[Bug 251125] audio/jack: update to jack2 or add new port audio/jack2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251125

--- Comment #21 from Goran Mekić <meka at tilda.center> ---
As I don't need last two channels, I lowered the number of channels from 18 to
16, and as it is a power of two number, drastically less glitches are present,
but they still are there. Anyway, I'm struggling to understand
http://manuals.opensound.com/developer/SNDCTL_DSP_SETFRAGMENT.html, so I wonder
how FreeBSD implementation handles it. Let me give an example:

int frag = (4 << 16) | 8

Does that mean I will have 4 fragments, each 256 bytes long?
If fragment size is for example (number of channels * sample size / 2), do I
need 2 read calls to populate the data of all channels?

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