Properly document in code how to pass CustomData to PlayReady DRM.

Issue: #339

demo/src/main/java/com/google/android/exoplayer/demo/DemoUtil.java

@@ -35,15 +35,12 @@ import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.Map;
-import java.util.UUID;
 
 /**
  * Utility methods for the demo application.
  */
 public class DemoUtil {
 
-  public static final UUID WIDEVINE_UUID = new UUID(0xEDEF8BA979D64ACEL, 0xA3C827DCD51D21EDL);
-
   public static final int TYPE_DASH = 0;
   public static final int TYPE_SS = 1;
   public static final int TYPE_OTHER = 2;

demo/src/main/java/com/google/android/exoplayer/demo/player/DashRendererBuilder.java

@@ -40,7 +40,6 @@ import com.google.android.exoplayer.dash.mpd.Representation;
 import com.google.android.exoplayer.dash.mpd.UtcTimingElement;
 import com.google.android.exoplayer.dash.mpd.UtcTimingElementResolver;
 import com.google.android.exoplayer.dash.mpd.UtcTimingElementResolver.UtcTimingCallback;
-import com.google.android.exoplayer.demo.DemoUtil;
 import com.google.android.exoplayer.demo.player.DemoPlayer.RendererBuilder;
 import com.google.android.exoplayer.demo.player.DemoPlayer.RendererBuilderCallback;
 import com.google.android.exoplayer.drm.DrmSessionManager;
@@ -364,9 +363,9 @@ public class DashRendererBuilder implements RendererBuilder,
     public static Pair<DrmSessionManager, Boolean> getDrmSessionManagerData(DemoPlayer player,
         MediaDrmCallback drmCallback) throws UnsupportedDrmException {
       try {
-        StreamingDrmSessionManager streamingDrmSessionManager = new StreamingDrmSessionManager(
+        StreamingDrmSessionManager streamingDrmSessionManager =
-            DemoUtil.WIDEVINE_UUID, player.getPlaybackLooper(), drmCallback, null,
+            StreamingDrmSessionManager.newWidevineInstance(player.getPlaybackLooper(), drmCallback,
-            player.getMainHandler(), player);
+            null, player.getMainHandler(), player);
         return Pair.create((DrmSessionManager) streamingDrmSessionManager,
             getWidevineSecurityLevel(streamingDrmSessionManager) == SECURITY_LEVEL_1);
       } catch (UnsupportedSchemeException e) {

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

@@ -29,6 +29,7 @@ import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
 import android.os.Message;
+import android.text.TextUtils;
 
 import java.util.HashMap;
 import java.util.UUID;
@@ -55,6 +56,24 @@ public class StreamingDrmSessionManager implements DrmSessionManager {
 
   }
 
+  /**
+   * UUID for the Widevine DRM scheme.
+   */
+  public static final UUID WIDEVINE_UUID = new UUID(0xEDEF8BA979D64ACEL, 0xA3C827DCD51D21EDL);
+
+  /**
+   * UUID for the PlayReady DRM scheme.
+   * <p>
+   * Note that PlayReady is unsupported by most Android devices, with the exception of Android TV
+   * devices, which do provide support.
+   */
+  public static final UUID PLAYREADY_UUID = new UUID(0x9A04F07998404286L, 0xAB92E65BE0885F95L);
+
+  /**
+   * The key to use when passing CustomData to a PlayReady instance in an optional parameter map.
+   */
+  public static final String PLAYREADY_CUSTOM_DATA_KEY = "PRCustomData";
+
   private static final int MSG_PROVISION = 0;
   private static final int MSG_KEYS = 1;
 
@@ -80,6 +99,55 @@ public class StreamingDrmSessionManager implements DrmSessionManager {
   private byte[] schemePsshData;
   private byte[] sessionId;
 
+  /**
+   * Instantiates a new instance using the Widevine scheme.
+   *
+   * @param playbackLooper The looper associated with the media playback thread. Should usually be
+   *     obtained using {@link com.google.android.exoplayer.ExoPlayer#getPlaybackLooper()}.
+   * @param callback Performs key and provisioning requests.
+   * @param optionalKeyRequestParameters An optional map of parameters to pass as the last argument
+   *     to {@link MediaDrm#getKeyRequest(byte[], byte[], String, int, HashMap)}. May be null.
+   * @param eventHandler A handler to use when delivering events to {@code eventListener}. May be
+   *     null if delivery of events is not required.
+   * @param eventListener A listener of events. May be null if delivery of events is not required.
+   * @throws UnsupportedSchemeException If the specified DRM scheme is not supported.
+   */
+  public static StreamingDrmSessionManager newWidevineInstance(Looper playbackLooper,
+      MediaDrmCallback callback, HashMap<String, String> optionalKeyRequestParameters,
+      Handler eventHandler, EventListener eventListener) throws UnsupportedSchemeException {
+    return new StreamingDrmSessionManager(WIDEVINE_UUID, playbackLooper, callback,
+        optionalKeyRequestParameters, eventHandler, eventListener);
+  }
+
+  /**
+   * Instantiates a new instance using the PlayReady scheme.
+   * <p>
+   * Note that PlayReady is unsupported by most Android devices, with the exception of Android TV
+   * devices, which do provide support.
+   *
+   * @param playbackLooper The looper associated with the media playback thread. Should usually be
+   *     obtained using {@link com.google.android.exoplayer.ExoPlayer#getPlaybackLooper()}.
+   * @param callback Performs key and provisioning requests.
+   * @param customData Optional custom data to include in requests generated by the instance.
+   * @param eventHandler A handler to use when delivering events to {@code eventListener}. May be
+   *     null if delivery of events is not required.
+   * @param eventListener A listener of events. May be null if delivery of events is not required.
+   * @throws UnsupportedSchemeException If the specified DRM scheme is not supported.
+   */
+  public static StreamingDrmSessionManager newPlayReadyInstance(Looper playbackLooper,
+      MediaDrmCallback callback, String customData, Handler eventHandler,
+      EventListener eventListener) throws UnsupportedSchemeException {
+    HashMap<String, String> optionalKeyRequestParameters;
+    if (!TextUtils.isEmpty(customData)) {
+      optionalKeyRequestParameters = new HashMap<String, String>();
+      optionalKeyRequestParameters.put(PLAYREADY_CUSTOM_DATA_KEY, customData);
+    } else {
+      optionalKeyRequestParameters = null;
+    }
+    return new StreamingDrmSessionManager(PLAYREADY_UUID, playbackLooper, callback,
+        optionalKeyRequestParameters, eventHandler, eventListener);
+  }
+
   /**
    * @param uuid The UUID of the drm scheme.
    * @param playbackLooper The looper associated with the media playback thread. Should usually be