On Wed, 04 May 2005 18:15:52 +0200
Rudolf Marek <[EMAIL PROTECTED]> wrote:
[all non-technical topics left out, to not start a flamewar ;) ]
> > Actualy it would be better if we could load any decoding system
> > into the core. But therefore we need freely available bitstream
> > generators.
>
> Best would be iDCT.
DCT doesn't give any performance boost. The time needed to
transfere the data over the PCI/PCI-E bus could be as well
used to decode the whole stream. It's also not that the DCT
is that much computation intensive, at least not for CPUs
over 1GHz [1]. What would be interesting is to implement parts
of a wavelet transform on an FPGA to get some of the currently
developing wavelet codecs into a range where they could run
on a 1GHz CPU.
Attila Kinali
[1] The reason is, that for low res movies you do not
care as they don't use up any CPU time anyways. With
high res movies you do not care because the time needed
to transfere the data (CPU <-> RAM, RAM -> graphics card)
is much higher then the time spend on the DCT.
--
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