Functions for managing Worker objects. More...

Functions
VL_SDK_API void VL_CALLINGCONVENTION	vlDelete_Worker (vlWorker_t *worker)
	Deletes a Worker object. More...

VL_SDK_API vlWorker_t *VL_CALLINGCONVENTION	vlNew_SyncWorker ()
	Creates a synchronous Worker object. More...

VL_SDK_API vlWorker_t *VL_CALLINGCONVENTION	vlNew_Worker ()
	Creates a Worker object. More...

VL_SDK_API void VL_CALLINGCONVENTION	vlReleaseBinaryBuffer (const char data[])
	Helper function for releasing a binary memory block. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddCalibratedImageListener (vlWorker_t worker, vlCallbackCalibratedImageWrapper listener, void clientData, vlImageFormat format)
	Registers a listener for CalibratedImage events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddCameraCalibrationDB (vlWorker_t *worker, const char uri[])
	Adds a given URI pointing to a camera calibration database JSON file to the VisionLib. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddDebugImageListener (vlWorker_t worker, vlCallbackImageWrapper listener, void clientData)
	Register a listener for debug image events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddExtrinsicDataListener (vlWorker_t worker, vlCallbackExtrinsicDataWrapper listener, void clientData)
	Registers a listener for ExtrinsicData events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddImageListener (vlWorker_t worker, vlCallbackImageWrapper listener, void clientData)
	Registers a listener for image events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddIntrinsicDataListener (vlWorker_t worker, vlCallbackIntrinsicDataWrapper listener, void clientData)
	Registers a listener for IntrinsicData events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddPerformanceInfoListener (vlWorker_t worker, vlCallbackZString listener, void clientData)
	Registers a listener for performance information events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddTrackingStateListener (vlWorker_t worker, vlCallbackZString listener, void clientData)
	Registers a listener for tracking state events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddWorldFromAnchorTransformListener (vlWorker_t worker, const char anchorName[], vlCallbackSimilarityTransformWrapper listener, void clientData)
	Register a listener for world from anchor transform events (SimilarityTransform events) produced by a certain anchor. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_AddWorldFromCameraTransformListener (vlWorker_t worker, vlCallbackExtrinsicDataWrapper listener, void clientData)
	Registers a listener for world from camera transform events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_ClearListeners (vlWorker_t *worker)
	Removes all listeners. More...

VL_SDK_API char *VL_CALLINGCONVENTION	vlWorker_GetDeviceInfo (vlWorker_t *worker)
	Returns a JSON string with information about the current device. More...

VL_SDK_API vlImageWrapper_t *VL_CALLINGCONVENTION	vlWorker_GetImageByNameSync (vlWorker_t worker, const char image_name)
	Returns a pointer to the camera image with the given name. More...

VL_SDK_API vlImageWrapper_t *VL_CALLINGCONVENTION	vlWorker_GetImageSync (vlWorker_t *worker)
	Returns a pointer to the camera image. More...

VL_SDK_API char *VL_CALLINGCONVENTION	vlWorker_GetLicenseInformation (vlWorker_t *worker)
	Retrieves actual license information as a JSON encoded string. More...

VL_SDK_API vlExtrinsicDataWrapper_t *VL_CALLINGCONVENTION	vlWorker_GetNodeExtrinsicDataSync (vlWorker_t *worker, const char node[], const char key[])
	Returns a pointer to extrinsicdata with the given name from a given node. More...

VL_SDK_API vlImageWrapper_t *VL_CALLINGCONVENTION	vlWorker_GetNodeImageSync (vlWorker_t *worker, const char node[], const char key[])
	Returns a pointer to the image with the given name from a given node. More...

VL_SDK_API vlIntrinsicDataWrapper_t *VL_CALLINGCONVENTION	vlWorker_GetNodeIntrinsicDataSync (vlWorker_t *worker, const char node[], const char key[])
	Returns a pointer to IntrinsicData with the given name from a given node. More...

VL_SDK_API vlSimilarityTransformWrapper_t *VL_CALLINGCONVENTION	vlWorker_GetNodeSimilarityTransformSync (vlWorker_t *worker, const char node[], const char key[])
	Returns a pointer to the SimilarityTransform with the given name from a given node. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_IsRunning (vlWorker_t *worker)
	Returns whether the thread is currently running or not. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_LoadPlugin (vlWorker_t *worker, const char pluginName[])
	Loads the plugin with the given name. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_Lock (vlWorker_t *worker)
	For testing purposed. Don't use!

