TimeToFirstByteEstimator (ExoPlayer library)

```
public interface TimeToFirstByteEstimator
```
Provides an estimate of the time to first byte of a transfer.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`getTimeToFirstByteEstimateUs()`	Returns the estimated time to first byte of the response body, in microseconds, or `C.TIME_UNSET` if no estimate is available.
`void`	`onTransferInitializing(DataSpec dataSpec)`	Called when a transfer is being initialized.
`void`	`onTransferStart(DataSpec dataSpec)`	Called when a transfer starts.
`void`	`reset()`	Resets the estimator.

- Method Detail
  - getTimeToFirstByteEstimateUs
```
long getTimeToFirstByteEstimateUs()
```
    Returns the estimated time to first byte of the response body, in microseconds, or C.TIME_UNSET if no estimate is available.
  - reset
```
void reset()
```
    Resets the estimator.
  - onTransferInitializing
```
void onTransferInitializing(DataSpec dataSpec)
```
    Called when a transfer is being initialized.
    
    Parameters:
    
    dataSpec - Describes the data for which the transfer is initialized.
  - onTransferStart
```
void onTransferStart(DataSpec dataSpec)
```
    Called when a transfer starts.
    
    Parameters:
    
    dataSpec - Describes the data being transferred.