AudioTrack: docs for getUnderrunCount()

     * An underrun occurs if the application does not write audio

     * data quickly enough, causing the buffer to underflow

     * and a potential audio glitch or pop.

     * <p>

     * Underruns are less likely when buffer sizes are large.

     * <p> Though the "int" type is signed 32-bits, the value should be reinterpreted

     * as if it is unsigned 32-bits.

     * That is, the next position after 0x7FFFFFFF is (int) 0x80000000.

     * This is a continuously advancing counter. It can wrap around to zero

     * if there are too many underruns. If there were, for example, 68 underruns per

     * second then the counter would wrap in 2 years.

     * It may be possible to eliminate underruns by recreating the AudioTrack with

     * a larger buffer.

     * Or by using {@link #setBufferSizeInFrames(int)} to dynamically increase the

     * effective size of the buffer.

     */

    public int getUnderrunCount() {

        return native_get_underrun_count();