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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* 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 "ReplayGainFilterPlugin.hxx"
#include "filter/FilterPlugin.hxx"
#include "filter/FilterInternal.hxx"
#include "filter/FilterRegistry.hxx"
#include "AudioFormat.hxx"
#include "ReplayGainInfo.hxx"
#include "ReplayGainConfig.hxx"
#include "mixer/MixerControl.hxx"
#include "pcm/Volume.hxx"
#include "pcm/PcmBuffer.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <assert.h>
#include <string.h>
static constexpr Domain replay_gain_domain("replay_gain");
class ReplayGainFilter final : public Filter {
/**
* If set, then this hardware mixer is used for applying
* replay gain, instead of the software volume library.
*/
Mixer *mixer;
/**
* The base volume level for scale=1.0, between 1 and 100
* (including).
*/
unsigned base;
ReplayGainMode mode;
ReplayGainInfo info;
/**
* About the current volume: it is between 0 and a value that
* may or may not exceed #PCM_VOLUME_1.
*
* If the default value of true is used for replaygain_limit, the
* application of the volume to the signal will never cause clipping.
*
* On the other hand, if the user has set replaygain_limit to false,
* the chance of clipping is explicitly preferred if that's required to
* maintain a consistent audio level. Whether clipping will actually
* occur depends on what value the user is using for replaygain_preamp.
*/
PcmVolume pv;
public:
ReplayGainFilter()
:mixer(nullptr), mode(REPLAY_GAIN_OFF) {
info.Clear();
}
void SetMixer(Mixer *_mixer, unsigned _base) {
assert(_mixer == nullptr || (_base > 0 && _base <= 100));
mixer = _mixer;
base = _base;
Update();
}
void SetInfo(const ReplayGainInfo *_info) {
if (_info != nullptr) {
info = *_info;
info.Complete();
} else
info.Clear();
Update();
}
void SetMode(ReplayGainMode _mode) {
if (_mode == mode)
/* no change */
return;
FormatDebug(replay_gain_domain,
"replay gain mode has changed %d->%d\n",
mode, _mode);
mode = _mode;
Update();
}
/**
* Recalculates the new volume after a property was changed.
*/
void Update();
virtual AudioFormat Open(AudioFormat &af, Error &error) override;
virtual void Close();
virtual ConstBuffer<void> FilterPCM(ConstBuffer<void> src,
Error &error) override;
};
void
ReplayGainFilter::Update()
{
unsigned volume = PCM_VOLUME_1;
if (mode != REPLAY_GAIN_OFF) {
const auto &tuple = info.tuples[mode];
float scale = tuple.CalculateScale(replay_gain_preamp,
replay_gain_missing_preamp,
replay_gain_limit);
FormatDebug(replay_gain_domain,
"scale=%f\n", (double)scale);
volume = pcm_float_to_volume(scale);
}
pv.SetVolume(volume);
if (mixer != nullptr) {
/* update the hardware mixer volume */
unsigned _volume = (volume * base) / PCM_VOLUME_1;
if (_volume > 100)
_volume = 100;
Error error;
if (!mixer_set_volume(mixer, _volume, error))
LogError(error, "Failed to update hardware mixer");
}
}
static Filter *
replay_gain_filter_init(gcc_unused const config_param ¶m,
gcc_unused Error &error)
{
return new ReplayGainFilter();
}
AudioFormat
ReplayGainFilter::Open(AudioFormat &af, gcc_unused Error &error)
{
if (!pv.Open(af.format, error))
return AudioFormat::Undefined();
return af;
}
void
ReplayGainFilter::Close()
{
pv.Close();
}
ConstBuffer<void>
ReplayGainFilter::FilterPCM(ConstBuffer<void> src, gcc_unused Error &error)
{
return pv.Apply(src);
}
const struct filter_plugin replay_gain_filter_plugin = {
"replay_gain",
replay_gain_filter_init,
};
void
replay_gain_filter_set_mixer(Filter *_filter, Mixer *mixer,
unsigned base)
{
ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
filter->SetMixer(mixer, base);
}
void
replay_gain_filter_set_info(Filter *_filter, const ReplayGainInfo *info)
{
ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
filter->SetInfo(info);
}
void
replay_gain_filter_set_mode(Filter *_filter, ReplayGainMode mode)
{
ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
filter->SetMode(mode);
}
|
