[Jack-Devel] What functions are missing if ALSA cannot memmap?

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Date	Wed, 13 Feb 2019 21:48:45 -0600
From	Chris Caudle <[hidden] at chriscaudle dot org>
To	[hidden] at lists dot jackaudio dot org

I am helping check out a new ALSA driver, and it seems that jackd is not
happy with the capabilities this driver provides:

configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: mmap-based access is not possible for the capture stream of this
audio interface
ALSA: cannot configure capture channel

Not just capture:
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: mmap-based access is not possible for the playback stream of this
audio interface
ALSA: cannot configure playback channel

I am not very familiar yet with low level ALSA drivers, any tips where I
should look to see what the driver messed up? Is mmap access usually a
requirement for ALSA drivers?  Is it technically optional but highly
recommended, or it is required and this driver is just incomplete?

-- 
Chris Caudle

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