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.TH out123 1 "26 May 2016"
.SH NAME
out123 \- send raw PCM audio or a waveform pattern to an output device
.SH SYNOPSIS
.B cat audio.raw | out123
[
.B options
]
.B out123 --wave-freq
freq1[,freq2,...]
[
.B options
]
.SH DESCRIPTION
.B out123
reads raw PCM data (in host byte order) from standard input
and plays it on the audio device specified by given options.
Alternatively, it can generate periodic signals for playback
itself.
.SH OPTIONS
.B out123
options may be either the traditional POSIX one letter options,
or the GNU style long options. POSIX style options start with a
single ``\-'', while GNU long options start with ``\-\^\-''.
Option arguments (if needed) follow separated by whitespace (not ``='').
Note that some options can be absent from your installation when disabled in the build process.
.TP
\fB\-\^\-name \fIname
Set the name of this instance, possibly used in various places. This sets the client name for JACK output.
.TP
\fB\-o \fImodule\fR, \-\^\-output \fImodule\fR
Select audio output module. You can provide a comma-separated list to use the first one that works.
.TP
\fB\-\^\-list\-modules
List the available modules.
.TP
\fB\-a \fIdev\fR, \fB\-\^\-audiodevice \fIdev
Specify the audio device to use. The default is
system-dependent (usually /dev/audio or /dev/dsp).
Use this option if you have multiple audio devices and
the default is not what you want.
.TP
.BR \-s ", " \-\^\-stdout
The audio samples are written to standard output,
instead of playing them through the audio device.
The output format is the same as the input ... so in this mode,
.B out123
acts like the standard tool \fB cat.
This shortcut is equivalent to ``-o raw -a -''.
.TP
\fB\-O \fIfile\fR, \fB\-\^\-outfile
Write raw output into a file (instead of simply redirecting standard output to a file with the shell).
This shortcut is equivalent to ``-o raw -a \fIfile\fR''.
.TP
\fB\-w \fIfile\fR, \fB\-\^\-wav
Write output as WAV file
.I file
, or standard output if
.I -
is or the empty string used as file name. You can also use
.I --au
and
.I --cdr
for AU and CDR format, respectively. Note that WAV/AU writing to non-seekable files or redirected stdout needs some thought. The header is written with the first actual data. The result of decoding nothing to WAV/AU is a file consisting just of the header when it is seekable and really nothing when not (not even a header). Correctly writing data with prophetic headers to stdout is no easy business.
This shortcut is equivalent to ``-o wav -a \fIfile\fR''.
.TP
\fB\-\^\-au \fIfile
Write to
.I file
in SUN audio format. If \- or the empty string is used as the filename, the AU file is
written to stdout. See paragraph about WAV writing for header fun with non-seekable streams.
This shortcut is equivalent to ``-o au -a \fIfile\fR''.
.TP
\fB\-\^\-cdr \fIfile
Write to
.I file
as a CDR (CD-ROM audio, more correctly CDDA for Compact Disc Digital Audio).
If \- is or the empty string used as the filename, the CDR file is written
to stdout.
This shortcut is equivalent to ``-o cdr -a \fIfile\fR''.
.TP
\fB\-r \fIrate\fR, \fB\-\^\-rate \fIrate
Set sample rate in Hz (default: 44100). If this does not match the actual input
sampling rate, you get changed pitch. Might be intentional;-)
.TP
\fB\-c \fIcount\fR, \fB\-\^\-channels \fIcount
Set channel count to given value.
.TP
\fp\-e \fIenc\fR, \fB\-\^\-encoding \fIenc
Choose output sample encoding. Possible values look like f32 (32-bit floating point), s32 (32-bit signed integer), u32 (32-bit unsigned integer) and the variants with different numbers of bits (s24, u24, s16, u16, s8, u8) and also special variants like ulaw and alaw 8-bit.
See the output of \fBout123\fR's longhelp for actually available encodings.
Default is s16.
.TP
.BR \-m ", " \-\^\-mono "
Set for single-channel audio (default is two channels, stereo).
.TP
.BR \-\-stereo
Select stereo output (2 channels, default).
.TP
.BR \-\^\-list\-encodings
List known encoding short and long names to standard output.
