[alsa-devel] Cannot combine audio devices with more than 64 channels

[Jörg Müller]

John Rigg informed me about the port-max-option of Jack. So I tried
running the following commands:
jackd --port-max 1024 -d alsa -C madifx_record_all -P madifx_playback_all
jackd -p 1024 -d alsa -C madifx_record_all -P madifx_playback_all
jackd -p1024 -d alsa -C madifx_record_all -P madifx_playback_all

I also tried ommiting either the option of -C or of -P. But I keep
getting the same error:
jackd: ../linux/alsa/JackAlsaDriver.cpp:122: virtual int
Jack::JackAlsaDriver::Attach(): Assertion `fCaptureChannels < 256'
failed.

So does that mean jackd doesn't recognize the parameter -p 1024?


2017-01-31 20:31 GMT+01:00 John Rigg <aldev2 at jrigg.co.uk>:
> On Tue, Jan 31, 2017 at 06:18:48PM +0100, Jörg Müller wrote:
>> I applied the patch to my system and it fixed the error!
>>
>> However, I get the following error which seems to be caused by a code
>> not being able to handle more than 256 channels:
>> > wfs at wfs16:~$ jackd -R -d alsa -C madifx_record_all -P madifx_playback_all
>> > jackdmp 1.9.10
>> > Copyright 2001-2005 Paul Davis and others.
>> > Copyright 2004-2014 Grame.
>> > jackdmp comes with ABSOLUTELY NO WARRANTY
>> > This is free software, and you are welcome to redistribute it
>> > under certain conditions; see the file COPYING for details
>> > no message buffer overruns
>> > no message buffer overruns
>> > no message buffer overruns
>> > JACK server starting in realtime mode with priority 10
>> > self-connect-mode is "Don't restrict self connect requests"
>> > audio_reservation_init
>> > Acquire audio card Audio0
>> > creating alsa driver ... madifx_playback_all|madifx_record_all|1024|2|48000|0|0|nomon|swmeter|-|32bit
>> > configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
>> > ALSA: final selected sample format for capture: 32bit float little-endian
>> > ALSA: use 8 periods for capture
>> > ALSA: final selected sample format for playback: 32bit float little-endian
>> > ALSA: use 8 periods for playback
>> > jackd: ../linux/alsa/JackAlsaDriver.cpp:122: virtual int Jack::JackAlsaDriver::Attach(): Assertion `fCaptureChannels < 256' failed.
>> > Aborted (core dumped)
>>
>> What could be the problem here?
>
> jackd only allows 256 ports maximum by default. Try using -p option
> to increase it, eg. to 512:
>
> jackd -R -p512 -d alsa....etc
>
> BTW you don't need to specify -R on recent jackd versions as it's
> realtime by default (use -r if you don't want realtime).
>
> John