C++ MoviesTask函数代码示例

OSErr QTDR_PlayMovieFromRAM (Movie theMovie)
{
	WindowPtr				myWindow = NULL;
	Rect					myBounds = {50, 50, 100, 100};
	Rect					myRect;
	StringPtr				myTitle = QTUtils_ConvertCToPascalString(kWindowTitle);
	OSErr					myErr = memFullErr;

	myWindow = NewCWindow(NULL, &myBounds, myTitle, false, 0, (WindowPtr)-1, false, 0);
	if (myWindow == NULL)
		goto bail;
		
	myErr = noErr;
	
	MacSetPort((GrafPtr)GetWindowPort(myWindow));

	GetMovieBox(theMovie, &myRect);
	MacOffsetRect(&myRect, -myRect.left, -myRect.top);
	SetMovieBox(theMovie, &myRect);

	if (!EmptyRect(&myRect))
		SizeWindow(myWindow, myRect.right, myRect.bottom, false);
	else
		SizeWindow(myWindow, 200, 0, false);
		
	MacShowWindow(myWindow);

	SetMovieGWorld(theMovie, GetWindowPort(myWindow), NULL);
	GoToBeginningOfMovie(theMovie);
	MoviesTask(theMovie, 0);
	StartMovie(theMovie);
	
	myErr = GetMoviesError();
	if (myErr != noErr)
		goto bail;
	
	while (!IsMovieDone(theMovie))
		MoviesTask(theMovie, 0);

bail:
	free(myTitle);
	
	if (theMovie != NULL)
		DisposeMovie(theMovie);

	if (myWindow != NULL)
		DisposeWindow(myWindow);
		
	return(myErr);
}

//--------------------------------------------------------
void ofVideoPlayer::play(){

	//--------------------------------------
	#ifdef OF_VIDEO_PLAYER_QUICKTIME
	//--------------------------------------

	if (!bStarted){
	 	start();
	}else {
		// ------------ lower level "startMovie"
		// ------------ use desired speed & time (-1,1,etc) to Preroll...
		bPlaying = true;
		TimeValue timeNow;
	   	timeNow = GetMovieTime(moviePtr, nil);
		PrerollMovie(moviePtr, timeNow, X2Fix(speed));
		SetMovieRate(moviePtr,  X2Fix(speed));
		MoviesTask(moviePtr, 0);
	}

	//--------------------------------------
	#endif
	//--------------------------------------


}

/** Internal helper function: Returns fps rate of movie and optionally
 *  the total number of video frames in the movie. Framecount is determined
 *  by stepping through the whole movie and counting frames. This can take
 *  significant time on big movie files.
 *
 *  Always returns fps as a double. Only counts and returns full framecount,
 *  if *nrframes is non-NULL.
 */
double PsychDetermineMovieFramecountAndFps(Movie theMovie, int* nrframes)
{
    // Count total number of videoframes: This code is derived from Apple
    // example code.
    long		myCount = -1;
    short		myFlags;
    TimeValue           myTime = 0;
    TimeValue           myDuration = 0;
    OSType		myTypes[1];
    // We want video samples.
    myTypes[0] = VisualMediaCharacteristic;
    // We want to begin with the first frame in the movie:
    myFlags = nextTimeStep + nextTimeEdgeOK;
    
    // We count either the first 3 frames if nrframes==NULL aka only
    // fps requested, or if framecount is requested, we count all frames.
    while (myTime >= 0 && (myCount<2 || nrframes!=NULL)) {
        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
        GetMovieNextInterestingTime(theMovie, myFlags, 1, myTypes, myTime, FloatToFixed(1), &myTime, &myDuration);        
        // after the first interesting time, don't include the time we're currently at
        myFlags = nextTimeStep;
    }    
    
    // Return optional count of frames:
    if (nrframes) *nrframes = (int) myCount;
    
    GoToBeginningOfMovie(theMovie);
    MoviesTask(theMovie, 0);
    
    // Compute and return frame rate in fps as (Ticks per second / Duration of single frame in ticks): 
    return((double) GetMovieTimeScale(theMovie) / (double) myDuration);    
}

