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UAUDIO(4)		 BSD Kernel Interfaces Manual		     UAUDIO(4)

NAME
     uaudio — USB audio device driver

SYNOPSIS
     uaudio* at uhub?
     audio*  at audiobus?

DESCRIPTION
     The uaudio driver provides support for USB audio class devices.

     A USB audio device consists of a number of components: input terminals
     (e.g. USB digital input), output terminals (e.g.  speakers), and a number
     of units in between (e.g. volume control).	 The following types of units
     are handled by the uaudio driver and are accessible via the mixer (see
     audio(4)) interface:
	mixer	      A mixer has a number of inputs and one output.  Each
		      input has a control that determines its volume in the
		      output.  The name of the control is mixN-S, where N is a
		      number that identifies which mixer it is and S which
		      input.
	selector      A selector unit selects one of multiple audio sources
		      such as mic-in and line-in.  The name of the control is
		      selN-S1S2S3..., where N is a number that identifies
		      which selector unit it is and the sequence of Sn indi‐
		      cates candidate units for the audio source.
	feature	      A feature unit changes the sound in some way, like bass,
		      treble, mute, or volume.	The name of the control is
		      determined in a heuristic way.  If the unit changes the
		      sound to a speaker output terminal, the names of the
		      controls may be outputs.speaker.bass, out‐
		      puts.speaker.treble, outputs.speaker.mute, out‐
		      puts.speaker, or likewise.
	processing    A processing unit does one of a number of audio process‐
		      ing functions (e.g., channel up-down mixing, Dolby Pro‐
		      Logic, or chorus effects).  The name of the on-off con‐
		      trol is proN.M-enable, where N is a number that identi‐
		      fies which processing unit it is and M which kind.
		      Depending on the type of processing unit there may be
		      other controls as well.
	extension     An extension unit performs some unspecified audio pro‐
		      cessing The name of the on-off control is extN-enable,
		      where N is a number that identifies which processing
		      unit it is.

     For more information the USB Audio class specification is indispensable
     reading.

SEE ALSO
     audio(4), usb(4)

     USB Approved Class Specification Documents,
     http://www.usb.org/developers/devclass_docs/.

HISTORY
     The uaudio driver appeared in NetBSD 1.5.

BUGS
     There is no support for multiple-endpoints audio stream, adaptive record‐
     ing, async playback, and TYPE-II/III formats.

     There is the possibility that a device has multiple mixer items which
     have the same name.

BSD			      September 20, 2011			   BSD

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