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move all device related stuff from aucat.c to a new dev.c file.
The new dev_xxx() routines expose a "high level" self-contained
interface to the device. At initialization, the device is opened
and two chains of aproc structures are created:

 * a playback chain that exposes a (initially) empty mix
   aproc to which the rest of the code can attach new
   streams to be played

 * record chain that exposes a (initially) empty sub aproc
   to which the rest of the code can attach new stream to
   to record

The rest of the code, has just to use dev_attach() routine to
attach streams. While we're at it, add a ``devops'' structure
containing pointers to the device-specific routines. This will
allow later to add support for other type of device than the
Sun API.

Also, write the .wav headers in file_del(), so put all header
related data in the file strucuture. This allows to close() the
file, as soon as wpipe_xxx() aproc terminates. This will be
useful for the server, because it will need to close() descripts
of closed connections immediately.

add mix_pushzero() routine to fill the mixer with silence. It
will be used to avoid the mixer to underrun when there are no
input streams. Since we always have at least one input stream
there's no behaviour change.

ok jakemsr

/*	$OpenBSD: dev.h,v 1.2 2008/08/14 09:58:55 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_infr, dev_onfr;
extern struct aparams dev_ipar, dev_opar;
extern struct aproc *dev_mix, *dev_sub, *dev_rec, *dev_play;
extern struct file  *dev_file;

void dev_fill(void);
void dev_flush(void);
void dev_init(char *, struct aparams *, struct aparams *);
void dev_start(void);
void dev_stop(void);
void dev_run(int);
void dev_done(void);
void dev_attach(char *,
    struct abuf *, struct aparams *, unsigned,
    struct abuf *, struct aparams *, unsigned);

struct devops {
	int (*open)(char *, struct aparams *, struct aparams *,
	    unsigned *, unsigned *);
	void (*close)(int);
	void (*start)(int);
	void (*stop)(int);
};

extern struct devops *devops, devops_sun;

/*
 * Sun API specific functions
 */
struct audio_prinfo;
int sun_infotopar(struct audio_prinfo *, struct aparams *);
void sun_partoinfo(struct audio_prinfo *, struct aparams *);

#endif /* !define(DEV_H) */