NetBSD/sys/dev/audio.c

/*	$NetBSD: audio.c,v 1.183 2004/07/07 22:30:22 mycroft Exp $	*/

/*
 * Copyright (c) 1991-1993 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * This is a (partially) SunOS-compatible /dev/audio driver for NetBSD.
 *
 * This code tries to do something half-way sensible with
 * half-duplex hardware, such as with the SoundBlaster hardware.  With
 * half-duplex hardware allowing O_RDWR access doesn't really make
 * sense.  However, closing and opening the device to "turn around the
 * line" is relatively expensive and costs a card reset (which can
 * take some time, at least for the SoundBlaster hardware).  Instead
 * we allow O_RDWR access, and provide an ioctl to set the "mode",
 * i.e. playing or recording.
 *
 * If you write to a half-duplex device in record mode, the data is
 * tossed.  If you read from the device in play mode, you get silence
 * filled buffers at the rate at which samples are naturally
 * generated.
 *
 * If you try to set both play and record mode on a half-duplex
 * device, playing takes precedence.
 */

/*
 * Todo:
 * - Add softaudio() isr processing for wakeup, poll, signals,
 *   and silence fill.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.183 2004/07/07 22:30:22 mycroft Exp $");

#include "audio.h"
#if NAUDIO > 0

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/vnode.h>
#include <sys/select.h>
#include <sys/poll.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/kernel.h>
#include <sys/signalvar.h>
#include <sys/conf.h>
#include <sys/audioio.h>
#include <sys/device.h>

#include <dev/audio_if.h>
#include <dev/audiovar.h>

#include <machine/endian.h>

#ifdef AUDIO_DEBUG
#define DPRINTF(x)	if (audiodebug) printf x
#define DPRINTFN(n,x)	if (audiodebug>(n)) printf x
int	audiodebug = AUDIO_DEBUG;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

#define ROUNDSIZE(x) x &= -16	/* round to nice boundary */

int	audio_blk_ms = AUDIO_BLK_MS;

int	audiosetinfo(struct audio_softc *, struct audio_info *);
int	audiogetinfo(struct audio_softc *, struct audio_info *);

int	audio_open(dev_t, struct audio_softc *, int, int, struct proc *);
int	audio_close(struct audio_softc *, int, int, struct proc *);
int	audio_read(struct audio_softc *, struct uio *, int);
int	audio_write(struct audio_softc *, struct uio *, int);
int	audio_ioctl(struct audio_softc *, u_long, caddr_t, int, struct proc *);
int	audio_poll(struct audio_softc *, int, struct proc *);
int	audio_kqfilter(struct audio_softc *, struct knote *);
paddr_t	audio_mmap(struct audio_softc *, off_t, int);

int	mixer_open(dev_t, struct audio_softc *, int, int, struct proc *);
int	mixer_close(struct audio_softc *, int, int, struct proc *);
int	mixer_ioctl(struct audio_softc *, u_long, caddr_t, int, struct proc *);
static	void mixer_remove(struct audio_softc *, struct proc *p);
static	void mixer_signal(struct audio_softc *);

void	audio_init_record(struct audio_softc *);
void	audio_init_play(struct audio_softc *);
int	audiostartr(struct audio_softc *);
int	audiostartp(struct audio_softc *);
void	audio_rint(void *);
void	audio_pint(void *);
int	audio_check_params(struct audio_params *);

void	audio_calc_blksize(struct audio_softc *, int);
void	audio_fill_silence(struct audio_params *, u_char *, int);
int	audio_silence_copyout(struct audio_softc *, int, struct uio *);

void	audio_init_ringbuffer(struct audio_softc *, struct audio_ringbuffer *);
int	audio_initbufs(struct audio_softc *);
void	audio_calcwater(struct audio_softc *);
static __inline int audio_sleep_timo(int *, char *, int);
static __inline int audio_sleep(int *, char *);
static __inline void audio_wakeup(int *);
int	audio_drain(struct audio_softc *);
void	audio_clear(struct audio_softc *);
static __inline void audio_pint_silence
	(struct audio_softc *, struct audio_ringbuffer *, u_char *, int);

int	audio_alloc_ring
	(struct audio_softc *, struct audio_ringbuffer *, int, size_t);
void	audio_free_ring(struct audio_softc *, struct audio_ringbuffer *);
int	audio_set_defaults(struct audio_softc *, u_int);

int	audioprobe(struct device *, struct cfdata *, void *);
void	audioattach(struct device *, struct device *, void *);
int	audiodetach(struct device *, int);
int	audioactivate(struct device *, enum devact);

struct portname {
	const char	*name;
	int	mask;
};
static const struct portname itable[] = {
	{ AudioNmicrophone,	AUDIO_MICROPHONE },
	{ AudioNline,		AUDIO_LINE_IN },
	{ AudioNcd,		AUDIO_CD },
	{ 0 }
};
static const struct portname otable[] = {
	{ AudioNspeaker,	AUDIO_SPEAKER },
	{ AudioNheadphone,	AUDIO_HEADPHONE },
	{ AudioNline,		AUDIO_LINE_OUT },
	{ 0 }
};
void	au_setup_ports(struct audio_softc *, struct au_mixer_ports *,
			mixer_devinfo_t *, const struct portname *);
int	au_set_gain(struct audio_softc *, struct au_mixer_ports *,
			 int, int);
void	au_get_gain(struct audio_softc *, struct au_mixer_ports *,
			 u_int *, u_char *);
int	au_set_port(struct audio_softc *, struct au_mixer_ports *,
			 u_int);
int	au_get_port(struct audio_softc *, struct au_mixer_ports *);
int	au_get_lr_value(struct audio_softc *, mixer_ctrl_t *,
			     int *, int *r);
int	au_set_lr_value(struct audio_softc *, mixer_ctrl_t *,
			     int, int);
int	au_portof(struct audio_softc *, char *, int);

dev_type_open(audioopen);
dev_type_close(audioclose);
dev_type_read(audioread);
dev_type_write(audiowrite);
dev_type_ioctl(audioioctl);
dev_type_poll(audiopoll);
dev_type_mmap(audiommap);
dev_type_kqfilter(audiokqfilter);

const struct cdevsw audio_cdevsw = {
	audioopen, audioclose, audioread, audiowrite, audioioctl,
	nostop, notty, audiopoll, audiommap, audiokqfilter,
};

/* The default audio mode: 8 kHz mono mu-law */
const struct audio_params audio_default = {
	.sample_rate = 8000,
	.encoding = AUDIO_ENCODING_ULAW,
	.precision = 8,
	.channels = 1,
	.sw_code = 0,
	.factor = 1,
	.factor_denom = 1
};

CFATTACH_DECL(audio, sizeof(struct audio_softc),
    audioprobe, audioattach, audiodetach, audioactivate);

extern struct cfdriver audio_cd;

int
audioprobe(struct device *parent, struct cfdata *match, void *aux)
{
	struct audio_attach_args *sa = aux;

	DPRINTF(("audioprobe: type=%d sa=%p hw=%p\n",
		 sa->type, sa, sa->hwif));
	return (sa->type == AUDIODEV_TYPE_AUDIO) ? 1 : 0;
}

void
audioattach(struct device *parent, struct device *self, void *aux)
{
	struct audio_softc *sc = (void *)self;
	struct audio_attach_args *sa = aux;
	struct audio_hw_if *hwp = sa->hwif;
	void *hdlp = sa->hdl;
	int error;
	mixer_devinfo_t mi;
	int iclass, mclass, oclass, props;

#ifdef DIAGNOSTIC
	if (hwp == 0 ||
	    hwp->open == 0 ||
	    hwp->close == 0 ||
	    hwp->query_encoding == 0 ||
	    hwp->set_params == 0 ||
	    (hwp->start_output == 0 && hwp->trigger_output == 0) ||
	    (hwp->start_input == 0 && hwp->trigger_input == 0) ||
	    hwp->halt_output == 0 ||
	    hwp->halt_input == 0 ||
	    hwp->getdev == 0 ||
	    hwp->set_port == 0 ||
	    hwp->get_port == 0 ||
	    hwp->query_devinfo == 0 ||
	    hwp->get_props == 0) {
		printf(": missing method\n");
		sc->hw_if = 0;
		return;
	}
#endif

	props = hwp->get_props(hdlp);

	if (props & AUDIO_PROP_FULLDUPLEX)
		printf(": full duplex");
	else
		printf(": half duplex");

	if (props & AUDIO_PROP_MMAP)
		printf(", mmap");
	if (props & AUDIO_PROP_INDEPENDENT)
		printf(", independent");

	printf("\n");

	sc->hw_if = hwp;
	sc->hw_hdl = hdlp;
	sc->sc_dev = parent;

	error = audio_alloc_ring(sc, &sc->sc_pr, AUMODE_PLAY, AU_RING_SIZE);
	if (error) {
		sc->hw_if = 0;
		printf("audio: could not allocate play buffer\n");
		return;
	}
	error = audio_alloc_ring(sc, &sc->sc_rr, AUMODE_RECORD, AU_RING_SIZE);
	if (error) {
		audio_free_ring(sc, &sc->sc_pr);
		sc->hw_if = 0;
		printf("audio: could not allocate record buffer\n");
		return;
	}

	sc->sc_pconvbuffer = malloc(AU_RING_SIZE, M_DEVBUF, M_WAITOK);
	sc->sc_pconvbuffer_size = AU_RING_SIZE;
	sc->sc_rconvbuffer = malloc(AU_RING_SIZE, M_DEVBUF, M_WAITOK);
	sc->sc_rconvbuffer_size = AU_RING_SIZE;

	if (audio_set_defaults(sc, 0))
		panic("audioattach: audio_set_defaults failed");

	sc->sc_input_fragment_length = 0;

	iclass = mclass = oclass = -1;
	sc->sc_inports.index = -1;
	sc->sc_inports.master = -1;
	sc->sc_inports.nports = 0;
	sc->sc_inports.isenum = 0;
	sc->sc_inports.allports = 0;
	sc->sc_inports.isdual = 0;
	sc->sc_inports.mixerout = -1;
	sc->sc_inports.cur_port = -1;
	sc->sc_outports.index = -1;
	sc->sc_outports.master = -1;
	sc->sc_outports.nports = 0;
	sc->sc_outports.isenum = 0;
	sc->sc_outports.allports = 0;
	sc->sc_outports.isdual = 0;
	sc->sc_outports.mixerout = -1;
	sc->sc_outports.cur_port = -1;
	sc->sc_monitor_port = -1;
	for(mi.index = 0; ; mi.index++) {
		if (hwp->query_devinfo(hdlp, &mi) != 0)
			break;
		if (mi.type == AUDIO_MIXER_CLASS) {
			if (strcmp(mi.label.name, AudioCrecord) == 0)
				iclass = mi.mixer_class;
			if (strcmp(mi.label.name, AudioCmonitor) == 0)
				mclass = mi.mixer_class;
			if (strcmp(mi.label.name, AudioCoutputs) == 0)
				oclass = mi.mixer_class;
		}
	}
	for(mi.index = 0; ; mi.index++) {
		if (hwp->query_devinfo(hdlp, &mi) != 0)
			break;
		if (mi.type == AUDIO_MIXER_CLASS)
			continue;
		if (mi.mixer_class == iclass) {
			if (strcmp(mi.label.name, AudioNmaster) == 0)
				sc->sc_inports.master = mi.index;
#if 1	/* Deprecated. Use AudioNmaster. */
			if (strcmp(mi.label.name, AudioNrecord) == 0)
				sc->sc_inports.master = mi.index;
			if (strcmp(mi.label.name, AudioNvolume) == 0)
				sc->sc_inports.master = mi.index;
#endif
			if (strcmp(mi.label.name, AudioNsource) == 0) {
				if (mi.type == AUDIO_MIXER_ENUM) {
				    int i;
				    for(i = 0; i < mi.un.e.num_mem; i++)
					if (strcmp(mi.un.e.member[i].label.name,
						    AudioNmixerout) == 0)
						sc->sc_inports.mixerout =
						    mi.un.e.member[i].ord;
				}
				au_setup_ports(sc, &sc->sc_inports, &mi,
				    itable);
			}
		} else if (mi.mixer_class == mclass) {
			if (strcmp(mi.label.name, AudioNmonitor) == 0)
				sc->sc_monitor_port = mi.index;
		} else if (mi.mixer_class == oclass) {
			if (strcmp(mi.label.name, AudioNmaster) == 0)
				sc->sc_outports.master = mi.index;
			if (strcmp(mi.label.name, AudioNselect) == 0)
				au_setup_ports(sc, &sc->sc_outports, &mi,
				    otable);
		}
	}
	DPRINTF(("audio_attach: inputs ports=0x%x, input master=%d, "
		 "output ports=0x%x, output master=%d\n",
		 sc->sc_inports.allports, sc->sc_inports.master,
		 sc->sc_outports.allports, sc->sc_outports.master));
}

int
audioactivate(struct device *self, enum devact act)
{
	struct audio_softc *sc = (struct audio_softc *)self;

	switch (act) {
	case DVACT_ACTIVATE:
		return (EOPNOTSUPP);

	case DVACT_DEACTIVATE:
		sc->sc_dying = 1;
		break;
	}
	return (0);
}

int
audiodetach(struct device *self, int flags)
{
	struct audio_softc *sc = (struct audio_softc *)self;
	int maj, mn;
	int s;

	DPRINTF(("audio_detach: sc=%p flags=%d\n", sc, flags));

	sc->sc_dying = 1;

	wakeup(&sc->sc_wchan);
	wakeup(&sc->sc_rchan);
	s = splaudio();
	if (--sc->sc_refcnt >= 0) {
		if (tsleep(&sc->sc_refcnt, PZERO, "auddet", hz * 120))
			printf("audiodetach: %s didn't detach\n",
			       sc->dev.dv_xname);
	}
	splx(s);

	/* free resources */
	audio_free_ring(sc, &sc->sc_pr);
	audio_free_ring(sc, &sc->sc_rr);
	free(sc->sc_pconvbuffer, M_DEVBUF);
	free(sc->sc_rconvbuffer, M_DEVBUF);

