[Speex-dev] Fixed-point AGC, snapshot

[Thorvald Natvig]

Hi,

Sorry for this being late. Anyway, this has an AGC that works in fixed 
point. The calculation of the gain is changed slightly even in floating 
point, as loudness_accum is no longer pow()'d, which affects the initial 
frames slightly. It gives results in fixed point, but no extensive 
verification has been done, and many of the _ctl functions still do not 
work, as they need to convert back and forth to decibel scale. I think 
perhaps the best solution there is to have the state struct store the 
decibel value as is done for noise suppression levels etc.

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