在不使用 uiimagepicker 控制器的情况下捕获图像和视频

Posted 2023-03-05

【中文标题】在不使用 uiimagepicker 控制器的情况下捕获图像和视频

【英文标题】：Capture image & Video without using uiimagepicker controller

【发布时间】：2012-07-11 11:15:53

【问题描述】：

我需要在不打开 imagepickerController 的情况下捕获图像和视频。

【问题讨论】：

这个问题可能会有所帮助：***.com/questions/3457774/…

【参考方案1】：

您可以使用 AVCaptureSession 捕获视频和照片

参考iPhone SDK 4 AVFoundation - How to use captureStillImageAsynchronouslyFromConnection correctly?

-(void) viewDidAppear:(BOOL)animated

    AVCaptureSession *session = [[AVCaptureSession alloc] init];
    session.sessionPreset = AVCaptureSessionPresetMedium;

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

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

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

    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    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];


-(IBAction) captureNow

    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.vImage.image = image;
     ];