Prototype LV2 extension for plugins to provide Midnams

3 files changed, 49 insertions, 0 deletions

diff --git a/libs/ardour/ardour/lv2_extensions.h b/libs/ardour/ardour/lv2_extensions.h
index 64fc3bc615..f38ac8122a 100644
--- a/libs/ardour/ardour/lv2_extensions.h
+++ b/libs/ardour/ardour/lv2_extensions.h
@@ -171,4 +171,42 @@ typedef struct _LV2_License_Interface {
    @}
 */
 
+/**
+   @defgroup midnam MIDI Naming
+
+   @{
+*/
+
+
+#define LV2_MIDNAM_URI "http://ardour.org/lv2/midnam"
+#define LV2_MIDNAM_PREFIX LV2_MIDNAM_URI "#"
+#define LV2_MIDNAM__interface LV2_MIDNAM_PREFIX "interface"
+#define LV2_MIDNAM__update LV2_MIDNAM_PREFIX "update"
+
+typedef void* LV2_Midnam_Handle;
+
+/** a LV2 Feature provided by the Host to the plugin */
+typedef struct {
+	/** Opaque host data */
+	LV2_Midnam_Handle handle;
+	/** Request from run() that the host should re-read the midnam */
+	void (*update)(LV2_Midnam_Handle handle);
+} LV2_Midnam;
+
+typedef struct {
+	/** query midnam document. The plugin
+	 * is expected to return an allocated
+	 * null-terminated XML text, which is
+	 * safe for the host to pass to free().
+	 *
+	 * The midnam <Model> must be unique and
+	 * specific for the given plugin-instance.
+	 */
+	char* (*midnam)(LV2_Handle instance);
+	char* (*model)(LV2_Handle instance);
+} LV2_Midnam_Interface;
+
+/**
+   @}
+*/
 #endif
diff --git a/libs/ardour/ardour/lv2_plugin.h b/libs/ardour/ardour/lv2_plugin.h
index a1e38fda32..202ddbb240 100644
--- a/libs/ardour/ardour/lv2_plugin.h
+++ b/libs/ardour/ardour/lv2_plugin.h
@@ -278,6 +278,7 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
 
 #ifdef LV2_EXTENDED
 	const LV2_Inline_Display_Interface* _display_interface;
+	const LV2_Midnam_Interface* _midname_interface;
 #endif
 
 	typedef struct {
@@ -294,6 +295,7 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
 	LV2_Feature    _def_state_feature;
 #ifdef LV2_EXTENDED
 	LV2_Feature    _queue_draw_feature;
+	LV2_Feature    _midnam_feature;
 #endif
 
 	// Options passed to plugin
@@ -321,6 +323,10 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
 #ifdef LV2_EXTENDED
 	bool has_inline_display ();
 	Plugin::Display_Image_Surface* render_inline_display (uint32_t, uint32_t);
+
+	bool has_midnam ();
+	bool read_midnam ();
+	std::string midnam_model ();
 #endif
 
 	void latency_compute_run ();
diff --git a/libs/ardour/ardour/plugin.h b/libs/ardour/ardour/plugin.h
index 612091191e..7d35ac7c2e 100644
--- a/libs/ardour/ardour/plugin.h
+++ b/libs/ardour/ardour/plugin.h
@@ -166,6 +166,11 @@ class LIBARDOUR_API Plugin : public PBD::StatefulDestructible, public Latent
 	virtual Display_Image_Surface* render_inline_display (uint32_t, uint32_t) { return NULL; }
 	PBD::Signal0<void> QueueDraw;
 
+	virtual bool has_midnam () { return false; }
+	virtual bool read_midnam () { return false; }
+	virtual std::string midnam_model () { return ""; }
+	PBD::Signal0<void> UpdateMidnam;
+
 	struct PresetRecord {
 	    PresetRecord () : valid (false) {}
 	    PresetRecord (const std::string& u, const std::string& l, bool s = true) : uri (u), label (l), user (s), valid (true)  {}