Howdy. I’ve been studying the Plugin Host project and have been able to create a project that lets me create windows for plugins very easily, which is great. It has a comboBox that I can select a plugin from, and that plugin pops up in a window. No assertions, no crashes, everything works great, which I am really surprised about lol.
As with the Plugin Host, I have added the midikeyboardComponent to the bottom of the window, and now i’m trying to get midi data from the MidiKeyboardComponent instance into the loaded audio plugin and out to the speakers. When i assign the loaded AudioPluginInstance to my class member AudioProcessPlayer, i get an EXC_BAD_ACCESS here in AudioProcessorPlayer::setProcessor(AudioProcessor* const processorToPlay) on line 66:
if (oldOne != nullptr)
oldOne->releaseResources();
here’s how my class is set up:
private:
AudioDeviceManager audioDeviceManager; //you need this so you can talk to the hardware!
ScopedPointer<ApplicationProperties> appProperties; //you need this to easily store the known working plugins.
KnownPluginList knownPluginList; //you need this so you can know which plugins exist on the system
AudioPluginFormatManager pluginFormatManager; //you need this to know which formats of plugins you can use.
AudioProcessorPlayer audioProcessorPlayer;
ScopedPointer<ComboBox> pluginComboBox;
ScopedPointer<TextButton> optionsButton;
ScopedPointer<PluginListWindow> pluginListWindow;
ScopedPointer<PluginWindow> pluginWindow;
ScopedPointer<AudioPluginInstance> loadedPlugin;
MidiKeyboardState midiKeyboardState;
ScopedPointer<MidiKeyboardComponent> midiKeyboardComponent;
Here’s how my plugin is loaded when chosen from the list of Plugins in the comboBox:
void MainContentComponent::comboBoxChanged(juce::ComboBox *comboBoxThatHasChanged) {
if( comboBoxThatHasChanged == pluginComboBox ) {
if( comboBoxThatHasChanged->getSelectedId() > 0 ) {
auto pluginDescription = knownPluginList.getType(comboBoxThatHasChanged->getSelectedId() - 1 );
//create a DocumentWindow that holds our plugin's AudioProcessorEditor if it has one
pluginFormatManager.createPluginInstanceAsync(*pluginDescription,
44100,
512,
[this](AudioPluginInstance* instance, const String& error)
{
this->createPluginWindowCallback(instance, error);
}
);
}
}
}
void MainContentComponent::createPluginWindowCallback(juce::AudioPluginInstance* instance, const juce::String &error) {
if( instance == nullptr ) {
AlertWindow::showMessageBox(AlertWindow::WarningIcon, "Couldn't create Plugin", error);
} else {
//create a documentWindow
if (pluginWindow != nullptr) { //Header file: ScopedPointer<PluginWindow> pluginWindow;
pluginWindow = nullptr;
loadedPlugin = nullptr;
}
loadedPlugin = instance; //Header file: ScopedPointer<AudioPluginInstance> loadedPlugin;
pluginWindow = new PluginWindow(*this, instance->createEditorIfNeeded() );
pluginWindow->toFront(true);
}
}
As I said early, this works excellent/perfect.
When I add
instance->enableAllBuses();
audioProcessorPlayer.setProcessor(instance);
audioProcessorPlayer.setDoublePrecisionProcessing( instance->supportsDoublePrecisionProcessing() );
after pluginWindow->toFront(true);, I get the EXC_BAD_ACCESS crash.
I’m initializing my audioDeviceManager as follows in the constructor:
audioDeviceManager.initialise(0, 2, nullptr, true);
audioDeviceManager.addMidiInputCallback(String(), this);
audioProcessorPlayer.setProcessor(nullptr);
audioDeviceManager.addAudioCallback(&audioProcessorPlayer);
What am I missing for setting the selected plugin as the AudioProcessor in the AudioProcessorPlayer?