add file

libs/ardour/jack_api.cc

@@ -0,0 +1,106 @@
+/*
+    Copyright (C) 2013 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "ardour/jack_connection.h"
+#include "ardour/jack_audiobackend.h"
+#include "ardour/jack_portengine.h"
+
+using namespace ARDOUR;
+
+static boost::shared_ptr<JACKAudioBackend> backend;
+static boost::shared_ptr<JACKPortEngine> port_engine;
+static boost::shared_ptr<JackConnection> jack_connection;
+
+static boost::shared_ptr<AudioBackend>
+backend_factory (AudioEngine& ae)
+{
+	if (!jack_connection) {
+		return boost::shared_ptr<AudioBackend>();
+	}
+
+	if (!backend) {
+		backend.reset (new JACKAudioBackend (ae, jack_connection));
+	}
+
+	return backend;
+}
+
+static boost::shared_ptr<PortEngine>
+portengine_factory (PortManager& pm)
+{
+	if (!jack_connection) {
+		return boost::shared_ptr<PortEngine>();
+	}
+
+	if (!port_engine) {
+		port_engine.reset (new JACKPortEngine (pm, jack_connection));
+	}
+
+	return port_engine;
+}
+
+static int
+instantiate (const std::string& arg1, const std::string& arg2)
+{
+	try {
+		jack_connection.reset (new JackConnection (arg1, arg2));
+	} catch (...) {
+		std::cerr << "JC failed\n";
+		return -1;
+	}
+
+	return 0;
+}
+
+static int 
+deinstantiate ()
+{
+	port_engine.reset ();
+	backend.reset ();
+	jack_connection.reset ();
+
+	return 0;
+}
+
+static bool
+already_configured ()
+{
+	return JackConnection::server_running ();
+}
+
+extern "C" {
+	
+	
+	/* functions looked up using dlopen-and-cousins, and so naming scope
+	 * must be non-mangled.
+	 */
+
+	using namespace ARDOUR;
+
+	AudioBackendInfo descriptor = {
+		"JACK",
+		instantiate,
+		deinstantiate,
+		backend_factory,
+		portengine_factory,
+		already_configured
+	};
+
+}
+