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Creating codecs

Started by Ryan_001 Apr 24, 2003 at 3:09 AM 5 replies 800+ views

Original Post

144

Apr 24, 2003 at 3:09 AM

In my spare time I''ve developed a few video compression / decompression routines. There are 3 of them that are of particular interest and I would like to polish them and release them for general consumption. That said I haven''t the slightest clue as to how to take my sleek C++ code, and create a Media codec. If anyone has any information whatsoever, a link, or any place that might get me started I would greatly appreciate it. I''ve searched in MSDN and all over yahoo, webcrawler, ect.. but all I get are links to how to use codecs, not how to create them.

cnstrnd

Apr 24, 2003 at 5:27 AM

May be DirectShow filter ?

CWizard

Apr 24, 2003 at 5:46 AM

I have no idea really how they are made and hooked into the system. The best way may be to find the source for other codecs and study how they''re made. A place to start looking:
http://sourceforge.net/search/?type_of_search=soft&words=codec

Michalson

177

Michalson

Apr 24, 2003 at 8:28 AM

I have done a very simple video for windows video codec (it was a long time ago, and even if I had the source I doubt it would be useful to you, since it was coded in Delphi). For reference I would suggest you lookup the Huffyuv codec. It comes with complete source, which I found helpful. Video codecs basically have a single entry procedure that takes a message id and some parameters. The various messages do things like starting compression, querying capabilities and requesting config/about windows. Just take some of the messages used in the main module of Huffyuv (it''s a big case statement) and plug them into MSDN, IIRC they where all together in a list, so if you find one you''ll find them all.

Ryan_001

Author

144

Ryan_001

Apr 24, 2003 at 3:19 PM

Thanks guys for the help. The huffyuv codec homepage is down. The link I got (straight from the huffyuv 2.1.1 codec zip) is
http://math.berkeley.edu/~benrg/huffyuv.html
but the site is down, any idea where else I can get the source? Fortunetly the sourceforge search that was supplied has a few links that look promising. I''ll give those keywords a lookup on MSDN, see what I can find. In the mean time, if anyone has any concrete links, and/or any other ideas, the help would be appreciated.