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If you use the IAB Open Measurement Interface Definition (OMID) and run Google IMA ads, all custom video controls that overlay the media element must be registered as friendly obstructions. Friendly obstructions are views -- such as video controls -- that are essential to the user’s experience but do not impact viewability.
The `JWFriendlyAdObstructions` class enables you to register fully transparent overlays or small buttons. Once registered, your custom video controls are excluded from the ad viewability measurements that the <a href="https://iabtechlab.com/standards/open-measurement-sdk/" target="_blank">Open Measurement SDK</a> calculates.
The following table lists the views that can and cannot be registered.
| Permitted | Not Permitted |
| • Transparent overlay used to capture user taps<br /><br />• Transient buttons such as the following:<br />      ◦ Pause<br />      ◦ Play<br />      ◦ Fullscreen<br />      ◦ Cast/AirPlay<br />      ◦ Collapse<br />      ◦ Progress/Seek<br />      ◦ Other playback-related actions | • Watermarks<br />• Pop-ups<br />• Dialogs<br /> • Non-transient buttons<br /> • Other obscuring views<br /><br /><br /><br /><br /><br /> |
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## Register friendly obstructions
Use the following steps and code sample to register a custom video control as a friendly ad obstruction:
Add the custom view, for example `
customControlbar`, to your app.Use `
getJWFriendlyAdObstructions()` to get a reference to the list of friendly ad obstructions.Add the custom view to the `
JWFriendlyAdObstructions` list.
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