//

//  MyDocument.m

//  StillMotion

//

/*

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

#import "MyDocument.h"

@implementation MyDocument

- (NSString *)windowNibName

{

    return @"MyDocument";

}

- (void)windowControllerDidLoadNib:(NSWindowController *) aController

{

    NSError *error = nil;

    [super windowControllerDidLoadNib:aController];

    [[aController window] setDelegate:self];

    if (!mMovie) {

        // Create an empty movie that writes to mutable data in memory

        mMovie = [[QTMovie alloc] initToWritableData:[NSMutableData data] error:&error];

        if (!mMovie) {

            [[NSAlert alertWithError:error] runModal];

            return;

        }

    }

    [mMovieView setMovie:mMovie];

    if (!mCaptureSession) {

        // Set up a capture session that outputs raw frames

        BOOL success;

        mCaptureSession = [[QTCaptureSession alloc] init];

        // Find a video device

        QTCaptureDevice *device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];

        success = [device open:&error];

        if (!success) {

            [[NSAlert alertWithError:error] runModal];

            return;

        }

        // Add a device input for that device to the capture session

        mCaptureDeviceInput = [[QTCaptureDeviceInput alloc] initWithDevice:device];

        success = [mCaptureSession addInput:mCaptureDeviceInput error:&error];

        if (!success) {

            [[NSAlert alertWithError:error] runModal];

            return;

        }

        // Add a decompressed video output that returns raw frames to the session

        mCaptureDecompressedVideoOutput = [[QTCaptureDecompressedVideoOutput alloc] init];

        [mCaptureDecompressedVideoOutput setDelegate:self];

        success = [mCaptureSession addOutput:mCaptureDecompressedVideoOutput error:&error];

        if (!success) {

            [[NSAlert alertWithError:error] runModal];

            return;

        }

        // Preview the video from the session in the document window

        [mCaptureView setCaptureSession:mCaptureSession];

        // Start the session

        [mCaptureSession startRunning];

    }

}

- (void)windowWillClose:(NSNotification *)notification

{

    [mCaptureSession stopRunning];

    QTCaptureDevice *device = [mCaptureDeviceInput device];

    if ([device isOpen])

        [device close];    

}

- (void)dealloc

{

    [mMovie release];

    [mCaptureSession release];

    [mCaptureDeviceInput release];

    [mCaptureDecompressedVideoOutput release];

    [super dealloc];

}

- (BOOL)readFromURL:(NSURL *)absoluteURL ofType:(NSString *)typeName error:(NSError **)outError

{

    QTMovie *newMovie = [[QTMovie alloc] initWithURL:absoluteURL error:outError];

    if (newMovie) {

        [newMovie setAttribute:[NSNumber numberWithBool:YES] forKey:QTMovieEditableAttribute];

        [mMovie release];

        mMovie = newMovie;

    }

    return (newMovie != nil);

}

- (BOOL)writeToURL:(NSURL *)absoluteURL ofType:(NSString *)typeName error:(NSError **)outError

{

    return [mMovie writeToFile:[absoluteURL path] withAttributes:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:QTMovieFlatten] error:outError];

}

// This delegate method is called whenever the QTCaptureDecompressedVideoOutput receives a frame

- (void)captureOutput:(QTCaptureOutput *)captureOutput didOutputVideoFrame:(CVImageBufferRef)videoFrame withSampleBuffer:(QTSampleBuffer *)sampleBuffer fromConnection:(QTCaptureConnection *)connection

{

    // Store the latest frame

    // This must be done in a @synchronized block because this delegate method is not called on the main thread

    CVImageBufferRef imageBufferToRelease;

    CVBufferRetain(videoFrame);

    @synchronized (self) {

        imageBufferToRelease = mCurrentImageBuffer;

        mCurrentImageBuffer = videoFrame;

    }

    CVBufferRelease(imageBufferToRelease);

}

- (IBAction)addFrame:(id)sender

{

    // Get the most recent frame

    // This must be done in a @synchronized block because the delegate method that sets the most recent frame is not called on the main thread

    CVImageBufferRef imageBuffer;

    @synchronized (self) {

        imageBuffer = CVBufferRetain(mCurrentImageBuffer);

    }

    if (imageBuffer) {

        // Create an NSImage and add it to the movie

        NSCIImageRep *imageRep = [NSCIImageRep imageRepWithCIImage:[CIImage imageWithCVImageBuffer:imageBuffer]];

        NSImage *image = [[[NSImage alloc] initWithSize:[imageRep size]] autorelease];

        [image addRepresentation:imageRep];

        CVBufferRelease(imageBuffer);

        [mMovie addImage:image forDuration:QTMakeTime(1, 10) withAttributes:[NSDictionary dictionaryWithObjectsAndKeys:

                                                                             @"jpeg", QTAddImageCodecType,

                                                                             nil]];

        [mMovie setCurrentTime:[mMovie duration]];

        [mMovieView setNeedsDisplay:YES];

        [self updateChangeCount:NSChangeDone];

    }

}

@end