[FFmpeg-devel] Idea about speedup of startcode search

[Loren Merritt]

On Fri, 8 Feb 2008, Thorsten Jordan wrote:

> Here one searches for 00 00 03 xx patterns, for mpeg 1/2 or h264 you
> often look for 00 00 01 xx patterns or 00 00 00 01.
>
> This can be done in a simple C loop, but gcc does a bad job and uses up
> to 7 instructions per scanned byte. On Core 2 Duo measurement shows 2.8
> instructions per byte.

Which C implementation is that? It doesn't sound like you tried 
ff_avc_find_startcode.

--Loren Merritt