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Layer-1 support not heavily tested .. 
I-stereo in Level-3 seems to work now, but I have to optimize it.
general optimizations in Level-3 code.
add CRC check.
no 'free format stream' support.
in layer2.c:
        step_two: fraction as pointer .. 
        process first channel 0 than channel 1
        copy channel 0 to channel 1 for: i >= jsbound

- better frame reader .. especially for layer 3 
- MPEG system stream decoder

- check again layer1 !!

- Write a special (optimized) 'single channel' decode.

- optimized dct64 for down sampling modes

- native audio support for AIX and DEC