Rotating AV video preview area on iPad - ios

I'd like to use the video preview layer on the iPhone and the iPad, but on the iPad it doesn't rotate and it has the wrong height.
Here is the code I have:
- (void)capture
{
AVCaptureSession *session = [[AVCaptureSession alloc] init];
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device
error:&error];
if (!input)
{
NSLog(#"Error: %#", error);
return;
}
[session addInput:input];
//Turn on point autofocus for middle of view
[device lockForConfiguration:&error];
CGPoint point = CGPointMake(0.5,0.5);
[device setFocusPointOfInterest:point];
[device setFocusMode:AVCaptureFocusModeContinuousAutoFocus];
[device unlockForConfiguration];
//Add the metadata output device
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[session addOutput:output];
NSLog(#"%lu",output.availableMetadataObjectTypes.count);
for (NSString *s in output.availableMetadataObjectTypes)
NSLog(#"%#",s);
//You should check here to see if the session supports these types, if they aren't support you'll get an exception
output.metadataObjectTypes = #[AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeUPCECode, AVMetadataObjectTypeQRCode];
output.rectOfInterest = self.livevideo.bounds;
AVCaptureVideoPreviewLayer *newCaptureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
newCaptureVideoPreviewLayer.frame = self.view.layer.bounds;
newCaptureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.livevideo.layer insertSublayer:newCaptureVideoPreviewLayer above:self.livevideo.layer];
[session startRunning];
}
And:
- (void)captureFront
{
AVCaptureSession *session = [[AVCaptureSession alloc] init];
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device
error:&error];
if (!input)
{
NSLog(#"Error: %#", error);
return;
}
[session addInput:input];
//Turn on point autofocus for middle of view
[device lockForConfiguration:&error];
CGPoint point = CGPointMake(0.5,0.5);
[device setFocusPointOfInterest:point];
[device setFocusMode:AVCaptureFocusModeContinuousAutoFocus];
[device unlockForConfiguration];
//Add the metadata output device
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[session addOutput:output];
NSLog(#"%lu",output.availableMetadataObjectTypes.count);
for (NSString *s in output.availableMetadataObjectTypes)
NSLog(#"%#",s);
//You should check here to see if the session supports these types, if they aren't support you'll get an exception
output.metadataObjectTypes = #[AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeUPCECode, AVMetadataObjectTypeQRCode];
output.rectOfInterest = self.livevideo.bounds;
AVCaptureVideoPreviewLayer *newCaptureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
newCaptureVideoPreviewLayer.frame = self.view.layer.bounds;
newCaptureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[session startRunning];
}
Image

Related

App crash while i take photo using AVCaptureSession and go another view and again back to that camera view

Hello My App crash while I take photo using AVCaptureSession and go another view when I pop to my camera view app crash after 2-3 second.
I use this code for Open camera using AVCaptureSession.
session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetPhoto;
captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
[captureVideoPreviewLayer setBackgroundColor:[[UIColor blackColor] CGColor]];
[captureVideoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
rootLayer = [_MainPreviewVIEW layer];
[rootLayer addSublayer:captureVideoPreviewLayer];
NSArray *devices = [AVCaptureDevice devices];
for (AVCaptureDevice *device in devices)
{
NSLog(#"Device name: %#", [device localizedName]);
if ([device hasMediaType:AVMediaTypeVideo])
{
if ([device position] == AVCaptureDevicePositionBack)
{
NSLog(#"Device position : back");
backCamera = device;
[device lockForConfiguration:nil];
[device unlockForConfiguration];
}
}
}
NSError *error = nil;
input = [AVCaptureDeviceInput deviceInputWithDevice:backCamera error:&error];
if (!input)
{
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];
I Got this error message.
[Viewcontroller respondsToSelector:]: message sent to deallocated
instance 0x148286690**
I Use this method for take picture.
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection1 in stillImageOutput.connections)
{
for (AVCaptureInputPort *port in [connection1 inputPorts])
{
if ([[port mediaType] isEqual:AVMediaTypeVideo] )
{
videoConnection = connection1;
break;
}
}
if (videoConnection)
{
break;
}
}
NSLog(#"about to request a capture from: %#", stillImageOutput);
[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
{
if (imageSampleBuffer != NULL)
{
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
Catchimg=[[UIImage alloc]initWithData:imageData];
[session stopRunning];
}
}];
Then After I have use simple push view using navigation controller.
when I back to again this camera view it getting crash after 2-3 second.

