getAudioPluginInstance returns nullptr

Tracktion Engine
1

Hey,

I have an application consisting of a window with a button. This button opens up a filechooser window. When a file is chosen, it gets stored in a te::ExternalPlugin variable. This all works fine, however when i run getAudioPluginInstance(), nullptr is returned.

Why is this? Am i doing something wrong when setting up pluginDescription?

loadedPlugin->getName()

and

pluginDescription.pluginFormatName

both work correctly.

this is the relevant code:

juce::PluginDescription pluginDescription;
pluginDescription.fileOrIdentifier = selectedFile.getFullPathName();
pluginDescription.name = selectedFile.getFileNameWithoutExtension();
juce::String fileExtension = selectedFile.getFileExtension(); 
juce::String cleanedExtension = fileExtension.substring(1);   
pluginDescription.pluginFormatName = cleanedExtension;
auto pluginTree = tracktion_engine::ExternalPlugin::create(engine, pluginDescription);

if(pluginTree.isValid())
{
    tracktion_engine::PluginCreationInfo info{
                *edit, pluginTree, true
    };
    loadedPlugin = std::make_unique<tracktion_engine::ExternalPlugin>(info);
}

if (loadedPlugin)
{
    juce::Logger::writeToLog("Plugin loaded successfully: " + loadedPlugin->getName());
    juce::Logger::writeToLog("Plugin Format: " + pluginDescription.pluginFormatName);

    juce::AudioPluginInstance* audioProcessor = loadedPlugin->getAudioPluginInstance();
    
    //this is where the problem is
    if (audioProcessor != nullptr)
    {
        if (auto* editor = audioProcessor->createEditorIfNeeded())
        {
            pluginEditor.reset(editor);
            addAndMakeVisible(pluginEditor.get());
            resized();
        }
        else
        {
            juce::Logger::writeToLog("Failed to create plugin GUI.");
        }
    }
    else 
    {
        juce::Logger::writeToLog("Failed to get audioProcessor: ");
    }
}

this is all of the source code
Main.cpp (2.3 KB)
MainComponent.cpp (6.1 KB)
MainComponent.h (1.1 KB)

1 Like
2

You’d normally create the plugin via the Edit’s PluginCache:

auto plugin = edit.getPluginCache().createNewPlugin (ExternalPlugin::xmlTypeName, pluginDescription)

But that’s separate to your issue.
Where are you getting your juce::PluginDescription from?
That usually comes from juce::KnownPluginList, there’s an instance in Engine::getPluginManager() you can use but you’ll have to do a plugin scan first or juce won’t know how to load the plugin.