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/* SPDX-License-Identifier: GPL-2.0 */
/** \file oss_mix.c The OSS mixer plugin. */
#include <sys/soundcard.h>
#include <sys/ioctl.h>
#include "para.h"
#include "error.h"
#include "mix.h"
#include "fd.h"
#include "string.h"
struct oss_mixer_channel {
const char *name;
int id;
};
static const struct oss_mixer_channel channels[] = {
{.name = "volume", .id = SOUND_MIXER_VOLUME},
{.name = "bass", .id = SOUND_MIXER_BASS},
{.name = "treble", .id = SOUND_MIXER_TREBLE},
{.name = "synth", .id = SOUND_MIXER_SYNTH},
{.name = "pcm", .id = SOUND_MIXER_PCM},
{.name = "speaker", .id = SOUND_MIXER_SPEAKER},
{.name = "line", .id = SOUND_MIXER_LINE},
{.name = "mic", .id = SOUND_MIXER_MIC},
{.name = "cd", .id = SOUND_MIXER_CD},
{.name = "imix", .id = SOUND_MIXER_IMIX},
{.name = "altpcm", .id = SOUND_MIXER_ALTPCM},
{.name = "reclev", .id = SOUND_MIXER_RECLEV},
{.name = "igain", .id = SOUND_MIXER_IGAIN},
{.name = "ogain", .id = SOUND_MIXER_OGAIN},
};
/** Iterate over all defined mixer channels. */
#define FOR_EACH_CHANNEL(i) for ((i) = 0; (i) < ARRAY_SIZE(channels); (i)++)
struct mixer_handle {
int fd;
int id;
};
static int oss_mix_open(const char *dev, struct mixer_handle **handle)
{
int ret;
struct mixer_handle *h;
*handle = NULL;
if (!dev)
dev = "/dev/mixer";
PARA_INFO_LOG("opening %s\n", dev);
ret = para_open(dev, O_RDWR, 42);
if (ret < 0) {
PARA_ERROR_LOG("could not open %s\n", dev);
return ret;
}
h = alloc(sizeof(*h));
h->fd = ret;
*handle = h;
return 1;
}
static char *oss_mix_get_channels(__a_unused struct mixer_handle *handle)
{
int i;
char *list = NULL;
FOR_EACH_CHANNEL(i) {
const char *name = channels[i].name;
char *tmp = list;
list = make_message("%s%s%s",
list? list : "",
list? ", " : "",
name);
free(tmp);
}
return list;
}
static int oss_mix_set_channel(struct mixer_handle *handle,
const char *mixer_channel)
{
int i;
if (!mixer_channel) {
handle->id = SOUND_MIXER_VOLUME; /* default */
return 0;
}
FOR_EACH_CHANNEL(i) {
if (strcasecmp(channels[i].name, mixer_channel))
continue;
handle->id = i;
return 1;
}
return -E_BAD_CHANNEL;
}
static int oss_mix_get(const struct mixer_handle *handle)
{
int val, fd = handle->fd, id = handle->id;
if (ioctl(fd, MIXER_READ(id), &val) < 0)
return -ERRNO_TO_PARA_ERROR(errno);
/* take the mean value of left and right */
return (val % 256 + (val >> 8)) / 2;
}
static int oss_mix_set(struct mixer_handle *handle, int val)
{
int fd = handle->fd, id = handle->id, tmp = (val << 8) + val;
if (ioctl(fd, MIXER_WRITE(id), &tmp) < 0)
return -ERRNO_TO_PARA_ERROR(errno);
return 1;
}
static void oss_mix_close(struct mixer_handle *h)
{
if (h && h->fd >= 0)
close(h->fd);
free(h);
}
/** The mixer operations for the OSS mixer. */
const struct mixer oss_mixer = {
.name = "oss",
.open = oss_mix_open,
.get_channels = oss_mix_get_channels,
.set_channel = oss_mix_set_channel,
.close = oss_mix_close,
.get = oss_mix_get,
.set = oss_mix_set
};
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