[Bug 739693] assrender doesn't render frames into given memory area

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739693
  GStreamer | gst-plugins-base | git

--- Comment #6 from Andreas Frisch <fraxinas at opendreambox.org> 2014-11-06 15:07:54 UTC ---
so it does the copy because this gst_buffer_map operation has the flag
GST_MAP_WRITE, even though refcount=1 and writable=1
i dived through gstbuffer.c and gstmemory.c into gstminiobject.c 
it turns out that the gst_memory_lock() call in gst_memory_map() fails at this
condition in gst_mini_object_lock()
   /* access_mode must match */
        if ((state & access_mode) != access_mode)

debug output is
lock failed 0x72006800: state 00010101, access_mode 2

as a result it then allocates new memory for this buffer

a few lines down below in the log i see that the lock also fails the other way
around for a different memory

lock failed 0x709aa008: state 00010102, access_mode 1

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