[Bug 673925] [API] codecparsers: add JPEG baseline parser

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=673925
  GStreamer | gst-plugins-bad | git

--- Comment #15 from Gwenole Beauchesne <gb.devel at gmail.com> 2013-09-24 14:44:19 UTC ---
I have attached 3 new patches. I could squash 2 of them (mine) and leave out
Feng's patch as is if you prefer. The gst-vaapi decoder was updated to match
the current JPEG parser API and implementation. Overall performance was also
improved by +15 to +25%.

I don't see yet any other better algorithm to scan for the next marker code,
while preserving correctness, few instruction counts, branches and memory
loads.

I am also wondering about s/GstJpegMarkerSegment/GstJpegSegment/ and add in a
const guint8 * data similarly to the MPEG-2 packet definition. But that's just
cosmetics. I don't mind either way.

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