//////////
//
//	File:		QTUtilities.c
//
//	Contains:	Some utilities for working with QuickTime movies.
//				All utilities start with the prefix "QTUtils_".
//
//	Written by:	Tim Monroe
//				Based on the DTSQTUtilities package by Apple DTS.
//				This began as essentially a subset of that package, revised for cross-platform use.
//
//	Copyright:	© 1996-1999 by Apple Computer, Inc., all rights reserved.
//
//	Change History (most recent first):
//
//	   <35>	 	09/29/00	rtm		added QTUtils_IsAutoPlayMovie
//	   <34>	 	04/28/00	rtm		fixed bug in QTUtils_AddUserDataTextToMovie (had a script system, not a region code)
//	   <33>	 	03/08/00	rtm		removed QTUtils_SaveMovie and QTUtils_PrintMoviePICT
//	   <32>	 	03/02/00	rtm		added QTUtils_SelectNoneMovie
//	   <31>	 	01/10/00	rtm		tweaked QTUtils_IsQuickTimeInstalled
//	   <30>	 	12/20/99	rtm		reworked QTUtils_IsMovieFile, to first test for files of type kQTFileTypeMovie
//	   <29>	 	12/09/99	rtm		added QTUtils_PutControllerBarOnTop
//	   <28>	 	12/08/99	rtm		reworked controller button functions to support custom buttom (its mcFlags constant
//									is a "Use" constant and not a "Suppress" constant)
//	   <27>	 	11/26/99	rtm		added endian adjustments to _GetMovieFileLoopingInfo and _GetWindowPositionFromFile
//	   <26>	 	11/17/99	rtm		added QTUtils_GetWindowPositionFromFile
//	   <25>	 	05/19/99	rtm		removed QTUtils_GetMovie
//	   <24>	 	05/10/99	rtm		added QTUtils_UpdateMovieVolumeSetting
//	   <23>	 	03/22/99	rtm		updated connection speed code to use constants/data types now in Movies.h
//	   <22>	 	03/11/99	rtm		moved _GetControllerType and _SetControllerType from QTVRUtilities to here;
//									added QTUtils_ChangeControllerType
//	   <21>	 	02/03/99	rtm		moved non-QTVR-specific utilities from QTVRUtilities to here
//	   <20>	 	01/26/99	rtm		added QTUtils_ConvertCToPascalString; removed "\p" from any constant strings
//	   <19>	 	01/25/99	rtm		#define'd away QTUtils_GetUsersContentRating and siblings, since content rating
//									capability is not in latest feature set
//	   <18>	 	12/09/98	rtm		added QTUtils_GetUsersContentRating
//	   <17>	 	11/18/98	rtm		added QTUtils_GetFrameCount
//	   <16>	 	10/27/98	rtm		added QTUtils_MakeMovieLoop
//	   <15>	 	09/14/98	rtm		added QTUtils_GetUsersConnectionSpeed and QTUtils_SetUsersConnectionSpeed
//	   <14>	 	06/24/98	rtm		added QTUtils_GetMaxWindowDepth and QTUtils_GetMaxScreenDepth
//	   <13>	 	06/04/98	rtm		added QTUtils_DeleteAllReferencesToTrack
//	   <12>	 	05/28/98	rtm		added some typecasting to minimize MSDev compiler warnings
//	   <11>	 	05/19/98	rtm		added QTUtils_MovieHasTimeCodeTrack
//	   <10>	 	05/04/98	rtm		added QTUtils_GetTrackName, QTUtils_SetTrackName, QTUtils_MakeTrackNameByType,
//									QTUtils_IsImageFile, and QTUtils_IsMovieFile
//	   <9>	 	02/28/98	rtm		fixed QTUtils_GetMovieFileLoopingInfo and the like
//	   <8>	 	01/14/98	rtm		added QTUtils_ConvertFloatToBigEndian
//	   <7>	 	12/19/97	rtm		added QTUtils_AddUserDataTextToMovie and associated routines;
//									added QTUtils_GetMovieFileLoopingInfo and the like
//	   <6>	 	11/06/97	rtm		added QTUtils_MakeSampleDescription
//	   <5>	 	10/29/97	rtm		modified QTUtils_IsMediaTypeInMovie and similar routines to use GetMovieIndTrackType
//	   <4>	 	10/27/97	rtm		added QTUtils_HasQuickTimeVideoEffects
//	   <3>	 	10/17/97	rtm		added QTUtils_MovieHasSoundTrack
//	   <2>	 	09/23/97	rtm		added endian adjustment to QTUtils_PrintMoviePICT
//	   <1>	 	09/10/97	rtm		first file
//	   
//////////

//////////
//
// header files
//
//////////

#ifndef __QTUtilities__
#include "QTUtilities.h"


///////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// General utilities.
//
// Use these functions to get information about the availability/features of QuickTime or other services.
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////

//////////
//
// QTUtils_TrapAvailable
// Check to see whether a given trap is implemented. This is based on IM: Operating System Utilities (p. 8-22).
//
//////////

#if TARGET_OS_MAC && !TARGET_API_MAC_CARBON
Boolean QTUtils_TrapAvailable (short theTrapWord)
{
	TrapType		myTrapType;
	short			myNumToolboxTraps;
	
	// determine whether this is a Toolbox or an Operating System trap
	if ((theTrapWord & 0x0800) > 0)
		myTrapType = ToolTrap;
	else
		myTrapType = OSTrap;

	if (myTrapType == ToolTrap) {
		theTrapWord = theTrapWord & 0x07FF;
		
		if (NGetTrapAddress(_InitGraf, ToolTrap) == NGetTrapAddress(0xAA6E, ToolTrap))
			myNumToolboxTraps = 0x0200;
		else
			myNumToolboxTraps = 0x0400;
			
		if (theTrapWord >= myNumToolboxTraps)
			theTrapWord = _Unimplemented;
	}

	return(NGetTrapAddress(theTrapWord, myTrapType) != NGetTrapAddress(_Unimplemented, ToolTrap));
}
#endif


//////////
//
// QTUtils_IsQuickTimeInstalled
// Is QuickTime installed?
//
//////////

Boolean QTUtils_IsQuickTimeInstalled (void) 
{
	long		myAttrs;
	OSErr 		myErr = noErr;

	myErr = Gestalt(gestaltQuickTime, &myAttrs);

	return(myErr == noErr);
}


//////////
//
// QTUtils_IsQuickTimeCFMInstalled
// Are the QuickTime CFM libraries installed?
//
//////////

#if TARGET_CPU_PPC
Boolean QTUtils_IsQuickTimeCFMInstalled (void) 
{
	Boolean 	myQTCFMAvail = false;
	long		myAttrs;
	OSErr 		myErr = noErr;

	// test whether the PowerPC QuickTime glue library is present
	myErr = Gestalt(gestaltQuickTimeFeatures, &myAttrs);
	if (myErr == noErr)
		if (myAttrs & (1L << gestaltPPCQuickTimeLibPresent))
			myQTCFMAvail = true;

	// test whether a function is available (the library is not moved from the Extension folder);
	// this is the trick to be used when testing if a function is available via CFM
	if (!CompressImage)
		myQTCFMAvail = false;     

	return(myQTCFMAvail);
}
#endif


//////////
//
// QTUtils_GetQTVersion
// Get the version of QuickTime installed.
// The high-order word of the returned long integer contains the version number,
// so you can test a version like this:
//
//		if (((QTUtils_GetQTVersion() >> 16) & 0xffff) >= 0x0210)		// we require QT 2.1 or greater
//			return;
//
//////////

long QTUtils_GetQTVersion (void) 
{
	long	 	myVersion = 0L;
	OSErr 		myErr = noErr;

	myErr = Gestalt(gestaltQuickTime, &myVersion);
	if (myErr == noErr)
		return(myVersion);
	else
		return(0L);
}


