lv2: keep working with older versions

Provide a fallback impl. for the only new function we were using from 0.22.
Fixes #768595

2 files changed, 27 insertions, 3 deletions

diff --git a/configure.ac b/configure.ac
index 502fb2e36..573d3bdfb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2361,7 +2361,13 @@ AG_GST_CHECK_FEATURE(LADSPA, [ladspa], ladspa, [
 dnl *** LV2 ***
 translit(dnm, m, l) AM_CONDITIONAL(USE_LV2, true)
 AG_GST_CHECK_FEATURE(LV2, [lv2], lv2, [
-  PKG_CHECK_MODULES(LILV, lilv-0 >= 0.6.6, HAVE_LV2="yes", HAVE_LV2="no")
+  PKG_CHECK_MODULES(LILV, lilv-0 >= 0.22, [
+    HAVE_LV2="yes",
+    HAVE_LILV_0_22="yes"
+    AC_DEFINE(HAVE_LILV_0_22, 1, [Define if we have liblilv >= 0.22])
+  ],[
+    PKG_CHECK_MODULES(LILV, lilv-0 >= 0.16, HAVE_LV2="yes", HAVE_LV2="no")
+  ])
   AC_SUBST(LILV_CFLAGS)
   AC_SUBST(LILV_LIBS)
 ])
diff --git a/ext/lv2/gstlv2utils.c b/ext/lv2/gstlv2utils.c
index 017d449fe..577dc858f 100644
--- a/ext/lv2/gstlv2utils.c
+++ b/ext/lv2/gstlv2utils.c
@@ -272,8 +272,12 @@ gst_lv2_save_preset (GstLV2 * lv2, GstObject * obj, const gchar * name)
   GstElementFactory *factory;
   LilvState *state;
   LilvNode *bundle_dir;
+  const LilvNode *state_uri;
   LilvInstance *instance = lv2->instance;
   gboolean res;
+#ifndef HAVE_LILV_0_22
+  gchar *filepath;
+#endif
 
   factory = gst_element_get_factory ((GstElement *) obj);
   basename = g_strdup (gst_element_factory_get_metadata (factory,
@@ -313,9 +317,19 @@ gst_lv2_save_preset (GstLV2 * lv2, GstObject * obj, const gchar * name)
   lilv_world_load_bundle (world, bundle_dir);
   lilv_node_free (bundle_dir);
 
-  lilv_world_load_resource (world, lilv_state_get_uri (state));
+#ifdef HAVE_LILV_0_22
+  state_uri = lilv_state_get_uri (state);
+#else
+  filepath = g_build_filename (dir, filename, NULL);
+  state_uri = lilv_new_uri (world, filepath);
+#endif
+  lilv_world_load_resource (world, state_uri);
   g_hash_table_insert (lv2->presets, g_strdup (name),
-      lilv_node_duplicate (lilv_state_get_uri (state)));
+      lilv_node_duplicate (state_uri));
+#ifndef HAVE_LILV_0_22
+  g_free (filepath);
+  lilv_node_free ((LilvNode *) state_uri);
+#endif
 
   lilv_state_free (state);
   if (!lv2->instance) {
@@ -757,12 +771,16 @@ gst_lv2_element_class_set_metadata (GstLV2Class * lv2_class,
   }
   val = lilv_plugin_get_author_name (lv2plugin);
   if (val) {
+    // TODO: check lilv_plugin_get_author_email(lv2plugin);
     author = g_strdup (lilv_node_as_string (val));
     lilv_node_free (val);
   } else {
     author = g_strdup ("no author available");
   }
 
+  // TODO: better description from:
+  // lilv_plugin_get_author_homepage() and lilv_plugin_get_project()
+
   lv2plugin_class = lilv_plugin_get_class (lv2plugin);
   cval = lilv_plugin_class_get_label (lv2plugin_class);
   if (cval) {