OpenShot Library | OpenShotAudio 0.2.2
juce_ProcessorDuplicator.h
1
2/** @weakgroup juce_dsp-processors
3 * @{
4 */
5/*
6 ==============================================================================
7
8 This file is part of the JUCE library.
9 Copyright (c) 2017 - ROLI Ltd.
10
11 JUCE is an open source library subject to commercial or open-source
12 licensing.
13
14 By using JUCE, you agree to the terms of both the JUCE 5 End-User License
15 Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
16 27th April 2017).
17
18 End User License Agreement: www.juce.com/juce-5-licence
19 Privacy Policy: www.juce.com/juce-5-privacy-policy
20
21 Or: You may also use this code under the terms of the GPL v3 (see
22 www.gnu.org/licenses).
23
24 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
25 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
26 DISCLAIMED.
27
28 ==============================================================================
29*/
30
31namespace juce
32{
33namespace dsp
34{
35
36/**
37 Converts a mono processor class into a multi-channel version by duplicating it
38 and applying multichannel buffers across an array of instances.
39
40 When the prepare method is called, it uses the specified number of channels to
41 instantiate the appropriate number of instances, which it then uses in its
42 process() method.
43
44 @tags{DSP}
45*/
46template <typename MonoProcessorType, typename StateType>
48{
49 ProcessorDuplicator() : state (new StateType()) {}
50 ProcessorDuplicator (StateType* stateToUse) : state (stateToUse) {}
51 ProcessorDuplicator (typename StateType::Ptr stateToUse) : state (std::move (stateToUse)) {}
54
55 void prepare (const ProcessSpec& spec)
56 {
57 processors.removeRange ((int) spec.numChannels, processors.size());
58
59 while (static_cast<size_t> (processors.size()) < spec.numChannels)
60 processors.add (new MonoProcessorType (state));
61
62 auto monoSpec = spec;
63 monoSpec.numChannels = 1;
64
65 for (auto* p : processors)
66 p->prepare (monoSpec);
67 }
68
69 void reset() noexcept { for (auto* p : processors) p->reset(); }
70
71 template<typename ProcessContext>
72 void process (const ProcessContext& context) noexcept
73 {
74 jassert ((int) context.getInputBlock().getNumChannels() <= processors.size());
75 jassert ((int) context.getOutputBlock().getNumChannels() <= processors.size());
76
77 auto numChannels = static_cast<size_t> (jmin (context.getInputBlock().getNumChannels(),
78 context.getOutputBlock().getNumChannels()));
79
80 for (size_t chan = 0; chan < numChannels; ++chan)
81 processors[(int) chan]->process (MonoProcessContext<ProcessContext> (context, chan));
82 }
83
84 typename StateType::Ptr state;
85
86private:
87 template <typename ProcessContext>
88 struct MonoProcessContext : public ProcessContext
89 {
90 MonoProcessContext (const ProcessContext& multiChannelContext, size_t channelToUse)
91 : ProcessContext (multiChannelContext), channel (channelToUse)
92 {}
93
94 size_t channel;
95
96 typename ProcessContext::ConstAudioBlockType getInputBlock() const noexcept { return ProcessContext::getInputBlock() .getSingleChannelBlock (channel); }
97 typename ProcessContext::AudioBlockType getOutputBlock() const noexcept { return ProcessContext::getOutputBlock().getSingleChannelBlock (channel); }
98 };
99
101};
102
103} // namespace dsp
104} // namespace juce
105
106/** @}*/
int size() const noexcept
Returns the number of items currently in the array.
ObjectClass * add(ObjectClass *newObject)
Appends a new object to the end of the array.
void removeRange(int startIndex, int numberToRemove, bool deleteObjects=true)
Removes a range of objects from the array.
uint32 numChannels
The number of channels that the process() method will be expected to handle.
This structure is passed into a DSP algorithm's prepare() method, and contains information about vari...
Converts a mono processor class into a multi-channel version by duplicating it and applying multichan...