[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 #22 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
int frag = (4 << 16) | 8

> Does that mean I will have 4 fragments, each 256 bytes long?

Yes.

> 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?

You should not do this. You should always write data which is modulus "channels
* sample_size_in_bytes".

View the frag = (4 << 16) | 8 as an approximation.

Use:

SNDCTL_DSP_GETBLKSIZE

To get the real blocksize used.

--HPS

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