet/216 to use short instead of byte) and writes anything over 100 bytes to AudioTrack. The buffer queue fills fine, but as soon as I try to write it, the AudioTrack blocks. I am really not sure what relevant code to post, but here is a version of my AudioTrack Runnable code with the irrelevant code missing: public class SoundIn implements Runnable{ BufferQueue m_queue = null; // Audio track to output audio on phone AudioTrack m_audioTrack = null; // Buffer size required to support AudioTrack int m_BufferSize; short[] m_outbuf; public SoundIn(BufferQueue queue) { m_queue = queue; // Get minimum supported buffer size m_BufferSize = AudioTrack.getMinBufferSize(11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); // Initialize a streaming audio track with minimum-size buffer m_audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, m_BufferSize, AudioTrack.MODE_STREAM); m_audioTrack.play(); } public void run() { int minsize; m_outbuf = new short[50000]; while(true) { minsize = //...Get available data size if (minsize == 0) { Log.d("SoundIn", "Sleeping..."); try{Thread.sleep(100);} catch (Exception e){e.printStackTrace();} continue; } //read available bytes from queue m_queue().read(m_outbuf, 0, minsize); //Gets here with m_outbuf correctly holding data m_audioTrack.write(m_outbuf,0,minsize); //Never gets here } } } Any suggestions on why the AudioTrack.write call might block in a situation like this would be greatly appreciated. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