I am trying to switch this code to use the front camera

I am new to programming, and trying to fix this code to use the front camera instead of defaulting to the back. I'm not sure what I need to change to make this work properly.
Here is my sample code:
-(void)viewWillAppear:(BOOL)animated{
session = [[AVCaptureSession alloc] init];
[session setSessionPreset:AVCaptureSessionPresetPhoto];
AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error;
AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];
if ([session canAddInput:deviceInput]) {
[session addInput:deviceInput];
}
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
CALayer *rootLayer = [[self view] layer];
[rootLayer setMasksToBounds:YES];
CGRect frame = self.frameForCapture.frame;
[previewLayer setFrame:frame];
[rootLayer insertSublayer:previewLayer atIndex:0];
stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:AVVideoCodecJPEG, AVVideoCodecKey, nil];
[stillImageOutput setOutputSettings:outputSettings];
[session addOutput:stillImageOutput];
[session startRunning];
Replace this:
AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error;
AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];
With this:
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
AVCaptureDevice *frontCamera;
for (AVCaptureDevice *dev in devices) {
if (dev.position == AVCaptureDevicePositionFront) {
frontCamera = dev;
break;
}
}
if (!frontCamera) {
NSLog(#"No front camera found!");
// Handle no front camera error
}
NSError *error;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:frontCamera error:&error];

AVCaptureSession doesn't read PDF417 with front camera but works with the back

I'm trying to do an AVCaptureSession on the front camera to read a PDF417 barcode, but it refuses to read the same barcodes on the front camera that it will read no problem on the back. Is there a setting I'm missing or does it have to do with the front camera appearing "mirrored?"
I tried the same thing with a QR code and it works no problem on both the front and back cameras.
_session = [[AVCaptureSession alloc] init];
NSArray *videoDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for( AVCaptureDevice *device in videoDevices )
{
if( device.position == AVCaptureDevicePositionFront )
{
_device = device;
break;
}
}
// couldn't find one on the front, so just get the default video device.
if( ! _device)
{
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
}
// _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
if( _device.isAutoFocusRangeRestrictionSupported )
{
if( [_device lockForConfiguration:&error] )
{
[_device setAutoFocusRangeRestriction:AVCaptureAutoFocusRangeRestrictionNear];
[_device unlockForConfiguration];
}
}
_input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:&error];
if (_input) {
[_session addInput:_input];
} else {
NSLog(#"Error: %#", error);
}
_output = [[AVCaptureMetadataOutput alloc] init];
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[_session addOutput:_output];
// _output.metadataObjectTypes = [_output availableMetadataObjectTypes];
_output.metadataObjectTypes = #[AVMetadataObjectTypePDF417Code ];
_prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
_prevLayer.frame = self.view.bounds;
_prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self updatePreviewLayerForOrientation:[[UIApplication sharedApplication] statusBarOrientation] ];
[self.view.layer addSublayer:_prevLayer];
[_session startRunning];

AVCaptureDevice can't capture back camera

I'm trying to use the back camera off my iphone with AVCaptureDevice. I tried both AVCaptureDevicePositionBack and AVCaptureDevicePositionFront but it still uses the FrontCamera no matter what.
This is my code:
- (void)setupCamera
{
_captureDevice = nil;
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in devices)
{
if (device.position == AVCaptureDevicePositionBack)
{
_captureDevice = device;
break;
}
}
}
- (void)turnCameraOn
{
NSError *error;
_session = [[AVCaptureSession alloc] init];
[_session beginConfiguration];
[_session setSessionPreset:AVCaptureSessionPresetMedium];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:_captureDevice error:&error];
if (input == nil)
NSLog(#"%#", error);
[_session addInput:input];
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
[output setSampleBufferDelegate:self queue:dispatch_queue_create("myQueue", NULL)];
output.videoSettings = #{(id)kCVPixelBufferPixelFormatTypeKey:#(kCVPixelFormatType_32BGRA)};
output.alwaysDiscardsLateVideoFrames = YES;
[_session addOutput:output];
[_session commitConfiguration];
[_session startRunning];
}
- (void)turnCameraOff
{
[_session stopRunning];
_session = nil;
}
Use the following code:
AVCaptureDevicePosition desiredPosition;
if (isUsingFrontFacingCamera)
desiredPosition = AVCaptureDevicePositionBack;
else
desiredPosition = AVCaptureDevicePositionFront;
for (AVCaptureDevice *d in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]) {
if ([d position] == desiredPosition) {
[[captureVideoPreviewLayer session] beginConfiguration];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:d error:nil];
for (AVCaptureInput *oldInput in [[captureVideoPreviewLayer session] inputs]) {
[[captureVideoPreviewLayer session] removeInput:oldInput];
}
[[captureVideoPreviewLayer session] addInput:input];
[[captureVideoPreviewLayer session] commitConfiguration];
break;
}
}

Camera Preview does not fill screen

This is how I am setting up the camera preview in landscape mode in my iPad3
- (void)viewDidAppear:(BOOL)animated
{
AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPreset640x480;
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];
}
In the storyboard, I set the view to fill the entire screen, however it ends up looking like this:
And furthermore, the image is also rotated 90ยบ degrees. How can I change this, so I can make the camera preview fill the entire screen?
Thanks.
Rotate your layer:
switch (self.interfaceOrientation)
{
case UIInterfaceOrientationLandscapeRight:
[captureVideoPreviewLayer setAffineTransform:CGAffineTransformMakeRotation(-M_PI / 2)];
break;
case UIInterfaceOrientationLandscapeLeft:
[captureVideoPreviewLayer setAffineTransform:CGAffineTransformMakeRotation(M_PI / 2)];
break;
}
[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];

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