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add a new -w flag to control whether master volume is automatically
adjusted when new streams are connected and disconnected. Disabling
automatic volume adjustment makes sense if all streams are recorded
with properly lowered volumes.

/*	$OpenBSD: dev.h,v 1.28 2011/05/26 07:18:40 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

#include "aparams.h"

struct aproc;
struct abuf;

struct dev {
	struct dev *next;

	/*
	 * desired parameters
	 */
	unsigned reqmode;			/* mode */
	struct aparams reqipar, reqopar;	/* parameters */
	unsigned reqbufsz;			/* buffer size */
	unsigned reqround;			/* block size */
	unsigned reqrate;			/* sample rate */
	unsigned hold;				/* hold the device open ? */
	unsigned autovol;			/* auto adjust playvol ? */
	unsigned refcnt;			/* number of openers */
#define DEV_CLOSED	0			/* closed */
#define DEV_INIT	1			/* stopped */
#define DEV_START	2			/* ready to start */
#define DEV_RUN		3			/* started */
	unsigned pstate;			/* on of DEV_xxx */
	char *path;				/* sio path */

	/*
	 * actual parameters and runtime state (i.e. once opened)
	 */
	unsigned mode;				/* bitmap of MODE_xxx */
	unsigned bufsz, round, rate;
	struct aparams ipar, opar;
	struct aproc *mix, *sub, *submon;
	struct aproc *rec, *play, *mon;
	struct aproc *midi;
};

extern struct dev *dev_list;

int  dev_run(struct dev *);
int  dev_ref(struct dev *);
void dev_unref(struct dev *);
void dev_del(struct dev *);
void dev_wakeup(struct dev *);
void dev_drain(struct dev *);
struct dev *dev_new_thru(void);
struct dev *dev_new_loop(struct aparams *, struct aparams *, unsigned);
struct dev *dev_new_sio(char *, unsigned, 
    struct aparams *, struct aparams *,
    unsigned, unsigned, unsigned, unsigned);
int  dev_thruadd(struct dev *, char *, int, int);
void dev_midiattach(struct dev *, struct abuf *, struct abuf *);
unsigned dev_roundof(struct dev *, unsigned);
int dev_getpos(struct dev *);
void dev_attach(struct dev *, char *, unsigned,
    struct abuf *, struct aparams *, unsigned,
    struct abuf *, struct aparams *, unsigned,
    unsigned, int);
void dev_setvol(struct dev *, struct abuf *, int);

#endif /* !define(DEV_H) */