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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* 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 "ReplayGainFilterPlugin.hxx"
#include "FilterPlugin.hxx"
#include "FilterInternal.hxx"
#include "FilterRegistry.hxx"
#include "AudioFormat.hxx"
#include "replay_gain_info.h"
#include "replay_gain_config.h"
#include "MixerControl.hxx"
#include "pcm/PcmVolume.hxx"
#include "pcm/PcmBuffer.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;
enum replay_gain_mode mode;
struct replay_gain_info info;
/**
* The current volume, 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.
*/
unsigned volume;
AudioFormat format;
PcmBuffer buffer;
public:
ReplayGainFilter()
:mixer(nullptr), mode(REPLAY_GAIN_OFF),
volume(PCM_VOLUME_1) {
replay_gain_info_init(&info);
}
void SetMixer(Mixer *_mixer, unsigned _base) {
assert(_mixer == NULL || (_base > 0 && _base <= 100));
mixer = _mixer;
base = _base;
Update();
}
void SetInfo(const struct replay_gain_info *_info) {
if (_info != NULL) {
info = *_info;
replay_gain_info_complete(&info);
} else
replay_gain_info_init(&info);
Update();
}
void SetMode(enum replay_gain_mode _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 const void *FilterPCM(const void *src, size_t src_size,
size_t *dest_size_r, Error &error);
};
void
ReplayGainFilter::Update()
{
if (mode != REPLAY_GAIN_OFF) {
float scale = replay_gain_tuple_scale(&info.tuples[mode],
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);
} else
volume = PCM_VOLUME_1;
if (mixer != NULL) {
/* 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)
{
format = af;
return format;
}
void
ReplayGainFilter::Close()
{
buffer.Clear();
}
const void *
ReplayGainFilter::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(replay_gain_domain, "pcm_volume() has failed");
return NULL;
}
return dest;
}
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 replay_gain_info *info)
{
ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
filter->SetInfo(info);
}
void
replay_gain_filter_set_mode(Filter *_filter, enum replay_gain_mode mode)
{
ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
filter->SetMode(mode);
}
|
