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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<h2>/Common Files/QTUtilities.c</h2>
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<pre class="sourcecodebox">//////////
//
// 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):
//
// <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);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// 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).
//
//////////