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When resuming from suspend, prime play buffers with silence,
otherwise the client would underrun by more than its own buffer
size, which currently is not allowed (causes the client to
deadlock).

Set the minimum client buffer size to two blocks. Single block
buffers don't work properly yet.

with help from jakemsr

/*	$OpenBSD: safile.c,v 1.21 2010/01/11 13:06:32 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 <sys/time.h>
#include <sys/types.h>

#include <poll.h>
#include <sndio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "aparams.h"
#include "aproc.h"
#include "conf.h"
#include "dev.h"
#include "file.h"
#include "safile.h"
#ifdef DEBUG
#include "dbg.h"
#endif

struct safile {
	struct file file;
	struct sio_hdl *hdl;
	int started;
};

void safile_close(struct file *);
unsigned safile_read(struct file *, unsigned char *, unsigned);
unsigned safile_write(struct file *, unsigned char *, unsigned);
void safile_start(struct file *);
void safile_stop(struct file *);
int safile_nfds(struct file *);
int safile_pollfd(struct file *, struct pollfd *, int);
int safile_revents(struct file *, struct pollfd *);

struct fileops safile_ops = {
	"sio",
	sizeof(struct safile),
	safile_close,
	safile_read,
	safile_write,
	safile_start,
	safile_stop,
	safile_nfds,
	safile_pollfd,
	safile_revents
};

void
safile_cb(void *addr, int delta)
{
	struct safile *f = (struct safile *)addr;
	struct aproc *p;

	if (delta != 0) {
		p = f->file.wproc;
		if (p && p->ops->opos)
			p->ops->opos(p, NULL, delta);
	}
	if (delta != 0) {
		p = f->file.rproc;
		if (p && p->ops->ipos)
			p->ops->ipos(p, NULL, delta);
	}
}

/*
 * Open the device.
 */
struct safile *
safile_new(struct fileops *ops, char *path,
    struct aparams *ipar, struct aparams *opar,
    unsigned *bufsz, unsigned *round)
{
	struct sio_par par;
	struct sio_hdl *hdl;
	struct safile *f;
	int mode;

	mode = 0;
	if (ipar)
		mode |= SIO_REC;
	if (opar)
		mode |= SIO_PLAY;
	hdl = sio_open(path, mode, 1);
	if (hdl == NULL)
		return NULL;
	sio_initpar(&par);
	if (ipar) {
		par.bits = ipar->bits;
		par.bps = ipar->bps;
		par.sig = ipar->sig;
		par.le = ipar->le;
		par.msb = ipar->msb;
		par.rate = ipar->rate;
		par.rchan = ipar->cmax - ipar->cmin + 1;
	} else {
		par.bits = opar->bits;
		par.bps = opar->bps;
		par.sig = opar->sig;
		par.le = opar->le;
		par.msb = opar->msb;
		par.rate = opar->rate;
	}
	if (opar)
		par.pchan = opar->cmax - opar->cmin + 1;
	par.appbufsz = *bufsz;
	par.round = *round;
	if (!sio_setpar(hdl, &par))
		goto bad_close;
	if (!sio_getpar(hdl, &par))
		goto bad_close;
	if (ipar) {
		ipar->bits = par.bits;
		ipar->bps = par.bps;
		ipar->sig = par.sig;
		ipar->le = par.le;
		ipar->msb = par.msb;
		ipar->rate = par.rate;
		ipar->cmax = ipar->cmin + par.rchan - 1;
	}
	if (opar) {
		opar->bits = par.bits;
		opar->bps = par.bps;
		opar->sig = par.sig;
		opar->le = par.le;
		opar->msb = par.msb;
		opar->rate = par.rate;
		opar->cmax = opar->cmin + par.pchan - 1;
	}
	*bufsz = par.bufsz;
	*round = par.round;
	if (path == NULL)
		path = "default";
	f = (struct safile *)file_new(ops, path, sio_nfds(hdl));
	if (f == NULL)
		goto bad_close;
	f->hdl = hdl;
	f->started = 0;
	sio_onmove(f->hdl, safile_cb, f);
	return f;
 bad_close:
	sio_close(hdl);
	return NULL;
}

void
safile_start(struct file *file)
{
	struct safile *f = (struct safile *)file;

	if (!sio_start(f->hdl)) {
#ifdef DEBUG
		dbg_puts(f->file.name);
		dbg_puts(": failed to start device\n");
#endif
		file_close(file);
		return;
	}
	f->started = 1;
#ifdef DEBUG
	if (debug_level >= 3) {
		file_dbg(&f->file);
		dbg_puts(": started\n");
	}
#endif
}

void
safile_stop(struct file *file)
{
	struct safile *f = (struct safile *)file;

	f->started = 0;
	if (!sio_eof(f->hdl) && !sio_stop(f->hdl)) {
#ifdef DEBUG
		dbg_puts(f->file.name);
		dbg_puts(": failed to stop device\n");
#endif
		file_close(file);
		return;
	}
#ifdef DEBUG
	if (debug_level >= 3) {
		file_dbg(&f->file);
		dbg_puts(": stopped\n");
	}
#endif
}

unsigned
safile_read(struct file *file, unsigned char *data, unsigned count)
{
	struct safile *f = (struct safile *)file;
	unsigned n;

	n = f->started ? sio_read(f->hdl, data, count) : 0;
	if (n == 0) {
		f->file.state &= ~FILE_ROK;
		if (sio_eof(f->hdl)) {
#ifdef DEBUG
			dbg_puts(f->file.name);
			dbg_puts(": failed to read from device\n");
#endif
			file_eof(&f->file);
		} else {
#ifdef DEBUG
			if (debug_level >= 4) {
				file_dbg(&f->file);
				dbg_puts(": reading blocked\n");
			}
#endif
		}
		return 0;
	}
	return n;

}

unsigned
safile_write(struct file *file, unsigned char *data, unsigned count)
{
	struct safile *f = (struct safile *)file;
	unsigned n;

	n = f->started ? sio_write(f->hdl, data, count) : 0;
	if (n == 0) {
		f->file.state &= ~FILE_WOK;
		if (sio_eof(f->hdl)) {
#ifdef DEBUG
			dbg_puts(f->file.name);
			dbg_puts(": failed to write on device\n");
#endif
			file_hup(&f->file);
		} else {
#ifdef DEBUG
			if (debug_level >= 4) {
				file_dbg(&f->file);
				dbg_puts(": writing blocked\n");
			}
#endif
		}
		return 0;
	}
	return n;
}

int
safile_nfds(struct file *file)
{
	return sio_nfds(((struct safile *)file)->hdl);
}

int
safile_pollfd(struct file *file, struct pollfd *pfd, int events)
{
	struct safile *f = (struct safile *)file;

	if (!f->started)
		events &= ~(POLLIN | POLLOUT);
	return sio_pollfd(((struct safile *)file)->hdl, pfd, events);
}

int
safile_revents(struct file *file, struct pollfd *pfd)
{
	return sio_revents(((struct safile *)file)->hdl, pfd);
}

void
safile_close(struct file *file)
{
	struct safile *f = (struct safile *)file;

	if (f->started)
		safile_stop(&f->file);
	return sio_close(((struct safile *)file)->hdl);
}