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diff --git a/misc/man7/dsp.man b/misc/man7/dsp.man new file mode 100644 index 0000000..c7f9dad --- /dev/null +++ b/misc/man7/dsp.man @@ -0,0 +1,66 @@ +NAME +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 microphone). 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 +None + +FILES +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 + |