.TP
.BR \-\^\-test\-format
Check if given format is supported by given driver and device (in command line before
encountering this), silently returning 0 as exit value if it is the case.
.TP
.BR \-\^\-test\-encodings
Print out the short names of encodings supported with the current setup.
.TP
.BR \-\^\-query\-format
If the selected driver and device communicate some default accepted format, print
out a command line fragment for \fBout123\fR setting that format, always in that order:
\-\^\-rate <r> -\^\-channels <c> -\^\-encoding <e>
.TP
.BR "\-o h" ", " \-\^\-headphones
Direct audio output to the headphone connector (some hardware only; AIX, HP, SUN).
.TP
.BR "\-o s" ", " \-\^\-speaker
Direct audio output to the speaker (some hardware only; AIX, HP, SUN).
.TP
.BR "\-o l" ", " \-\^\-lineout
Direct audio output to the line-out connector (some hardware only; AIX, HP, SUN).
.TP
\fB\-b \fIsize\fR, \fB\-\^\-buffer \fIsize
Use an audio output buffer of
.I size
Kbytes. This is useful to bypass short periods of heavy
system activity, which would normally cause the audio output
to be interrupted.
You should specify a buffer size of at least 1024
(i.e. 1 Mb, which equals about 6 seconds of usual audio data) or more;
less than about 300 does not make much sense. The default is 0,
which turns buffering off.
.TP
\fB\-\^\-preload \fIfraction
Wait for the buffer to be filled to
.I fraction
before starting playback (fraction between 0 and 1). You can tune this prebuffering to either get sound faster to your ears or safer uninterrupted web radio.
Default is 0.2 (changed from 1 since version 1.23).
.TP
\fB\-\^\-devbuffer \fIseconds
Set device buffer in seconds; <= 0 means default value. This is the small buffer between the
application and the audio backend, possibly directly related to hardware buffers.
.TP
\fB\-\^\-timelimit \fIsamples
Set playback time limit in PCM samples if set to a value greater than zero.
\fBout123\fR will stop reading from stdin or playing from the generated wave
table after reaching that number of samples.
.TP
\fB\-\^\-wave\-freq \fIfrequencies
Set wave generator frequency or list of those with comma separation for enabling
a generated test signal instead of standard input. Empty values repeat the
previous one.
.TP
\fB\-\^\-wave\-pat \fIpatterns
Set the waveform patterns of the generated waves as comma-separated list.
Choices include sine, square, triangle, sawtooth, gauss, pulse, and shot.
Empty values repeat the previous one.
.TP
\fB\-\^\-wave\-phase \fIphases
Set waveform phase shift(s) as comma-separated list, negative values
inverting the pattern in time and empty value repeating the previous.
.TP
\fB\-\^\-wave\-limit \fIsamples
Set a custom soft limit on the wave table size. Small values cause larger changes
in actual frequencies to make whole periods fit.
.TP
.BR \-t ", " \-\^\-test
Test mode. The audio stream is read, but no output occurs.
.TP
.BR \-v ", " \-\^\-verbose
Increase the verbosity level.
.TP
.BR \-q ", " \-\^\-quiet
Quiet. Suppress diagnostic messages.
.TP
\fB\-\^\-aggressive
Tries to get higher priority
.TP
.BR \-T ", " \-\-realtime
Tries to gain realtime priority. This option usually requires root
privileges to have any effect.
.TP
.BR \-? ", " \-\^\-help
Shows short usage instructions.
.TP
.BR \-\^\-longhelp
Shows long usage instructions.
.TP
.BR \-\^\-version
Print the version string.
.SH AUTHORS
.TP
Maintainer:
.br
Thomas Orgis <maintainer@mpg123.org>, <thomas@orgis.org>
.TP
Creator (ancestry of code inside mpg123):
.br
Michael Hipp
.TP
Uses code or ideas from various people, see the AUTHORS file accompanying the source code.
.SH LICENSE
.B out123
is licensed under the GNU Lesser/Library General Public License, LGPL, version 2.1 .
.SH WEBSITE
http://www.mpg123.org
.br
http://sourceforge.net/projects/mpg123