tag: Adds GST_TAG_APPLICATION_NAME tag

Adds a new tag for representing application used to create
a media

https://bugzilla.gnome.org/show_bug.cgi?id=626027

docs/gst/gstreamer-sections.txt

@@ -2212,6 +2212,7 @@ GST_TAG_GROUPING
 GST_TAG_USER_RATING
 GST_TAG_DEVICE_MANUFACTURER
 GST_TAG_DEVICE_MODEL
+GST_TAG_APPLICATION_NAME
 GST_TAG_IMAGE_ORIENTATION
 
 gst_tag_register

gst/gsttaglist.c

@@ -353,6 +353,8 @@ _gst_tag_initialize (void)
   gst_tag_register (GST_TAG_DEVICE_MODEL, GST_TAG_FLAG_META, G_TYPE_STRING,
       _("device model"),
       _("Model of the device used to create this media"), NULL);
+  gst_tag_register (GST_TAG_APPLICATION_NAME, GST_TAG_FLAG_META, G_TYPE_STRING,
+      _("application name"), _("Application used to create the media"), NULL);
   gst_tag_register (GST_TAG_IMAGE_ORIENTATION, GST_TAG_FLAG_META, G_TYPE_STRING,
       _("image orientation"),
       _("How the image should be rotated or flipped before display"), NULL);

gst/gsttaglist.h

@@ -959,6 +959,14 @@ gboolean     gst_tag_list_get_buffer_index  (const GstTagList * list,
  * Since: 0.10.30
  */
 #define GST_TAG_DEVICE_MODEL                      "device-model"
+/**
+ * GST_TAG_APPLICATION_NAME:
+ *
+ * Name of the application used to create the media (string)
+ *
+ * Since: 0.10.31
+ */
+#define GST_TAG_APPLICATION_NAME                  "application-name"
 /**
  * GST_TAG_IMAGE_ORIENTATION:
  *