Automated import from //branches/master/...@142066,142066

        readSize = audioBuffer.size;

        // Sanity check on returned size

        if (ssize_t(readSize) <= 0) break;

        if (ssize_t(readSize) <= 0) {

            // The callback is done filling buffers

            // Keep this thread going to handle timed events and

            // still try to get more data in intervals of WAIT_PERIOD_MS

            // but don't just loop and block the CPU, so wait

            usleep(WAIT_PERIOD_MS*1000);

            break;

        }

        if (readSize > reqSize) readSize = reqSize;

        audioBuffer.size = readSize;