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ossdevlinks(8) [debian man page]

ossdevlinks(8)						OSS System Administration Commands					    ossdevlinks(8)

ossdevlinks - Open Sound System legacy device management utility. SYNOPSIS
ossdevlinks [-vr] DESCRIPTION
The ossdevlinks utility creates and manages old style (legacy) device files for OSS audio, MIDI and mixer devices. In previous versioms OSS used "flat" device numbering for the device files (for example /dev/dsp0 to /dev/dspN). OSS version 4.0 and later uses different naming scheme. The ossdevlinks utility is used to manage the legacy device names as symbolic links to the new style devices. OPTIONS
Normally ossdevlinks is used without command line arguments. However there are a few command line options. -f<name> Write legacydev file to <fname>. -N Do not actually modify device files -r Reset the legacy device numbering (do not use). -v Verbose output The -r option may invalidate audio device selections in the setup files of various applications. This is considered highly undesirable. Applications using wrong audio devices may cause serious security and privacy problems. For this reason the -r option should never be used unless there are no other ways to recover from serious audio/sound related problems. After that users should review the audio settings of all the audio applications they are using. SEE ALSO
ossinfo(1) FILES
/usr/sbin/ossdevlinks /var/lib/oss4/legacy_devices /dev/dspN /dev/midiNN /dev/mixerN AUTHOR
4Front Technologies 16 December 2012 ossdevlinks(8)

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dsp - Open Sound System audio devices DESCRIPTION
/dev/dsp is the default audio device in the system. It's connected to the main speakers and the primary recording source (such as micro- phone). The system administrator can set /dev/dsp to be a symbolic link to the desired default device. The ossinfo utility can be used to list the available audio devices in the system. /dev/dsp_mmap, /dev/dsp_ac3, /dev/dsp_multich and /dev/dsp_spdifout are default audio devices for specific applications such as games or media (DVD) players. DIRECT ACCESS AUDIO DEVICE FILES
OSS 4.0 (and later) will create audio devices under /dev/oss/<device> directory. For example /dev/oss/sblive0/pcm0 is the first audio device that belongs to the first Sound Blaster Live! or Audigy card in the system. These direct devices are used when an application needs to access specific audio device (instead of the default one). You can use the ossinfo(1) utility with the -a option to get a list of the available audio devices in the system. LEGACY AUDIO DEVICE FILES
Traditionally OSS has created device files like /dev/dsp0 to /dev/dspN for each audio device in the system. OSS 4.0 still supports this legacy naming. These files are symbolic links to the actual device files located under /dev/oss. The ossdevlinks(8) utility is used to manage these links and it will be automatically invoked when OSS is started. COMPATIBILITY
o The /dev/dsp (default() audio device file will be supported by all OSS implementations and versions. o The special purpose audio default devices (such as /dev/dsp_mmap) are only supported by OSS 4.0 and later. o The legacy audio device files (such as /dev/dsp1) are supported by all OSS versions and implementations. o New style audio device files (under /dev/oss) are only supported by OSS 4.0 and later. However some independent OSS implementations may only support the legacy naming even they are otherwise OSS 4.0 compatible. o /dev/dsp0 doesn't exist in all Linux systems which use /dev/dsp for the same purpose. In such systems /dev/dsp points to the first audio device and /dev/dsp1 to the second. PROGRAMMING INFORMATION
See the Audio Programming section of the OSS Programmer's Guide (DSP(2)) for more info. OPTIONS
o /dev/dsp Default audio device o /dev/dsp_mmap Default audio device for applications using mmap(2) o /dev/dsp_ac3 Default audio device for applications sending Dolby Digital (AC3) audio to an external receiver. o /dev/dsp_multich Default multichannel (4.0-7.1) audio output device o /dev/dsp_spdifout Default digital audio (S/PDIF) output device o /dev/oss/<driver>/pcmN Direct access device files for individual audio devices. o /dev/dsp0 to /dev/dspN Legacy style direct access audio device files. AUTHOR
4Front Technologies OSS Devices 7(16 December 2012)
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