翻转Quicktime预览&捕获 [英] Flipping Quicktime preview & capture

问题描述

我需要水平翻转我预览和捕获的视频。

I need to horizontally flip some video I'm previewing and capturing. A-la iChat, I have a webcam and want it to appear as though the user is looking in a mirror.

我在一个<$ c中预览Quicktime视频$ c> QTCaptureView 。我的捕获是逐帧的（因为我不会进入）与类似：

I'm previewing Quicktime video in a QTCaptureView. My capturing is done frame-by-frame (for reasons I won't get into) with something like:

imageRep = [NSCIImageRep imageRepWithCIImage: [CIImage imageWithCVImageBuffer: frame]];
image = [[NSImage alloc] initWithSize: [imageRep size]];
[image addRepresentation: imageRep];
[movie addImage: image forDuration: someDuration withAttributes: someAttributes];

任何提示？

推荐答案

您可以通过使用CIImage从捕获中获取并通过Core Image过滤器运行它来翻转图像。然后，您将生成的图像传递到您的映像代理，而不是原始的。代码看起来像这样：

You could do this by taking the CIImage you're getting from the capture and running it through a Core Image filter to flip the image around. You would then pass the resulting image into your image rep rather than the original one. The code would look something like:

CIImage* capturedImage = [CIImage imageWithCVImageBuffer:buffer];
NSAffineTransform* flipTransform = [NSAffineTransform transform];
CIFilter* flipFilter;
CIImage* flippedImage;

[flipTransform scaleByX:-1.0 y:1.0]; //horizontal flip
flipFilter = [CIImage filterWithName:@"CIAffineTransform"];
[flipFilter setValue:flipTransform forKey:@"inputTransform"];
[flipFilter setValue:capturedImage forKey:@"inputImage"];
flippedImage = [flipFilter valueForKey:@"outputImage"];
imageRep = [NSCIImageRep imageRepWithCIImage:flippedImage];
...

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