[Bug 746544] New: basetransform: Add buffer list support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746544

            Bug ID: 746544
           Summary: basetransform: Add buffer list support
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently basetransform has no buffer list support at all. At least for
elements that don't do much, like capsfilter and identity, this would be really
useful to have. OTOH for elements that do actual processing, it can reduce
latency to split the buffer list into separate buffers and even can make the
difference between buffers arriving in time or too late inside the sink.


I would propose to add a transform_list() and transform_list_ip() vfunc to
basetransform for this, and let the default do what is happening right now
already. And inside identity and capsfilter it just passes through the list.

Thoughts?

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