iPhone AVFoundation相机方向
iPhone AVFoundation相机方向
提问于 2010-09-08 05:31:31
我费了好大劲才让AVFoundation摄像头拍摄到正确方向(即设备方向)的照片，但我就是不能让它工作。
我看过教程，看过WWDC演示文稿，下载过WWDC示例程序，但即使这样也做不到。
我的应用程序中的代码是...
AVCaptureConnection *videoConnection = [CameraVC connectionWithMediaType:AVMediaTypeVideo fromConnections:[imageCaptureOutput connections]];
if ([videoConnection isVideoOrientationSupported])
{
[videoConnection setVideoOrientation:[UIApplication sharedApplication].statusBarOrientation];
}
[imageCaptureOutput captureStillImageAsynchronouslyFromConnection:videoConnection
completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error)
{
if (imageDataSampleBuffer != NULL)
{
//NSLog(@"%d", screenOrientation);
//CMSetAttachment(imageDataSampleBuffer, kCGImagePropertyOrientation, [NSString stringWithFormat:@"%d", screenOrientation], 0);
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
[self processImage:image];
}
}];(processImage使用相同的writeImage...方法作为WWDC代码)
WWDC应用程序的代码是...
AVCaptureConnection *videoConnection = [AVCamDemoCaptureManager connectionWithMediaType:AVMediaTypeVideo fromConnections:[[self stillImageOutput] connections]];
if ([videoConnection isVideoOrientationSupported]) {
[videoConnection setVideoOrientation:AVCaptureVideoOrientationPortrait];
}
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection
completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer != NULL) {
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeImageToSavedPhotosAlbum:[image CGImage]
orientation:(ALAssetOrientation)[image imageOrientation]
completionBlock:^(NSURL *assetURL, NSError *error){
if (error) {
id delegate = [self delegate];
if ([delegate respondsToSelector:@selector(captureStillImageFailedWithError:)]) {
[delegate captureStillImageFailedWithError:error];
}
}
}];
[library release];
[image release];
} else if (error) {
id delegate = [self delegate];
if ([delegate respondsToSelector:@selector(captureStillImageFailedWithError:)]) {
[delegate captureStillImageFailedWithError:error];
}
}
}];在他们的代码一开始，他们将AVOrientation设置为肖像，这看起来很奇怪，但我正在尝试让它检测设备的当前方向并使用它。
正如你所看到的，我已经让UIApplication sharedApplicationstatusBarOrientation尝试得到这个，但它仍然只保存肖像中的照片。
有没有人能就我需要做的事情提供任何帮助或建议？
谢谢!
奥利弗
回答 12
Stack Overflow用户
回答已采纳
发布于 2010-09-08 06:16:23
嗯，我花了很长时间才开始水力压裂，但我做到了！
我要找的代码是
[UIDevice currentDevice].orientation;这是这样的
AVCaptureConnection *videoConnection = [CameraVC connectionWithMediaType:AVMediaTypeVideo fromConnections:[imageCaptureOutput connections]];
if ([videoConnection isVideoOrientationSupported])
{
[videoConnection setVideoOrientation:[UIDevice currentDevice].orientation];
}而且它工作得很完美:D
哇，哇！
Stack Overflow用户
发布于 2013-09-19 23:54:13
这是不是更干净一点？
AVCaptureVideoOrientation newOrientation;
switch ([[UIDevice currentDevice] orientation]) {
case UIDeviceOrientationPortrait:
newOrientation = AVCaptureVideoOrientationPortrait;
break;
case UIDeviceOrientationPortraitUpsideDown:
newOrientation = AVCaptureVideoOrientationPortraitUpsideDown;
break;
case UIDeviceOrientationLandscapeLeft:
newOrientation = AVCaptureVideoOrientationLandscapeRight;
break;
case UIDeviceOrientationLandscapeRight:
newOrientation = AVCaptureVideoOrientationLandscapeLeft;
break;
default:
newOrientation = AVCaptureVideoOrientationPortrait;
}
[stillConnection setVideoOrientation: newOrientation];Stack Overflow用户
发布于 2011-06-14 04:35:14
下面是来自AVCam的，我也添加了它：
- (void)deviceOrientationDidChange{
UIDeviceOrientation deviceOrientation = [[UIDevice currentDevice] orientation];
AVCaptureVideoOrientation newOrientation;
if (deviceOrientation == UIDeviceOrientationPortrait){
NSLog(@"deviceOrientationDidChange - Portrait");
newOrientation = AVCaptureVideoOrientationPortrait;
}
else if (deviceOrientation == UIDeviceOrientationPortraitUpsideDown){
NSLog(@"deviceOrientationDidChange - UpsideDown");
newOrientation = AVCaptureVideoOrientationPortraitUpsideDown;
}
// AVCapture and UIDevice have opposite meanings for landscape left and right (AVCapture orientation is the same as UIInterfaceOrientation)
else if (deviceOrientation == UIDeviceOrientationLandscapeLeft){
NSLog(@"deviceOrientationDidChange - LandscapeLeft");
newOrientation = AVCaptureVideoOrientationLandscapeRight;
}
else if (deviceOrientation == UIDeviceOrientationLandscapeRight){
NSLog(@"deviceOrientationDidChange - LandscapeRight");
newOrientation = AVCaptureVideoOrientationLandscapeLeft;
}
else if (deviceOrientation == UIDeviceOrientationUnknown){
NSLog(@"deviceOrientationDidChange - Unknown ");
newOrientation = AVCaptureVideoOrientationPortrait;
}
else{
NSLog(@"deviceOrientationDidChange - Face Up or Down");
newOrientation = AVCaptureVideoOrientationPortrait;
}
[self setOrientation:newOrientation];
}并确保将以下内容添加到init方法中：
NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[notificationCenter addObserver:self
selector:@selector(deviceOrientationDidChange)
name:UIDeviceOrientationDidChangeNotification object:nil];
[self setOrientation:AVCaptureVideoOrientationPortrait];页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/3662930
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