Loading/Saving of sessions containing MIDI tracks and/or busses

git-svn-id: svn://localhost/ardour2/branches/midi@667 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/ardour/buffer.h

@@ -29,6 +29,10 @@
 namespace ARDOUR {
 
 
+/* Yes, this is a bit of a mess right now.  I'll clean it up when everything
+ * using it works out.. */
+
+
 /** A buffer of recordable/playable data.
  *
  * This is a datatype-agnostic base class for all buffers (there are no
@@ -60,13 +64,17 @@ public:
 	size_t size() const { return _size; }
 
 	/** Type of this buffer.
-	 * Based on this you can cast a Buffer* to the desired type. */
+	 * Based on this you can static cast a Buffer* to the desired type. */
 	virtual Type type() const { return _type; }
 
 	/** Jack type (eg JACK_DEFAULT_AUDIO_TYPE) */
 	const char* jack_type() const { return type_to_jack_type(type()); }
 	
-	/** Separate for creating ports (before a buffer exists to call jack_type on) */
+	/** String type as saved in session XML files (eg "audio" or "midi") */
+	const char* type_string() const { return type_to_string(type()); }
+
+	/* The below static methods need to be separate from the above methods
+	 * because the conversion is needed in places where there's no Buffer */
 	static const char* type_to_jack_type(Type t) {
 		switch (t) {
 			case AUDIO: return JACK_DEFAULT_AUDIO_TYPE;
@@ -74,6 +82,24 @@ public:
 			default:    return "";
 		}
 	}
+	
+	static const char* type_to_string(Type t) {
+		switch (t) {
+			case AUDIO: return "audio";
+			case MIDI:  return "midi";
+			default:    return "unknown"; // reeeally shouldn't ever happen
+		}
+	}
+
+	/** Used for loading from XML (route default types etc) */
+	static Type type_from_string(const string& str) {
+		if (str == "audio")
+			return AUDIO;
+		else if (str == "midi")
+			return MIDI;
+		else
+			return NIL;
+	}
 
 protected:
 	Type   _type;
@@ -82,7 +108,7 @@ protected:
 };
 
 
-/* Since we only have two types, templates aren't worth it, yet.. */
+/* Inside every class with a type in it's name is a template waiting to get out... */
 
 
 /** Buffer containing 32-bit floating point (audio) data. */

libs/ardour/route.cc

@@ -20,6 +20,7 @@
 
 #include <cmath>
 #include <fstream>
+#include <cassert>
 
 #include <sigc++/bind.h>
 #include <pbd/xml++.h>
@@ -1346,6 +1347,10 @@ Route::state(bool full_state)
 		snprintf (buf, sizeof (buf), "0x%x", _flags);
 		node->add_property("flags", buf);
 	}
+	
+	// FIXME: assumes there's only audio and MIDI types
+	node->add_property("default-type", Buffer::type_to_string(_default_type));
+
 	node->add_property("active", _active?"yes":"no");
 	node->add_property("muted", _muted?"yes":"no");
 	node->add_property("soloed", _soloed?"yes":"no");
@@ -1541,6 +1546,11 @@ Route::set_state (const XMLNode& node)
 	} else {
 		_flags = Flag (0);
 	}
+	
+	if ((prop = node.property ("default-type")) != 0) {
+		_default_type = Buffer::type_from_string(prop->value());
+		assert(_default_type != Buffer::NIL);
+	}
 
 	if ((prop = node.property ("phase-invert")) != 0) {
 		set_phase_invert(prop->value()=="yes"?true:false, this);

libs/ardour/session_state.cc

@@ -74,6 +74,7 @@
 #include <ardour/slave.h>
 #include <ardour/tempo.h>
 #include <ardour/audio_track.h>
+#include <ardour/midi_track.h>
 #include <ardour/cycle_timer.h>
 #include <ardour/utils.h>
 #include <ardour/named_selection.h>
@@ -1716,8 +1717,20 @@ Session::XMLRouteFactory (const XMLNode& node)
 		return 0;
 	}
 
-	if (node.property ("diskstream") != 0 || node.property ("diskstream-id") != 0) {
-		return new AudioTrack (*this, node);
+	bool has_diskstream = (node.property ("diskstream") != 0 || node.property ("diskstream-id") != 0);
+	
+	Buffer::Type type = Buffer::AUDIO;
+	const XMLProperty* prop = node.property("default-type");
+	if (prop)
+		type = Buffer::type_from_string(prop->value());
+	
+	assert(type != Buffer::NIL);
+
+	if (has_diskstream) {
+		if (type == Buffer::AUDIO)
+			return new AudioTrack (*this, node);
+		else
+			return new MidiTrack (*this, node);
 	} else {
 		return new Route (*this, node);
 	}