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Allow the audio device to be opened only while it's actually used.
This is necessary for uaudio devices, for instance to start aucat
before the device is plugged. Or to unplug a device whithout
having to restart aucat when another device is plugged.  This is
controlled with the new -a option.

Allow multiple audio devices to be used concurently, i.e.
multiple ``-f devname'' options to be used; -f options must follow
per-device options, which is what we do for other options.

/*	$OpenBSD: midi.h,v 1.9 2010/06/04 06:15:28 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 MIDI_H
#define MIDI_H

struct dev;

struct aproc *thru_new(char *);
struct aproc *ctl_new(char *, struct dev *);

int ctl_slotnew(struct aproc *, char *, struct ctl_ops *, void *, int);
void ctl_slotdel(struct aproc *, int);
void ctl_slotvol(struct aproc *, int, unsigned);
int  ctl_slotstart(struct aproc *, int);
void ctl_slotstop(struct aproc *, int);
void ctl_ontick(struct aproc *, int);

void ctl_stop(struct aproc *);
void ctl_start(struct aproc *);
int ctl_idle(struct aproc *);

#endif /* !defined(MIDI_H) */