codec2json: Add h2642json element

This element convert H.264 frame header into human readable
json data.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3865>

subprojects/gst-plugins-bad/docs/plugins/gst_plugins_cache.json

@@ -6751,6 +6751,31 @@
                 },
                 "rank": "none"
             },
+            "h2642json": {
+                "author": "Benjamin Gaignard <benjamin.gaignard@collabora.com>",
+                "description": "H264 to json element",
+                "hierarchy": [
+                    "GstH2642json",
+                    "GstElement",
+                    "GstObject",
+                    "GInitiallyUnowned",
+                    "GObject"
+                ],
+                "klass": "Transform",
+                "pad-templates": {
+                    "sink": {
+                        "caps": "video/x-h264:\n",
+                        "direction": "sink",
+                        "presence": "always"
+                    },
+                    "src": {
+                        "caps": "text/x-json:\n         format: h264\n",
+                        "direction": "src",
+                        "presence": "always"
+                    }
+                },
+                "rank": "none"
+            },
             "vp82json": {
                 "author": "Benjamin Gaignard <benjamin.gaignard@collabora.com>",
                 "description": "VP8 to json element",

subprojects/gst-plugins-bad/ext/codec2json/gsth2642json.h

@@ -0,0 +1,33 @@
+/* GStreamer
+ * Copyright (C) 2023 Benjamin Gaignard <benjamin.gaignard@collabora.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_H264_2_JSON_H__
+#define __GST_H264_2_JSON_H__
+
+#include <gst/codecparsers/gsth264parser.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_H264_2_JSON (gst_h264_2_json_get_type())
+G_DECLARE_FINAL_TYPE (GstH2642json,
+    gst_h264_2_json, GST, H264_2_JSON, GstElement);
+
+G_END_DECLS
+
+#endif /* __GST_H264_2_TXT_H__ */

subprojects/gst-plugins-bad/ext/codec2json/meson.build

@@ -1,5 +1,6 @@
 codec2json_sources = files([
   'gstav12json.c',
+  'gsth2642json.c',
   'gstvp82json.c',
   'plugin.c',
 ])

subprojects/gst-plugins-bad/ext/codec2json/plugin.c

@@ -31,6 +31,7 @@
 #endif
 
 #include "gstav12json.h"
+#include "gsth2642json.h"
 #include "gstvp82json.h"
 
 static gboolean
@@ -44,6 +45,10 @@ plugin_init (GstPlugin * plugin)
           GST_TYPE_AV1_2_JSON))
     return FALSE;
 
+  if (!gst_element_register (plugin, "h2642json", GST_RANK_NONE,
+          GST_TYPE_H264_2_JSON))
+    return FALSE;
+
   return TRUE;
 }