Re: john gibby ecasound with multiple inputs

Thanks all for the input!  To start with, I've added the "killall ecasound"
command to my scripts, and that works nicely.  I'm a bit slow figuring out
Charlie's suggestion, but am still thinking on it and should get it soon.
This idea about GPIO interface has me thinking of lots of things - like,
volume control of the PC/piano from my phone or a tablet or an external
box/knob; a push-button setting for piano/movie mode; turning on only the
needed amps depending on the mode selected; etc.

Thanks again.
John

On Sun, Jun 11, 2017 at 11:38 AM, Charles Laub <[email protected]>
wrote:

> John,
>
> One simple option would be to have an ecasound command string that has two
> inputs that are both always "on". You just mix them together into a single
> two channel chain and then do all your DSP processing after that.
>
> I have a similar problem. I also use ecasound and LADSPA for active
> loudspeaker crossovers and have written a suite of LADSPA crossover filter
> plugins for that purpose called ACDf. But I have found that LADSPA can be
> used to do other things, not just processing audio. For example I wrote a
> plugin for the Raspberry Pi that senses audio and then toggles a GPIO pin
> that is connected to a relay. This can be used to automatically turn on
> external equipment like an amplifier or whatever. I am currently re-writing
> this plugin to generalize the functionality and to make it usable on other
> Linux platforms via the userspace gpio interface. One new feature that I
> will create is a way for one input to override another, that is when input
> 2 has audio it mutes input 1. This can be done with any number of inputs in
> a hierarchy so that input 3 overrides input 2, and input 2 overrides input
> 1, etc. After the input mutexes, the input chains are all mixed together
> into a single chain that is then inspected for the presence of audio (so
> that my amps can be turned on and off automatically) and then lastly all
> the LADSPA processing done. I use an audio interface with multiple analog
> and digital inputs, and I can also stream audio over my LAN to the computer
> running my loudspeaker crossover, and I want a way to select from all these
> inputs automatically. Once I have re-written my LADSPA input monitoring
> plugin I will have that capability. I will post a note to this list when
> it's ready. In the meantime, try mixing both inputs together and see how
> that goes.
>
> -Charlie
>
>
> ------------------------------
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 11 Jun 2017 00:26:17 -0400
> From: john gibby <[email protected]>
> To: [email protected]
> Subject: [ecasound] starting ecasound at boot, in a terminal window
> Message-ID:
>     <CAPHHX=Nm9uHNFDSEgn4nacPiQD=yAuvOVnhMdZ-bOR9_uvws6Q@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi,
> Thanks for ecasound; it's a wonderful application.  I'm using it for active
> crossover DSP processing.  I'm running the latest version of AV-Linux.  I
> have one chainsetup for watching movies, and a different one for my
> Pianoteq piano application (included below).  I would like the piano
> crossover to come up automatically when I start the computer, but I want it
> to be convenient to change the chainsetup, for when we want to watch a
> movie.  So I thought it would be good to start up ecasound in interactive
> mode, with the desired chainsetup, in a terminal window to make it easy to
> stop processing and change the chainsetup.  With a good bit of trying, I
> got that to work:  I have an application autostart entry in Sessions and
> Startup, that successfully brings up ecasound in interactive mode, in a
> terminal window.  Only problem is, I still need to go to the terminal
> window and type "start".  Can I configure the command in my Session
> auto-start, or my chain-setup file, so it starts up processing on the
> selected chain-setup, without my having to type "start" in the ecasound-iam
> session?  I tried the -E "start" option, but it didn't seem to work.
>
> My autostart command is:  xfce4-terminal
> --working-directory=/home/gibbyj/Ecasound  -e cs_piano
>
> cs_piano script is:
> #!/bin/sh
> export TERM=xterm;
> export LADSPA_PATH=/usr/local/lib/ladspa:/usr/lib/ladspa;
> cd /home/gibbyj/Ecasound;
> #
> #
> ecasound -c -s:/home/gibbyj/Ecasound/crossover_3chan_piano.ecs
>
>
> The piano chainsetup file is:
> -n:crossover_3chan_piano_cs \
>           -a:pre1    -pf:./pre1.ecp  -f:f32_le,5,48000 -i:jack -o:loop,1 \
>           -a:pre2,woofer,center,rear -f:f32_le,5,48000 -i:loop,1 \
>           -a:pre2    -pf:./pre2.ecp  -o:loop,2 \
>           -a:mid,tweeter            -f:f32_le,5,48000 -i:loop,2 \
>           -a:woofer  -pf:./woofer.ecp    -chorder:1,3,0,0,0,0,0,0,0,0 \
>           -a:mid    -pf:./mid.ecp      -chorder:0,0,1,2,0,0,0,0,0,0 \
>           -a:tweeter -pf:./tweeter.ecp  -chorder:0,0,0,0,1,2,0,0,0,0 \
>           -a:center  -pf:./center_nodelay.ecp  -chorder:0,0,0,0,0,0,3,0,0,0
> \
>           -a:rear    -pf:./rear.ecp      -chorder:0,0,0,0,0,0,0,0,4,5 \
>           -a:woofer,mid,tweeter,center,rear -f:f32_le,10,48000 -o:jack \
>           -a:all -z:mixmode,sum -z:nodb -B:rtlowlatency -b:64
>
>
> Maybe I don't need to be using interactive mode;  but if I just bring up
> ecasound with the piano chainsetup, I'm not sure how to kill and restart it
> conveniently; would I use ps -A | grep ecasound and kill all the pid's in a
> script somehow?  How could I automate that in a script?  What I've been
> doing instead is just changing the autostart command and rebooting, but
> that is a pain.
> Thanks for the help!!
> John
>
>
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