TimeToFirstByteEstimator.java
/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.media3.exoplayer.upstream;
import androidx.media3.common.C;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.datasource.DataSpec;
/** Provides an estimate of the time to first byte of a transfer. */
@UnstableApi
public interface TimeToFirstByteEstimator {
/**
* Returns the estimated time to first byte of the response body, in microseconds, or {@link
* C#TIME_UNSET} if no estimate is available.
*/
long getTimeToFirstByteEstimateUs();
/** Resets the estimator. */
void reset();
/**
* Called when a transfer is being initialized.
*
* @param dataSpec Describes the data for which the transfer is initialized.
*/
void onTransferInitializing(DataSpec dataSpec);
/**
* Called when a transfer starts.
*
* @param dataSpec Describes the data being transferred.
*/
void onTransferStart(DataSpec dataSpec);
}