108 lines
1.8 KiB
C++
108 lines
1.8 KiB
C++
/*
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* Copyright 2003-2022 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.hxx"
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#include <cassert>
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void
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Mixer::LockOpen()
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{
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const std::scoped_lock lock{mutex};
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if (open)
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return;
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_Open();
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}
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void
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Mixer::_Open()
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{
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assert(!open);
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try {
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Open();
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open = true;
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failure = {};
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} catch (...) {
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failure = std::current_exception();
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throw;
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}
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}
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void
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Mixer::LockClose() noexcept
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{
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const std::scoped_lock lock{mutex};
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if (open)
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_Close();
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}
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void
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Mixer::_Close() noexcept
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{
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assert(open);
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Close();
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open = false;
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failure = {};
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}
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int
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Mixer::LockGetVolume()
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{
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const std::scoped_lock lock{mutex};
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if (!open) {
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if (IsGlobal() && !failure)
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_Open();
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else
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return -1;
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}
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try {
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return GetVolume();
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} catch (...) {
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_Close();
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failure = std::current_exception();
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throw;
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}
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}
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void
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Mixer::LockSetVolume(unsigned volume)
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{
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assert(volume <= 100);
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const std::scoped_lock lock{mutex};
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if (!open) {
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if (failure)
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std::rethrow_exception(failure);
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else if (IsGlobal())
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_Open();
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else
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return;
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}
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SetVolume(volume);
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}
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