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/*-
* Copyright (c) 2015-2022 Hans Petter Selasky
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/queue.h>
#include <sys/filio.h>
#include <sys/soundcard.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <err.h>
#include <time.h>
#include "backend.h"
#include "int.h"
static void
null_close(struct voss_backend *pbe __unused)
{
}
static int
null_open(struct voss_backend *pbe __unused, const char *devname __unused,
int samplerate __unused, int bufsize __unused, int *pchannels __unused,
int *pformat)
{
int value[3];
int i;
value[0] = *pformat & VPREFERRED_SNE_AFMT;
value[1] = *pformat & VPREFERRED_SLE_AFMT;
value[2] = *pformat & VPREFERRED_SBE_AFMT;
for (i = 0; i != 3; i++) {
if (value[i] == 0)
continue;
*pformat = value[i];
return (0);
}
return (-1);
}
static int
null_rec_transfer(struct voss_backend *pbe __unused, void *ptr, int len)
{
if (voss_has_synchronization == 0)
virtual_oss_wait();
memset(ptr, 0, len);
return (len);
}
static int
null_play_transfer(struct voss_backend *pbe __unused, void *ptr __unused,
int len)
{
return (len);
}
static void
null_delay(struct voss_backend *pbe __unused, int *pdelay)
{
*pdelay = -1;
}
struct voss_backend voss_backend_null_rec = {
.open = null_open,
.close = null_close,
.transfer = null_rec_transfer,
.delay = null_delay,
};
struct voss_backend voss_backend_null_play = {
.open = null_open,
.close = null_close,
.transfer = null_play_transfer,
.delay = null_delay,
};
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