如何在Xcode中通过帧获取图片帧
嗨，我想通过iPhone使用iphone后置摄像头获取相框。 我到目前为止所做的。
（IBAction）showCameraUI {[self startCameraControllerFromViewController：self usingDelegate：self]; }
（BOOL）startCameraControllerFromViewController：（UIViewController *）controller usingDelegate：（id）delegate {
if (([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypeCamera] == NO)
|| (delegate == nil)
|| (controller == nil))
return NO;
UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
// Displays a control that allows the user to choose picture or
// movie capture, if both are available:
cameraUI.mediaTypes =
[UIImagePickerController availableMediaTypesForSourceType:
UIImagePickerControllerSourceTypeCamera];
// Hides the controls for moving & scaling pictures, or for
// trimming movies. To instead show the controls, use YES.
cameraUI.allowsEditing = NO;
cameraUI.delegate = delegate;
cameraUI.showsCameraControls=NO;
cameraUI.navigationBarHidden=YES;
cameraUI.toolbarHidden=YES;
cameraUI.wantsFullScreenLayout=YES;
cameraUI.cameraViewTransform = CGAffineTransformScale(cameraUI.cameraViewTransform, CAMERA_SCALAR_SX, CAMERA_SCALAR_SY);
UIButton *btnRecording = [UIButton buttonWithType:UIButtonTypeRoundedRect];
CGRect buttonRect =CGRectMake(190 , 420, 100, 39); // position in the parent view and set the size of the button
btnRecording.frame = buttonRect;
[btnRecording setTitle:@"Recording" forState:UIControlStateNormal];
// add targets and actions
[btnRecording addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
cameraUI.cameraOverlayView= btnRecording;
[controller presentModalViewController: cameraUI animated: YES];
return YES;
}
// Create the session
AVCaptureSession *session = [[AVCaptureSession alloc] init];
// session.AVCaptureTorchModeOn = YES;
// Configure the session to produce lower resolution video frames, if your
// processing algorithm can cope. We'll specify medium quality for the
// chosen device.
session.sessionPreset = AVCaptureSessionPresetLow;
// Find a suitable AVCaptureDevice
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
[device lockForConfiguration:nil];
[device setTorchMode:AVCaptureTorchModeOn]; // use AVCaptureTorchModeOff to turn off
[device unlockForConfiguration];
// Create a device input with the device and add it to the session.
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device
error:&error];
if (!input) {
// Handling the error appropriately.
}
[session addInput:input];
// Create a VideoDataOutput and add it to the session
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init] ;
// output.alwaysDiscardsLateVideoFrames = YES; [session addOutput：output];
dispatch_queue_t queue = dispatch_queue_create("MyQueue", NULL);
[output setSampleBufferDelegate:self queue:queue];
dispatch_release(queue);
// Specify the pixel format
output.videoSettings =
[NSDictionary dictionaryWithObject:
[NSNumber numberWithInt:kCVPixelFormatType_32BGRA]
forKey:(id)kCVPixelBufferPixelFormatTypeKey];
// If you wish to cap the frame rate to a known value, such as 15 fps, set
// minFrameDuration.
// output.minFrameDuration = CMTimeMake（1，1）;
// Start the session running to start the flow of data
NSLog(@"session is going to start at here");
[session startRunning];
// Assign session to an ivar.
//[self setSession:session];
}
//从样本缓冲区数据创建一个UIImage - （UIImage *）imageFromSampleBuffer :( CMSampleBufferRef）sampleBuffer {NSLog（@“picture is getting”）; CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer（sampleBuffer）; //锁定像素缓冲区的基地址CVPixelBufferLockBaseAddress（imageBuffer，0）;
// Get the number of bytes per row for the pixel buffer
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
// Get the pixel buffer width and height
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
// Create a device-dependent RGB color space
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
if (!colorSpace)
{
NSLog(@"CGColorSpaceCreateDeviceRGB failure");
return nil;
}
// Get the base address of the pixel buffer
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
// Get the data size for contiguous planes of the pixel buffer.
size_t bufferSize = CVPixelBufferGetDataSize(imageBuffer);
// Create a Quartz direct-access data provider that uses data we supply
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, baseAddress, bufferSize,
NULL);
// Create a bitmap image from data supplied by our data provider
CGImageRef cgImage =
CGImageCreate(width,
height,
8,
32,
bytesPerRow,
colorSpace,
kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little,
provider,
NULL,
true,
kCGRenderingIntentDefault);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
// Create and return an image object representing the specified Quartz image
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
return image;
}
//写入示例缓冲区时调用的委托例程 - （void）captureOutput：（AVCaptureOutput *）captureOutput didOutputSampleBuffer :( CMSampleBufferRef）sampleBuffer fromConnection：（AVCaptureConnection *）connection {//从样本缓冲区数据创建UIImage NSLog @“图片越来越”）; UIImage * image = [self imageFromSampleBuffer：sampleBuffer];
// [self.delegate cameraCaptureGotFrame：image]; }
现在委托“captureOutput”没有获得通话。 我不知道我在做什么错。 这将帮助我。 提前致谢。
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