Package apple.avfoundation

Class AVCaptureMetadataOutput

  • All Implemented Interfaces:
    NSObject
    public class AVCaptureMetadataOutput
extends AVCaptureOutput
    AVCaptureMetadataOutput AVCaptureMetadataOutput is a concrete subclass of AVCaptureOutput that can be used to process metadata objects from an attached connection. Instances of AVCaptureMetadataOutput emit arrays of AVMetadataObject instances (see AVMetadataObject.h), such as detected faces. Applications can access the metadata objects with the captureOutput:didOutputMetadataObjects:fromConnection: delegate method.

    • Constructor Detail

      • AVCaptureMetadataOutput

        protected AVCaptureMetadataOutput​(org.moe.natj.general.Pointer peer)

    • Method Detail

      • accessInstanceVariablesDirectly

        public static boolean accessInstanceVariablesDirectly()

      • allocWithZone

        public static java.lang.Object allocWithZone​(org.moe.natj.general.ptr.VoidPtr zone)

      • automaticallyNotifiesObserversForKey

        public static boolean automaticallyNotifiesObserversForKey​(java.lang.String key)

      • cancelPreviousPerformRequestsWithTarget

        public static void cancelPreviousPerformRequestsWithTarget​(java.lang.Object aTarget)

      • cancelPreviousPerformRequestsWithTargetSelectorObject

        public static void cancelPreviousPerformRequestsWithTargetSelectorObject​(java.lang.Object aTarget,
                                                                         org.moe.natj.objc.SEL aSelector,
                                                                         java.lang.Object anArgument)

      • classFallbacksForKeyedArchiver

        public static NSArray<java.lang.String> classFallbacksForKeyedArchiver()

      • classForKeyedUnarchiver

        public static org.moe.natj.objc.Class classForKeyedUnarchiver()

      • debugDescription_static

        public static java.lang.String debugDescription_static()

      • description_static

        public static java.lang.String description_static()

      • hash_static

        public static long hash_static()

      • instanceMethodSignatureForSelector

        public static NSMethodSignature instanceMethodSignatureForSelector​(org.moe.natj.objc.SEL aSelector)

      • instancesRespondToSelector

        public static boolean instancesRespondToSelector​(org.moe.natj.objc.SEL aSelector)

      • isSubclassOfClass

        public static boolean isSubclassOfClass​(org.moe.natj.objc.Class aClass)

      • keyPathsForValuesAffectingValueForKey

        public static NSSet<java.lang.String> keyPathsForValuesAffectingValueForKey​(java.lang.String key)

      • new_objc

        public static java.lang.Object new_objc()

      • resolveClassMethod

        public static boolean resolveClassMethod​(org.moe.natj.objc.SEL sel)

      • resolveInstanceMethod

        public static boolean resolveInstanceMethod​(org.moe.natj.objc.SEL sel)

      • setVersion_static

        public static void setVersion_static​(long aVersion)

      • superclass_static

        public static org.moe.natj.objc.Class superclass_static()

      • version_static

        public static long version_static()

      • availableMetadataObjectTypes

        public NSArray<java.lang.String> availableMetadataObjectTypes()
        [@property] availableMetadataObjectTypes Indicates the receiver's supported metadata object types. The value of this property is an NSArray of NSStrings corresponding to AVMetadataObjectType strings defined in AVMetadataObject.h -- one for each metadata object type supported by the receiver. Available metadata object types are dependent on the capabilities of the AVCaptureInputPort to which this receiver's AVCaptureConnection is connected. Clients may specify the types of objects they would like to process by calling setMetadataObjectTypes:. This property is key-value observable.

      • metadataObjectTypes

        public NSArray<java.lang.String> metadataObjectTypes()
        [@property] metadataObjectTypes Specifies the types of metadata objects that the receiver should present to the client. AVCaptureMetadataOutput may detect and emit multiple metadata object types. For apps linked before iOS 7.0, the receiver defaults to capturing face metadata objects if supported (see -availableMetadataObjectTypes). For apps linked on or after iOS 7.0, the receiver captures no metadata objects by default. -setMetadataObjectTypes: throws an NSInvalidArgumentException if any elements in the array are not present in the -availableMetadataObjectTypes array.

