iphone - 倒车摄像头倒置

Question

我使用 gpuimage 来构建一个摄影应用程序。但是当我选择前置摄像头的时候，后面出现的摄像头图片是反转的（左，右）这里的代码：

 stillCamera = [[GPUImageStillCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionBack]; 
stillCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
filter = [[GPUImageRGBFilter alloc] init];

[stillCamera addTarget:filter];
GPUImageView *filterView = (GPUImageView *)self.view;
[filter addTarget:filterView];

[stillCamera startCameraCapture];

谁能告诉我我遇到了什么问题？非常感谢！

Answer 1

尝试这个...

stillCamera = [[GPUImageStillCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionBack]; 
stillCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
stillCamera.horizontallyMirrorFrontFacingCamera = NO;
stillCamera.horizontallyMirrorRearFacingCamera = NO;

filter = [[GPUImageRGBFilter alloc] init];

[stillCamera addTarget:filter];
GPUImageView *filterView = (GPUImageView *)self.view;
[filter addTarget:filterView];

[stillCamera startCameraCapture];

Answer 2

尝试这个 ：

[filterView setInputRotation:kGPUImageFlipHorizonal atIndex:0];

Answer 3

我认为您可以轻松更改最终图像：

UIImage *finalImage = //image from the camera

UIImage * flippedImage = [UIImage imageWithCGImage:finalImage.CGImage scale:finalImage.scale orientation:UIImageOrientationLeftMirrored];

Answer 4

只需设置：

stillCamera.horizontallyMirrorFrontFacingCamera = YES;

将解决这个问题。