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/*
* Copyright 2003-2017 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_VOLUME_HXX
#define MPD_VOLUME_HXX
#include "util/Compiler.h"
class MultipleOutputs;
class BufferedOutputStream;
void
InvalidateHardwareVolume() noexcept;
gcc_pure
int
volume_level_get(const MultipleOutputs &outputs) noexcept;
bool
volume_level_change(MultipleOutputs &outputs, unsigned volume);
bool
read_sw_volume_state(const char *line, MultipleOutputs &outputs);
void
save_sw_volume_state(BufferedOutputStream &os);
/**
* Generates a hash number for the current state of the software
* volume control. This is used by timer_save_state_file() to
* determine whether the state has changed and the state file should
* be saved.
*/
gcc_pure
unsigned
sw_volume_state_get_hash() noexcept;
#endif
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