//////////
//
// QTUtils_HasQuickTimeVideoEffects
// Does the installed version of QuickTime support video effects?
//
// Note: this is a pretty cheesy way of determining whether video effects are available.
//
//////////

Boolean QTUtils_HasQuickTimeVideoEffects (void) 
{
	return(((QTUtils_GetQTVersion() >> 16) & 0xffff) >= kQTVideoEffectsMinVers);
}


//////////
//
// QTUtils_HasFullScreenSupport
// Does the installed version of QuickTime support the full-screen routines?
//
// Note: this is a pretty cheesy way of determining whether full-screen routines are available.
//
//////////

Boolean QTUtils_HasFullScreenSupport (void) 
{
	return(((QTUtils_GetQTVersion() >> 16) & 0xffff) >= kQTFullScreenMinVers);
}


//////////
//
// QTUtils_HasWiredSprites
// Does the installed version of QuickTime support wired sprites?
//
// Note: this is a pretty cheesy way of determining whether wired sprites are available.
//
//////////

Boolean QTUtils_HasWiredSprites (void) 
{
	return(((QTUtils_GetQTVersion() >> 16) & 0xffff) >= kQTWiredSpritesMinVers);
}


//////////
//
// QTUtils_IsQTVRMovie
// Is the specified movie a QTVR movie?
//
// WARNING: This function is intended for use ONLY when you want to determine if you've got a QTVR movie
// but you don't want to use the QuickTime VR API (perhaps QTVR isn't installed...). The preferred way to
// determine if a movie is a QTVR movie is to call QTVRGetQTVRTrack and then QTVRGetQTVRInstance; if you
// get back a non-NULL instance, you've got a QTVR movie.
//
//////////

Boolean QTUtils_IsQTVRMovie (Movie theMovie) 
{
	Boolean			myIsQTVRMovie = false;
	OSType			myType;
	
	// QTVR movies have a special piece of user data identifying the movie controller type
	myType = QTUtils_GetControllerType(theMovie);
	
	if ((myType == kQTVRQTVRType) || (myType == kQTVROldPanoType) || (myType == kQTVROldObjectType))
		myIsQTVRMovie = true; 
		
	return(myIsQTVRMovie);
}


//////////
//
// QTUtils_IsStreamedMovie
// Is the specified movie a streamed movie?
//
//////////

Boolean QTUtils_IsStreamedMovie (Movie theMovie) 
{
	return(GetMovieIndTrackType(theMovie, 1, kQTSStreamMediaType, movieTrackMediaType | movieTrackEnabledOnly) != NULL);
}


//////////
//
// QTUtils_IsAutoPlayMovie
// Get the autoplay state of a movie file.
//
// A movie file can have information about its autoplay state in a user data item of type 'play'.
// If the movie doesn't contain an item of this type, then we'll assume that it doesn't autoplay.
// If it does contain an item of this type, then the item data (a Boolean) is 0 for normal play
// and 1 for autoplay.
//
//////////

Boolean QTUtils_IsAutoPlayMovie (Movie theMovie)
{
	UserData		myUserData = NULL;
	Boolean			myAutoPlay = false;
	OSErr			myErr = paramErr;

	// make sure we've got a movie
	if (theMovie == NULL)
		return(myAutoPlay);
		
	// get the movie's user data list
	myUserData = GetMovieUserData(theMovie);
	if (myUserData != NULL) {
		myErr = GetUserDataItem(myUserData, &myAutoPlay, sizeof(myAutoPlay), FOUR_CHAR_CODE('play'), 0);
		if (myErr != noErr)
			myAutoPlay = false;
	}

	return(myAutoPlay);
}


///////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Controller bar utilities.
//
// Use these functions to manipulate the controller bar, its buttons, and the help text displayed in it.
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////

//////////
//
// QTUtils_IsControllerBarVisible
// Is the controller bar currently visible?
//
//////////

Boolean QTUtils_IsControllerBarVisible (MovieController theMC) 
{
	return((Boolean)MCGetVisible(theMC));
}


//////////
//
// QTUtils_GetControllerBarHeight
// Return the height of the controller bar displayed by the movie controller.
//
// Note that MCGetControllerBoundsRect returns the rectangle of bar and movie, if attached;
// so we need to detach the controller bar first.
//
//////////

short QTUtils_GetControllerBarHeight (MovieController theMC) 
{
	Boolean		wasAttached = false;
	Rect		myRect;
	
	// if the controller bar is attached, detach it (and remember we did so)
	if (MCIsControllerAttached(theMC) == 1) {
		wasAttached = true;
		MCSetControllerAttached(theMC, false);
	}
	
	// get the rectangle of the controller
	MCGetControllerBoundsRect(theMC, &myRect);
	
	// now reattach the controller bar, if it was originally attached
	if (wasAttached)
		MCSetControllerAttached(theMC, true);
	
	return(myRect.bottom - myRect.top);
}


//////////
//
// QTUtils_HideControllerBar
// Hide the controller bar provided by the movie controller.
//
//////////

void QTUtils_HideControllerBar (MovieController theMC) 
{
	MCSetVisible(theMC, false);
}


//////////
//
// QTUtils_ShowControllerBar
// Show the controller bar provided by the movie controller.
//
//////////

void QTUtils_ShowControllerBar (MovieController theMC) 
{
	MCSetVisible(theMC, true);
}


//////////
//
// QTUtils_ToggleControllerBar
// Toggle the state of the controller bar provided by the movie controller.
//
//////////

void QTUtils_ToggleControllerBar (MovieController theMC) 
{
	if (QTUtils_IsControllerBarVisible(theMC))
		QTUtils_HideControllerBar(theMC);
	else
		QTUtils_ShowControllerBar(theMC);
}


//////////
//
// QTUtils_PutControllerBarOnTop
// Put the movie controller bar at the top of the movie window.
//
//////////

void QTUtils_PutControllerBarOnTop (MovieController theMC) 
{
	if (theMC == NULL)
		return;
		
	if (MCIsControllerAttached(theMC) == 1) {
		Rect		myMCRect;
		Rect		myMovieRect;
						
		MCGetControllerBoundsRect(theMC, &myMCRect);
		myMovieRect = myMCRect;
		myMCRect.bottom = myMCRect.top + QTUtils_GetControllerBarHeight(theMC);
		myMovieRect.top = myMCRect.bottom + 1;
		
		MCSetControllerAttached(theMC, false);
		
