Fix loading plugins expecting COM to be available

The `LoadLibrary()` call for PSPaudioware InfiniStrip would fail because
the plugin would always expect COM to be initialized. Now if loading a
VST2 or VST3 module fails, we'll initialize COM and try again before
throwing an error. This may fix #94.

CHANGELOG.md

@@ -16,6 +16,9 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ### Fixed
 
+- _PSPaudioware InifniStrip_ would fail to initialize because the plugin expects
+  the host to always be using Microsoft COM and it won't initialize it by
+  itself. InfiniStrip loads as expected now.
 - Prevent _Native Instruments' FM7_ from crashing when processing MIDI. As a
   fix, MIDI events are now deallocated later then when they normally would have
   to be.

src/wine-host/bridges/vst2.cpp

@@ -73,7 +73,15 @@ Vst2Bridge::Vst2Bridge(MainContext& main_context,
       main_context(main_context),
       plugin_handle(LoadLibrary(plugin_dll_path.c_str()), FreeLibrary),
       sockets(main_context.context, endpoint_base_dir, false) {
-    // Got to love these C APIs
+    // HACK: If the plugin library was unable to load, then there's a tiny
+    //       chance that the plugin expected the COM library to already be
+    //       initialized. I've only seen PSPaudioware's InfiniStrip do this. In
+    //       that case, we'll initialize the COM library for them and try again.
+    if (!plugin_handle) {
+        OleInitialize(nullptr);
+        plugin_handle.reset(LoadLibrary(plugin_dll_path.c_str()));
+    }
+
     if (!plugin_handle) {
         throw std::runtime_error("Could not load the Windows .dll file at '" +
                                  plugin_dll_path + "'");

src/wine-host/bridges/vst3.cpp

@@ -99,6 +99,16 @@ Vst3Bridge::Vst3Bridge(MainContext& main_context,
       sockets(main_context.context, endpoint_base_dir, false) {
     std::string error;
     module = VST3::Hosting::Win32Module::create(plugin_dll_path, error);
+
+    // HACK: If the plugin library was unable to load, then there's a tiny
+    //       chance that the plugin expected the COM library to already be
+    //       initialized. I've only seen PSPaudioware's InfiniStrip do this. In
+    //       that case, we'll initialize the COM library for them and try again.
+    if (!module) {
+        OleInitialize(nullptr);
+        module = VST3::Hosting::Win32Module::create(plugin_dll_path, error);
+    }
+
     if (!module) {
         throw std::runtime_error("Could not load the VST3 module for '" +
                                  plugin_dll_path + "': " + error);