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MusicSequencerSetUserCallback doesn't work
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MusicSequencerSetUserCallback doesn't work

Hello List,


I am trying to set up the MusicSequencerUserCallback specified in MusicPlayer. The following is my implementation...


MusicSequenceUserCallback CallbackTest::getUserCallback() {

return &hit;

}


void CallbackTest::hit ( void *inClientData,

  MusicSequence inSequence,

  MusicTrack inTrack,

  MusicTimeStamp inEventTime,

  const MusicEventUserData *inEventData,

  MusicTimeStamp inStartSliceBeat,

  MusicTimeStamp inEndSliceBeat)

{

printf ("hit call back");

}


        

In the main function, I create a Track with an arbitrary event to test if the call back would work 


        MusicTrack inTrack;

        ParameterEvent e;

e.parameterID = kAudioUnitProperty_ScheduledFileRegion;

e.scope = kAudioUnitScope_Global;

e.element = 0;

e.value = 5;

MusicTrackNewParameterEvent(inTrack, 5, &e);

        MusicPlayerSetTime(inPlayer, 0.0);

MusicPlayerPreroll(inPlayer);

And I register the callback here...

MusicSequenceSetUserCallback(inSequence, getUserCallback(), NULL);

MusicPlayerStart(inPlayer);



However, my custom 'hit' callback function doesn't get called. Is there anything wrong with my setting? Could anyone please give me a simple example to get this call back work? Could not find any example anywhere... Thank you!

mf


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