1* implement A/52a downmix extensions
2* use restrict pointers where appropriate
3* reduce size of delay buffer by 50%
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5* get rid of globals in bitstream parsing
6* get rid of statics in imdct.c
7* avoid overflows, including reading the a52 stream !!!
8* make dither code faster (generate dither table in advance ?)
9* redo all bit allocation if previous frame had zero_snr_offsets
10* make dynrng work in dual-channel streams
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12* update bitstream code
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