99 lines
2.2 KiB
C++
99 lines
2.2 KiB
C++
/*
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* Copyright 2003-2019 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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#ifndef MPD_MIXER_INTERNAL_HXX
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#define MPD_MIXER_INTERNAL_HXX
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#include "MixerPlugin.hxx"
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#include "MixerList.hxx"
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#include "thread/Mutex.hxx"
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#include "util/Compiler.h"
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class MixerListener;
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class Mixer {
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public:
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const MixerPlugin &plugin;
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MixerListener &listener;
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/**
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* This mutex protects all of the mixer struct, including its
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* implementation, so plugins don't have to deal with that.
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*/
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Mutex mutex;
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/**
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* Is the mixer device currently open?
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*/
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bool open = false;
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/**
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* Has this mixer failed, and should not be reopened
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* automatically?
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*/
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bool failed = false;
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public:
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explicit Mixer(const MixerPlugin &_plugin,
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MixerListener &_listener) noexcept
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:plugin(_plugin), listener(_listener) {}
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Mixer(const Mixer &) = delete;
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virtual ~Mixer() {}
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bool IsPlugin(const MixerPlugin &other) const noexcept {
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return &plugin == &other;
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}
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/**
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* Open mixer device
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*
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* Throws std::runtime_error on error.
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*/
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virtual void Open() = 0;
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/**
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* Close mixer device
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*/
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virtual void Close() noexcept = 0;
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/**
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* Reads the current volume.
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*
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* Throws std::runtime_error on error.
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*
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* @return the current volume (0..100 including) or -1 if
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* unavailable
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*/
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virtual int GetVolume() = 0;
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/**
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* Sets the volume.
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*
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* Throws std::runtime_error on error.
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*
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* @param volume the new volume (0..100 including)
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*/
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virtual void SetVolume(unsigned volume) = 0;
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};
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#endif
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