Tweak/optimize VST callback:

The audioMasterAutomate callback from plugin to host does include
the parameter-value.

Previously there was a redundant call
Plugin::parameter_changed_externally() -> get_parameter
-> VSTPlugin::get_parameter()   back into the plugin to query the value.

calling back into the plugin from the callback, may explain
oddities and/or crashes with some VSTs.

1 files changed, 2 insertions, 0 deletions

diff --git a/libs/ardour/ardour/vst_plugin.h b/libs/ardour/ardour/vst_plugin.h
index 00bf680217..f96b35ff4b 100644
--- a/libs/ardour/ardour/vst_plugin.h
+++ b/libs/ardour/ardour/vst_plugin.h
@@ -40,6 +40,7 @@ class PluginInsert;
 class LIBARDOUR_API VSTPlugin : public Plugin
 {
 public:
+	friend class Session;
 	VSTPlugin (AudioEngine &, Session &, VSTHandle *);
 	VSTPlugin (const VSTPlugin& other);
 	virtual ~VSTPlugin ();
@@ -99,6 +100,7 @@ public:
 
 
 protected:
+	void parameter_changed_externally (uint32_t which, float val);
 	void set_plugin (AEffect *);
 	gchar* get_chunk (bool) const;
 	int set_chunk (gchar const *, bool);