[PD] audio output AND input with the Rpi?

Thu Oct 31 09:33:29 CET 2013

Dear all,

I just took a quick look at the page on puredata.info and noticed that my
soundcard (E-mu 0404 USB) is mentioned as "apparently [working]". For
clarity's sake i think it would be good to modify the page a bit so that
it's mentioned in the working soundcards. It's fully functional as far as i
can tell (it works in duplex at 44100 Hz with one input) and has been since
the beginning on the RPi without any slowing down of the USB speed. I can
even prove it with a video (http://www.youtube.com/watch?v=NwJNeouLqgQ) !
Problem is, i don't know how to edit the page...

Cheers,

Pierre.

2013/10/31 Julian Brooks <jbeezez at gmail.com>

> Hi Chris,
>
> I think Theron's covered most of it.
>
> The Behringer 222 is on the list of working devices compiled here:
> http://puredata.info/docs/raspberry-pi
> so hopefully that one should be doable, and my memory is that Andy Farnell
> has been running Turtle Beach cards during some of his workshops - stuck in
> my mind 'cos I had a "Turtle Beach, old school" chuckle to myself.
>
> If you do get them running (or not for that matter) it'd be great if you
> added your experience to the wiki page.
>
> For some more audio rpi tips and tweaks I heartily recommend this page:
> http://wiki.linuxaudio.org/wiki/raspberrypi
> and there's some more (related) good stuff here
> http://www.raspberrypi.org/phpBB3/viewtopic.php?p=286064#p286064
>
> Plus of course there's a whole heap of stuff in the pd-list archives
> (search raspberry or rpi).
>
> Regards,
>
> Julian
>
>
> On 30 October 2013 00:58, Theron Trowbridge <theron.trowbridge at gmail.com>wrote:
>
>> There's good info on http://puredata.info/docs/raspberry-pi covering
>> this, if you haven't seen it.
>>
>> There seem to be a limited number of interfaces that work.  And some
>> people have to slow down the USB port to get clean audio (myself included,
>> using the iMic (
>> http://www.amazon.com/Griffin-Technology-iMic-Audio-Device/dp/B000BVV2IC).
>>  And I have to use a wireless keyboard/mouse if I'm not connecting via ssh (
>> http://www.amazon.com/gp/product/B004KSQANO/).  It's not ideal, and a
>> little annoying that the accessories are more than the cost of the
>> Raspberry Pi.  But it works.
>>
>> The USB port is slowed down by adding "dwc_otg.speed=1" to
>> /boot/cmdline.txt
>>
>>
>> -Theron
>> ^
>>
>>
>>
>> On Tue, Oct 29, 2013 at 12:03 AM, s p <sebpiq at gmail.com> wrote:
>>
>>> Same here ... I tried with 2 different usb interfaces, and I got no
>>> luck. In both cases I got "some" sound input, but there is a lot of popping
>>> sounds.
>>>
>>>
>>> 2013/10/28 Chris Jack <christopherdanieljack at gmail.com>
>>>
>>>>  Hey folks,
>>>>
>>>> Apologies as this post is not strictly about Pd, though Pd will be a
>>>> crucial part of my final setup so whatever solution I find ought to work
>>>> with Pd. Also, there is a chance the issue might lie with Pd. I just don't
>>>> know.
>>>>
>>>> I'm looking for a usb bus-powered audio interface for the Rpi that can
>>>> take a stereo input and provide stereo output *at the same time.*
>>>> * *
>>>> I have tried a couple different images and a couple different audio
>>>> interfaces, to no avail. Perhaps there's something can be done with one of
>>>> these setups to get it working?
>>>>
>>>> First, the Pd-LA custom Raspian (v1) image and Pd 43.2:
>>>>
>>>> ..with Behringer UCA202 (at 44100khz):
>>>>
>>>> Alsamixer picks the device up but the input section shows nothing.
>>>>
>>>> Pd (gui) audio preferences allows selection of the interface for both
>>>> input and output. Output only is lovely and clean but as soon as the device
>>>> is selected for audio input the audio quality drops horrendously (vaguely
>>>> recognisable from the original signal)..
>>>> ..although what gives me hope is I CAN software monitor the input
>>>> (poorly) in 'Test Audio and MIDI' with this arrangement.
>>>>
>>>> ..with Behringer UCA202 (at 48000khz):
>>>>
>>>> Output only in Pd is poor (beating and popping sound - possibly sounds
