AVPlayerItemOutputPullDelegate (moe.platform.ios API)

```
public interface AVPlayerItemOutputPullDelegate
```
[@protocol] AVPlayerItemOutputPullDelegate Defines common delegate methods for objects participating in AVPlayerItemOutput pull sample output acquisition.

Method Summary

All Methods Instance Methods Default Methods
Modifier and Type	Method	Description
`default void`	`outputMediaDataWillChange(@NotNull AVPlayerItemOutput sender)`	outputMediaDataWillChange: A method invoked once, prior to a new sample, if the AVPlayerItemOutput sender was previously messaged requestNotificationOfMediaDataChangeWithAdvanceInterval:.
`default void`	`outputSequenceWasFlushed(@NotNull AVPlayerItemOutput output)`	outputSequenceWasFlushed: A method invoked when the output is commencing a new sequence.

- Method Detail
  - outputMediaDataWillChange
```
default void outputMediaDataWillChange(@NotNull
                                       @NotNull AVPlayerItemOutput sender)
```
    outputMediaDataWillChange: A method invoked once, prior to a new sample, if the AVPlayerItemOutput sender was previously messaged requestNotificationOfMediaDataChangeWithAdvanceInterval:. This method is invoked once after the sender is messaged requestNotificationOfMediaDataChangeWithAdvanceInterval:. API-Since: 6.0
  - outputSequenceWasFlushed
```
default void outputSequenceWasFlushed(@NotNull
                                      @NotNull AVPlayerItemOutput output)
```
    outputSequenceWasFlushed: A method invoked when the output is commencing a new sequence. This method is invoked after any seeking and change in playback direction. If you are maintaining any queued future samples, copied previously, you may want to discard these after receiving this message. API-Since: 6.0