5a354a1ed4
Mixers with the "global" flag set aren't closed automatically when the output device is closed. Thus, they might still be open when MPD shuts down.
190 lines
3.5 KiB
C
190 lines
3.5 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "mixer_control.h"
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#include "mixer_api.h"
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#include <glib.h>
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#include <assert.h>
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#include <stddef.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "mixer"
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static bool mixers_enabled = true;
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void
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mixer_disable_all(void)
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{
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g_debug("mixer api is disabled");
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mixers_enabled = false;
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}
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struct mixer *
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mixer_new(const struct mixer_plugin *plugin, const struct config_param *param)
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{
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struct mixer *mixer;
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//mixers are disabled (by using software volume)
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if (!mixers_enabled) {
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return NULL;
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}
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assert(plugin != NULL);
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mixer = plugin->init(param);
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assert(mixer == NULL || mixer->plugin == plugin);
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return mixer;
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}
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void
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mixer_free(struct mixer *mixer)
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{
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assert(mixer != NULL);
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assert(mixer->plugin != NULL);
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assert(mixer->mutex != NULL);
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/* mixers with the "global" flag set might still be open at
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this point (see mixer_auto_close()) */
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mixer_close(mixer);
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g_mutex_free(mixer->mutex);
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mixer->plugin->finish(mixer);
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}
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bool
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mixer_open(struct mixer *mixer)
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{
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bool success;
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assert(mixer != NULL);
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assert(mixer->plugin != NULL);
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g_mutex_lock(mixer->mutex);
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if (mixer->open)
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success = true;
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else
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success = mixer->open = mixer->plugin->open(mixer);
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mixer->failed = !success;
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g_mutex_unlock(mixer->mutex);
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return success;
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}
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static void
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mixer_close_internal(struct mixer *mixer)
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{
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assert(mixer != NULL);
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assert(mixer->plugin != NULL);
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assert(mixer->open);
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mixer->plugin->close(mixer);
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mixer->open = false;
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}
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void
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mixer_close(struct mixer *mixer)
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{
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assert(mixer != NULL);
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assert(mixer->plugin != NULL);
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g_mutex_lock(mixer->mutex);
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if (mixer->open)
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mixer_close_internal(mixer);
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g_mutex_unlock(mixer->mutex);
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}
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void
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mixer_auto_close(struct mixer *mixer)
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{
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if (!mixer->plugin->global)
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mixer_close(mixer);
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}
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/*
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* Close the mixer due to failure. The mutex must be locked before
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* calling this function.
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*/
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static void
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mixer_failed(struct mixer *mixer)
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{
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assert(mixer->open);
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mixer_close_internal(mixer);
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mixer->failed = true;
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}
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int
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mixer_get_volume(struct mixer *mixer)
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{
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int volume;
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assert(mixer != NULL);
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if (mixer->plugin->global && !mixer->failed && !mixer_open(mixer))
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return -1;
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g_mutex_lock(mixer->mutex);
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if (mixer->open) {
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volume = mixer->plugin->get_volume(mixer);
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if (volume < 0)
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mixer_failed(mixer);
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} else
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volume = -1;
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g_mutex_unlock(mixer->mutex);
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return volume;
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}
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bool
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mixer_set_volume(struct mixer *mixer, unsigned volume)
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{
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bool success;
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assert(mixer != NULL);
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assert(volume <= 100);
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if (mixer->plugin->global && !mixer->failed && !mixer_open(mixer))
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return false;
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g_mutex_lock(mixer->mutex);
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if (mixer->open) {
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success = mixer->plugin->set_volume(mixer, volume);
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if (!success)
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mixer_failed(mixer);
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} else
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success = false;
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g_mutex_unlock(mixer->mutex);
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return success;
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}
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