taglist: add functions to create a new taglist with tags in one go

Add functions to create a new tag list and set tags in one go, which
is nice for use in combination with functions that take ownership of
the taglist, such as gst_event_new_tag() or gst_element_found_tags().

API: add gst_tag_list_new_full()
API: add gst_tag_list_new_full_valist()

docs/gst/gstreamer-sections.txt

@@ -2158,6 +2158,8 @@ gst_tag_get_description
 gst_tag_get_flag
 gst_tag_is_fixed
 gst_tag_list_new
+gst_tag_list_new_full
+gst_tag_list_new_full_valist
 gst_is_tag_list
 gst_tag_list_is_empty
 gst_tag_list_copy

gst/gsttaglist.c

@@ -534,6 +534,67 @@ gst_tag_list_new (void)
   return GST_TAG_LIST (gst_structure_id_empty_new (GST_QUARK (TAGLIST)));
 }
 
+/**
+ * gst_tag_list_new_full:
+ * @tag: tag
+ * @...: NULL-terminated list of values to set
+ *
+ * Creates a new taglist and appends the values for the given tags. It expects
+ * tag-value pairs like gst_tag_list_add(), and a NULL terminator after the
+ * last pair. The type of the values is implicit and is documented in the API
+ * reference, but can also be queried at runtime with gst_tag_get_type(). It
+ * is an error to pass a value of a type not matching the tag type into this
+ * function. The tag list will make copies of any arguments passed
+ * (e.g. strings, buffers).
+ *
+ * Returns: a new #GstTagList. Free with gst_tag_list_free() when no longer
+ *     needed.
+ *
+ * Since: 0.10.24
+ */
+/* FIXME 0.11: rename gst_tag_list_new_full to _new and _new to _new_empty */
+GstTagList *
+gst_tag_list_new_full (const gchar * tag, ...)
+{
+  GstTagList *list;
+  va_list args;
+
+  g_return_val_if_fail (tag != NULL, NULL);
+
+  list = gst_tag_list_new ();
+  va_start (args, tag);
+  gst_tag_list_add_valist (list, GST_TAG_MERGE_APPEND, tag, args);
+  va_end (args);
+
+  return list;
+}
+
+/**
+ * gst_tag_list_new_full_valist:
+ * @var_args: tag / value pairs to set
+ *
+ * Just like gst_tag_list_new_full(), only that it takes a va_list argument.
+ * Useful mostly for language bindings.
+ *
+ * Returns: a new #GstTagList. Free with gst_tag_list_free() when no longer
+ *     needed.
+ *
+ * Since: 0.10.24
+ */
+GstTagList *
+gst_tag_list_new_full_valist (va_list var_args)
+{
+  GstTagList *list;
+  const gchar *tag;
+
+  list = gst_tag_list_new ();
+
+  tag = va_arg (var_args, gchar *);
+  gst_tag_list_add_valist (list, GST_TAG_MERGE_APPEND, tag, var_args);
+
+  return list;
+}
+
 /**
  * gst_tag_list_is_empty:
  * @list: A #GstTagList.

gst/gsttaglist.h

@@ -198,6 +198,9 @@ gboolean               gst_tag_is_fixed        (const gchar * tag);
 
 /* tag lists */
 GstTagList * gst_tag_list_new               (void);
+GstTagList * gst_tag_list_new_full          (const gchar * tag, ...);
+GstTagList * gst_tag_list_new_full_valist   (va_list var_args);
+
 gboolean     gst_is_tag_list                (gconstpointer p);
 GstTagList * gst_tag_list_copy              (const GstTagList * list);
 gboolean     gst_tag_list_is_empty          (const GstTagList * list);

tests/check/gst/gsttag.c

@@ -398,6 +398,34 @@ GST_START_TEST (test_empty_tags)
 
 GST_END_TEST;
 
+GST_START_TEST (test_new_full)
+{
+  GstTagList *tags;
+  gchar *artist, *title;
+  gdouble track_gain;
+  guint track_num;
+
+  tags = gst_tag_list_new_full (GST_TAG_ARTIST, "Arty Ist",
+      GST_TAG_TRACK_NUMBER, 9, GST_TAG_TRACK_GAIN, 4.242, GST_TAG_TITLE,
+      "Title!", NULL);
+
+  fail_unless (gst_tag_list_get_string (tags, GST_TAG_ARTIST, &artist));
+  fail_unless_equals_string (artist, "Arty Ist");
+  fail_unless (gst_tag_list_get_string (tags, GST_TAG_TITLE, &title));
+  fail_unless_equals_string (title, "Title!");
+  fail_unless (gst_tag_list_get_uint (tags, GST_TAG_TRACK_NUMBER, &track_num));
+  fail_unless_equals_int (track_num, 9);
+  fail_unless (gst_tag_list_get_double (tags, GST_TAG_TRACK_GAIN, &track_gain));
+  fail_unless_equals_float (track_gain, 4.242);
+  fail_unless (tags != NULL);
+
+  gst_tag_list_free (tags);
+  g_free (artist);
+  g_free (title);
+}
+
+GST_END_TEST;
+
 static Suite *
 gst_tag_suite (void)
 {
@@ -413,6 +441,7 @@ gst_tag_suite (void)
   tcase_add_test (tc_chain, test_set_non_utf8_string);
   tcase_add_test (tc_chain, test_buffer_tags);
   tcase_add_test (tc_chain, test_empty_tags);
+  tcase_add_test (tc_chain, test_new_full);
 
   return s;
 }

win32/common/libgstreamer.def

@@ -966,6 +966,8 @@ EXPORTS
 	gst_tag_list_is_empty
 	gst_tag_list_merge
 	gst_tag_list_new
+	gst_tag_list_new_full
+	gst_tag_list_new_full_valist
 	gst_tag_list_remove_tag
 	gst_tag_merge_mode_get_type
 	gst_tag_merge_strings_with_comma