1 files changed, 176 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/UdpDataSource.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/UdpDataSource.java
new file mode 100644
index 0000000000..8e9b44563c
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/upstream/UdpDataSource.java
@@ -0,0 +1,176 @@
+/*
+ * 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();
+    }
+  }
+
+}