[Live-devel] interactive support

[hornsby]

Hi again Ross,

I'm having little trouble to understand the watchVariable variable. 
In fact, I need depending if for example the 'a' key is press,
in 
void MPEG2TransportStreamSplicer::doGetNextFrame() {
  //implementation of the virtual fonction

if(a_key_pressed==true){
	fInputSource1->getNextFrame(fTo,fMaxSize, afterGettingFrame,
    				this,FramedSource::handleClosure,
				this); 
   }
if(b_key_pressed==true){
	fInputSource2->getNextFrame(fTo,fMaxSize, afterGettingFrame,
    				this,FramedSource::handleClosure,
				this); 
   }
}

so I dunno how your solution can be applied here.
I have done the modification 

while(1) {
	watchVariable = 0;
	env->taskScheduler().doEventLoop(&watchVariable);
	switch (watchVariable){
		case 'a': {
			//handle the pressing of key 'a'
			videoSource->a_key_pressed = true;
			break;
		}
		case 'b': {
			//handle the pressing of key 'b'
			videoSource->b_key_pressed = true;
			break;
		}
	}
}

But how then I get that a or b is pressed, do I have to use another function 
like control.keydown event (in windows world) but for linux ?? or is it 
already implemented with this watchVariable thing?

> Then, elsewhere in your program, do
>          if (/* key 'a' is pressed*/) {
>                  watchVariable = 'a';
>          }

thanks a lot again and again


On Thursday 29 September 2005 11:54, Ross Finlayson wrote:
> >Sorry if this was asked before, I checked the archive
> >without success, but I would like to know if LiveMedia
> >library has already support for interactive control ?
> >By this I mean I want to be able to start a function
> >anytime during the runtime of my program by pressing a
> >key on the keyboard.
>
> Yes, there are two possible ways to do this.
>
> The most general (but most complicated) way is to write a new
> "TaskScheduler" subclass, that implements a new event loop, and use
> this instead of "BasicTaskScheduler".
>
> A much simpler (but less general) way is to use the "watchVariable"
> feature of "TaskScheduler::doEventLoop()".  E,g.
>
> replace
>          env->taskScheduler().doEventLoop();
> with
>          char watchVariable; // make this a global variable
>          ...
>          while (1) {
>                  watchVariable = 0;
>                  env->taskScheduler().doEventLoop(&watchVariable);
>                  switch (watchVariable) {
>                          case 'a': {
>                                  // handle the pressing of key 'a'
>                                  break;
>                          }
>                          case 'b': {
>                                  // hande the pressing of key 'b'
>                                  break;
>                          }
>                          // etc.
>                  }
>          }
>
> Then, elsewhere in your program, do
>          if (/* key 'a' is pressed*/) {
>                  watchVariable = 'a';
>          }
> etc.
>
>
> 	Ross Finlayson
> 	Live Networks, Inc. (LIVE555.COM)
> 	<http://www.live555.com/>
>
> _______________________________________________
> live-devel mailing list
> live-devel at lists.live555.com
> http://lists.live555.com/mailman/listinfo/live-devel

		
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