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/*
* Copyright (C) 2016 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 org.mozilla.thirdparty.com.google.android.exoplayer2.upstream;
import android.os.Handler;
import androidx.annotation.Nullable;
/**
* Provides estimates of the currently available bandwidth.
*/
public interface BandwidthMeter {
/**
* A listener of {@link BandwidthMeter} events.
*/
interface EventListener {
/**
* Called periodically to indicate that bytes have been transferred or the estimated bitrate has
* changed.
*
* <p>Note: The estimated bitrate is typically derived from more information than just {@code
* bytes} and {@code elapsedMs}.
*
* @param elapsedMs The time taken to transfer {@code bytesTransferred}, in milliseconds. This
* is at most the elapsed time since the last callback, but may be less if there were
* periods during which data was not being transferred.
* @param bytesTransferred The number of bytes transferred since the last callback.
* @param bitrateEstimate The estimated bitrate in bits/sec.
*/
void onBandwidthSample(int elapsedMs, long bytesTransferred, long bitrateEstimate);
}
/** Returns the estimated bitrate. */
long getBitrateEstimate();
/**
* Returns the {@link TransferListener} that this instance uses to gather bandwidth information
* from data transfers. May be null if the implementation does not listen to data transfers.
*/
@Nullable
TransferListener getTransferListener();
/**
* Adds an {@link EventListener}.
*
* @param eventHandler A handler for events.
* @param eventListener A listener of events.
*/
void addEventListener(Handler eventHandler, EventListener eventListener);
/**
* Removes an {@link EventListener}.
*
* @param eventListener The listener to be removed.
*/
void removeEventListener(EventListener eventListener);
}
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