1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* Copyright (C) 2003-2014 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.
*/
#include "config.h"
#include "Volume.hxx"
#include "output/MultipleOutputs.hxx"
#include "Idle.hxx"
#include "util/StringUtil.hxx"
#include "util/Domain.hxx"
#include "system/PeriodClock.hxx"
#include "fs/io/BufferedOutputStream.hxx"
#include "Log.hxx"
#include <assert.h>
#include <stdlib.h>
#define SW_VOLUME_STATE "sw_volume: "
static constexpr Domain volume_domain("volume");
static unsigned volume_software_set = 100;
/** the cached hardware mixer value; invalid if negative */
static int last_hardware_volume = -1;
/** the age of #last_hardware_volume */
static PeriodClock hardware_volume_clock;
void
InvalidateHardwareVolume()
{
/* flush the hardware volume cache */
last_hardware_volume = -1;
}
int
volume_level_get(const MultipleOutputs &outputs)
{
if (last_hardware_volume >= 0 &&
!hardware_volume_clock.CheckUpdate(1000))
/* throttle access to hardware mixers */
return last_hardware_volume;
last_hardware_volume = outputs.GetVolume();
return last_hardware_volume;
}
static bool
software_volume_change(MultipleOutputs &outputs, unsigned volume)
{
assert(volume <= 100);
volume_software_set = volume;
outputs.SetSoftwareVolume(volume);
return true;
}
static bool
hardware_volume_change(MultipleOutputs &outputs, unsigned volume)
{
/* reset the cache */
last_hardware_volume = -1;
return outputs.SetVolume(volume);
}
bool
volume_level_change(MultipleOutputs &outputs, unsigned volume)
{
assert(volume <= 100);
volume_software_set = volume;
idle_add(IDLE_MIXER);
return hardware_volume_change(outputs, volume);
}
bool
read_sw_volume_state(const char *line, MultipleOutputs &outputs)
{
char *end = nullptr;
long int sv;
if (!StringStartsWith(line, SW_VOLUME_STATE))
return false;
line += sizeof(SW_VOLUME_STATE) - 1;
sv = strtol(line, &end, 10);
if (*end == 0 && sv >= 0 && sv <= 100)
software_volume_change(outputs, sv);
else
FormatWarning(volume_domain,
"Can't parse software volume: %s", line);
return true;
}
void
save_sw_volume_state(BufferedOutputStream &os)
{
os.Format(SW_VOLUME_STATE "%u\n", volume_software_set);
}
unsigned
sw_volume_state_get_hash(void)
{
return volume_software_set;
}
|
