2007/1/29, Krischan Keitsch <[EMAIL PROTECTED]>:
Hi
as far as I can tell the n800 with the OMAP2420 processor has a vfp (vector
floating point unit; see [1] ) Based on this I wanted to find out if vorbis
could take advantage of this unit by default.
To make it short: Yes it works - BUT it is just painful!
[...]
Conclusion:
It works but the cpu load is high. Vorbis decoding takes almost 80% cpu. I
also tried MPlayer 1.0rc1-maemo.8 which has the integer based Tremor decoder
codec [4] nicely integrated. Tremor needs around 12% cpu for the same ogg
file. (That is an expected scale up from the 770 experience - tremor takes
around 20% cpu on the 770 - due to the faster cpu of the n800)
It exceeds my skills to analyze this much further. However it seems that the
vorbis decoder is not vfp optimized ;-) [yet?].
Did you specify any compiler flags or just compile as-is?
I'm not 100% sure but I've let myself belive (based on comments on the
IRC channel) that it won't compile with vfp unless you specify
"-mfpu=vfp -mfloat-abi=softfp" for the compiler. Also based on the
chatting on #maemo, "-mcpu=arm1136j-s" might be worth it.
--
Kalle Vahlman, [EMAIL PROTECTED]
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