basesrc: respect FIXED_CAPS flag in caps query implementation

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3590>

diff --git a/subprojects/gstreamer/libs/gst/base/gstbasesrc.c b/subprojects/gstreamer/libs/gst/base/gstbasesrc.c
index 25bd2a0..e47d145 100644 (file)
--- a/subprojects/gstreamer/libs/gst/base/gstbasesrc.c
+++ b/subprojects/gstreamer/libs/gst/base/gstbasesrc.c
@@ -1342,20 +1342,25 @@ gst_base_src_default_query (GstBaseSrc * src, GstQuery * query)
     case GST_QUERY_CAPS:
     {
       GstBaseSrcClass *bclass;
-      GstCaps *caps, *filter;
+      GstCaps *caps = NULL, *filter;
 
       bclass = GST_BASE_SRC_GET_CLASS (src);
-      if (bclass->get_caps) {
+      if (GST_PAD_IS_FIXED_CAPS (src->srcpad)) {
+        caps = gst_pad_get_current_caps (src->srcpad);
+      }
+
+      if (caps == NULL && bclass->get_caps) {
         gst_query_parse_caps (query, &filter);
-        if ((caps = bclass->get_caps (src, filter))) {
-          gst_query_set_caps_result (query, caps);
-          gst_caps_unref (caps);
-          res = TRUE;
-        } else {
-          res = FALSE;
-        }
-      } else
+        caps = bclass->get_caps (src, filter);
+      }
+
+      if (caps != NULL) {
+        res = TRUE;
+        gst_query_set_caps_result (query, caps);
+        gst_caps_unref (caps);
+      } else {
         res = FALSE;
+      }
       break;
     }
     case GST_QUERY_URI:{