audio_buf_wgetblk
ptr = audio_buf_wgetblk(&sc->play, &count);
ptr = audio_buf_wgetblk(&sc->play, &count);
ptr = audio_buf_wgetblk(&sc->rec, &count);
ptr = audio_buf_wgetblk(&sc->rec, &count);
ptr = audio_buf_wgetblk(&sc->rec, &count);