		MCPositionController(theMC, &myMovieRect, &myMCRect, 0L);
	}
}


//////////
//
// QTUtils_HideControllerButton
// Hide the specified button in the controller bar.
//
// Some explanation is probably useful here: the first thing to understand is that every VR movie has 
// TWO sets of movie controller flags: (1) a set of "control flags" and (2) a set of "explicit flags".
//
// The control flags work as documented in IM: QuickTime Components (pp. 2-20f) and in VRPWQTVR2.0 (pp. 2-23f):
// if a bit in the set of control flags is set (that is, equal to 1), then the associated action or property is
// enabled. For instance, bit 17 (mcFlagQTVRSuppressZoomBtns) means to suppress the zoom buttons. So, if that
// bit is set in a VR movie's control flags, the zoom buttons are NOT displayed. If that bit is clear, the zoom
// buttons are displayed.
//
// However, the QuickTime VR movie controller sometimes suppresses buttons even when those buttons 
// have not been explicitly suppressed in the control flags. For example, if a particular VR movie does not
// contain a sound track, then the movie controller automatically suppresses the speaker/volume button. Likewise,
// if a movie does contain a sound track, then the speaker/volume button is automatically displayed, again without
// regard to the actual value of bit 2 in the control flags.
//
// This might not be what you'd like to happen. For instance, if your application is playing a sound that it
// loaded from a sound resource, you might want the user to be able to adjust the sound's volume using the volume
// control. To do that, you need a way to *force* the speaker/volume button to appear. For this reason, the
// explicit flags were introduced.
//
// The explicit flags indicate which bits in the control flags are to be used explicitly (that is, taken at
// face value). If a certain bit is set in a movie's explicit flags, then the corresponding bit in the control
// flags is interpreted as the desired setting for the feature (and the movie controller will not attempt to
// do anything "clever"). In other words, if bit 17 is set in a movie's explicit flags and bit 17 is clear in
// that movie's control flags, then the zoom buttons are displayed. Similarly, if bit 2 is set in a movie's 
// explicit flags and bit 2 is clear in that movie's control flags, then the speaker/volume button is displayed,
// whether or not the movie contains a sound track.
//
// The final thing to understand: to get or set a bit in a movie's explicit flags, you must set the flag 
// mcFlagQTVRExplicitFlagSet in your call to mcActionGetFlags or mcActionSetFlags. To get or set a bit in a 
// movie's control flags, you must clear the flag mcFlagQTVRExplicitFlagSet in your call to mcActionGetFlags 
// or mcActionSetFlags. Note that when you use the defined constants to set values in the explicit flags, the 
// constant names might be confusing. For instance, setting the bit mcFlagSuppressSpeakerButton in a movie's
// explicit flags doesn't cause the speaker to be suppressed; it just means: "use the actual value of the
// mcFlagSuppressSpeakerButton bit in the control flags".
//
// Whew! Any questions? Okay, then now you'll understand how to hide or show a button in the controller bar:
// set the appropriate explicit flag to 1 and set the corresponding control flag to the desired value. And
// you'll understand how to let the movie controller do its "clever" work: clear the appropriate explicit flag.
//
// There is one final twist to this story: the mcFlag bit for the custom controller button indicates that the
// custom button should be shown, not (like all other button flags) that the button should be suppressed. So
// we need to treat the custom button specially. Sigh.
//
//////////

void QTUtils_HideControllerButton (MovieController theMC, long theButton) 
{
	long	myControllerFlags;
	
	// handle the custom button separately
	if (theButton == kQTUtilsCustomButton) {
		MCDoAction(theMC, mcActionGetFlags, &myControllerFlags);
		MCDoAction(theMC, mcActionSetFlags, (void *)(myControllerFlags & ~theButton));
	} else {
		// get the current explicit flags and set the explicit flag for the specified button
		myControllerFlags = mcFlagQTVRExplicitFlagSet;
		MCDoAction(theMC, mcActionGetFlags, &myControllerFlags);
		MCDoAction(theMC, mcActionSetFlags, (void *)((myControllerFlags | theButton) | mcFlagQTVRExplicitFlagSet));
		
		// get the current control flags and set the suppress flag for the specified button
		myControllerFlags = 0;
		MCDoAction(theMC, mcActionGetFlags, &myControllerFlags);
		MCDoAction(theMC, mcActionSetFlags, (void *)((myControllerFlags | theButton) & ~mcFlagQTVRExplicitFlagSet));
	}
}


//////////
//
// QTUtils_ShowControllerButton
// Show the specified button in the controller bar.
//
//////////

void QTUtils_ShowControllerButton (MovieController theMC, long theButton) 
{
	long	myControllerFlags;
	
	// handle the custom button separately
	if (theButton == kQTUtilsCustomButton) {
		MCDoAction(theMC, mcActionGetFlags, &myControllerFlags);
		MCDoAction(theMC, mcActionSetFlags, (void *)(myControllerFlags | theButton));
	} else {
		// get the current explicit flags and set the explicit flag for the specified button
		myControllerFlags = mcFlagQTVRExplicitFlagSet;
		MCDoAction(theMC, mcActionGetFlags, &myControllerFlags);
		MCDoAction(theMC, mcActionSetFlags, (void *)((myControllerFlags | theButton) | mcFlagQTVRExplicitFlagSet));
		
		// get the current control flags and clear the suppress flag for the specified button
		myControllerFlags = 0;
		MCDoAction(theMC, mcActionGetFlags, &myControllerFlags);
		MCDoAction(theMC, mcActionSetFlags, (void *)(myControllerFlags & ~theButton & ~mcFlagQTVRExplicitFlagSet));
	}
}


//////////
//
// QTUtils_ToggleControllerButton
// Toggle the state of the specified button in the controller bar.
//
//////////

void QTUtils_ToggleControllerButton (MovieController theMC, long theButton) 
{
	if (QTUtils_IsControllerButtonVisible(theMC, theButton))	
		QTUtils_HideControllerButton(theMC, theButton);
	else
		QTUtils_ShowControllerButton(theMC, theButton);
}


//////////
//
// QTUtils_ResetControllerButton
// Remove any explicit setting of the specified button in the controller bar.
// (This allows the QuickTime VR movie controller to be as clever as it knows how to be.)
//
//////////

void QTUtils_ResetControllerButton (MovieController theMC, long theButton) 
{
	long	myControllerFlags = mcFlagQTVRExplicitFlagSet;
	
	// get the current explicit flags and clear the explicit flag for the specified button
	MCDoAction(theMC, mcActionGetFlags, &myControllerFlags);
	MCDoAction(theMC, mcActionSetFlags, (void *)((myControllerFlags | theButton) & ~mcFlagQTVRExplicitFlagSet));
}


//////////
//
// QTUtils_IsControllerButtonVisible
// Is the specified button in the controller bar currently visible?
//
//////////

Boolean QTUtils_IsControllerButtonVisible (MovieController theMC, long theButton) 
{
	long		myControllerFlags;

	// get the current control flags
	myControllerFlags = 0;
	MCDoAction(theMC, mcActionGetFlags, &myControllerFlags);

	// the speaker button requires some additional logic, because the QTVR movie controller treats it special;
	// be advised that that controller's special behavior could change in the future, so you might need to tweak this code
	if (theButton == mcFlagSuppressSpeakerButton) {
		long	myExplicitFlags;
		
		// get the current explicit flags
		myExplicitFlags = mcFlagQTVRExplicitFlagSet;
		MCDoAction(theMC, mcActionGetFlags, &myExplicitFlags);
	
		// the speaker button is not showing if the movie has no sound track and the explicit flag is not set
		if (!QTUtils_MovieHasSoundTrack(MCGetMovie(theMC)) && !(myExplicitFlags & theButton))
			return(false);
	}
	
	// the custom button requires some different treatment, since it doesn't have a "Suppress" button constant
	if (theButton == mcFlagsUseCustomButton)
		if (myControllerFlags & theButton)
			return(true);
		else
			return(false);
	
	// examine the suppress flag for the specified button
	if (myControllerFlags & theButton)				// if the button is currently suppressed...
		return(false);
	else
		return(true);
}


///////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Media utilities.
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////

//////////
//
// QTUtils_IsMediaTypeInMovie
// Determine whether a specific media type is in a movie.
// 
//////////

Boolean QTUtils_IsMediaTypeInMovie (Movie theMovie, OSType theMediaType)
{
	return(GetMovieIndTrackType(theMovie, 1, theMediaType, movieTrackMediaType | movieTrackEnabledOnly) != NULL);
}


//////////
//
// QTUtils_MovieHasTimeCodeTrack
// Determine whether a movie contains a timecode track.
// 
//////////

Boolean QTUtils_MovieHasTimeCodeTrack (Movie theMovie)
{
	return(GetMovieIndTrackType(theMovie, 1, TimeCodeMediaType, movieTrackMediaType) != NULL);
}


