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List:       kde-multimedia
Subject:    Re: StereoVolumeControl with SimpleSoundServer
From:       Scott Wheeler <scott () slackorama ! net>
Date:       2002-02-21 5:57:07
[Download RAW message or body]

Ok, thanks!  That's been sort of helpful.  :-)

I found the example in the now pretty old KDE 2.0 book and managed to get 
StereoVolumeControl working for the whole server, but I can't figure out how 
to get it to do so with just the PlayObject that I'm working with.

Here's my code:
===
void Player::setVolume(float volume=1.0)
{
  
  // setup volume control
  volumeControl = new 
StereoVolumeControl(DynamicCast(server->createObject("Arts::StereoVolumeControl")));
  if(volumeControl && media && !volumeControl->isNull() && !media->isNull()) {

    Synth_BUS_UPLINK uplink = Arts::DynamicCast(media->_getChild( "uplink" ));
    uplink.stop();
    media->_node()->stop();

    //	  volumeControlId = server->outstack().insertBottom(*volumeControl, 
"Volume");

    Arts::disconnect(*media, "left", uplink, "left");
    Arts::disconnect(*media, "right", uplink, "right");

    volumeControl->start();
    uplink.start();
    media->_node()->start();
    media->_addChild(*volumeControl, "volume" );

    Arts::connect(*media, "left", *volumeControl, "inleft");
    Arts::connect(*media, "right", *volumeControl, "inright");
    Arts::connect(*volumeControl, "outleft", uplink, "left");
    Arts::connect(*volumeControl, "outright", uplink, "right");

    volumeControl->scaleFactor(.1);

    kdDebug() << "Scale Factor: " << volumeControl->scaleFactor() << endl;
  }
  else {
    kdDebug() << "!!! Could not initialize volume control!!!" << endl;
  }
  
}
===

This is *very* similar to what is in knotify.  It just doesn't do anything.  
It claims to be playing the file and then doesn't.  If I comment out this 
block, everything works fine.

I was able to get things working as:

===
volumeControlId = server->outstack().insertBottom(*volumeControl, "Volume");
===

I just don't know what to do next.  Thanks guys!

-Scott

On Wednesday 20 February 2002 06:29 pm, Carsten Pfeiffer wrote:
> On Tue, Feb 19, 2002 at 11:35:31PM -0500, Scott Wheeler wrote:
> > In my application, QTagger, which I'm in the process of porting to KDE 3
> > based on some stuff I got from the list a few months ago, I'm now able to
> > play, pause, stop and seek using SimpleSoundServer.  The only other
> > feature that I'd really like to add is the ability to change the volume
> > of a play object.
> >
> > So, what's the easiest/best way to do this?  If there's documentation
> > that I'm missing or a good example out there, just point me to that. 
> > Unfortunately the Noatun source isn't exactly a nice crash course in aRts
> > programming. :-(
>
> Not sure if it works with SimpleSoundServer as well, but you could have a
> look at kdelibs/arts/knotify/knotify.cpp for volume control.

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