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* finalize the API:
- which PCM output format (s24,s32,float...) ?
- any special needs for the extensions ?
* implement missing features:
- check output gain! I couldn't find anything in the spec about this so
right now I'm assuming the output of the 32 subbands QMF is supposed to
be in 16 bits/sample form but this seems very dubious.
- fix downmix (user proper channes coefs, move downmix before QMF)
- sum/difference audio channels
- joint channels coding
- dynamic range
- dialog normalization
- check audio output accuracy (right now the main issue is the output gain)
- extensions (96k, extra channels)
* optimize:
- don't use doubles everywhere
- integerize everything ? (main difficulty should be the QMF and LFE FIR)
- faster 32 subbands QMF
* reliability:
- make the parser more tolerant to faulty bitstreams
- more sanity checks
- crc checks
- regressions tests
* code cleanup
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