>>>> like a samp rate conversion issue).
>>>> When device is selected as Pd input software monitoring is possible and
>>>> oddly, though the result is still poor, there is effectively no drop in
>>>> quality from having the device selected only for output and the monitored
>>>> signal sounds drastically better than at 44100khz.
>>>>
>>>>
>>>> ..with Turtle Beach Amigo II* (at 44100):
>>>>
>>>> Alsamixer shows both input and output and allows to change gain of
>>>> both.
>>>> If plugged in from boot and only the output is selected in Pd it works
>>>> but with a lot of jitter. Selecting the device for input too causes a
>>>> further drop in audio quality although again I can software monitor the
>>>> input in 'Test Audio and MIDI'
>>>> If plugged in after boot the OS crashes.
>>>>
>>>>
>>>> The Satellite CCRMA (operating via ssh) and Pd-extended:
>>>>
>>>> ..with Behringer UCA202 (at 44100 and 48000):
>>>>
>>>> Alsamixer picks the device up but again the input section shows nothing.
>>>>
>>>> If I have the device plugged in from boot then I get the same behaviour
>>>> with it as I do in Pd vanilla on the Pd-LA Raspian image, ie. software
>>>> input monitoring but at an extremely poor quality.
>>>>
>>>> If I don't plug the device in from boot I see it in Pd audio prefs but
>>>> get this:
>>>>
>>>> ALSA input error (snd_pcm_open): No such file or directory
>>>>
>>>> ALSA output error (snd_pcm_open): No such file or directory
>>>>
>>>> from the Pd terminal and this
>>>>
>>>> ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
>>>> ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
>>>> oops: ALSA cards not reported in order?
>>>>
>>>> from the ssh terminal.
>>>>
>>>>
>>>> ..with Turtle Beach Amigo II* (at 44100khz):
>>>>
>>>> Alsamixer shows both input and output and allows to change gain of both.
>>>>
>>>> If plugged in from boot and then only output selected in Pd I get clean
>>>> audio out. If I try to select the Turtle Beach as audio inout in Pd then Pd
>>>> stalls indefinitely when I try to 'Test Audio and MIDI' or make anything in
>>>> a patch.
>>>>
>>>> Same direct input monitoring by default.
>>>>
>>>> Also get
>>>>
>>>> ALSA input error (snd_pcm_open): Device or resource busy
>>>>
>>>> ALSA output error (snd_pcm_open): Device or resource busy
>>>>
>>>> from the Pd terminal if I don't have it plugged in from boot, though no
>>>> message in ssh terminal.
>>>>
>>>> *It also appears that by default the Turtle Beach does direct input
>>>> monitoring of some sorts, the output stage sending out a clean copy of
>>>> whatever signal is going into the input stage whenever the device is
>>>> plugged into a usb port. With the Pd-LA image this occurred simultaneously
>>>> while input monitoring in Pd. I guess this is part of the design of the
>>>> Turtle Beach, though their documentation is devoid of any useful info
>>>> regards this. If this is the case then this ain't the sound card for me,
>>>> though clearly some might find this a very useful feature.
>>>>
>>>> Just to give a bit more info about what I'm attempting: I wish to run
>>>> the stereo input from the Turtle Beach through Pd, play with the audio
>>>> signal using data from an accelerometer (not nearly there yet) and then
>>>> send the audio out through the Turtle Beach's stereo output.
>>>>
>>>> Apologies for the essay. Hopefully my findings are useful for others
>>>> and hopefully I can get my rig working! Help muchly appreciated. I've
>>>> probably left out some crucial bit of info so please shout me if I have!
>>>>
>>>> Cheers,
>>>> Chris Jack.
>>>>
>>>> Chris Jack
>>>>
>>>> *art/research*
>>>> http://itsmrjack.com/
>>>>
>>>> *discus jockeying/sound art*
>>>> http://soundcloud.com/itsmrjack/
>>>>
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>>>>
>>>
>>>
>>> --
>>> *Sébastien Piquemal
>>> *
>>> *
>>> ** *-----* @sebpiq*
>>>  -----* *http://github.com/sebpiq*
>>> *
>>>  ----- http://funktion.fm
>>>
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>>
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