在Swift中从AVCaptureSession捕获静止图像 [英] Capture still image from AVCaptureSession in Swift

问题描述

我有一个AVCaptureSession，可以在UIView中显示实时视频，并且我想将视频流的帧另存为UIImage.我一直在剖析我在互联网上不断看到的代码，但是第一行遇到了麻烦:

I have an AVCaptureSession that displays live video in a UIView, and I want to save a frame of the video stream as a UIImage. I've been dissecting the code I keep seeing around the internet, but I'm having trouble with the first line:

if let stillOutput = self.stillImageOutput {
    // Establish an AVCaptureConnection and capture a still image from it.
}

这给了我错误相机"没有名为"stillImageOutput"的成员.代码取决于能否从输出中获取视频连接.

This gives me the error 'Camera' does not have a member named 'stillImageOutput'. The code depends on being able to get the video connection from the output.

如果有帮助，我可以发布完整的代码块.谢谢！

I can post the full code block if that'd be helpful. Thanks!

推荐答案

一旦您拥有stillImageOutput，就可以使用以下方法捕获图像

Once you have stillImageOutput you can use following methods to capture image

 stillImageOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
    if captureSession.canAddOutput(stillImageOutput) {
        captureSession.addOutput(stillImageOutput)
    }

    // I had to add timer otherwise quality was messed up in iPad
    var timer = NSTimer.scheduledTimerWithTimeInterval(0.4, target: self, selector: Selector("getImage"), userInfo: nil, repeats: false)

比我要获取图像的功能

func getImage() {

    if let videoConnection = stillImageOutput.connectionWithMediaType(AVMediaTypeVideo) {
        stillImageOutput.captureStillImageAsynchronouslyFromConnection(videoConnection) {
            (imageDataSampleBuffer, error) -> Void in
            let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)

//          Use your image or store to Album

//          UIImageWriteToSavedPhotosAlbum(UIImage(data: imageData), nil, nil, nil)
            self.stopSession()

        }
    }

}

并停止会话并删除预览层

And to stop session and remove preview layer

func stopSession(){


    self.captureSession.stopRunning()
    self.previewLayer?.removeFromSuperlayer()

}

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