[MPlayer-dev-eng] [PATCH] HRTF filter enhancements

[Yue Shi Lai]

This patch contains a few enhancements for the HRTF filter in libaf:

- Bass compensation gain corrected (which was set too low), now the
   sound should be even more transparent
- A (unified) dual axes active matrix decoder with adaptive steering
   - capable of decoding matrix surround encoded inputs, with stereo rear
   - capable of decoding matrix encoded rear center
- Purely stereo mixing without unneccessary rear filter calculations
- The decoding structure message is moved, because at the old place it
   gave incorrect messages.

I tested the filter using regular TV recordings, using again my 
Sennheiser HD 570. The spatial image appears to be very clear. This is 
also due to the active matrix decoder, which has a much better channel 
separation than the passive af_surround.

Any comments would be very helpful.
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