Add DrmInitData (missed from a previous commit).

library/src/main/java/com/google/android/exoplayer/drm/DrmInitData.java

+/*
+ * Copyright (C) 2014 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 com.google.android.exoplayer.drm;
+
+import android.media.MediaDrm;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * Encapsulates initialization data required by a {@link MediaDrm} instance.
+ */
+public abstract class DrmInitData {
+
+  /**
+   * The container mime type.
+   */
+  public final String mimeType;
+
+  public DrmInitData(String mimeType) {
+    this.mimeType = mimeType;
+  }
+
+  /**
+   * Retrieves initialization data for a given DRM scheme, specified by its UUID.
+   *
+   * @param schemeUuid The DRM scheme's UUID.
+   * @return The initialization data for the scheme, or null if the scheme is not supported.
+   */
+  public abstract byte[] get(UUID schemeUuid);
+
+  /**
+   * A {@link DrmInitData} implementation that maps UUID onto scheme specific data.
+   */
+  public static final class Mapped extends DrmInitData {
+
+    private final Map<UUID, byte[]> schemeData;
+
+    public Mapped(String mimeType) {
+      super(mimeType);
+      schemeData = new HashMap<UUID, byte[]>();
+    }
+
+    @Override
+    public byte[] get(UUID schemeUuid) {
+      return schemeData.get(schemeUuid);
+    }
+
+    /**
+     * Inserts scheme specific initialization data.
+     *
+     * @param schemeUuid The scheme UUID.
+     * @param data The corresponding initialization data.
+     */
+    public void put(UUID schemeUuid, byte[] data) {
+      schemeData.put(schemeUuid, data);
+    }
+
+    /**
+     * Inserts scheme specific initialization data.
+     *
+     * @param data A mapping from scheme UUID to initialization data.
+     */
+    public void putAll(Map<UUID, byte[]> data) {
+      schemeData.putAll(data);
+    }
+
+  }
+
+  /**
+   * A {@link DrmInitData} implementation that returns the same initialization data for all schemes.
+   */
+  public static final class Universal extends DrmInitData {
+
+    private byte[] data;
+
+    public Universal(String mimeType, byte[] data) {
+      super(mimeType);
+      this.data = data;
+    }
+
+    @Override
+    public byte[] get(UUID schemeUuid) {
+      return data;
+    }
+
+  }
+
+}