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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.upstream;
import android.net.Uri;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
import java.net.SocketException;
/** A UDP {@link DataSource}. */
public final class UdpDataSource extends BaseDataSource {
/**
* Thrown when an error is encountered when trying to read from a {@link UdpDataSource}.
*/
public static final class UdpDataSourceException extends IOException {
public UdpDataSourceException(IOException cause) {
super(cause);
}
}
/**
* The default maximum datagram packet size, in bytes.
*/
public static final int DEFAULT_MAX_PACKET_SIZE = 2000;
/** The default socket timeout, in milliseconds. */
public static final int DEFAULT_SOCKET_TIMEOUT_MILLIS = 8 * 1000;
private final int socketTimeoutMillis;
private final byte[] packetBuffer;
private final DatagramPacket packet;
@Nullable private Uri uri;
@Nullable private DatagramSocket socket;
@Nullable private MulticastSocket multicastSocket;
@Nullable private InetAddress address;
@Nullable private InetSocketAddress socketAddress;
private boolean opened;
private int packetRemaining;
public UdpDataSource() {
this(DEFAULT_MAX_PACKET_SIZE);
}
/**
* Constructs a new instance.
*
* @param maxPacketSize The maximum datagram packet size, in bytes.
*/
public UdpDataSource(int maxPacketSize) {
this(maxPacketSize, DEFAULT_SOCKET_TIMEOUT_MILLIS);
}
/**
* Constructs a new instance.
*
* @param maxPacketSize The maximum datagram packet size, in bytes.
* @param socketTimeoutMillis The socket timeout in milliseconds. A timeout of zero is interpreted
* as an infinite timeout.
*/
public UdpDataSource(int maxPacketSize, int socketTimeoutMillis) {
super(/* isNetwork= */ true);
this.socketTimeoutMillis = socketTimeoutMillis;
packetBuffer = new byte[maxPacketSize];
packet = new DatagramPacket(packetBuffer, 0, maxPacketSize);
}
@Override
public long open(DataSpec dataSpec) throws UdpDataSourceException {
uri = dataSpec.uri;
String host = uri.getHost();
int port = uri.getPort();
transferInitializing(dataSpec);
try {
address = InetAddress.getByName(host);
socketAddress = new InetSocketAddress(address, port);
if (address.isMulticastAddress()) {
multicastSocket = new MulticastSocket(socketAddress);
multicastSocket.joinGroup(address);
socket = multicastSocket;
} else {
socket = new DatagramSocket(socketAddress);
}
} catch (IOException e) {
throw new UdpDataSourceException(e);
}
try {
socket.setSoTimeout(socketTimeoutMillis);
} catch (SocketException e) {
throw new UdpDataSourceException(e);
}
opened = true;
transferStarted(dataSpec);
return C.LENGTH_UNSET;
}
@Override
public int read(byte[] buffer, int offset, int readLength) throws UdpDataSourceException {
if (readLength == 0) {
return 0;
}
if (packetRemaining == 0) {
// We've read all of the data from the current packet. Get another.
try {
socket.receive(packet);
} catch (IOException e) {
throw new UdpDataSourceException(e);
}
packetRemaining = packet.getLength();
bytesTransferred(packetRemaining);
}
int packetOffset = packet.getLength() - packetRemaining;
int bytesToRead = Math.min(packetRemaining, readLength);
System.arraycopy(packetBuffer, packetOffset, buffer, offset, bytesToRead);
packetRemaining -= bytesToRead;
return bytesToRead;
}
@Override
@Nullable
public Uri getUri() {
return uri;
}
@Override
public void close() {
uri = null;
if (multicastSocket != null) {
try {
multicastSocket.leaveGroup(address);
} catch (IOException e) {
// Do nothing.
}
multicastSocket = null;
}
if (socket != null) {
socket.close();
socket = null;
}
address = null;
socketAddress = null;
packetRemaining = 0;
if (opened) {
opened = false;
transferEnded();
}
}
}
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