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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 android.os.Parcel;
import android.os.Parcelable;
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.util.Assertions;
import java.util.Arrays;
// TODO: Add an allowMultipleStreams boolean to indicate where the one stream per group restriction
// does not apply.
/**
* Defines a group of tracks exposed by a {@link MediaPeriod}.
*
* <p>A {@link MediaPeriod} is only able to provide one {@link SampleStream} corresponding to a
* group at any given time, however this {@link SampleStream} may adapt between multiple tracks
* within the group.
*/
public final class TrackGroup implements Parcelable {
/**
* The number of tracks in the group.
*/
public final int length;
private final Format[] formats;
// Lazily initialized hashcode.
private int hashCode;
/**
* @param formats The track formats. Must not be null, contain null elements or be of length 0.
*/
public TrackGroup(Format... formats) {
Assertions.checkState(formats.length > 0);
this.formats = formats;
this.length = formats.length;
}
/* package */ TrackGroup(Parcel in) {
length = in.readInt();
formats = new Format[length];
for (int i = 0; i < length; i++) {
formats[i] = in.readParcelable(Format.class.getClassLoader());
}
}
/**
* Returns the format of the track at a given index.
*
* @param index The index of the track.
* @return The track's format.
*/
public Format getFormat(int index) {
return formats[index];
}
/**
* Returns the index of the track with the given format in the group. The format is located by
* identity so, for example, {@code group.indexOf(group.getFormat(index)) == index} even if
* multiple tracks have formats that contain the same values.
*
* @param format The format.
* @return The index of the track, or {@link C#INDEX_UNSET} if no such track exists.
*/
@SuppressWarnings("ReferenceEquality")
public int indexOf(Format format) {
for (int i = 0; i < formats.length; i++) {
if (format == formats[i]) {
return i;
}
}
return C.INDEX_UNSET;
}
@Override
public int hashCode() {
if (hashCode == 0) {
int result = 17;
result = 31 * result + Arrays.hashCode(formats);
hashCode = result;
}
return hashCode;
}
@Override
public boolean equals(@Nullable Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
TrackGroup other = (TrackGroup) obj;
return length == other.length && Arrays.equals(formats, other.formats);
}
// Parcelable implementation.
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(length);
for (int i = 0; i < length; i++) {
dest.writeParcelable(formats[i], 0);
}
}
public static final Parcelable.Creator<TrackGroup> CREATOR =
new Parcelable.Creator<TrackGroup>() {
@Override
public TrackGroup createFromParcel(Parcel in) {
return new TrackGroup(in);
}
@Override
public TrackGroup[] newArray(int size) {
return new TrackGroup[size];
}
};
}
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