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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 "MixerControl.hxx"
#include "MixerInternal.hxx"
#include "util/Error.hxx"
#include <assert.h>
#include <stddef.h>
Mixer *
mixer_new(const struct mixer_plugin *plugin, void *ao,
const config_param ¶m,
Error &error)
{
Mixer *mixer;
assert(plugin != nullptr);
mixer = plugin->init(ao, param, error);
assert(mixer == nullptr || mixer->IsPlugin(*plugin));
return mixer;
}
void
mixer_free(Mixer *mixer)
{
assert(mixer != nullptr);
assert(mixer->plugin != nullptr);
/* mixers with the "global" flag set might still be open at
this point (see mixer_auto_close()) */
mixer_close(mixer);
mixer->plugin->finish(mixer);
}
bool
mixer_open(Mixer *mixer, Error &error)
{
bool success;
assert(mixer != nullptr);
assert(mixer->plugin != nullptr);
const ScopeLock protect(mixer->mutex);
if (mixer->open)
success = true;
else if (mixer->plugin->open == nullptr)
success = mixer->open = true;
else
success = mixer->open = mixer->plugin->open(mixer, error);
mixer->failed = !success;
return success;
}
static void
mixer_close_internal(Mixer *mixer)
{
assert(mixer != nullptr);
assert(mixer->plugin != nullptr);
assert(mixer->open);
if (mixer->plugin->close != nullptr)
mixer->plugin->close(mixer);
mixer->open = false;
}
void
mixer_close(Mixer *mixer)
{
assert(mixer != nullptr);
assert(mixer->plugin != nullptr);
const ScopeLock protect(mixer->mutex);
if (mixer->open)
mixer_close_internal(mixer);
}
void
mixer_auto_close(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(Mixer *mixer)
{
assert(mixer->open);
mixer_close_internal(mixer);
mixer->failed = true;
}
int
mixer_get_volume(Mixer *mixer, Error &error)
{
int volume;
assert(mixer != nullptr);
if (mixer->plugin->global && !mixer->failed &&
!mixer_open(mixer, error))
return -1;
const ScopeLock protect(mixer->mutex);
if (mixer->open) {
volume = mixer->plugin->get_volume(mixer, error);
if (volume < 0 && error.IsDefined())
mixer_failed(mixer);
} else
volume = -1;
return volume;
}
bool
mixer_set_volume(Mixer *mixer, unsigned volume, Error &error)
{
assert(mixer != nullptr);
assert(volume <= 100);
if (mixer->plugin->global && !mixer->failed &&
!mixer_open(mixer, error))
return false;
const ScopeLock protect(mixer->mutex);
return mixer->open &&
mixer->plugin->set_volume(mixer, volume, error);
}
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