Tag: avcapturesession

如何从AVCapture中将图像裁剪到显示屏上显示的矩形: 这让我疯狂，因为我无法工作。我有以下情况：我正在使用AVCaptureSession和AVCaptureVideoPreviewLayer来创build我自己的相机界面。界面显示一个矩形。下面是填充整个屏幕的AVCaptureVideoPreviewLayer 。我希望以某种方式裁剪捕捉的图像，使得生成的图像精确显示在显示器上显示的内容。我的设置看起来像这样： _session = [[AVCaptureSession alloc] init]; AVCaptureSession *session = _session; session.sessionPreset = AVCaptureSessionPresetPhoto; AVCaptureDevice *camera = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; if (camera == nil) { [self showImagePicker]; _isSetup = YES; return; } AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session]; captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; captureVideoPreviewLayer.frame = self.liveCapturePlaceholderView.bounds; [self.liveCapturePlaceholderView.layer addSublayer:captureVideoPreviewLayer]; NSError *error; AVCaptureDeviceInput *input […]

iOS 7 AVCaptureMetadataOutput委托（QRCode扫描器）: 我试图用新的iOS 7function实现一个QRCode扫描器，但是我的代码没有调用主AVCaptureMetadataOutputObjectsDelegate方法。我已经使用AVFoundation摄像头之前和我目前的实现我有预览层运行没有问题。即使切换我的输出回到AVCaptureVideoDataOutputvalidation我的会话设置。我使用这个NSHipster职位作为指导，这里是我的代码到目前为止：接口： @import AVFoundation; @interface QRCodeViewController () <AVCaptureMetadataOutputObjectsDelegate> @property (strong, nonatomic) AVCaptureDevice* device; @property (strong, nonatomic) AVCaptureDeviceInput* input; @property (strong, nonatomic) AVCaptureMetadataOutput* output; @property (strong, nonatomic) AVCaptureSession* session; @property (strong, nonatomic) AVCaptureVideoPreviewLayer* preview; @end build立： – (void)setupCamera { // Device self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; // Input self.input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil]; […]

如何在不使用预设的情况下在iOS上录制video？: 在iOS上录制video更简单的方法是设置AVCaptureSession.sessionPreset 。但是，这并不适合我，因为我想控制像binning，稳定（电影，标准，或无）和ISO参数。我find了我想要的格式并将其分配给activeFormat ，但是当我尝试开始录制时，出现错误： Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[AVCaptureMovieFileOutput startRecordingToOutputFileURL:recordingDelegate:] No active/enabled connections' 这是我的初始化代码： let device = AVCaptureDevice.defaultDevice( withDeviceType: .builtInWideAngleCamera, mediaType: AVMediaTypeVideo, position: .back)! let session = AVCaptureSession() session.addInput(try! AVCaptureDeviceInput(device: device)) output = AVCaptureMovieFileOutput() session.addOutput(output) device.setFormatWithHighestIso() session.startRunning() setFormatWithHighestIso()被定义为： extension AVCaptureDevice { var goodVideoFormats: [AVCaptureDeviceFormat] { return (formats as! [AVCaptureDeviceFormat]) […]

支持使用AVCaptureSession进行video的后台录制: 我正在尝试在后台录制video，但是目前我的代码是在前台录制video时，应用程序将背景的方法。 -(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error 立即发生错误 error:Error Domain=AVFoundationErrorDomain Code=-11818 "Recording Stopped" UserInfo=0x176aa180 {NSLocalizedRecoverySuggestion=Stop any other actions using the recording device and try again., NSUnderlyingError=0x1766c0e0 "The operation couldn't be completed. (OSStatus error -16133.)", NSLocalizedDescription=Recording Stopped} 我在DemoApp-Info.plist中设置了以下值 Required background modes->App plays audio or streams audio/video using AirPlay Application does not run in background->NO […]

AVCAPTURE图像方向: 我有一个视图控制器，允许用户拍照。我将隐藏界限定为屏幕上的一个观点的界限。在这个视图上方，我有一个集合视图。因此，用户可以捕捉多个图片，然后将其添加到上面的集合视图。我在上面的预览中出现正确的方向时遇到问题。代码如下： @IBOutlet weak var imagePreviews: UICollectionView! @IBOutlet weak var imgPreview: UIView! var session: AVCaptureSession? var stillImageOutput: AVCaptureStillImageOutput? var videoPreviewLayer: AVCaptureVideoPreviewLayer? var images: [UIImage] = [UIImage]() var isLandscapeLeft : Bool = false var isLandscapeRight : Bool = false var isPortrait : Bool = false var isPortraitUpsideDown: Bool = false @IBAction func […]