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_PollEvents (vlWorker_t *worker)
	Calls the registered listeners for the enqueued events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_ProcessCallbacks (vlWorker_t *worker)
	Executes all enqueued callbacks. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_ProcessJsonAndBinaryCommandSync (vlWorker_t worker, const char jsonString[], const char data[], unsigned int size, vlCallbackJsonAndBinaryString callback, void clientData)
	Processes the passed json command along with binary data for the visionLib. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_ProcessJsonCommandSync (vlWorker_t worker, const char jsonString[], vlCallbackJsonString callback, void clientData)
	Processes the passed command. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_PushJsonAndBinaryCommand (vlWorker_t worker, const char jsonString[], const char data[], unsigned int size, vlCallbackJsonAndBinaryString callback, void clientData)
	Enqueues a json command along with binary data for the visionLib. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_PushJsonCommand (vlWorker_t worker, const char jsonString[], vlCallbackJsonString callback, void clientData)
	Enqueues a command for the tracking thread as zero terminated JSON string. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemoveCalibratedImageListener (vlWorker_t worker, vlCallbackCalibratedImageWrapper listener, void clientData, vlImageFormat format)
	Unregisters a listener from CalibratedImage events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemoveDebugImageListener (vlWorker_t worker, vlCallbackImageWrapper listener, void clientData)
	Unregisters a listener from debug image events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemoveExtrinsicDataListener (vlWorker_t worker, vlCallbackExtrinsicDataWrapper listener, void clientData)
	Unregisters a listener from ExtrinsicData events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemoveImageListener (vlWorker_t worker, vlCallbackImageWrapper listener, void clientData)
	Unregisters a listener from image events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemoveIntrinsicDataListener (vlWorker_t worker, vlCallbackIntrinsicDataWrapper listener, void clientData)
	Unregisters a listener from IntrinsicData events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemovePerformanceInfoListener (vlWorker_t worker, vlCallbackZString listener, void clientData)
	Unregisters a listener from performance info events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemoveTrackingStateListener (vlWorker_t worker, vlCallbackZString listener, void clientData)
	Unregisters a listener from tracking state events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemoveWorldFromAnchorTransformListener (vlWorker_t worker, const char anchorName[], vlCallbackSimilarityTransformWrapper listener, void clientData)
	Unregister a listener from world from anchor transform events (SimilarityTransform events) produced by a certain anchor. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RemoveWorldFromCameraTransformListener (vlWorker_t worker, vlCallbackExtrinsicDataWrapper listener, void clientData)
	Unregisters a listener from world from camera transform events. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_ResetCameraCalibrationDB (vlWorker_t *worker)
	Removes all references to all manually set calibration data bases. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_RunOnceSync (vlWorker_t *worker)
	Processes the enqueued commands and the tracking once. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_SetLicenseFileData (vlWorker_t *worker, const char licenseFileData[])
	Allows to inject the license data from memory. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_SetLicenseFilePath (vlWorker_t *worker, const char licenseFilePath[])
	Sets the path of the license file. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_SetNodeExtrinsicDataSync (vlWorker_t worker, vlExtrinsicDataWrapper_t extrinsicData, const char node[], const char key[])
	Sets the given extrinsicData in the given input of the given node. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_SetNodeImageSync (vlWorker_t worker, vlImageWrapper_t image, const char node[], const char key[])
	Sets the given image in the given input of the given node. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_SetNodeIntrinsicDataSync (vlWorker_t worker, vlIntrinsicDataWrapper_t intrinsicData, const char node[], const char key[])
	Sets the given IntrinsicData in the given input of the given node. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_SetNodeSimilarityTransformSync (vlWorker_t worker, vlSimilarityTransformWrapper_t similarityTransform, const char node[], const char key[])
	Sets the given SimilarityTransform in the given input of the given node. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_Start (vlWorker_t *worker)
	Starts the tracking thread. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_Stop (vlWorker_t *worker)
	Stops the tracking thread. More...

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_Unlock (vlWorker_t *worker)
	For testing purposed. Don't use!

VL_SDK_API bool VL_CALLINGCONVENTION	vlWorker_WaitEvents (vlWorker_t *worker, unsigned int timeout)
	Waits for enqueued events and calls the registered listeners. More...

Detailed Description

Functions for managing Worker objects.

A Worker object controls the tracking thread.