//////////
//
// QTUtils_MovieHasSoundTrack
// Determine whether a movie contains a sound track.
// 
//////////

Boolean QTUtils_MovieHasSoundTrack (Movie theMovie)
{
	return(GetMovieIndTrackType(theMovie, 1, AudioMediaCharacteristic, movieTrackCharacteristic | movieTrackEnabledOnly) != NULL);
}


//////////
//
// QTUtils_GetSoundMediaHandler
// Return the sound media handler for a movie.
// 
//////////

MediaHandler QTUtils_GetSoundMediaHandler (Movie theMovie)
{
	Track		myTrack;
	Media		myMedia;

	myTrack = GetMovieIndTrackType(theMovie, 1, AudioMediaCharacteristic, movieTrackCharacteristic | movieTrackEnabledOnly);
	if (myTrack != NULL) {
		myMedia = GetTrackMedia(myTrack);
		return(GetMediaHandler(myMedia));
	} 
		
	return(NULL);
}


//////////
//
// QTUtils_UpdateMovieVolumeSetting
// Update the preferred volume setting of the specified movie.
// 
//////////

OSErr QTUtils_UpdateMovieVolumeSetting (Movie theMovie)
{
	short			myPrefVolume;
	short			myCurrVolume;
	OSErr			myErr = noErr;
	
	myPrefVolume = GetMoviePreferredVolume(theMovie);
	myCurrVolume = GetMovieVolume(theMovie);
	myCurrVolume = abs(myCurrVolume);
	
	if (myPrefVolume != myCurrVolume) {
		SetMoviePreferredVolume(theMovie, myCurrVolume);
		myErr = GetMoviesError();
	}
	
	return(myErr);
}


//////////
//
// QTUtils_SelectAllMovie
// Select the entire movie associated with the specified movie controller.
// 
//////////

OSErr QTUtils_SelectAllMovie (MovieController theMC)
{
	TimeRecord			myTimeRecord;
	Movie 				myMovie = NULL;
	ComponentResult		myErr = noErr;
	
	if (theMC == NULL)
		return(paramErr);
	
	myMovie = MCGetMovie(theMC);
	if (myMovie == NULL)
		return(paramErr);
	
	myTimeRecord.value.hi = 0;
	myTimeRecord.value.lo = 0;
	myTimeRecord.base = 0;
	myTimeRecord.scale = GetMovieTimeScale(myMovie);	
	myErr = MCDoAction(theMC, mcActionSetSelectionBegin, &myTimeRecord);
	if (myErr != noErr)
		return((OSErr)myErr);
	
	myTimeRecord.value.hi = 0;
	myTimeRecord.value.lo = GetMovieDuration(myMovie);	
	myTimeRecord.base = 0;
	myTimeRecord.scale = GetMovieTimeScale(myMovie);	
	myErr = MCDoAction(theMC, mcActionSetSelectionDuration, &myTimeRecord);
	
	return((OSErr)myErr);
}


//////////
//
// QTUtils_SelectNoneMovie
// Select none of the movie associated with the specified movie controller.
// 
//////////

OSErr QTUtils_SelectNoneMovie (MovieController theMC)
{
	TimeRecord			myTimeRecord;
	Movie 				myMovie = NULL;
	ComponentResult		myErr = noErr;
	
	if (theMC == NULL)
		return(paramErr);
	
	myMovie = MCGetMovie(theMC);
	if (myMovie == NULL)
		return(paramErr);
	
	myTimeRecord.value.hi = 0;
	myTimeRecord.value.lo = 0;	
	myTimeRecord.base = 0;
	myTimeRecord.scale = GetMovieTimeScale(myMovie);	
	myErr = MCDoAction(theMC, mcActionSetSelectionDuration, &myTimeRecord);
	
	return((OSErr)myErr);
}


//////////
//
// QTUtils_MakeSampleDescription
// Return a new image description with default and specified values.
// 
//////////

ImageDescriptionHandle QTUtils_MakeSampleDescription (long theEffectType, short theWidth, short theHeight)
{
	ImageDescriptionHandle		mySampleDesc = NULL;

	// create a new sample description
	mySampleDesc = (ImageDescriptionHandle)NewHandleClear(sizeof(ImageDescription));
	if (mySampleDesc == NULL)
		return(NULL);
	
	// fill in the fields of the sample description
	(**mySampleDesc).idSize = sizeof(ImageDescription);
	(**mySampleDesc).cType = theEffectType;
	(**mySampleDesc).vendor = kAppleManufacturer;
	(**mySampleDesc).temporalQuality = codecNormalQuality;
	(**mySampleDesc).spatialQuality = codecNormalQuality;
	(**mySampleDesc).width = theWidth;
	(**mySampleDesc).height = theHeight;
	(**mySampleDesc).hRes = 72L << 16;
	(**mySampleDesc).vRes = 72L << 16;
	(**mySampleDesc).dataSize = 0L;
	(**mySampleDesc).frameCount = 1;
	(**mySampleDesc).depth = 24;
	(**mySampleDesc).clutID = -1;
	
	return(mySampleDesc);
}


///////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// User data utilities.
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////

#if CONTENT_RATING_AVAIL
//////////
//
// QTUtils_GetContentRatingFromMovie
// Get the content rating from a movie; return an error if it has none. In any case, return a meaningful
// content rating.
//
//////////

OSErr QTUtils_GetContentRatingFromMovie (Movie theMovie, UInt16 *theRating, UInt32 *theReasons)
{
	UserData					myUserData = NULL;
	QTAltContentRatingRecord	myContentRec;
	OSErr						myErr = paramErr;

	*theRating = kQTContentTVYRating;
	*theReasons = 0L;

	// make sure we've got a movie
	if (theMovie == NULL)
		return(myErr);
		
	// get the movie's user data list
	myUserData = GetMovieUserData(theMovie);
	if (myUserData != NULL) {
		myErr = GetUserDataItem(myUserData, &myContentRec, sizeof(myContentRec), FOUR_CHAR_CODE('crat'), 0);
		if (myErr == noErr) {
			*theRating = EndianU16_BtoN(myContentRec.ratings);
			*theReasons = EndianU32_BtoN(myContentRec.contentType);
		}
	}

	return(myErr);
}


//////////
//
// QTUtils_AddContentRatingToMovie
// Add a content rating to a movie.
//
// A content rating is stored as a user data item that indicates both the general rating
// (for example, TV-MA [mature audiences only]) and any additional information about the
// content (for example, coarse language). Let's call this additional information the
// "reasons" for the rating. Both the rating and the reasons are specified using constants
// in the file MoviesFormat.h.
//
// This function adds the specified content rating to the movie's user data;
// the updated user data is written to the movie file when the movie is next updated
// (by calling UpdateMovieResource).
// 
//////////

OSErr QTUtils_AddContentRatingToMovie (Movie theMovie, UInt16 theRating, UInt32 theReasons)
{
	UserData					myUserData = NULL;
	QTAltContentRatingRecord	myContentRec;
	OSErr						myErr = noErr;

	// get the movie's user data list
	myUserData = GetMovieUserData(theMovie);
	if (myUserData == NULL)
		return(paramErr);
	
	myContentRec.flags = 0;
	myContentRec.contentType = EndianU32_NtoB(theReasons);
	myContentRec.ratings = EndianU16_NtoB(theRating);
	
	// for simplicity, we assume that we want only one content rating in the movie;
	// as a result, we won't worry about overwriting any existing item of that type

	// add the data to the movie's user data
	myErr = SetUserDataItem(myUserData, &myContentRec, sizeof(myContentRec), FOUR_CHAR_CODE('crat'), 0);

	return(myErr);
}
#endif	// #if CONTENT_RATING_AVAIL


//////////
//
// QTUtils_AddUserDataTextToMovie
// Add a user data item, of the specified type, containing the specified text to a movie.
//
// This function adds the specified text to the movie's user data;
// the updated user data is written to the movie file when the movie is next updated
// (by calling UpdateMovieResource).
// 
//////////

OSErr QTUtils_AddUserDataTextToMovie (Movie theMovie, char *theText, OSType theType)
{
	UserData					myUserData = NULL;
	Handle						myHandle = NULL;
	long						myLength = strlen(theText);
	OSErr						myErr = noErr;

	// get the movie's user data list
	myUserData = GetMovieUserData(theMovie);
	if (myUserData == NULL)
		return(paramErr);
	
	// copy the specified text into a new handle
	myHandle = NewHandleClear(myLength);
	if (myHandle == NULL)
		return(MemError());

	BlockMoveData(theText, *myHandle, myLength);

	// for simplicity, we assume that we want only one user data item of the specified type in the movie;
	// as a result, we won't worry about overwriting any existing item of that type....
	//
	// if you need multiple user data items of a given type (for example, a copyright notice
	// in several different languages), you would need to modify this code; this is left as an exercise
	// for the reader....

