There is a big difference between supporting a legacy/failed format such as Ambisonic and DVD-A. Ambisonic decoding is purely a DSP affair, but DVD-A requires hardware support in the MPEG decoder.

Now there's a thought... I wonder if M has ditched the C-Cube Ziva (5) MPEG decoder for something better? Removing the need for DVD-A would give you a wider choice of MPEG chips, and would allow choice of a decoder without the CUE bug for instance (ahem!).

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