      • metadataObjectsCallbackQueue

        public NSObject metadataObjectsCallbackQueue()
        [@property] metadataObjectsCallbackQueue The dispatch queue on which all metadata object delegate methods will be called. The value of this property is a dispatch_queue_t. The queue is set using the setMetadataObjectsDelegate:queue: method.

      • metadataObjectsDelegate

        public AVCaptureMetadataOutputObjectsDelegate metadataObjectsDelegate()
        [@property] metadataObjectsDelegate The receiver's delegate. The value of this property is an object conforming to the AVCaptureMetadataOutputObjectsDelegate protocol that will receive metadata objects after they are captured. The delegate is set using the setMetadataObjectsDelegate:queue: method.

      • rectOfInterest

        public CGRect rectOfInterest()
        [@property] rectOfInterest Specifies a rectangle of interest for limiting the search area for visual metadata. The value of this property is a CGRect that determines the receiver's rectangle of interest for each frame of video. The rectangle's origin is top left and is relative to the coordinate space of the device providing the metadata. Specifying a rectOfInterest may improve detection performance for certain types of metadata. The default value of this property is the value CGRectMake(0, 0, 1, 1). Metadata objects whose bounds do not intersect with the rectOfInterest will not be returned. As of iOS 13, this property can be set without requiring a lengthy rebuild of the session in which video preview is disrupted.

      • setMetadataObjectTypes

        public void setMetadataObjectTypes​(NSArray<java.lang.String> value)
        [@property] metadataObjectTypes Specifies the types of metadata objects that the receiver should present to the client. AVCaptureMetadataOutput may detect and emit multiple metadata object types. For apps linked before iOS 7.0, the receiver defaults to capturing face metadata objects if supported (see -availableMetadataObjectTypes). For apps linked on or after iOS 7.0, the receiver captures no metadata objects by default. -setMetadataObjectTypes: throws an NSInvalidArgumentException if any elements in the array are not present in the -availableMetadataObjectTypes array.

      • setMetadataObjectsDelegateQueue

        public void setMetadataObjectsDelegateQueue​(AVCaptureMetadataOutputObjectsDelegate objectsDelegate,
                                            NSObject objectsCallbackQueue)
        setMetadataObjectsDelegate:queue: Sets the receiver's delegate that will accept metadata objects and dispatch queue on which the delegate will be called. When new metadata objects are captured in the receiver's connection, they will be vended to the delegate using the captureOutput:didOutputMetadataObjects:fromConnection: delegate method. All delegate methods will be called on the specified dispatch queue. Clients that need to minimize the chances of metadata being dropped should specify a queue on which a sufficiently small amount of processing is performed along with receiving metadata objects. A serial dispatch queue must be used to guarantee that metadata objects will be delivered in order. The objectsCallbackQueue parameter may not be NULL, except when setting the objectsDelegate to nil.
        Parameters:
        objectsDelegate - An object conforming to the AVCaptureMetadataOutputObjectsDelegate protocol that will receive metadata objects after they are captured.
        objectsCallbackQueue - A dispatch queue on which all delegate methods will be called.

      • setRectOfInterest

        public void setRectOfInterest​(CGRect value)
        [@property] rectOfInterest Specifies a rectangle of interest for limiting the search area for visual metadata. The value of this property is a CGRect that determines the receiver's rectangle of interest for each frame of video. The rectangle's origin is top left and is relative to the coordinate space of the device providing the metadata. Specifying a rectOfInterest may improve detection performance for certain types of metadata. The default value of this property is the value CGRectMake(0, 0, 1, 1). Metadata objects whose bounds do not intersect with the rectOfInterest will not be returned. As of iOS 13, this property can be set without requiring a lengthy rebuild of the session in which video preview is disrupted.