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
|
/*
* flangereffect.cpp - defination of FlangerEffect class.
*
* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
*
* This file is part of LMMS - https://lmms.io
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
*/
#include "FlangerEffect.h"
#include "Engine.h"
#include "embed.cpp"
extern "C"
{
Plugin::Descriptor PLUGIN_EXPORT flanger_plugin_descriptor =
{
STRINGIFY( PLUGIN_NAME ),
"Flanger",
QT_TRANSLATE_NOOP( "pluginBrowser", "A native flanger plugin" ),
"Dave French <contact/dot/dave/dot/french3/at/googlemail/dot/com>",
0x0100,
Plugin::Effect,
new PluginPixmapLoader( "logo" ),
NULL,
NULL
} ;
FlangerEffect::FlangerEffect( Model *parent, const Plugin::Descriptor::SubPluginFeatures::Key *key ) :
Effect( &flanger_plugin_descriptor, parent, key ),
m_flangerControls( this )
{
m_lfo = new QuadratureLfo( Engine::mixer()->processingSampleRate() );
m_lDelay = new MonoDelay( 1, Engine::mixer()->processingSampleRate() );
m_rDelay = new MonoDelay( 1, Engine::mixer()->processingSampleRate() );
m_noise = new Noise;
}
FlangerEffect::~FlangerEffect()
{
if(m_lDelay )
{
delete m_lDelay;
}
if( m_rDelay )
{
delete m_rDelay;
}
if( m_lfo )
{
delete m_lfo;
}
if(m_noise)
{
delete m_noise;
}
}
bool FlangerEffect::processAudioBuffer( sampleFrame *buf, const fpp_t frames )
{
if( !isEnabled() || !isRunning () )
{
return( false );
}
double outSum = 0.0;
const float d = dryLevel();
const float w = wetLevel();
const float length = m_flangerControls.m_delayTimeModel.value() * Engine::mixer()->processingSampleRate();
const float noise = m_flangerControls.m_whiteNoiseAmountModel.value();
float amplitude = m_flangerControls.m_lfoAmountModel.value() * Engine::mixer()->processingSampleRate();
bool invertFeedback = m_flangerControls.m_invertFeedbackModel.value();
m_lfo->setFrequency( 1.0/m_flangerControls.m_lfoFrequencyModel.value() );
m_lDelay->setFeedback( m_flangerControls.m_feedbackModel.value() );
m_rDelay->setFeedback( m_flangerControls.m_feedbackModel.value() );
sample_t dryS[2];
float leftLfo;
float rightLfo;
for( fpp_t f = 0; f < frames; ++f )
{
buf[f][0] += m_noise->tick() * noise;
buf[f][1] += m_noise->tick() * noise;
dryS[0] = buf[f][0];
dryS[1] = buf[f][1];
m_lfo->tick(&leftLfo, &rightLfo);
m_lDelay->setLength( ( float )length + amplitude * (leftLfo+1.0) );
m_rDelay->setLength( ( float )length + amplitude * (rightLfo+1.0) );
if(invertFeedback)
{
m_lDelay->tick( &buf[f][1] );
m_rDelay->tick(&buf[f][0] );
} else
{
m_lDelay->tick( &buf[f][0] );
m_rDelay->tick( &buf[f][1] );
}
buf[f][0] = ( d * dryS[0] ) + ( w * buf[f][0] );
buf[f][1] = ( d * dryS[1] ) + ( w * buf[f][1] );
outSum += buf[f][0]*buf[f][0] + buf[f][1]*buf[f][1];
}
checkGate( outSum / frames );
return isRunning();
}
void FlangerEffect::changeSampleRate()
{
m_lfo->setSampleRate( Engine::mixer()->processingSampleRate() );
m_lDelay->setSampleRate( Engine::mixer()->processingSampleRate() );
m_rDelay->setSampleRate( Engine::mixer()->processingSampleRate() );
}
void FlangerEffect::restartLFO()
{
m_lfo->restart();
}
extern "C"
{
//needed for getting plugin out of shared lib
Plugin * PLUGIN_EXPORT lmms_plugin_main( Model* parent, void* data )
{
return new FlangerEffect( parent , static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
}
}}
|