Function Documentation

◆ vlDelete_Worker()

VL_SDK_API void VL_CALLINGCONVENTION vlDelete_Worker ( vlWorker_t * worker )

Deletes a Worker object.

Parameters

worker Pointer to a Worker object.

◆ vlNew_SyncWorker()

VL_SDK_API vlWorker_t* VL_CALLINGCONVENTION vlNew_SyncWorker ( )

Creates a synchronous Worker object.

A synchronous Worker object doesn't create a new thread. Instead one has to explicitly tell the Worker when to do his work by calling the vlWorker_RunOnceSync function. This has the advantage, that we know exactly when the tracking is running, when it's finished and when we can get the results.

Use vlDelete_Worker after usage to avoid memory leaks.

Returns: Pointer to a synchronous Worker object. Use vlDelete_Worker after usage to avoid memory leaks.

◆ vlNew_Worker()

VL_SDK_API vlWorker_t* VL_CALLINGCONVENTION vlNew_Worker ( )

Creates a Worker object.

Use vlDelete_Worker after usage to avoid memory leaks.

Returns: Pointer to an Worker object. Use vlDelete_Worker after usage to avoid memory leaks.

◆ vlReleaseBinaryBuffer()

VL_SDK_API void VL_CALLINGCONVENTION vlReleaseBinaryBuffer ( const char data[] )

Helper function for releasing a binary memory block.

When an vlCallbackJsonAndBinaryString is issued, a memory block passed should be removed after using.

Currently this command is used internally and will be documented in future versions. Thus it is considered as BETA!

Parameters

data	Pointer to a binary object.

◆ vlWorker_AddCalibratedImageListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddCalibratedImageListener	(	vlWorker_t *	worker,
		vlCallbackCalibratedImageWrapper	listener,
		void *	clientData,
		vlImageFormat	format
	)

Registers a listener for CalibratedImage events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which will be notified during the event processing, if an CalibratedImage event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.
format	The image format for which the listener function should receive events.

Returns: true, on success; false otherwise.

◆ vlWorker_AddCameraCalibrationDB()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddCameraCalibrationDB	(	vlWorker_t *	worker,
		const char	uri[]
	)

Adds a given URI pointing to a camera calibration database JSON file to the VisionLib.

The VisionLib loads the added camera calibration database file before loading a new tracking configuration file.

This allows to provide a custom camera calibrations for devices for which the VisionLib doesn't provide a default calibration. If a default calibration with the same name already exists, then the default calibration will get overwritten with the custom calibration.

Please also have a look at this reference for more information about the camera calibration database format.

Parameters

worker	Pointer to an Worker object.
uri	Zero terminated string with an URI pointing to the camera calibration database file.

Returns: true, on success; false otherwise.

◆ vlWorker_AddDebugImageListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddDebugImageListener	(	vlWorker_t *	worker,
		vlCallbackImageWrapper	listener,
		void *	clientData
	)

Register a listener for debug image events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which will be notified during the event processing, if a debug image event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_AddExtrinsicDataListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddExtrinsicDataListener	(	vlWorker_t *	worker,
		vlCallbackExtrinsicDataWrapper	listener,
		void *	clientData
	)

Registers a listener for ExtrinsicData events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which will be notified during the event processing, if an ExtrinsicData event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_AddImageListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddImageListener	(	vlWorker_t *	worker,
		vlCallbackImageWrapper	listener,
		void *	clientData
	)

Registers a listener for image events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which will be notified during the event processing, if an image event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_AddIntrinsicDataListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddIntrinsicDataListener	(	vlWorker_t *	worker,
		vlCallbackIntrinsicDataWrapper	listener,
		void *	clientData
	)

Registers a listener for IntrinsicData events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which will be notified during the event processing, if an IntrinsicData event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_AddPerformanceInfoListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddPerformanceInfoListener	(	vlWorker_t *	worker,
		vlCallbackZString	listener,
		void *	clientData
	)

Registers a listener for performance information events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which will be notified during the event processing, if a performance information event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_AddTrackingStateListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddTrackingStateListener	(	vlWorker_t *	worker,
		vlCallbackZString	listener,
		void *	clientData
	)

Registers a listener for tracking state events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which will be notified during the event processing, if a tracking state event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_AddWorldFromAnchorTransformListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddWorldFromAnchorTransformListener	(	vlWorker_t *	worker,
		const char	anchorName[],
		vlCallbackSimilarityTransformWrapper	listener,
		void *	clientData
	)

Register a listener for world from anchor transform events (SimilarityTransform events) produced by a certain anchor.

