Misc bugfixes.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=126175948

library/src/main/java/com/google/android/exoplayer/ExoPlayerImplInternal.java

@@ -284,10 +284,6 @@ import java.util.ArrayList;
     }
   }
 
-  private boolean isReadyOrEnded(TrackRenderer renderer) {
-    return renderer.isReady() || renderer.isEnded();
-  }
-
   private void setSourceProviderInternal(SampleSourceProvider sourceProvider) {
     try {
       resetInternal();
@@ -399,7 +395,7 @@ import java.util.ArrayList;
       allRenderersEnded = allRenderersEnded && renderer.isEnded();
       // Determine whether the renderer is ready (or ended). If it's not, throw an error that's
       // preventing the renderer from making progress, if such an error exists.
-      boolean rendererReadyOrEnded = isReadyOrEnded(renderer);
+      boolean rendererReadyOrEnded = renderer.isReady() || renderer.isEnded();
       if (!rendererReadyOrEnded) {
         renderer.maybeThrowStreamError();
       }

library/src/main/java/com/google/android/exoplayer/MultiSampleSource.java

@@ -107,13 +107,22 @@ public final class MultiSampleSource implements SampleSource, SampleSource.Callb
 
   @Override
   public long readDiscontinuity() {
-    for (SampleSource source : enabledSources) {
+    long positionUs = enabledSources[0].readDiscontinuity();
-      if (source.readDiscontinuity() != C.UNSET_TIME_US) {
+    if (positionUs != C.UNSET_TIME_US) {
-        // Children are not allowed to report discontinuities.
+      // It must be possible to seek additional sources to the new position.
+      for (int i = 1; i < enabledSources.length; i++) {
+        if (enabledSources[i].seekToUs(positionUs) != positionUs) {
+          throw new IllegalStateException("Children seeked to different positions");
+        }
+      }
+    }
+    // Additional sources are not allowed to report discontinuities.
+    for (int i = 1; i < enabledSources.length; i++) {
+      if (enabledSources[i].readDiscontinuity() != C.UNSET_TIME_US) {
         throw new IllegalStateException("Child reported discontinuity");
       }
     }
-    return C.UNSET_TIME_US;
+    return positionUs;
   }
 
   @Override
@@ -131,8 +140,8 @@ public final class MultiSampleSource implements SampleSource, SampleSource.Callb
   @Override
   public long seekToUs(long positionUs) {
     positionUs = enabledSources[0].seekToUs(positionUs);
-    for (int i = 1; i < enabledSources.length; i++) {
     // Additional sources must seek to the same position.
+    for (int i = 1; i < enabledSources.length; i++) {
       if (enabledSources[i].seekToUs(positionUs) != positionUs) {
         throw new IllegalStateException("Children seeked to different positions");
       }

library/src/main/java/com/google/android/exoplayer/extractor/ExtractorSampleSource.java

@@ -379,7 +379,10 @@ public final class ExtractorSampleSource implements SampleSource, ExtractorOutpu
         loadCondition.open();
       }
       if (seenFirstTrackSelection ? newStreams.length > 0 : positionUs != 0) {
-        seekToUs(positionUs);
+        long seekPositionUs = seekToUs(positionUs);
+        if (seekPositionUs != positionUs) {
+          notifyReset = true;
+        }
       }
     }
     seenFirstTrackSelection = true;
@@ -422,7 +425,6 @@ public final class ExtractorSampleSource implements SampleSource, ExtractorOutpu
     // Treat all seeks into non-seekable media as being to t=0.
     positionUs = seekMap.isSeekable() ? positionUs : 0;
     lastSeekPositionUs = positionUs;
-    notifyReset = true;
     // If we're not pending a reset, see if we can seek within the sample queues.
     boolean seekInsideBuffer = !isPendingReset();
     for (int i = 0; seekInsideBuffer && i < sampleQueues.length; i++) {
@@ -434,6 +436,7 @@ public final class ExtractorSampleSource implements SampleSource, ExtractorOutpu
     if (!seekInsideBuffer) {
       restartFrom(positionUs);
     }
+    notifyReset = false;
     return positionUs;
   }
 
@@ -455,7 +458,15 @@ public final class ExtractorSampleSource implements SampleSource, ExtractorOutpu
   }
 
   /* package */ void maybeThrowError() throws IOException {
-    loader.maybeThrowError();
+    int minRetryCount = minLoadableRetryCount;
+    if (minRetryCount == MIN_RETRY_COUNT_DEFAULT_FOR_MEDIA) {
+      // We assume on-demand before we're prepared.
+      minRetryCount = !prepared || length != C.LENGTH_UNBOUNDED
+          || (seekMap != null && seekMap.getDurationUs() != C.UNSET_TIME_US)
+          ? DEFAULT_MIN_LOADABLE_RETRY_COUNT_ON_DEMAND
+          : DEFAULT_MIN_LOADABLE_RETRY_COUNT_LIVE;
+    }
+    loader.maybeThrowError(minRetryCount);
   }
 
