pad(4) - NetBSD Manual Pages

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PAD(4)                  NetBSD Kernel Interfaces Manual                 PAD(4)


NAME

     pad -- Pseudo audio device driver


SYNOPSIS

     pseudo-device pad
     audio* at audiobus?


DESCRIPTION

     pad is a pseudo-device driver which provides support for feeding back PCM
     data from consumers of an audio(4) device to userland.

     The raw PCM data readable from /dev/padN is encoded in stereo little-
     endian 16-bit linear PCM at 44100 Hz.


FILES

     The pad pseudo-device driver receives data from /dev/audioN and feeds the
     raw PCM output to /dev/padN.  /dev/audioN is created once /dev/padN is
     opened.

     /dev/audioN

     /dev/padN


EXAMPLES

     The following example streams an MP3 to an Apple AirTunes compatible
     device:

           $ rtunes - < /dev/pad0 &
           $ mpg123 -a /dev/audio1 mozart.mp3

     Record the output of an application (in this case, audioplay):

           $ ffmpeg -f s16le -ar 44100 -ac 2 -i /dev/pad0 output.wav
           $ audioplay -d /dev/audio1 input.wav


SEE ALSO

     audio(4)


HISTORY

     The pad driver appeared in NetBSD 5.0.


AUTHORS

     Jared D. McNeill <jmcneill@invisible.ca>

NetBSD 10.1                    February 6, 2021                    NetBSD 10.1