[MPlayer-dev-eng] TODO (mplayer on PPC)

[Mike Melanson]

On Wed, 13 Feb 2002, Michael Niedermayer wrote:

> for (i)dct specific docs ... well i dunno many, mostly the different versions 
> from mplayer/ffmpeg, especially the older ones as they are more readable
> but beware, the idct is pretty sensitive to rounding errors, a few rounding 
> errors at the wrong place and ppl will turn green after a few seconds, or get 
> stripes ;)

	I have a question about DCT code in general. Is there enough
commonality between the transforms used in various algorithms to be able
to separate the transforms out into a common library (say, libdct.a)? It
seems to me that a lot of effort goes into optimizing the DCT of various
algorithms for assorted platforms and I wonder if there's a lot of
redundant effort that could be eliminated with such a library, internal to
MPlayer. I don't know nearly enough about the DCT to know one way or
another.

	Also, is there any good place to obtain DCT test vectors?

	Thanks...
--
	-Mike Melanson