[Bug 746150] New: multisocketsink: Map `GstMemory`s individually when sending

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746150

            Bug ID: 746150
           Summary: multisocketsink: Map `GstMemory`s individually when
                    sending
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gnome at williammanley.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 299312
  --> https://bugzilla.gnome.org/attachment.cgi?id=299312&action=edit
multisocketsink: Map `GstMemory`s individually when sending

If a buffer is made up of non-contiguous `GstMemory`s `gst_buffer_map`
has to copy all the data into a new `GstMemory` which is contiguous.  By
mapping all the `GstMemory`s individually and then using scatter-gather
IO we avoid this situation.

This is a preparatory step for adding support to multisocketsink for
sending file descriptors, where a GstBuffer may be made up of several
`GstMemory`s, some of which are backed by a memfd or file, but I think this
patch is valid and useful on its own.

This is a pure re-factoring and shouldn't change any behaviour.

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