	// add the data to the movie's user data
	myErr = AddUserDataText(myUserData, myHandle, theType, 1, GetScriptManagerVariable(smRegionCode));

	// clean up
	DisposeHandle(myHandle);
	return(myErr);
}


//////////
//
// QTUtils_AddCopyrightToMovie
// Add a user data item containing the specified copyright text to a movie.
//
//////////

OSErr QTUtils_AddCopyrightToMovie (Movie theMovie, char *theText)
{
	return(QTUtils_AddUserDataTextToMovie(theMovie, theText, kUserDataTextCopyright));
}


//////////
//
// QTUtils_AddMovieNameToMovie
// Add a user data item containing the specified name to a movie.
//
//////////

OSErr QTUtils_AddMovieNameToMovie (Movie theMovie, char *theText)
{
	return(QTUtils_AddUserDataTextToMovie(theMovie, theText, kUserDataTextFullName));
}


//////////
//
// QTUtils_AddMovieInfoToMovie
// Add a user data item containing the specified information to a movie.
//
//////////

OSErr QTUtils_AddMovieInfoToMovie (Movie theMovie, char *theText)
{
	return(QTUtils_AddUserDataTextToMovie(theMovie, theText, kUserDataTextInformation));
}


//////////
//
// QTUtils_GetMovieFileLoopingInfo
// Get the looping state of a movie file.
//
// A movie file can have information about its looping state in a user data item of type 'LOOP'.
// If the movie doesn't contain an item of this type, then we'll assume that it isn't looping.
// If it does contain an item of this type, then the item data (a long integer) is 0 for normal
// looping and 1 for palindrome looping. Accordingly, this function returns the following values
// in the theLoopInfo parameter:
//
//		0 == normal looping
//		1 == palindrome looping
//		2 == no looping
//
// Return an error if the movie has no looping state. In any case, return a meaningful looping state.
//
//////////

OSErr QTUtils_GetMovieFileLoopingInfo (Movie theMovie, long *theLoopInfo)
{
	UserData		myUserData = NULL;
	long			myLoopInfo = kNoLooping;
	OSErr			myErr = paramErr;

	// make sure we've got a movie
	if (theMovie == NULL)
		goto bail;
		
	// get the movie's user data list
	myUserData = GetMovieUserData(theMovie);
	if (myUserData != NULL) {
		myErr = GetUserDataItem(myUserData, &myLoopInfo, sizeof(myLoopInfo), FOUR_CHAR_CODE('LOOP'), 0);
		if (myErr == noErr)
			myLoopInfo = EndianS32_BtoN(myLoopInfo);
	}

bail:
	*theLoopInfo = myLoopInfo;

	return(myErr);
}


//////////
//
// QTUtils_SetMovieFileLoopingInfo
// Set the looping state for a movie file.
//
//////////

OSErr QTUtils_SetMovieFileLoopingInfo (Movie theMovie, long theLoopInfo)
{
	UserData		myUserData = NULL;
    long			myLoopInfo;
    short			myCount = 0;
	OSErr			myErr = paramErr;

	// get the movie's user data
    myUserData = GetMovieUserData(theMovie);
	if (myUserData == NULL)
		goto bail;

	// we want to end up with at most one user data item of type 'LOOP',
	// so let's remove any existing ones
    myCount = CountUserDataType(myUserData, FOUR_CHAR_CODE('LOOP'));
    while (myCount--)
        RemoveUserData(myUserData, FOUR_CHAR_CODE('LOOP'), 1);

	// make sure we're writing big-endian data
	myLoopInfo = EndianU32_NtoB(theLoopInfo);
	
	switch (theLoopInfo) {
		case kNormalLooping:
		case kPalindromeLooping:
			myErr = SetUserDataItem(myUserData, &myLoopInfo, sizeof(long), FOUR_CHAR_CODE('LOOP'), 0);
			break;

		case kNoLooping:
		default:
			myErr = noErr;
			break;
	}

bail:
	return(myErr);
}


//////////
//
// QTUtils_SetLoopingStateFromFile
// Set the looping state for a movie based on the looping information in the movie file.
//
//////////

OSErr QTUtils_SetLoopingStateFromFile (Movie theMovie, MovieController theMC)
{
	long 			myLoopInfo = kNoLooping;
	OSErr			myErr = noErr;

	myErr = QTUtils_GetMovieFileLoopingInfo(theMovie, &myLoopInfo);
	switch (myLoopInfo) {

		case kNormalLooping:
			MCDoAction(theMC, mcActionSetLooping, (void *)true);
			MCDoAction(theMC, mcActionSetLoopIsPalindrome, (void *)false);
			break;

		case kPalindromeLooping:
			MCDoAction(theMC, mcActionSetLooping, (void *)true);
			MCDoAction(theMC, mcActionSetLoopIsPalindrome, (void *)true);
			break;

		case kNoLooping:
		default:
			MCDoAction(theMC, mcActionSetLooping, (void *)false);
			MCDoAction(theMC, mcActionSetLoopIsPalindrome, (void *)false);
			break;
	}

	return(myErr);
}


//////////
//
// QTUtils_MakeMovieLoop
// Set the specified movie to loop.
//
// Based on the function MakeMovieLoop by Kevin Marks.
//
//////////

OSErr QTUtils_MakeMovieLoop (Movie theMovie, Boolean isPalindrome)
{
	TimeBase		myTimeBase = NULL;
	long 			myFlags = 0L;
	OSErr			myErr = paramErr;

	// make sure we've got a movie
	if (theMovie == NULL)
		goto bail;
	
	myErr = noErr;
		
	// set the movie's play hints to enhance looping performance
	SetMoviePlayHints(theMovie, hintsLoop, hintsLoop);
	
	// set the looping flag of the movie's time base
	myTimeBase = GetMovieTimeBase(theMovie);
	myFlags = GetTimeBaseFlags(myTimeBase);
	myFlags |= loopTimeBase;
	
	// set or clear the palindrome flag, depending on the specified setting
	if (isPalindrome)
		myFlags |= palindromeLoopTimeBase;
	else
		myFlags &= ~palindromeLoopTimeBase;
		
	SetTimeBaseFlags(myTimeBase, myFlags);

bail:
	return(myErr);
}


//////////
//
// QTUtils_GetWindowPositionFromFile
// Return, through thePoint, the stored position of the specified movie.
//
// Return an error if the movie has no stored position. In any case, return a meaningful position.
//
//////////

OSErr QTUtils_GetWindowPositionFromFile (Movie theMovie, Point *thePoint)
{
	UserData		myUserData = NULL;
	Point			myPoint = {kDefaultWindowX, kDefaultWindowY};
	OSErr			myErr = paramErr;

