[Bug 736252] gdkpixbufdec: packetized mode logic

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=736252

--- Comment #24 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Yes, I'll do that today. I notice a huge performance regression with:

  v4l2src io-mode=dmabuf ! jpegdec ! fakesink

It was caused by the parser in there being badly implemented. For each buffer,
it will map/unmap hundreds of time (through calling the scan function), which
endup using a full CPU (since map/unmap in this case actually map the dmabuf).
But then Olivier made me realized it shouldn't be parsing for this case, since
we know that the stream from V4L2 is packetized already. That's how we found
it. I'll file a bug for the parser later.

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