3

I have a sound card with an AES/EBU input port that I want to access with two applications simultaneously. I want to record the input to a linear WAV file in real-time while also streaming it through IceCast. If I naively try to access the same input device with both applications one tells me that it can't access the device. How can I set up ALSA in order to accomplish this? Or do I have to relay it through some external program, introducing delays?

3

You can use the dsnoop plugin to copy the sample data to multiple virtual capture devices.

Put something like this into your ~/.asoundrc or /etc/asound.conf, and use snooped_digital as device name in both applications:

pcm.snooped_digital {
    type dsnoop
    slave {
        pcm "hw:2,1"   # the actual device
        channels 2
        rate 48000
    }
}
  • It works, but it doesn't show up on arecord -l. Do you know how to make snooped_digital show up on arecord -l? – felipeduque Oct 1 '18 at 16:26
  • @felipeduque hint.description "blah" – CL. Oct 1 '18 at 18:21

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