Allow out-of-band pssh data for DASH playbacks.

This fixes the referenced issue, except that the MPD parser
needs to actually parse out UUID and binary data for schemes
that we wish to support. Alternatively, it's easy to applications
to do this themselves by extending the parser and overriding
the parseContentProtection and buildContentProtection methods.

Github Issue: google#119

library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java

@@ -31,6 +31,7 @@
 import com.google.android.exoplayer.chunk.Mp4MediaChunk;
 import com.google.android.exoplayer.chunk.SingleSampleMediaChunk;
 import com.google.android.exoplayer.dash.mpd.AdaptationSet;
+import com.google.android.exoplayer.dash.mpd.ContentProtection;
 import com.google.android.exoplayer.dash.mpd.MediaPresentationDescription;
 import com.google.android.exoplayer.dash.mpd.Period;
 import com.google.android.exoplayer.dash.mpd.RangedUri;
@@ -53,6 +54,8 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.UUID;
 
 /**
  * An {@link ChunkSource} for DASH streams.
@@ -92,6 +95,7 @@ public NoAdaptationSetException(String message) {
   private final ManifestFetcher<MediaPresentationDescription> manifestFetcher;
   private final int adaptationSetIndex;
   private final int[] representationIndices;
+  private final Map<UUID, byte[]> psshInfo;
 
   private MediaPresentationDescription currentManifest;
   private boolean finishedCurrentManifest;
@@ -180,6 +184,7 @@ private DashChunkSource(ManifestFetcher<MediaPresentationDescription> manifestFe
     this.evaluation = new Evaluation();
     this.headerBuilder = new StringBuilder();
 
+    psshInfo = getPsshInfo(currentManifest, adaptationSetIndex);
     Representation[] representations = getFilteredRepresentations(currentManifest,
         adaptationSetIndex, representationIndices);
     long periodDurationUs = (representations[0].periodDurationMs == TrackRenderer.UNKNOWN_TIME_US)
@@ -438,7 +443,7 @@ private Chunk newMediaChunk(RepresentationHolder representationHolder, DataSourc
           startTimeUs, endTimeUs, nextAbsoluteSegmentNum, null, representationHolder.vttHeader);
     } else {
       return new Mp4MediaChunk(dataSource, dataSpec, representation.format, trigger, startTimeUs,
-          endTimeUs, nextAbsoluteSegmentNum, representationHolder.extractor, null, false,
+          endTimeUs, nextAbsoluteSegmentNum, representationHolder.extractor, psshInfo, false,
           presentationTimeOffsetUs);
     }
   }
@@ -463,8 +468,8 @@ private long getLiveSeekPosition() {
 
   private static Representation[] getFilteredRepresentations(MediaPresentationDescription manifest,
       int adaptationSetIndex, int[] representationIndices) {
-    List<Representation> representations =
-        manifest.periods.get(0).adaptationSets.get(adaptationSetIndex).representations;
+    AdaptationSet adaptationSet = manifest.periods.get(0).adaptationSets.get(adaptationSetIndex);
+    List<Representation> representations = adaptationSet.representations;
     if (representationIndices == null) {
       Representation[] filteredRepresentations = new Representation[representations.size()];
       representations.toArray(filteredRepresentations);
@@ -478,6 +483,22 @@ private static Representation[] getFilteredRepresentations(MediaPresentationDesc
     }
   }
 
+  private static Map<UUID, byte[]> getPsshInfo(MediaPresentationDescription manifest,
+      int adaptationSetIndex) {
+    AdaptationSet adaptationSet = manifest.periods.get(0).adaptationSets.get(adaptationSetIndex);
+    if (adaptationSet.contentProtections.isEmpty()) {
+      return null;
+    } else {
+      Map<UUID, byte[]> psshInfo = new HashMap<UUID, byte[]>();
+      for (ContentProtection contentProtection : adaptationSet.contentProtections) {
+        if (contentProtection.uuid != null && contentProtection.data != null) {
+          psshInfo.put(contentProtection.uuid, contentProtection.data);
+        }
+      }
+      return psshInfo.isEmpty() ? null : psshInfo;
+    }
+  }
+
   private static MediaPresentationDescription buildManifest(List<Representation> representations) {
     Representation firstRepresentation = representations.get(0);
     AdaptationSet adaptationSet = new AdaptationSet(0, AdaptationSet.TYPE_UNKNOWN, representations);

library/src/main/java/com/google/android/exoplayer/dash/mpd/ContentProtection.java

@@ -15,6 +15,8 @@
  */
 package com.google.android.exoplayer.dash.mpd;
 
+import java.util.UUID;
+
 /**
  * Represents a ContentProtection tag in an AdaptationSet.
  */
@@ -25,11 +27,25 @@ public class ContentProtection {
    */
   public final String schemeUriId;
 
+  /**
+   * The UUID of the protection scheme. May be null.
+   */
+  public final UUID uuid;
+
+  /**
+   * Protection scheme specific data. May be null.
+   */
+  public final byte[] data;
+
   /**
    * @param schemeUriId Identifies the content protection scheme.
+   * @param uuid The UUID of the protection scheme, if known. May be null.
+   * @param data Protection scheme specific initialization data. May be null.
    */
-  public ContentProtection(String schemeUriId) {
+  public ContentProtection(String schemeUriId, UUID uuid, byte[] data) {
     this.schemeUriId = schemeUriId;
+    this.uuid = uuid;
+    this.data = data;
   }
 
 }

library/src/main/java/com/google/android/exoplayer/dash/mpd/MediaPresentationDescriptionParser.java

@@ -257,7 +257,7 @@ protected ContentProtection parseContentProtection(XmlPullParser xpp)
   }
 
   protected ContentProtection buildContentProtection(String schemeIdUri) {
-    return new ContentProtection(schemeIdUri);
+    return new ContentProtection(schemeIdUri, null, null);
   }
 
   /**