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                           zita-alsa-pcmi(1)