AVReaderWriter/RWProgressPanelController.m

/*
     File: RWProgressPanelController.m
 Abstract: n/a
  Version: 1.1
 
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 */
 
#import "RWProgressPanelController.h"
 
#import <QuartzCore/CATransaction.h>
 
@interface RWProgressPanelController ()
@property (nonatomic, retain) CALayer *frameLayer;
@end
 
@implementation RWProgressPanelController
 
- (void)dealloc
{
    [frameLayer release];
    [frameView release];
    [progressIndicator release];
    [interestingProgressValues release];
 
    [super dealloc];
}
 
- (void)windowDidLoad
{
    [super windowDidLoad];
    
    // Create a layer and set it on the view.  We will display video frames by adding sublayers as we go
    CALayer *localFrameLayer = [CALayer layer];
    [self setFrameLayer:localFrameLayer];
    NSView *localFrameView = [self frameView];
    [localFrameView setLayer:localFrameLayer];
    [localFrameView setWantsLayer:YES];
}
 
@synthesize progressIndicator=progressIndicator;
@synthesize frameView=frameView;
@synthesize frameLayer=frameLayer;
@synthesize delegate=delegate;
 
- (void)setPixelBuffer:(CVPixelBufferRef)pixelBuffer forProgress:(double)progress
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [[self progressIndicator] setDoubleValue:progress];
    });
    
    if (pixelBuffer == NULL)
        return;
    
    CALayer *localFrameLayer = [self frameLayer];
    
    // Calculate size of image
    CGSize frameLayerSize = [localFrameLayer frame].size;
    double imageLayerWidth = (double)CVPixelBufferGetWidth(pixelBuffer) * frameLayerSize.height / (double)CVPixelBufferGetHeight(pixelBuffer);
    double imageLayerHeight = frameLayerSize.height;
 
    // Calculate position of image in the progress bar
    double expectedImageCount = ceil(frameLayerSize.width / imageLayerWidth) + 2.0;
    double progressValueForFinalImage = (expectedImageCount - 1) / expectedImageCount;
    double imageLayerXPos = progress * (frameLayerSize.width - imageLayerWidth) / progressValueForFinalImage;
    double imageLayerYPos = 0.0;
    
    // If we haven't already done so, decide the set of progress values for which we will display an image
    if (!interestingProgressValues)
    {
        interestingProgressValues = [[NSMutableArray alloc] init];
 
        double progressDisplayInterval = 1.0 / expectedImageCount;
        for (NSInteger i = 0; i < (NSInteger)expectedImageCount; ++i)
            [interestingProgressValues addObject:[NSNumber numberWithDouble:((double)i * progressDisplayInterval)]];
    }
    
    // Determine whether we will display this frame
    BOOL displayThisFrame = NO;
    if ([interestingProgressValues count] > 0)
    {
        NSNumber *nextInterestingProgressValue = [interestingProgressValues objectAtIndex:0];
        // If we have progressed beyond the next progress value, make a note that we should display this one
        if (progress >= [nextInterestingProgressValue doubleValue])
        {
            displayThisFrame = YES;
            [interestingProgressValues removeObjectAtIndex:0];
        }
    }
    
    // If so, add a sublayer to the frame layer with the pixel buffer as its contents
    if (displayThisFrame)
    {
        CALayer *imageLayer = [[CALayer alloc] init];
 
        // Make contents for this layer
        NSImage *image = nil;
        id contents = (id)CVPixelBufferGetIOSurface(pixelBuffer);  // try IOSurface first
        if (!contents)
        {
            // Fall back to creating an NSImage from the image buffer, via CIImage
            CIImage *ciImage = [[CIImage alloc] initWithCVImageBuffer:pixelBuffer];
            NSCIImageRep *imageRep = [[NSCIImageRep alloc] initWithCIImage:ciImage];
            [ciImage release];
            image = [[NSImage alloc] initWithSize:[imageRep size]];
            [image addRepresentation:imageRep];
            [imageRep release];
                
            contents = image;
        }
        
        // Set contents, frame, and initial opacity
        [CATransaction begin];  // need an explicit transaction since we may not be executing on the main thread
        {
            [imageLayer setContents:contents];
            [imageLayer setFrame:CGRectMake(imageLayerXPos, imageLayerYPos, imageLayerWidth, imageLayerHeight)];
            [imageLayer setOpacity:0.0];
            [localFrameLayer addSublayer:imageLayer];
        }
        [CATransaction commit];
 
        // Animate opacity from 0.0 -> 1.0
        [CATransaction begin];
        {
            [CATransaction setAnimationDuration:1.5];
            [imageLayer setOpacity:1.0];
        }
        [CATransaction commit];
        
        [image release];
        [imageLayer release];
    }
}
 
- (IBAction)cancel:(id)sender
{
    id <RWProgressPanelControllerDelegate> localDelegate = [self delegate];
    if (localDelegate && [localDelegate respondsToSelector:@selector(progressPanelControllerDidCancel:)])
        [localDelegate progressPanelControllerDidCancel:self];
}
 
@end