/*
 *  PsychSetMovieTimeIndex()  -- Set current playback time of movie.
 */
double PsychSetMovieTimeIndex(int moviehandle, double timeindex)
{
    Movie   theMovie;
    double  oldtime;
    
    if (moviehandle < 0 || moviehandle >= PSYCH_MAX_MOVIES) {
        PsychErrorExitMsg(PsychError_user, "Invalid moviehandle provided!");
    }
    
    // Fetch references to objects we need:
    theMovie = movieRecordBANK[moviehandle].theMovie;    
    if (theMovie == NULL) {
        PsychErrorExitMsg(PsychError_user, "Invalid moviehandle provided. No movie associated with this handle !!!");
    }
    
    // Retrieve current timeindex:
    oldtime = (double) GetMovieTime(theMovie, NULL) / (double) GetMovieTimeScale(theMovie);
    
    // Set new timeindex:
    SetMovieTimeValue(theMovie, (TimeValue) (((timeindex * (double) GetMovieTimeScale(theMovie))) + 0.5f));

    // Check if end of movie is reached. Rewind, if so...
    if (IsMovieDone(theMovie) && movieRecordBANK[moviehandle].loopflag > 0) {
        if (GetMovieRate(theMovie)>0) {
            GoToBeginningOfMovie(theMovie);
        } else {
            GoToEndOfMovie(theMovie);
        }
    }
        
    MoviesTask(theMovie, 0);
    
    // Return old value:
    return(oldtime);
}

static DWORD WINAPI QTSplitter_loading_thread(LPVOID data)
{
    QTSplitter *This = (QTSplitter *)data;

    if (This->pAudio_Pin)
    {
        /* according to QA1469 a movie has to be fully loaded before we
           can reliably start the Extraction session.

           If loaded earlier, then we only get an extraction session for
           the part of the movie that is loaded at that time.

            We are trying to load as much of the movie as we can before we
            start extracting.  However we can recreate the extraction session
            again when we run out of loaded extraction frames. But we want
            to try to minimize that.
         */

        EnterCriticalSection(&This->csReceive);
        while(This->pQTMovie && GetMovieLoadState(This->pQTMovie) < kMovieLoadStateComplete)
        {
            MoviesTask(This->pQTMovie, 100);
            LeaveCriticalSection(&This->csReceive);
            Sleep(0);
            EnterCriticalSection(&This->csReceive);
        }
        LeaveCriticalSection(&This->csReceive);
    }
    return 0;
}

//---------------------------------------------------------------------------
void ofVideoPlayer::setPosition(float pct){


 	//--------------------------------------
	#ifdef OF_VIDEO_PLAYER_QUICKTIME
	//--------------------------------------

	 	TimeRecord tr;
	 	tr.base 		= GetMovieTimeBase(moviePtr);
		long total 		= GetMovieDuration(moviePtr );
		long newPos 	= (long)((float)total * pct);
		SetMovieTimeValue(moviePtr, newPos);
		MoviesTask(moviePtr,0);

	//--------------------------------------
	#else
	//--------------------------------------

		gstUtils.setPosition(pct);

	//--------------------------------------
	#endif
	//--------------------------------------


}

void QTCode_ForceMovieRedraw(Movie theMovie) 
{
	OSErr 		err = noErr;
	Rect		movieRect;
	RgnHandle	clipRegion = NULL;

	
		if (theMovie == NULL) goto bail;
	
		clipRegion = NewRgn();
		if (clipRegion == NULL) goto bail;
		
		GetClip(clipRegion);
		GetMovieBox(theMovie, &movieRect); 
		ClipRect(&movieRect);
	
		UpdateMovie(theMovie);
		MoviesTask(theMovie, 0);
	
		SetClip(clipRegion);
	
			/* Closure. Clean up if we have handles. */
	bail:	
	
		if	(clipRegion != NULL)
		{
			DisposeRgn(clipRegion);
		}
}

//---------------------------------------------------------------------------
void ofQuickTimePlayer::update(){

	if (bLoaded == true){

		//--------------------------------------------------------------
		#ifdef OF_VIDEO_PLAYER_QUICKTIME
		//--------------------------------------------------------------

			#if defined(TARGET_WIN32) || defined(QT_USE_MOVIETASK)
				MoviesTask(moviePtr,0);
			#endif

		//--------------------------------------------------------------
		#endif
		//--------------------------------------------------------------
	}

