.TH zita-alsa-pcmi "1" "July 2013"
.SH NAME
alsa_loopback \- loop back the first two channels of a alsa device to another device
.SH SYNOPSIS
.B alsa_loopback
.RI playdev
.RI captdev
.RI fsamp
.RI frsize
.RI nfrags
.SH DESCRIPTION
This tool is mainly for testing whether a given soundcard works with the
.BR zita-alsa-pcmi
library.
It will send the 1st two channels of the given capture device
to the playback device, using the specified settings.
.PP
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.
.SH ARGUMENTS
.TP
\fBplaydev\fR
ALSA playback device (e.g.: hw:0)
.TP
\fBcaptdev\fR
ALSA capture device (e.g.: hw:0)
.TP
\fBfsamp\fR
Sample rate (e.g.: 48000)
.TP
\fBfrsize\fR
Period size (e.g.: 256)
.TP
\fBnfrags\fR
Number of fragments (e.g.: 2)
.SH EXAMPLES
This will loopback the 1st two channels of
.BR hw:0
to 
.BR hw:1
using 48kHz samplerate, and 10 fragments each 2048 samples.
.nf
  alsa_loopback hw:0 hw:1 48000 2048 10
.fi
.SH "AUTHOR"
zita-alsa-pcmi was written by Fons Adriaensen <fons@linuxaudio.org>.
.PP
This manual page was written by IOhannes m zmoelnig <zmoelnig@iem.at>
for the Debian project (but may be used by others).