Parameters

worker	Pointer to a Worker object.
anchorName	Name of the anchor to be addressed.
listener	Listener function which will be notified during the event processing, if an event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_AddWorldFromCameraTransformListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_AddWorldFromCameraTransformListener	(	vlWorker_t *	worker,
		vlCallbackExtrinsicDataWrapper	listener,
		void *	clientData
	)

Registers a listener for world from camera transform events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which will be notified during the event processing, if an world from camera transform event occurred.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_ClearListeners()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_ClearListeners ( vlWorker_t * worker )

Removes all listeners.

Parameters

worker Pointer to a Worker object.

Returns: true, on success; false otherwise.

◆ vlWorker_GetDeviceInfo()

VL_SDK_API char* VL_CALLINGCONVENTION vlWorker_GetDeviceInfo ( vlWorker_t * worker )

Returns a JSON string with information about the current device.

It also contains information about the cameras currently connected to the system.

A typical device info might look like this:

{
    "appID": "com.unity3d.UnityEditor5.x",
    "availableCameras": [{
        "cameraName": "HD Webcam C525",
        "deviceID": "HDWebcamC525",
        "internalID": "0x400000046d0826",
        "position": "unknown",
        "prefRes": "640x480"
    }],
    "cameraAllowed": false,
    "currentDisplayOrientation": 0,
    "hasWebServer": false,
    "internalModelID": "x86_64",
    "manufacture": "Apple",
    "model": "Mac",
    "modelVersion": "Mac",
    "nativeResX": 242,
    "nativeResY": 0,
    "numberOfProcessors": 1,
    "os": "macOS",
    "unifiedID": "1467016391MY190",
    "usingEventLogger": false,
    "webServerURL": ""
}

Parameters

worker Pointer to an vlWorker object.

Returns: A char* containing the current device information which MUST be freed using vlReleaseBinaryBuffer().

◆ vlWorker_GetImageByNameSync()

VL_SDK_API vlImageWrapper_t* VL_CALLINGCONVENTION vlWorker_GetImageByNameSync	(	vlWorker_t *	worker,
		const char *	image_name
	)

Returns a pointer to the camera image with the given name.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

The worker is the owner of the image. Therefore you should not call vlDelete_ImageWrapper with the returned image as parameter.

NOTICE: This functions is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
image_name	name of the image to get

Returns: A pointer to an ImageWrapper object, on success; NULL otherwise.

◆ vlWorker_GetImageSync()

VL_SDK_API vlImageWrapper_t* VL_CALLINGCONVENTION vlWorker_GetImageSync ( vlWorker_t * worker )

Returns a pointer to the camera image.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

The worker is the owner of the image. Therefore you should not call vlDelete_ImageWrapper with the returned image as parameter.

NOTICE: This functions is experimental and might get removed in future.

Parameters

worker Pointer to a Worker object.

Returns: A pointer to an ImageWrapper object, on success; NULL otherwise.

◆ vlWorker_GetLicenseInformation()

VL_SDK_API char* VL_CALLINGCONVENTION vlWorker_GetLicenseInformation ( vlWorker_t * worker )

Retrieves actual license information as a JSON encoded string.

The string is JSON encoded and can be used for examining available license features. It can only be valid after a license file has been set.

Parameters

worker Pointer to a Worker object.

Returns: A char* containing the current license information which MUST be freed using vlReleaseBinaryBuffer().

◆ vlWorker_GetNodeExtrinsicDataSync()

VL_SDK_API vlExtrinsicDataWrapper_t* VL_CALLINGCONVENTION vlWorker_GetNodeExtrinsicDataSync	(	vlWorker_t *	worker,
		const char	node[],
		const char	key[]
	)

Returns a pointer to extrinsicdata with the given name from a given node.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

The returned ExtrinsicData has to be freed using vlDelete_ExtrinsicDataWrapper.

NOTICE: This function is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
node	The name of the node.
key	The name of the exposed ExtrinsicData.

Returns: A pointer to an ExtrinsicDataWrapper object, on success; NULL otherwise.

◆ vlWorker_GetNodeImageSync()

VL_SDK_API vlImageWrapper_t* VL_CALLINGCONVENTION vlWorker_GetNodeImageSync	(	vlWorker_t *	worker,
		const char	node[],
		const char	key[]
	)

Returns a pointer to the image with the given name from a given node.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

The returned image has to be freed using vlDelete_ImageWrapper.

