如何在cocos3d中拍攝相機

Question

我制作了增強現實應用程序，需要從相機拍攝照片並將其覆蓋3D模型。

我已經可以拍攝帶有3d徽標的gl視圖的屏幕截圖，但是我不知道如何從相機中拍攝圖像。

怎么也從相機拍照？

Answer 1

如果您打算顯示來自攝像機的實時視頻流，則可以使用GPUImage 。

如果只需要拍攝靜止圖像，請使用AVFoundation的AVCaptureStillImageOutput。 請參閱AVCam-Apple的示例代碼 ，您可以在其中剝離預覽實時視頻的部分（ AVCaptureVideoPreviewLayer ），並在需要時僅捕獲靜止圖像。

//you'll need to create an AVCaptureSession

_session = [[AVCaptureSession alloc] init];

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

//there are steps here where you adjust capture device if needed

NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];

if ([device supportsAVCaptureSessionPreset: AVCaptureSessionPreset640x480]) {
    _session.sessionPreset = AVCaptureSessionPreset640x480;
}

_stillImageOutput = [[AVCaptureStillImageOutput alloc] init];

NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil];
[_stillImageOutput setOutputSettings:outputSettings];
[outputSettings release];

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; }
}

[_session addOutput: _stillImageOutput];

[_session startRunning];

此代碼用於拍照：

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; }
}

[_stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) {

    if (imageSampleBuffer != NULL) {
        NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
        UIImage *image = [UIImage imageWithData: imageData];
        //do something with image or data
    }
}

希望能幫助到你。