QuickTime 4 Reference

Creating a Media Time Table

Listing 18 illustrates how to use the MakeMediaTimeTable function to create a time table for media.

Listing 18 Creating a time table for media



 
OSErr       theErr = noErr;

WindowPtr   movieWindow = nil;

Movie       theMovie = nil;

Track       theTrack;

Media       theMedia;

long        trackCount,

            trackIndex,

            retDataRefSkew;

TimeValue   startTime,

            endTime,

            timeIncrement;

short       firstDataRefIndex,

            lastDataRefIndex;

Handle      offsets,

            offsetsSet [32];



err = GetDisplayedMovie (&movieWindow, &theMovie);



firstDataRefIndex = -1;

lastDataRefIndex = -1;

        

trackCount = GetMovieTrackCount (theMovie);

            

for (trackIndex = 1; trackIndex <= trackCount; trackIndex++)

{

    theTrack = GetMovieIndTrack (theMovie, trackIndex);

    theMedia = GetTrackMedia (theTrack);

    offsets = NewHandle (0);

    offsetsSet [trackIndex - 1] = offsets;

    startTime = GetTrackOffset (theTrack);

    startTime = TrackTimeToMediaTime (startTime, theTrack);

    endTime = GetTrackDuration (theTrack);

    endTime = TrackTimeToMediaTime (endTime, theTrack);

    timeIncrement = GetMediaTimeScale (theMedia);

    err = MakeMediaTimeTable (theMedia, (long **) offsets, 

                startTime, endTime, timeIncrement, firstDataRefIndex,

                lastDataRefIndex, &retDataRefSkew);

}



// dispose handles

for (trackIndex = 1; trackIndex <= trackCount; trackIndex++)

{

    DisposeHandle (offsetsSet [trackIndex - 1]);

}