jack_rec - JACK toolkit client for recording audio
jack_rec -f filename -d seconds [ -b bitdepth ] port1 [ port2 ... ]
jack_rec is a basic, but useful, audio recorder that will record audio
from 1 or more JACK ports to a file on disk. The file format is always
RIFF/WAV, with samples stored as signed integers. The sample bit depth can be
selected using the -b option. The file will have as many channels as
there are ports specified on the command line - each channel will contain the
data recorded from one port. The user should generally specify the duration
(in seconds) using the -d option. If not specified, jack_rec will
record until terminated by a signal (eg. from Ctrl-c).
This application is not intended to be a heavy duty audio
recorder, and originated as an example client to show how to handle
threading and disk I/O in a JACK client. However, it is a useful, simple
recorder and is included in the JACK toolkit as a result.