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Importing Sys 7 Snds


Q: I'm using standard Movie Toolbox APIs such as OpenMovieFile, NewMovieFromFile, and StartMovie to support simple media playback within my application. Although this is very easy and versatile, I can't get Macintosh standard system sound files to work. Can I make QuickTime play these sound files for me or do I have to use the Sound Manager directly?

A: "System 7 sound files" are files with the file type 'sfil' and contain a 'snd ' sound resource. QuickTime can import these files, but it can't import them in-place. You need a new place to put the extracted sound samples.

One way to accomplish this task is to create a handle data reference and import the samples into that handle. Here's an example showing how you might do it:

// This routine will return an imported 'snd ' as a QuickTime Movie
// Error checking has been removed for the sake of convenience
// Parameters: inFile - file to import
//             inSoundDataH - an already allocated zero sized handle
// Returns:    New Imported Sound Movie or 0
Movie System7SoundToMovie(const FSSpec *inFile, Handle inSoundDataH)
{
  Movie theMovie = 0;
  FInfo fndrInfo;

  OSErr err = noErr;

  FSpGetFInfo(inFile, &fndrInfo);
  if (kQTFileTypeSystemSevenSound == fndrInfo.fdType) {

    // QuickTime can't import these files in place, but that's ok,
    // we just need a new place to put this stuff

    Handle hDataRef = NULL;
    MovieImportComponent theImporter = 0;
    long ignore;

    // Create a movie.
    theMovie = NewMovie(newMovieActive);

    // Build the data ref. -- create a Handle-sized Handle to hold the real Handle.
    PtrToHand(&inSoundDataH, &hDataRef, sizeof(Handle));

    // Set where the data will be written when added to a movie
    // This reference points to the passed in handle which will be resized
    // appropriately by the call to MovieImportFile
    SetMovieDefaultDataRef(theMovie, hDataRef, HandleDataHandlerSubType);

    // Do the import
    OpenADefaultComponent(MovieImportType,
          kQTFileTypeSystemSevenSound, &theImporter);
    MovieImportFile(theImporter, inFile, theMovie,
          NULL, NULL, 0, NULL, 0, &ignore);
    CloseComponent(theImporter);

    // Don't need the dataRef anymore but don't dispose
    // of the sound data handle until
    // after the the movie has been disposed or very bad
    // things will happen!
    DisposeHandle(hDataRef);
  }

  return theMovie;
}

You can still play these files by calling GetResource and PlaySnd if you wish.


[Sep 22 2000]


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