Re: [Jack-Devel] Console based software EQ for jack

On Thu, January 17, 2013 2:25 am, Stefan Stefanov wrote:
> Thanks for the suggestion but I have to rethink how to accomplish this.
>
> Let me describe my set-up and what I have tried till now.
> I'm using Archlinux with pure systemd.
> I wrote my custom jack.service and jackd is started at system boot:
>
> My jack.service (also discussed here a couple weeks ago):
> [Unit]
> Description=JACK
> After=sound.target
>
> [Service]
> User=stefan
> ExecStart=/usr/bin/jackd -P 85 -d alsa -P hw:2,0 -r 96000 -n 3 -p 256
> LimitMEMLOCK=infinity
> LimitRTPRIO=infinity
>
> [Install]
> WantedBy=multi-user.target
>
> My mpd.conf is configured to use jack:
> ...
> audio_output {
>        type             "jack"
>        name             "JACK Audiolab MDAC"
>        device           "hw:2,0"
>        format           "*:24_3:2"
>        mixer_type       "disabled"
> }
> ...
>
> This is my current set-up and I'm very happy with it :)
>
>
> As you can see above mpd uses hard-coded connection to jack and
> it do real connection when my mpd-client (running on another machine)
> starts playing (hit "Play" button)
>
> (1) mpd -> jackd
>
> Now, I have to include jackeq in the middle of the (1) connection. So,
> I wrote another systemd service - for jackeq:
> [Unit]
> Description=JackEQ
> Requires=jack.service
> After=jack.service
>
> [Service]
> Type=simple
> User=stefan
> ExecStart=/usr/bin/jackeq -d
>
> [Install]
> WantedBy=multi-user.target
>
> Then I start jackeq.service.
> To make the connections to jackeq I use:
>
> Music Player Daemon:left -> jackEQ:c.1-in-L
> jackEQ:c.1-out-L -> system:playback_1
> Music Player Daemon:right -> jackEQ:c.1-in-R
> jackEQ:c.1-out-R -> system:playback_2
>
>
> jack_connect Music\ Player\ Daemon:left jackEQ:c.1-in-L
> jack_connect Music\ Player\ Daemon:right jackEQ:c.1-in-R
>
> jack_connect jackEQ:c.1-out-L system:playback_1
> jack_connect jackEQ:c.1-out-R system:playback_2
>
> This way I get:
> (2) mpd -> jackeq -> jackd
>
> and I'm able to use jackeq, but only statically.
> Statically means that cannot adjust of bass and treble during playback,
> but just load values (for bass and treble) from jackeq.conf file
> located in my $HOME (same as Roland Mas suggests).
>

I'm open to suggestions on how to handle feedback for adjusting the
control values that will work for your use case.

>
> The main problem is that connection (1) is always created (from mpd I
> think)
> when the playback starts from mpd-client and I have to disconnect it
> every time before I make connection (2).
>

You should be able to tell mpd not to autoconnect to jack i/o when it
starts or conversely to connect directly to jackEQ if it is already
running.




>
>
> 2013/1/16 Patrick Shirkey <[hidden]>:
>>
>> On Wed, January 16, 2013 8:03 pm, Stefan Stefanov wrote:
>>> Hello
>>>
>>> My music server is headless (no graphical environment).
>>> I'm using mpd + JACK to play music.
>>> Now I need some software equalizer (JACK based of course), but running
>>> in daemon mode.
>>>
>>> JackEQ is the application I currently installed. It could be run in
>>> daemon mode like that:
>>> $ jackeq -d
>>>
>>> But I don't understand how to use it further more:
>>> - how to connect it (to mpd in my case) ?
>>
>> IIRC ,you can connect the channels via jack_connect
>>
>>> - how to adjust bass and treble ?
>>
>> To the best of my knowledge you are the first person who has publicly
>> expressed an interest in having this functionality. Hence it doesn't
>> exist
>> yet :-)
>>
>> I'm happy to spend some time on it if you have some ideas for how to
>> achieve it for your use case.
>>
>>
>> --
>> Patrick Shirkey
>> Boost Hardware Ltd
>> 
>> Jack-Devel mailing list
>> [hidden]
>> http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org
>


--
Patrick Shirkey
Boost Hardware Ltd

1358363449.25744_0.ltw:2,a <56795.5.12.188.139.1358363435.squirrel at boosthardware dot com>