OpenShot Audio Library | OpenShotAudio  0.3.0
juce_IIRFilterAudioSource.cpp
1 /*
2  ==============================================================================
3 
4  This file is part of the JUCE library.
5  Copyright (c) 2017 - ROLI Ltd.
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 
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 
37 
38 //==============================================================================
40 {
41  for (int i = iirFilters.size(); --i >= 0;)
42  iirFilters.getUnchecked(i)->setCoefficients (newCoefficients);
43 }
44 
46 {
47  for (int i = iirFilters.size(); --i >= 0;)
48  iirFilters.getUnchecked(i)->makeInactive();
49 }
50 
51 //==============================================================================
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 
61 {
62  input->releaseResources();
63 }
64 
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
Type * getWritePointer(int channelNumber) noexcept
int getNumChannels() const noexcept
void prepareToPlay(int samplesPerBlockExpected, double sampleRate) override
void setCoefficients(const IIRCoefficients &newCoefficients)
IIRFilterAudioSource(AudioSource *inputSource, bool deleteInputWhenDeleted)
void getNextAudioBlock(const AudioSourceChannelInfo &) override
AudioBuffer< float > * buffer