1 /*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2020 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21 */
22
23 namespace juce
24 {
25
IIRFilterAudioSource(AudioSource * const inputSource,const bool deleteInputWhenDeleted)26 IIRFilterAudioSource::IIRFilterAudioSource (AudioSource* const inputSource,
27 const bool deleteInputWhenDeleted)
28 : input (inputSource, deleteInputWhenDeleted)
29 {
30 jassert (inputSource != nullptr);
31
32 for (int i = 2; --i >= 0;)
33 iirFilters.add (new IIRFilter());
34 }
35
~IIRFilterAudioSource()36 IIRFilterAudioSource::~IIRFilterAudioSource() {}
37
38 //==============================================================================
setCoefficients(const IIRCoefficients & newCoefficients)39 void IIRFilterAudioSource::setCoefficients (const IIRCoefficients& newCoefficients)
40 {
41 for (int i = iirFilters.size(); --i >= 0;)
42 iirFilters.getUnchecked(i)->setCoefficients (newCoefficients);
43 }
44
makeInactive()45 void IIRFilterAudioSource::makeInactive()
46 {
47 for (int i = iirFilters.size(); --i >= 0;)
48 iirFilters.getUnchecked(i)->makeInactive();
49 }
50
51 //==============================================================================
prepareToPlay(int samplesPerBlockExpected,double sampleRate)52 void IIRFilterAudioSource::prepareToPlay (int samplesPerBlockExpected, double sampleRate)
53 {
54 input->prepareToPlay (samplesPerBlockExpected, sampleRate);
55
56 for (int i = iirFilters.size(); --i >= 0;)
57 iirFilters.getUnchecked(i)->reset();
58 }
59
releaseResources()60 void IIRFilterAudioSource::releaseResources()
61 {
62 input->releaseResources();
63 }
64
getNextAudioBlock(const AudioSourceChannelInfo & bufferToFill)65 void IIRFilterAudioSource::getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill)
66 {
67 input->getNextAudioBlock (bufferToFill);
68
69 const int numChannels = bufferToFill.buffer->getNumChannels();
70
71 while (numChannels > iirFilters.size())
72 iirFilters.add (new IIRFilter (*iirFilters.getUnchecked (0)));
73
74 for (int i = 0; i < numChannels; ++i)
75 iirFilters.getUnchecked(i)
76 ->processSamples (bufferToFill.buffer->getWritePointer (i, bufferToFill.startSample),
77 bufferToFill.numSamples);
78 }
79
80 } // namespace juce
81