62b03cfddf
This commit is similar to 788e3b31e1,
and removes more "pure" attributes which were placed on functions that
could throw exceptions, which is illegal according to clang's
understanding of the attribute (but not according to GCC's). GitHub
issue #58 was most likely about StorageDirectoryReader::GetInfo() and
Storage::GetInfo(), which still had "pure" attributes.
Closes #58
100 lines
2.2 KiB
C++
100 lines
2.2 KiB
C++
/*
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* Copyright 2003-2017 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 "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;
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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;
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public:
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explicit Mixer(const MixerPlugin &_plugin, MixerListener &_listener)
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:plugin(_plugin), listener(_listener),
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open(false),
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failed(false) {}
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Mixer(const Mixer &) = delete;
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virtual ~Mixer() {}
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bool IsPlugin(const MixerPlugin &other) const {
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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() = 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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