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Plan 9 - man page for audio (plan9 section 3)

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AUDIO(3)										 AUDIO(3)

       audio - digital audio input and output

       bind -a #A /dev


       The  audio  device  serves a one-level directory, giving access to the stereo audio ports.
       Audio is the data file, which can be read or written to use the port.   Audio  data  is	a
       sequence  of  stereo  samples,  left  sample first.  Each sample is a 16 bit little-endian
       two's complement integer; the default sampling rate is  44.1  kHz.   Some  implementations
       only support audio output and return a zero length when read.

       Volume  is  the control file associated with the audio port.  Each input and output source
       has an associated stereo volume control, ranging from 0 (quiet) to 100 (loud).	In  addi-
       tion,  there  are controls for the sampling rate of the D/A and A/D converters and for any
       tone controls.  Reads return lines of the form

	      source in left value right value out left value right value

       possibly abbreviated if the values are shared or non-existent.  For example, if all of the
       values  are  shared,  the form degenerates to `source value'.  Valid sources depend on the
       particular audio device, though all devices have a audio stereo source, which controls the
       output volume from the D/A converter connected to audio.

       Writes  accept the same format with same abbreviations.	Writing the string reset sets all
       of the attributes to their default value, and  if  no  attribute  is  supplied,	audio  is

       The Sound Blaster 16 (or MCD) is half-duplex and has the following controls.

       audio out
	      Data written to audio.

       synth in out
	      MIDI synthesizer.

       cd in out
	      CD player.

       line in out
	      Line-level input.

       mic in out
	      Monaural microphone input.

       speaker in out
	      Monaural internal speaker connection.

       treb out
	      Stereo treble tone control.  Values less than 50 decrease the treble, those greater
	      increase it.

       bass out
	      Stereo bass tone control.

       speed in out
	      Sampling rate for the D/A and A/D converters, expressed in Hz.  Defaults to 44100.

       Indigo audio is full-duplex and has the following controls.

       audio out
	      Data written to audio.

       line in out
	      Line-level input.

       mic in out
	      Microphone input.

       aes in out
	      Digital input.

       Nextstation audio is output only and has the following controls.

       audio  Data written to audio.

       deemp  A value of zero turns off the stereo de-emphasis filter, any other value	turns  it


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