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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "mixer_api.h"
#include "output_api.h"
#include "fd_util.h"
#include <glib.h>
#include <assert.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#if defined(__OpenBSD__) || defined(__NetBSD__)
# include <soundcard.h>
#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
# include <sys/soundcard.h>
#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
#define VOLUME_MIXER_OSS_DEFAULT "/dev/mixer"
struct oss_mixer {
/** the base mixer class */
struct mixer base;
const char *device;
const char *control;
int device_fd;
int volume_control;
};
/**
* The quark used for GError.domain.
*/
static inline GQuark
oss_mixer_quark(void)
{
return g_quark_from_static_string("oss_mixer");
}
static int
oss_find_mixer(const char *name)
{
const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
size_t name_length = strlen(name);
for (unsigned i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if (g_ascii_strncasecmp(name, labels[i], name_length) == 0 &&
(labels[i][name_length] == 0 ||
labels[i][name_length] == ' '))
return i;
}
return -1;
}
static struct mixer *
oss_mixer_init(G_GNUC_UNUSED void *ao, const struct config_param *param,
GError **error_r)
{
struct oss_mixer *om = g_new(struct oss_mixer, 1);
mixer_init(&om->base, &oss_mixer_plugin);
om->device = config_get_block_string(param, "mixer_device",
VOLUME_MIXER_OSS_DEFAULT);
om->control = config_get_block_string(param, "mixer_control", NULL);
if (om->control != NULL) {
om->volume_control = oss_find_mixer(om->control);
if (om->volume_control < 0) {
g_free(om);
g_set_error(error_r, oss_mixer_quark(), 0,
"no such mixer control: %s", om->control);
return NULL;
}
} else
om->volume_control = SOUND_MIXER_PCM;
return &om->base;
}
static void
oss_mixer_finish(struct mixer *data)
{
struct oss_mixer *om = (struct oss_mixer *) data;
g_free(om);
}
static void
oss_mixer_close(struct mixer *data)
{
struct oss_mixer *om = (struct oss_mixer *) data;
assert(om->device_fd >= 0);
close(om->device_fd);
}
static bool
oss_mixer_open(struct mixer *data, GError **error_r)
{
struct oss_mixer *om = (struct oss_mixer *) data;
om->device_fd = open_cloexec(om->device, O_RDONLY, 0);
if (om->device_fd < 0) {
g_set_error(error_r, oss_mixer_quark(), errno,
"failed to open %s: %s",
om->device, g_strerror(errno));
return false;
}
if (om->control) {
int devmask = 0;
if (ioctl(om->device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
g_set_error(error_r, oss_mixer_quark(), errno,
"READ_DEVMASK failed: %s",
g_strerror(errno));
oss_mixer_close(data);
return false;
}
if (((1 << om->volume_control) & devmask) == 0) {
g_set_error(error_r, oss_mixer_quark(), 0,
"mixer control \"%s\" not usable",
om->control);
oss_mixer_close(data);
return false;
}
}
return true;
}
static int
oss_mixer_get_volume(struct mixer *mixer, GError **error_r)
{
struct oss_mixer *om = (struct oss_mixer *)mixer;
int left, right, level;
int ret;
assert(om->device_fd >= 0);
ret = ioctl(om->device_fd, MIXER_READ(om->volume_control), &level);
if (ret < 0) {
g_set_error(error_r, oss_mixer_quark(), errno,
"failed to read OSS volume: %s",
g_strerror(errno));
return false;
}
left = level & 0xff;
right = (level & 0xff00) >> 8;
if (left != right) {
g_warning("volume for left and right is not the same, \"%i\" and "
"\"%i\"\n", left, right);
}
return left;
}
static bool
oss_mixer_set_volume(struct mixer *mixer, unsigned volume, GError **error_r)
{
struct oss_mixer *om = (struct oss_mixer *)mixer;
int level;
int ret;
assert(om->device_fd >= 0);
assert(volume <= 100);
level = (volume << 8) + volume;
ret = ioctl(om->device_fd, MIXER_WRITE(om->volume_control), &level);
if (ret < 0) {
g_set_error(error_r, oss_mixer_quark(), errno,
"failed to set OSS volume: %s",
g_strerror(errno));
return false;
}
return true;
}
const struct mixer_plugin oss_mixer_plugin = {
oss_mixer_init,
oss_mixer_finish,
oss_mixer_open,
oss_mixer_close,
oss_mixer_get_volume,
oss_mixer_set_volume,
true,
};
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