klv: add klv library, klvinject and klvinspect elements

Create as a separate library until gst-plugins-base MR124 is merged into tag

gst-libs/klv/klv.h

@@ -0,0 +1,89 @@
+/* GStreamer KLV Metadata Support Library
+ * Copyright (C) 2016-2019 Tim-Philipp Müller <tim@centricular.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 __GST_TAG_KLV_H__
+#define __GST_TAG_KLV_H__
+
+#include <gst/gst.h>
+
+// FIXME: include this for now until gst-plugins-base MR124 is accepted
+//#define GST_API_EXPORT __declspec(dllexport) extern
+//#define GST_TAG_API GST_API_EXPORT
+#ifdef BUILDING_GST_KLV
+#define GST_KLV_API __declspec(dllexport) extern
+#else
+#define GST_KLV_API __declspec(dllimport) extern
+#endif
+#define GST_TAG_API GST_KLV_API
+
+G_BEGIN_DECLS
+
+/**
+ * GstKLVMeta:
+ *
+ * An opaque #GstMeta structure representing a self-contained KLV metadata
+ * block that can be attached to buffers.
+ *
+ * Since: 1.16
+ */
+typedef struct {
+  /*< private >*/
+  GstMeta meta;
+} GstKLVMeta;
+
+GST_TAG_API
+GType               gst_klv_meta_get_type (void);
+
+#define GST_KLV_META_API_TYPE  (gst_klv_meta_api_get_type())
+#define GST_KLV_META_INFO      (gst_klv_meta_get_info())
+
+GST_TAG_API
+GType               gst_klv_meta_api_get_type (void);
+
+GST_TAG_API
+const GstMetaInfo * gst_klv_meta_get_info (void);
+
+/* Add KLV meta data to a buffer */
+
+GST_TAG_API
+GstKLVMeta        * gst_buffer_add_klv_meta_from_data (GstBuffer * buffer, const guint8 * data, gsize size);
+
+GST_TAG_API
+GstKLVMeta        * gst_buffer_add_klv_meta_take_data (GstBuffer * buffer, guint8 * data, gsize size);
+
+GST_TAG_API
+GstKLVMeta        * gst_buffer_add_klv_meta_from_bytes (GstBuffer * buffer, GBytes * bytes);
+
+GST_TAG_API
+GstKLVMeta        * gst_buffer_add_klv_meta_take_bytes (GstBuffer * buffer, GBytes * bytes);
+
+/* Get KLV meta data from a buffer */
+
+GST_TAG_API
+GstKLVMeta        * gst_buffer_get_klv_meta (GstBuffer * buffer);
+
+GST_TAG_API
+const guint8      * gst_klv_meta_get_data (GstKLVMeta * klv_meta, gsize * size);
+
+GST_TAG_API
+GBytes            * gst_klv_meta_get_bytes (GstKLVMeta * klv_meta);
+
+G_END_DECLS
+
+#endif /* __GST_TAG_KLV_H__ */