🚀 go-pugleaf

In article <1k11ulINNqq0@iraul1.ira.uka.de>, fuchs@ira.uka.de (Stefan Fuchs) writes:
> Hi!
> 
> Has anybody out there managed to change the 
> 
> * sampling rate
> * number of channels
> * precision
> 
> of the audio device on a SS10?
> 
> Anytime that I try to assign a value (even the values AUDIO_GETINFO returns)
> to one of these parameters I get an "Invalid Argument"-Message form the
> AUDIO_SETINFO call.

I have succeeded in altering other parameters although I haven't tried
the ones you mention.  I found that it was necessary to use the
procedure documented in TFM:

          The audio_info structure may be initialized through the
          use  of  the AUDIO_INITINFO macro.  This macro sets all
          fields in the structure to values that are  ignored  by
          the AUDIO_SETINFO command.  For instance, the following
          code switches the output port from the built-in speaker
          to the headphone jack without modifying any other audio
          parameters:

               audio_info_t   info;

               AUDIO_INITINFO(&info);
               info.play.port = AUDIO_HEADPHONE;
               err = ioctl(audio_fd, AUDIO_SETINFO, &info);

          This technique is preferred over using  a  sequence  of
          AUDIO_GETINFO followed by AUDIO_SETINFO.

I wondered about the exact meaning of `preferred' but after some trials
and failures discovered that it more or less translates as `do it this
way or it won't work'.
______________________________________________________________________________
James Ashton						  System Administrator
					     Department of Systems Engineering
Voice +61 6 249 0681	  Research School of Physical Sciences and Engineering
FAX   +61 6 249 2698				Australian National University
Email James.Ashton@syseng.anu.edu.au	 GPO Box 4 Canberra ACT 2601 Australia