LV2 - query presets without instantiating the plugin

diff --git a/libs/ardour/ardour/lv2_plugin.h b/libs/ardour/ardour/lv2_plugin.h
index 4cb23719ae62df1fc8d7482a9649c6b160e5e52a..093d77817b7f72503a28e5526733029b945a2d97 100644 (file)
--- a/libs/ardour/ardour/lv2_plugin.h
+++ b/libs/ardour/ardour/lv2_plugin.h
@@ -281,6 +281,7 @@ public:
        static PluginInfoList* discover ();
 
        PluginPtr load (Session& session);
+       virtual std::vector<Plugin::PresetRecord> get_presets(Session& session);
        virtual bool in_category (const std::string &c) const;
        virtual bool is_instrument() const;
 

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 9c52bb255e2ae1dc3f1d7bf08879a98790e16655..fb65fc894f882867149c39d9a0f1f2fb4b1f6127 100644 (file)
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -2622,6 +2622,47 @@ LV2PluginInfo::load(Session& session)
        return PluginPtr();
 }
 
+std::vector<Plugin::PresetRecord>
+LV2PluginInfo::get_presets(Session&)
+{
+       std::vector<Plugin::PresetRecord> p;
+#ifndef NO_PLUGIN_STATE
+       const LilvPlugin* lp = NULL;
+       try {
+               PluginPtr plugin;
+               const LilvPlugins* plugins = lilv_world_get_all_plugins(_world.world);
+               LilvNode* uri = lilv_new_uri(_world.world, _plugin_uri);
+               if (!uri) { throw failed_constructor(); }
+               lp = lilv_plugins_get_by_uri(plugins, uri);
+               if (!lp) { throw failed_constructor(); }
+               lilv_node_free(uri);
+       } catch (failed_constructor& err) {
+               return p;
+       }
+       assert (lp);
+       // see LV2Plugin::find_presets
+       LilvNode* lv2_appliesTo = lilv_new_uri(_world.world, LV2_CORE__appliesTo);
+       LilvNode* pset_Preset   = lilv_new_uri(_world.world, LV2_PRESETS__Preset);
+       LilvNode* rdfs_label    = lilv_new_uri(_world.world, LILV_NS_RDFS "label");
+
+       LilvNodes* presets = lilv_plugin_get_related(lp, pset_Preset);
+       LILV_FOREACH(nodes, i, presets) {
+               const LilvNode* preset = lilv_nodes_get(presets, i);
+               lilv_world_load_resource(_world.world, preset);
+               LilvNode* name = get_value(_world.world, preset, rdfs_label);
+               if (name) {
+                       p.push_back (Plugin::PresetRecord(lilv_node_as_string(preset), lilv_node_as_string(name)));
+                       lilv_node_free(name);
+               }
+       }
+       lilv_nodes_free(presets);
+       lilv_node_free(rdfs_label);
+       lilv_node_free(pset_Preset);
+       lilv_node_free(lv2_appliesTo);
+#endif
+       return p;
+}
+
 bool
 LV2PluginInfo::in_category (const std::string &c) const
 {