[ale] Squeezelite + ecasound + sox on Beaglebone Black

[Ian Forrest]

I did try the last process tip way back when, though I haven't revisited
that lately. Unfortunately, since updating Debian the script I was trying
to modify no longer works; I'll get back once I've had a chance to fiddle
with it a bit more.

On Thu, Jul 9, 2015 at 9:41 AM, Sergio Chaves <sergio.chaves at gmail.com>
wrote:

> Also, have you tried to make it the last process/service to load? Maybe
> your script is trying to start before all the other services are up and
> running?
>
> On Wed, Jul 8, 2015 at 12:37 PM, Ed Cashin <ecashin at noserose.net> wrote:
>
>> Sometimes logging in can change the owner or permission of sound-related
>> special files under /dev.
>>
>>
>> On Wed, Jul 8, 2015 at 5:40 AM LnxGnome <lnxgnome at hopnet.net> wrote:
>>
>>> On 7/8/15 12:47 AM, Ian Forrest wrote:
>>>
>>> Hey all,
>>>
>>>  I suspect that this is an easier question than I'm making it; I ran
>>> linux forever before law school, but never got too creative with it, so
>>> please forgive me if I'm missing something obvious.
>>>
>>>  I am using a Beaglebone Black running Debian as the brains of a stereo
>>> setup. I am running squeezelite (a software player for the logitech media
>>> server), piping it into ecasound for equalization and crossover filters,
>>> and finally sox for dithered re-quantization so that everything can be sent
>>> out to a dinky USB soundcard. This is all I plan on having the Beaglebone
>>> do, at least for the time being.
>>>
>>>  I have a bash script that does all this, cobbled together from a
>>> really great guide at
>>> http://rtaylor.sites.tru.ca/2013/06/25/digital-crossovereq-with-open-source-software-howto/
>>> . With a couple anonymizing modifications, it looks something like this:
>>>
>>>
>>>  #!/bin/sh
>>> /home/debian/squeezelite -o - -u vL -a ::32:0 -n Speakers -s 192.168.x.x
>>> | ecasound -q -z:mixmode,sum -x -a:pre -f:s32_le,2,44100 -i:stdin
>>> -pf:/home/debian/ecasound/pre.ecp -o:loop,1 -a:woofer,fullrange -i:loop,1
>>> -a:woofer -pf:/home/debian/ecasound/woofer.ecp -chorder:1,2,0,0
>>> -a:fullrange -pf:/home/debian/ecasound/fullrange.ecp -chorder:0,0,1,2
>>> -a:woofer,fullrange -f:f32_le,4,44100 -o:stdout | sox -q -c 4 -r 44100 -b
>>> 32 -e float -L -t raw - -e signed -c 4 -b 16 -t alsa surround40:Device
>>> dither -s
>>>
>>>  This works. ./squeezelite.sh runs and is off to the races, makes
>>> pretty noises, etc.
>>>
>>>  The problem is daemonizing it and having it run at startup. Something
>>> tells me this is due to failure to understand scripting generally and pipes
>>> specifically. For now, I have to start a putty session and run the script
>>> myself. I have yet to find a good way to get it going automatically.
>>>
>>> ...<snip>
>>>
>>> Hi Ian,
>>>
>>>   You haven't mentioned how it is failing.  Is there an error message?
>>>
>>>   Taking a WAG, this may be as simple a PATHing difference between
>>> interactive vs non-interactive users.  Try adding the full path names to  ecasound
>>> and sox.
>>>
>>>
>>> --LnxGnome
>>>
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>>
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>
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-- 
R. Ian Forrest
(404) 236-9436
J.D. 2013, University of Kentucky College of Law
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