[hpsdr] Mac ghpsdr

[Bill Tracey]

Well done .. looks quite slick on the YouTube Video!

What hardware are you running this on?  Makes me think maybe it's 
time I got a Mac Mini, not that I really need another computer to care for!

Cheers,

Bill

At 03:53 PM 2/9/2010, Jeremy McDermond wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>I've actually worked on this a little bit more to see if I can do 
>some further optimzations and I actually have it so that I'm not 
>hearing any noticible pops or crackles even when I'm doing really 
>intensive things like screen captures and such.  Just trying to do a 
>screen capture to post a youtube video of ghpsdr used to make the 
>audio go to hell.  Current code is checked into my SVN 
>repository.  Make sure you recompile libDttSP.a because I made some 
>changes to threading in that library.  I also updated the Wiki to 
>reflect more information on what I've changed from the "stock" 
>ghpsdr.  Mainly the latest changes are:
>
>- Supporting "Chained" asynchronous reads.  Immediately upon 
>entering the callback function we fire off another asynchronous 
>read.  That makes sure we always have one "in the pipe" and getting 
>data from the IO subsystem.
>
>- Supporting "Chained" asynchronous writes.  Instead of just using a 
>null callback, we check inside the callback to see if we have enough 
>data to write out to Ozy.  If we do, we immediately dispatch another 
>asynchronous write.  If not, we remove our lock and let the next 
>iteration of the read loop fire off a write.  This, again, should 
>make sure that we get things out to Ozy as expediently as possible.
>
>- Changed the DttSP process_samples priority so that it is realtime 
>like the read and write threads.  This was the last thing I did, and 
>it seems to have cleaned up a lot of issues.
>
>I haven't done extensive testing, but everything I've thrown at it 
>so far seems to be okay.  I also am compromised by the fact that I 
>don't yet have a Penelope to test transmitting with.  So, I don't 
>know how any of these changes affect transmission.
>
>I also posted a YouTube video of my receiver in action from the QTH 
>in Springfield, MA.
>
>http://www.youtube.com/watch?v=nojqdSS1fCA
>--
>Jeremy McDermond
>Xenotropic Systems
>mcdermj at xenotropic.com



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