Do not throw in resolveSeekPosition on playback thread.

We currently throw if a pending seek position was valid when the user issued
it on the app thread, but can't be resolved on the playback thread because the
timeline changed in the meantime. Throwing in this case seems wrong as the
user could not have known about the issue (and the seek position was actually
valid). Also, in other cases where the currently playing period is no longer
in the new timeline, we gracefully use a subsequent period or transition to
ENDED state instead of throwing. So it seems more consistent to transition to
ENDED state as well.

PiperOrigin-RevId: 236274862

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java

@@ -1268,20 +1268,8 @@ import java.util.concurrent.atomic.AtomicBoolean;
       playbackInfoUpdate.incrementPendingOperationAcks(pendingPrepareCount);
       pendingPrepareCount = 0;
       if (pendingInitialSeekPosition != null) {
-        Pair<Object, Long> periodPosition;
-        try {
-          periodPosition =
-              resolveSeekPosition(pendingInitialSeekPosition, /* trySubsequentPeriods= */ true);
-        } catch (IllegalSeekPositionException e) {
-          MediaPeriodId firstMediaPeriodId =
-              playbackInfo.getDummyFirstMediaPeriodId(shuffleModeEnabled, window);
-          playbackInfo =
-              playbackInfo.resetToNewPosition(
-                  firstMediaPeriodId,
-                  /* startPositionUs= */ C.TIME_UNSET,
-                  /* contentPositionUs= */ C.TIME_UNSET);
-          throw e;
-        }
+        Pair<Object, Long> periodPosition =
+            resolveSeekPosition(pendingInitialSeekPosition, /* trySubsequentPeriods= */ true);
         pendingInitialSeekPosition = null;
         if (periodPosition == null) {
           // The seek position was valid for the timeline that it was performed into, but the
@@ -1481,8 +1469,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
           seekPosition.windowPositionUs);
     } catch (IndexOutOfBoundsException e) {
       // The window index of the seek position was outside the bounds of the timeline.
-      throw new IllegalSeekPositionException(
-          timeline, seekPosition.windowIndex, C.usToMs(seekPosition.windowPositionUs));
+      return null;
     }
     if (timeline == seekTimeline) {
       // Our internal timeline is the seek timeline, so the mapped position is correct.

library/core/src/test/java/com/google/android/exoplayer2/ExoPlayerTest.java

@@ -549,12 +549,9 @@ public final class ExoPlayerTest {
     ActionSchedule actionSchedule =
         new ActionSchedule.Builder("testSeekProcessedCalledWithIllegalSeekPosition")
             .waitForPlaybackState(Player.STATE_BUFFERING)
-            // Cause an illegal seek exception by seeking to an invalid position while the media
-            // source is still being prepared and the player doesn't immediately know it will fail.
-            // Because the media source prepares immediately, the exception will be thrown when the
-            // player processed the seek.
+            // The illegal seek position will end playback.
             .seek(/* windowIndex= */ 100, /* positionMs= */ 0)
-            .waitForPlaybackState(Player.STATE_IDLE)
+            .waitForPlaybackState(Player.STATE_ENDED)
             .build();
     final boolean[] onSeekProcessedCalled = new boolean[1];
     EventListener listener =
@@ -566,13 +563,7 @@ public final class ExoPlayerTest {
         };
     ExoPlayerTestRunner testRunner =
         new Builder().setActionSchedule(actionSchedule).setEventListener(listener).build(context);
-    try {
-      testRunner.start().blockUntilActionScheduleFinished(TIMEOUT_MS).blockUntilEnded(TIMEOUT_MS);
-      fail();
-    } catch (ExoPlaybackException e) {
-      // Expected exception.
-      assertThat(e.getUnexpectedException()).isInstanceOf(IllegalSeekPositionException.class);
-    }
+    testRunner.start().blockUntilActionScheduleFinished(TIMEOUT_MS).blockUntilEnded(TIMEOUT_MS);
     assertThat(onSeekProcessedCalled[0]).isTrue();
   }
 
