From 6e65daa4d12df6702bb7e95e106e24f8a3da5e64 Mon Sep 17 00:00:00 2001
From: Alexander Saprykin <xelfium@gmail.com>
Date: Wed, 14 Mar 2012 20:42:56 +0400
Subject: [PATCH] Add new TOC query

---
 gst/gstquery.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++
 gst/gstquery.h | 10 +++++-
 2 files changed, 101 insertions(+), 1 deletion(-)

diff --git a/gst/gstquery.c b/gst/gstquery.c
index d9c48f8b91..53b4cf9571 100644
--- a/gst/gstquery.c
+++ b/gst/gstquery.c
@@ -101,6 +101,7 @@ static GstQueryTypeDefinition standard_definitions[] = {
   {GST_QUERY_BUFFERING, "buffering", "Buffering status", 0},
   {GST_QUERY_CUSTOM, "custom", "Custom query", 0},
   {GST_QUERY_URI, "uri", "URI of the source or sink", 0},
+  {GST_QUERY_TOC, "toc", "Full table of contents", 0},
   {GST_QUERY_NONE, NULL, NULL, 0}
 };
 
@@ -1495,3 +1496,94 @@ gst_query_parse_uri (GstQuery * query, gchar ** uri)
     *uri = g_value_dup_string (gst_structure_id_get_value (query->structure,
             GST_QUARK (URI)));
 }
+
+/**
+ * gst_query_new_toc:
+ *
+ * Constructs a new query TOC query object. Use gst_query_unref()
+ * when done with it. A TOC query is used to query the full TOC with
+ * the UID marker for TOC extending (to insert some new entries).
+ *
+ * Returns: A #GstQuery.
+ *
+ * Since: 0.10.37
+ */
+GstQuery *
+gst_query_new_toc (void)
+{
+  GstQuery *query;
+
+  query = gst_query_new (GST_QUERY_TOC, NULL);
+
+  return query;
+}
+
+/**
+ * gst_query_set_toc:
+ * @query: a #GstQuery with query type GST_QUERY_TOC.
+ * @toc: the GstToc to set.
+ * @extend_uid: UID which can be used for TOC extending (may be NULL),
+ * 0 means root TOC level.
+ *
+ * Answer a TOC query by setting appropriate #GstToc structure.
+ *
+ * Since: 0.10.37
+ */
+void
+gst_query_set_toc (GstQuery * query, GstToc * toc, const gchar * extend_uid)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (query != NULL);
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_TOC);
+  g_return_if_fail (toc != NULL);
+
+  structure = _gst_toc_to_structure (toc);
+
+  g_return_if_fail (structure != NULL);
+
+  /* that shouldn't be happen in normal usage */
+  if (query->structure != NULL)
+    gst_structure_free (query->structure);
+
+  if (extend_uid != NULL)
+    _gst_toc_structure_set_extend_uid (structure, extend_uid);
+
+  query->structure = structure;
+  gst_structure_set_parent_refcount (query->structure,
+      &(query->mini_object.refcount));
+}
+
+/**
+ * gst_query_parse_toc:
+ * @query: a #GstQuery.
+ * @toc: (out): the storage for the received TOC (may be NULL).
+ * @extend_uid: (out): the storage for the received extend UID marker (may be NULL),
+ * 0 means root TOC level.
+ *
+ * Parse a TOC query, writing the TOC into @toc as a newly
+ * allocated #GstToc and extend UID into @extend_uid, if the respective parameters
+ * are non-NULL. Use @extend_uid value to insert new entries into the TOC (@extend_uid will
+ * act as root entry for newly inserted entries).
+ * Free @toc with gst_toc_free() and @extend_uid with g_free() after usage.
+ *
+ * Since: 0.10.37
+ */
+void
+gst_query_parse_toc (GstQuery * query, GstToc ** toc, gchar ** extend_uid)
+{
+  const GstStructure *structure;
+
+  g_return_if_fail (query != NULL);
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_TOC);
+
+  structure = gst_query_get_structure (query);
+
+  g_return_if_fail (structure != NULL);
+
+  if (toc != NULL)
+    *toc = _gst_toc_from_structure (structure);
+
+  if (extend_uid != NULL)
+    *extend_uid = _gst_toc_structure_get_extend_uid (structure);
+}
diff --git a/gst/gstquery.h b/gst/gstquery.h
index 2166537ef2..9a1a0f91c2 100644
--- a/gst/gstquery.h
+++ b/gst/gstquery.h
@@ -51,6 +51,8 @@ G_BEGIN_DECLS
  * @GST_QUERY_CUSTOM: a custom application or element defined query. Since
  * 0.10.22.
  * @GST_QUERY_URI: query the URI of the source or sink. Since 0.10.22.
+ * @GST_QUERY_TOC: query the full table of contents (TOC) with the marker
+ * for an entry which can be used to extend received TOC. Since 0.10.37.
  *
  * Standard predefined Query types
  */
@@ -69,7 +71,8 @@ typedef enum {
   GST_QUERY_FORMATS,
   GST_QUERY_BUFFERING,
   GST_QUERY_CUSTOM,
-  GST_QUERY_URI
+  GST_QUERY_URI,
+  GST_QUERY_TOC
 } GstQueryType;
 
 /**
@@ -336,6 +339,11 @@ GstQuery *      gst_query_new_uri                 (void) G_GNUC_MALLOC;
 void            gst_query_parse_uri               (GstQuery *query, gchar **uri);
 void            gst_query_set_uri                 (GstQuery *query, const gchar *uri);
 
+/* TOC query */
+GstQuery *      gst_query_new_toc                 (void);
+void            gst_query_set_toc                 (GstQuery *query, GstToc *toc, const gchar *extend_uid);
+void            gst_query_parse_toc               (GstQuery *query, GstToc **toc, gchar **extend_uid);
+
 G_END_DECLS
 
 #endif /* __GST_QUERY_H__ */