AudioTrack non-blocking write

     *      WOULD_BLOCK         when obtainBuffer() returns same, or

     *                          AudioTrack was stopped during the write

     *      or any other error code returned by IAudioTrack::start() or restoreTrack_l().

     * Default behavior is to only return until all data has been transferred. Set 'blocking' to

     * false for the method to return immediately without waiting to try multiple times to write

     * the full content of the buffer.

     */

            ssize_t     write(const void* buffer, size_t size);

            ssize_t     write(const void* buffer, size_t size, bool blocking = true);

    /*

     * Dumps the state of an audio track.

// -------------------------------------------------------------------------

ssize_t AudioTrack::write(const void* buffer, size_t userSize)

ssize_t AudioTrack::write(const void* buffer, size_t userSize, bool blocking)

{

    if (mTransfer != TRANSFER_SYNC || mIsTimed) {

        return INVALID_OPERATION;

    while (userSize >= mFrameSize) {

        audioBuffer.frameCount = userSize / mFrameSize;

        status_t err = obtainBuffer(&audioBuffer, &ClientProxy::kForever);

        status_t err = obtainBuffer(&audioBuffer,

                blocking ? &ClientProxy::kForever : &ClientProxy::kNonBlocking);

        if (err < 0) {

            if (written > 0) {

                break;