	// ---------------------------------------------------
	// 		on all platforms,
	// 		do "new"ness ever time we idle...
	// 		before "isFrameNew" was clearning,
	// 		people had issues with that...
	// 		and it was badly named so now, newness happens
	// 		per-idle not per isNew call
	// ---------------------------------------------------
	
	if (bLoaded == true){

		bIsFrameNew = bHavePixelsChanged;
		if (bHavePixelsChanged == true) {
			bHavePixelsChanged = false;
		}
	}

}

//--------------------------------------------------------
void ofQuickTimePlayer::start(){

	//--------------------------------------
	#ifdef OF_VIDEO_PLAYER_QUICKTIME
	//--------------------------------------

	if (bLoaded == true && bStarted == false){
		SetMovieActive(moviePtr, true);

		//------------------ set the movie rate to default
		//------------------ and preroll, so the first frames come correct

		TimeValue timeNow 	= 	GetMovieTime(moviePtr, 0);
		Fixed playRate 		=	GetMoviePreferredRate(moviePtr); 		//Not being used!

		PrerollMovie(moviePtr, timeNow, X2Fix(speed));
		SetMovieRate(moviePtr,  X2Fix(speed));
		setLoopState(currentLoopState);

		// get some pixels in there right away:
		MoviesTask(moviePtr,0);
		#if defined(TARGET_OSX) && defined(__BIG_ENDIAN__)
			convertPixels(offscreenGWorldPixels, pixels.getPixels(), width, height);
		#endif
		bHavePixelsChanged = true;

		bStarted = true;
		bPlaying = true;
	}

	//--------------------------------------
	#endif
	//--------------------------------------
}

boolean isplayerevent (void) {
	
	/*
	7.0b4 PBS: called from the main event loop.
	QuickTime needs to catch some events.
	Return true if the event is consumed by QuickTime
	and should be ignored by the event loop.
	*/
	
	boolean fl = false;
	
	if (currentmovie == nil) /*if no current movie, return right away*/
	
		return (fl);
	
	if (currentcontroller == nil) /*if no controller, return right away*/
		
		return (fl);
	
	if (MCIsPlayerEvent (currentcontroller, &shellevent))
		
		fl = true; /*the event was consumed by QuickTime*/
	
	MCIdle (currentcontroller);
	
	MoviesTask (nil, 0);
		
	return (fl);
	} /*isplayerevent*/

//--------------------------------------------------------
void ofQuickTimePlayer::play(){
	if( !isLoaded() ){
		ofLog(OF_LOG_ERROR, "ofQuickTimePlayer::play - movie not loaded!");
		return;
	}

	bPlaying = true;
	bPaused = false;
	
	//--------------------------------------
	#ifdef OF_VIDEO_PLAYER_QUICKTIME
	//--------------------------------------

	if (!bStarted){
	 	start();
	}else {
		// ------------ lower level "startMovie"
		// ------------ use desired speed & time (-1,1,etc) to Preroll...
		TimeValue timeNow;
	   	timeNow = GetMovieTime(moviePtr, nil);
		PrerollMovie(moviePtr, timeNow, X2Fix(speed));
		SetMovieRate(moviePtr,  X2Fix(speed));
		MoviesTask(moviePtr, 0);
	}
	
	//--------------------------------------
	#endif
	//--------------------------------------

	//this is if we set the speed first but it only can be set when we are playing.
	setSpeed(speed);

}

//--------------------------------------------------------
void ofVideoPlayer::start(){

	//--------------------------------------
	#ifdef OF_VIDEO_PLAYER_QUICKTIME
	//--------------------------------------

	if (bLoaded == true && bStarted == false){
		SetMovieActive(moviePtr, true);

		//------------------ set the movie rate to default
		//------------------ and preroll, so the first frames come correct

		TimeValue timeNow 	= 	GetMovieTime(moviePtr, 0);
		Fixed playRate 		=	GetMoviePreferredRate(moviePtr); 		//Not being used!

