[Bug 774959] rtpbuffer: fix ensure_buffers

[GStreamer (GNOME Bugzilla)]

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

Sebastian Dröge (slomo) <slomo at coaxion.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
commit 036bdf5d2d44facdcf4116ac90d3df29cbd96b8d
Author: Miguel Paris <mparisparis at gmail.com>
Date:   Fri Nov 25 10:48:06 2016 +0100

    rtpbuffer: Fix ensure_buffers() if whole packet is in one GstMemory

    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.

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

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