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/*
* Copyright (C) 2003-2009 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 "../output_api.h"
#include "../mixer_api.h"
#include <glib.h>
#include <alsa/asoundlib.h>
#define VOLUME_MIXER_ALSA_DEFAULT "default"
#define VOLUME_MIXER_ALSA_CONTROL_DEFAULT "PCM"
struct alsa_mixer {
/** the base mixer class */
struct mixer base;
char *device;
char *control;
snd_mixer_t *handle;
snd_mixer_elem_t *elem;
long volume_min;
long volume_max;
int volume_set;
};
static struct mixer *
alsa_mixer_init(const struct config_param *param)
{
struct alsa_mixer *am = g_new(struct alsa_mixer, 1);
mixer_init(&am->base, &alsa_mixer);
am->device = config_dup_block_string(param, "mixer_device", NULL);
am->control = config_dup_block_string(param, "mixer_control", NULL);
am->handle = NULL;
am->elem = NULL;
am->volume_min = 0;
am->volume_max = 0;
am->volume_set = -1;
return &am->base;
}
static void
alsa_mixer_finish(struct mixer *data)
{
struct alsa_mixer *am = (struct alsa_mixer *)data;
g_free(am->device);
g_free(am->control);
g_free(am);
}
static void
alsa_mixer_close(struct mixer *data)
{
struct alsa_mixer *am = (struct alsa_mixer *)data;
if (am->handle) snd_mixer_close(am->handle);
am->handle = NULL;
}
static bool
alsa_mixer_open(struct mixer *data)
{
struct alsa_mixer *am = (struct alsa_mixer *)data;
int err;
snd_mixer_elem_t *elem;
const char *control_name = VOLUME_MIXER_ALSA_CONTROL_DEFAULT;
const char *device = VOLUME_MIXER_ALSA_DEFAULT;
if (am->device) {
device = am->device;
}
err = snd_mixer_open(&am->handle, 0);
snd_config_update_free_global();
if (err < 0) {
g_warning("problems opening alsa mixer: %s\n", snd_strerror(err));
return false;
}
if ((err = snd_mixer_attach(am->handle, device)) < 0) {
g_warning("problems attaching alsa mixer: %s\n",
snd_strerror(err));
alsa_mixer_close(data);
return false;
}
if ((err = snd_mixer_selem_register(am->handle, NULL,
NULL)) < 0) {
g_warning("problems snd_mixer_selem_register'ing: %s\n",
snd_strerror(err));
alsa_mixer_close(data);
return false;
}
if ((err = snd_mixer_load(am->handle)) < 0) {
g_warning("problems snd_mixer_selem_register'ing: %s\n",
snd_strerror(err));
alsa_mixer_close(data);
return false;
}
elem = snd_mixer_first_elem(am->handle);
if (am->control) {
control_name = am->control;
}
while (elem) {
if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) {
if (strcasecmp(control_name,
snd_mixer_selem_get_name(elem)) == 0) {
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;
}
g_warning("can't find alsa mixer control \"%s\"\n", control_name);
alsa_mixer_close(data);
return false;
}
static int
alsa_mixer_get_volume(struct mixer *mixer)
{
struct alsa_mixer *am = (struct alsa_mixer *)mixer;
int err;
int ret;
long level;
if (am->handle == NULL && !alsa_mixer_open(mixer))
return -1;
err = snd_mixer_handle_events(am->handle);
if (err < 0) {
g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n",
snd_strerror(err), "handle_events");
alsa_mixer_close(mixer);
return false;
}
err = snd_mixer_selem_get_playback_volume(am->elem,
SND_MIXER_SCHN_FRONT_LEFT,
&level);
if (err < 0) {
g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n",
snd_strerror(err), "selem_get_playback_volume");
alsa_mixer_close(mixer);
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)
{
struct alsa_mixer *am = (struct alsa_mixer *)mixer;
float vol;
long level;
int err;
if (am->handle == NULL && !alsa_mixer_open(mixer))
return false;
vol = volume;
am->volume_set = vol + 0.5;
am->volume_set = am->volume_set > 100
? 100 :
(am->volume_set < 0
? 0 : am->volume_set);
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_warning("problems setting alsa volume: %s\n",
snd_strerror(err));
alsa_mixer_close(mixer);
return false;
}
return true;
}
const struct mixer_plugin alsa_mixer = {
.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,
};
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