Re: [Ipodlinux-devel] status update 17.02.03

[<arm...@ya...>]

Hi Bernard,

If the ipp code is structured in a way that would allow it, the best
split between cpus for mp3 decoding might be to have the co-processor
do subband synthesis and audio output and have the main cpu do
everything else.

(Subband synthesis is the final step in mp3 decoding, to transform
uncompressed frequency domain data to uncompressed time domain data.
It should be fairly well de-coupled from the rest of the decoder).

This is going back towards a system where the cop runs only the audio
output driver, except that now the audio output driver contains the
final stage of the mp3 decoding (which just happens to require approx
50 % of the cpu bandwidth). If fast SRAM is big enough to hold the
synthesis code + synthesis working buffer + some buffered audio data
on its way to the DAC, then you should get almost double the
throughput of a single cpu.

Andre
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