Inside Macintosh: QuickTime /

Chapter 2 - Movie Toolbox / Movie Toolbox Reference

Functions That Modify Movie Properties / Working With Data References

GetMediaDataRefCount

The GetMediaDataRefCount function allows your application to determine the number of data references in a media.

pascal OSErr GetMediaDataRefCount (Media theMedia, short *count); 

theMedia

Specifies the media for this operation. Your application obtains this media identifier from such Movie Toolbox functions as NewTrackMedia and GetTrackMedia (described on page 2-138 and page 2-190, respectively).

count

Contains a pointer to a field that is to receive the number of data references in the media.

DESCRIPTION

The count of references in a media corresponds to the maximum index value of any reference in the media. You can use this value to control a loop in which you retrieve all of a media's data references, using the GetMediaDataRef function, which is described in the next section.

ERROR CODES

invalidMedia

-2008

This media is corrupted or invalid