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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.source;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
// TODO: Clarify the requirements for implementing this interface [Internal ref: b/36250203].
/**
* A loader that can proceed in approximate synchronization with other loaders.
*/
public interface SequenceableLoader {
/**
* A callback to be notified of {@link SequenceableLoader} events.
*/
interface Callback<T extends SequenceableLoader> {
/**
* Called by the loader to indicate that it wishes for its {@link #continueLoading(long)} method
* to be called when it can continue to load data. Called on the playback thread.
*/
void onContinueLoadingRequested(T source);
}
/**
* Returns an estimate of the position up to which data is buffered.
*
* @return An estimate of the absolute position in microseconds up to which data is buffered, or
* {@link C#TIME_END_OF_SOURCE} if the data is fully buffered.
*/
long getBufferedPositionUs();
/**
* Returns the next load time, or {@link C#TIME_END_OF_SOURCE} if loading has finished.
*/
long getNextLoadPositionUs();
/**
* Attempts to continue loading.
*
* @param positionUs The current playback position in microseconds. If playback of the period to
* which this loader belongs has not yet started, the value will be the starting position
* in the period minus the duration of any media in previous periods still to be played.
* @return True if progress was made, meaning that {@link #getNextLoadPositionUs()} will return
* a different value than prior to the call. False otherwise.
*/
boolean continueLoading(long positionUs);
/** Returns whether the loader is currently loading. */
boolean isLoading();
/**
* Re-evaluates the buffer given the playback position.
*
* <p>Re-evaluation may discard buffered media so that it can be re-buffered in a different
* quality.
*
* @param positionUs The current playback position in microseconds. If playback of this period has
* not yet started, the value will be the starting position in this period minus the duration
* of any media in previous periods still to be played.
*/
void reevaluateBuffer(long positionUs);
}
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