OpenShot Library | libopenshot-audio 0.2.0
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
23namespace 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//==============================================================================
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
Holds a resizable array of primitive or copy-by-value objects.
Definition juce_Array.h:60
ElementType getUnchecked(int index) const
Returns one of the elements in the array, without checking the index passed in.
Definition juce_Array.h:256
int size() const noexcept
Returns the current number of elements in the array.
Definition juce_Array.h:219
void add(const ElementType &newElement)
Appends a new element at the end of the array.
Definition juce_Array.h:375
Base class for objects that can produce a continuous stream of audio.
A set of coefficients for use in an IIRFilter object.
void makeInactive()
Calls IIRFilter::makeInactive() on all the filters being used internally.
void prepareToPlay(int samplesPerBlockExpected, double sampleRate) override
Tells the source to prepare for playing.
void setCoefficients(const IIRCoefficients &newCoefficients)
Changes the filter to use the same parameters as the one being passed in.
IIRFilterAudioSource(AudioSource *inputSource, bool deleteInputWhenDeleted)
Creates a IIRFilterAudioSource for a given input source.
void releaseResources() override
Allows the source to release anything it no longer needs after playback has stopped.
~IIRFilterAudioSource() override
Destructor.
void getNextAudioBlock(const AudioSourceChannelInfo &) override
Called repeatedly to fetch subsequent blocks of audio data.
An IIR filter that can perform low, high, or band-pass filtering on an audio signal.
Used by AudioSource::getNextAudioBlock().