[gstreamer-bugs] [Bug 616237] New: Stop allocating buffers for any caps

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=616237
  GStreamer | gstreamer (core) | git

           Summary: Stop allocating buffers for any caps
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: otte at gnome.org
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


In various places - I've found GstBaseTransform's suggest feature and
gst_pad_buffer_alloc_unchecked() so far - GStreamer decides to allocate a
memory buffer as a fallback when calling the bufferalloc function failed.
This is bad for caps that require a GstBuffer subclass - such as video/x-raw-gl
and video/x-cairo. In fact, I believe gst-plugins-gl is currently broken as it
does not check buffers at all and assumes all buffers are GL buffers.
It is also not possible to work around this behavior as peer pads without
bufferalloc functions will always cause this to happen.

I'm filing this as I have no clue if and how to fix it. Currently I'm working
around this by manual checks, but that is ugly and required in a lot of places
when subclassing.

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