winegstreamer: Handle allocation query in a separate helper.

dlls/winegstreamer/wg_transform.c

@@ -125,16 +125,8 @@ static gboolean transform_src_query_cb(GstPad *pad, GstObject *parent, GstQuery
     }
 }
 
-static gboolean transform_sink_query_cb(GstPad *pad, GstObject *parent, GstQuery *query)
+static gboolean transform_sink_query_allocation(struct wg_transform *transform, GstQuery *query)
 {
-    struct wg_transform *transform = gst_pad_get_element_private(pad);
-
-    GST_LOG("transform %p, type \"%s\".", transform, gst_query_type_get_name(query->type));
-
-    switch (query->type)
-    {
-        case GST_QUERY_ALLOCATION:
-        {
     gsize plane_align = transform->attrs.output_plane_align;
     GstStructure *config, *params;
     GstVideoAlignment align;
@@ -145,11 +137,11 @@ static gboolean transform_sink_query_cb(GstPad *pad, GstObject *parent, GstQuery
 
     gst_query_parse_allocation(query, &caps, &needs_pool);
     if (stream_type_from_caps(caps) != GST_STREAM_TYPE_VIDEO || !needs_pool)
-                break;
+        return false;
 
     if (!gst_video_info_from_caps(&info, caps)
             || !(pool = gst_video_buffer_pool_new()))
-                break;
+        return false;
 
     align_video_info_planes(plane_align, &info, &align);
 
@@ -191,8 +183,20 @@ static gboolean transform_sink_query_cb(GstPad *pad, GstObject *parent, GstQuery
 
     g_object_unref(pool);
     return true;
-        }
+}
+
+static gboolean transform_sink_query_cb(GstPad *pad, GstObject *parent, GstQuery *query)
+{
+    struct wg_transform *transform = gst_pad_get_element_private(pad);
+
+    GST_LOG("transform %p, type \"%s\".", transform, gst_query_type_get_name(query->type));
 
+    switch (query->type)
+    {
+        case GST_QUERY_ALLOCATION:
+            if (transform_sink_query_allocation(transform, query))
+                return true;
+            break;
         case GST_QUERY_CAPS:
         {
             GstCaps *caps, *filter, *temp;