NOTICE: This functions is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
node	name of the node
key	Name of the exposed image

Returns: A pointer to an ImageWrapper object, on success; NULL otherwise.

◆ vlWorker_GetNodeIntrinsicDataSync()

VL_SDK_API vlIntrinsicDataWrapper_t* VL_CALLINGCONVENTION vlWorker_GetNodeIntrinsicDataSync	(	vlWorker_t *	worker,
		const char	node[],
		const char	key[]
	)

Returns a pointer to IntrinsicData with the given name from a given node.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

The returned IntrinsicData has to be freed using vlDelete_IntrinsicDataWrapper

NOTICE: This function is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
node	The name of the node.
key	The name of the exposed IntrinsicData.

Returns: A pointer to an IntrinsicData object, on success; NULL otherwise.

◆ vlWorker_GetNodeSimilarityTransformSync()

VL_SDK_API vlSimilarityTransformWrapper_t* VL_CALLINGCONVENTION vlWorker_GetNodeSimilarityTransformSync	(	vlWorker_t *	worker,
		const char	node[],
		const char	key[]
	)

Returns a pointer to the SimilarityTransform with the given name from a given node.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

The returned SimilarityTransform has to be freed using vlDelete_SimilarityTransformWrapper.

NOTICE: This function is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
node	The name of the node.
key	The name of the exposed SimilarityTransform.

Returns: A pointer to a SimilarityTransformWrapper object, on success; NULL otherwise.

◆ vlWorker_IsRunning()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_IsRunning ( vlWorker_t * worker )

Returns whether the thread is currently running or not.

Parameters

worker Pointer to a Worker object.

Returns: true, if the thread is running; false otherwise.

◆ vlWorker_LoadPlugin()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_LoadPlugin	(	vlWorker_t *	worker,
		const char	pluginName[]
	)

Loads the plugin with the given name.

Parameters

worker	Pointer to a Worker object.
pluginName	Zero terminated string with the name of the plugin without prefix ("VP") and fileending (".dll", ".so") e.g. "VideoUEye".

Returns: true, if plugin has been loaded successfully; false otherwise.

◆ vlWorker_PollEvents()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_PollEvents ( vlWorker_t * worker )

Calls the registered listeners for the enqueued events.

Listeners aren't called immediately from the tracking thread in order to avoid synchronisation problems. Instead this method should be called regularly from the main thread.

Parameters

worker Pointer to a Worker object.

Returns: true, on success; false otherwise.

◆ vlWorker_ProcessCallbacks()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_ProcessCallbacks ( vlWorker_t * worker )

Executes all enqueued callbacks.

Callbacks aren't called immediately from the tracking thread in order to avoid synchronisation problems. Instead this method should be called regularly from the main thread.

Parameters

worker Pointer to a Worker object.

Returns: true, on success; false otherwise.

◆ vlWorker_ProcessJsonAndBinaryCommandSync()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_ProcessJsonAndBinaryCommandSync	(	vlWorker_t *	worker,
		const char	jsonString[],
		const char	data[],
		unsigned int	size,
		vlCallbackJsonAndBinaryString	callback,
		void *	clientData
	)

Processes the passed json command along with binary data for the visionLib.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

Currently this command is used internally and will be documented in future versions. Thus it is considered as BETA!

Parameters

worker	Pointer to a Worker object.
jsonString	Command as zero terminated JSON string.
data	Binary data pointer. The lifetime of the memory should be maintaned until the answer has been received. (might be 0)
size	The size of the content passed.
callback	Callback function, which will be called synchronously
clientData	The callback function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, if the command is supported; false, otherwise.

◆ vlWorker_ProcessJsonCommandSync()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_ProcessJsonCommandSync	(	vlWorker_t *	worker,
		const char	jsonString[],
		vlCallbackJsonString	callback,
		void *	clientData
	)

Processes the passed command.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

Parameters

worker	Pointer to a Worker object.
jsonString	Command as zero terminated JSON string.
callback	Callback function, which will be called after the command was processed.
clientData	The callback function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, if the command is supported; false, otherwise.

◆ vlWorker_PushJsonAndBinaryCommand()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_PushJsonAndBinaryCommand	(	vlWorker_t *	worker,
		const char	jsonString[],
		const char	data[],
		unsigned int	size,
		vlCallbackJsonAndBinaryString	callback,
		void *	clientData
	)

Enqueues a json command along with binary data for the visionLib.

