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
|
/*
* stereodelay.cpp - defination of StereoDelay 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 "StereoDelay.h"
#include <cstdlib>
#include "lmms_basics.h"
#include "interpolation.h"
#include "lmms_math.h"
StereoDelay::StereoDelay( int maxTime, int sampleRate )
{
m_buffer = 0;
m_maxTime = maxTime;
m_maxLength = maxTime * sampleRate;
m_length = m_maxLength;
m_writeIndex = 0;
m_feedback = 0.0f;
setSampleRate( sampleRate );
}
StereoDelay::~StereoDelay()
{
if( m_buffer )
{
delete[] m_buffer;
}
}
void StereoDelay::tick( sampleFrame frame )
{
m_writeIndex = ( m_writeIndex + 1 ) % ( int )m_maxLength;
int readIndex = m_writeIndex - m_length;
if (readIndex < 0 ) { readIndex += m_maxLength; }
float lOut = m_buffer[ readIndex ][ 0 ];
float rOut = m_buffer[ readIndex ] [1 ];
m_buffer[ m_writeIndex ][ 0 ] = frame[ 0 ] + ( lOut * m_feedback );
m_buffer[ m_writeIndex ][ 1 ] = frame[ 1 ] + ( rOut * m_feedback );
frame[ 0 ] = lOut;
frame[ 1 ] = rOut;
}
void StereoDelay::setSampleRate( int sampleRate )
{
if( m_buffer )
{
delete[] m_buffer;
}
int bufferSize = ( int )( sampleRate * m_maxTime );
m_buffer = new sampleFrame[bufferSize];
for( int i = 0 ; i < bufferSize ; i++)
{
m_buffer[i][0] = 0.0;
m_buffer[i][1] = 0.0;
}
}
|
