Question

我有View - “cameraView”，用于通过glView显示来自摄像机的视图。当我设置glView = GLKView(frame: self.cameraView.bounds, context: glContext!)时就像它填满了整个cameraView，但ciContext?.drawImage(image, inRect:self.cameraView.bounds, fromRect:image.extent)显示的视频帧只填充了视图的1/4（在iPhone 5c上测试过），但在iPad2上一切都很好。

glContext = EAGLContext(API: .OpenGLES2)
glView = GLKView(frame: self.cameraView.bounds, context: glContext!)
ciContext = CIContext(EAGLContext: glContext!)
self.cameraView.addSubview(glView!)

...

func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!)
{
    if photoTaken == false
    {
        let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)!

        let image = CIImage(CVPixelBuffer: pixelBuffer)

        if glContext != EAGLContext.currentContext()
        {
            EAGLContext.setCurrentContext(glContext)
        }

        glView?.bindDrawable()
        ciContext?.drawImage(image, inRect:self.cameraView.bounds, fromRect:image.extent)//?
        glView?.display()
    }
}

感谢您的帮助！

Answer 1

ciContext.drawImage（...）以像素为单位绘制图像，因此图像“inRect：”的宽度和高度必须乘以UIView.contentScaleFactor，旧版iPhone上为1.0，分辨率较高的iPhone上为2.0和3.0。

视频帧仅填充视图的1/4 - GL

1 个答案: