[Discuss-gnuradio] Different modulation scheme between header and payload

[Fisheep]

Hello guys,
I try to modify the ./benchmark_tx/rx.py in gnuradio-examples/digital,
wish to set different modulation scheme for header and payload.
Ex: header with dBPSK modulation
     payload with dQPSK modulation

But I face some difficulties: 
     1.)  We cannot extract arbitrary size of data for output 
     2.)  Synchronization schemes are different among modulation schemes 
          (For we need to find header first, but after we find header, 
           we have dealt the payload with wrong synchronization scheme
already)

Could someone give me some advice about how to implement it?
I am deeply appreciative.

                              Fisheep :)
           
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