	// make sure we've got a movie
	if (theMovie == NULL)
		goto bail;
		
	// get the movie's user data list
	myUserData = GetMovieUserData(theMovie);
	if (myUserData != NULL) {
		myErr = GetUserDataItem(myUserData, &myPoint, sizeof(Point), FOUR_CHAR_CODE('WLOC'), 0);
		if (myErr == noErr) {
			myPoint.v = EndianS16_BtoN(myPoint.v);
			myPoint.h = EndianS16_BtoN(myPoint.h);
		}
	}

bail:
	*thePoint = myPoint;

	return(myErr);
}


//////////
//
// QTUtils_GetTrackName
// Get the name of the specified movie track.
//
// This routine is modelled on the one contained in Dispatch 2 from the Ice Floe;
// I've modified it to return a C string instead of a Pascal string.
//
// The caller is responsible for disposing of the pointer returned by this function (by calling free).
//
//////////

char *QTUtils_GetTrackName (Track theTrack)
{
	UserData			myUserData = NULL;
	char				*myString = NULL;
 	OSErr				myErr = noErr;

	// make sure we've got a track
	if (theTrack == NULL)
		return(NULL);
		
	// a track's name (if it has one) is stored in the track's user data
	myUserData = GetTrackUserData(theTrack);
	if (myUserData != NULL) {
		Handle			myHandle = NewHandle(0);

		// get the user data item of type kUserDataName;
		// the handle we pass to GetUserData is resized to contain the track name
		myErr = GetUserData(myUserData, myHandle, kUserDataName, 1);
		if (myErr == noErr) {
			long		myLength = GetHandleSize(myHandle);

			if (myLength > 0) {
				myString = malloc(myLength + 1);
				if (myString != NULL) {
					memcpy(myString, *myHandle, myLength);
					myString[myLength] = '\0';
				}
			}			
		}	

		DisposeHandle(myHandle);
	}

	return(myString);
}


//////////
//
// QTUtils_SetTrackName
// Set the name of the specified movie track.
//
// This function adds the specified text to the track's user data;
// the updated user data is written to the movie file when the movie is next updated
// (by calling UpdateMovieResource).
//
//////////

OSErr QTUtils_SetTrackName (Track theTrack, char *theText)
{
	UserData			myUserData = NULL;
	OSErr				myErr = noErr;

	// make sure we've got a track and a name
	if ((theTrack == NULL) || (theText == NULL))
		return(paramErr);
		
	// get the track's user data list
	myUserData = GetTrackUserData(theTrack);
	if (myUserData == NULL)
		return(paramErr);
	
	// remove any existing track name
	while (RemoveUserData(myUserData, kUserDataName, 1) == noErr)
		;

	myErr = SetUserDataItem(myUserData, theText, strlen(theText), kUserDataName, 0);

	return(myErr);
}


//////////
//
// QTUtils_MakeTrackNameByType
// Create a (unique) name for the specified track, based on the track's type.
//
// Given a movie track, this routine constructs a name for that track based on
// the media type of that track. For instance, if the track is a sound track,
// this routine returns the name "Sound". However, if there is more than one
// track of that media type, then this routine numbers the track names. So, if
// there are two sound tracks, this routine names them "Sound 1" and "Sound 2".
//
// This routine is modelled on the one contained in Dispatch 2 from the Ice Floe;
// I've modified it to return a C string instead of a Pascal string.
//
// The caller is responsible for disposing of the pointer returned by this function (by calling free).
//
//////////

char *QTUtils_MakeTrackNameByType (Track theTrack)
{
	Media				myMedia;
	char				*myString = NULL;
 	ComponentResult		myErr = noErr;

	// make sure we've got a track
	if (theTrack == NULL)
		return(NULL);
	
	myMedia = GetTrackMedia(theTrack);
	if (myMedia != NULL) {
		MediaHandler	myMediaHandler = GetMediaHandler(myMedia);
		OSType			myMediaType;
		Str255			myName;

		// get the media type of the track
		GetMediaHandlerDescription(myMedia, &myMediaType, NULL, NULL);
		
		// get the text of the media type
		myErr = MediaGetName(myMediaHandler, myName, 0, NULL);
		if (myErr == noErr) {
			
			// determine whether there's more than one track with this media type
			if (GetMovieIndTrackType(GetTrackMovie(theTrack), 2, myMediaType, movieTrackMediaType) != NULL) {

				// add an index number to the track type string we constructed above
				long	myIndex = 1;
				Str255	myNumString;

				while (GetMovieIndTrackType(GetTrackMovie(theTrack), myIndex, myMediaType, movieTrackMediaType) != theTrack)
		           myIndex++;

				NumToString(myIndex, myNumString);
				myName[++myName[0]] = ' ';
				BlockMoveData(&myNumString[1], &myName[myName[0] + 1], myNumString[0]);
				myName[0] += myNumString[0];
			}

			// now copy the string data from the Pascal string to a C string
			if (myName[0] > 0) {
				myString = malloc(myName[0] + 1);
				if (myString != NULL) {
					memcpy(myString, &myName[1], myName[0]);
					myString[myName[0]] = '\0';
				}
			}			
		}
	}

	return(myString);
}


//////////
//
// QTUtils_IsImageFile
// Is the specified file an image file?
//
//////////

Boolean QTUtils_IsImageFile (FSSpec *theFSSpec)
{	
	GraphicsImportComponent		myImporter = NULL;

	GetGraphicsImporterForFile(theFSSpec, &myImporter);
	if (myImporter != NULL)
		CloseComponent(myImporter);

	return(myImporter != NULL);
}


//////////
//
// QTUtils_IsMovieFile
// Is the specified file a file that can be opened by QuickTime as a movie?
//
//////////

Boolean QTUtils_IsMovieFile (FSSpec *theFSSpec)
{	
	Boolean						isMovieFile = false;
	AliasHandle					myAlias = NULL;
	Component					myImporter = NULL;
	FInfo						myFinderInfo;
	OSErr						myErr = noErr;
			
	// see whether the file type is MovieFileType; to do this, get the Finder information
	myErr = FSpGetFInfo(theFSSpec, &myFinderInfo);	
	if (myErr == noErr)
		if (myFinderInfo.fdType == kQTFileTypeMovie)
			return(true);

	// if it isn't a movie file, see whether the file can be imported as a movie
	myErr = QTNewAlias(theFSSpec, &myAlias, true);
	if (myErr == noErr) {
		if (myAlias != NULL) {
			myErr = GetMovieImporterForDataRef(rAliasType, (Handle)myAlias, kGetMovieImporterDontConsiderGraphicsImporters, &myImporter);
			DisposeHandle((Handle)myAlias);
		}
	}
		
	if ((myErr == noErr) && (myImporter != NULL))		// this file is a movie file
		isMovieFile = true;

	return(isMovieFile);
}


//////////
//
// QTUtils_ConvertFloatToBigEndian
// Convert the specified floating-point number to big-endian format.
//
//////////

void QTUtils_ConvertFloatToBigEndian (float *theFloat)
{
	unsigned long		*myLongPtr;
	
	myLongPtr = (unsigned long *)theFloat;
	*myLongPtr = EndianU32_NtoB(*myLongPtr);
}


//////////
//
// QTUtils_ConvertCToPascalString
// Convert a C string into a Pascal string.
//
// The caller is responsible for disposing of the pointer returned by this function (by calling free).
//
//////////