		PrerollMovie(moviePtr, timeNow, X2Fix(speed));
		SetMovieRate(moviePtr,  X2Fix(speed));
		setLoopState(OF_LOOP_NORMAL);

		// get some pixels in there right away:
		MoviesTask(moviePtr,0);
		convertPixels(offscreenGWorldPixels, pixels, width, height);
		bHavePixelsChanged = true;
		if (bUseTexture == true){
			tex.loadData(pixels, width, height, GL_RGB);
		}

		bStarted = true;
		bPlaying = true;
	}

	//--------------------------------------
	#endif
	//--------------------------------------
}

//
// MusicEvents
// Called in the event loop to keep track of MIDI music
//
void MIDI_Update (void)
{
	if (midiTrack)
	{
		// pOx - adjust volume if changed
		if (old_volume != bgmvolume.value)
			MIDI_SetVolume (&bgmvolume);

		// Let QuickTime get some time
		MoviesTask (midiTrack, 0);

		// If this song is looping, restart it
		if (IsMovieDone (midiTrack))
		{
			if (bLooped)
			{
				GoToBeginningOfMovie (midiTrack);
				StartMovie (midiTrack);
			}
			else
			{
				DisposeMovie (midiTrack);
				midiTrack = NULL;
			}
		}
	}
}

//---------------------------------------------------------------------------
void ofQuickTimePlayer::update() {

    if (bLoaded == true) {

        //--------------------------------------------------------------
#ifdef OF_VIDEO_PLAYER_QUICKTIME
        //--------------------------------------------------------------

        // is this necessary on windows with quicktime?
#ifdef TARGET_OSX
        // call MoviesTask if we're not on the main thread
        if ( CFRunLoopGetCurrent() != CFRunLoopGetMain() )
        {
            //ofLog( OF_LOG_NOTICE, "not on the main loop, calling MoviesTask") ;
            MoviesTask(moviePtr,0);
        }
#else
        // on windows we always call MoviesTask
        MoviesTask(moviePtr,0);
#endif

        //--------------------------------------------------------------
#endif
        //--------------------------------------------------------------
    }

    // ---------------------------------------------------
    // 		on all platforms,
    // 		do "new"ness ever time we idle...
    // 		before "isFrameNew" was clearning,
    // 		people had issues with that...
    // 		and it was badly named so now, newness happens
    // 		per-idle not per isNew call
    // ---------------------------------------------------

    if (bLoaded == true) {

        bIsFrameNew = bHavePixelsChanged;
        if (bHavePixelsChanged == true) {
            bHavePixelsChanged = false;
        }
    }

}

/*
 *  PsychQTDeleteMovie() -- Delete a movie object and release all associated ressources.
 */
void PsychQTDeleteMovie(int moviehandle)
{
    if (moviehandle < 0 || moviehandle >= PSYCH_MAX_MOVIES) {
        PsychErrorExitMsg(PsychError_user, "Invalid moviehandle provided!");
    }
    
    if (movieRecordBANK[moviehandle].theMovie == NULL) {
        PsychErrorExitMsg(PsychError_user, "Invalid moviehandle provided. No movie associated with this handle !!!");
    }
        
    // Stop movie playback immediately:
    MoviesTask(movieRecordBANK[moviehandle].theMovie, 0);
    StopMovie(movieRecordBANK[moviehandle].theMovie);
    glFinish();
    QTVisualContextTask(movieRecordBANK[moviehandle].QTMovieContext);
    MoviesTask(movieRecordBANK[moviehandle].theMovie, 0);
    QTVisualContextTask(movieRecordBANK[moviehandle].QTMovieContext);
    glFinish();
        
    // Delete movieobject for this handle:
    DisposeMovie(movieRecordBANK[moviehandle].theMovie);
    movieRecordBANK[moviehandle].theMovie=NULL;    

    // Delete GWorld if any:
    if (movieRecordBANK[moviehandle].QTMovieGWorld) DisposeGWorld(movieRecordBANK[moviehandle].QTMovieGWorld);
    movieRecordBANK[moviehandle].QTMovieGWorld = NULL;

    // Delete visual context for this movie:
    if (movieRecordBANK[moviehandle].QTMovieContext) QTVisualContextRelease(movieRecordBANK[moviehandle].QTMovieContext);
    movieRecordBANK[moviehandle].QTMovieContext = NULL;

    // Delete audio context for this movie:
    QTAudioContextRelease(movieRecordBANK[moviehandle].QTAudioContext);
    movieRecordBANK[moviehandle].QTAudioContext = NULL;
    
    // Decrease counter:
    if (numMovieRecords>0) numMovieRecords--;
        
    return;
}