audio/record/audiorecord.1

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.\" Copyright (c) 1998-1999 Matthew R. Green
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.Dd October 13, 2002
.Dt AUDIORECORD 1
.Os
.Sh NAME
.Nm audiorecord
.Nd record audio files
.Sh SYNOPSIS
.Nm ""
.Op Fl afhV
.Op Fl b Ar balance
.Op Fl c Ar channels
.Op Fl d Ar device
.Op Fl e Ar encoding
.Op Fl F Ar format
.Op Fl i Ar info
.Op Fl m Ar monvol
.Op Fl P Ar precision
.Op Fl p Ar input
.Op Fl s Ar rate
.Op Fl t Ar time
.Op Fl v Ar volume
.Ar file
.Sh DESCRIPTION
The
.Nm
program copies the audio device to the named audiofile or to the standard
output if no file is named.
.Pp
The output file will contain either a Sun/NeXT audio header, a
RIFF/WAVE audio header or no header at all.
Sun output files using a linear PCM encoding are written with big-endian
signed samples, possibly after converting these from little-endian or
unsigned samples.
RIFF/WAVE files are written in little-endian, signed samples, also
converting if necessary.
The default output is Sun/NeXT format, but if the output file
.Ar file
ends with a
.Pa .wav
file extension it will be written as RIFF/WAVE.
.Sh OPTIONS
The following options are available:
.Bl -tag -width 123456
.It Fl a
Append to the specified file, rather than overwriting.
.It Fl b
Set the balance to
.Ar balance .
This value must be between 0 and 63.
.It Fl c
Set number of channels to
.Ar channels .
.It Fl d
Set the audio device to be
.Ar device .
The default is
.Pa /dev/sound .
.It Fl e
Set encoding to either
.Dq alaw ,
.Dq ulaw
or
.Dq linear ,
or any other value reported by
.Ic audioctl encodings .
The default encoding is
.Dq ulaw .
If the output format is
.Dq sun ,
the file will contain slinear_be samples, if it is
.Dq wav ,
then slinear_le, independent of the argument to
.Fl e .
Setting the argument to
.Fl e
still may be important since it is used in an
.Xr ioctl 2
call to the kernel to choose the kind of data provided.
.It Fl F
Set the output header format to
.Ar format .
Currently supported formats are
.Dq sun ,
.Dq wav
and
.Dq none
for Sun/NeXT audio, WAV and no header, respectively.
.It Fl f
Force.
Normally when appending to audiofiles using the
.Fl a
option, the sample rates must match.
The
.Fl f
option will allow a discrepancy to be ignored.
.It Fl h
Print a help message.
.It Fl i Ar info
If supported by the
.Fl F
format, add the string
.Ar info
to the output header.
.It Fl m
Set the monitor volume.
.It Fl P
Set the precision.
This value is the number of bits per sample, and is normally either
.Dq 8
or
.Dq 16 ,
though the values
.Dq 4 ,
.Dq 24
and
.Dq 32
are also valid.
.It Fl p
Set the input port to
.Ar port .
The valid values of
.Ar port
are
.Dq cd ,
.Dq internal-cd
.Dq mic
and
.Dq line .
.It Fl s
Set the sampling rate.
This value is per-second.
Typical values are 8000, 44100 and 48000, which are the telephone,
CD Audio and DAT Audio default sampling rates.
.It Fl t
Sets the maximum amount of time to record.
Format is [hh:]mm:ss.
.It Fl q
Be quiet.
.It Fl V
Be verbose.
.It Fl v
Set the volume (gain) to
.Ar volume .
This value must be between 0 and 255.
.El
.Sh ENVIRONMENT
.Bl -tag -width AUDIOCTLDEVICE
.It AUDIOCTLDEVICE
the audio control device to be used.
.It AUDIODEVICE
the audio device to be used.
.El
.Sh SEE ALSO
.Xr audioctl 1 ,
.Xr audioplay 1 ,
.Xr aria 4 ,
.Xr audio 4 ,
.Xr audioamd 4 ,
.Xr auich 4 ,
.Xr autri 4 ,
.Xr auvia 4 ,
.Xr clcs 4 ,
.Xr clct 4 ,
.Xr cmpci 4 ,
.Xr eap 4 ,
.Xr emuxki 4 ,
.Xr esm 4 ,
.Xr eso 4 ,
.Xr ess 4 ,
.Xr fms 4 ,
.Xr gus 4 ,
.Xr guspnp 4 ,
.Xr neo 4 ,
.Xr sb 4 ,
.Xr sv 4 ,
.Xr wss 4 ,
.Xr yds 4 ,
.Xr ym 4
.Sh HISTORY
The
.Nm
program was first seen in SunOS 5.
It was first made available in
.Nx 1.4 .
RIFF/WAVE support, and support for converting signed/unsigned and
big/little-endian samples was first made available in
.Nx 1.6 .
.Sh AUTHORS
The
.Nm
program was written by
.An Matthew R. Green Aq mrg@eterna.com.au .
.Sh BUGS
WAV big-endian samples are converted to little-endian, rather than
a RIFX header being written.