audio/record/audiorecord.1

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.\" Copyright (c) 1998, 1999, 2001, 2002, 2010 Matthew R. Green
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.Dd December 30, 2010
.Dt AUDIORECORD 1
.Os
.Sh NAME
.Nm audiorecord
.Nd record audio files
.Sh SYNOPSIS
.Nm
.Op Fl afhqV
.Op Fl B Ar buffersize
.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 port
.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,
if the file name is -, to the standard output.
.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 XpXprecisionX
.It Fl a
Append to the specified file, rather than overwriting.
.It Fl B Ar buffersize
Set the audio device read buffer size to
.Ar buffersize .
The default value is the record.buffer_size of the audio device.
.It Fl b Ar balance
Set the balance to
.Ar balance .
This value must be between 0 and 63.
.It Fl c Ar channels
Set number of channels to
.Ar channels .
.It Fl d Ar device
Set the audio device to be
.Ar device .
The default is
.Pa /dev/sound .
.It Fl e Ar encoding
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 Ar format
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 Ar monvol
Set the monitor volume.
.It Fl P Ar precision
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 Ar port
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 q
Be quiet.
.It Fl s Ar rate
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 Ar time
Sets the maximum amount of time to record.
Format is [hh:]mm:ss[.dddddd].
.It Fl V
Be verbose.
.It Fl v Ar volume
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.