Coming from the host-development side (which we do with a small handful
of our products, Rax in particular), I can tell you that we HAVE tried
this and researched it, and our roadblock in the end is the AUHAL
If you really care about high-quality output I'm surprised that you are
leaving float->int conversion to AUHAL or the audio drivers. Nothing against
AUHAL, just that trusting the OS to do this doesn't seem like the right
approach if you care about a well defined audio pathway.
I would do the ffloat -> int conversion in the host and use a hardware
supported bit depth at the interface to AUHAL. That way you have full
control over dithering algorithms etc.
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