/* OSS Output.
*
* Copyright (C) 2016 Reece H. Dunn
*
* This file is part of pcaudiolib.
*
* pcaudiolib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* pcaudiolib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with pcaudiolib. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "audio_priv.h"
#if defined(HAVE_SYS_SOUNDCARD_H)
#include <sys/soundcard.h>
#define DEFAULT_OSS_DEVICE "/dev/dsp"
#elif defined(HAVE_LINUX_SOUNDCARD_H)
#include <linux/soundcard.h>
#define DEFAULT_OSS_DEVICE "/dev/dsp"
#elif defined(HAVE_SOUNDCARD_H)
#include <soundcard.h>
#define DEFAULT_OSS_DEVICE "/dev/dsp"
#endif
#ifdef DEFAULT_OSS_DEVICE
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>
struct oss_object
{
struct audio_object vtable;
int fd;
char *device;
};
#define to_oss_object(object) container_of(object, struct oss_object, vtable)
int
oss_object_open(struct audio_object *object,
enum audio_object_format format,
uint32_t rate,
uint8_t channels)
{
struct oss_object *self = to_oss_object(object);
if (self->fd != -1)
return EEXIST;
int oss_format;
switch (format)
{
case AUDIO_OBJECT_FORMAT_ALAW: oss_format = AFMT_A_LAW; break;
case AUDIO_OBJECT_FORMAT_ULAW: oss_format = AFMT_MU_LAW; break;
case AUDIO_OBJECT_FORMAT_S8: oss_format = AFMT_S8; break;
case AUDIO_OBJECT_FORMAT_U8: oss_format = AFMT_U8; break;
case AUDIO_OBJECT_FORMAT_S16LE: oss_format = AFMT_S16_LE; break;
case AUDIO_OBJECT_FORMAT_S16BE: oss_format = AFMT_S16_BE; break;
case AUDIO_OBJECT_FORMAT_U16LE: oss_format = AFMT_U16_LE; break;
case AUDIO_OBJECT_FORMAT_U16BE: oss_format = AFMT_U16_BE; break;
case AUDIO_OBJECT_FORMAT_ADPCM: oss_format = AFMT_IMA_ADPCM; break;
case AUDIO_OBJECT_FORMAT_MPEG: oss_format = AFMT_MPEG; break;
#if defined AFMT_AC3
case AUDIO_OBJECT_FORMAT_AC3: oss_format = AFMT_AC3; break;
#endif
default: return EINVAL;
}
int data;
if ((self->fd = open(self->device ? self->device : DEFAULT_OSS_DEVICE, O_RDWR, 0)) == -1)
return errno;
if (ioctl(self->fd, SNDCTL_DSP_SETFMT, &oss_format) == -1)
goto error;
data = rate;
if (ioctl(self->fd, SNDCTL_DSP_SPEED, &data) == -1)
goto error;
data = channels;
if (ioctl(self->fd, SNDCTL_DSP_CHANNELS, &data) == -1)
goto error;
return 0;
error:
data = errno;
close(self->fd);
self->fd = -1;
return data;
}
void
oss_object_close(struct audio_object *object)
{
struct oss_object *self = to_oss_object(object);
if (self->fd == -1) {
close(self->fd);
self->fd = -1;
}
}
void
oss_object_destroy(struct audio_object *object)
{
struct oss_object *self = to_oss_object(object);
free(self->device);
free(self);
}
int
oss_object_drain(struct audio_object *object)
{
struct oss_object *self = to_oss_object(object);
if (ioctl(self->fd, SNDCTL_DSP_SYNC, NULL) == -1)
return errno;
return 0;
}
int
oss_object_flush(struct audio_object *object)
{
struct oss_object *self = to_oss_object(object);
if (ioctl(self->fd, SNDCTL_DSP_RESET, NULL) == -1)
return errno;
return 0;
}
int
oss_object_write(struct audio_object *object,
const void *data,
size_t bytes)
{
struct oss_object *self = to_oss_object(object);
if (write(self->fd, data, bytes) == -1)
return errno;
return 0;
}
const char *
oss_object_strerror(struct audio_object *object,
int error)
{
return strerror(error);
}
struct audio_object *
create_oss_object(const char *device,
const char *application_name,
const char *description)
{
struct oss_object *self = malloc(sizeof(struct oss_object));
if (!self)
return NULL;
self->fd = -1;
self->device = device ? strdup(device) : NULL;
self->vtable.open = oss_object_open;
self->vtable.close = oss_object_close;
self->vtable.destroy = oss_object_destroy;
self->vtable.write = oss_object_write;
self->vtable.drain = oss_object_drain;
self->vtable.flush = oss_object_flush;
self->vtable.strerror = oss_object_strerror;
return &self->vtable;
}
#else
struct audio_object *
create_oss_object(const char *device,
const char *application_name,
const char *description)
{
return NULL;
}
#endif