[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 #51 from Florian Walpen <dev at submerge.ch> ---
(In reply to Goran Mekić from comment #50)

For testing I would just replace the SNDCTL_DSP_SETFRAGMENT ioctl with
SNDCTL_DSP_SETBLKSIZE using fInputBufferSize as parameter. You can see in the
jack output whether the fragment size is set to the requested 512 * 18 * 4 or
rounded to a different size. If it is the requested size, test again for
glitches, otherwise I don't see any use in it.

For an actual FreeBSD-specific implementation we could maybe:
1. Set SNDCTL_DSP_SETBLKSIZE
2. Check the result with SNDCTL_DSP_GETBLKSIZE
3. If not the requested size, use SNDCTL_DSP_SETFRAGMENT with 4 or 8 fragments

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