AVCaptureSession 捕获图像横向模式

Posted 2023-03-12

【中文标题】AVCaptureSession 捕获图像横向模式

【英文标题】：AVCaptureSession capture image landscape mode

【发布时间】：2013-07-24 06:27:56

【问题描述】：

我正在使用 AVCaptureSession 拍照并将图片存储到相册。当我单击按钮时，它会拍摄快照并存储到相册。但是当我使用横向模式时，然后单击它存储横向模式图像的按钮。预览图像时，它处于纵向模式。

代码：

- (void)viewDidLoad

    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [self setCaptureSession:[[AVCaptureSession alloc] init]];

    [self  addVideoInputFrontCamera:NO]; // set to YES for Front Camera, No for Back camera

    [self  addStillImageOutput];

    [self setPreviewLayer:[[AVCaptureVideoPreviewLayer alloc] initWithSession:[self captureSession]] ];

    //  UIView *newView = [[UIView alloc] initWithFrame:self.view.bounds];
    // [newView.layer addSublayer: self.previewLayer];
    // [self.view addSubview: newView];

    //previewLayer.frame=self.previewLayer.bounds;

    [[self previewLayer] setVideoGravity:AVLayerVideoGravityResizeAspectFill];

    //  [[self previewLayer] setVideoGravity:AVLayerVideoGravityResize];


  //  self.previewLayer.orientation = AVCaptureVideoOrientationPortrait;

    CGRect layerRect = [[[self view] layer] bounds];

    [[self previewLayer]setBounds:layerRect];
    [[self  previewLayer] setPosition:CGPointMake(CGRectGetMidX(layerRect),CGRectGetMidY(layerRect))];
    [[[self view] layer] addSublayer:[self  previewLayer]];

     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(saveImageToPhotoAlbum) name:kImageCapturedSuccessfully object:nil];

    [[self captureSession] startRunning];

    camera=[UIButton buttonWithType:UIButtonTypeCustom];
    [camera setImage:[UIImage imageNamed:@"button.png"] forState:UIControlStateNormal];
    [camera setFrame:CGRectMake(150, 10, 40, 30)];
    [camera addTarget:self action:@selector(takephoto:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:camera];

捕捉快照：

- (void)takephoto:(id)sender

    [self captureStillImage];


- (void)captureStillImage

    AVCaptureConnection *videoConnection = nil;
    for (AVCaptureConnection *connection in [[self 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: %@", [self stillImageOutput]);

    [[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection
                                                         completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error) 
                                                             CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, NULL);
                                                             if (exifAttachments) 
                                                                 NSLog(@"attachements: %@", exifAttachments);
                                                              else 
                                                                 NSLog(@"no attachments");
                                                             

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


                                                            [self setStillImage:image];



                                                             //  [image release];
                                                             [[NSNotificationCenter defaultCenter] postNotificationName:kImageCapturedSuccessfully object:nil];

                                                         ];

我在横向模式下使用self.previewLayer.orientation = UIInterfaceOrientationLandscapeLeft;

【参考方案1】：

除了 previewLayer 方向，您还应该设置 videoOrientation 来纠正这个问题。

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

之后

[videoConnection setVideoOrientation:AVCaptureVideoOrientationLandscapeLeft];

通过在横向或纵向模式下检查天气应用程序来设置方向..