From f7a670bc79ef004ec4c9169d94fbfd57f4aa9e01 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 15 Aug 2015 20:19:30 +0200
Subject: [PATCH] implement stub UnknownProcessor

---
 libs/ardour/ardour/unknown_processor.h | 14 ++++----
 libs/ardour/unknown_processor.cc       | 44 ++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 8 deletions(-)

diff --git a/libs/ardour/ardour/unknown_processor.h b/libs/ardour/ardour/unknown_processor.h
index 50234e8294..b9743c9599 100644
--- a/libs/ardour/ardour/unknown_processor.h
+++ b/libs/ardour/ardour/unknown_processor.h
@@ -43,20 +43,18 @@ class LIBARDOUR_API UnknownProcessor : public Processor
 {
 public:
 	UnknownProcessor (Session &, XMLNode const &);
+	virtual ~UnknownProcessor ();
 
-	/* These processors are hidden from view */
-	bool display_to_user () const {
-		return false;
-	}
-
-	bool can_support_io_configuration (const ChanCount &, ChanCount &) {
-		return false;
-	}
+	bool can_support_io_configuration (const ChanCount &, ChanCount &);
+	void run (BufferSet& /*bufs*/, framepos_t /*start_frame*/, framepos_t /*end_frame*/, pframes_t /*nframes*/, bool /*result_required*/);
 
 	XMLNode & state (bool);
 
 private:
 	XMLNode _state;
+	bool      have_ioconfig;
+	ChanCount *saved_input;
+	ChanCount *saved_output;
 };
 
 }
diff --git a/libs/ardour/unknown_processor.cc b/libs/ardour/unknown_processor.cc
index f6c713404f..4bf4ebeaef 100644
--- a/libs/ardour/unknown_processor.cc
+++ b/libs/ardour/unknown_processor.cc
@@ -17,6 +17,7 @@
 
 */
 
+#include "ardour/audio_buffer.h"
 #include "ardour/unknown_processor.h"
 
 #include "i18n.h"
@@ -27,11 +28,34 @@ using namespace ARDOUR;
 UnknownProcessor::UnknownProcessor (Session& s, XMLNode const & state)
 	: Processor (s, "")
 	, _state (state)
+	, have_ioconfig (false)
+	, saved_input (0)
+	, saved_output (0)
 {
 	XMLProperty const * prop = state.property (X_("name"));
 	if (prop) {
 		set_name (prop->value ());
+		_display_to_user = true;
 	}
+
+	int have_io = 0;
+	XMLNodeList kids = state.children ();
+	for (XMLNodeIterator i = kids.begin(); i != kids.end(); ++i) {
+		if ((*i)->name() == X_("ConfiguredInput")) {
+			have_io |= 1;
+			saved_input = new ChanCount(**i);
+		}
+		if ((*i)->name() == X_("ConfiguredOutput")) {
+			have_io |= 2;
+			saved_output = new ChanCount(**i);
+		}
+	}
+	have_ioconfig = (have_io == 3);
+}
+
+UnknownProcessor::~UnknownProcessor () {
+	delete saved_input;;
+	delete saved_output;
 }
 
 XMLNode &
@@ -40,3 +64,23 @@ UnknownProcessor::state (bool)
 	return *(new XMLNode (_state));
 }
 
+bool
+UnknownProcessor::can_support_io_configuration (const ChanCount &in, ChanCount & out) {
+	if (have_ioconfig && in == *saved_input) {
+		out = *saved_output;
+		return true;
+	}
+	return false;
+}
+
+void
+UnknownProcessor::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, pframes_t nframes, bool)
+{
+	if (!have_ioconfig) {
+		return;
+	}
+	// silence excess output buffers
+	for (uint32_t i = saved_input->n_audio(); i < saved_output->n_audio(); ++i) {
+		bufs.get_audio (i).silence (nframes);
+	}
+}
-- 
2.30.2