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/*
* Copyright (C) 2003-2010 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 <glib.h>
#include <alsa/asoundlib.h>
#define VOLUME_MIXER_ALSA_DEFAULT "default"
#define VOLUME_MIXER_ALSA_CONTROL_DEFAULT "PCM"
#define VOLUME_MIXER_ALSA_INDEX_DEFAULT 0
struct alsa_mixer {
/** the base mixer class */
struct mixer base;
const char *device;
const char *control;
unsigned int index;
snd_mixer_t *handle;
snd_mixer_elem_t *elem;
long volume_min;
long volume_max;
int volume_set;
};
/**
* The quark used for GError.domain.
*/
static inline GQuark
alsa_mixer_quark(void)
{
return g_quark_from_static_string("alsa_mixer");
}
static struct mixer *
alsa_mixer_init(G_GNUC_UNUSED void *ao, const struct config_param *param,
G_GNUC_UNUSED GError **error_r)
{
struct alsa_mixer *am = g_new(struct alsa_mixer, 1);
mixer_init(&am->base, &alsa_mixer_plugin);
am->device = config_get_block_string(param, "mixer_device",
VOLUME_MIXER_ALSA_DEFAULT);
am->control = config_get_block_string(param, "mixer_control",
VOLUME_MIXER_ALSA_CONTROL_DEFAULT);
am->index = config_get_block_unsigned(param, "mixer_index",
VOLUME_MIXER_ALSA_INDEX_DEFAULT);
return &am->base;
}
static void
alsa_mixer_finish(struct mixer *data)
{
struct alsa_mixer *am = (struct alsa_mixer *)data;
g_free(am);
/* free libasound's config cache */
snd_config_update_free_global();
}
static void
alsa_mixer_close(struct mixer *data)
{
struct alsa_mixer *am = (struct alsa_mixer *)data;
assert(am->handle != NULL);
snd_mixer_close(am->handle);
}
static bool
alsa_mixer_open(struct mixer *data, GError **error_r)
{
struct alsa_mixer *am = (struct alsa_mixer *)data;
int err;
snd_mixer_elem_t *elem;
am->volume_set = -1;
err = snd_mixer_open(&am->handle, 0);
if (err < 0) {
g_set_error(error_r, alsa_mixer_quark(), err,
"snd_mixer_open() failed: %s", snd_strerror(err));
return false;
}
if ((err = snd_mixer_attach(am->handle, am->device)) < 0) {
alsa_mixer_close(data);
g_set_error(error_r, alsa_mixer_quark(), err,
"failed to attach to %s: %s",
am->device, snd_strerror(err));
return false;
}
if ((err = snd_mixer_selem_register(am->handle, NULL,
NULL)) < 0) {
alsa_mixer_close(data);
g_set_error(error_r, alsa_mixer_quark(), err,
"snd_mixer_selem_register() failed: %s",
snd_strerror(err));
return false;
}
if ((err = snd_mixer_load(am->handle)) < 0) {
alsa_mixer_close(data);
g_set_error(error_r, alsa_mixer_quark(), err,
"snd_mixer_load() failed: %s\n",
snd_strerror(err));
return false;
}
elem = snd_mixer_first_elem(am->handle);
while (elem) {
if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) {
if ((g_ascii_strcasecmp(am->control,
snd_mixer_selem_get_name(elem)) == 0) &&
(am->index == snd_mixer_selem_get_index(elem))) {
break;
}
}
elem = snd_mixer_elem_next(elem);
}
if (elem) {
am->elem = elem;
snd_mixer_selem_get_playback_volume_range(am->elem,
&am->volume_min,
&am->volume_max);
return true;
}
alsa_mixer_close(data);
g_set_error(error_r, alsa_mixer_quark(), 0,
"no such mixer control: %s", am->control);
return false;
}
static int
alsa_mixer_get_volume(struct mixer *mixer, GError **error_r)
{
struct alsa_mixer *am = (struct alsa_mixer *)mixer;
int err;
int ret;
long level;
assert(am->handle != NULL);
err = snd_mixer_handle_events(am->handle);
if (err < 0) {
g_set_error(error_r, alsa_mixer_quark(), err,
"snd_mixer_handle_events() failed: %s",
snd_strerror(err));
return false;
}
err = snd_mixer_selem_get_playback_volume(am->elem,
SND_MIXER_SCHN_FRONT_LEFT,
&level);
if (err < 0) {
g_set_error(error_r, alsa_mixer_quark(), err,
"failed to read ALSA volume: %s",
snd_strerror(err));
return false;
}
ret = ((am->volume_set / 100.0) * (am->volume_max - am->volume_min)
+ am->volume_min) + 0.5;
if (am->volume_set > 0 && ret == level) {
ret = am->volume_set;
} else {
ret = (int)(100 * (((float)(level - am->volume_min)) /
(am->volume_max - am->volume_min)) + 0.5);
}
return ret;
}
static bool
alsa_mixer_set_volume(struct mixer *mixer, unsigned volume, GError **error_r)
{
struct alsa_mixer *am = (struct alsa_mixer *)mixer;
float vol;
long level;
int err;
assert(am->handle != NULL);
vol = volume;
am->volume_set = vol + 0.5;
level = (long)(((vol / 100.0) * (am->volume_max - am->volume_min) +
am->volume_min) + 0.5);
level = level > am->volume_max ? am->volume_max : level;
level = level < am->volume_min ? am->volume_min : level;
err = snd_mixer_selem_set_playback_volume_all(am->elem, level);
if (err < 0) {
g_set_error(error_r, alsa_mixer_quark(), err,
"failed to set ALSA volume: %s",
snd_strerror(err));
return false;
}
return true;
}
const struct mixer_plugin alsa_mixer_plugin = {
.init = alsa_mixer_init,
.finish = alsa_mixer_finish,
.open = alsa_mixer_open,
.close = alsa_mixer_close,
.get_volume = alsa_mixer_get_volume,
.set_volume = alsa_mixer_set_volume,
.global = true,
};
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