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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;
import org.mozilla.thirdparty.com.google.android.exoplayer2.source.TrackGroup;
import org.mozilla.thirdparty.com.google.android.exoplayer2.source.TrackGroupArray;
import org.mozilla.thirdparty.com.google.android.exoplayer2.trackselection.TrackSelectionArray;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.Allocator;
/**
* Controls buffering of media.
*/
public interface LoadControl {
/**
* Called by the player when prepared with a new source.
*/
void onPrepared();
/**
* Called by the player when a track selection occurs.
*
* @param renderers The renderers.
* @param trackGroups The {@link TrackGroup}s from which the selection was made.
* @param trackSelections The track selections that were made.
*/
void onTracksSelected(Renderer[] renderers, TrackGroupArray trackGroups,
TrackSelectionArray trackSelections);
/**
* Called by the player when stopped.
*/
void onStopped();
/**
* Called by the player when released.
*/
void onReleased();
/**
* Returns the {@link Allocator} that should be used to obtain media buffer allocations.
*/
Allocator getAllocator();
/**
* Returns the duration of media to retain in the buffer prior to the current playback position,
* for fast backward seeking.
* <p>
* Note: If {@link #retainBackBufferFromKeyframe()} is false then seeking in the back-buffer will
* only be fast if the back-buffer contains a keyframe prior to the seek position.
* <p>
* Note: Implementations should return a single value. Dynamic changes to the back-buffer are not
* currently supported.
*
* @return The duration of media to retain in the buffer prior to the current playback position,
* in microseconds.
*/
long getBackBufferDurationUs();
/**
* Returns whether media should be retained from the keyframe before the current playback position
* minus {@link #getBackBufferDurationUs()}, rather than any sample before or at that position.
* <p>
* Warning: Returning true will cause the back-buffer size to depend on the spacing of keyframes
* in the media being played. Returning true is not recommended unless you control the media and
* are comfortable with the back-buffer size exceeding {@link #getBackBufferDurationUs()} by as
* much as the maximum duration between adjacent keyframes in the media.
* <p>
* Note: Implementations should return a single value. Dynamic changes to the back-buffer are not
* currently supported.
*
* @return Whether media should be retained from the keyframe before the current playback position
* minus {@link #getBackBufferDurationUs()}, rather than any sample before or at that position.
*/
boolean retainBackBufferFromKeyframe();
/**
* Called by the player to determine whether it should continue to load the source.
*
* @param bufferedDurationUs The duration of media that's currently buffered.
* @param playbackSpeed The current playback speed.
* @return Whether the loading should continue.
*/
boolean shouldContinueLoading(long bufferedDurationUs, float playbackSpeed);
/**
* Called repeatedly by the player when it's loading the source, has yet to start playback, and
* has the minimum amount of data necessary for playback to be started. The value returned
* determines whether playback is actually started. The load control may opt to return {@code
* false} until some condition has been met (e.g. a certain amount of media is buffered).
*
* @param bufferedDurationUs The duration of media that's currently buffered.
* @param playbackSpeed The current playback speed.
* @param rebuffering Whether the player is rebuffering. A rebuffer is defined to be caused by
* buffer depletion rather than a user action. Hence this parameter is false during initial
* buffering and when buffering as a result of a seek operation.
* @return Whether playback should be allowed to start or resume.
*/
boolean shouldStartPlayback(long bufferedDurationUs, float playbackSpeed, boolean rebuffering);
}
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