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Here's something that not many people know ...

The Microsoft HDCD decoder, as well as the reverse-engineered one, only implement 2/3 aspects of HDCD, namely
1. proprietary dithering and noise shaping (this doesn't require decoding, so even non-HDCD players benefit from this)
2. peak expansion (this is the *only* thing that the Microsoft HDCD decoding does, by the way, that's why it's so easy to reverse-engineer)

So far, no software HDCD decoder implement dynamic filter switching. The author of the reverse engineered HDCD decoder wisely left the HDCD frames intact so that some future enterprising soul can decode them, but unfortunately the filter parameters are not published and not easy to reverse-engineer.

Arguably, of course, dynamically switching playback filters isn't a very good idea and of questionable benefit. Also, I doubt any recent HDCDs were recorded using the proprietary HDCD ADC which uses dynamic filters.

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