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;
}
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You can still play these files by calling GetResource and PlaySnd if you wish.
[Sep 22 2000]
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