StringPtr QTUtils_ConvertCToPascalString (char *theString)
{
	StringPtr	myString = malloc(strlen(theString) + 1);
	short		myIndex = 0;

	while (theString[myIndex] != '\0') {
		myString[myIndex + 1] = theString[myIndex];
		myIndex++;
	}
	
	myString[0] = (unsigned char)myIndex;
	
	return(myString);
}


//////////
//
// QTUtils_ConvertPascalToCString
// Convert a Pascal string into a C string.
//
// The caller is responsible for disposing of the pointer returned by this function (by calling free).
//
//////////

char *QTUtils_ConvertPascalToCString (StringPtr theString)
{
	char 		*myString = malloc(theString[0] + 1);
	short		myIndex = 0;

	for (myIndex = 0; myIndex < theString[0]; myIndex++)
		myString[myIndex] = theString[myIndex + 1];
	
	myString[theString[0]] = '\0';
	
	return(myString);
}


//////////
//
// QTUtils_DeleteAllReferencesToTrack
// Delete all existing track references to the specified track.
//
//////////

OSErr QTUtils_DeleteAllReferencesToTrack (Track theTrack)
{
	Movie				myMovie = NULL;
	Track				myTrack = NULL;
	long				myTrackCount = 0L;
	long				myTrRefCount = 0L;
	long				myTrackIndex;
	long				myTrRefIndex;
	OSErr				myErr = noErr;

	myMovie = GetTrackMovie(theTrack);
	if (myMovie == NULL)
		return(paramErr);

	// iterate thru all the tracks in the movie (that are different from the specified track)
	myTrackCount = GetMovieTrackCount(myMovie);
	for (myTrackIndex = 1; myTrackIndex <= myTrackCount; myTrackIndex++) {
		myTrack = GetMovieIndTrack(myMovie, myTrackIndex);
		if ((myTrack != NULL) && (myTrack != theTrack)) {
			OSType		myType = 0L;
	
			// iterate thru all track reference types contained in the current track
			myType = GetNextTrackReferenceType(myTrack, myType);
			while (myType != 0L) {

				// iterate thru all track references of the current type;
				// note that we count down to 1, since DeleteTrackReference will cause
				// any higher-indexed track references to be renumbered
				myTrRefCount = GetTrackReferenceCount(myTrack, myType);
				for (myTrRefIndex = myTrRefCount; myTrRefIndex >= 1; myTrRefIndex--) {
					Track	myRefTrack = NULL;

					myRefTrack = GetTrackReference(myTrack, myType, myTrRefIndex);
					if (myRefTrack == theTrack)
						myErr = DeleteTrackReference(myTrack, myType, myTrRefIndex);
				}

				myType = GetNextTrackReferenceType(myTrack, myType);
			}
		}
	}

	return(myErr);
}


//////////
//
// QTUtils_GetFrameDuration
// Get the duration of the first sample frame in the specified movie track.
//
//////////

TimeValue QTUtils_GetFrameDuration (Track theTrack)
{	
	TimeValue	mySampleDuration;
	OSErr		myErr = noErr;

	myErr = GetMediaSample(	GetTrackMedia(theTrack),
							NULL, 		// don't return sample data
							0,
							NULL,		// don't return number of bytes of sample data returned
							0,
							NULL,
							&mySampleDuration,
							NULL,		// don't return sample description
							NULL,		// don't return sample description index
							0,			// no max number of samples
							NULL,		// don't return number of samples returned
							NULL);		// don't return sample flags

	// make sure we return a legitimate value even if GetMediaSample encounters an error
	if (myErr != noErr)
		mySampleDuration = 0;

	return(mySampleDuration);
}


//////////
//
// QTUtils_GetFrameCount
// Get the number of frames in the specified movie track. We return the value -1 if
// an error occurs and we cannot determine the number of frames in the track.
//
// Based (loosely) on frame-counting code in ConvertToMovie Jr.c.
// 
// We count the frames in the track by stepping through all of its interesting times
// (the places where the track displays a new sample).
//
//////////

long QTUtils_GetFrameCount (Track theTrack)
{	
	long		myCount = -1;
	short		myFlags;
	TimeValue	myTime = 0;
	
	if (theTrack == NULL)
		goto bail;
		
	// we want to begin with the first frame (sample) in the track
	myFlags = nextTimeMediaSample + nextTimeEdgeOK;

	while (myTime >= 0) {
		myCount++;
		
		// look for the next frame in the track; when there are no more frames,
		// myTime is set to -1, so we'll exit the while loop
		GetTrackNextInterestingTime(theTrack, myFlags, myTime, fixed1, &myTime, NULL);
		
		// after the first interesting time, don't include the time we're currently at
		myFlags = nextTimeStep;
	}

bail:
	return(myCount);
}


//////////
//
// QTUtils_GetMaxWindowDepth
// Get the deepest pixel type and size of the screen area intersected by a specified window.
//
//////////

#if TARGET_OS_MAC
void QTUtils_GetMaxWindowDepth (CWindowPtr theWindow, short *thePixelType, short *thePixelSize)
{
	Rect			myRect;
	Point			myPoint = {0, 0};
	
	// initialize returned values 
	*thePixelType = k1MonochromePixelFormat;
	*thePixelSize = 0;

	if (theWindow == NULL)
		return;

	GetWindowPortBounds(theWindow, &myRect);

	// assume the window is the current port
	LocalToGlobal(&myPoint);

	// offset the rectangle to global coordinates
	MacOffsetRect(&myRect, myPoint.h, myPoint.v);
	
	// get the max data for the global rectangle
	QTUtils_GetMaxScreenDepth(&myRect, thePixelType, thePixelSize);
}
#endif

//////////
//
// QTUtils_GetMaxScreenDepth
// Get the deepest pixel type and size of the screen area intersected by a specified rectangle.
//
//////////

void QTUtils_GetMaxScreenDepth (Rect *theGlobalRect, short *thePixelType, short *thePixelSize)
{
	GDHandle		myGDevice = NULL;
	PixMapHandle	myPixMap = NULL;

	myGDevice = GetMaxDevice(theGlobalRect);	// get the max device
	if (myGDevice != NULL) {
		// get the pixmap for the max device
		myPixMap = (**myGDevice).gdPMap;
		if (myPixMap != NULL) {
			// extract the interesting info from the pixmap of the device
			*thePixelType = (**myPixMap).pixelType;
			*thePixelSize = (**myPixMap).pixelSize;
		}
	}
}


//////////
//
// QTUtils_GetUsersConnectionSpeed
// Return the connection speed selected by the user in the QuickTime Settings control panel;
// return kDataRate288ModemRate if the user's QuickTime preferences cannot be read of if some
// other error occurs.
//
// Based on code in Ice Floe Dispatch 17 by Mike Dodd.
//
//////////

long QTUtils_GetUsersConnectionSpeed (void)
{
	QTAtomContainer					myPrefsContainer = NULL;
	QTAtom							myPrefsAtom = 0;
	ConnectionSpeedPrefsRecord		myPrefsRec;
	long							myDataSize = 0L;
	long							mySpeed = kDataRate288ModemRate;
	Ptr								myAtomData = NULL;
	OSErr							myErr = noErr;

	// you can retrieve the user's QuickTime preferences by calling GetQuickTimePreference;
	// the first parameter indicates the type of preference you want information about, and
	// the second parameter is an atom container that contains the returned preference data 
	myErr = GetQuickTimePreference(ConnectionSpeedPrefsType, &myPrefsContainer);
    if (myErr == noErr) {
    		
		// find the atom of the desired type
		myPrefsAtom = QTFindChildByID(myPrefsContainer, kParentAtomIsContainer, ConnectionSpeedPrefsType, 1, NULL);
        if (myPrefsAtom != 0) {
			// we found the desired atom in the returned atom container;
			// read the data contained in that atom and verify that the data is of the
			// size we are expecting
			QTGetAtomDataPtr(myPrefsContainer, myPrefsAtom, &myDataSize, &myAtomData);
			
			if (myDataSize == sizeof(ConnectionSpeedPrefsRecord)) {
				// read the connection speed
				
