miniobject: free qdata array when the last qdata is removed

In cases with many long-lived buffers that have qdata only very
briefly, the memory overhead of keeping an array of 16 GstQData
structs for each buffer can be significant. We free the array when
the last qdata is removed, like it was done in 1.14.

Fixes #436

diff --git a/gst/gstminiobject.c b/gst/gstminiobject.c
index b55ff58..d5c28ba 100644 (file)
--- a/gst/gstminiobject.c
+++ b/gst/gstminiobject.c
@@ -506,7 +506,12 @@ remove_notify (GstMiniObject * object, gint index)
 
   /* remove item */
   priv_data->n_qdata--;
-  if (index != priv_data->n_qdata) {
+  if (priv_data->n_qdata == 0) {
+    /* we don't shrink but free when everything is gone */
+    g_free (priv_data->qdata);
+    priv_data->qdata = NULL;
+    priv_data->n_qdata_len = 0;
+  } else if (index != priv_data->n_qdata) {
     QDATA (priv_data, index) = QDATA (priv_data, priv_data->n_qdata);
   }
 }