Add support for Jack CV via metadata.

git-svn-id: http://svn.drobilla.net/lad/trunk/ingen@5400 a436a847-0d15-0410-975c-d299462d15a1

2 files changed, 71 insertions, 2 deletions

diff --git a/src/server/JackDriver.cpp b/src/server/JackDriver.cpp
index 9b1bf512..04a07cc6 100644
--- a/src/server/JackDriver.cpp
+++ b/src/server/JackDriver.cpp
@@ -27,6 +27,7 @@
 #endif
 #ifdef HAVE_JACK_METADATA
 #include <jack/metadata.h>
+#include "jackey.h"
 #endif
 
 #include "ingen/Configuration.hpp"
@@ -223,7 +224,8 @@ JackDriver::register_port(EnginePort& port)
 	jack_port_t* jack_port = jack_port_register(
 		_client,
 		port.graph_port()->path().substr(1).c_str(),
-		(port.graph_port()->is_a(PortType::AUDIO)
+		((port.graph_port()->is_a(PortType::AUDIO) ||
+		  port.graph_port()->is_a(PortType::CV))
 		 ? JACK_DEFAULT_AUDIO_TYPE : JACK_DEFAULT_MIDI_TYPE),
 		(port.graph_port()->is_input()
 		 ? JackPortIsInput : JackPortIsOutput),
@@ -281,7 +283,12 @@ JackDriver::port_property_internal(const jack_port_t* jport,
 #ifdef HAVE_JACK_METADATA
 	if (uri == _engine.world()->uris().lv2_name) {
 		jack_set_property(_client, jack_port_uuid(jport),
-		                  JACK_METADATA_PRETTY_NAME, value.ptr<char>(), NULL);
+		                  JACK_METADATA_PRETTY_NAME, value.ptr<char>(), "text/plain");
+	} else if (uri == _engine.world()->uris().rdf_type) {
+		if (value == _engine.world()->uris().lv2_CVPort) {
+			jack_set_property(_client, jack_port_uuid(jport),
+			                  JACKEY_SIGNAL_TYPE, "CV", "text/plain");
+		}
 	}
 #endif
 }
@@ -291,6 +298,7 @@ JackDriver::create_port(DuplexPort* graph_port)
 {
 	if (graph_port &&
 	    (graph_port->is_a(PortType::AUDIO) ||
+	     graph_port->is_a(PortType::CV) ||
 	     (graph_port->is_a(PortType::ATOM) &&
 	      graph_port->buffer_type() == _engine.world()->uris().atom_Sequence))) {
 		EnginePort* eport = new EnginePort(graph_port);
diff --git a/src/server/jackey.h b/src/server/jackey.h
new file mode 100644
index 00000000..6695f3db
--- /dev/null
+++ b/src/server/jackey.h
@@ -0,0 +1,61 @@
+/*
+  Copyright 2014 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+   The supported event types of an event port.
+
+   This is a kludge around Jack only supporting MIDI, particularly for OSC.
+   This property is a comma-separated list of event types, currently "MIDI" or
+   "OSC".  If this contains "OSC", the port may carry OSC bundles (first byte
+   '#') or OSC messages (first byte '/').  Note that the "status byte" of both
+   OSC events is not a valid MIDI status byte, so MIDI clients that check the
+   status byte will gracefully ignore OSC messages if the user makes an
+   inappropriate connection.
+*/
+#define JACKEY_EVENT_TYPES "http://jackaudio.org/metadata/event-types"
+
+/**
+   The type of an audio signal.
+
+   This property allows audio ports to be tagged with a "meaning".  The value
+   is a simple string.  Currently, the only type is "CV", for "control voltage"
+   ports.  Hosts SHOULD be take care to not treat CV ports as audibile and send
+   their output directly to speakers.  In particular, CV ports are not
+   necessarily periodic at all and may have very high DC.
+*/
+#define JACKEY_SIGNAL_TYPE "http://jackaudio.org/metadata/signal-type"
+
+/**
+   The name of the icon for the subject (typically client).
+
+   This is used for looking up icons on the system, possibly with many sizes or
+   themes.  Icons should be searched for according to the freedesktop Icon
+   Theme Specification:
+
+   http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html
+*/
+#define JACKEY_ICON_NAME "http://jackaudio.org/metadata/icon-name"
+
+/**
+   Channel designation for a port.
+
+   This allows ports to be tagged with a meaningful designation like "left",
+   "right", "lfe", etc.
+
+   The value MUST be a URI.  An extensive set of URIs for designating audio
+   channels can be found at http://lv2plug.in/ns/ext/port-groups
+*/
+#define JACKEY_DESIGNATION "http://lv2plug.in/ns/lv2core#designation"