The command gets processed asynchronously by the tracking thread and a callback will called once after the processing has finished.

Currently this command is used internally and will be documented in future versions. Thus it is considered as BETA!

A list of the available commands can be found under https://docs.visionlib.com/v2.1.0/tracker-commands.html

Parameters

worker	Pointer to a Worker object.
jsonString	Command as zero terminated JSON string.
data	Binary data pointer. The lifetime of the memory should be maintaned until the answer has been received. (might be 0)
size	The size of the content passed.
callback	Callback function, which will be called inside vlWorker_ProcessCallbacks after the command was processed.
clientData	The callback function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, if the command was enqueue successfully; false otherwise.

◆ vlWorker_PushJsonCommand()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_PushJsonCommand	(	vlWorker_t *	worker,
		const char	jsonString[],
		vlCallbackJsonString	callback,
		void *	clientData
	)

Enqueues a command for the tracking thread as zero terminated JSON string.

The command gets processed asynchronously by the tracking thread and a callback will called once after the processing has finished.

A list of the available commands can be found under https://docs.visionlib.com/v2.1.0/tracker-commands.html

Parameters

worker	Pointer to a Worker object.
jsonString	Command as zero terminated JSON string.
callback	Callback function, which will be called inside vlWorker_ProcessCallbacks after the command was processed.
clientData	The callback function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, if the command was enqueue successfully; false otherwise.

◆ vlWorker_RemoveCalibratedImageListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemoveCalibratedImageListener	(	vlWorker_t *	worker,
		vlCallbackCalibratedImageWrapper	listener,
		void *	clientData,
		vlImageFormat	format
	)

Unregisters a listener from CalibratedImage events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which should be unregistered.
clientData	Pointer value used as parameter during the registration of the listener.
format	The image format for which the listener function has been registered.

Returns: true, on success; false otherwise.

◆ vlWorker_RemoveDebugImageListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemoveDebugImageListener	(	vlWorker_t *	worker,
		vlCallbackImageWrapper	listener,
		void *	clientData
	)

Unregisters a listener from debug image events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which should be unregistered.
clientData	Pointer value used as parameter during the registration of the listener.

Returns: true, on success; false otherwise.

◆ vlWorker_RemoveExtrinsicDataListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemoveExtrinsicDataListener	(	vlWorker_t *	worker,
		vlCallbackExtrinsicDataWrapper	listener,
		void *	clientData
	)

Unregisters a listener from ExtrinsicData events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which should be unregistered.
clientData	Pointer value used as parameter during the registration of the listener.

Returns: true, on success; false otherwise.

◆ vlWorker_RemoveImageListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemoveImageListener	(	vlWorker_t *	worker,
		vlCallbackImageWrapper	listener,
		void *	clientData
	)

Unregisters a listener from image events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which should be unregistered.
clientData	Pointer value used as parameter during the registration of the listener.

Returns: true, on success; false otherwise.

◆ vlWorker_RemoveIntrinsicDataListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemoveIntrinsicDataListener	(	vlWorker_t *	worker,
		vlCallbackIntrinsicDataWrapper	listener,
		void *	clientData
	)

Unregisters a listener from IntrinsicData events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which should be unregistered.
clientData	Pointer value used as parameter during the registration of the listener.

Returns: true, on success; false otherwise.

◆ vlWorker_RemovePerformanceInfoListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemovePerformanceInfoListener	(	vlWorker_t *	worker,
		vlCallbackZString	listener,
		void *	clientData
	)

Unregisters a listener from performance info events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which should be unregistered.
clientData	Pointer value used as parameter during the registration of the listener.

Returns: true, on success; false otherwise.

◆ vlWorker_RemoveTrackingStateListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemoveTrackingStateListener	(	vlWorker_t *	worker,
		vlCallbackZString	listener,
		void *	clientData
	)

Unregisters a listener from tracking state events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which should be unregistered.
clientData	Pointer value used as parameter during the registration of the listener.

Returns: true, on success; false otherwise.

◆ vlWorker_RemoveWorldFromAnchorTransformListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemoveWorldFromAnchorTransformListener	(	vlWorker_t *	worker,
		const char	anchorName[],
		vlCallbackSimilarityTransformWrapper	listener,
		void *	clientData
	)

Unregister a listener from world from anchor transform events (SimilarityTransform events) produced by a certain anchor.

