.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