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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.trackselection;
import android.os.SystemClock;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
import org.mozilla.thirdparty.com.google.android.exoplayer2.source.TrackGroup;
import org.mozilla.thirdparty.com.google.android.exoplayer2.source.chunk.MediaChunk;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
/**
* An abstract base class suitable for most {@link TrackSelection} implementations.
*/
public abstract class BaseTrackSelection implements TrackSelection {
/**
* The selected {@link TrackGroup}.
*/
protected final TrackGroup group;
/**
* The number of selected tracks within the {@link TrackGroup}. Always greater than zero.
*/
protected final int length;
/**
* The indices of the selected tracks in {@link #group}, in order of decreasing bandwidth.
*/
protected final int[] tracks;
/**
* The {@link Format}s of the selected tracks, in order of decreasing bandwidth.
*/
private final Format[] formats;
/**
* Selected track blacklist timestamps, in order of decreasing bandwidth.
*/
private final long[] blacklistUntilTimes;
// Lazily initialized hashcode.
private int hashCode;
/**
* @param group The {@link TrackGroup}. Must not be null.
* @param tracks The indices of the selected tracks within the {@link TrackGroup}. Must not be
* null or empty. May be in any order.
*/
public BaseTrackSelection(TrackGroup group, int... tracks) {
Assertions.checkState(tracks.length > 0);
this.group = Assertions.checkNotNull(group);
this.length = tracks.length;
// Set the formats, sorted in order of decreasing bandwidth.
formats = new Format[length];
for (int i = 0; i < tracks.length; i++) {
formats[i] = group.getFormat(tracks[i]);
}
Arrays.sort(formats, new DecreasingBandwidthComparator());
// Set the format indices in the same order.
this.tracks = new int[length];
for (int i = 0; i < length; i++) {
this.tracks[i] = group.indexOf(formats[i]);
}
blacklistUntilTimes = new long[length];
}
@Override
public void enable() {
// Do nothing.
}
@Override
public void disable() {
// Do nothing.
}
@Override
public final TrackGroup getTrackGroup() {
return group;
}
@Override
public final int length() {
return tracks.length;
}
@Override
public final Format getFormat(int index) {
return formats[index];
}
@Override
public final int getIndexInTrackGroup(int index) {
return tracks[index];
}
@Override
@SuppressWarnings("ReferenceEquality")
public final int indexOf(Format format) {
for (int i = 0; i < length; i++) {
if (formats[i] == format) {
return i;
}
}
return C.INDEX_UNSET;
}
@Override
public final int indexOf(int indexInTrackGroup) {
for (int i = 0; i < length; i++) {
if (tracks[i] == indexInTrackGroup) {
return i;
}
}
return C.INDEX_UNSET;
}
@Override
public final Format getSelectedFormat() {
return formats[getSelectedIndex()];
}
@Override
public final int getSelectedIndexInTrackGroup() {
return tracks[getSelectedIndex()];
}
@Override
public void onPlaybackSpeed(float playbackSpeed) {
// Do nothing.
}
@Override
public int evaluateQueueSize(long playbackPositionUs, List<? extends MediaChunk> queue) {
return queue.size();
}
@Override
public final boolean blacklist(int index, long blacklistDurationMs) {
long nowMs = SystemClock.elapsedRealtime();
boolean canBlacklist = isBlacklisted(index, nowMs);
for (int i = 0; i < length && !canBlacklist; i++) {
canBlacklist = i != index && !isBlacklisted(i, nowMs);
}
if (!canBlacklist) {
return false;
}
blacklistUntilTimes[index] =
Math.max(
blacklistUntilTimes[index],
Util.addWithOverflowDefault(nowMs, blacklistDurationMs, Long.MAX_VALUE));
return true;
}
/**
* Returns whether the track at the specified index in the selection is blacklisted.
*
* @param index The index of the track in the selection.
* @param nowMs The current time in the timebase of {@link SystemClock#elapsedRealtime()}.
*/
protected final boolean isBlacklisted(int index, long nowMs) {
return blacklistUntilTimes[index] > nowMs;
}
// Object overrides.
@Override
public int hashCode() {
if (hashCode == 0) {
hashCode = 31 * System.identityHashCode(group) + Arrays.hashCode(tracks);
}
return hashCode;
}
// Track groups are compared by identity not value, as distinct groups may have the same value.
@Override
@SuppressWarnings({"ReferenceEquality", "EqualsGetClass"})
public boolean equals(@Nullable Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
BaseTrackSelection other = (BaseTrackSelection) obj;
return group == other.group && Arrays.equals(tracks, other.tracks);
}
/**
* Sorts {@link Format} objects in order of decreasing bandwidth.
*/
private static final class DecreasingBandwidthComparator implements Comparator<Format> {
@Override
public int compare(Format a, Format b) {
return b.bitrate - a.bitrate;
}
}
}
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