[Mplayer-users] Subtitle and correct codepage

Arpi arpi at thot.banki.hu
Thu Aug 9 22:06:27 CEST 2001


> Btw. It ran 0.622s on my cel2-1066Mhz, so it shouldn't be slower than 4s
now only 0.179s :)
i did some high-level (algorithm-level) optimization...

doing edge calculation first (pass-1) and gaussian blur at second pass,
instead of calculating edges for each gauss pixel.

Nick, can you check it, if MMX can help more?
I think at least for gauss matrix multiplication can be speeded up:

            float max = 0;
            for (my = -r; my<=r; ++my){
                int ay=y+my;
                if(ay>0 && ay<height){
                    int by=r+(my+r)*w;
                    for (mx = -r; mx<=r; ++mx)
                        if(x+mx>0 && x+mx<width)

maybe by specializing for r=2 r=3 r=4.

A'rpi / Astral & ESP-team

mailto:arpi at thot.banki.hu

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