public long getPlaybackBufferTimeUs() {
        return (long)((double)(mPlaybackBufferSize / mFrameSize) / mSampleRate * 1000000d);
    }
Returns the length of the playback buffer, without posidering the current playback position
inside the buffer (the remaining audio data that is waiting for playback can be less than
the buffer length).
@return the length of the playback buffer in microsecs
MediaPlayer/src/main/java/net/protyposis/android/mediaplayer/AudioPlayback.java