Parameters

worker	Pointer to a Worker object.
anchorName	Name of the anchor to be addressed.
listener	Listener function which should be unregistered.
clientData	The listener function will be called with the given pointer value as parameter. This can be used to invoke a member function.

Returns: true, on success; false otherwise.

◆ vlWorker_RemoveWorldFromCameraTransformListener()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RemoveWorldFromCameraTransformListener	(	vlWorker_t *	worker,
		vlCallbackExtrinsicDataWrapper	listener,
		void *	clientData
	)

Unregisters a listener from world from camera transform events.

Parameters

worker	Pointer to a Worker object.
listener	Listener function which should be unregistered.
clientData	Pointer value used as parameter during the registration of the listener.

Returns: true, on success; false otherwise.

◆ vlWorker_ResetCameraCalibrationDB()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_ResetCameraCalibrationDB ( vlWorker_t * worker )

Removes all references to all manually set calibration data bases.

The VisionLib loads the added camera calibration database file before loading a new tracking configuration file. This command removes the queue of file to be loaded.

This allows to provide a custom camera calibrations for devices for which the VisionLib doesn't provide a default calibration. If a default calibration with the same name already exists, then the default calibration will get overwritten with the custom calibration.

Please also have a look at this reference for more information about the camera calibration database format.

Parameters

worker Pointer to an Worker object.

Returns: true, on success; false otherwise.

◆ vlWorker_RunOnceSync()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_RunOnceSync ( vlWorker_t * worker )

Processes the enqueued commands and the tracking once.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker). The target number of FPS will get ignored. After calling this function you should call vlWorker_ProcessEvents and vlWorker_PollEvents to invoke callbacks and registered listeners.

Parameters

worker Pointer to a Worker object.

Returns: true, on success; false, otherwise.

◆ vlWorker_SetLicenseFileData()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_SetLicenseFileData	(	vlWorker_t *	worker,
		const char	licenseFileData[]
	)

Allows to inject the license data from memory.

This is mandatory for being able to run the tracking. Alternatively you can load the license data from a file using the vlWorker_SetLicenseFilePath function. If the vlWorker_SetLicenseFilePath was previously used and now the license data should be read from a file, then please set the license file data to an empty string first.

Parameters

worker	Pointer to a Worker object.
licenseFileData	Zero terminated string with the license data.

Returns: true, on success; false otherwise.

◆ vlWorker_SetLicenseFilePath()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_SetLicenseFilePath	(	vlWorker_t *	worker,
		const char	licenseFilePath[]
	)

Sets the path of the license file.

This is mandatory for being able to run the tracking. Alternatively you can inject the license file from memory using the vlWorker_SetLicenseFileData function.

Parameters

worker	Pointer to a Worker object.
licenseFilePath	Zero terminated string with a path to the license file.

Returns: true, on success; false otherwise.

◆ vlWorker_SetNodeExtrinsicDataSync()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_SetNodeExtrinsicDataSync	(	vlWorker_t *	worker,
		vlExtrinsicDataWrapper_t *	extrinsicData,
		const char	node[],
		const char	key[]
	)

Sets the given extrinsicData in the given input of the given node.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

NOTICE: This function is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
extrinsicData	Pointer to an ExtrinsicData object.
node	The name of the node.
key	The name of the ExtrinsicData to set.

Returns: true, on success; false, otherwise.

◆ vlWorker_SetNodeImageSync()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_SetNodeImageSync	(	vlWorker_t *	worker,
		vlImageWrapper_t *	image,
		const char	node[],
		const char	key[]
	)

Sets the given image in the given input of the given node.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

NOTICE: This function is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
image	Pointer to an Image object
node	name of the node
key	Name of the image to set

Returns: true, on success; false, otherwise.

◆ vlWorker_SetNodeIntrinsicDataSync()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_SetNodeIntrinsicDataSync	(	vlWorker_t *	worker,
		vlIntrinsicDataWrapper_t *	intrinsicData,
		const char	node[],
		const char	key[]
	)

Sets the given IntrinsicData in the given input of the given node.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

NOTICE: This function is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
intrinsicData	Pointer to an IntrinsicData object
node	The name of the node.
key	The name of the IntrinsicData to set.

Returns: true, on success; false, otherwise.

