[Bug 767350] jpegdec: Internal parser map/unmap the same buffer multiple time

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767350

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Looking at pngdec, what they do there is map from the adapter (which merges)
the accumulated size and use a ByteReader to actually parse. This makes sense,
since fist thing we do with the buffer in handle_frame() is to map it entirely,
which will result in a merge anyway. Though, one could argue that we could
implement a per Memory streaming to jpeg library instead, and that would be
slightly faster,

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