Reorganise SPA tree

Reorganise the SPA includes to make it more extensible later
Simplify the naming of the buffer and meta params

spa/include/spa/pod/event.h

@@ -0,0 +1,55 @@
+/* Simple Plugin API
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef __SPA_EVENT_H__
+#define __SPA_EVENT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <spa/pod/pod.h>
+
+#define SPA_TYPE__Event		SPA_TYPE_POD_OBJECT_BASE "Event"
+#define SPA_TYPE_EVENT_BASE	SPA_TYPE__Event ":"
+
+struct spa_event_body {
+	struct spa_pod_object_body body;
+};
+
+struct spa_event {
+	struct spa_pod pod;
+	struct spa_event_body body;
+};
+
+#define SPA_EVENT_TYPE(ev)   ((ev)->body.body.type)
+
+#define SPA_EVENT_INIT(type) (struct spa_event)				\
+	{ { sizeof(struct spa_event_body), SPA_POD_TYPE_OBJECT },	\
+	  { { 0, type } } }						\
+
+#define SPA_EVENT_INIT_COMPLEX(t,size,type,...) (t)			\
+	{ { size, SPA_POD_TYPE_OBJECT },				\
+	  { { 0, type }, __VA_ARGS__ } }				\
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* __SPA_EVENT_H__ */