◆ vlWorker_SetNodeSimilarityTransformSync()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_SetNodeSimilarityTransformSync	(	vlWorker_t *	worker,
		vlSimilarityTransformWrapper_t *	similarityTransform,
		const char	node[],
		const char	key[]
	)

Sets the given SimilarityTransform in the given input of the given node.

This function only works, if the Worker was created as synchronous instance (vlNew_SyncWorker).

NOTICE: This function is experimental and might get removed in future.

Parameters

worker	Pointer to a Worker object.
similarityTransform	Pointer to a SimilarityTransform object.
node	The name of the node.
key	The name of the SimilarityTransform to set.

Returns: true, on success; false, otherwise.

◆ vlWorker_Start()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_Start ( vlWorker_t * worker )

Starts the tracking thread.

Parameters

worker Pointer to a Worker object.

Returns: true, on success; false otherwise.

◆ vlWorker_Stop()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_Stop ( vlWorker_t * worker )

Stops the tracking thread.

Parameters

worker Pointer to a Worker object.

Returns: true, on success; false otherwise.

◆ vlWorker_WaitEvents()

VL_SDK_API bool VL_CALLINGCONVENTION vlWorker_WaitEvents	(	vlWorker_t *	worker,
		unsigned int	timeout
	)

Waits for enqueued events and calls the registered listeners.

Listeners aren't called immediately from the tracking thread in order to avoid synchronisation problems. Instead this method should be called regularly from the main thread.

Parameters

worker	Pointer to a Worker object.
timeout	Number of milliseconds before stopping to wait. Under normal circumstances this shouldn't happen, but in case something went wrong, we don't want to wait indefinitely.

Returns: true, on success or false, if there was an error while waiting for events. false is also returned, if the tracking is enabled, but timeout elapsed without an event arriving.

documentation

Functions

Detailed Description

Function Documentation

◆ vlDelete_Worker()

◆ vlNew_SyncWorker()

◆ vlNew_Worker()

◆ vlReleaseBinaryBuffer()

◆ vlWorker_AddCalibratedImageListener()

◆ vlWorker_AddCameraCalibrationDB()

◆ vlWorker_AddDebugImageListener()

◆ vlWorker_AddExtrinsicDataListener()

◆ vlWorker_AddImageListener()

◆ vlWorker_AddIntrinsicDataListener()

◆ vlWorker_AddPerformanceInfoListener()

◆ vlWorker_AddTrackingStateListener()

◆ vlWorker_AddWorldFromAnchorTransformListener()

◆ vlWorker_AddWorldFromCameraTransformListener()

◆ vlWorker_ClearListeners()

◆ vlWorker_GetDeviceInfo()

◆ vlWorker_GetImageByNameSync()

◆ vlWorker_GetImageSync()

◆ vlWorker_GetLicenseInformation()

◆ vlWorker_GetNodeExtrinsicDataSync()

◆ vlWorker_GetNodeImageSync()

◆ vlWorker_GetNodeIntrinsicDataSync()

◆ vlWorker_GetNodeSimilarityTransformSync()

◆ vlWorker_IsRunning()

◆ vlWorker_LoadPlugin()

◆ vlWorker_PollEvents()

◆ vlWorker_ProcessCallbacks()

◆ vlWorker_ProcessJsonAndBinaryCommandSync()

◆ vlWorker_ProcessJsonCommandSync()

◆ vlWorker_PushJsonAndBinaryCommand()

◆ vlWorker_PushJsonCommand()

◆ vlWorker_RemoveCalibratedImageListener()

◆ vlWorker_RemoveDebugImageListener()

◆ vlWorker_RemoveExtrinsicDataListener()

◆ vlWorker_RemoveImageListener()

◆ vlWorker_RemoveIntrinsicDataListener()

◆ vlWorker_RemovePerformanceInfoListener()

◆ vlWorker_RemoveTrackingStateListener()

◆ vlWorker_RemoveWorldFromAnchorTransformListener()

◆ vlWorker_RemoveWorldFromCameraTransformListener()

◆ vlWorker_ResetCameraCalibrationDB()

◆ vlWorker_RunOnceSync()

◆ vlWorker_SetLicenseFileData()

◆ vlWorker_SetLicenseFilePath()

◆ vlWorker_SetNodeExtrinsicDataSync()

◆ vlWorker_SetNodeImageSync()

◆ vlWorker_SetNodeIntrinsicDataSync()

◆ vlWorker_SetNodeSimilarityTransformSync()

◆ vlWorker_Start()

◆ vlWorker_Stop()

◆ vlWorker_WaitEvents()