   /* package */ int readData(int track, FormatHolder formatHolder, DecoderInputBuffer buffer) {
@@ -591,16 +602,7 @@ public final class ExtractorSampleSource implements SampleSource, ExtractorOutpu
       pendingResetPositionUs = C.UNSET_TIME_US;
     }
     extractedSamplesCountAtStartOfLoad = getExtractedSamplesCount();
-
+    loader.startLoading(loadable, this, 0);
-    int minRetryCount = minLoadableRetryCount;
-    if (minRetryCount == MIN_RETRY_COUNT_DEFAULT_FOR_MEDIA) {
-      // We assume on-demand before we're prepared.
-      minRetryCount = !prepared || (length != C.LENGTH_UNBOUNDED
-          || (seekMap != null && seekMap.getDurationUs() != C.UNSET_TIME_US))
-          ? DEFAULT_MIN_LOADABLE_RETRY_COUNT_ON_DEMAND
-          : DEFAULT_MIN_LOADABLE_RETRY_COUNT_LIVE;
-    }
-    loader.startLoading(loadable, this, minRetryCount);
   }
 
   private void configureRetry(ExtractingLoadable loadable) {

library/src/main/java/com/google/android/exoplayer/upstream/Loader.java

@@ -154,17 +154,17 @@ public final class Loader {
    *
    * @param loadable The {@link Loadable} to load.
    * @param callback A callback to invoke when the load ends.
-   * @param minRetryCount The minimum number of times the load must be retried before
+   * @param defaultMinRetryCount The minimum number of times the load must be retried before
    *     {@link #maybeThrowError()} will propagate an error.
    * @throws IllegalStateException If the calling thread does not have an associated {@link Looper}.
    * @return {@link SystemClock#elapsedRealtime} when the load started.
    */
   public <T extends Loadable> long startLoading(T loadable, Callback<T> callback,
-      int minRetryCount) {
+      int defaultMinRetryCount) {
     Looper looper = Looper.myLooper();
     Assertions.checkState(looper != null);
     long startTimeMs = SystemClock.elapsedRealtime();
-    new LoadTask<>(looper, loadable, callback, minRetryCount, startTimeMs).start(0);
+    new LoadTask<>(looper, loadable, callback, defaultMinRetryCount, startTimeMs).start(0);
     return startTimeMs;
   }
 
@@ -179,16 +179,29 @@ public final class Loader {
 
   /**
    * If a fatal error has been encountered, or if the current {@link Loadable} has incurred a number
-   * of errors greater than its minimum number of retries and if the load is currently backed off,
+   * of errors greater than its default minimum number of retries and if the load is currently
-   * then an error is thrown. Else does nothing.
+   * backed off, then an error is thrown. Else does nothing.
    *
    * @throws IOException The error.
    */
   public void maybeThrowError() throws IOException {
+    maybeThrowError(Integer.MIN_VALUE);
+  }
+
+  /**
+   * If a fatal error has been encountered, or if the current {@link Loadable} has incurred a number
+   * of errors greater than the specified minimum number of retries and if the load is currently
+   * backed off, then an error is thrown. Else does nothing.
+   *
+   * @param minRetryCount A minimum retry count that must be exceeded.
+   * @throws IOException The error.
+   */
+  public void maybeThrowError(int minRetryCount) throws IOException {
     if (fatalError != null) {
       throw fatalError;
     } else if (currentTask != null) {
-      currentTask.maybeThrowError();
+      currentTask.maybeThrowError(minRetryCount == Integer.MIN_VALUE
+          ? currentTask.defaultMinRetryCount : minRetryCount);
     }
   }
 
@@ -220,7 +233,7 @@ public final class Loader {
 
     private final T loadable;
     private final Loader.Callback<T> callback;
-    private final int minRetryCount;
+    public final int defaultMinRetryCount;
     private final long startTimeMs;
 
     private IOException currentError;
@@ -229,16 +242,16 @@ public final class Loader {
     private volatile Thread executorThread;
     private volatile boolean released;
 
-    public LoadTask(Looper looper, T loadable, Loader.Callback<T> callback, int minRetryCount,
+    public LoadTask(Looper looper, T loadable, Loader.Callback<T> callback,
-        long startTimeMs) {
+        int defaultMinRetryCount, long startTimeMs) {
       super(looper);
       this.loadable = loadable;
       this.callback = callback;
-      this.minRetryCount = minRetryCount;
+      this.defaultMinRetryCount = defaultMinRetryCount;
       this.startTimeMs = startTimeMs;
     }
 
-    public void maybeThrowError() throws IOException {
+    public void maybeThrowError(int minRetryCount) throws IOException {
       if (currentError != null && errorCount > minRetryCount) {
         throw currentError;
       }