ITranscoderOverlayProvider (Wowza Streaming Engine 4 API)

```
public interface ITranscoderOverlayProvider
```
ITranscoderOverlayProvider: interface to add and remove video overlays.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addOverlay(int index, TranscoderVideoOverlayFrame overlay)`	Add an overlay to a video stream.
`void`	`clearOverlay(int index)`	Clear video overlay
`java.util.Map<Integer,TranscoderVideoOverlayFrame>`	`getAndClearPendingOverlays()`	Get a list of pending overlay requests and clear the pending overlay queue.
`boolean`	`isOverlayAvailable()`	Returns true if there is a pending overlay request.

- Method Detail
  - addOverlay
```
void addOverlay(int index,
                TranscoderVideoOverlayFrame overlay)
```
    Add an overlay to a video stream.
    
    Parameters:
    
    index - over lay index (zero is bottom in z-order)
    
    overlay - overlay object
  - clearOverlay
```
void clearOverlay(int index)
```
    Clear video overlay
    
    Parameters:
    
    index - over lay index (zero is bottom in z-order)
  - isOverlayAvailable
```
boolean isOverlayAvailable()
```
    Returns true if there is a pending overlay request.
    
    Returns:
    
    true if there is a pending overlay request
  - getAndClearPendingOverlays
```
java.util.Map<Integer,TranscoderVideoOverlayFrame> getAndClearPendingOverlays()
```
    Get a list of pending overlay requests and clear the pending overlay queue.
    
    Returns:
    
    list of pending overlay requests