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.TH "JAPA" 1 "2021-11-29" "0.9.2" "SlackBuilds.org"
.SH NAME
japa \- JACK and ALSA Audio Analyser
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.SH SYNOPSIS
.sp
japa \fB\-J\fP [\fB\-name\fP \fIname\fP ] [\fB\-s\fP \fIserver\fP]
.sp
japa \fB\-A\fP [\fB\-name\fP \fIname\fP ] [\fB\-d\fP \fIdevice\fP] [\fB\-C\fP \fIdevice\fP ] [\fB\-P\fP \fIdevice\fP ] [\fB\-r\fP \fIrate\fP] [\fB\-p\fP \fIperiod\fP] [\fB\-n\fP \fInfrags\fP]
.SH DESCRIPTION
.sp
japa (JACK and ALSA Perceptual Analyser), is a \(aqperceptual\(aq
or \(aqpsychoacoustic\(aq audio spectrum analyser. In contrast to
JAAA, this is more an acoustical or musical tool than a purely
technical one. Possible uses include spectrum monitoring while
mixing or mastering, evaluation of ambient noise, and (using
pink noise), equalisation of PA systems. For more information see
/usr/doc/japa\-0.9.2/README.
.sp
In JACK mode (\fB\-J\fP), japa creates 4 input ports (for spectrum
analysis), named \fIjapa:in_<N>\fP (where \fI<N>\fP ranges 1 to 4) and
2 output ports (for noise generation), named \fIjapa:pink\fP and
\fIjapa:white\fP\&. By default, these aren\(aqt connected to anything; use
e.g. \fBqjackctl\fP(1) or \fBjack_connect\fP(1) to connect to other JACK
clients.
.sp
In ALSA mode, the inputs and outputs are connected directly to the
ALSA device, meaning e.g. there will be 2 inputs and 2 outputs for
a typical stereo audio card. Yes, this means the pink and white
noise generators will be heard immediately on starting up japa;
if you don\(aqt need them you can silence them with e.g. \fB\-C hw:0 \-P
null\fP\&. If you get "Can\(aqt connect to ALSA", try a different device
(use \fBalsamixer\fP(1) or \fBaplay\fP(1) to get a list of them).
.SH OPTIONS
.sp
Either \fB\-J\fP or \fB\-A\fP is required.
.INDENT 0.0
.TP
.B \fB\-h\fP
Show built\-in help message.
.TP
.B \fB\-name\fP \fIname\fP
Set X11 client name (and JACK client name, with \fB\-J\fP).
.TP
.B \fB\-J\fP
Use JACK for audio. This option is available in JACK mode:
.INDENT 7.0
.TP
.B \fB\-s\fP \fIserver\fP
Connect to a specific JACK server. Default is \(aqdefault\(aq or
\fB$JACK_DEFAULT_SERVER\fP environment variable.
.UNINDENT
.TP
.B \fB\-A\fP
Use ALSA for audio. These options are available in ALSA mode:
.INDENT 7.0
.TP
.B \fB\-d\fP \fIdevice\fP
ALSA device for capture and playback. This option sets the
playback and capture devices to the same device. For separate
capture and playback, use the \fB\-C\fP and \fB\-P\fP options.
Default: \fBhw:0\fP unless \fB\-C\fP or \fB\-P\fP is used.
.TP
.B \fB\-C\fP \fIdevice\fP
ALSA device for capture. Default: not used.
.TP
.B \fB\-P\fP \fIdevice\fP
ALSA device for playback. Default: not used.
.TP
.B \fB\-r\fP \fIrate\fP
Sample frequency. Default: 48000.
.TP
.B \fB\-p\fP \fIperiod\fP
Period size. Default: 1024.
.TP
.B \fB\-n\fP \fInfrags\fP
Number of fragments. Default: 2.
.UNINDENT
.UNINDENT
.SH COPYRIGHT
.sp
See the file /usr/doc/japa\-0.9.2/COPYING for license information.
.SH AUTHORS
.sp
japa was written by Fons Adriaensen <\fI\%fons@kokkinizita.net\fP>.
.sp
This man page written for the SlackBuilds.org project
by B. Watson, and is licensed under the WTFPL.
.SH SEE ALSO
.sp
\fBjackd\fP(1), \fBjaaa\fP(1)
.sp
\fI\%https://kokkinizita.linuxaudio.org/linuxaudio/\fP
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