query: Add gst_query_has_context_type()

4 files changed, 37 insertions, 4 deletions

diff --git a/docs/gst/gstreamer-sections.txt b/docs/gst/gstreamer-sections.txt
index 49c31cf86..2626cf328 100644
--- a/docs/gst/gstreamer-sections.txt
+++ b/docs/gst/gstreamer-sections.txt
@@ -2376,6 +2376,7 @@ gst_query_parse_context
 gst_query_add_context_type
 gst_query_get_n_context_types
 gst_query_parse_nth_context_type
+gst_query_has_context_type
 <SUBSECTION Standard>
 GstQueryClass
 GST_QUERY
diff --git a/gst/gstquery.c b/gst/gstquery.c
index d5f296284..564e244e1 100644
--- a/gst/gstquery.c
+++ b/gst/gstquery.c
@@ -2503,7 +2503,7 @@ free_array_string (gpointer ptr)
 
 /**
  * gst_query_add_context_type:
- * @query: a GST_QUERY_NEED_CONTEXT type query
+ * @query: a GST_QUERY_CONTEXT type query
  * @context_type: a context type
  *
  * Add a new context type to @query.
@@ -2528,7 +2528,7 @@ gst_query_add_context_type (GstQuery * query, const gchar * context_type)
 
 /**
  * gst_query_get_n_context_types:
- * @query: a GST_QUERY_NEED_CONTEXT type query
+ * @query: a GST_QUERY_CONTEXT type query
  *
  * Retrieve the number of values currently stored in the
  * context-types array of the query's structure.
@@ -2552,10 +2552,10 @@ gst_query_get_n_context_types (GstQuery * query)
 
 /**
  * gst_query_parse_nth_context_type:
- * @query: a GST_QUERY_NEED_CONTEXT type query
+ * @query: a GST_QUERY_CONTEXT type query
  * @context_type: (out) (allow-none): the context type, or NULL
  *
- * Parse a context type from an existing GST_QUERY_NEED_CONTEXT query
+ * Parse a context type from an existing GST_QUERY_CONTEXT query
  * from @index.
  *
  * Returns: a #gboolean indicating if the parsing succeeded.
@@ -2580,3 +2580,33 @@ gst_query_parse_nth_context_type (GstQuery * query, guint index,
 
   return TRUE;
 }
+
+/**
+ * gst_query_has_context_type:
+ * @query: a GST_QUERY_CONTEXT type query
+ * @context_type: the context type
+ *
+ * Check if @query is asking for @context_type.
+ *
+ * Returns: %TRUE if @context_type is requested.
+ */
+gboolean
+gst_query_has_context_type (GstQuery * query, const gchar * context_type)
+{
+  guint i, n;
+
+  g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT, FALSE);
+  g_return_val_if_fail (context_type != NULL, FALSE);
+
+  n = gst_query_get_n_context_types (query);
+  for (i = 0; i < n; i++) {
+    const gchar *tmp;
+
+    if (gst_query_parse_nth_context_type (query, i, &tmp) &&
+        strcmp (tmp, context_type) == 0)
+      return TRUE;
+  }
+
+
+  return FALSE;
+}
diff --git a/gst/gstquery.h b/gst/gstquery.h
index 57a9c0622..e956a2aa6 100644
--- a/gst/gstquery.h
+++ b/gst/gstquery.h
@@ -487,6 +487,7 @@ GstQuery *      gst_query_new_context              (void) G_GNUC_MALLOC;
 void            gst_query_add_context_type         (GstQuery * query, const gchar * context_type);
 guint           gst_query_get_n_context_types      (GstQuery * query);
 gboolean        gst_query_parse_nth_context_type   (GstQuery * query, guint i, const gchar ** context_type);
+gboolean        gst_query_has_context_type         (GstQuery * query, const gchar * context_type);
 void            gst_query_set_context              (GstQuery *query, GstContext *context);
 void            gst_query_parse_context            (GstQuery *query, GstContext **context);
 
diff --git a/win32/common/libgstreamer.def b/win32/common/libgstreamer.def
index 4f89ad16c..f6e9ec447 100644
--- a/win32/common/libgstreamer.def
+++ b/win32/common/libgstreamer.def
@@ -922,6 +922,7 @@ EXPORTS
 	gst_query_get_n_scheduling_modes
 	gst_query_get_structure
 	gst_query_get_type
+	gst_query_has_context_type
 	gst_query_has_scheduling_mode
 	gst_query_has_scheduling_mode_with_flags
 	gst_query_new_accept_caps