				// NOTE: the data in this atom is native-endian, so we do not need to
				// perform any endian-swapping when extracting the speed from the atom.
				// (This is an exception to the rule that data in atom containers is
				// always big-endian.)
				myPrefsRec = *(ConnectionSpeedPrefsRecord *)myAtomData;
				mySpeed = myPrefsRec.connectionSpeed;
			}
		}

		QTDisposeAtomContainer(myPrefsContainer);
	}
	
	return(mySpeed);
}


//////////
//
// QTUtils_SetUsersConnectionSpeed
// Set the connection speed in the QuickTime Settings control panel to the specified value.
//
// NOTE: In general, you should let the user decide the connection speed (using the QuickTime
// Settings control panel). In some cases, however, you might need to do this programmatically.
// Also, you should in general use values for theSpeed that are enumerated in the header file
// MoviesFormat.h.
//
// Based on code in Ice Floe Dispatch 17 by Mike Dodd.
//
//////////

OSErr QTUtils_SetUsersConnectionSpeed (long theSpeed)
{
	QTAtomContainer					myPrefsContainer = NULL;
	ConnectionSpeedPrefsRecord		myPrefsRec;
	OSErr							myErr = noErr;

	myErr = QTNewAtomContainer(&myPrefsContainer);
	if (myErr == noErr) {
		// NOTE: the data in this atom is native-endian, so we do not need to
		// perform any endian-swapping when inserting the speed into the atom.
		// (This is an exception to the rule that data in atom containers is
		// always big-endian.)
		myPrefsRec.connectionSpeed = theSpeed;
		
		myErr = QTInsertChild(myPrefsContainer, kParentAtomIsContainer, ConnectionSpeedPrefsType, 1, 0, sizeof(ConnectionSpeedPrefsRecord), &myPrefsRec, NULL);
		if (myErr == noErr)
			myErr = SetQuickTimePreference(ConnectionSpeedPrefsType, myPrefsContainer);
			
		QTDisposeAtomContainer(myPrefsContainer);
	}

	return(myErr);
}


#if CONTENT_RATING_AVAIL
//////////
//
// QTUtils_GetUsersContentRating
// Return, through the function's parameters, the content rating and acceptable content types
// selected by the user in the QuickTime Settings control panel; return an error if the user's
// QuickTime preferences cannot be read.
//
// Based on QTUtils_GetUsersConnectionSpeed.
//
//////////

OSErr QTUtils_GetUsersContentRating (UInt32 *theType, UInt16 *theRating)
{
	QTAtomContainer					myPrefsContainer = NULL;
	QTAtom							myPrefsAtom = 0;
	ContentRatingPrefsRecord		myContentRec;
	long							myDataSize = 0L;
	Ptr								myAtomData = NULL;
	OSErr							myErr = noErr;

	// you can retrieve the user's QuickTime preferences by calling GetQuickTimePreference;
	// the first parameter indicates the type of preference you want information about, and
	// the second parameter is an atom container that contains the returned preference data 
	myErr = GetQuickTimePreference(kContentRatingPrefsType, &myPrefsContainer);
    if (myErr == noErr) {
    		
		// find the atom of the desired type
		myPrefsAtom = QTFindChildByID(myPrefsContainer, kParentAtomIsContainer, kContentRatingPrefsType, 1, NULL);
        if (myPrefsAtom == 0) {
        	// we did not find any such atom in the returned atom container, so we'll
			// return default settings
			*theType = 0L;
			*theRating = kQTContentTVYRating;
		} else {
			// we found the desired atom in the returned atom container;
			// read the data contained in that atom and verify that the data is of the
			// size we are expecting
			myErr = QTGetAtomDataPtr(myPrefsContainer, myPrefsAtom, &myDataSize, &myAtomData);
			
			if (myDataSize != sizeof(ContentRatingPrefsRecord)) {
				// the data in the atom isn't the right size, so it must be corrupt;
				// return default settings
				*theType = 0L;
				*theRating = kQTContentTVYRating;
			} else {
				// everything is fine: read the content information
				
				// NOTE: the data in this atom is native-endian, so we do not need to
				// perform any endian-swapping when extracting the data from the atom.
				// (This is an exception to the rule that data in atom containers is
				// always big-endian.)
				
				// WARNING: the format of the data in a content rating atom is, to my
				// knowledge, currently undocumented; the following method of extracting
				// that info is based on empirical investigation.
				myContentRec = *(ContentRatingPrefsRecord *)myAtomData;
				*theType = (UInt32)(~(myContentRec.fContentTypes) & 0x00ff);
				*theRating = myContentRec.fContentRating;
			}
		}

		QTDisposeAtomContainer(myPrefsContainer);
	}
	
	return(myErr);
}
#endif	// #if CONTENT_RATING_AVAIL


///////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Controller utilities.
//
// Use these functions to manipulate movie controllers.
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////

//////////
//
// QTUtils_GetControllerType
// Get the controller type of the specified movie.
//
//////////

OSType QTUtils_GetControllerType (Movie theMovie) 
{
	UserData		myUserData = NULL;
	OSType			myType = kUnknownType;
	OSErr			myErr = noErr;
	
	// make sure we've got a movie
	if (theMovie == NULL)
		return(myType);
		
	myUserData = GetMovieUserData(theMovie);
	if (myUserData != NULL) {
		myErr = GetUserDataItem(myUserData, &myType, sizeof(myType), kUserDataMovieControllerType, 0);
		if (myErr == noErr)
			myType = EndianU32_BtoN(myType);
	}
	
	return(myType);
}


//////////
//
// QTUtils_SetControllerType
// Set the controller type of the specified movie.
//
// This function adds an item to the movie's user data;
// the updated user data is written to the movie file when the movie is next updated
// (by calling AddMovieResource or UpdateMovieResource).
//
// NOTE: This function is intended to set the controller type of a movie you're building;
// to change the controller of an open movie, use QTUtils_ChangeControllerType.
//
//////////

OSErr QTUtils_SetControllerType (Movie theMovie, OSType theType)
{
	UserData		myUserData;
	OSErr			myErr = noErr;

	// make sure we've got a movie
	if (theMovie == NULL)
		return(paramErr);
		
	// get the movie's user data list
	myUserData = GetMovieUserData(theMovie);
	if (myUserData == NULL)
		return(paramErr);
	
	theType = EndianU32_NtoB(theType);
	myErr = SetUserDataItem(myUserData, &theType, sizeof(theType), kUserDataMovieControllerType, 0);

	return(myErr);
}


//////////
//
// QTUtils_ChangeControllerType
// Change the controller type of the movie that uses the specified controller, "on the fly",
// and return the new movie controller to the caller; if for some reason we cannot create a
// new movie controller, return NULL.
//
//////////

MovieController QTUtils_ChangeControllerType (MovieController theMC, OSType theType, long theFlags)
{
	MovieController		myMC = NULL;
	Movie				myMovie = NULL;
	Rect				myRect;
	OSErr				myErr = noErr;

	// make sure we've got a movie controller
	if (theMC == NULL)
		return(NULL);
	
	// get the movie associated with that controller
	myMovie = MCGetMovie(theMC);
	if (myMovie == NULL)
		return(NULL);
		
	GetMovieBox(myMovie, &myRect);

	// set the new controller type in the movie's user data list
	myErr = QTUtils_SetControllerType(myMovie, theType);
	if (myErr != noErr)
		return(NULL);

	// dispose of the existing controller
	DisposeMovieController(theMC);
	
	// create a new controller of the specified type
	myMC = NewMovieController(myMovie, &myRect, theFlags);

	return(myMC);
}


#endif	// ifndef __QTUtilities__