Pure Data Audio Input Issue

[James MacDonald]

Hello all,

I've been trying to get audio into Pure Data, but I am greeted with "ALSA input error (snd_pcm_open): Device or resource busy" every time I open Pure Data. I'm running CCRMA Satellite on a Raspberry Pi 2 Model B, using an ART USB Dual Pre audio interface. When I look in alsamixer, the USB interface is shown as the default audio device, but when I press F4 to look at the capture levels, it says the device does not have any capture controls. Oddly enough, arecord -l shows that the interface can capture audio, and is listed as an audio input device in Pure Data. I have set the USB speed to 1.1. The device is sending audio out just fine. Does anyone have any ideas as to why I may not be able to get audio in, or any suggestions for getting the audio input to work properly? If needed, I can provide more information. Thank you for your time.

James

[Gavin Morris]

Try turning off audio output.

In my experience it is quite tricky to get simultaneous in and output. Search duplex on this list.

Failing that you might need a different soundcard.

I had good luck with this one:

https://www.amazon.ca/Creative-Soundblaster-Audio-System-SB1290/dp/B0044DEDC0

Got to be version 1 though - version 2 didn't work for me.

[Gavin Morris]

Also have you tried dwc_otg.speed=1

On Tuesday, 3 May 2016 01:30:22 UTC+1, James MacDonald wrote:

[Edgar J. Berdahl]

I think that feature does set the USB bus to run in 1.1-version mode.

I don't know about this particular interface. You might google around to verify if it really is supported in Linux at all.

I also saw this:
http://ubuntuforums.org/showthread.php?t=1764295

Best,

Edgar

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