/*

File: MyController.m

Abstract: Controller class for this sample code project. Contains code to grab an

 NSImage for the current movie frame and display it in an image view. The user

 may also choose a new movie file to display.

Version: <1.0>

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*/

#import "MyController.h"

@implementation MyController

//

// awakeFromNib

//

// Here we'll load our default movie and set it on the view

//

-(void)awakeFromNib

{

    /* locate our default QuickTime movie */

    NSBundle *mainBundle = [NSBundle mainBundle];

    NSString *filepath = [mainBundle pathForResource:@"Sample" ofType:@"mov"];

    /* make a QTMovie from our default QuickTime movie */

    mMovie = [QTMovie movieWithFile:filepath error:NULL];

    if (mMovie)

    {

        [mMovie retain];

        /* set our default movie on the view */

        [mMovieView setMovie: mMovie];

        // display movie image for the current movie time

        [self captureMovieImageAtTime:self];

    }

}

#pragma mark Set New Movie

//

// openPanelDidEnd

//

// Called when the open panel is dismissed

// We'll instantiate a new QTMovie from the selected movie file path, and

// then set it on the view and display the image for the current movie time

//

- (void) openPanelDidEnd:(NSOpenPanel *)sheet returnCode:(int)returnCode contextInfo:(void  *)contextInfo

  {

    if (returnCode == 1)

    {

        NSArray *files = [sheet filenames];

        if ([files count])

        {

            // instantiate a new movie from the selected file path

            QTMovie *newMovie = [QTMovie movieWithFile:[files objectAtIndex:0] error:NULL];

            // were we able to properly instantiate a new QTMovie?

            if (newMovie)

            {

                if (mMovie)

                {

                    [mMovie release];   // release existing movie

                }

                [newMovie retain];

                mMovie = newMovie;  // save new movie

                // set this new movie on the view

                [mMovieView setMovie: mMovie];

                // display movie image for the current movie time

                [self captureMovieImageAtTime:self];

            }

        }

    }

  }

//

// openFile

//

// Prompt the user for a new movie file

//

- (void) openFile: (id)sender

  {

    NSOpenPanel *panel = [NSOpenPanel openPanel];

    [panel  // Get the shared open panel

        beginSheetForDirectory:nil  // same directory used in the previous invocation of the panel

        file:nil

        types:[QTMovie movieUnfilteredFileTypes]    // show QTMovie supported file types

        modalForWindow:mWindow  // This makes it show up as a sheet, attached to window

        modalDelegate:self      

        didEndSelector:@selector(openPanelDidEnd:returnCode:contextInfo:)  // Call this method when you're done..

        contextInfo:NULL];  

  }

//

// setMovie

//

// Called when the "set movie" button is pressed

// to allow the user to select and display a different movie.

//

-(IBAction)setMovie:(id)sender

{

    [self  openFile: self];

}

#pragma mark Get Movie Image Frame

//

// captureMovieImageAtTime

//

// Called when the "capture movie image" button is pressed.

// This code gets an NSImage for the current movie frame and

// displays it along with the current movie time in the image view

//

-(IBAction)captureMovieImageAtTime:(id)sender

{

    /*

    The QTMovie frameImageAtTime: method has been updated in Mac OS X Leopard to accept a dictionary of attributes.

    The dictionary of attributes may contain the following keys:

        QTMovieFrameImageSize

        QTMovieFrameImageType

        QTMovieFrameImageRepresentationsType

        QTMovieFrameImageOpenGLContext

        QTMovieFrameImagePixelFormat

        QTMovieFrameImageDeinterlaceFields

        QTMovieFrameImageHighQuality

        QTMovieFrameImageSingleField

    See QTMovie.h for additional information about these attributes.

    Usage examples of these are shown here:

    For the QTMovieFrameImageType attribute the possible values are as follows:

        QTMovieFrameImageTypeNSImage

        QTMovieFrameImageTypeCGImageRef

        QTMovieFrameImageTypeCIImage

        QTMovieFrameImageTypeCVPixelBufferRef

        QTMovieFrameImageTypeCVOpenGLTextureRef

    Here's how to ask for a particular image type (NSImage is the default):

        [attributes setObject:QTMovieFrameImageTypeCIImage forKey:QTMovieFrameImageType];

    For NSImage, the default representation is NSBitmapImageRep.

    Here's how to specify a particular representation:

        NSArray *typesArray = [NSArray arrayWithObject:@"NSBitmapImageRep"];

        [attributes setObject:typesArray forKey:QTMovieFrameImageRepresentationsType];

    Here's how to turn on high quality 

        [attributes setObject:[NSNumber numberWithBool:YES] forKey:QTMovieFrameImageHighQuality];

    etc.

    */

    NSMutableDictionary *attributes = [NSMutableDictionary dictionary];

    // We'll specify a custom size of 95 X 120 for the returned image:

    NSSize imageSize = NSMakeSize(95, 120);

    NSValue *sizeValue = [NSValue valueWithSize:imageSize];

    [attributes setObject:sizeValue forKey:QTMovieFrameImageSize];

    /* get the current movie time - we'll pass this value to the

       frameImageAtTime: method below */

    QTTime time = [mMovie currentTime];

    /* return an NSImage for the frame at the current time in the QTMovie */

    NSImage *theImage = [mMovie frameImageAtTime:time

                    withAttributes:attributes error:NULL];

    if (theImage)

    {

        /* set the new image on the view */

        [mImageView setImage:theImage];

        /* display the current movie time as a string below the 

          grabbed image in the window */

        [mMovieTime setStringValue:QTStringFromTime(time)];

    }

}

@end