100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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namespace dsp
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{
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/**
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Converts a mono processor class into a multi-channel version by duplicating it
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and applying multichannel buffers across an array of instances.
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When the prepare method is called, it uses the specified number of channels to
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instantiate the appropriate number of instances, which it then uses in its
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process() method.
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@tags{DSP}
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*/
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template <typename MonoProcessorType, typename StateType>
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struct ProcessorDuplicator
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{
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ProcessorDuplicator() : state (new StateType()) {}
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ProcessorDuplicator (StateType* stateToUse) : state (stateToUse) {}
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ProcessorDuplicator (const ProcessorDuplicator&) = default;
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ProcessorDuplicator (ProcessorDuplicator&&) = default;
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void prepare (const ProcessSpec& spec)
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{
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processors.removeRange ((int) spec.numChannels, processors.size());
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while (static_cast<size_t> (processors.size()) < spec.numChannels)
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processors.add (new MonoProcessorType (state));
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auto monoSpec = spec;
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monoSpec.numChannels = 1;
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for (auto* p : processors)
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p->prepare (monoSpec);
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}
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void reset() noexcept { for (auto* p : processors) p->reset(); }
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template<typename ProcessContext>
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void process (const ProcessContext& context) noexcept
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{
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jassert ((int) context.getInputBlock().getNumChannels() <= processors.size());
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jassert ((int) context.getOutputBlock().getNumChannels() <= processors.size());
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auto numChannels = static_cast<size_t> (jmin (context.getInputBlock().getNumChannels(),
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context.getOutputBlock().getNumChannels()));
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for (size_t chan = 0; chan < numChannels; ++chan)
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processors[(int) chan]->process (MonoProcessContext<ProcessContext> (context, chan));
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}
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typename StateType::Ptr state;
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private:
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template <typename ProcessContext>
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struct MonoProcessContext : public ProcessContext
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{
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MonoProcessContext (const ProcessContext& multiChannelContext, size_t channelToUse)
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: ProcessContext (multiChannelContext), channel (channelToUse)
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{}
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size_t channel;
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typename ProcessContext::AudioBlockType getInputBlock() const noexcept { return ProcessContext::getInputBlock().getSingleChannelBlock (channel); }
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typename ProcessContext::AudioBlockType getOutputBlock() const noexcept { return ProcessContext::getOutputBlock().getSingleChannelBlock (channel); }
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};
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juce::OwnedArray<MonoProcessorType> processors;
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};
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} // namespace dsp
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} // namespace juce
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