ExternalImageStreamFrameSource Class¶

Description¶

A external frame source which only accept image stream input.

This frame source is not a motion tracking device, and will not output motion data in a ARSession .

You can inherent it to implenment custom camera which has image input only. It cannot be used for HMD input. You need to get image and input into EasyAR by yourself from hardware other places like usb connected camera on Android. EasyAR does not provide the capability to grab data from those devices, it does provide the capability to run EasyAR features after you put data into EasyAR.

EasyAR Sense will stop responding after a fixed and limited time per run if trial product (personal license, trial XR license, or trial Mega services, etc.) is being used with custom camera or HMD.

MonoBehaviour Messages¶

protected virtual void Awake()

protected virtual void OnApplicationPause(bool pause)

protected virtual void OnDestroy()

Properties¶

ReceivedFrameCount¶

C#: public int ReceivedFrameCount { get; }

Received frame count. Usually used for debug. There are usually hardware issues if this value stop to increase, and re-plug may help when using some devices like Nreal.

Camera¶

C#: internal protected virtual abstract Camera Camera { }

Provide only when creating a new frame source. It will only be accessed during ARSession.Assemble .

On desktop or mobile phones, it represents the Camera in the virtual world in reflection of real world camera device, its projection matrix and transform will be set to reflect the real world camera, and it is controlled by EasyAR. On head mounted displays, it is only used to display some diagnostics message in front of your eyes, it is not used for camera image rendering, it is not controled by EasyAR.

IsCameraUnderControl¶

C#: internal protected virtual abstract bool IsCameraUnderControl { }

Provide only when creating a new frame source. It will only be accessed during ARSession.Assemble .

When the value is ture, the session will update camera transform depending on the center mode and render camera images.

When creating a HMD extension, it should be false. You should have full control of the 3D camera in the scene. You should handle camera rendering, especially in VST.

IsHMD¶

C#: internal protected virtual abstract bool IsHMD { }

Provide only when creating a new frame source. It will only be accessed during ARSession.Assemble .

If the frame source represent head mounted displays. If true, diagnostics will be displayed on a 3D board in from of camera.

Some frame filter may work different on devices.

Display¶

C#: internal protected virtual abstract IDisplay Display { }

Provide only when creating a new frame source. It will only be accessed during ARSession.Assemble .

Provide display system information. You can use Display.DefaultSystemDisplay or Display.DefaultHMDDisplay for default display.

IsAvailable¶

C#: internal protected virtual abstract Optional<bool> IsAvailable { }

Provide only when creating a new frame source. It will only be accessed during ARSession.Assemble .

If the frame source is available.

If the value equals null, FrameSource.CheckAvailability will be called and the value will be accessed after Coroutine finish.

AvailableCenterMode¶

C#: internal protected virtual IReadOnlyList< ARSession.ARCenterMode > AvailableCenterMode { }

Provide only when creating a new frame source. It will only be accessed during ARSession.Assemble .

All available center modes.

CameraFrameStarted¶

C#: internal protected virtual abstract bool CameraFrameStarted { }

Provide only when creating a new frame source. It will be accessed during the whole life time of ARSession .

If the camera frame has started to input.

DeviceCameras¶

C#: internal protected virtual abstract List< FrameSourceCamera > DeviceCameras { }

Provide only when creating a new frame source. It will be accessed when FrameSource.CameraFrameStarted is true.

Device camera to provide camera frame data. The list must contain all cameras if camera frames are provided by multiple cameras.

Make sure the value is correct when FrameSource.CameraFrameStarted is true.

Methods¶

HandleCameraFrameData¶

C#: protected bool HandleCameraFrameData(double timestamp, Image image, CameraParameters cameraParameters)

Input camera frame data.

OnSessionStart¶

C#: private override void OnSessionStart( ARSession session)

Provide only when creating a new frame source. It will only be accessed during ARSession.StartSession .

Handle session start if the frame source was assembled into ARSession.Assembly . It is designed for lazy initialization and you can do AR specific initialization work in the method.

OnSessionStop¶

C#: private override void OnSessionStop()

Provide only when creating a new frame source. It will be accessed during ARSession.StopSession or other session stop/break procedure.

Handle session stop if the frame source was assembled into ARSession.Assembly . You can use this method to destroy and resources created in ARSession.StartSession and during the session running and resotre inner state. It is ensured to be called before session destroy. If the frame source was destroyed before session, it will not be called and session will break.

TryAcquireBuffer¶

C#: protected Optional< Buffer > TryAcquireBuffer(int size)

Try acquire buffer from buffer pool.

CheckAvailability¶

C#: private virtual System.Collections.IEnumerator CheckAvailability()

Provide only when creating a new frame source. It will only be accessed during ARSession.Assemble .

Coroutine to check frame source availability when FrameSource.IsAvailable equals null.