从CVImageBufferRef获取内存的所有权: 我正在做一个简单的pipe道，从AVCaptureSession获取图像，在OpenCV中处理它们，然后在OpenGL中渲染它们。它基于RosyWriter，但没有audio和录音function。 OpenCV处理看起来像 – (void)processPixelBuffer: (CVImageBufferRef)pixelBuffer { CVPixelBufferLockBaseAddress( pixelBuffer, 0 ); int bufferWidth = CVPixelBufferGetWidth(pixelBuffer); int bufferHeight = CVPixelBufferGetHeight(pixelBuffer); unsigned char *pixel = (unsigned char *)CVPixelBufferGetBaseAddress(pixelBuffer); cv::Mat image = cv::Mat(bufferWidth,bufferHeight,CV_8UC4,pixel); //do any processing [self setDisplay_matrix:image]; CVPixelBufferUnlockBaseAddress( pixelBuffer, 0 ); } 在这个函数到目前为止，我没有复制任何内存，我想保持这种方式。问题是pixelBuffer可能仍然拥有display_image中包含的内存。处理代码可能会或可能不会分配新的内存并将其存储在映像中。如果处理没有分配新的内存，我必须使用display_matrix来传递pixelBuffer，以防止数据被擦除。有没有办法让我获得内存的所有权？我想销毁pixelBuffer而不破坏它指向的内存。在相关的说明中，LockBaseAddress究竟干什么？如果我传递一个cv :: Mat，CVImageBufferRef对将我必须locking基地址每次我想修改/使用cv :: Mat的数据？

裁剪AVCaptureVideoPreviewLayer输出到一个正方形: 抓取可视屏幕的裁剪UIImage时，遇到AVCaptureVideoPreviewLayer方法问题。目前它正在工作，但没有输出我需要的正确作物。我正在尝试输出一个正方形，但它（按其外观）似乎正在给出完整的高度并压缩图像。之前的图像显示实时屏幕和后图像显示图像一旦捕获button已被按下。你可以看到它已经垂直改变，以适应广场，但高度没有被垂直裁剪。捕获图像代码 [stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) { if (imageSampleBuffer != NULL) { NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer]; [self processImage:[UIImage imageWithData:imageData]]; } }]; 裁剪代码 – (void) processImage:(UIImage *)image { //process captured image, crop, resize and rotate haveImage = YES; CGRect deviceScreen = _previewLayer.bounds; CGFloat width = deviceScreen.size.width; CGFloat height […]

AVCapture会话捕获图像SWIFT: 我创build了一个AVCaptureSession来捕获video输出并通过UIView将其显示给用户。现在我想能够点击一个button（takePhoto方法），并显示在UIImageView中的会话的图像。我试图遍历每个设备连接，并尝试保存输出，但没有奏效。我的代码如下 let captureSession = AVCaptureSession() var stillImageOutput: AVCaptureStillImageOutput! @IBOutlet var imageView: UIImageView! @IBOutlet var cameraView: UIView! // If we find a device we'll store it here for later use var captureDevice : AVCaptureDevice? override func viewDidLoad() { // Do any additional setup after loading the view, typically from a nib. super.viewDidLoad() println("I […]

ios AVCaptureVideoPreviewLayer捕获当前图像: 一旦默认的iPhone相机应用程序拍摄照片，预览出现，图像animation到相机滚动button。我正试图复制这个animation。 session = [[AVCaptureSession alloc] init]; session.sessionPreset = AVCaptureSessionPresetPhoto; CALayer *viewLayer = self.vImagePreview.layer; NSLog(@"viewLayer = %@", viewLayer); captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session]; captureVideoPreviewLayer.frame = CGRectMake(0, 0, 322, 425); [self.vImagePreview.layer addSublayer:captureVideoPreviewLayer]; device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; NSError *error = nil; AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error]; if (!input) { // Handle the error appropriately. NSLog(@"ERROR: trying […]

更改AVCaptureDeviceInput导致AVAssetWriterStatusFailed: 我试图改变相机视图Front和Back它工作正常。如果录像没有翻转与Pause/Record选项它工作正常。但如果我们Flip Camera View一次然后，进一步录制video不保存哪些线索到AVAssetWriterStatusFailed – The operation could not be completed 。任何人都可以帮助我find我出错的地方吗？以下是我的代码。 Camera.m – (void)flipCamera{ NSArray * inputs = _session.inputs; for ( AVCaptureDeviceInput * INPUT in inputs ) { AVCaptureDevice * Device = INPUT.device ; if ( [ Device hasMediaType : AVMediaTypeVideo ] ) { AVCaptureDevicePosition position = Device . position ; AVCaptureDevice * […]