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radeon/uvd: try to fix VC-1 decoding
The DPB size calculations seem to be off; there is various random
corruption happening, even with advanced profile. Always assuming
a minimum number of references appears to fix it, similarly to
H.264. This might overallocate the DPB. Also clean up the SPS/PPS
field setup so that it matches VC-1 specifications better.
With these changes, all advanced profile VC-1 files I could get my
hand on work fine.
Reviewed-by: Christian König <christian.koenig@amd.com>