1 files changed, 60 insertions, 10 deletions

diff --git a/plugins/eg-sampler.lv2/uris.h b/plugins/eg-sampler.lv2/uris.h
index 8c8801a..6584c13 100644
--- a/plugins/eg-sampler.lv2/uris.h
+++ b/plugins/eg-sampler.lv2/uris.h
@@ -32,9 +32,10 @@
 typedef struct {
 	LV2_URID atom_Blank;
 	LV2_URID atom_Resource;
+	LV2_URID atom_eventTransfer;
 	LV2_URID eg_applySample;
-	LV2_URID eg_freeSample;
 	LV2_URID eg_file;
+	LV2_URID eg_freeSample;
 	LV2_URID midi_Event;
 	LV2_URID msg_Set;
 	LV2_URID msg_body;
@@ -44,15 +45,64 @@ typedef struct {
 static inline void
 map_sampler_uris(LV2_URID_Map* map, SamplerURIs* uris)
 {
-	uris->atom_Blank     = map->map(map->handle, NS_ATOM "Blank");
-	uris->atom_Resource  = map->map(map->handle, NS_ATOM "Resource");
-	uris->eg_applySample = map->map(map->handle, APPLY_SAMPLE_URI);
-	uris->eg_file        = map->map(map->handle, FILE_URI);
-	uris->eg_freeSample  = map->map(map->handle, FREE_SAMPLE_URI);
-	uris->midi_Event     = map->map(map->handle, MIDI_EVENT_URI);
-	uris->msg_Set        = map->map(map->handle, LV2_MESSAGE_Set);
-	uris->msg_body       = map->map(map->handle, LV2_MESSAGE_body);
-	uris->state_Path     = map->map(map->handle, LV2_STATE_PATH_URI);
+	uris->atom_Blank         = map->map(map->handle, NS_ATOM "Blank");
+	uris->atom_Resource      = map->map(map->handle, NS_ATOM "Resource");
+	uris->atom_eventTransfer = map->map(map->handle, NS_ATOM "eventTransfer");
+	uris->eg_applySample     = map->map(map->handle, APPLY_SAMPLE_URI);
+	uris->eg_file            = map->map(map->handle, FILE_URI);
+	uris->eg_freeSample      = map->map(map->handle, FREE_SAMPLE_URI);
+	uris->midi_Event         = map->map(map->handle, MIDI_EVENT_URI);
+	uris->msg_Set            = map->map(map->handle, LV2_MESSAGE_Set);
+	uris->msg_body           = map->map(map->handle, LV2_MESSAGE_body);
+	uris->state_Path         = map->map(map->handle, LV2_STATE_PATH_URI);
+}
+
+static inline bool
+is_object_type(const SamplerURIs* uris, LV2_URID type)
+{
+	return type == uris->atom_Resource
+		|| type == uris->atom_Blank;
+}
+
+static inline const LV2_Atom*
+get_msg_file_uri(const SamplerURIs*     uris,
+                 const LV2_Atom_Object* obj)
+{
+	/* Message should look like this:
+	 * [
+	 *     a msg:Set ;
+	 *     msg:body [
+	 *         eg-sampler:file <file://hal/home/me/foo.wav> ;
+	 *     ] ;
+	 * ]
+	 */
+
+	if (obj->type != uris->msg_Set) {
+		fprintf(stderr, "Ignoring unknown message type %d\n", obj->type);
+		return NULL;
+	}
+
+	/* Get body of message. */
+	const LV2_Atom_Object* body = NULL;
+	lv2_object_getv(obj, uris->msg_body, &body, 0);
+	if (!body) {
+		fprintf(stderr, "Malformed set message has no body.\n");
+		return NULL;
+	}
+	if (!is_object_type(uris, body->atom.type)) {
+		fprintf(stderr, "Malformed set message has non-object body.\n");
+		return NULL;
+	}
+
+	/* Get file URI from body. */
+	const LV2_Atom* file_uri = NULL;
+	lv2_object_getv(body, uris->eg_file, &file_uri, 0);
+	if (!file_uri) {
+		fprintf(stderr, "Ignored set message with no file URI.\n");
+		return NULL;
+	}
+
+	return file_uri;
 }
 
 #endif  /* SAMPLER_URIS_H */