[MPlayer-dev-eng] [PATCH] HRTF matrix decoder enhancements

[Yue Shi Lai]

Attached is a patch to enhance the matrix decoder in HRTF filter with 
two features:

- a passive locking mechanism to enable the matrix to switch between 
active and passive mode, which enhances the stereo image.

- a center front cancellation algorithm that damps the cross-talk if the 
sound is coming predominantly from center (e.g. if there is dialogue).

These two new features should enhance the quality of surround downmix 
noticeably.

Also a correction to the active gain control is included. The previous 
implementation of Lt + Rt/Lt - Rt AGC should be fine in most cases, but 
the calculation was inconsistent (gain unitarity is not guaranteed to be 
preserved).
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