| /* |
| * Copyright (C) 2020 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 android.telephony.ims; |
| |
| import android.annotation.IntRange; |
| import android.annotation.NonNull; |
| import android.annotation.SystemApi; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| |
| import java.util.Arrays; |
| import java.util.Objects; |
| |
| /** |
| * A representation of an RTP header extension. |
| * <p> |
| * Per RFC8285, an RTP header extension consists of both a local identifier in the range 1-14, an |
| * 8-bit length indicator and a number of extension data bytes equivalent to the stated length. |
| * @hide |
| */ |
| @SystemApi |
| public final class RtpHeaderExtension implements Parcelable { |
| private int mLocalIdentifier; |
| private byte[] mExtensionData; |
| |
| /** |
| * Creates a new {@link RtpHeaderExtension}. |
| * @param localIdentifier The local identifier for this RTP header extension. |
| * @param extensionData The data for this RTP header extension. |
| * @throws IllegalArgumentException if {@code extensionId} is not in the range 1-14. |
| * @throws NullPointerException if {@code extensionData} is null. |
| */ |
| public RtpHeaderExtension(@IntRange(from = 1, to = 14) int localIdentifier, |
| @NonNull byte[] extensionData) { |
| if (localIdentifier < 1 || localIdentifier > 13) { |
| throw new IllegalArgumentException("localIdentifier must be in range 1-14"); |
| } |
| if (extensionData == null) { |
| throw new NullPointerException("extensionDa is required."); |
| } |
| mLocalIdentifier = localIdentifier; |
| mExtensionData = extensionData; |
| } |
| |
| /** |
| * Creates a new instance of {@link RtpHeaderExtension} from a parcel. |
| * @param in The parceled data to read. |
| */ |
| private RtpHeaderExtension(@NonNull Parcel in) { |
| mLocalIdentifier = in.readInt(); |
| mExtensionData = in.createByteArray(); |
| } |
| |
| /** |
| * The local identifier for the RTP header extension. |
| * <p> |
| * Per RFC8285, the extension ID is a value in the range 1-14 (0 is reserved for padding and |
| * 15 is reserved for the one-byte header form. |
| * <p> |
| * Within the current call, this extension ID will match one of the |
| * {@link RtpHeaderExtensionType#getLocalIdentifier()}s. |
| * |
| * @return The local identifier for this RTP header extension. |
| */ |
| @IntRange(from = 1, to = 14) |
| public int getLocalIdentifier() { |
| return mLocalIdentifier; |
| } |
| |
| /** |
| * The data payload for the RTP header extension. |
| * <p> |
| * Per RFC8285 Sec 4.3, an RTP header extension includes an 8-bit length field which indicate |
| * how many bytes of data are present in the RTP header extension. The extension includes this |
| * many bytes of actual data. |
| * <p> |
| * We represent this as a byte array who's length is equivalent to the 8-bit length field. |
| * @return RTP header extension data payload. The payload may be up to 255 bytes in length. |
| */ |
| public @NonNull byte[] getExtensionData() { |
| return mExtensionData; |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(@NonNull Parcel dest, int flags) { |
| dest.writeInt(mLocalIdentifier); |
| dest.writeByteArray(mExtensionData); |
| } |
| |
| public static final @NonNull Creator<RtpHeaderExtension> CREATOR = |
| new Creator<RtpHeaderExtension>() { |
| @Override |
| public RtpHeaderExtension createFromParcel(@NonNull Parcel in) { |
| return new RtpHeaderExtension(in); |
| } |
| |
| @Override |
| public RtpHeaderExtension[] newArray(int size) { |
| return new RtpHeaderExtension[size]; |
| } |
| }; |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| RtpHeaderExtension that = (RtpHeaderExtension) o; |
| return mLocalIdentifier == that.mLocalIdentifier |
| && Arrays.equals(mExtensionData, that.mExtensionData); |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = Objects.hash(mLocalIdentifier); |
| result = 31 * result + Arrays.hashCode(mExtensionData); |
| return result; |
| } |
| } |