[ale] Squeezelite + ecasound + sox on Beaglebone Black

[Ed Cashin]

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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