MPD: mixer/Volume.hxx Source File

MPD 0.20.18

Volume.hxx
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1 /*
2 * Copyright 2003-2017 The Music Player Daemon Project
3 * http://www.musicpd.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef MPD_VOLUME_HXX
21 #define MPD_VOLUME_HXX
22
23 #include "Compiler.h"
24
25 class MultipleOutputs;
26 class BufferedOutputStream;
27
28 void
29 InvalidateHardwareVolume() noexcept;
30
31 gcc_pure
32 int
33 volume_level_get(const MultipleOutputs &outputs) noexcept;
34
35 bool
36 volume_level_change(MultipleOutputs &outputs, unsigned volume);
37
38 bool
39 read_sw_volume_state(const char *line, MultipleOutputs &outputs);
40
41 void
42 save_sw_volume_state(BufferedOutputStream &os);
43
50 gcc_pure
51 unsigned
52 sw_volume_state_get_hash() noexcept;
53
54 #endif
volume_level_change
bool volume_level_change(MultipleOutputs &outputs, unsigned volume)
read_sw_volume_state
bool read_sw_volume_state(const char *line, MultipleOutputs &outputs)
sw_volume_state_get_hash
gcc_pure unsigned sw_volume_state_get_hash() noexcept
Generates a hash number for the current state of the software volume control.
Compiler.h
volume_level_get
gcc_pure int volume_level_get(const MultipleOutputs &outputs) noexcept
MultipleOutputs
Definition: MultipleOutputs.hxx:47
BufferedOutputStream
An OutputStream wrapper that buffers its output to reduce the number of OutputStream::Write() calls...
Definition: BufferedOutputStream.hxx:41
save_sw_volume_state
void save_sw_volume_state(BufferedOutputStream &os)
gcc_pure
#define gcc_pure
Definition: Compiler.h:116
InvalidateHardwareVolume
void InvalidateHardwareVolume() noexcept