@@ -1295,59 +1286,51 @@ public final class ExoPlayerTest {
   }
 
   @Test
-  public void testPlaybackErrorDuringSourceInfoRefreshStillUpdatesTimeline() throws Exception {
+  public void testInvalidSeekPositionAfterSourceInfoRefreshStillUpdatesTimeline() throws Exception {
     final Timeline timeline = new FakeTimeline(/* windowCount= */ 1);
     final FakeMediaSource mediaSource =
         new FakeMediaSource(/* timeline= */ null, /* manifest= */ null);
     ActionSchedule actionSchedule =
-        new ActionSchedule.Builder("testPlaybackErrorDuringSourceInfoRefreshStillUpdatesTimeline")
+        new ActionSchedule.Builder("testInvalidSeekPositionSourceInfoRefreshStillUpdatesTimeline")
             .waitForPlaybackState(Player.STATE_BUFFERING)
-            // Cause an internal exception by seeking to an invalid position while the media source
-            // is still being prepared. The error will be thrown while the player handles the new
-            // source info.
+            // Seeking to an invalid position will end playback.
             .seek(/* windowIndex= */ 100, /* positionMs= */ 0)
             .executeRunnable(() -> mediaSource.setNewSourceInfo(timeline, /* newManifest= */ null))
-            .waitForPlaybackState(Player.STATE_IDLE)
+            .waitForPlaybackState(Player.STATE_ENDED)
             .build();
     ExoPlayerTestRunner testRunner =
         new ExoPlayerTestRunner.Builder()
             .setMediaSource(mediaSource)
             .setActionSchedule(actionSchedule)
             .build(context);
-    try {
-      testRunner.start().blockUntilActionScheduleFinished(TIMEOUT_MS).blockUntilEnded(TIMEOUT_MS);
-      fail();
-    } catch (ExoPlaybackException e) {
-      // Expected exception.
-      assertThat(e.getUnexpectedException()).isInstanceOf(IllegalSeekPositionException.class);
-    }
+    testRunner.start().blockUntilActionScheduleFinished(TIMEOUT_MS).blockUntilEnded(TIMEOUT_MS);
+
     testRunner.assertTimelinesEqual(timeline);
     testRunner.assertTimelineChangeReasonsEqual(Player.TIMELINE_CHANGE_REASON_PREPARED);
   }
 
   @Test
-  public void testPlaybackErrorDuringSourceInfoRefreshWithShuffleModeEnabledUsesCorrectFirstPeriod()
-      throws Exception {
+  public void
+      testInvalidSeekPositionAfterSourceInfoRefreshWithShuffleModeEnabledUsesCorrectFirstPeriod()
+          throws Exception {
     FakeMediaSource mediaSource =
         new FakeMediaSource(new FakeTimeline(/* windowCount= */ 1), /* manifest= */ null);
     ConcatenatingMediaSource concatenatingMediaSource =
         new ConcatenatingMediaSource(
             /* isAtomic= */ false, new FakeShuffleOrder(0), mediaSource, mediaSource);
-    AtomicInteger windowIndexAfterError = new AtomicInteger();
+    AtomicInteger windowIndexAfterUpdate = new AtomicInteger();
     ActionSchedule actionSchedule =
-        new ActionSchedule.Builder("testPlaybackErrorDuringSourceInfoRefreshUsesCorrectFirstPeriod")
+        new ActionSchedule.Builder("testInvalidSeekPositionSourceInfoRefreshUsesCorrectFirstPeriod")
             .setShuffleModeEnabled(true)
             .waitForPlaybackState(Player.STATE_BUFFERING)
-            // Cause an internal exception by seeking to an invalid position while the media source
-            // is still being prepared. The error will be thrown while the player handles the new
-            // source info.
+            // Seeking to an invalid position will end playback.
             .seek(/* windowIndex= */ 100, /* positionMs= */ 0)
-            .waitForPlaybackState(Player.STATE_IDLE)
+            .waitForPlaybackState(Player.STATE_ENDED)
             .executeRunnable(
                 new PlayerRunnable() {
                   @Override
                   public void run(SimpleExoPlayer player) {
-                    windowIndexAfterError.set(player.getCurrentWindowIndex());
+                    windowIndexAfterUpdate.set(player.getCurrentWindowIndex());
                   }
                 })
             .build();
@@ -1356,14 +1339,9 @@ public final class ExoPlayerTest {
             .setMediaSource(concatenatingMediaSource)
             .setActionSchedule(actionSchedule)
             .build(context);
-    try {
-      testRunner.start().blockUntilActionScheduleFinished(TIMEOUT_MS).blockUntilEnded(TIMEOUT_MS);
-      fail();
-    } catch (ExoPlaybackException e) {
-      // Expected exception.
-      assertThat(e.getUnexpectedException()).isInstanceOf(IllegalSeekPositionException.class);
-    }
-    assertThat(windowIndexAfterError.get()).isEqualTo(1);
+    testRunner.start().blockUntilActionScheduleFinished(TIMEOUT_MS).blockUntilEnded(TIMEOUT_MS);
+
+    assertThat(windowIndexAfterUpdate.get()).isEqualTo(1);
   }
 
   @Test