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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: wav.h,v 1.10 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 WAV_H
#define WAV_H

#include <sys/types.h>

#include "aparams.h"
#include "pipe.h"

struct wav {
	struct pipe pipe;
#define HDR_AUTO	0	/* guess by looking at the file name */
#define HDR_RAW		1	/* no headers, ie openbsd native ;-) */
#define HDR_WAV		2	/* microsoft riff wave */
	unsigned hdr;		/* HDR_RAW or HDR_WAV */
	unsigned xrun;		/* xrun policy */
	struct aparams hpar;	/* parameters to write on the header */
	off_t rbytes;		/* bytes to read, -1 if no limit */
	off_t wbytes;		/* bytes to write, -1 if no limit */
	off_t startpos;		/* beginning of the data chunk */
	off_t endpos;		/* end of the data chunk */
	off_t mmcpos;		/* play/rec start point set by MMC */
	short *map;		/* mulaw/alaw -> s16 conversion table */
	int slot;		/* mixer ctl slot number */
	int mmc;		/* use MMC control */
	int join;		/* join/expand channels */
	unsigned vol;		/* current volume */
	unsigned maxweight;	/* dynamic range when vol == 127 */
#define WAV_INIT	0	/* not trying to do anything */
#define WAV_START	1	/* buffer allocated */
#define WAV_READY	2	/* buffer filled enough */
#define WAV_RUN		3	/* buffer attached to device */
#define WAV_FAILED	4	/* failed to seek */
	unsigned pstate;	/* one of above */
	unsigned mode;		/* bitmap of MODE_* */
	struct dev *dev;	/* device playing or recording */
};

extern struct fileops wav_ops;

struct wav *wav_new_in(struct fileops *, struct dev *,
    unsigned, char *, unsigned, struct aparams *, unsigned, unsigned, int, int);
struct wav *wav_new_out(struct fileops *, struct dev *,
    unsigned, char *, unsigned, struct aparams *, unsigned, int, int);
unsigned wav_read(struct file *, unsigned char *, unsigned);
unsigned wav_write(struct file *, unsigned char *, unsigned);
void wav_close(struct file *);
int wav_readhdr(int, struct aparams *, off_t *, off_t *, short **);
int wav_writehdr(int, struct aparams *, off_t *, off_t);
void wav_conv(unsigned char *, unsigned, short *);

/* legacy */
int legacy_play(char *, char *);

extern short wav_ulawmap[256];
extern short wav_alawmap[256];

#endif /* !defined(WAV_H) */