[ новости /+++ | форум | теги | ]

NAME
     utaudio -  connect to Sun Ray audio services

SYNOPSIS
     /opt/SUNWut/bin/utaudio

  csh
     setenv AUDIODEV `utaudio`

  ksh
     export AUDIODEV=`utaudio`

  sh
     AUDIODEV=`utaudio`;export AUDIODEV

DESCRIPTION
     utaudio enables standard Solaris audio  services  using  the
     utadem(7D) audio device emulator driver. After connecting to
     a Sun Ray session, utadem(7D) is asked to create a new audio
     device.  From  this  device, utaudio creates device files in
     the /tmp/SUNWut/dev directory. It then echoes the root  dev-
     ice name to standard output, for the purposes of setting the
     AUDIODEV environment variable. Standard  audio  applications
     can  then open the new audio pseudo-device and perform audio
     play and record operations.

APPLICATION PROGRAM INTERFACE
     Applications that use the /dev/audio interface may open  the
     device  pointed  to by the AUDIODEV environment variable and
     use the AUDIO_GETDEV ioctl to determine which  audio  device
     is  being  used.  The  utaudio driver will return the string
     "SUNW,CS4231" in the name field of the  audio_device  struc-
     ture  to  indicate compatibility with other Ultra platforms.
     The version field will contain "a" and the config field will
     contain "pseudo."

     The AUDIO_SETINFO ioctl controls device configuration param-
     eters.  When  an application modifies the record.buffer_size
     field using the AUDIO_SETINFO ioctl, the  daemon  will  con-
     strain it to be non-zero and up to a maximum of 8180 bytes.

     Audio Data Formats
           The utaudio daemon supports u-law and A-law with 8-bit
           precision,  or  16-bit  linear  PCM at any sample rate
           from 8000 Hz to 48 kHz for one or  two  channels.  The
           Sun Ray standard for sampling rate is 48 kHz, so using
           that rate will yield the best quality. The  input  and
           output  data  formats for playing and recording do not
           have to match. Some input devices do  not  support  2-
           channel  capture,  but two channels will be reproduced
           by duplication in the  case  where  two  channels  are
           requested and the device supports only one.

      Audio Ports
           The record.avail_ports and play.avail_ports fields  of
           the  audio_info  structure  report the available input
           and output ports for the currently connected  Sun  Ray
           appliance.   Currently   only   AUDIO_MICROPHONE   and
           AUDIO_LINE_IN are supported,  and  most  devices  will
           have  both  inputs.  The  Sun Ray audio model supports
           individual volume controls for the two, so it is  pos-
           sible  that  the volume setting will change with input
           changes. This has the feature  of  always  maintaining
           the correct level for each input.

           For output, AUDIO_LINE_OUT is always selected and does
           not    have    variable    gain.   AUDIO_SPEAKER   and
           AUDIO_HEADPHONE are supported normally, and they share
           a  level control, but in general, comfortable settings
           for the speaker will also be comfortable for headphone
           use. Either one or both outputs can be selected simul-
           taneously. The Sun Ray specification supports a third,
           automatic  switching  mode  that  can  be  accessed by
           deselecting both speaker and headphone, or by  select-
           ing  only line out. The utsettings(1) command may also
           be used to control the device's outputs. In  automatic
           mode,  the  settings  track the physical connection of
           the headphone.

EXIT STATUS
     The following exit values are returned:

     0     Normal completion -- daemon back grounded

     1     Either the X11 server, or the  session  could  not  be
           contacted,  or  there  was  a problem creating the new
           pseudo audio device.

ENVIRONMENT
     utaudio requires that the DISPLAY  environment  variable  be
     set  to  an  X11(7)  display to which the user has access to
     rendezvous with the Sun Ray session. This is usually  set-up
     automatically in the Sun Ray environment.

     An alternate driver emulator, or different unit  number  can
     be specified in the UT_ADEM environment variable.

     The results of utaudio should  be  placed  in  the  AUDIODEV
     environment variable.

FILES
     The following files are used:

     /tmp/SUNWut/dev/utaudio/<n>
           numbered audio data pseudo-device file nodes

     /tmp/SUNWut/dev/utaudio/<n>ctl
           matching control pseudo-device   file nodes

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Architecture                | SPARC                       |
    | Availability                | SUNWuto                     |
    |_____________________________|_____________________________|


SEE ALSO
     utsettings(1), X11(7), utadem(7D),  audio(7I),  steamio(7I),
     ioctl(2), priocntl(2), attributes(5), environ(5)

NOTES
     The audio(7I) interface  does  not  have  an  interface  for
     dynamically  changing  audio devices such as that offered by
     Sun Ray. It is not possible to track the comings and  goings
     of  sessions, or changes in audio hardware using this device
     interface. The utaudio daemon makes a best-effort attempt to
     report  changes  in  device  control ability and to make the
     device appear as flexible as possible, then match that abil-
     ity to the actual Sun Ray hardware being run.

     If a session is disconnected or moving,  audio  output  will
     continue  as  if there were actual hardware connection, even
     though no samples are actually being transmitted or  played.
     On  the other hand, audio input will stop for lack of a con-
     nected device.

Партнёры:

Хостинг: