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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* Copyright (C) 2003-2013 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 "VolumeFilterPlugin.hxx"
#include "FilterPlugin.hxx"
#include "FilterInternal.hxx"
#include "FilterRegistry.hxx"
#include "pcm/PcmVolume.hxx"
#include "pcm/PcmBuffer.hxx"
#include "AudioFormat.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include <glib.h>
#include <assert.h>
#include <string.h>
class VolumeFilter final : public Filter {
/**
* The current volume, from 0 to #PCM_VOLUME_1.
*/
unsigned volume;
AudioFormat format;
PcmBuffer buffer;
public:
VolumeFilter()
:volume(PCM_VOLUME_1) {}
unsigned GetVolume() const {
assert(volume <= PCM_VOLUME_1);
return volume;
}
void SetVolume(unsigned _volume) {
assert(_volume <= PCM_VOLUME_1);
volume = _volume;
}
virtual AudioFormat Open(AudioFormat &af, Error &error) override;
virtual void Close();
virtual const void *FilterPCM(const void *src, size_t src_size,
size_t *dest_size_r, Error &error);
};
static constexpr Domain volume_domain("pcm_volume");
static Filter *
volume_filter_init(gcc_unused const config_param ¶m,
gcc_unused Error &error)
{
return new VolumeFilter();
}
AudioFormat
VolumeFilter::Open(AudioFormat &audio_format, gcc_unused Error &error)
{
format = audio_format;
return format;
}
void
VolumeFilter::Close()
{
buffer.Clear();
}
const void *
VolumeFilter::FilterPCM(const void *src, size_t src_size,
size_t *dest_size_r, Error &error)
{
*dest_size_r = src_size;
if (volume >= PCM_VOLUME_1)
/* optimized special case: 100% volume = no-op */
return src;
void *dest = buffer.Get(src_size);
if (volume <= 0) {
/* optimized special case: 0% volume = memset(0) */
/* XXX is this valid for all sample formats? What
about floating point? */
memset(dest, 0, src_size);
return dest;
}
memcpy(dest, src, src_size);
bool success = pcm_volume(dest, src_size,
format.format,
volume);
if (!success) {
error.Set(volume_domain, "pcm_volume() has failed");
return NULL;
}
return dest;
}
const struct filter_plugin volume_filter_plugin = {
"volume",
volume_filter_init,
};
unsigned
volume_filter_get(const Filter *_filter)
{
const VolumeFilter *filter =
(const VolumeFilter *)_filter;
return filter->GetVolume();
}
void
volume_filter_set(Filter *_filter, unsigned volume)
{
VolumeFilter *filter = (VolumeFilter *)_filter;
filter->SetVolume(volume);
}
|
