juce_AudioPluginFormat.cpp

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 /*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   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 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-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
{
 
AudioPluginFormat::AudioPluginFormat() {}
AudioPluginFormat::~AudioPluginFormat() {}
 
std::unique_ptr<AudioPluginInstance> AudioPluginFormat::createInstanceFromDescription (const PluginDescription& desc,
                                                                                       double initialSampleRate,
                                                                                       int initialBufferSize)
{
    String errorMessage;
    return createInstanceFromDescription (desc, initialSampleRate, initialBufferSize, errorMessage);
}
 
std::unique_ptr<AudioPluginInstance> AudioPluginFormat::createInstanceFromDescription (const PluginDescription& desc,
                                                                                       double initialSampleRate,
                                                                                       int initialBufferSize,
                                                                                       String& errorMessage)
{
    if (MessageManager::getInstance()->isThisTheMessageThread()
          && requiresUnblockedMessageThreadDuringCreation (desc))
    {
        errorMessage = NEEDS_TRANS ("This plug-in cannot be instantiated synchronously");
        return {};
    }
 
    WaitableEvent finishedSignal;
    std::unique_ptr<AudioPluginInstance> instance;
 
    auto callback = [&] (std::unique_ptr<AudioPluginInstance> p, const String& error)
    {
       errorMessage = error;
       instance = std::move (p);
       finishedSignal.signal();
    };
 
    if (! MessageManager::getInstance()->isThisTheMessageThread())
        createPluginInstanceAsync (desc, initialSampleRate, initialBufferSize, std::move (callback));
    else
        createPluginInstance (desc, initialSampleRate, initialBufferSize, std::move (callback));
 
    finishedSignal.wait();
    return instance;
}
 
struct AudioPluginFormat::AsyncCreateMessage final : public Message
{
    AsyncCreateMessage (const PluginDescription& d, double sr, int size, PluginCreationCallback call)
        : desc (d), sampleRate (sr), bufferSize (size), callbackToUse (std::move (call))
    {
    }
 
    PluginDescription desc;
    double sampleRate;
    int bufferSize;
    PluginCreationCallback callbackToUse;
};
 
void AudioPluginFormat::createPluginInstanceAsync (const PluginDescription& description,
                                                   double initialSampleRate, int initialBufferSize,
                                                   PluginCreationCallback callback)
{
    jassert (callback != nullptr);
    postMessage (new AsyncCreateMessage (description, initialSampleRate, initialBufferSize, std::move (callback)));
}
 
void AudioPluginFormat::handleMessage (const Message& message)
{
    if (auto m = dynamic_cast<const AsyncCreateMessage*> (&message))
        createPluginInstance (m->desc, m->sampleRate, m->bufferSize, std::move (m->callbackToUse));
}
 
} // namespace juce