Load LV2 presets using lilv state API to support presets with state.

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 69efa2eeef1135a6fcf7ce020b512b50a26b1dbd..c6c6ead47a809acdd12bb80d9dfdeff9bed03694 100644 (file)
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -962,38 +962,38 @@ LV2Plugin::find_presets()
        lilv_node_free(lv2_appliesTo);
 }
 
-bool
-LV2Plugin::load_preset(PresetRecord r)
+static void
+set_port_value(const char* port_symbol,
+               void*       user_data,
+               const void* value,
+               uint32_t    /*size*/,
+               uint32_t    type)
 {
-       std::map<std::string,uint32_t>::iterator it;
-
-       LilvNode* lv2_port   = lilv_new_uri(_world.world, LILV_NS_LV2 "port");
-       LilvNode* lv2_symbol = lilv_new_uri(_world.world, LILV_NS_LV2 "symbol");
-       LilvNode* preset     = lilv_new_uri(_world.world, r.uri.c_str());
-       LilvNode* pset_value = lilv_new_uri(_world.world, LV2_PRESETS__value);
-
-       LilvNodes* ports = lilv_world_find_nodes(_world.world, preset, lv2_port, NULL);
-       LILV_FOREACH(nodes, i, ports) {
-               const LilvNode* port   = lilv_nodes_get(ports, i);
-               const LilvNode* symbol = get_value(_world.world, port, lv2_symbol);
-               const LilvNode* value  = get_value(_world.world, port, pset_value);
-               if (value && lilv_node_is_float(value)) {
-                       it = _port_indices.find(lilv_node_as_string(symbol));
-                       if (it != _port_indices.end()) {
-                               set_parameter(it->second,lilv_node_as_float(value));
-                       }
-               }
+       LV2Plugin* self = (LV2Plugin*)user_data;
+       if (type != 0 && type != self->_uri_map.uri_to_id(LV2_ATOM__Float)) {
+               return;  // TODO: Support non-float ports
        }
-       lilv_nodes_free(ports);
 
-       lilv_node_free(pset_value);
-       lilv_node_free(preset);
-       lilv_node_free(lv2_symbol);
-       lilv_node_free(lv2_port);
+       const uint32_t port_index = self->port_index(port_symbol);
+       if (port_index != (uint32_t)-1) {
+               self->set_parameter(port_index, *(const float*)value);
+       }
+}
 
-       Plugin::load_preset(r);
+bool
+LV2Plugin::load_preset(PresetRecord r)
+{
+       LilvWorld* world = _world.world;
+       LilvNode*  pset  = lilv_new_uri(world, r.uri.c_str());
+       LilvState* state = lilv_state_new_from_world(world, _uri_map.urid_map(), pset);
 
-       return true;
+       if (state) {
+               lilv_state_restore(state, _impl->instance, set_port_value, this, 0, NULL);
+               lilv_state_free(state);
+               return true;
+       } else {
+               return false;
+       }
 }
 
 const void*