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我正在努力寻找解决这个问题的方法。我无法从我筛选过的各种示例和其他 SO 帖子中得出正面或反面。

我的问题是我想从 iPad 上的实时视频源中获取静止图像。我成功地看到了实时提要并且可以成功拍摄静止图像，但是我有两个问题：

  1. 实时供稿方向错误。我正在开发 iPad 应用程序以仅在横向模式下工作。出现的实时提要由于某种原因向右倾斜 90 度？（显然，此时我的 iPad 是横向的）

  2. 拍摄的静止图像被颠倒翻转（并且仍然向侧面倾斜，但是由于颠倒翻转而最终向左倾斜 90 度）。

我浏览了其他帖子，但我只是没有得到提供的修复，如何实现它们。希望有人可以在这里提供帮助。谢谢。

代码：

-(void)viewDidAppear:(BOOL)animated
{
AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetMedium;

//CALayer *viewLayer = self.cameraView.layer;
//NSLog(@"viewLayer = %@", viewLayer);

AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];

captureVideoPreviewLayer.frame = self.cameraView.bounds;
[self.cameraView.layer addSublayer:captureVideoPreviewLayer];

AVCaptureDevice *device = [self frontCamera];

NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
    // Handle the error appropriately.
    NSLog(@"ERROR: trying to open camera: %@", error);
}
[session addInput:input];
stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil];
[stillImageOutput setOutputSettings:outputSettings];

[session addOutput:stillImageOutput];
[session startRunning];
}



- (AVCaptureDevice *)frontCamera {
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in devices) {
    if ([device position] == AVCaptureDevicePositionFront) {
        return device;
    }
}
return nil;
}

- (IBAction)takePhoto:(id)sender {

AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in stillImageOutput.connections)
{
    for (AVCaptureInputPort *port in [connection inputPorts])
    {
        if ([[port mediaType] isEqual:AVMediaTypeVideo] )
        {
            videoConnection = connection;
            break;
        }
    }
    if (videoConnection) { break; }
}

//NSLog(@"about to request a capture from: %@", stillImageOutput);
[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
 {
     //CFDictionaryRef exifAttachments = CMGetAttachment( imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
     /*if (exifAttachments)
     {
         // Do something with the attachments.
         NSLog(@"attachements: %@", exifAttachments);
     }
     else
         NSLog(@"no attachments");*/

     NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
     UIImage *image = [[UIImage alloc] initWithData:imageData];

     self.imageView.image = image;
 }];
}
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