diff --git a/src/meson.build b/src/meson.build
index ff27f6f73..728cd57a9 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,6 +1,9 @@
 pipewire_jack_sources = [
   'pipewire-jack.c',
+  'metadata.c',
   'ringbuffer.c',
+  'statistics.c',
+  'uuid.c',
 ]
 
 pipewire_jack_c_args = [
diff --git a/src/metadata.c b/src/metadata.c
new file mode 100644
index 000000000..472ea1448
--- /dev/null
+++ b/src/metadata.c
@@ -0,0 +1,105 @@
+/* PipeWire
+ * Copyright (C) 2018 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include <jack/metadata.h>
+
+#include <pipewire/pipewire.h>
+
+int
+jack_set_property(jack_client_t*client,
+                  jack_uuid_t subject,
+                  const char* key,
+                  const char* value,
+                  const char* type)
+{
+	pw_log_warn("not implemented");
+	return -1;
+}
+
+int
+jack_get_property(jack_uuid_t subject,
+                  const char* key,
+                  char**      value,
+                  char**      type)
+{
+	pw_log_warn("not implemented");
+	return -1;
+}
+
+void
+jack_free_description (jack_description_t* desc, int free_description_itself)
+{
+	pw_log_warn("not implemented");
+}
+
+int
+jack_get_properties (jack_uuid_t         subject,
+                     jack_description_t* desc)
+{
+	pw_log_warn("not implemented");
+	return -1;
+}
+
+int
+jack_get_all_properties (jack_description_t** descs)
+{
+	pw_log_warn("not implemented");
+	return -1;
+}
+
+int jack_remove_property (jack_client_t* client, jack_uuid_t subject, const char* key)
+{
+	pw_log_warn("not implemented");
+	return -1;
+}
+
+int jack_remove_properties (jack_client_t* client, jack_uuid_t subject)
+{
+	pw_log_warn("not implemented");
+	return -1;
+}
+
+int jack_remove_all_properties (jack_client_t* client)
+{
+	pw_log_warn("not implemented");
+	return -1;
+}
+
+int jack_set_property_change_callback (jack_client_t*             client,
+                                       JackPropertyChangeCallback callback,
+                                       void*                      arg)
+{
+	pw_log_warn("not implemented");
+	return -1;
+}
+
+const char* JACK_METADATA_PRETTY_NAME = "http://jackaudio.org/metadata/pretty-name";
+const char* JACK_METADATA_HARDWARE = "http://jackaudio.org/metadata/hardware";
+const char* JACK_METADATA_CONNECTED = "http://jackaudio.org/metadata/connected";
+const char* JACK_METADATA_PORT_GROUP = "http://jackaudio.org/metadata/port-group";
+const char* JACK_METADATA_ICON_SMALL = "http://jackaudio.org/metadata/icon-small";
+const char* JACK_METADATA_ICON_LARGE = "http://jackaudio.org/metadata/icon-large";
diff --git a/src/statistics.c b/src/statistics.c
new file mode 100644
index 000000000..06e3c089a
--- /dev/null
+++ b/src/statistics.c
@@ -0,0 +1,47 @@
+/* PipeWire
+ * Copyright (C) 2018 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include <jack/statistics.h>
+
+#include <pipewire/pipewire.h>
+
+float jack_get_max_delayed_usecs (jack_client_t *client)
+{
+	pw_log_warn("not implemented");
+	return 0.0f;
+}
+
+float jack_get_xrun_delayed_usecs (jack_client_t *client)
+{
+	pw_log_warn("not implemented");
+	return 0.0f;
+}
+
+void jack_reset_max_delayed_usecs (jack_client_t *client)
+{
+	pw_log_warn("not implemented");
+}
diff --git a/src/uuid.c b/src/uuid.c
new file mode 100644
index 000000000..893980d90
--- /dev/null
+++ b/src/uuid.c
@@ -0,0 +1,81 @@
+/* PipeWire
+ * Copyright (C) 2018 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include <jack/uuid.h>
+
+#include <pipewire/pipewire.h>
+
+jack_uuid_t jack_client_uuid_generate ()
+{
+	pw_log_warn("not implemented");
+	return 0;
+}
+
+jack_uuid_t jack_port_uuid_generate (uint32_t port_id)
+{
+	pw_log_warn("not implemented");
+	return 0;
+}
+
+uint32_t jack_uuid_to_index (jack_uuid_t id)
+{
+	pw_log_warn("not implemented");
+	return 0;
+}
+
+int  jack_uuid_compare (jack_uuid_t id1, jack_uuid_t id2)
+{
+	pw_log_warn("not implemented");
+	return 0;
+}
+
+void jack_uuid_copy (jack_uuid_t* dst, jack_uuid_t src)
+{
+	pw_log_warn("not implemented");
+}
+
+void jack_uuid_clear (jack_uuid_t*id)
+{
+	pw_log_warn("not implemented");
+}
+
+int  jack_uuid_parse (const char *buf, jack_uuid_t*id)
+{
+	pw_log_warn("not implemented");
+	return 0;
+}
+
+void jack_uuid_unparse (jack_uuid_t id, char buf[JACK_UUID_STRING_SIZE])
+{
+	pw_log_warn("not implemented");
+}
+
+int  jack_uuid_empty (jack_uuid_t id)
+{
+	pw_log_warn("not implemented");
+	return 0;
+}