blob: 52cbb6425406b0a14c570095a1dc5fe69f062cf4 (
plain)
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
|
/*
* $Id$
*
* ***** BEGIN LGPL LICENSE BLOCK *****
*
* Copyright 2009 Jörg Hermann Müller
*
* This file is part of AudaSpace.
*
* AudaSpace is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* AudaSpace 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
*
* ***** END LGPL LICENSE BLOCK *****
*/
#ifndef AUD_BUTTERWORTHREADER
#define AUD_BUTTERWORTHREADER
#include "AUD_EffectReader.h"
#include "AUD_Buffer.h"
/**
* This class represents a butterworth filter.
*/
class AUD_ButterworthReader : public AUD_EffectReader
{
private:
/**
* The playback buffer.
*/
AUD_Buffer m_buffer;
/**
* The last out values buffer.
*/
AUD_Buffer m_outvalues;
/**
* The last in values buffer.
*/
AUD_Buffer m_invalues;
/**
* The position for buffer cycling.
*/
int m_position;
/**
* Filter coefficients.
*/
float m_coeff[2][5];
// hide copy constructor and operator=
AUD_ButterworthReader(const AUD_ButterworthReader&);
AUD_ButterworthReader& operator=(const AUD_ButterworthReader&);
public:
/**
* Creates a new butterworth reader.
* \param reader The reader to read from.
* \param attack The attack value in seconds.
* \param release The release value in seconds.
* \param threshold The threshold value.
* \param arthreshold The attack/release threshold value.
*/
AUD_ButterworthReader(AUD_IReader* reader, float frequency);
virtual void read(int & length, sample_t* & buffer);
};
#endif //AUD_BUTTERWORTHREADER
|
