[Live-devel] Push (instead of Pull) to custom DeviceSource

[Chad Ata]

Aww.. i was hoping for a really easy way out =)
I was trying to avoid queuing incoming data.

Thanks for the suggestions. I'll probably go the watchVariable route..


-Chad



                                                                           
             Ross Finlayson                                                
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             10/11/2007 17:59                                      Subject 
                                       Re: [Live-devel] Push (instead of   
                                       Pull) to custom DeviceSource        
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>I'd like to just call doGetNextFrame() at my own pace when I have data
>ready for it.

No, "getNextFrame()" (and thus "doGetNextFrame()") must be called by
the downstream object, when it is willing to receive data - i.e., the
'pull' model.

What you can do, however, is arrange to call your "deliverFrame()"
function (*not* "doGetNextFrame()") when data becomes available.  The
best way to do this is to have "the availability of new data" be an
'event', that gets handled within the event loop.

Is your input device an open file (this is often true if you're
running a Unix (including Linux) system)?  If so, then you can do
this easily using "TaskScheduler::turnOnBackgroundReadHandling()".
If not, then you can use the "watchVariable" feature of
"doEventLoop()" to do this - along with a separate thread that
watches for the availability of new data, and sets the
"watchVariable" when this happens.  (See the FAQ.)  (Alternatively,
you could write your own "TaskScheduler" subclass in order to make
the availability of new data an 'event', but that is far more
complicated to do.)
--

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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