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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 "mixer_control.h"
#include "mixer_api.h"
#include <glib.h>
#include <assert.h>
#include <stddef.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "mixer"
static bool mixers_enabled = true;
void
mixer_disable_all(void)
{
g_debug("mixer api is disabled");
mixers_enabled = false;
}
struct mixer *
mixer_new(const struct mixer_plugin *plugin, const struct config_param *param)
{
struct mixer *mixer;
//mixers are disabled (by using software volume)
if (!mixers_enabled) {
return NULL;
}
assert(plugin != NULL);
mixer = plugin->init(param);
assert(mixer == NULL || mixer->plugin == plugin);
return mixer;
}
void
mixer_free(struct mixer *mixer)
{
assert(mixer != NULL);
assert(mixer->plugin != NULL);
assert(mixer->mutex != NULL);
/* mixers with the "global" flag set might still be open at
this point (see mixer_auto_close()) */
mixer_close(mixer);
g_mutex_free(mixer->mutex);
mixer->plugin->finish(mixer);
}
bool
mixer_open(struct mixer *mixer)
{
bool success;
assert(mixer != NULL);
assert(mixer->plugin != NULL);
g_mutex_lock(mixer->mutex);
if (mixer->open)
success = true;
else
success = mixer->open = mixer->plugin->open(mixer);
mixer->failed = !success;
g_mutex_unlock(mixer->mutex);
return success;
}
static void
mixer_close_internal(struct mixer *mixer)
{
assert(mixer != NULL);
assert(mixer->plugin != NULL);
assert(mixer->open);
mixer->plugin->close(mixer);
mixer->open = false;
}
void
mixer_close(struct mixer *mixer)
{
assert(mixer != NULL);
assert(mixer->plugin != NULL);
g_mutex_lock(mixer->mutex);
if (mixer->open)
mixer_close_internal(mixer);
g_mutex_unlock(mixer->mutex);
}
void
mixer_auto_close(struct mixer *mixer)
{
if (!mixer->plugin->global)
mixer_close(mixer);
}
/*
* Close the mixer due to failure. The mutex must be locked before
* calling this function.
*/
static void
mixer_failed(struct mixer *mixer)
{
assert(mixer->open);
mixer_close_internal(mixer);
mixer->failed = true;
}
int
mixer_get_volume(struct mixer *mixer)
{
int volume;
assert(mixer != NULL);
if (mixer->plugin->global && !mixer->failed && !mixer_open(mixer))
return -1;
g_mutex_lock(mixer->mutex);
if (mixer->open) {
volume = mixer->plugin->get_volume(mixer);
if (volume < 0)
mixer_failed(mixer);
} else
volume = -1;
g_mutex_unlock(mixer->mutex);
return volume;
}
bool
mixer_set_volume(struct mixer *mixer, unsigned volume)
{
bool success;
assert(mixer != NULL);
assert(volume <= 100);
if (mixer->plugin->global && !mixer->failed && !mixer_open(mixer))
return false;
g_mutex_lock(mixer->mutex);
if (mixer->open) {
success = mixer->plugin->set_volume(mixer, volume);
if (!success)
mixer_failed(mixer);
} else
success = false;
g_mutex_unlock(mixer->mutex);
return success;
}
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