[FFmpeg-soc] expand filter (alternative to pad syntax)

[Ryo Hirafuji]

I additionary fix the source ^^;
I'm sorry to post frequently.
I optimized drawing pad and renamed context structure.

-- 
Ryo Hirafuji
blog http://ledyba.ddo.jp/
dojin http://ledyba.ddo.jp/Pegasus/
web http://ledyba.hp.infoseek.co.jp/
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