	/* locate the major number */
	maj = cdevsw_lookup_major(&audio_cdevsw);

	/* Nuke the vnodes for any open instances (calls close). */
	mn = self->dv_unit;
	vdevgone(maj, mn | SOUND_DEVICE,    mn | SOUND_DEVICE, VCHR);
	vdevgone(maj, mn | AUDIO_DEVICE,    mn | AUDIO_DEVICE, VCHR);
	vdevgone(maj, mn | AUDIOCTL_DEVICE, mn | AUDIOCTL_DEVICE, VCHR);
	vdevgone(maj, mn | MIXER_DEVICE,    mn | MIXER_DEVICE, VCHR);

	return (0);
}

int
au_portof(struct audio_softc *sc, char *name, int class)
{
	mixer_devinfo_t mi;

	for(mi.index = 0;
	    sc->hw_if->query_devinfo(sc->hw_hdl, &mi) == 0;
	    mi.index++)
		if (mi.mixer_class == class && strcmp(mi.label.name, name) == 0)
			return mi.index;
	return -1;
}

void
au_setup_ports(struct audio_softc *sc, struct au_mixer_ports *ports,
	       mixer_devinfo_t *mi, const struct portname *tbl)
{
	int i, j;

	ports->index = mi->index;
	if (mi->type == AUDIO_MIXER_ENUM) {
		ports->isenum = 1;
		for(i = 0; tbl[i].name; i++)
		    for(j = 0; j < mi->un.e.num_mem; j++)
			if (strcmp(mi->un.e.member[j].label.name,
							    tbl[i].name) == 0) {
				ports->allports |= tbl[i].mask;
				ports->aumask[ports->nports] = tbl[i].mask;
				ports->misel[ports->nports] =
				    mi->un.e.member[j].ord;
				ports->miport[ports->nports] =
				    au_portof(sc, mi->un.e.member[j].label.name,
				    mi->mixer_class);
				if (ports->mixerout != -1 &&
				    ports->miport[ports->nports++] != -1)
					ports->isdual = 1;
			}
	} else if (mi->type == AUDIO_MIXER_SET) {
		for(i = 0; tbl[i].name; i++)
		    for(j = 0; j < mi->un.s.num_mem; j++)
			if (strcmp(mi->un.s.member[j].label.name,
							    tbl[i].name) == 0) {
				ports->allports |= tbl[i].mask;
				ports->aumask[ports->nports] = tbl[i].mask;
				ports->misel[ports->nports] =
				    mi->un.s.member[j].mask;
				ports->miport[ports->nports++] =
				    au_portof(sc, mi->un.s.member[j].label.name,
				    mi->mixer_class);
			}
	}
}

/*
 * Called from hardware driver.  This is where the MI audio driver gets
 * probed/attached to the hardware driver.
 */
struct device *
audio_attach_mi(struct audio_hw_if *ahwp, void *hdlp, struct device *dev)
{
	struct audio_attach_args arg;

#ifdef DIAGNOSTIC
	if (ahwp == NULL) {
		aprint_error("audio_attach_mi: NULL\n");
		return (0);
	}
#endif
	arg.type = AUDIODEV_TYPE_AUDIO;
	arg.hwif = ahwp;
	arg.hdl = hdlp;
	return (config_found(dev, &arg, audioprint));
}

#ifdef AUDIO_DEBUG
void	audio_printsc(struct audio_softc *);
void	audio_print_params(char *, struct audio_params *);

void
audio_printsc(struct audio_softc *sc)
{
	printf("hwhandle %p hw_if %p ", sc->hw_hdl, sc->hw_if);
	printf("open 0x%x mode 0x%x\n", sc->sc_open, sc->sc_mode);
	printf("rchan 0x%x wchan 0x%x ", sc->sc_rchan, sc->sc_wchan);
	printf("rring used 0x%x pring used=%d\n",
	       sc->sc_rr.used, sc->sc_pr.used);
	printf("rbus 0x%x pbus 0x%x ", sc->sc_rbus, sc->sc_pbus);
	printf("blksize %d", sc->sc_pr.blksize);
	printf("hiwat %d lowat %d\n", sc->sc_pr.usedhigh, sc->sc_pr.usedlow);
}

void
audio_print_params(char *s, struct audio_params *p)
{
	printf("audio: %s sr=%ld, enc=%d, chan=%d, prec=%d\n", s,
	       p->sample_rate, p->encoding, p->channels, p->precision);
}
#endif

int
audio_alloc_ring(struct audio_softc *sc, struct audio_ringbuffer *r,
		 int direction, size_t bufsize)
{
	struct audio_hw_if *hw = sc->hw_if;
	void *hdl = sc->hw_hdl;
	/*
	 * Alloc DMA play and record buffers
	 */
	if (bufsize < AUMINBUF)
		bufsize = AUMINBUF;
	ROUNDSIZE(bufsize);
	if (hw->round_buffersize)
		bufsize = hw->round_buffersize(hdl, direction, bufsize);
	if (hw->allocm)
		r->start = hw->allocm(hdl, direction, bufsize,
				      M_DEVBUF, M_WAITOK);
	else
		r->start = malloc(bufsize, M_DEVBUF, M_WAITOK);
	if (r->start == 0)
		return ENOMEM;
	r->bufsize = bufsize;
	return 0;
}

void
audio_free_ring(struct audio_softc *sc, struct audio_ringbuffer *r)
{

	if (sc->hw_if->freem)
		sc->hw_if->freem(sc->hw_hdl, r->start, M_DEVBUF);
	else
		free(r->start, M_DEVBUF);
	r->start = 0;
}

int
audioopen(dev_t dev, int flags, int ifmt, struct proc *p)
{
	struct audio_softc *sc;
	int error;

	sc = device_lookup(&audio_cd, AUDIOUNIT(dev));
	if (sc == NULL)
		return (ENXIO);

	if (sc->sc_dying)
		return (EIO);

	sc->sc_refcnt++;
	switch (AUDIODEV(dev)) {
	case SOUND_DEVICE:
	case AUDIO_DEVICE:
		error = audio_open(dev, sc, flags, ifmt, p);
		break;
	case AUDIOCTL_DEVICE:
		error = 0;
		break;
	case MIXER_DEVICE:
		error = mixer_open(dev, sc, flags, ifmt, p);
		break;
	default:
		error = ENXIO;
		break;
	}
	if (--sc->sc_refcnt < 0)
		wakeup(&sc->sc_refcnt);
	return (error);
}

int
audioclose(dev_t dev, int flags, int ifmt, struct proc *p)
{
	int unit = AUDIOUNIT(dev);
	struct audio_softc *sc = audio_cd.cd_devs[unit];
	int error;

	switch (AUDIODEV(dev)) {
	case SOUND_DEVICE:
	case AUDIO_DEVICE:
		error = audio_close(sc, flags, ifmt, p);
		break;
	case MIXER_DEVICE:
		error = mixer_close(sc, flags, ifmt, p);
		break;
	case AUDIOCTL_DEVICE:
		error = 0;
		break;
	default:
		error = ENXIO;
		break;
	}
	return (error);
}

int
audioread(dev_t dev, struct uio *uio, int ioflag)
{
	struct audio_softc *sc;
	int error;

	sc = device_lookup(&audio_cd, AUDIOUNIT(dev));
	if (sc == NULL)
		return (ENXIO);

	if (sc->sc_dying)
		return (EIO);

	sc->sc_refcnt++;
	switch (AUDIODEV(dev)) {
	case SOUND_DEVICE:
	case AUDIO_DEVICE:
		error = audio_read(sc, uio, ioflag);
		break;
	case AUDIOCTL_DEVICE:
	case MIXER_DEVICE:
		error = ENODEV;
		break;
	default:
		error = ENXIO;
		break;
	}
	if (--sc->sc_refcnt < 0)
		wakeup(&sc->sc_refcnt);
	return (error);
}

int
audiowrite(dev_t dev, struct uio *uio, int ioflag)
{
	struct audio_softc *sc;
	int error;

	sc = device_lookup(&audio_cd, AUDIOUNIT(dev));
	if (sc == NULL)
		return (ENXIO);

	if (sc->sc_dying)
		return (EIO);

	sc->sc_refcnt++;
	switch (AUDIODEV(dev)) {
	case SOUND_DEVICE:
	case AUDIO_DEVICE:
		error = audio_write(sc, uio, ioflag);
		break;
	case AUDIOCTL_DEVICE:
	case MIXER_DEVICE:
		error = ENODEV;
		break;
	default:
		error = ENXIO;
		break;
	}
	if (--sc->sc_refcnt < 0)
		wakeup(&sc->sc_refcnt);
	return (error);
}

int
audioioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
{
	int unit = AUDIOUNIT(dev);
	struct audio_softc *sc = audio_cd.cd_devs[unit];
	int error;

	if (sc->sc_dying)
		return (EIO);

	sc->sc_refcnt++;
	switch (AUDIODEV(dev)) {
	case SOUND_DEVICE:
	case AUDIO_DEVICE:
	case AUDIOCTL_DEVICE:
		error = audio_ioctl(sc, cmd, addr, flag, p);
		break;
	case MIXER_DEVICE:
		error = mixer_ioctl(sc, cmd, addr, flag, p);
		break;
	default:
		error = ENXIO;
		break;
	}
	if (--sc->sc_refcnt < 0)
		wakeup(&sc->sc_refcnt);
	return (error);
}

int
audiopoll(dev_t dev, int events, struct proc *p)
{
	int unit = AUDIOUNIT(dev);
	struct audio_softc *sc = audio_cd.cd_devs[unit];
	int error;

	if (sc->sc_dying)
		return (EIO);

	sc->sc_refcnt++;
	switch (AUDIODEV(dev)) {
	case SOUND_DEVICE:
	case AUDIO_DEVICE:
		error = audio_poll(sc, events, p);
		break;
	case AUDIOCTL_DEVICE:
	case MIXER_DEVICE:
		error = ENODEV;
		break;
	default:
		error = ENXIO;
		break;
	}
	if (--sc->sc_refcnt < 0)
		wakeup(&sc->sc_refcnt);
	return (error);
}

int
audiokqfilter(dev_t dev, struct knote *kn)
{
	int unit = AUDIOUNIT(dev);  
	struct audio_softc *sc = audio_cd.cd_devs[unit];
	int rv;

	if (sc->sc_dying)
		return (1);

	sc->sc_refcnt++;
	switch (AUDIODEV(dev)) {
	case SOUND_DEVICE:
	case AUDIO_DEVICE:
		rv = audio_kqfilter(sc, kn);
		break;
	case AUDIOCTL_DEVICE:
	case MIXER_DEVICE:
		rv = 1;
		break;
	default:
		rv = 1;
	}
	if (--sc->sc_refcnt < 0)
		wakeup(&sc->sc_refcnt);
	return (rv);
}

paddr_t
audiommap(dev_t dev, off_t off, int prot)
{
	int unit = AUDIOUNIT(dev);
	struct audio_softc *sc = audio_cd.cd_devs[unit];
	paddr_t error;

	if (sc->sc_dying)
		return (-1);

	sc->sc_refcnt++;
	switch (AUDIODEV(dev)) {
	case SOUND_DEVICE:
	case AUDIO_DEVICE:
		error = audio_mmap(sc, off, prot);
		break;
	case AUDIOCTL_DEVICE:
	case MIXER_DEVICE:
		error = -1;
		break;
	default:
		error = -1;
		break;
	}
	if (--sc->sc_refcnt < 0)
		wakeup(&sc->sc_refcnt);
	return (error);
}

/*
 * Audio driver
 */
void
audio_init_ringbuffer(struct audio_softc *sc, struct audio_ringbuffer *rp)
{
	int nblks;
	int blksize = rp->blksize;

	if (blksize < AUMINBLK)
		blksize = AUMINBLK;
	if (blksize > rp->bufsize / AUMINNOBLK)
		blksize = rp->bufsize / AUMINNOBLK;
	ROUNDSIZE(blksize);
	if (sc->hw_if->round_blocksize)
		blksize = sc->hw_if->round_blocksize(sc->hw_hdl, blksize);
	if (blksize <= 0)
		panic("audio_init_ringbuffer: blksize");
	nblks = rp->bufsize / blksize;

	DPRINTF(("audio_init_ringbuffer: blksize=%d\n", blksize));
	rp->blksize = blksize;
	rp->maxblks = nblks;
	rp->used = 0;
	rp->end = rp->start + nblks * blksize;
	rp->inp = rp->outp = rp->start;
	rp->stamp = 0;
	rp->drops = 0;
	rp->pause = 0;
	rp->copying = 0;
	rp->needfill = 0;
	rp->mmapped = 0;
}

int
audio_initbufs(struct audio_softc *sc)
{
	struct audio_hw_if *hw = sc->hw_if;
	int error;

	DPRINTF(("audio_initbufs: mode=0x%x\n", sc->sc_mode));
	audio_init_ringbuffer(sc, &sc->sc_rr);
#if NAURATECONV > 0
	auconv_init_context(&sc->sc_rconv, sc->sc_rparams.hw_sample_rate,
			    sc->sc_rparams.sample_rate,
			    sc->sc_rr.start, sc->sc_rr.end);
#endif
	if (hw->init_input && (sc->sc_mode & AUMODE_RECORD)) {
		error = hw->init_input(sc->hw_hdl, sc->sc_rr.start,
				       sc->sc_rr.end - sc->sc_rr.start);
		if (error)
			return error;
	}

	audio_init_ringbuffer(sc, &sc->sc_pr);
#if NAURATECONV > 0
	auconv_init_context(&sc->sc_pconv, sc->sc_pparams.sample_rate,
			    sc->sc_pparams.hw_sample_rate,
			    sc->sc_pr.start, sc->sc_pr.end);
#endif
	sc->sc_sil_count = 0;
	if (hw->init_output && (sc->sc_mode & AUMODE_PLAY)) {
		error = hw->init_output(sc->hw_hdl, sc->sc_pr.start,
					sc->sc_pr.end - sc->sc_pr.start);
		if (error)
			return error;
	}

