add new Redirect::flush() model to accomodate plugin models where flush != deactivate+activate (such as AU)

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@6633 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/ardour/audio_unit.h

@@ -79,6 +79,7 @@ class AUPlugin : public ARDOUR::Plugin
 	uint32_t nth_parameter (uint32_t which, bool& ok) const;
 	void activate ();
 	void deactivate ();
+	void flush ();
 	void set_block_size (nframes_t nframes);
     
 	int connect_and_run (vector<Sample*>& bufs, uint32_t maxbuf, int32_t& in, int32_t& out, nframes_t nframes, nframes_t offset);

libs/ardour/ardour/insert.h

@@ -53,6 +53,7 @@ class Insert : public Redirect
 	virtual void run (vector<Sample *>& bufs, uint32_t nbufs, nframes_t nframes) = 0;
 	virtual void activate () {}
 	virtual void deactivate () {}
+	virtual void flush () {}
 
 	virtual int32_t can_do (int32_t in, int32_t& out) = 0;
 	virtual int32_t configure_io (int32_t magic, int32_t in, int32_t out) = 0;
@@ -114,6 +115,7 @@ class PluginInsert : public Insert
 	void silence (nframes_t nframes);
 	void activate ();
 	void deactivate ();
+	void flush ();
 
 	void set_block_size (nframes_t nframes);
 

libs/ardour/ardour/plugin.h

@@ -113,6 +113,7 @@ class Plugin : public PBD::StatefulDestructible
 	virtual uint32_t nth_parameter (uint32_t which, bool& ok) const = 0;
 	virtual void activate () = 0;
 	virtual void deactivate () = 0;
+	virtual void flush () { deactivate(); activate(); }
 	virtual void set_block_size (nframes_t nframes) = 0;
 
 	virtual int connect_and_run (vector<Sample*>& bufs, uint32_t maxbuf, int32_t& in, int32_t& out, nframes_t nframes, nframes_t offset) = 0;

libs/ardour/ardour/redirect.h

@@ -73,6 +73,7 @@ class Redirect : public IO
 	virtual void run (vector<Sample *>& ibufs, uint32_t nbufs, nframes_t nframes) = 0;
 	virtual void activate () = 0;
 	virtual void deactivate () = 0;
+	virtual void flush () = 0;
 	virtual nframes_t latency() { return 0; }
 
 	virtual void set_block_size (nframes_t nframes) {}

libs/ardour/ardour/send.h

@@ -45,6 +45,7 @@ class Send : public Redirect
 	void run (vector<Sample *> &bufs, uint32_t nbufs, nframes_t nframes);
 	void activate() {}
 	void deactivate () {}
+	void flush () {}
 
 	void set_metering (bool yn);
 

libs/ardour/audio_unit.cc

@@ -804,10 +804,16 @@ AUPlugin::activate ()
 void
 AUPlugin::deactivate ()
 {
-	unit->GlobalReset ();
+	unit->Uninitialize ();
 	initialized = false;
 }
 
+void
+AUPlugin::flush ()
+{
+	unit->GlobalReset ();
+}
+
 void
 AUPlugin::set_block_size (nframes_t nframes)
 {
@@ -822,8 +828,7 @@ AUPlugin::_set_block_size (nframes_t nframes)
 	OSErr err;
 
 	if (initialized) {
-		unit->Uninitialize ();
-		initialized = false;
+		deactivate ();
 	}
 
 	if ((err = unit->SetProperty (kAudioUnitProperty_MaximumFramesPerSlice, kAudioUnitScope_Global, 
@@ -850,8 +855,7 @@ AUPlugin::configure_io (int32_t in, int32_t out)
 		if ( (in==input_channels) && (out==output_channels) ) {
 			return 0;
 		} else {
-			unit->Uninitialize ();
-			initialized = false;
+			deactivate ();
 		}
 	}
 

libs/ardour/insert.cc

@@ -275,6 +275,14 @@ PluginInsert::deactivate ()
 	}
 }
 
+void
+PluginInsert::flush ()
+{
+	for (vector<boost::shared_ptr<Plugin> >::iterator i = _plugins.begin(); i != _plugins.end(); ++i) {
+		(*i)->flush ();
+	}
+}
+
 void
 PluginInsert::connect_and_run (vector<Sample*>& bufs, uint32_t nbufs, nframes_t nframes, nframes_t offset, bool with_auto, nframes_t now)
 {

libs/ardour/route.cc

@@ -2264,8 +2264,7 @@ Route::handle_transport_stopped (bool abort_ignored, bool did_locate, bool can_f
 		for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
 			
 			if (Config->get_plugins_stop_with_transport() && can_flush_redirects) {
-				(*i)->deactivate ();
-				(*i)->activate ();
+				(*i)->flush ();
 			} 
 			
 			(*i)->transport_stopped (now);