[Bug 730783] bytereader: Improve the performance to find start code for H.264 and H.265

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730783
  GStreamer | gstreamer (core) | git

--- Comment #5 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-05-27 13:01:28 UTC ---
(In reply to comment #0)
> This patch assumes that '0x0000' is unlikely to appear and the zeros are part
> of the start code, that is, '0x010000'.

Do you mean this can have false positive, or just that this would be the worst
case ?

> Our proposed idea is based on the assumption.
> If we quickly know whether or not there exists '0x0000' in the scanning area to
> find the start code, we can skip the scanning process for the start code.
> We thus implemented the preprocessing to know whether or not there exists
> '0x0000'.
> Because the probability of zeros to appear is low, its performance dramatically
> improved.

Can you provide profiling, best case, mid case, worst case ?

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