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+/*
+ * Copyright (C) 2003-2014 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.
+ */
+
+#ifndef MPD_MIXER_INTERNAL_HXX
+#define MPD_MIXER_INTERNAL_HXX
+
+#include "MixerPlugin.hxx"
+#include "MixerList.hxx"
+#include "thread/Mutex.hxx"
+#include "Compiler.h"
+
+class MixerListener;
+
+class Mixer {
+public:
+ const MixerPlugin &plugin;
+
+ MixerListener &listener;
+
+ /**
+ * This mutex protects all of the mixer struct, including its
+ * implementation, so plugins don't have to deal with that.
+ */
+ Mutex mutex;
+
+ /**
+ * Is the mixer device currently open?
+ */
+ bool open;
+
+ /**
+ * Has this mixer failed, and should not be reopened
+ * automatically?
+ */
+ bool failed;
+
+public:
+ explicit Mixer(const MixerPlugin &_plugin, MixerListener &_listener)
+ :plugin(_plugin), listener(_listener),
+ open(false),
+ failed(false) {}
+
+ Mixer(const Mixer &) = delete;
+
+ virtual ~Mixer() {}
+
+ bool IsPlugin(const MixerPlugin &other) const {
+ return &plugin == &other;
+ }
+
+ /**
+ * Open mixer device
+ *
+ * @return true on success, false on error
+ */
+ virtual bool Open(Error &error) = 0;
+
+ /**
+ * Close mixer device
+ */
+ virtual void Close() = 0;
+
+ /**
+ * Reads the current volume.
+ *
+ * @return the current volume (0..100 including) or -1 if
+ * unavailable or on error (error set, mixer will be closed)
+ */
+ gcc_pure
+ virtual int GetVolume(Error &error) = 0;
+
+ /**
+ * Sets the volume.
+ *
+ * @param volume the new volume (0..100 including) @return
+ * true on success, false on error
+ */
+ virtual bool SetVolume(unsigned volume, Error &error) = 0;
+};
+
+#endif