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Re: Time signature and meta events in MusicSequence
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Re: Time signature and meta events in MusicSequence


  • Subject: Re: Time signature and meta events in MusicSequence
  • From: William Stewart <email@hidden>
  • Date: Tue, 30 Mar 2004 10:10:41 -0800

The TimeSig events that are parsed from a MIDI file are put into the
tempo track - so you'd need to look there

Bill

On 29/03/2004, at 11:31 PM, A. Le Flanchec wrote:

> Hello,
>
> I am currently taking a look at the MusicSequence API. I have some
> troubles reading meta events from standard MIDI Files. I don't get any
> time signature meta event whatever I do... I checked my SMF in several
> sequencers and all time signatures are there... What could I be doing
> wrong ?
>
> Below is the code I use.
>
> Maybe it is related to the fact that I'm still under 0X 10.2.7 ?
>
> Thank you in advance !
>
> Vincent Le Flanchec
>
>
>
> {
> MusicSequence sequenceMIDI;
>
> int i = 0;
>
> //Initializing the musicSequence
> char *filePath ="/Users/liris/bancal.mid";
> OSStatus result = noErr;
> FSRef fsRef;
>
> result = FSPathMakeRef ((const UInt8*)filePath, &fsRef, 0);
> result = NewMusicSequence(&sequenceMIDI);
> FSSpec fsSpec;
> result = PathToFSSpec (filePath, &fsSpec);
> result = MusicSequenceLoadSMF (sequenceMIDI, &fsSpec);
>
>
> //preparing for reading events
> UInt32 MIDITrackNumber;
> MusicSequenceGetTrackCount (sequenceMIDI, &MIDITrackNumber);
> BOOL hasCurrentEvent;
> MusicTimeStamp myTimeStamp;
> MusicEventType myEventType;
> const void * myData;
>
> UInt32 MIDIDataSize;
>
> //Reading events
> while (i < MIDITrackNumber)
> {
> NSLog(@"trackNumber = %i", i);
> MusicTrack track;
> MusicSequenceGetIndTrack(sequenceMIDI, i, &track);
> MusicEventIterator iter = 0;
> NewMusicEventIterator (track, &iter);
>
> MusicEventIteratorHasCurrentEvent (iter, &hasCurrentEvent);
>
> while (hasCurrentEvent)
> {
>
> MusicEventIteratorGetEventInfo(iter,&myTimeStamp,&myEventType,
> &myData,
> &MIDIDataSize);
> MusicEventIteratorNextEvent(iter);
> MusicEventIteratorHasCurrentEvent (iter,
> &hasCurrentEvent);
> NSLog(@"timestamp = %f eventype %i", myTimeStamp,
> myEventType);
>
> if (myEventType == kMusicEventType_Meta)
> {
> NSLog(@" metatype %d",
> ((MIDIMetaEvent*)myData)->metaEventType);
> }
>
> }
>
> if (iter) DisposeMusicEventIterator (iter);
> ++i;
> }
> }
>
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References: 
 >Time signature and meta events in MusicSequence (From: "A. Le Flanchec" <email@hidden>)

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