85 lines
2.6 KiB
Groff
85 lines
2.6 KiB
Groff
.\" $NetBSD: pad.4,v 1.10 2021/02/06 12:13:44 nia Exp $
|
|
.\"
|
|
.\" Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
.\" POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.Dd February 6, 2021
|
|
.Dt PAD 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm pad
|
|
.Nd Pseudo audio device driver
|
|
.Sh SYNOPSIS
|
|
.Cd "pseudo-device pad"
|
|
.Cd "audio* at audiobus?"
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
is a pseudo-device driver which provides support for feeding back PCM data
|
|
from consumers of an
|
|
.Xr audio 4
|
|
device to userland.
|
|
.Pp
|
|
The raw PCM data readable from
|
|
.Pa /dev/padN
|
|
is encoded in stereo little-endian 16-bit linear PCM at 44100 Hz.
|
|
.Sh FILES
|
|
The
|
|
.Nm
|
|
pseudo-device driver receives data from
|
|
.Pa /dev/audioN
|
|
and feeds the raw PCM output to
|
|
.Pa /dev/padN .
|
|
.Pa /dev/audioN
|
|
is created once
|
|
.Pa /dev/padN
|
|
is opened.
|
|
.Bl -item
|
|
.It
|
|
.Pa /dev/audioN
|
|
.It
|
|
.Pa /dev/padN
|
|
.El
|
|
.Sh EXAMPLES
|
|
The following example streams an MP3 to an Apple AirTunes compatible device:
|
|
.Bd -literal -offset indent
|
|
$ rtunes - < /dev/pad0 &
|
|
$ mpg123 -a /dev/audio1 mozart.mp3
|
|
.Ed
|
|
.Pp
|
|
Record the output of an application (in this case, audioplay):
|
|
.Bd -literal -offset indent
|
|
$ ffmpeg -f s16le -ar 44100 -ac 2 -i /dev/pad0 output.wav
|
|
$ audioplay -d /dev/audio1 input.wav
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr audio 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver
|
|
appeared in
|
|
.Nx 5.0 .
|
|
.Sh AUTHORS
|
|
.An Jared D. McNeill Aq Mt jmcneill@invisible.ca
|