/*

Project: CIColorTracking

File: VideoHandler.m

Abstract: 

This is the implementation file for VideoHandler, a class that handles showing the tracking movie. 

Version 1.0

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*/

#import "VideoHandler.h"

@interface VideoHandler (private)

- (CVReturn)renderTime:(const CVTimeStamp *)timeStamp;

@end

//--------------------------------------------------------------------------------------------------

//--------------------------------------------------------------------------------------------------

static CVReturn renderCallback(CVDisplayLinkRef displayLink, 

                                                const CVTimeStamp *inNow, 

                                                const CVTimeStamp *inOutputTime, 

                                                CVOptionFlags flagsIn, 

                                                CVOptionFlags *flagsOut, 

                                                void *displayLinkContext)

{

    return [(VideoHandler*)displayLinkContext renderTime:inOutputTime];

}

//--------------------------------------------------------------------------------------------------

//--------------------------------------------------------------------------------------------------

@implementation VideoHandler

//--------------------------------------------------------------------------------------------------

- (id)initWithView:(NSOpenGLView*)baseView delegate:(id)videoDelegate

{

    CVReturn                ret;

    OSStatus                error;

    self = [super init];

    /* Create display link */

    CGOpenGLDisplayMask     totalDisplayMask = 0;

    int                     virtualScreen;

    long                    displayMask;

    NSOpenGLPixelFormat *openGLPixelFormat = [baseView pixelFormat];

    // Start the view on the main display.

    viewDisplayID = (CGDirectDisplayID)[[[[[baseView window] screen] deviceDescription] objectForKey:@"NSScreenNumber"] intValue]; 

    // Build a list of displays from the OpenGL pixel format.

    for (virtualScreen = 0; virtualScreen < [openGLPixelFormat  numberOfVirtualScreens]; virtualScreen++)

    {

        [openGLPixelFormat getValues:&displayMask forAttribute:NSOpenGLPFAScreenMask forVirtualScreen:virtualScreen];

        totalDisplayMask |= displayMask;

    }

    ret = CVDisplayLinkCreateWithOpenGLDisplayMask(totalDisplayMask, &displayLink);

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(windowChangedScreen:) name:NSWindowDidMoveNotification object:nil];

    // Set up callbacks for the display link.

    CVDisplayLinkSetOutputCallback(displayLink, renderCallback, self);

    // Create a visual context.

    NSDictionary        *attributes = nil;

    attributes = [NSDictionary dictionaryWithObjectsAndKeys:[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:720.0], kQTVisualContextTargetDimensions_WidthKey, 

                                                    [NSNumber numberWithFloat:480.0], kQTVisualContextTargetDimensions_HeightKey, nil], 

                                kQTVisualContextTargetDimensionsKey, 

                                [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:720.0], kCVPixelBufferWidthKey, 

                                                    [NSNumber numberWithFloat:480.0], kCVPixelBufferHeightKey, nil], 

                                kQTVisualContextPixelBufferAttributesKey,

                                nil];

    error = QTOpenGLTextureContextCreate(NULL, 

                                        (CGLContextObj)[[baseView openGLContext] CGLContextObj],

                                        (CGLPixelFormatObj)[[baseView pixelFormat] CGLPixelFormatObj],

                                        (CFDictionaryRef)attributes, &qtVisualContext);

    view = baseView;

    delegate = videoDelegate;

    return self;

}

//--------------------------------------------------------------------------------------------------

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    CVDisplayLinkRelease(displayLink);

    QTVisualContextRelease(qtVisualContext);

    [movie release];

    [super dealloc];

}

//--------------------------------------------------------------------------------------------------

- (void)windowChangedScreen:(NSNotification*)inNotification

{

    // If the video moves to a different screen, synchronize to the timing of that screen.

    NSWindow *window = [inNotification object]; 

    CGDirectDisplayID displayID = (CGDirectDisplayID)[[[[window screen] deviceDescription] objectForKey:@"NSScreenNumber"] intValue];

    if((displayID != NULL) && (viewDisplayID != displayID))

    {

        CVDisplayLinkSetCurrentCGDisplay(displayLink, displayID);

        viewDisplayID = displayID;

    }

}

//--------------------------------------------------------------------------------------------------

- (BOOL)loadMovieFromPath:(NSString*)moviePath

{

    NSError     *error;

    [movie release];

    movie = [[QTMovie movieWithFile:moviePath error:&error] retain];

    if(movie)

    {

        OSStatus status;

        status = SetMovieVisualContext([movie quickTimeMovie],qtVisualContext);

        SetMoviePlayHints([movie quickTimeMovie],hintsHighQuality, hintsHighQuality);   

        // set Movie to loop

        [movie setAttribute:[NSNumber numberWithBool:YES] forKey:QTMovieLoopsAttribute];                    

        [movie gotoBeginning];

        MoviesTask([movie quickTimeMovie], 0);  //QTKit is not doing this automatically

        movieDuration = [[[movie movieAttributes] objectForKey:QTMovieDurationAttribute] QTTimeValue];

        [self renderTime:nil];

    }

    return error != nil;

}

//--------------------------------------------------------------------------------------------------

- (IBAction)togglePlayback

{

    if(CVDisplayLinkIsRunning(displayLink))

    {

        CVDisplayLinkStop(displayLink);

        [movie stop];

    } else {

        [movie play];

        CVDisplayLinkStart(displayLink);

    }

}

//--------------------------------------------------------------------------------------------------

- (void)scrubMovie:(double)progress

{

    if(CVDisplayLinkIsRunning(displayLink))

        [self togglePlayback];

    // Get the movie time.

    QTTime currentTime;

    currentTime.timeValue = (long long)((double)movieDuration.timeValue * progress);

    currentTime.timeScale = movieDuration.timeScale;

    currentTime.flags = 0;

    [movie setCurrentTime:currentTime];

    [self renderTime:nil];

}

//--------------------------------------------------------------------------------------------------

- (BOOL)isPlaying

{

    return CVDisplayLinkIsRunning(displayLink);

}

//--------------------------------------------------------------------------------------------------

- (BOOL)getFrameForTime:(const CVTimeStamp *)timeStamp

{

    OSStatus error = noErr;

    // Check to see whether a new frame is available.

    QTVisualContextTask(qtVisualContext);

    if(QTVisualContextIsNewImageAvailable(qtVisualContext,timeStamp))

    {       

        CVOpenGLTextureRelease(currentFrame);

        QTVisualContextCopyImageForTime(qtVisualContext,

            NULL,

            timeStamp,

            &currentFrame);

        // In general this shouldn't happen, but just in case, handle the error.

        if(error != noErr && !currentFrame)

        {

            NSLog(@"QTVisualContextCopyImageForTime: %ld\n",error);

            return NO;

        }

        return YES;

    } 

    return NO;

}

//--------------------------------------------------------------------------------------------------

- (CVReturn)renderTime:(const CVTimeStamp *)timeStamp

{

    // This method is called by the Core Video diplay link render thread. 

    CVReturn rv = kCVReturnError;

    NSAutoreleasePool *pool;

    // Use a local autorelease pool because this gets called from a separate thread.

    pool = [[NSAutoreleasePool alloc] init]; 

    if([self getFrameForTime:timeStamp])

    {

        QTTime  currentTime = [movie currentTime];

        [delegate renderFrame:currentFrame progress:(double)currentTime.timeValue / (double)movieDuration.timeValue];

        rv = kCVReturnSuccess;

    } else {

        rv = kCVReturnError;

    }

    [pool release];

    return rv;

}

//--------------------------------------------------------------------------------------------------

//--------------------------------------------------------------------------------------------------

@end