Rework application of Mpd.Location + fix test.

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

@@ -298,10 +298,6 @@ public class DashChunkSource implements ChunkSource {
 
     if (finishedCurrentManifest && (android.os.SystemClock.elapsedRealtime()
         > manifestFetcher.getManifestLoadTimestamp() + minUpdatePeriod)) {
-      String newManifestURL = currentManifest.location;
-      if (newManifestURL != null) {
-          manifestFetcher.updateManifestUrl(newManifestURL);
-      }
       manifestFetcher.requestRefresh();
     }
   }
@@ -592,8 +588,8 @@ public class DashChunkSource implements ChunkSource {
     Period period = new Period(null, firstRepresentation.periodStartMs,
         firstRepresentation.periodDurationMs, Collections.singletonList(adaptationSet));
     long duration = firstRepresentation.periodDurationMs - firstRepresentation.periodStartMs;
-    return new MediaPresentationDescription(-1, duration, -1, false, -1, -1, null,
-        Collections.singletonList(period), null);
+    return new MediaPresentationDescription(-1, duration, -1, false, -1, -1, null, null,
+        Collections.singletonList(period));
   }
 
   private static class RepresentationHolder {

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

@@ -15,13 +15,15 @@
  */
 package com.google.android.exoplayer.dash.mpd;
 
+import com.google.android.exoplayer.util.ManifestFetcher.RedirectingManifest;
+
 import java.util.Collections;
 import java.util.List;
 
 /**
  * Represents a DASH media presentation description (mpd).
  */
-public class MediaPresentationDescription {
+public class MediaPresentationDescription implements RedirectingManifest {
 
   public final long availabilityStartTime;
 
@@ -35,15 +37,15 @@ public class MediaPresentationDescription {
 
   public final long timeShiftBufferDepth;
 
-  public final List<Period> periods;
-
   public final UtcTimingElement utcTiming;
 
   public final String location;
 
+  public final List<Period> periods;
+
   public MediaPresentationDescription(long availabilityStartTime, long duration, long minBufferTime,
       boolean dynamic, long minUpdatePeriod, long timeShiftBufferDepth, UtcTimingElement utcTiming,
-      List<Period> periods, String location) {
+      String location, List<Period> periods) {
     this.availabilityStartTime = availabilityStartTime;
     this.duration = duration;
     this.minBufferTime = minBufferTime;
@@ -51,8 +53,13 @@ public class MediaPresentationDescription {
     this.minUpdatePeriod = minUpdatePeriod;
     this.timeShiftBufferDepth = timeShiftBufferDepth;
     this.utcTiming = utcTiming;
-    this.periods = Collections.unmodifiableList(periods);
     this.location = location;
+    this.periods = Collections.unmodifiableList(periods);
+  }
+
+  @Override
+  public String getNextManifestUrl() {
+    return location;
   }
 
 }

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

@@ -128,15 +128,15 @@ public class MediaPresentationDescriptionParser extends DefaultHandler
     } while (!isEndTag(xpp, "MPD"));
 
     return buildMediaPresentationDescription(availabilityStartTime, durationMs, minBufferTimeMs,
-        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, utcTiming, periods, location);
+        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, utcTiming, location, periods);
   }
 
   protected MediaPresentationDescription buildMediaPresentationDescription(
       long availabilityStartTime, long durationMs, long minBufferTimeMs, boolean dynamic,
       long minUpdateTimeMs, long timeShiftBufferDepthMs, UtcTimingElement utcTiming,
-      List<Period> periods, String location) {
+      String location, List<Period> periods) {
     return new MediaPresentationDescription(availabilityStartTime, durationMs, minBufferTimeMs,
-        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, utcTiming, periods, location);
+        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, utcTiming, location, periods);
   }
 
   protected UtcTimingElement parseUtcTiming(XmlPullParser xpp) {

library/src/main/java/com/google/android/exoplayer/util/ManifestFetcher.java

@@ -23,6 +23,7 @@ import com.google.android.exoplayer.upstream.UriLoadable;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.SystemClock;
+import android.text.TextUtils;
 import android.util.Pair;
 
 import java.io.IOException;
@@ -83,6 +84,20 @@ public class ManifestFetcher<T> implements Loader.Callback {
 
   }
 
+  /**
+   * Interface for manifests that are able to specify that subsequent loads should use a different
+   * URL.
+   */
+  public interface RedirectingManifest {
+
+    /**
+     * Returns the URL from which subsequent manifests should be requested, or null to continue
+     * using the current URL.
+     */
+    public String getNextManifestUrl();
+
+  }
+
   private final UriLoadable.Parser<T> parser;
   private final UriDataSource uriDataSource;
   private final Handler eventHandler;
@@ -237,6 +252,14 @@ public class ManifestFetcher<T> implements Loader.Callback {
     loadExceptionCount = 0;
     loadException = null;
 
+    if (manifest instanceof RedirectingManifest) {
+      RedirectingManifest redirectingManifest = (RedirectingManifest) manifest;
+      String nextLocation = redirectingManifest.getNextManifestUrl();
+      if (!TextUtils.isEmpty(nextLocation)) {
+        manifestUrl = nextLocation;
+      }
+    }
+
     notifyManifestRefreshed();
   }
 

library/src/test/java/com/google/android/exoplayer/dash/DashChunkSourceTest.java

@@ -248,7 +248,7 @@ public class DashChunkSourceTest extends InstrumentationTestCase {
     long duration = (live) ? TrackRenderer.UNKNOWN_TIME_US
         : firstRepresentation.periodDurationMs - firstRepresentation.periodStartMs;
     return new MediaPresentationDescription(AVAILABILITY_START_TIME, duration, -1, live, -1, -1,
-        null, Collections.singletonList(period));
+        null, null, Collections.singletonList(period));
   }
 
   private static MediaPresentationDescription generateVodMpd() {