[Bug 774959] New: rtpbuffer: fix ensure_buffers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774959

            Bug ID: 774959
           Summary: rtpbuffer: fix ensure_buffers
    Classification: Platform
           Product: GStreamer
           Version: 1.8.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mparisdiaz at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 340638
  --> https://bugzilla.gnome.org/attachment.cgi?id=340638&action=edit
rtpbuffer: fix ensure_buffers

I have noticed that when gst_rtp_buffer_add_extension_onebyte_header is used
over a GstRtpBuffer that only contains a memory for the whole packet,
ensure_buffers function crashes at the next point:

mem = gst_memory_copy (rtp->map[i].memory, offset, rtp->size[i]);

when i==2 because the payload is not mapped.

In addition the offset is calculated subtracting in the wrong direction.

The attached patch fixes these issues.

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