#ifdef AUDIO_INTR_TIME
#define double u_long
	sc->sc_pnintr = 0;
	sc->sc_pblktime = (u_long)(
	    (double)sc->sc_pr.blksize * 100000 /
	    (double)(sc->sc_pparams.precision / NBBY *
		     sc->sc_pparams.channels *
		     sc->sc_pparams.sample_rate)) * 10;
	DPRINTF(("audio: play blktime = %lu for %d\n",
		 sc->sc_pblktime, sc->sc_pr.blksize));
	sc->sc_rnintr = 0;
	sc->sc_rblktime = (u_long)(
	    (double)sc->sc_rr.blksize * 100000 /
	    (double)(sc->sc_rparams.precision / NBBY *
		     sc->sc_rparams.channels *
		     sc->sc_rparams.sample_rate)) * 10;
	DPRINTF(("audio: record blktime = %lu for %d\n",
		 sc->sc_rblktime, sc->sc_rr.blksize));
#undef double
#endif

	return 0;
}

void
audio_calcwater(struct audio_softc *sc)
{
	sc->sc_pr.usedhigh = sc->sc_pr.end - sc->sc_pr.start;
	sc->sc_pr.usedlow = sc->sc_pr.usedhigh * 3 / 4;	/* set low at 75% */
	if (sc->sc_pr.usedlow == sc->sc_pr.usedhigh)
		sc->sc_pr.usedlow -= sc->sc_pr.blksize;
	sc->sc_rr.usedhigh =
		sc->sc_rr.end - sc->sc_rr.start - sc->sc_rr.blksize;
	sc->sc_rr.usedlow = 0;
}

static __inline int
audio_sleep_timo(int *chan, char *label, int timo)
{
	int st;

	if (!label)
		label = "audio";

	DPRINTFN(3, ("audio_sleep_timo: chan=%p, label=%s, timo=%d\n",
		     chan, label, timo));
	*chan = 1;
	st = tsleep(chan, PWAIT | PCATCH, label, timo);
	*chan = 0;
#ifdef AUDIO_DEBUG
	if (st != 0 && st != EINTR)
	    DPRINTF(("audio_sleep: woke up st=%d\n", st));
#endif
	return (st);
}

static __inline int
audio_sleep(int *chan, char *label)
{
	return audio_sleep_timo(chan, label, 0);
}

/* call at splaudio() */
static __inline void
audio_wakeup(int *chan)
{
	DPRINTFN(3, ("audio_wakeup: chan=%p, *chan=%d\n", chan, *chan));
	if (*chan) {
		wakeup(chan);
		*chan = 0;
	}
}

int
audio_open(dev_t dev, struct audio_softc *sc, int flags, int ifmt,
	   struct proc *p)
{
	int error;
	u_int mode;
	struct audio_hw_if *hw;

	hw = sc->hw_if;
	if (!hw)
		return ENXIO;

	DPRINTF(("audio_open: flags=0x%x sc=%p hdl=%p\n",
		 flags, sc, sc->hw_hdl));

	if ((sc->sc_open & (AUOPEN_READ|AUOPEN_WRITE)) != 0)
		return (EBUSY);

	error = hw->open(sc->hw_hdl, flags);
	if (error)
		return (error);

	sc->sc_async_audio = 0;
	sc->sc_rchan = 0;
	sc->sc_wchan = 0;
	sc->sc_sil_count = 0;
	sc->sc_rbus = 0;
	sc->sc_pbus = 0;
	sc->sc_eof = 0;
	sc->sc_playdrop = 0;

	sc->sc_full_duplex = 0;
/* doesn't always work right on SB.
		(flags & (FWRITE|FREAD)) == (FWRITE|FREAD) &&
		(hw->get_props(sc->hw_hdl) & AUDIO_PROP_FULLDUPLEX);
*/

	mode = 0;
	if (flags & FREAD) {
		sc->sc_open |= AUOPEN_READ;
		mode |= AUMODE_RECORD;
	}
	if (flags & FWRITE) {
		sc->sc_open |= AUOPEN_WRITE;
		mode |= AUMODE_PLAY | AUMODE_PLAY_ALL;
	}

	/*
	 * Multiplex device: /dev/audio (MU-Law) and /dev/sound (linear)
	 * The /dev/audio is always (re)set to 8-bit MU-Law mono
	 * For the other devices, you get what they were last set to.
	 */
	if (ISDEVAUDIO(dev)) {
		error = audio_set_defaults(sc, mode);
	} else {
		struct audio_info ai;

		AUDIO_INITINFO(&ai);
		ai.mode = mode;
		error = audiosetinfo(sc, &ai);
	}
	if (error)
		goto bad;

#ifdef DIAGNOSTIC
	/*
	 * Sample rate and precision are supposed to be set to proper
	 * default values by the hardware driver, so that it may give
	 * us these values.
	 */
	if (sc->sc_rparams.precision == 0 || sc->sc_pparams.precision == 0) {
		printf("audio_open: 0 precision\n");
		return EINVAL;
	}
#endif

	/* audio_close() decreases sc_pr.usedlow, recalculate here */
	audio_calcwater(sc);

	DPRINTF(("audio_open: done sc_mode = 0x%x\n", sc->sc_mode));

	return 0;

bad:
	hw->close(sc->hw_hdl);
	sc->sc_open = 0;
	sc->sc_mode = 0;
	sc->sc_full_duplex = 0;
	return error;
}

/*
 * Must be called from task context.
 */
void
audio_init_record(struct audio_softc *sc)
{
	int s = splaudio();

	if (sc->hw_if->speaker_ctl &&
	    (!sc->sc_full_duplex || (sc->sc_mode & AUMODE_PLAY) == 0))
		sc->hw_if->speaker_ctl(sc->hw_hdl, SPKR_OFF);
	sc->sc_rconvbuffer_begin = 0;
	sc->sc_rconvbuffer_end = 0;
	splx(s);
}

/*
 * Must be called from task context.
 */
void
audio_init_play(struct audio_softc *sc)
{
	int s = splaudio();

	sc->sc_wstamp = sc->sc_pr.stamp;
	if (sc->hw_if->speaker_ctl)
		sc->hw_if->speaker_ctl(sc->hw_hdl, SPKR_ON);
	sc->sc_input_fragment_length = 0;
	splx(s);
}

int
audio_drain(struct audio_softc *sc)
{
	int error, drops;
	struct audio_ringbuffer *cb = &sc->sc_pr;
	int s;

	DPRINTF(("audio_drain: enter busy=%d used=%d\n",
		 sc->sc_pbus, sc->sc_pr.used));
	if (sc->sc_pr.mmapped || sc->sc_pr.used <= 0)
		return 0;
	if (!sc->sc_pbus) {
		/* We've never started playing, probably because the
		 * block was too short.  Pad it and start now.
		 */
		int cc;
		u_char *inp = cb->inp;

		cc = cb->blksize - (inp - cb->start) % cb->blksize;
		audio_fill_silence(&sc->sc_pparams, inp, cc);
		inp += cc;
		if (inp >= cb->end)
			inp = cb->start;
		s = splaudio();
		cb->used += cc;
		cb->inp = inp;
		error = audiostartp(sc);
		splx(s);
		if (error)
			return error;
	}
	/*
	 * Play until a silence block has been played, then we
	 * know all has been drained.
	 * XXX This should be done some other way to avoid
	 * playing silence.
	 */
#ifdef DIAGNOSTIC
	if (cb->copying) {
		printf("audio_drain: copying in progress!?!\n");
		cb->copying = 0;
	}
#endif
	drops = cb->drops;
	error = 0;
	s = splaudio();
	while (cb->drops == drops && !error) {
		DPRINTF(("audio_drain: used=%d, drops=%ld\n",
			 sc->sc_pr.used, cb->drops));
		/*
		 * When the process is exiting, it ignores all signals and
		 * we can't interrupt this sleep, so we set a timeout
		 * just in case.
		 */
		error = audio_sleep_timo(&sc->sc_wchan, "aud_dr", 30*hz);
		if (sc->sc_dying)
			error = EIO;
	}
	splx(s);
	return error;
}

/*
 * Close an audio chip.
 */
/* ARGSUSED */
int
audio_close(struct audio_softc *sc, int flags, int ifmt, struct proc *p)
{
	struct audio_hw_if *hw = sc->hw_if;
	int s;

	DPRINTF(("audio_close: sc=%p\n", sc));

	s = splaudio();
	/* Stop recording. */
	if ((flags & FREAD) && sc->sc_rbus) {
		/*
		 * XXX Some drivers (e.g. SB) use the same routine
		 * to halt input and output so don't halt input if
		 * in full duplex mode.  These drivers should be fixed.
		 */
		if (!sc->sc_full_duplex ||
		    sc->hw_if->halt_input != sc->hw_if->halt_output)
			sc->hw_if->halt_input(sc->hw_hdl);
		sc->sc_rbus = 0;
	}
	/*
	 * Block until output drains, but allow ^C interrupt.
	 */
	sc->sc_pr.usedlow = sc->sc_pr.blksize;	/* avoid excessive wakeups */
	/*
	 * If there is pending output, let it drain (unless
	 * the output is paused).
	 */
	if ((flags & FWRITE) && sc->sc_pbus) {
		if (!sc->sc_pr.pause && !audio_drain(sc) && hw->drain)
			(void)hw->drain(sc->hw_hdl);
		sc->hw_if->halt_output(sc->hw_hdl);
		sc->sc_pbus = 0;
	}

	hw->close(sc->hw_hdl);

	if (flags & FREAD) {
		sc->sc_open &= ~AUOPEN_READ;
		sc->sc_mode &= ~AUMODE_RECORD;
	}
	if (flags & FWRITE) {
		sc->sc_open &= ~AUOPEN_WRITE;
		sc->sc_mode &= ~(AUMODE_PLAY|AUMODE_PLAY_ALL);
	}

	sc->sc_async_audio = 0;
	sc->sc_full_duplex = 0;
	splx(s);
	DPRINTF(("audio_close: done\n"));

	return (0);
}

int
audio_read(struct audio_softc *sc, struct uio *uio, int ioflag)
{
	struct audio_ringbuffer *cb = &sc->sc_rr;
	u_char *outp;
	int error, s, used, cc, n;
	const struct audio_params *params;
	int hw_bits_per_sample;

	if (cb->mmapped)
		return EINVAL;

	DPRINTFN(1,("audio_read: cc=%lu mode=%d\n",
		    (unsigned long)uio->uio_resid, sc->sc_mode));

	params = &sc->sc_rparams;
	switch (params->hw_encoding) {
	case AUDIO_ENCODING_SLINEAR_LE:
	case AUDIO_ENCODING_SLINEAR_BE:
	case AUDIO_ENCODING_ULINEAR_LE:
	case AUDIO_ENCODING_ULINEAR_BE:
		hw_bits_per_sample = params->hw_channels * params->precision
			* params->factor;
		break;
	default:
		hw_bits_per_sample = 8 * params->factor / params->factor_denom;
	}
	error = 0;
	/*
	 * If hardware is half-duplex and currently playing, return
	 * silence blocks based on the number of blocks we have output.
	 */
	if (!sc->sc_full_duplex &&
	    (sc->sc_mode & AUMODE_PLAY)) {
		while (uio->uio_resid > 0 && !error) {
			s = splaudio();
			for(;;) {
				cc = sc->sc_pr.stamp - sc->sc_wstamp;
				if (cc > 0)
					break;
				DPRINTF(("audio_read: stamp=%lu, wstamp=%lu\n",
					 sc->sc_pr.stamp, sc->sc_wstamp));
				if (ioflag & IO_NDELAY) {
					splx(s);
					return (EWOULDBLOCK);
				}
				error = audio_sleep(&sc->sc_rchan, "aud_hr");
				if (sc->sc_dying)
					error = EIO;
				if (error) {
					splx(s);
					return (error);
				}
			}
			splx(s);

			if (uio->uio_resid < cc)
				cc = uio->uio_resid;
			DPRINTFN(1,("audio_read: reading in write mode, "
				    "cc=%d\n", cc));
			error = audio_silence_copyout(sc, cc, uio);
			sc->sc_wstamp += cc;
		}
		return (error);
	}
	while (uio->uio_resid > 0 && !error) {
		if (sc->sc_rconvbuffer_end - sc->sc_rconvbuffer_begin <= 0) {
			s = splaudio();
			while (cb->used * 8 < hw_bits_per_sample) {
				if (!sc->sc_rbus) {
					error = audiostartr(sc);
					if (error) {
						splx(s);
						return (error);
					}
				}
				if (ioflag & IO_NDELAY) {
					splx(s);
					return (EWOULDBLOCK);
				}
				DPRINTFN(1, ("audio_read: sleep used=%d\n",
					     cb->used));
				error = audio_sleep(&sc->sc_rchan, "aud_rd");
				if (sc->sc_dying)
					error = EIO;
				if (error) {
					splx(s);
					return error;
				}
			}

			/*
			 * Move data in the ring buffer to sc_rconvbuffer as
			 * possible with/without rate conversion.
			 */
			used = cb->used;
			outp = cb->outp;
			cb->copying = 1;
			splx(s);
			cc = used - cb->usedlow; /* maximum to read */
			if (cc > sc->sc_rconvbuffer_size)
				cc = sc->sc_rconvbuffer_size;
			n = cc * params->factor / params->factor_denom;
			if (n < cc)
				cc = n;
			/* cc must be aligned by the sample size */
			cc = (cc * 8 / hw_bits_per_sample) * hw_bits_per_sample / 8;
#ifdef DIAGNOSTIC
			if (cc == 0)
				printf("audio_read: cc=0 hw_bits_per_sample=%d\n",
				       hw_bits_per_sample);
#endif

