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if aucat is resumed (after suspend), kernel buffers are empty, thus write()
syscall succedes and consumes aucat buffers until kernel buffers are full.
If aucat buffers are smaller than kernel ones, they will underrun, and aucat
will terminate, since underruns are not handled yet.

This changes is an improvement until SIGCONT handler is implemented. The
correct approach is to add a handler for SIGCONT to: call dev_stop(), reset
all buffers, bring play and record in sync, fill play buffers and call
dev_start().

ok jakemsr

/*	$OpenBSD: dev_sun.c,v 1.2 2008/05/28 07:36:23 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.
 */

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "conf.h"
#include "aparams.h"
#include "dev.h"

/*
 * convert sun device parameters to struct params
 */
int
sun_infotopar(struct audio_prinfo *ai, struct aparams *par)
{
	par->rate = ai->sample_rate;
	par->bps = ai->precision / 8;
	par->bits = ai->precision;
	par->cmax = par->cmin + ai->channels - 1;
	if (par->cmax >= CHAN_MAX) {
		warnx("%u:%u: channel range out of bounds",
		    par->cmin, par->cmax);
		return 0;
	}
	par->msb = 1;
	switch (ai->encoding) {
	case AUDIO_ENCODING_SLINEAR_LE:
		par->le = 1;
		par->sig = 1;
		break;
	case AUDIO_ENCODING_SLINEAR_BE:
		par->le = 0;
		par->sig = 1;
		break;
	case AUDIO_ENCODING_ULINEAR_LE:
		par->le = 1;
		par->sig = 0;
		break;
	case AUDIO_ENCODING_ULINEAR_BE:
		par->le = 0;
		par->sig = 0;
		break;
	case AUDIO_ENCODING_SLINEAR:
		par->le = NATIVE_LE;
		par->sig = 1;
		break;
	case AUDIO_ENCODING_ULINEAR:
		par->le = NATIVE_LE;
		par->sig = 0;
		break;
	default:
		warnx("only linear encodings are supported for audio devices");
		return 0;
	}
	return 1;
}

/*
 * Convert struct params to sun device parameters.
 */
void
sun_partoinfo(struct audio_prinfo *ai, struct aparams *par)
{
	ai->sample_rate = par->rate;
	ai->precision = par->bps * 8;
	ai->channels = par->cmax - par->cmin + 1;
	if (par->le && par->sig) {
		ai->encoding = AUDIO_ENCODING_SLINEAR_LE;
	} else if (!par->le && par->sig) {
		ai->encoding = AUDIO_ENCODING_SLINEAR_BE;
	} else if (par->le && !par->sig) {
		ai->encoding = AUDIO_ENCODING_ULINEAR_LE;
	} else {
		ai->encoding = AUDIO_ENCODING_ULINEAR_BE;
	}
}

/*
 * Open the device and pause it, so later play and record
 * can be started simultaneously.
 *
 * int "infr" and "onfd" we return the input and the output
 * block sizes respectively.
 */
int
dev_init(char *path, struct aparams *ipar, struct aparams *opar,
	 unsigned *infr, unsigned *onfr)
{
	int fd;
	int fullduplex;
	struct audio_info aui;	
	struct audio_bufinfo aubi;

	if (!ipar && !opar)
		errx(1, "%s: must at least play or record", path);

	fd = open(path, O_RDWR | O_NONBLOCK);
	if (fd < 0) {
		warn("%s", path);
		return -1;
	}

	/*
	 * If both play and record are requested then
	 * set full duplex mode.
	 */
	if (ipar && opar) {
		fullduplex = 1;
		if (ioctl(fd, AUDIO_SETFD, &fullduplex) < 0) {
			warn("%s: can't set full-duplex", path);
			close(fd);
			return -1;
		}
	}
	
	/*
	 * Set parameters and pause the device. When paused, the write(2)
	 * syscall will queue samples but the the kernel will not start playing
	 * them. Setting the 'mode' and pausing the device must be done in a
	 * single ioctl() call, otherwise the sun driver will start the device
	 * and fill the record buffers.
	 */
	AUDIO_INITINFO(&aui);
	aui.mode = 0;
	if (opar) {
		sun_partoinfo(&aui.play, opar);
		aui.play.pause = 1;
		aui.mode |= AUMODE_PLAY;
	}
	if (ipar) {
		sun_partoinfo(&aui.record, ipar);
		aui.record.pause = 1;
		aui.mode |= AUMODE_RECORD;
	}
	if (ioctl(fd, AUDIO_SETINFO, &aui) < 0) {
		fprintf(stderr, "%s: can't set audio params to ", path);
		if (ipar)
			aparams_print(ipar);
		if (opar) {
			if (ipar)
				fprintf(stderr, " and ");
			aparams_print(opar);
		}
		fprintf(stderr, ": %s\n", strerror(errno));
		close(fd);
		return -1;
	}
	if (ioctl(fd, AUDIO_GETINFO, &aui) < 0) {
		warn("dev_init: getinfo");
		close(fd);
		return -1;
	}
	if (opar) {
		if (!sun_infotopar(&aui.play, opar)) {
			close(fd);
			return -1;
		}
		if (ioctl(fd, AUDIO_GETPRINFO, &aubi) < 0) {
			warn("%s: AUDIO_GETPRINFO", path);
			close(fd);
			return -1;
		}
		*onfr = aubi.blksize * aubi.hiwat /
		    (aui.play.channels * aui.play.precision / 8);
	}
	if (ipar) {
		if (!sun_infotopar(&aui.record, ipar)) {
			close(fd);
			return -1;
		}
		if (ioctl(fd, AUDIO_GETRRINFO, &aubi) < 0) {
			warn("%s: AUDIO_GETRRINFO", path);
			close(fd);
			return -1;
		}
		*infr = aubi.blksize * aubi.hiwat /
		    (aui.record.channels * aui.record.precision / 8);
	}
	return fd;
}

void
dev_done(int fd)
{
	close(fd);
}

/*
 * Start play/record.
 */
void
dev_start(int fd)
{
	audio_info_t aui;

	/*
	 * Just unpause the device. The kernel will start playback and record
	 * simultaneously. There must be samples already written.
	 */
	AUDIO_INITINFO(&aui);	
	aui.play.pause = aui.record.pause = 0;
	if (ioctl(fd, AUDIO_SETINFO, &aui) < 0)
		err(1, "dev_start: setinfo");

	DPRINTF("dev_start: play/rec started\n");
}

/*
 * Stop play/record and clear kernel buffers so that dev_start() can be called
 * again.
 */
void
dev_stop(int fd)
{
	audio_info_t aui;
	unsigned mode;

	if (ioctl(fd, AUDIO_DRAIN) < 0)
		err(1, "dev_stop: drain");

	/*
	 * The only way to clear kernel buffers and to pause the device
	 * simultaneously is to set the mode again (to the same value).
	 */
	if (ioctl(fd, AUDIO_GETINFO, &aui) < 0)
		err(1, "dev_stop: getinfo");

	mode = aui.mode;
	AUDIO_INITINFO(&aui);
	aui.mode = mode;
	aui.play.pause = aui.record.pause = 1;	
	if (ioctl(fd, AUDIO_SETINFO, &aui) < 0)
		err(1, "dev_stop: setinfo");

	DPRINTF("dev_stop: play/rec stopped\n");
}