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make aucat(1) stop automatically the audio(1) device if it's idle. This
way, when in server mode, it consumes no CPU if there are no clients.
Later, this will allow to start aucat(1) at session or system startup.

/*	$OpenBSD: dev.h,v 1.5 2008/11/09 16:26:07 ratchov Exp $	*/
/*
 * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef DEV_H
#define DEV_H

struct aproc;
struct aparams;
struct file;
struct abuf;

extern unsigned dev_bufsz, dev_round, dev_rate;
extern unsigned dev_rate_div, dev_round_div;
extern struct aparams dev_ipar, dev_opar;
extern struct aproc *dev_mix, *dev_sub, *dev_rec, *dev_play;

void dev_roundrate(unsigned *, unsigned *);
void dev_init(char *, struct aparams *, struct aparams *, unsigned, int);
void dev_start(void);
void dev_stop(void);
void dev_run(int);
void dev_done(void);
void dev_sync(struct abuf *, struct abuf *);
void dev_attach(char *,
    struct abuf *, struct aparams *, unsigned,
    struct abuf *, struct aparams *, unsigned);
void dev_clear(void);

extern struct devops *devops, devops_sun, devops_aucat;

#endif /* !define(DEV_H) */