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add a per-stream ``soft volume'' knob and the corresponding -v option.
The code will be useful later for the volume knob in the sndio API.

/*	$OpenBSD: dev.h,v 1.6 2008/11/10 23:25:37 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);
int  dev_getep(struct abuf **, struct abuf **);
void dev_sync(struct abuf *, struct abuf *);
void dev_attach(char *,
    struct abuf *, struct aparams *, unsigned,
    struct abuf *, struct aparams *, unsigned);
void dev_setvol(struct abuf *, int);
void dev_clear(void);

extern struct devops *devops, devops_sun, devops_aucat;

#endif /* !define(DEV_H) */