Man pages sections > man1 > alsa_loopback

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

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

NAME

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

SYNOPSIS

alsa_loopback playdev captdev fsamp frsize nfrags

DESCRIPTION

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.

ARGUMENTS

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)

EXAMPLES

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

AUTHOR

zita-alsa-pcmi was written by Fons Adriaensen <fons@linuxaudio.org>.
This manual page was written by IOhannes m zmoelnig <zmoelnig@iem.at> for the Debian project (but may be used by others).
July 2013 Debian Sid