			/*
			 * The format of data in the ring buffer is
			 * [hw_sample_rate, hw_encoding, hw_precision, hw_channels]
			 */
#if NAURATECONV > 0
			sc->sc_rconvbuffer_end =
				auconv_record(&sc->sc_rconv, params,
					      sc->sc_rconvbuffer, outp, cc);
#else
			n = cb->end - outp;
			if (cc <= n) {
				memcpy(sc->sc_rconvbuffer, outp, cc);
			} else {
				memcpy(sc->sc_rconvbuffer, outp, n);
				memcpy(sc->sc_rconvbuffer + n, cb->start,
				       cc - n);
			}
			sc->sc_rconvbuffer_end = cc;
#endif /* !NAURATECONV */
			/*
			 * The format of data in sc_rconvbuffer is
			 * [sample_rate, hw_encoding, hw_precision, channels]
			 */
			outp += cc;
			if (outp >= cb->end)
				outp -= cb->end - cb->start;
			s = splaudio();
			cb->outp = outp;
			cb->used -= cc;
			cb->copying = 0;
			splx(s);

			if (params->sw_code) {
				cc = sc->sc_rconvbuffer_end;
#ifdef DIAGNOSTIC
				if (cc % params->factor != 0)
					printf("audio_read: cc is not aligned"
					       ": cc=%d factor=%d\n", cc,
					       params->factor);
#endif
				cc = cc * params->factor_denom / params->factor;
#ifdef DIAGNOSTIC
				if (cc == 0)
					printf("audio_read: cc=0 "
					       "factor=%d/%d\n",
					       params->factor,
					       params->factor_denom);
#endif
				params->sw_code(sc->hw_hdl, sc->sc_rconvbuffer,
						cc);
				sc->sc_rconvbuffer_end = cc;
			}
			sc->sc_rconvbuffer_begin = 0;
			/*
			 * The format of data in sc_rconvbuffer is
			 * [sample_rate, encoding, precision, channels]
			 */
		}

		cc = sc->sc_rconvbuffer_end - sc->sc_rconvbuffer_begin;
		if (uio->uio_resid < cc)
			cc = uio->uio_resid; /* and no more than we want */

		DPRINTFN(0,("audio_read: buffer=%p[%d] (~ %d), cc=%d\n",
			    sc->sc_rconvbuffer, sc->sc_rconvbuffer_begin,
			    sc->sc_rconvbuffer_end, cc));
		n = uio->uio_resid;
		error = uiomove(sc->sc_rconvbuffer + sc->sc_rconvbuffer_begin,
				cc, uio);
		cc = n - uio->uio_resid; /* number of bytes actually moved */
		sc->sc_rconvbuffer_begin += cc;

	}
	return (error);
}

void
audio_clear(struct audio_softc *sc)
{
	int s = splaudio();

	if (sc->sc_rbus) {
		audio_wakeup(&sc->sc_rchan);
		sc->hw_if->halt_input(sc->hw_hdl);
		sc->sc_rbus = 0;
	}
	if (sc->sc_pbus) {
		audio_wakeup(&sc->sc_wchan);
		sc->hw_if->halt_output(sc->hw_hdl);
		sc->sc_pbus = 0;
	}
	splx(s);
}

void
audio_calc_blksize(struct audio_softc *sc, int mode)
{
	struct audio_params *parm;
	struct audio_ringbuffer *rb;

	if (sc->sc_blkset)
		return;

	if (mode == AUMODE_PLAY) {
		parm = &sc->sc_pparams;
		rb = &sc->sc_pr;
	} else {
		parm = &sc->sc_rparams;
		rb = &sc->sc_rr;
	}

	rb->blksize = parm->hw_sample_rate * audio_blk_ms / 1000 *
	     parm->hw_channels * parm->precision / NBBY *
	     parm->factor;

	DPRINTF(("audio_calc_blksize: %s blksize=%d\n",
		 mode == AUMODE_PLAY ? "play" : "record", rb->blksize));
}

void
audio_fill_silence(struct audio_params *params, u_char *p, int n)
{
	u_char auzero0, auzero1 = 0; /* initialize to please gcc */
	int nfill = 1;

	switch (params->hw_encoding) {
	case AUDIO_ENCODING_ULAW:
		auzero0 = 0x7f;
		break;
	case AUDIO_ENCODING_ALAW:
		auzero0 = 0x55;
		break;
	case AUDIO_ENCODING_MPEG_L1_STREAM:
	case AUDIO_ENCODING_MPEG_L1_PACKETS:
	case AUDIO_ENCODING_MPEG_L1_SYSTEM:
	case AUDIO_ENCODING_MPEG_L2_STREAM:
	case AUDIO_ENCODING_MPEG_L2_PACKETS:
	case AUDIO_ENCODING_MPEG_L2_SYSTEM:
	case AUDIO_ENCODING_ADPCM: /* is this right XXX */
	case AUDIO_ENCODING_SLINEAR_LE:
	case AUDIO_ENCODING_SLINEAR_BE:
		auzero0 = 0;/* fortunately this works for any number of bits */
		break;
	case AUDIO_ENCODING_ULINEAR_LE:
	case AUDIO_ENCODING_ULINEAR_BE:
		if (params->hw_precision > 8) {
			nfill = (params->hw_precision + NBBY - 1)/ NBBY;
			auzero0 = 0x80;
			auzero1 = 0;
		} else
			auzero0 = 0x80;
		break;
	default:
		DPRINTF(("audio: bad encoding %d\n", params->encoding));
		auzero0 = 0;
		break;
	}
	if (nfill == 1) {
		while (--n >= 0)
			*p++ = auzero0; /* XXX memset */
	} else /* nfill must no longer be 2 */ {
		if (params->hw_encoding == AUDIO_ENCODING_ULINEAR_LE) {
			int k = nfill;
			while (--k > 0)
				*p++ = auzero1;
			n -= nfill - 1;
		}
		while (n >= nfill) {
			int k = nfill;
			*p++ = auzero0;
			while (--k > 0)
				*p++ = auzero1;

			n -= nfill;
		}
		if (n-- > 0)	/* XXX must be 1 - DIAGNOSTIC check? */
			*p++ = auzero0;
	}
}

int
audio_silence_copyout(struct audio_softc *sc, int n, struct uio *uio)
{
	int error;
	int k;
	u_char zerobuf[128];

	audio_fill_silence(&sc->sc_rparams, zerobuf, sizeof zerobuf);

	error = 0;
	while (n > 0 && uio->uio_resid > 0 && !error) {
		k = min(n, min(uio->uio_resid, sizeof zerobuf));
		error = uiomove(zerobuf, k, uio);
		n -= k;
	}
	return (error);
}

int
audio_write(struct audio_softc *sc, struct uio *uio, int ioflag)
{
	struct audio_ringbuffer *cb = &sc->sc_pr;
	u_char *inp, *einp;
	int saveerror, error, s, n, cc, used;
	struct audio_params *params;
	int samples, hw_bits_per_sample, user_bits_per_sample;
	int input_remain, space;

	DPRINTFN(2,("audio_write: sc=%p count=%lu used=%d(hi=%d)\n",
		    sc, (unsigned long)uio->uio_resid, sc->sc_pr.used,
		    sc->sc_pr.usedhigh));

	if (cb->mmapped)
		return EINVAL;

	if (uio->uio_resid == 0) {
		sc->sc_eof++;
		return 0;
	}

	/*
	 * If half-duplex and currently recording, throw away data.
	 */
	if (!sc->sc_full_duplex &&
	    (sc->sc_mode & AUMODE_RECORD)) {
		uio->uio_offset += uio->uio_resid;
		uio->uio_resid = 0;
		DPRINTF(("audio_write: half-dpx read busy\n"));
		return (0);
	}

	if (!(sc->sc_mode & AUMODE_PLAY_ALL) && sc->sc_playdrop > 0) {
		n = min(sc->sc_playdrop, uio->uio_resid);
		DPRINTF(("audio_write: playdrop %d\n", n));
		uio->uio_offset += n;
		uio->uio_resid -= n;
		sc->sc_playdrop -= n;
		if (uio->uio_resid == 0)
			return 0;
	}

	params = &sc->sc_pparams;
	DPRINTFN(1, ("audio_write: sr=%ld, enc=%d, prec=%d, chan=%d, sw=%p, "
		     "fact=%d\n",
		     sc->sc_pparams.sample_rate, sc->sc_pparams.encoding,
		     sc->sc_pparams.precision, sc->sc_pparams.channels,
		     sc->sc_pparams.sw_code, sc->sc_pparams.factor));

	/*
	 * For some encodings, handle data in sample unit.
	 */
	switch (params->hw_encoding) {
	case AUDIO_ENCODING_SLINEAR_LE:
	case AUDIO_ENCODING_SLINEAR_BE:
	case AUDIO_ENCODING_ULINEAR_LE:
	case AUDIO_ENCODING_ULINEAR_BE:
		hw_bits_per_sample = params->hw_channels * params->precision
			* params->factor;
		user_bits_per_sample = params->channels * params->precision;
		break;
	default:
		hw_bits_per_sample = 8 * params->factor / params->factor_denom;
		user_bits_per_sample = 8;
	}
#ifdef DIAGNOSTIC
	if (hw_bits_per_sample > MAX_SAMPLE_SIZE * 8) {
		printf("audio_write(): Invalid sample size: cur=%d max=%d\n",
		       hw_bits_per_sample / 8, MAX_SAMPLE_SIZE);
	}
#endif
	space = ((params->hw_sample_rate / params->sample_rate) + 1)
		* hw_bits_per_sample / 8;
	error = 0;
	while ((input_remain = uio->uio_resid + sc->sc_input_fragment_length) > 0
	       && !error) {
		s = splaudio();
		if (input_remain < user_bits_per_sample / 8) {
			n = uio->uio_resid;
			DPRINTF(("audio_write: fragment uiomove length=%d\n", n));
			error = uiomove(sc->sc_input_fragment
					+ sc->sc_input_fragment_length,
					n, uio);
			if (!error)
				sc->sc_input_fragment_length += n;
			splx(s);
			return (error);
		}
		while (cb->used + space >= cb->usedhigh) {
			DPRINTFN(2, ("audio_write: sleep used=%d lowat=%d "
				     "hiwat=%d\n",
				     cb->used, cb->usedlow, cb->usedhigh));
			if (ioflag & IO_NDELAY) {
				splx(s);
				return (EWOULDBLOCK);
			}
			error = audio_sleep(&sc->sc_wchan, "aud_wr");
			if (sc->sc_dying)
				error = EIO;
			if (error) {
				splx(s);
				return (error);
			}
		}
		used = cb->used;
		inp = cb->inp;
		cb->copying = 1;
		splx(s);
		cc = cb->usedhigh - used;	/* maximum to write */
		/* cc may be greater than the size of the ring buffer */
		if (cc > cb->end - cb->start)
			cc = cb->end - cb->start;

		/* cc: # of bytes we can write to the ring buffer */
		samples = cc * 8 / hw_bits_per_sample;
#ifdef DIAGNOSTIC
		if (samples == 0)
			printf("audio_write: samples (cc/hw_bps) == 0\n");
#endif
		/* samples: # of samples we can write to the ring buffer */
		samples = samples * params->sample_rate / params->hw_sample_rate;
#ifdef DIAGNOSTIC
		if (samples == 0)
			printf("audio_write: samples (rate/hw_rate) == 0 "
			       "usedhigh-used=%d cc/hw_bps=%d/%d "
			       "rate/hw_rate=%ld/%ld space=%d\n",
			       cb->usedhigh - cb->used, cc,
			       hw_bits_per_sample / 8, params->sample_rate,
			       params->hw_sample_rate, space);
#endif
		/* samples: # of samples in source data */
		cc = samples * user_bits_per_sample / 8;
		/* cc: # of bytes in source data */
		if (input_remain < cc)	/* and no more than we have */
			cc = (input_remain * 8 / user_bits_per_sample)
				* user_bits_per_sample / 8;
#ifdef DIAGNOSTIC
		if (cc == 0)
			printf("audio_write: cc == 0\n");
#endif
		if (cc * params->factor / params->factor_denom
		    > sc->sc_pconvbuffer_size) {
			/*
			 * cc = (pconv / factor / user_bps ) * user_bps
			 */
			cc = (sc->sc_pconvbuffer_size * params->factor_denom
			      * 8 / params->factor / user_bits_per_sample)
			     * user_bits_per_sample / 8;
		}

#ifdef DIAGNOSTIC
		/*
		 * This should never happen since the block size and and
		 * block pointers are always nicely aligned.
		 */
		if (cc == 0) {
			printf("audio_write: cc == 0, swcode=%p, factor=%d "
			       "remain=%d u_bps=%d hw_bps=%d\n",
			       sc->sc_pparams.sw_code, sc->sc_pparams.factor,
			       input_remain, user_bits_per_sample,
			       hw_bits_per_sample);
			cb->copying = 0;
			return EINVAL;
		}
#endif
		DPRINTFN(1, ("audio_write: uiomove cc=%d inp=%p, left=%lu\n",
			     cc, inp, (unsigned long)uio->uio_resid));
		memcpy(sc->sc_pconvbuffer, sc->sc_input_fragment,
		       sc->sc_input_fragment_length);
		cc -= sc->sc_input_fragment_length;
		n = uio->uio_resid;
		error = uiomove(sc->sc_pconvbuffer + sc->sc_input_fragment_length,
				cc, uio);
		if (cc != n - uio->uio_resid) {
			printf("audio_write: uiomove didn't move requested "
			       "amount: requested=%d, actual=%ld\n",
			       cc, (long)n - uio->uio_resid);
		}
			    /* number of bytes actually moved */
		cc = sc->sc_input_fragment_length + n - uio->uio_resid;
		sc->sc_input_fragment_length = 0;
#ifdef AUDIO_DEBUG
		if (error)
			printf("audio_write:(1) uiomove failed %d; cc=%d "
			       "inp=%p\n", error, cc, inp);
#endif
		/*
		 * Continue even if uiomove() failed because we may have
		 * gotten a partial block.
		 */

		/*
		 * The format of data in sc_pconvbuffer is:
		 * [sample_rate, encoding, precision, channels]
		 */
		if (sc->sc_pparams.sw_code) {
			sc->sc_pparams.sw_code(sc->hw_hdl,
					       sc->sc_pconvbuffer, cc);
			/* Adjust count after the expansion. */
			cc = cc * sc->sc_pparams.factor
				/ sc->sc_pparams.factor_denom;
			DPRINTFN(1, ("audio_write: expanded cc=%d\n", cc));
		}
		/*
		 * The format of data in sc_pconvbuffer is:
		 * [sample_rate, hw_encoding, hw_precision, channels]
		 */
#if NAURATECONV > 0
		cc = auconv_play(&sc->sc_pconv, params, inp,
				 sc->sc_pconvbuffer, cc);
#else
		n = cb->end - inp;
		if (cc <= n) {
			memcpy(inp, sc->sc_pconvbuffer, cc);
		} else {
			memcpy(inp, sc->sc_pconvbuffer, n);
			memcpy(cb->start, sc->sc_pconvbuffer + n, cc - n);
		}
#endif /* !NAURATECONV */
		/*
		 * The format of data in inp is:
		 * [hw_sample_rate, hw_encoding, hw_precision, hw_channels]
		 * cc is the size of data actually written to inp.
		 */

		einp = cb->inp + cc;
		if (einp >= cb->end)
			einp -= cb->end - cb->start; /* not cb->bufsize */

		s = splaudio();
		/*
		 * This is a very suboptimal way of keeping track of
		 * silence in the buffer, but it is simple.
		 */
		sc->sc_sil_count = 0;

		cb->inp = einp;
		cb->used += cc;
		/*
		 * If the interrupt routine wants the last block filled AND
		 * the copy did not fill the last block completely it needs to
		 * be padded.
		 */
		if (cb->needfill &&
		    (inp  - cb->start) / cb->blksize ==
		    (einp - cb->start) / cb->blksize) {
			/* Figure out how many bytes to a block boundary. */
			cc = cb->blksize - (einp - cb->start) % cb->blksize;
			DPRINTF(("audio_write: partial fill %d\n", cc));
		} else
			cc = 0;
		cb->needfill = 0;
		cb->copying = 0;
		if (!sc->sc_pbus && !cb->pause) {
			saveerror = error;
			error = audiostartp(sc);
			if (saveerror != 0) {
				/* Report the first error that occurred. */
				error = saveerror;
			}
		}
		splx(s);
		if (cc != 0) {
			DPRINTFN(1, ("audio_write: fill %d\n", cc));
			audio_fill_silence(&sc->sc_pparams, einp, cc);
		}
	}
	return (error);
}

int
audio_ioctl(struct audio_softc *sc, u_long cmd, caddr_t addr, int flag,
	    struct proc *p)
{
	struct audio_hw_if *hw = sc->hw_if;
	struct audio_offset *ao;
	int error = 0, s, offs, fd;
	u_long stamp;
	int rbus, pbus;

	DPRINTF(("audio_ioctl(%lu,'%c',%lu)\n",
		 IOCPARM_LEN(cmd), (char)IOCGROUP(cmd), cmd&0xff));
	switch (cmd) {
	case FIONBIO:
		/* All handled in the upper FS layer. */
		break;

	case FIONREAD:
		*(int *)addr = sc->sc_rr.used;
		break;

	case FIOASYNC:
		if (*(int *)addr) {
			if (sc->sc_async_audio)
				return (EBUSY);
			sc->sc_async_audio = p;
			DPRINTF(("audio_ioctl: FIOASYNC %p\n", p));
		} else
			sc->sc_async_audio = 0;
		break;

	case AUDIO_FLUSH:
		DPRINTF(("AUDIO_FLUSH\n"));
		rbus = sc->sc_rbus;
		pbus = sc->sc_pbus;
		audio_clear(sc);
		s = splaudio();
		error = audio_initbufs(sc);
		if (error) {
			splx(s);
			return error;
		}
		if ((sc->sc_mode & AUMODE_PLAY) && !sc->sc_pbus && pbus)
			error = audiostartp(sc);
		if (!error &&
		    (sc->sc_mode & AUMODE_RECORD) && !sc->sc_rbus && rbus)
			error = audiostartr(sc);
		splx(s);
		break;

	/*
	 * Number of read (write) samples dropped.  We don't know where or
	 * when they were dropped.
	 */
	case AUDIO_RERROR:
		*(int *)addr = sc->sc_rr.drops;
		break;

	case AUDIO_PERROR:
		*(int *)addr = sc->sc_pr.drops;
		break;

	/*
	 * Offsets into buffer.
	 */
	case AUDIO_GETIOFFS:
		ao = (struct audio_offset *)addr;
		s = splaudio();
		/* figure out where next DMA will start */
		stamp = sc->sc_rr.stamp;
		offs = sc->sc_rr.inp - sc->sc_rr.start;
		splx(s);
		ao->samples = stamp;
		ao->deltablks =
		  (stamp / sc->sc_rr.blksize) -
		  (sc->sc_rr.stamp_last / sc->sc_rr.blksize);
		sc->sc_rr.stamp_last = stamp;
		ao->offset = offs;
		break;

	case AUDIO_GETOOFFS:
		ao = (struct audio_offset *)addr;
		s = splaudio();
		/* figure out where next DMA will start */
		stamp = sc->sc_pr.stamp;
		offs = sc->sc_pr.outp - sc->sc_pr.start + sc->sc_pr.blksize;
		splx(s);
		ao->samples = stamp;
		ao->deltablks =
		  (stamp / sc->sc_pr.blksize) -
		  (sc->sc_pr.stamp_last / sc->sc_pr.blksize);
		sc->sc_pr.stamp_last = stamp;
		if (sc->sc_pr.start + offs >= sc->sc_pr.end)
			offs = 0;
		ao->offset = offs;
		break;

	/*
	 * How many bytes will elapse until mike hears the first
	 * sample of what we write next?
	 */
	case AUDIO_WSEEK:
		*(u_long *)addr = sc->sc_rr.used;
		break;

	case AUDIO_SETINFO:
		DPRINTF(("AUDIO_SETINFO mode=0x%x\n", sc->sc_mode));
		error = audiosetinfo(sc, (struct audio_info *)addr);
		break;

	case AUDIO_GETINFO:
		DPRINTF(("AUDIO_GETINFO\n"));
		error = audiogetinfo(sc, (struct audio_info *)addr);
		break;

	case AUDIO_DRAIN:
		DPRINTF(("AUDIO_DRAIN\n"));
		error = audio_drain(sc);
		if (!error && hw->drain)
		    error = hw->drain(sc->hw_hdl);
		break;

	case AUDIO_GETDEV:
		DPRINTF(("AUDIO_GETDEV\n"));
		error = hw->getdev(sc->hw_hdl, (audio_device_t *)addr);
		break;

	case AUDIO_GETENC:
		DPRINTF(("AUDIO_GETENC\n"));
		error =
		 hw->query_encoding(sc->hw_hdl, (struct audio_encoding *)addr);
		break;

	case AUDIO_GETFD:
		DPRINTF(("AUDIO_GETFD\n"));
		*(int *)addr = sc->sc_full_duplex;
		break;

	case AUDIO_SETFD:
		DPRINTF(("AUDIO_SETFD\n"));
		fd = *(int *)addr;
		if (hw->get_props(sc->hw_hdl) & AUDIO_PROP_FULLDUPLEX) {
			if (hw->setfd)
				error = hw->setfd(sc->hw_hdl, fd);
			else
				error = 0;
			if (!error)
				sc->sc_full_duplex = fd;
		} else {
			if (fd)
				error = ENOTTY;
			else
				error = 0;
		}
		break;

	case AUDIO_GETPROPS:
		DPRINTF(("AUDIO_GETPROPS\n"));
		*(int *)addr = hw->get_props(sc->hw_hdl);
		break;

	default:
		if (hw->dev_ioctl) {
			error = hw->dev_ioctl(sc->hw_hdl, cmd, addr, flag, p);
		} else {
			DPRINTF(("audio_ioctl: unknown ioctl\n"));
			error = EINVAL;
		}
		break;
	}
	DPRINTF(("audio_ioctl(%lu,'%c',%lu) result %d\n",
		 IOCPARM_LEN(cmd), (char)IOCGROUP(cmd), cmd&0xff, error));
	return (error);
}

int
audio_poll(struct audio_softc *sc, int events, struct proc *p)
{
	int revents = 0;
	int s = splaudio();

	DPRINTF(("audio_poll: events=0x%x mode=%d\n", events, sc->sc_mode));

	if (events & (POLLIN | POLLRDNORM)) {
		/*
  		 * If half duplex and playing, audio_read() will generate
		 * silence at the play rate; poll for silence being
		 * available.  Otherwise, poll for recorded sound.
		 */
		if ((!sc->sc_full_duplex && (sc->sc_mode & AUMODE_PLAY)) ?
		    sc->sc_pr.stamp > sc->sc_wstamp :
		    sc->sc_rr.used > sc->sc_rr.usedlow)
			revents |= events & (POLLIN | POLLRDNORM);
	}

	if (events & (POLLOUT | POLLWRNORM)) {
		/*
		 * If half duplex and recording, audio_write() will throw
		 * away play data, which means we are always ready to write.
		 * Otherwise, poll for play buffer being below its low water
		 * mark.
		 */
		if ((!sc->sc_full_duplex && (sc->sc_mode & AUMODE_RECORD)) ||
		    sc->sc_pr.used <= sc->sc_pr.usedlow)
			revents |= events & (POLLOUT | POLLWRNORM);
	}

	if (revents == 0) {
		if (events & (POLLIN | POLLRDNORM))
			selrecord(p, &sc->sc_rsel);

		if (events & (POLLOUT | POLLWRNORM))
			selrecord(p, &sc->sc_wsel);
	}

	splx(s);
	return (revents);
}

static void
filt_audiordetach(struct knote *kn)
{
	struct audio_softc *sc = kn->kn_hook;
	int s;

	s = splaudio();
	SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext);
	splx(s);
}

static int
filt_audioread(struct knote *kn, long hint)
{
	struct audio_softc *sc = kn->kn_hook;
	int s;

	/* XXXLUKEM (thorpej): please make sure this is right */

	s = splaudio();
	if (sc->sc_mode & AUMODE_PLAY)
		kn->kn_data = sc->sc_pr.stamp - sc->sc_wstamp;
	else
		kn->kn_data = sc->sc_rr.used - sc->sc_rr.usedlow;
	splx(s);

	return (kn->kn_data > 0);
}

static const struct filterops audioread_filtops =
	{ 1, NULL, filt_audiordetach, filt_audioread };

static void
filt_audiowdetach(struct knote *kn)
{
	struct audio_softc *sc = kn->kn_hook;
	int s;

	s = splaudio();
	SLIST_REMOVE(&sc->sc_wsel.sel_klist, kn, knote, kn_selnext);
	splx(s);
}

static int
filt_audiowrite(struct knote *kn, long hint)
{
	struct audio_softc *sc = kn->kn_hook;
	int s;

	/* XXXLUKEM (thorpej): please make sure this is right */

	s = splaudio();
	kn->kn_data = sc->sc_pr.usedlow - sc->sc_pr.used;
	splx(s);

	return (kn->kn_data > 0);
}

static const struct filterops audiowrite_filtops =
	{ 1, NULL, filt_audiowdetach, filt_audiowrite };

int
audio_kqfilter(struct audio_softc *sc, struct knote *kn)
{
	struct klist *klist;
	int s;

	switch (kn->kn_filter) {
	case EVFILT_READ:
		klist = &sc->sc_rsel.sel_klist;
		kn->kn_fop = &audioread_filtops;
		break;

	case EVFILT_WRITE:
		klist = &sc->sc_wsel.sel_klist;
		kn->kn_fop = &audiowrite_filtops;
		break;

	default:
		return (1);
	}

	kn->kn_hook = sc;

	s = splaudio();
	SLIST_INSERT_HEAD(klist, kn, kn_selnext);
	splx(s);

	return (0);
}

paddr_t
audio_mmap(struct audio_softc *sc, off_t off, int prot)
{
	struct audio_hw_if *hw = sc->hw_if;
	struct audio_ringbuffer *cb;
	int s;

	DPRINTF(("audio_mmap: off=%lld, prot=%d\n", (long long)off, prot));

	if (!(hw->get_props(sc->hw_hdl) & AUDIO_PROP_MMAP) || !hw->mappage)
		return -1;
#if 0
/* XXX
 * The idea here was to use the protection to determine if
 * we are mapping the read or write buffer, but it fails.
 * The VM system is broken in (at least) two ways.
 * 1) If you map memory VM_PROT_WRITE you SIGSEGV
 *    when writing to it, so VM_PROT_READ|VM_PROT_WRITE
 *    has to be used for mmapping the play buffer.
 * 2) Even if calling mmap() with VM_PROT_READ|VM_PROT_WRITE
 *    audio_mmap will get called at some point with VM_PROT_READ
 *    only.
 * So, alas, we always map the play buffer for now.
 */
	if (prot == (VM_PROT_READ|VM_PROT_WRITE) ||
	    prot == VM_PROT_WRITE)
		cb = &sc->sc_pr;
	else if (prot == VM_PROT_READ)
		cb = &sc->sc_rr;
	else
		return -1;
#else
	cb = &sc->sc_pr;
#endif

	if ((u_int)off >= cb->bufsize)
		return -1;
	if (!cb->mmapped) {
		cb->mmapped = 1;
		if (cb == &sc->sc_pr) {
			audio_fill_silence(&sc->sc_pparams, cb->start,
					   cb->bufsize);
			s = splaudio();
			if (!sc->sc_pbus)
				(void)audiostartp(sc);
			splx(s);
		} else {
			s = splaudio();
			if (!sc->sc_rbus)
				(void)audiostartr(sc);
			splx(s);
		}
	}

	return hw->mappage(sc->hw_hdl, cb->start, off, prot);
}

int
audiostartr(struct audio_softc *sc)
{
	int error;

	DPRINTF(("audiostartr: start=%p used=%d(hi=%d) mmapped=%d\n",
		 sc->sc_rr.start, sc->sc_rr.used, sc->sc_rr.usedhigh,
		 sc->sc_rr.mmapped));

	if (sc->hw_if->trigger_input)
		error = sc->hw_if->trigger_input(sc->hw_hdl, sc->sc_rr.start,
		    sc->sc_rr.end, sc->sc_rr.blksize,
		    audio_rint, (void *)sc, &sc->sc_rparams);
	else
		error = sc->hw_if->start_input(sc->hw_hdl, sc->sc_rr.start,
		    sc->sc_rr.blksize, audio_rint, (void *)sc);
	if (error) {
		DPRINTF(("audiostartr failed: %d\n", error));
		return error;
	}
	sc->sc_rbus = 1;
	return 0;
}

int
audiostartp(struct audio_softc *sc)
{
	int error;

