Manual Pages for UNIX Operating System command usage for man audio_engine_playahead

Driver Entry Points                    audio_engine_playahead(9E)



NAME
     audio_engine_playahead - return the play-ahead sample  count
     for an audio engine

SYNOPSIS
     #include 

     uint_t prefix_playahead(void *state);


PARAMETERS
     state    pointer to driver supplied soft state.


INTERFACE LEVEL
     Solaris DDI specific (Solaris DDI)

DESCRIPTION
     The  audio_engine_playahead()  function  returns  a  driver-
     supplied  hint  indicating  how  many  frames  the framework
     should queue up to the device  to  avoid  device  underruns.
     This  entry  point  is optional and NULL may be supplied, in
     which case the framework will assume a default that is  rea-
     sonable for most devices.


     This entry point is most appropriate for devices with incon-
     sistent  scheduling,  such  as  emulated  devices or devices
     backed by user programs. For these devices, this entry point
     allows  the  driver to supply a larger value than the normal
     default.

RETURN VALUES
     The audio_engine_playahead() function returns the number  of
     frames the framework should queue for playback.

USAGE
     This function is only  called  after  the  device  is  first
     opened; the dynamically changing values are not supported.

CONTEXT
     This function may be called from user or interrupt context.

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









SunOS 5.11          Last change: 16 Apr 2010                    1






Driver Entry Points                    audio_engine_playahead(9E)



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|


SEE ALSO
     attributes(5), audio(7D), audio_engine_ops(9S)














































SunOS 5.11          Last change: 16 Apr 2010                    2