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/*-
* Copyright (c) 2015-2019 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 <poll.h>
#include "backend.h"
#include "int.h"
static int
oss_set_format(int fd, int *format)
{
int value[6];
int error;
int fmt;
int i;
value[0] = *format & VPREFERRED_SNE_AFMT;
value[1] = *format & VPREFERRED_UNE_AFMT;
value[2] = *format & VPREFERRED_SLE_AFMT;
value[3] = *format & VPREFERRED_SBE_AFMT;
value[4] = *format & VPREFERRED_ULE_AFMT;
value[5] = *format & VPREFERRED_UBE_AFMT;
for (i = 0; i != 6; i++) {
fmt = value[i];
if (fmt == 0)
continue;
error = ioctl(fd, SNDCTL_DSP_SETFMT, &fmt);
/* make sure we got the format we asked for */
if (error == 0 && fmt == value[i]) {
*format = fmt;
return (0);
}
}
return (-1);
}
static void
oss_close(struct voss_backend *pbe)
{
if (pbe->fd > -1) {
close(pbe->fd);
pbe->fd = -1;
}
}
static int
oss_open(struct voss_backend *pbe, const char *devname, int samplerate,
int bufsize, int *pchannels, int *pformat, int attr, int fionbio)
{
int temp;
int err;
pbe->fd = open(devname, attr);
if (pbe->fd < 0) {
warn("Could not open DSP device '%s'", devname);
return (-1);
}
err = ioctl(pbe->fd, FIONBIO, &fionbio);
if (err < 0) {
warn("Could not set blocking mode on DSP");
goto error;
}
err = oss_set_format(pbe->fd, pformat);
if (err < 0) {
warn("Could not set sample format 0x%08x", *pformat);
goto error;
}
temp = *pchannels;
bufsize /= temp; /* get buffer size per channel */
do {
err = ioctl(pbe->fd, SOUND_PCM_WRITE_CHANNELS, &temp);
} while (err < 0 && --temp > 0);
err = ioctl(pbe->fd, SOUND_PCM_READ_CHANNELS, &temp);
if (err < 0 || temp <= 0 || temp > *pchannels) {
warn("Could not set DSP channels: %d / %d", temp, *pchannels);
goto error;
}
*pchannels = temp;
temp = samplerate;
err = ioctl(pbe->fd, SNDCTL_DSP_SPEED, &temp);
if (err < 0 || temp != samplerate) {
warn("Could not set sample rate to %d / %d Hz", temp, samplerate);
goto error;
}
temp = bufsize * (*pchannels);
err = ioctl(pbe->fd, SNDCTL_DSP_SETBLKSIZE, &temp);
if (err < 0) {
warn("Could not set block size to %d", temp);
goto error;
}
return (0);
error:
close(pbe->fd);
pbe->fd = -1;
return (-1);
}
static int
oss_rec_open(struct voss_backend *pbe, const char *devname, int samplerate,
int bufsize, int *pchannels, int *pformat)
{
return (oss_open(pbe, devname, samplerate, bufsize, pchannels, pformat, O_RDONLY, 0));
}
static int
oss_play_open(struct voss_backend *pbe, const char *devname, int samplerate,
int bufsize, int *pchannels, int *pformat)
{
bufsize *= 4; /* XXX allow extra space for jitter */
return (oss_open(pbe, devname, samplerate, bufsize, pchannels, pformat, O_WRONLY, 0));
}
static int
oss_rec_transfer(struct voss_backend *pbe, void *ptr, int len)
{
struct pollfd fds = { .fd = pbe->fd, .events = POLLIN | POLLRDNORM };
int err;
/* wait at maximum 2 seconds for data, else something is wrong */
err = poll(&fds, 1, 2000);
if (err < 1)
return (-1);
return (read(pbe->fd, ptr, len));
}
static int
oss_play_transfer(struct voss_backend *pbe, void *ptr, int len)
{
return (write(pbe->fd, ptr, len));
}
static void
oss_rec_delay(struct voss_backend *pbe, int *pdelay)
{
if (ioctl(pbe->fd, FIONREAD, pdelay) != 0)
*pdelay = -1;
}
static void
oss_play_delay(struct voss_backend *pbe, int *pdelay)
{
if (voss_has_synchronization != 0 ||
ioctl(pbe->fd, SNDCTL_DSP_GETODELAY, pdelay) != 0)
*pdelay = -1;
}
struct voss_backend voss_backend_oss_rec = {
.open = oss_rec_open,
.close = oss_close,
.transfer = oss_rec_transfer,
.delay = oss_rec_delay,
.fd = -1,
};
struct voss_backend voss_backend_oss_play = {
.open = oss_play_open,
.close = oss_close,
.transfer = oss_play_transfer,
.delay = oss_play_delay,
.fd = -1,
};
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