	DPRINTF(("audiostartp: start=%p used=%d(hi=%d) mmapped=%d\n",
		 sc->sc_pr.start, sc->sc_pr.used, sc->sc_pr.usedhigh,
		 sc->sc_pr.mmapped));

	if (!sc->sc_pr.mmapped && sc->sc_pr.used < sc->sc_pr.blksize) {
		wakeup(&sc->sc_wchan);
		return 0;
	}

	if (sc->hw_if->trigger_output)
		error = sc->hw_if->trigger_output(sc->hw_hdl, sc->sc_pr.start,
		    sc->sc_pr.end, sc->sc_pr.blksize,
		    audio_pint, (void *)sc, &sc->sc_pparams);
	else
		error = sc->hw_if->start_output(sc->hw_hdl, sc->sc_pr.outp,
		    sc->sc_pr.blksize, audio_pint, (void *)sc);
	if (error) {
		DPRINTF(("audiostartp failed: %d\n", error));
		return error;
	}
	sc->sc_pbus = 1;
	return 0;
}

/*
 * When the play interrupt routine finds that the write isn't keeping
 * the buffer filled it will insert silence in the buffer to make up
 * for this.  The part of the buffer that is filled with silence
 * is kept track of in a very approximate way: it starts at sc_sil_start
 * and extends sc_sil_count bytes.  If there is already silence in
 * the requested area nothing is done; so when the whole buffer is
 * silent nothing happens.  When the writer starts again sc_sil_count
 * is set to 0.
 */
/* XXX
 * Putting silence into the output buffer should not really be done
 * at splaudio, but there is no softaudio level to do it at yet.
 */
static __inline void
audio_pint_silence(struct audio_softc *sc, struct audio_ringbuffer *cb,
		   u_char *inp, int cc)
{
	u_char *s, *e, *p, *q;

	if (sc->sc_sil_count > 0) {
		s = sc->sc_sil_start; /* start of silence */
		e = s + sc->sc_sil_count; /* end of sil., may be beyond end */
		p = inp;	/* adjusted pointer to area to fill */
		if (p < s)
			p += cb->end - cb->start;
		q = p+cc;
		/* Check if there is already silence. */
		if (!(s <= p && p <  e &&
		      s <= q && q <= e)) {
			if (s <= p)
				sc->sc_sil_count = max(sc->sc_sil_count, q-s);
			DPRINTFN(5,("audio_pint_silence: fill cc=%d inp=%p, "
				    "count=%d size=%d\n",
				    cc, inp, sc->sc_sil_count,
				    (int)(cb->end - cb->start)));
			audio_fill_silence(&sc->sc_pparams, inp, cc);
		} else {
			DPRINTFN(5,("audio_pint_silence: already silent "
				    "cc=%d inp=%p\n", cc, inp));

		}
	} else {
		sc->sc_sil_start = inp;
		sc->sc_sil_count = cc;
		DPRINTFN(5, ("audio_pint_silence: start fill %p %d\n",
			     inp, cc));
		audio_fill_silence(&sc->sc_pparams, inp, cc);
	}
}

/*
 * Called from HW driver module on completion of DMA output.
 * Start output of new block, wrap in ring buffer if needed.
 * If no more buffers to play, output zero instead.
 * Do a wakeup if necessary.
 */
void
audio_pint(void *v)
{
	struct audio_softc *sc = v;
	struct audio_hw_if *hw = sc->hw_if;
	struct audio_ringbuffer *cb = &sc->sc_pr;
	u_char *inp;
	int cc, ccr;
	int blksize;
	int error;

	if (!sc->sc_open)
		return;		/* ignore interrupt if not open */

	blksize = cb->blksize;

	cb->outp += blksize;
	if (cb->outp >= cb->end)
		cb->outp = cb->start;
	cb->stamp += blksize / sc->sc_pparams.factor;
	if (cb->mmapped) {
		DPRINTFN(5, ("audio_pint: mmapped outp=%p cc=%d inp=%p\n",
			     cb->outp, blksize, cb->inp));
		if (!hw->trigger_output)
			(void)hw->start_output(sc->hw_hdl, cb->outp,
			    blksize, audio_pint, (void *)sc);
		return;
	}

#ifdef AUDIO_INTR_TIME
	{
		struct timeval tv;
		u_long t;
		microtime(&tv);
		t = tv.tv_usec + 1000000 * tv.tv_sec;
		if (sc->sc_pnintr) {
			long lastdelta, totdelta;
			lastdelta = t - sc->sc_plastintr - sc->sc_pblktime;
			if (lastdelta > sc->sc_pblktime / 3) {
				printf("audio: play interrupt(%d) off "
				       "relative by %ld us (%lu)\n",
				       sc->sc_pnintr, lastdelta,
				       sc->sc_pblktime);
			}
			totdelta = t - sc->sc_pfirstintr -
				sc->sc_pblktime * sc->sc_pnintr;
			if (totdelta > sc->sc_pblktime) {
				printf("audio: play interrupt(%d) off "
				       "absolute by %ld us (%lu) (LOST)\n",
				       sc->sc_pnintr, totdelta,
				       sc->sc_pblktime);
				sc->sc_pnintr++; /* avoid repeated messages */
			}
		} else
			sc->sc_pfirstintr = t;
		sc->sc_plastintr = t;
		sc->sc_pnintr++;
	}
#endif

	cb->used -= blksize;
	if (cb->used < blksize) {
		/* we don't have a full block to use */
		if (cb->copying) {
			/* writer is in progress, don't disturb */
			cb->needfill = 1;
			DPRINTFN(1, ("audio_pint: copying in progress\n"));
		} else {
			inp = cb->inp;
			cc = blksize - (inp - cb->start) % blksize;
			ccr = cc / sc->sc_pparams.factor;
			if (cb->pause)
				cb->pdrops += ccr;
			else {
				cb->drops += ccr;
				sc->sc_playdrop += ccr;
			}
			audio_pint_silence(sc, cb, inp, cc);
			inp += cc;
			if (inp >= cb->end)
				inp = cb->start;
			cb->inp = inp;
			cb->used += cc;

			/* Clear next block so we keep ahead of the DMA. */
			if (cb->used + cc < cb->usedhigh)
				audio_pint_silence(sc, cb, inp, blksize);
		}
	}

	DPRINTFN(5, ("audio_pint: outp=%p cc=%d\n", cb->outp, blksize));
	if (!hw->trigger_output) {
		error = hw->start_output(sc->hw_hdl, cb->outp, blksize,
		    audio_pint, (void *)sc);
		if (error) {
			/* XXX does this really help? */
			DPRINTF(("audio_pint restart failed: %d\n", error));
			audio_clear(sc);
		}
	}

	DPRINTFN(2, ("audio_pint: mode=%d pause=%d used=%d lowat=%d\n",
		     sc->sc_mode, cb->pause, cb->used, cb->usedlow));
	if ((sc->sc_mode & AUMODE_PLAY) && !cb->pause) {
		if (cb->used <= cb->usedlow) {
			audio_wakeup(&sc->sc_wchan);
			selnotify(&sc->sc_wsel, 0);
			if (sc->sc_async_audio) {
				DPRINTFN(3, ("audio_pint: sending SIGIO %p\n",
					     sc->sc_async_audio));
				psignal(sc->sc_async_audio, SIGIO);
			}
		}
	}

	/* Possible to return one or more "phantom blocks" now. */
	if (!sc->sc_full_duplex && sc->sc_rchan) {
		audio_wakeup(&sc->sc_rchan);
		selnotify(&sc->sc_rsel, 0);
		if (sc->sc_async_audio)
			psignal(sc->sc_async_audio, SIGIO);
	}
}

/*
 * Called from HW driver module on completion of DMA input.
 * Mark it as input in the ring buffer (fiddle pointers).
 * Do a wakeup if necessary.
 */
void
audio_rint(void *v)
{
	struct audio_softc *sc = v;
	struct audio_hw_if *hw = sc->hw_if;
	struct audio_ringbuffer *cb = &sc->sc_rr;
	int blksize;
	int error;

	if (!sc->sc_open)
		return;		/* ignore interrupt if not open */

	blksize = cb->blksize;

	cb->inp += blksize;
	if (cb->inp >= cb->end)
		cb->inp = cb->start;
	cb->stamp += blksize;
	if (cb->mmapped) {
		DPRINTFN(2, ("audio_rint: mmapped inp=%p cc=%d\n",
			     cb->inp, blksize));
		if (!hw->trigger_input)
			(void)hw->start_input(sc->hw_hdl, cb->inp, blksize,
			    audio_rint, (void *)sc);
		return;
	}

#ifdef AUDIO_INTR_TIME
	{
		struct timeval tv;
		u_long t;
		microtime(&tv);
		t = tv.tv_usec + 1000000 * tv.tv_sec;
		if (sc->sc_rnintr) {
			long lastdelta, totdelta;
			lastdelta = t - sc->sc_rlastintr - sc->sc_rblktime;
			if (lastdelta > sc->sc_rblktime / 5) {
				printf("audio: record interrupt(%d) off "
				       "relative by %ld us (%lu)\n",
				       sc->sc_rnintr, lastdelta,
				       sc->sc_rblktime);
			}
			totdelta = t - sc->sc_rfirstintr -
				sc->sc_rblktime * sc->sc_rnintr;
			if (totdelta > sc->sc_rblktime / 2) {
				sc->sc_rnintr++;
				printf("audio: record interrupt(%d) off "
				       "absolute by %ld us (%lu)\n",
				       sc->sc_rnintr, totdelta,
				       sc->sc_rblktime);
				sc->sc_rnintr++; /* avoid repeated messages */
			}
		} else
			sc->sc_rfirstintr = t;
		sc->sc_rlastintr = t;
		sc->sc_rnintr++;
	}
#endif

	cb->used += blksize;
	if (cb->pause) {
		DPRINTFN(1, ("audio_rint: pdrops %lu\n", cb->pdrops));
		cb->pdrops += blksize;
		cb->outp += blksize;
		if (cb->outp >= cb->end)
			cb->outp = cb->start;
		cb->used -= blksize;
	} else if (cb->used + blksize >= cb->usedhigh && !cb->copying) {
		DPRINTFN(1, ("audio_rint: drops %lu\n", cb->drops));
		cb->drops += blksize;
		cb->outp += blksize;
		if (cb->outp >= cb->end)
			cb->outp = cb->start;
		cb->used -= blksize;
	}

	DPRINTFN(2, ("audio_rint: inp=%p cc=%d used=%d\n",
		     cb->inp, blksize, cb->used));
	if (!hw->trigger_input) {
		error = hw->start_input(sc->hw_hdl, cb->inp, blksize,
		    audio_rint, (void *)sc);
		if (error) {
			/* XXX does this really help? */
			DPRINTF(("audio_rint: restart failed: %d\n", error));
			audio_clear(sc);
		}
	}

	audio_wakeup(&sc->sc_rchan);
	selnotify(&sc->sc_rsel, 0);
	if (sc->sc_async_audio)
		psignal(sc->sc_async_audio, SIGIO);
}

int
audio_check_params(struct audio_params *p)
{
	if (p->encoding == AUDIO_ENCODING_PCM16) {
		if (p->precision == 8)
			p->encoding = AUDIO_ENCODING_ULINEAR;
		else
			p->encoding = AUDIO_ENCODING_SLINEAR;
	} else if (p->encoding == AUDIO_ENCODING_PCM8) {
		if (p->precision == 8)
			p->encoding = AUDIO_ENCODING_ULINEAR;
		else
			return EINVAL;
	}

	if (p->encoding == AUDIO_ENCODING_SLINEAR)
#if BYTE_ORDER == LITTLE_ENDIAN
		p->encoding = AUDIO_ENCODING_SLINEAR_LE;
#else
		p->encoding = AUDIO_ENCODING_SLINEAR_BE;
#endif
	if (p->encoding == AUDIO_ENCODING_ULINEAR)
#if BYTE_ORDER == LITTLE_ENDIAN
		p->encoding = AUDIO_ENCODING_ULINEAR_LE;
#else
		p->encoding = AUDIO_ENCODING_ULINEAR_BE;
#endif

	switch (p->encoding) {
	case AUDIO_ENCODING_ULAW:
	case AUDIO_ENCODING_ALAW:
		if (p->precision != 8)
			return (EINVAL);
		break;
	case AUDIO_ENCODING_ADPCM:
		if (p->precision != 4 && p->precision != 8)
			return (EINVAL);
		break;
	case AUDIO_ENCODING_SLINEAR_LE:
	case AUDIO_ENCODING_SLINEAR_BE:
	case AUDIO_ENCODING_ULINEAR_LE:
	case AUDIO_ENCODING_ULINEAR_BE:
		/* XXX is: our zero-fill can handle any multiple of 8 */
		if (p->precision !=  8 && p->precision != 16 &&
		    p->precision != 24 && p->precision != 32)
			return (EINVAL);
		break;
	case AUDIO_ENCODING_MPEG_L1_STREAM:
	case AUDIO_ENCODING_MPEG_L1_PACKETS:
	case AUDIO_ENCODING_MPEG_L1_SYSTEM:
	case AUDIO_ENCODING_MPEG_L2_STREAM:
	case AUDIO_ENCODING_MPEG_L2_PACKETS:
	case AUDIO_ENCODING_MPEG_L2_SYSTEM:
		break;
	default:
		return (EINVAL);
	}

	if (p->channels < 1 || p->channels > 8)	/* sanity check # of channels*/
		return (EINVAL);

	return (0);
}

int
audio_set_defaults(struct audio_softc *sc, u_int mode)
{
	struct audio_info ai;

	/* default parameters */
	sc->sc_rparams = audio_default;
	sc->sc_pparams = audio_default;
	sc->sc_blkset = 0;

