alsa_loopback - Online in the Cloud

PROGRAM:

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

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