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ALSA_LOOPBACK(1) - Linux manual page online | User commands

Loop back the first two channels of a alsa device to another device.

July 2013
zita-alsa-pcmi(1) General Commands Manual zita-alsa-pcmi(1)


alsa_loopback - loop back the first two channels of a alsa device to another device


alsa_loopback playdev captdev fsamp frsize nfrags


This tool is mainly for testing whether a given soundcard works with the zita-alsa-pcmi library. It will send the 1st two channels of the given capture device to the playback device, using the specified settings. Note, that this might give massive (ear and equipment damaging) feedback if your capture device is connected to a microphone near some speakers connected to the playback device.


playdev ALSA playback device (e.g.: hw:0) captdev ALSA capture device (e.g.: hw:0) fsamp Sample rate (e.g.: 48000) frsize Period size (e.g.: 256) nfrags Number of fragments (e.g.: 2)


This will loopback the 1st two channels of hw:0 to hw:1 using 48kHz samplerate, and 10 fragments each 2048 samples. alsa_loopback hw:0 hw:1 48000 2048 10


zita-alsa-pcmi was written by Fons Adriaensen <>. This manual page was written by IOhannes m zmoelnig <> for the Debian project (but may be used by others).
July 2013 zita-alsa-pcmi(1)
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