1 files changed, 73 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/metadata/emsg/EventMessageEncoder.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/metadata/emsg/EventMessageEncoder.java
new file mode 100644
index 0000000000..261e39ae70
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/metadata/emsg/EventMessageEncoder.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2017 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.metadata.emsg;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+/**
+ * Encodes data that can be decoded by {@link EventMessageDecoder}. This class isn't thread safe.
+ */
+public final class EventMessageEncoder {
+
+  private final ByteArrayOutputStream byteArrayOutputStream;
+  private final DataOutputStream dataOutputStream;
+
+  public EventMessageEncoder() {
+    byteArrayOutputStream = new ByteArrayOutputStream(512);
+    dataOutputStream = new DataOutputStream(byteArrayOutputStream);
+  }
+
+  /**
+   * Encodes an {@link EventMessage} to a byte array that can be decoded by {@link
+   * EventMessageDecoder}.
+   *
+   * @param eventMessage The event message to be encoded.
+   * @return The serialized byte array.
+   */
+  public byte[] encode(EventMessage eventMessage) {
+    byteArrayOutputStream.reset();
+    try {
+      writeNullTerminatedString(dataOutputStream, eventMessage.schemeIdUri);
+      String nonNullValue = eventMessage.value != null ? eventMessage.value : "";
+      writeNullTerminatedString(dataOutputStream, nonNullValue);
+      writeUnsignedInt(dataOutputStream, eventMessage.durationMs);
+      writeUnsignedInt(dataOutputStream, eventMessage.id);
+      dataOutputStream.write(eventMessage.messageData);
+      dataOutputStream.flush();
+      return byteArrayOutputStream.toByteArray();
+    } catch (IOException e) {
+      // Should never happen.
+      throw new RuntimeException(e);
+    }
+  }
+
+  private static void writeNullTerminatedString(DataOutputStream dataOutputStream, String value)
+      throws IOException {
+    dataOutputStream.writeBytes(value);
+    dataOutputStream.writeByte(0);
+  }
+
+  private static void writeUnsignedInt(DataOutputStream outputStream, long value)
+      throws IOException {
+    outputStream.writeByte((int) (value >>> 24) & 0xFF);
+    outputStream.writeByte((int) (value >>> 16) & 0xFF);
+    outputStream.writeByte((int) (value >>> 8) & 0xFF);
+    outputStream.writeByte((int) value & 0xFF);
+  }
+
+}