iPad横向模式下的AVCAPTERSECTION的问题
-
27-12-2019 - |
题
我一直在尝试从前面相机捕获帧并在视图上呈现。这是我的代码
_session = [[AVCaptureSession alloc] init];
_session.sessionPreset = AVCaptureSessionPreset640x480;
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
AVCaptureDeviceInput *deviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:device error:&error];
if (deviceInput) {
[_session addInput:deviceInput];
}
else {
DDLogInfo(@"Some wierd shit happened");
return;
}
// Session output
/*
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[_session addOutput:output];
output.metadataObjectTypes = @[AVMetadataObjectTypeFace];
AVCaptureConnection *connection = [output connectionWithMediaType:AVMediaTypeMetadata];
connection.videoOrientation = AVCaptureVideoOrientationLandscapeLeft;
*/
// Session output
AVCaptureMovieFileOutput *videoOutput = [[AVCaptureMovieFileOutput alloc] init];
[_session addOutput:videoOutput];
AVCaptureConnection *connection = [videoOutput connectionWithMediaType:AVMediaTypeVideo];
connection.videoOrientation = AVCaptureVideoOrientationPortrait;
// Preview layer
_previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
_previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
_previewLayer.frame = CGRectMake(0, 0, self.middleView.frame.size.width, self.middleView.frame.size.height);
[self.middleView.layer addSublayer:_previewLayer];
[_session startRunning];
.
此问题是,当我的ipad是横向时,表示层上的图像旋转90度。我该如何解决?我一直在浏览堆栈溢出,试图用生成的东西做点什么,但是唉无济于事。
解决方案
解决了它,现在它正在所有方向工作。我们需要设置这个
_previewLayer.connection.videoOrientation = [self videoOrientationFromCurrentDeviceOrientation];
.
方法是:
- (AVCaptureVideoOrientation) videoOrientationFromCurrentDeviceOrientation {
switch (self.interfaceOrientation) {
case UIInterfaceOrientationPortrait: {
return AVCaptureVideoOrientationPortrait;
}
case UIInterfaceOrientationLandscapeLeft: {
return AVCaptureVideoOrientationLandscapeLeft;
}
case UIInterfaceOrientationLandscapeRight: {
return AVCaptureVideoOrientationLandscapeRight;
}
case UIInterfaceOrientationPortraitUpsideDown: {
return AVCaptureVideoOrientationPortraitUpsideDown;
}
}
}
.
还要捕获输出,我们需要设置:
AVCaptureConnection *output2VideoConnection = [videoOutput connectionWithMediaType:AVMediaTypeVideo];
output2VideoConnection.videoOrientation = [self videoOrientationFromCurrentDeviceOrientation];
. 其他提示
在 swift 3 :
首先,我们必须设置megamanx do
等生成的播放码previewLayer.connection.videoOrientation = self.videoOrientationFromCurrentDeviceOrientation()
.
方法是:
func videoOrientationFromCurrentDeviceOrientation() -> AVCaptureVideoOrientation {
switch UIApplication.shared.statusBarOrientation {
case .portrait:
return AVCaptureVideoOrientation.portrait
case .landscapeLeft:
return AVCaptureVideoOrientation.landscapeLeft
case .landscapeRight:
return AVCaptureVideoOrientation.landscapeRight
case .portraitUpsideDown:
return AVCaptureVideoOrientation.portraitUpsideDown
default:
// Can this happen?
return AVCaptureVideoOrientation.portrait
}
}
.
然后我们还必须在用户旋转设备时处理previewLayer.connection.videoOrientation
(方法来自 )
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
coordinator.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) -> Void in
self.previewLayer.connection.videoOrientation = self.videoOrientationFromCurrentDeviceOrientation()
}, completion: { (UIViewControllerTransitionCoordinatorContext) -> Void in
// Finish Rotation
})
super.viewWillTransition(to: size, with: coordinator)
}
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