[Bug 750241] New: [API] GstBaseSrc: add create_list() vfunc for buffer list creation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750241

            Bug ID: 750241
           Summary: [API] GstBaseSrc: add create_list() vfunc for buffer
                    list creation
    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: t.i.m at zen.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 304380
  --> https://bugzilla.gnome.org/attachment.cgi?id=304380&action=edit
WIP: basesrc: factor out do_sync and clock status

For packet-based transports (UDP) or formats (RTP) every packet needs to be in
a separate buffer, but for high-bitrate streams the overhead of pushing
possibly up to a hundred thousand single buffers individually through the
pipeline gets very high. GStreamer provides a solution to this in form of
GstBufferList and gst_pad_push_list(), but there is currently no way to create
a buffer list in a GstBaseSrc-derived element.

The following patches add this functionality. They are still work-in-progress.

One thing I would like to see supported is the ability to have a sub class
decide whether to produce a buffer list or single buffers at run-time (e.g.
based on configuration or such).

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