	AUDIO_INITINFO(&ai);
	ai.record.sample_rate = sc->sc_rparams.sample_rate;
	ai.record.encoding    = sc->sc_rparams.encoding;
	ai.record.channels    = sc->sc_rparams.channels;
	ai.record.precision   = sc->sc_rparams.precision;
	ai.play.sample_rate   = sc->sc_pparams.sample_rate;
	ai.play.encoding      = sc->sc_pparams.encoding;
	ai.play.channels      = sc->sc_pparams.channels;
	ai.play.precision     = sc->sc_pparams.precision;
	ai.mode		      = mode;

	return (audiosetinfo(sc, &ai));
}

int
au_set_lr_value(struct	audio_softc *sc, mixer_ctrl_t *ct, int l, int r)
{
	ct->type = AUDIO_MIXER_VALUE;
	ct->un.value.num_channels = 2;
	ct->un.value.level[AUDIO_MIXER_LEVEL_LEFT] = l;
	ct->un.value.level[AUDIO_MIXER_LEVEL_RIGHT] = r;
	if (sc->hw_if->set_port(sc->hw_hdl, ct) == 0)
		return 0;
	ct->un.value.num_channels = 1;
	ct->un.value.level[AUDIO_MIXER_LEVEL_MONO] = (l+r)/2;
	return sc->hw_if->set_port(sc->hw_hdl, ct);
}

int
au_set_gain(struct audio_softc *sc, struct au_mixer_ports *ports,
	    int gain, int balance)
{
	mixer_ctrl_t ct;
	int i, error;
	int l, r;
	u_int mask;
	int nset;

	if (balance == AUDIO_MID_BALANCE) {
		l = r = gain;
	} else if (balance < AUDIO_MID_BALANCE) {
		l = gain;
		r = (balance * gain) / AUDIO_MID_BALANCE;
	} else {
		r = gain;
		l = ((AUDIO_RIGHT_BALANCE - balance) * gain)
		    / AUDIO_MID_BALANCE;
	}
	DPRINTF(("au_set_gain: gain=%d balance=%d, l=%d r=%d\n",
		 gain, balance, l, r));

	if (ports->index == -1) {
	usemaster:
		if (ports->master == -1)
			return 0; /* just ignore it silently */
		ct.dev = ports->master;
		error = au_set_lr_value(sc, &ct, l, r);
	} else {
		ct.dev = ports->index;
		if (ports->isenum) {
			ct.type = AUDIO_MIXER_ENUM;
			error = sc->hw_if->get_port(sc->hw_hdl, &ct);
			if (error)
				return error;
			if (ports->isdual) {
				if (ports->cur_port == -1)
					ct.dev = ports->master;
				else
					ct.dev = ports->miport[ports->cur_port];
				error = au_set_lr_value(sc, &ct, l, r);
			} else {
				for(i = 0; i < ports->nports; i++)
				    if (ports->misel[i] == ct.un.ord) {
					    ct.dev = ports->miport[i];
					    if (ct.dev == -1 ||
						au_set_lr_value(sc, &ct, l, r))
						    goto usemaster;
					    else
						    break;
				    }
			}
		} else {
			ct.type = AUDIO_MIXER_SET;
			error = sc->hw_if->get_port(sc->hw_hdl, &ct);
			if (error)
				return error;
			mask = ct.un.mask;
			nset = 0;
			for(i = 0; i < ports->nports; i++) {
				if (ports->misel[i] & mask) {
				    ct.dev = ports->miport[i];
				    if (ct.dev != -1 &&
					au_set_lr_value(sc, &ct, l, r) == 0)
					    nset++;
				}
			}
			if (nset == 0)
				goto usemaster;
		}
	}
	if (!error)
		mixer_signal(sc);
	return error;
}

int
au_get_lr_value(struct	audio_softc *sc, mixer_ctrl_t *ct, int *l, int *r)
{
	int error;

	ct->un.value.num_channels = 2;
	if (sc->hw_if->get_port(sc->hw_hdl, ct) == 0) {
		*l = ct->un.value.level[AUDIO_MIXER_LEVEL_LEFT];
		*r = ct->un.value.level[AUDIO_MIXER_LEVEL_RIGHT];
	} else {
		ct->un.value.num_channels = 1;
		error = sc->hw_if->get_port(sc->hw_hdl, ct);
		if (error)
			return error;
		*r = *l = ct->un.value.level[AUDIO_MIXER_LEVEL_MONO];
	}
	return 0;
}

void
au_get_gain(struct audio_softc *sc, struct au_mixer_ports *ports,
	    u_int *pgain, u_char *pbalance)
{
	mixer_ctrl_t ct;
	int i, l, r, n;
	int lgain = AUDIO_MAX_GAIN/2, rgain = AUDIO_MAX_GAIN/2;

	if (ports->index == -1) {
	usemaster:
		if (ports->master == -1)
			goto bad;
		ct.dev = ports->master;
		ct.type = AUDIO_MIXER_VALUE;
		if (au_get_lr_value(sc, &ct, &lgain, &rgain))
			goto bad;
	} else {
		ct.dev = ports->index;
		if (ports->isenum) {
			ct.type = AUDIO_MIXER_ENUM;
			if (sc->hw_if->get_port(sc->hw_hdl, &ct))
				goto bad;
			ct.type = AUDIO_MIXER_VALUE;
			if (ports->isdual) {
				if (ports->cur_port == -1)
					ct.dev = ports->master;
				else
					ct.dev = ports->miport[ports->cur_port];
				au_get_lr_value(sc, &ct, &lgain, &rgain);
			} else {
				for(i = 0; i < ports->nports; i++)
				    if (ports->misel[i] == ct.un.ord) {
					    ct.dev = ports->miport[i];
					    if (ct.dev == -1 ||
						au_get_lr_value(sc, &ct,
								&lgain, &rgain))
						    goto usemaster;
					    else
						    break;
				    }
			}
		} else {
			ct.type = AUDIO_MIXER_SET;
			if (sc->hw_if->get_port(sc->hw_hdl, &ct))
				goto bad;
			ct.type = AUDIO_MIXER_VALUE;
			lgain = rgain = n = 0;
			for(i = 0; i < ports->nports; i++) {
				if (ports->misel[i] & ct.un.mask) {
					ct.dev = ports->miport[i];
					if (ct.dev == -1 ||
					    au_get_lr_value(sc, &ct, &l, &r))
						goto usemaster;
					else {
						lgain += l;
						rgain += r;
						n++;
					}
				}
			}
			if (n != 0) {
				lgain /= n;
				rgain /= n;
			}
		}
	}
bad:
	if (lgain == rgain) {	/* handles lgain==rgain==0 */
		*pgain = lgain;
		*pbalance = AUDIO_MID_BALANCE;
	} else if (lgain < rgain) {
		*pgain = rgain;
		/* balance should be > AUDIO_MID_BALANCE */
		*pbalance = AUDIO_RIGHT_BALANCE -
			(AUDIO_MID_BALANCE * lgain) / rgain;
	} else /* lgain > rgain */ {
		*pgain = lgain;
		/* balance should be < AUDIO_MID_BALANCE */
		*pbalance = (AUDIO_MID_BALANCE * rgain) / lgain;
	}
}

int
au_set_port(struct audio_softc *sc, struct au_mixer_ports *ports, u_int port)
{
	mixer_ctrl_t ct;
	int i, error, use_mixerout;

	use_mixerout = 1;
	if (port == 0) {
		if (ports->allports == 0)
			return 0;		/* Allow this special case. */
		else if (ports->isdual) {
			if (ports->cur_port == -1) {
				return 0;
			} else {
				port = ports->aumask[ports->cur_port];
				ports->cur_port = -1;
				use_mixerout = 0;
			}
		}
	}
	if (ports->index == -1)
		return EINVAL;
	ct.dev = ports->index;
	if (ports->isenum) {
		if (port & (port-1))
			return EINVAL; /* Only one port allowed */
		ct.type = AUDIO_MIXER_ENUM;
		error = EINVAL;
		for(i = 0; i < ports->nports; i++)
			if (ports->aumask[i] == port) {
				if (ports->isdual && use_mixerout) {
					ct.un.ord = ports->mixerout;
					ports->cur_port = i;
				} else {
					ct.un.ord = ports->misel[i];
				}
				error = sc->hw_if->set_port(sc->hw_hdl, &ct);
				break;
			}
	} else {
		ct.type = AUDIO_MIXER_SET;
		ct.un.mask = 0;
		for(i = 0; i < ports->nports; i++)
			if (ports->aumask[i] & port)
				ct.un.mask |= ports->misel[i];
		if (port != 0 && ct.un.mask == 0)
			error = EINVAL;
		else
			error = sc->hw_if->set_port(sc->hw_hdl, &ct);
	}
	if (!error)
		mixer_signal(sc);
	return error;
}

int
au_get_port(struct audio_softc *sc, struct au_mixer_ports *ports)
{
	mixer_ctrl_t ct;
	int i, aumask;

	if (ports->index == -1)
		return 0;
	ct.dev = ports->index;
	ct.type = ports->isenum ? AUDIO_MIXER_ENUM : AUDIO_MIXER_SET;
	if (sc->hw_if->get_port(sc->hw_hdl, &ct))
		return 0;
	aumask = 0;
	if (ports->isenum) {
		if (ports->isdual && ports->cur_port != -1) {
			if (ports->mixerout == ct.un.ord)
				aumask = ports->aumask[ports->cur_port];
			else
				ports->cur_port = -1;
		}
		if (aumask == 0)
			for(i = 0; i < ports->nports; i++)
				if (ports->misel[i] == ct.un.ord)
					aumask = ports->aumask[i];
	} else {
		for(i = 0; i < ports->nports; i++)
			if (ct.un.mask & ports->misel[i])
				aumask |= ports->aumask[i];
	}
	return aumask;
}

#if NAURATECONV <= 0
/* dummy function for the case that aurateconv is not linked */
int
auconv_check_params(const struct audio_params *params)
{
	if (params->hw_channels == params->channels
	    && params->hw_sample_rate == params->sample_rate)
		return 0;	/* No conversion */
	return (EINVAL);
}
#endif /* !NAURATECONV */

int
audiosetinfo(struct audio_softc *sc, struct audio_info *ai)
{
	struct audio_prinfo *r = &ai->record, *p = &ai->play;
	int cleared;
	int s, setmode, modechange = 0;
	int error;
	struct audio_hw_if *hw = sc->hw_if;
	struct audio_params pp, rp;
	int np, nr;
	unsigned int blks;
	int oldpblksize, oldrblksize;
	int rbus, pbus;
	u_int gain;
	u_char balance;

	if (hw == 0)		/* HW has not attached */
		return(ENXIO);

	rbus = sc->sc_rbus;
	pbus = sc->sc_pbus;
	error = 0;
	cleared = 0;

	pp = sc->sc_pparams;	/* Temporary encoding storage in */
	rp = sc->sc_rparams;	/* case setting the modes fails. */
	nr = np = 0;

	if (p->sample_rate != ~0) {
		pp.sample_rate = p->sample_rate;
		np++;
	}
	if (r->sample_rate != ~0) {
		rp.sample_rate = r->sample_rate;
		nr++;
	}
	if (p->encoding != ~0) {
		pp.encoding = p->encoding;
		np++;
	}
	if (r->encoding != ~0) {
		rp.encoding = r->encoding;
		nr++;
	}
	if (p->precision != ~0) {
		pp.precision = p->precision;
		np++;
	}
	if (r->precision != ~0) {
		rp.precision = r->precision;
		nr++;
	}
	if (p->channels != ~0) {
		pp.channels = p->channels;
		np++;
	}
	if (r->channels != ~0) {
		rp.channels = r->channels;
		nr++;
	}
#ifdef AUDIO_DEBUG
	if (audiodebug && nr)
	    audio_print_params("Setting record params", &rp);
	if (audiodebug && np)
	    audio_print_params("Setting play params", &pp);
#endif
	if (nr && (error = audio_check_params(&rp)))
		return error;
	if (np && (error = audio_check_params(&pp)))
		return error;
	setmode = 0;
	if (nr) {
		if (!cleared) {
			audio_clear(sc);
			cleared = 1;
		}
		modechange = 1;
		rp.sw_code = 0;
		rp.factor = 1;
		rp.factor_denom = 1;
		rp.hw_sample_rate = rp.sample_rate;
		rp.hw_encoding = rp.encoding;
		rp.hw_precision = rp.precision;
		rp.hw_channels = rp.channels;
		setmode |= AUMODE_RECORD;
	}
	if (np) {
		if (!cleared) {
			audio_clear(sc);
			cleared = 1;
		}
		modechange = 1;
		pp.sw_code = 0;
		pp.factor = 1;
		pp.factor_denom = 1;
		pp.hw_sample_rate = pp.sample_rate;
		pp.hw_encoding = pp.encoding;
		pp.hw_precision = pp.precision;
		pp.hw_channels = pp.channels;
		setmode |= AUMODE_PLAY;
	}

	if (ai->mode != ~0) {
		if (!cleared) {
			audio_clear(sc);
			cleared = 1;
		}
		modechange = 1;
		sc->sc_mode = ai->mode;
		if (sc->sc_mode & AUMODE_PLAY_ALL)
			sc->sc_mode |= AUMODE_PLAY;
		if ((sc->sc_mode & AUMODE_PLAY) && !sc->sc_full_duplex)
			/* Play takes precedence */
			sc->sc_mode &= ~AUMODE_RECORD;
	}

	if (modechange) {
		int orig_p_channels, orig_p_rate;
		int orig_r_channels, orig_r_rate;
		int indep;

		indep = hw->get_props(sc->hw_hdl) & AUDIO_PROP_INDEPENDENT;
		if (!indep) {
			if (setmode == AUMODE_RECORD)
				pp = rp;
			else if (setmode == AUMODE_PLAY)
				rp = pp;
		}
		/* Some device drivers change channels/sample_rate and change
		 * no channels/sample_rate. */
		orig_p_channels = pp.channels;
		orig_p_rate = pp.sample_rate;
		orig_r_channels = rp.channels;
		orig_r_rate = rp.sample_rate;
		error = hw->set_params(sc->hw_hdl, setmode,
		    sc->sc_mode & (AUMODE_PLAY | AUMODE_RECORD), &pp, &rp);
		if (error)
			return (error);

