buffer: Don't copy "memory" metas unconditionally

Don't copy memory metas if we only copied part of the buffer, didn't
copy memories or merged memories. In all these cases the memory
structure has changed and the memory meta becomes meaningless.

https://bugzilla.gnome.org/show_bug.cgi?id=751712

diff --git a/gst/gstbuffer.c b/gst/gstbuffer.c
index f86df33..56b190a 100644 (file)
--- a/gst/gstbuffer.c
+++ b/gst/gstbuffer.c
@@ -534,7 +534,17 @@ gst_buffer_copy_into (GstBuffer * dest, GstBuffer * src,
       GstMeta *meta = &walk->meta;
       const GstMetaInfo *info = meta->info;
 
-      if (info->transform_func) {
+      /* Don't copy memory metas if we only copied part of the buffer, didn't
+       * copy memories or merged memories. In all these cases the memory
+       * structure has changed and the memory meta becomes meaningless.
+       */
+      if ((region || !(flags & GST_BUFFER_COPY_MEMORY)
+              || (flags & GST_BUFFER_COPY_MERGE))
+          && gst_meta_api_type_has_tag (info->api, _gst_meta_tag_memory)) {
+        GST_CAT_DEBUG (GST_CAT_BUFFER,
+            "don't copy memory meta %p of API type %s", meta,
+            g_type_name (info->api));
+      } else if (info->transform_func) {
         GstMetaTransformCopy copy_data;
 
         copy_data.region = region;