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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2017 - ROLI Ltd.
JUCE is an open source library subject to commercial or open-source
licensing.
By using JUCE, you agree to the terms of both the JUCE 5 End-User License
Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
27th April 2017).
End User License Agreement: www.juce.com/juce-5-licence
Privacy Policy: www.juce.com/juce-5-privacy-policy
Or: You may also use this code under the terms of the GPL v3 (see
www.gnu.org/licenses).
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
namespace dsp
{
#ifndef DOXYGEN
namespace ProcessorHelpers // Internal helper classes used in building the ProcessorChain
{
template <int arg>
struct AccessHelper
{
template <typename ProcessorType>
static auto& get (ProcessorType& a) noexcept { return AccessHelper<arg - 1>::get (a.processors); }
template <typename ProcessorType>
static const auto& get (const ProcessorType& a) noexcept { return AccessHelper<arg - 1>::get (a.processors); }
template <typename ProcessorType>
static void setBypassed (ProcessorType& a, bool bypassed) { AccessHelper<arg - 1>::setBypassed (a.processors, bypassed); }
};
template <>
struct AccessHelper<0>
{
template <typename ProcessorType>
static auto& get (ProcessorType& a) noexcept { return a.getProcessor(); }
template <typename ProcessorType>
static const auto& get (const ProcessorType& a) noexcept { return a.getProcessor(); }
template <typename ProcessorType>
static void setBypassed (ProcessorType& a, bool bypassed) { a.isBypassed = bypassed; }
};
//==============================================================================
template <bool isFirst, typename Processor, typename Subclass>
struct ChainElement
{
void prepare (const ProcessSpec& spec)
{
processor.prepare (spec);
}
template <typename ProcessContext>
void process (const ProcessContext& context) noexcept
{
if (context.usesSeparateInputAndOutputBlocks() && ! isFirst)
{
jassert (context.getOutputBlock().getNumChannels() == context.getInputBlock().getNumChannels());
ProcessContextReplacing<typename ProcessContext::SampleType> replacingContext (context.getOutputBlock());
replacingContext.isBypassed = (isBypassed || context.isBypassed);
processor.process (replacingContext);
}
else
{
ProcessContext contextCopy (context);
contextCopy.isBypassed = (isBypassed || context.isBypassed);
processor.process (contextCopy);
}
}
void reset()
{
processor.reset();
}
bool isBypassed = false;
Processor processor;
Processor& getProcessor() noexcept { return processor; }
const Processor& getProcessor() const noexcept { return processor; }
Subclass& getThis() noexcept { return *static_cast<Subclass*> (this); }
const Subclass& getThis() const noexcept { return *static_cast<const Subclass*> (this); }
template <int arg> auto& get() noexcept { return AccessHelper<arg>::get (getThis()); }
template <int arg> const auto& get() const noexcept { return AccessHelper<arg>::get (getThis()); }
template <int arg> void setBypassed (bool bypassed) noexcept { AccessHelper<arg>::setBypassed (getThis(), bypassed); }
};
//==============================================================================
template <bool isFirst, typename FirstProcessor, typename... SubsequentProcessors>
struct ChainBase : public ChainElement<isFirst, FirstProcessor, ChainBase<isFirst, FirstProcessor, SubsequentProcessors...>>
{
using Base = ChainElement<isFirst, FirstProcessor, ChainBase<isFirst, FirstProcessor, SubsequentProcessors...>>;
template <typename ProcessContext>
void process (const ProcessContext& context) noexcept { Base::process (context); processors.process (context); }
void prepare (const ProcessSpec& spec) { Base::prepare (spec); processors.prepare (spec); }
void reset() { Base::reset(); processors.reset(); }
ChainBase<false, SubsequentProcessors...> processors;
};
template <bool isFirst, typename ProcessorType>
struct ChainBase<isFirst, ProcessorType> : public ChainElement<isFirst, ProcessorType, ChainBase<isFirst, ProcessorType>> {};
}
#endif
//==============================================================================
/**
This variadically-templated class lets you join together any number of processor
classes into a single processor which will call process() on them all in sequence.
*/
template <typename... Processors>
using ProcessorChain = ProcessorHelpers::ChainBase<true, Processors...>;
} // namespace dsp
} // namespace juce
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