Re: [mpg123-devel] fixed point decoders

[Taihei M. <tm...@ma...>]

I made a quick comparison between mpg123 and MAD. The RMS error of the  
compliance bitstreams and the decoding speed of our benchmark set were  
measured. Both use asm optimization for intel processors. Here is a  
result:
http://tmkk.hp.infoseek.co.jp/mpg123_mad.png

Generally our decoder is performing very nice, on both accuracy and  
speed. Note that the 16-bit outputs of MAD seem to be suffered from  
the rounding issue we had before. With proper rounding (or 24-bit  
output) they will be fully compliant, at least for "accuracy" and  
"default" settings.

Anyway, our fixed point decoders are now accurate and fast (on x86)  
enough. Remaining task will be an optimization for other platforms  
like ARM (I need iPod touch, hehe)...

Thanks,
Taihei Monma