		if (np) {
			if (orig_p_channels != pp.channels)
				pp.hw_channels = pp.channels;
			if (orig_p_rate != pp.sample_rate)
				pp.hw_sample_rate = pp.sample_rate;
			error = auconv_check_params(&pp);
			if (error)
				return (error);
		}
		if (nr) {
			if (orig_r_channels != rp.channels)
				rp.hw_channels = rp.channels;
			if (orig_r_rate != rp.sample_rate)
				rp.hw_sample_rate = rp.sample_rate;
			error = auconv_check_params(&rp);
			if (error)
				return (error);
		}

		if (!indep) {
			if (setmode == AUMODE_RECORD) {
				pp.sample_rate = rp.sample_rate;
				pp.encoding    = rp.encoding;
				pp.channels    = rp.channels;
				pp.precision   = rp.precision;
			} else if (setmode == AUMODE_PLAY) {
				rp.sample_rate = pp.sample_rate;
				rp.encoding    = pp.encoding;
				rp.channels    = pp.channels;
				rp.precision   = pp.precision;
			}
		}
		sc->sc_rparams = rp;
		sc->sc_pparams = pp;
	}

	oldpblksize = sc->sc_pr.blksize;
	oldrblksize = sc->sc_rr.blksize;
	/* Play params can affect the record params, so recalculate blksize. */
	if (nr || np) {
		audio_calc_blksize(sc, AUMODE_RECORD);
		audio_calc_blksize(sc, AUMODE_PLAY);
	}
#ifdef AUDIO_DEBUG
	if (audiodebug > 1 && nr)
	    audio_print_params("After setting record params", &sc->sc_rparams);
	if (audiodebug > 1 && np)
	    audio_print_params("After setting play params", &sc->sc_pparams);
#endif

	if (p->port != ~0) {
		if (!cleared) {
			audio_clear(sc);
			cleared = 1;
		}
		error = au_set_port(sc, &sc->sc_outports, p->port);
		if (error)
			return(error);
	}
	if (r->port != ~0) {
		if (!cleared) {
			audio_clear(sc);
			cleared = 1;
		}
		error = au_set_port(sc, &sc->sc_inports, r->port);
		if (error)
			return(error);
	}
	if (p->gain != ~0) {
		au_get_gain(sc, &sc->sc_outports, &gain, &balance);
		error = au_set_gain(sc, &sc->sc_outports, p->gain, balance);
		if (error)
			return(error);
	}
	if (r->gain != ~0) {
		au_get_gain(sc, &sc->sc_inports, &gain, &balance);
		error = au_set_gain(sc, &sc->sc_inports, r->gain, balance);
		if (error)
			return(error);
	}

	if (p->balance != (u_char)~0) {
		au_get_gain(sc, &sc->sc_outports, &gain, &balance);
		error = au_set_gain(sc, &sc->sc_outports, gain, p->balance);
		if (error)
			return(error);
	}
	if (r->balance != (u_char)~0) {
		au_get_gain(sc, &sc->sc_inports, &gain, &balance);
		error = au_set_gain(sc, &sc->sc_inports, gain, r->balance);
		if (error)
			return(error);
	}

	if (ai->monitor_gain != ~0 &&
	    sc->sc_monitor_port != -1) {
		mixer_ctrl_t ct;

		ct.dev = sc->sc_monitor_port;
		ct.type = AUDIO_MIXER_VALUE;
		ct.un.value.num_channels = 1;
		ct.un.value.level[AUDIO_MIXER_LEVEL_MONO] = ai->monitor_gain;
		error = sc->hw_if->set_port(sc->hw_hdl, &ct);
		if (error)
			return(error);
	}

	if (p->pause != (u_char)~0) {
		sc->sc_pr.pause = p->pause;
		if (!p->pause && !sc->sc_pbus && (sc->sc_mode & AUMODE_PLAY)) {
			s = splaudio();
			error = audiostartp(sc);
			splx(s);
			if (error)
				return error;
		}
	}
	if (r->pause != (u_char)~0) {
		sc->sc_rr.pause = r->pause;
		if (!r->pause && !sc->sc_rbus &&
		    (sc->sc_mode & AUMODE_RECORD)) {
			s = splaudio();
			error = audiostartr(sc);
			splx(s);
			if (error)
				return error;
		}
	}

	if (ai->blocksize != ~0) {
		/* Block size specified explicitly. */
		if (!cleared) {
			audio_clear(sc);
			cleared = 1;
		}
		if (ai->blocksize == 0) {
			sc->sc_blkset = 0;
			audio_calc_blksize(sc, AUMODE_RECORD);
			audio_calc_blksize(sc, AUMODE_PLAY);
		} else {
			sc->sc_blkset = 1;
			sc->sc_pr.blksize = sc->sc_rr.blksize = ai->blocksize;
		}
	}

	if (ai->mode != ~0) {
		if (sc->sc_mode & AUMODE_PLAY)
			audio_init_play(sc);
		if (sc->sc_mode & AUMODE_RECORD)
			audio_init_record(sc);
	}

	if (hw->commit_settings) {
		error = hw->commit_settings(sc->hw_hdl);
		if (error)
			return (error);
	}

	if (cleared) {
		s = splaudio();
		error = audio_initbufs(sc);
		if (error) goto err;
		if (sc->sc_pr.blksize != oldpblksize ||
		    sc->sc_rr.blksize != oldrblksize)
			audio_calcwater(sc);
		if ((sc->sc_mode & AUMODE_PLAY) &&
		    pbus && !sc->sc_pbus)
			error = audiostartp(sc);
		if (!error &&
		    (sc->sc_mode & AUMODE_RECORD) &&
		    rbus && !sc->sc_rbus)
			error = audiostartr(sc);
	err:
		splx(s);
		if (error)
			return error;
	}

	/* Change water marks after initializing the buffers. */
	if (ai->hiwat != ~0) {
		blks = ai->hiwat;
		if (blks > sc->sc_pr.maxblks)
			blks = sc->sc_pr.maxblks;
		if (blks < 2)
			blks = 2;
		sc->sc_pr.usedhigh = blks * sc->sc_pr.blksize;
	}
	if (ai->lowat != ~0) {
		blks = ai->lowat;
		if (blks > sc->sc_pr.maxblks - 1)
			blks = sc->sc_pr.maxblks - 1;
		sc->sc_pr.usedlow = blks * sc->sc_pr.blksize;
	}
	if (ai->hiwat != ~0 || ai->lowat != ~0) {
		if (sc->sc_pr.usedlow > sc->sc_pr.usedhigh - sc->sc_pr.blksize)
			sc->sc_pr.usedlow =
				sc->sc_pr.usedhigh - sc->sc_pr.blksize;
	}

	return (0);
}

int
audiogetinfo(struct audio_softc *sc, struct audio_info *ai)
{
	struct audio_prinfo *r = &ai->record, *p = &ai->play;
	struct audio_hw_if *hw = sc->hw_if;

	if (hw == 0)		/* HW has not attached */
		return(ENXIO);

	p->sample_rate = sc->sc_pparams.sample_rate;
	r->sample_rate = sc->sc_rparams.sample_rate;
	p->channels = sc->sc_pparams.channels;
	r->channels = sc->sc_rparams.channels;
	p->precision = sc->sc_pparams.precision;
	r->precision = sc->sc_rparams.precision;
	p->encoding = sc->sc_pparams.encoding;
	r->encoding = sc->sc_rparams.encoding;

	r->port = au_get_port(sc, &sc->sc_inports);
	p->port = au_get_port(sc, &sc->sc_outports);

	r->avail_ports = sc->sc_inports.allports;
	p->avail_ports = sc->sc_outports.allports;

	au_get_gain(sc, &sc->sc_inports,  &r->gain, &r->balance);
	au_get_gain(sc, &sc->sc_outports, &p->gain, &p->balance);

	if (sc->sc_monitor_port != -1) {
		mixer_ctrl_t ct;

		ct.dev = sc->sc_monitor_port;
		ct.type = AUDIO_MIXER_VALUE;
		ct.un.value.num_channels = 1;
		if (sc->hw_if->get_port(sc->hw_hdl, &ct))
			ai->monitor_gain = 0;
		else
			ai->monitor_gain =
				ct.un.value.level[AUDIO_MIXER_LEVEL_MONO];
	} else
		ai->monitor_gain = 0;

	p->seek = sc->sc_pr.used;
	r->seek = sc->sc_rr.used;

	p->samples = sc->sc_pr.stamp - sc->sc_pr.drops;
	r->samples = sc->sc_rr.stamp - sc->sc_rr.drops;

	p->eof = sc->sc_eof;
	r->eof = 0;

	p->pause = sc->sc_pr.pause;
	r->pause = sc->sc_rr.pause;

	p->error = sc->sc_pr.drops != 0;
	r->error = sc->sc_rr.drops != 0;

	p->waiting = r->waiting = 0;		/* open never hangs */

	p->open = (sc->sc_open & AUOPEN_WRITE) != 0;
	r->open = (sc->sc_open & AUOPEN_READ) != 0;

	p->active = sc->sc_pbus;
	r->active = sc->sc_rbus;

	p->buffer_size = sc->sc_pr.bufsize;
	r->buffer_size = sc->sc_rr.bufsize;

	ai->blocksize = sc->sc_pr.blksize;
	ai->hiwat = sc->sc_pr.usedhigh / sc->sc_pr.blksize;
	ai->lowat = sc->sc_pr.usedlow / sc->sc_pr.blksize;
	ai->mode = sc->sc_mode;

	return (0);
}

/*
 * Mixer driver
 */
int
mixer_open(dev_t dev, struct audio_softc *sc, int flags, int ifmt,
	   struct proc *p)
{
	if (!sc->hw_if)
		return (ENXIO);

	DPRINTF(("mixer_open: flags=0x%x sc=%p\n", flags, sc));

	return (0);
}

/*
 * Remove a process from those to be signalled on mixer activity.
 */
static void
mixer_remove(struct audio_softc *sc, struct proc *p)
{
	struct mixer_asyncs **pm, *m;

	for(pm = &sc->sc_async_mixer; *pm; pm = &(*pm)->next) {
		if ((*pm)->proc == p) {
			m = *pm;
			*pm = m->next;
			free(m, M_DEVBUF);
			return;
		}
	}
}

/*
 * Signal all processes waiting for the mixer.
 */
static void
mixer_signal(struct audio_softc *sc)
{
	struct mixer_asyncs *m;

	for(m = sc->sc_async_mixer; m; m = m->next)
		psignal(m->proc, SIGIO);
}

/*
 * Close a mixer device
 */
/* ARGSUSED */
int
mixer_close(struct audio_softc *sc, int flags, int ifmt, struct proc *p)
{
	DPRINTF(("mixer_close: sc %p\n", sc));

	mixer_remove(sc, p);

	return (0);
}

int
mixer_ioctl(struct audio_softc *sc, u_long cmd, caddr_t addr, int flag,
	    struct proc *p)
{
	struct audio_hw_if *hw = sc->hw_if;
	int error = EINVAL;

	DPRINTF(("mixer_ioctl(%lu,'%c',%lu)\n",
		 IOCPARM_LEN(cmd), (char)IOCGROUP(cmd), cmd&0xff));

	switch (cmd) {
	case FIOASYNC:
		mixer_remove(sc, p); /* remove old entry */
		if (*(int *)addr) {
			struct mixer_asyncs *ma;
			ma = malloc(sizeof (struct mixer_asyncs),
				    M_DEVBUF, M_WAITOK);
			ma->next = sc->sc_async_mixer;
			ma->proc = p;
			sc->sc_async_mixer = ma;
		}
		error = 0;
		break;

	case AUDIO_GETDEV:
		DPRINTF(("AUDIO_GETDEV\n"));
		error = hw->getdev(sc->hw_hdl, (audio_device_t *)addr);
		break;

	case AUDIO_MIXER_DEVINFO:
		DPRINTF(("AUDIO_MIXER_DEVINFO\n"));
		((mixer_devinfo_t *)addr)->un.v.delta = 0; /* default */
		error = hw->query_devinfo(sc->hw_hdl, (mixer_devinfo_t *)addr);
		break;

	case AUDIO_MIXER_READ:
		DPRINTF(("AUDIO_MIXER_READ\n"));
		error = hw->get_port(sc->hw_hdl, (mixer_ctrl_t *)addr);
		break;

	case AUDIO_MIXER_WRITE:
		DPRINTF(("AUDIO_MIXER_WRITE\n"));
		error = hw->set_port(sc->hw_hdl, (mixer_ctrl_t *)addr);
		if (!error && hw->commit_settings)
			error = hw->commit_settings(sc->hw_hdl);
		if (!error)
			mixer_signal(sc);
		break;

	default:
		if (hw->dev_ioctl)
			error = hw->dev_ioctl(sc->hw_hdl, cmd, addr, flag, p);
		else
			error = EINVAL;
		break;
	}
	DPRINTF(("mixer_ioctl(%lu,'%c',%lu) result %d\n",
		 IOCPARM_LEN(cmd), (char)IOCGROUP(cmd), cmd&0xff, error));
	return (error);
}
#endif /* NAUDIO > 0 */

#include "midi.h"

#if NAUDIO == 0 && (NMIDI > 0 || NMIDIBUS > 0)
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/audioio.h>
#include <dev/audio_if.h>
#endif

#if NAUDIO > 0 || (NMIDI > 0 || NMIDIBUS > 0)
int
audioprint(void *aux, const char *pnp)
{
	struct audio_attach_args *arg = aux;
	const char *type;

	if (pnp != NULL) {
		switch (arg->type) {
		case AUDIODEV_TYPE_AUDIO:
			type = "audio";
			break;
		case AUDIODEV_TYPE_MIDI:
			type = "midi";
			break;
		case AUDIODEV_TYPE_OPL:
			type = "opl";
			break;
		case AUDIODEV_TYPE_MPU:
			type = "mpu";
			break;
		default:
			panic("audioprint: unknown type %d", arg->type);
		}
		aprint_normal("%s at %s", type, pnp);
	}
	return (UNCONF);
}

#endif /* NAUDIO > 0 || (NMIDI > 0 || NMIDIBUS > 0) */