[MPlayer-dev-eng] TODO

[Arpi]

Hi,

> On Tuesday 12 February 2002 11:07, Arpi wrote:
> [...]
> > URGENT:
> [...]
> > - mencoder: image cut/crop/extend filter, colorspace conversion
> >   *** Maybe SwScale can do all of these for us?
> hmm, maybe :)
the crop/extend stuff is external stuff, just affects buffer allocation, and
can be handled by varrious stride tricks.
swscale should only do colorspace conversion and scaling at single step.
afaik it already does such things :)

> [...]
> > runtime:
> > - add --enable-runtime or something (should change VERSION header and
> > enable runtime cpu detect and print banner telling users to recompile for
> > speed) - runtime cpu detection in:
> >      vo_dga.c (asm stuff may be removed and replaced by fastmemcpy?)
> the current fastmemcpy is perhaps not optimal for mem -> agp/pci copies 
> because it assumes that read/writes go over the same bus, so it simply reads 
> a few kb (they are in the L1 cache after that) and then reads them again and 
> stores them (the trick is from amd's manual not from me ...)
> if both source &  destination are in main mem then the bus will be 100% busy 
> cuz the data is read from L1 cache on the read/write pass and the accesses 
> will be sequential instead of alternating between 2 locations so its faster
> but if the destination is on an agp card than the agp bus will be idle 50% of 
> the time and the mem bus will be idle the other 50% ... pretty bad
> allthough i didnt benchmark the mem->agp variant so its just theory ...
hmm. try it, i wanna see a 2 times faster agp_memcpy() :)


A'rpi / Astral & ESP-team

--
Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu