Make MIDI output actually work

distrho/src/DistrhoPlugin.cpp

@@ -102,10 +102,9 @@ void Plugin::setLatency(uint32_t frames) noexcept
 #endif
 
 #if DISTRHO_PLUGIN_WANT_MIDI_OUTPUT
-bool Plugin::writeMidiEvent(const MidiEvent& /*midiEvent*/) noexcept
+bool Plugin::writeMidiEvent(const MidiEvent& midiEvent) noexcept
 {
-    // TODO
-    return false;
+    return pData->writeMidiCallback(midiEvent);
 }
 #endif
 

distrho/src/DistrhoPluginInternal.hpp

@@ -161,11 +161,15 @@ struct Plugin::PrivateData {
 #endif
     }
 
-    void writeMidiCallback(const MidiEvent& midiEvent)
+#if DISTRHO_PLUGIN_WANT_MIDI_OUTPUT
+    bool writeMidiCallback(const MidiEvent& midiEvent)
     {
         if (writeMidiCallbackFunc != nullptr)
-            writeMidiCallbackFunc(callbacksPtr, midiEvent);
+            return writeMidiCallbackFunc(callbacksPtr, midiEvent);
+
+        return false;
     }
+#endif
 };
 
 // -----------------------------------------------------------------------

distrho/src/DistrhoPluginJack.cpp

@@ -345,6 +345,7 @@ protected:
 
 #if DISTRHO_PLUGIN_WANT_MIDI_OUTPUT
         fPortMidiOutBuffer = jack_port_get_buffer(fPortMidiOut, nframes);
+        jack_midi_clear_buffer(fPortMidiOutBuffer);
 #endif
 
         if (const uint32_t eventCount = jack_midi_get_event_count(midiBuf))