Fix period transition with non-zero start position.

Period transitions with non-zero start position happen too early as the
playing period is advanced as soon as the renderer offset is reached not
taking into account that the start position needs to be added to that.

Issue:#4583

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=206310328

RELEASENOTES.md

@@ -77,6 +77,8 @@
   `MediaCodecRenderer`, and provide an (optional) `MediaCodecSelector` that
   falls back to less preferred decoders like `MediaCodec.createDecoderByType`
   ([#273](https://github.com/google/ExoPlayer/issues/273)).
+* Fix where transitions to clipped media sources happened too early
+  ([#4583](https://github.com/google/ExoPlayer/issues/4583)).
 
 ### 2.8.3 ###
 

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

@@ -1403,8 +1403,9 @@ import java.util.Collections;
     MediaPeriodHolder playingPeriodHolder = queue.getPlayingPeriod();
     MediaPeriodHolder readingPeriodHolder = queue.getReadingPeriod();
     boolean advancedPlayingPeriod = false;
-    while (playWhenReady && playingPeriodHolder != readingPeriodHolder
-        && rendererPositionUs >= playingPeriodHolder.next.rendererPositionOffsetUs) {
+    while (playWhenReady
+        && playingPeriodHolder != readingPeriodHolder
+        && rendererPositionUs >= playingPeriodHolder.next.getStartPositionRendererTime()) {
       // All enabled renderers' streams have been read to the end, and the playback position reached
       // the end of the playing period, so advance playback to the next period.
       if (advancedPlayingPeriod) {

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

@@ -39,7 +39,6 @@ import com.google.android.exoplayer2.util.Assertions;
   public final SampleStream[] sampleStreams;
   public final boolean[] mayRetainStreamFlags;
 
-  public long rendererPositionOffsetUs;
   public boolean prepared;
   public boolean hasEnabledTracks;
   public MediaPeriodInfo info;
@@ -51,6 +50,7 @@ import com.google.android.exoplayer2.util.Assertions;
   private final TrackSelector trackSelector;
   private final MediaSource mediaSource;
 
+  private long rendererPositionOffsetUs;
   private TrackSelectorResult periodTrackSelectorResult;
 
   /**
@@ -105,6 +105,10 @@ import com.google.android.exoplayer2.util.Assertions;
     return rendererPositionOffsetUs;
   }
 
+  public long getStartPositionRendererTime() {
+    return info.startPositionUs + rendererPositionOffsetUs;
+  }
+
   public boolean isFullyBuffered() {
     return prepared
         && (!hasEnabledTracks || mediaPeriod.getBufferedPositionUs() == C.TIME_END_OF_SOURCE);

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

@@ -20,8 +20,10 @@ import static org.junit.Assert.fail;
 
 import android.support.annotation.Nullable;
 import android.view.Surface;
+import com.google.android.exoplayer2.Player.DiscontinuityReason;
 import com.google.android.exoplayer2.Player.EventListener;
 import com.google.android.exoplayer2.Timeline.Window;
+import com.google.android.exoplayer2.source.ClippingMediaSource;
 import com.google.android.exoplayer2.source.ConcatenatingMediaSource;
 import com.google.android.exoplayer2.source.MediaSource;
 import com.google.android.exoplayer2.source.MediaSource.MediaPeriodId;
@@ -32,6 +34,7 @@ import com.google.android.exoplayer2.source.ads.AdPlaybackState;
 import com.google.android.exoplayer2.testutil.ActionSchedule;
 import com.google.android.exoplayer2.testutil.ActionSchedule.PlayerRunnable;
 import com.google.android.exoplayer2.testutil.ActionSchedule.PlayerTarget;
+import com.google.android.exoplayer2.testutil.AutoAdvancingFakeClock;
 import com.google.android.exoplayer2.testutil.ExoPlayerTestRunner;
 import com.google.android.exoplayer2.testutil.ExoPlayerTestRunner.Builder;
 import com.google.android.exoplayer2.testutil.FakeMediaClockRenderer;
@@ -46,6 +49,7 @@ import com.google.android.exoplayer2.testutil.FakeTrackSelector;
 import com.google.android.exoplayer2.testutil.RobolectricUtil;
 import com.google.android.exoplayer2.upstream.Allocator;
 import com.google.android.exoplayer2.upstream.TransferListener;
+import com.google.android.exoplayer2.util.Clock;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -2211,6 +2215,69 @@ public final class ExoPlayerTest {
     assertThat(eventListenerPlayWhenReady).containsExactly(true, true, true, false).inOrder();
   }
 
+  @Test
+  public void testClippedLoopedPeriodsArePlayedFully() throws Exception {
+    long startPositionUs = 300_000;
+    long expectedDurationUs = 700_000;
+    MediaSource mediaSource =
+        new ClippingMediaSource(
+            new FakeMediaSource(new FakeTimeline(/* windowCount= */ 1), /* manifest= */ null),
+            startPositionUs,
+            startPositionUs + expectedDurationUs);
+    Clock clock = new AutoAdvancingFakeClock();
+    AtomicReference<Player> playerReference = new AtomicReference<>();
+    AtomicReference<Long> positionAtDiscontinuityMs = new AtomicReference<>();
+    AtomicReference<Long> clockAtStartMs = new AtomicReference<>();
+    AtomicReference<Long> clockAtDiscontinuityMs = new AtomicReference<>();
+    EventListener eventListener =
+        new EventListener() {
+          @Override
+          public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
+            if (playbackState == Player.STATE_READY && clockAtStartMs.get() == null) {
+              clockAtStartMs.set(clock.elapsedRealtime());
+            }
+          }
+
+          @Override
+          public void onPositionDiscontinuity(@DiscontinuityReason int reason) {
+            if (reason == Player.DISCONTINUITY_REASON_PERIOD_TRANSITION) {
+              positionAtDiscontinuityMs.set(playerReference.get().getCurrentPosition());
+              clockAtDiscontinuityMs.set(clock.elapsedRealtime());
+            }
+          }
+        };
+    ActionSchedule actionSchedule =
+        new ActionSchedule.Builder("testClippedLoopedPeriodsArePlayedFully")
+            .executeRunnable(
+                new PlayerRunnable() {
+                  @Override
+                  public void run(SimpleExoPlayer player) {
+                    playerReference.set(player);
+                    player.addListener(eventListener);
+                  }
+                })
+            .pause()
+            .setRepeatMode(Player.REPEAT_MODE_ALL)
+            .waitForPlaybackState(Player.STATE_READY)
+            // Play until the media repeats once.
+            .playUntilPosition(/* windowIndex= */ 0, /* positionMs= */ 1)
+            .playUntilStartOfWindow(/* windowIndex= */ 0)
+            .setRepeatMode(Player.REPEAT_MODE_OFF)
+            .play()
+            .build();
+    new ExoPlayerTestRunner.Builder()
+        .setClock(clock)
+        .setMediaSource(mediaSource)
+        .setActionSchedule(actionSchedule)
+        .build()
+        .start()
+        .blockUntilEnded(TIMEOUT_MS);
+
+    assertThat(positionAtDiscontinuityMs.get()).isAtLeast(0L);
+    assertThat(clockAtDiscontinuityMs.get() - clockAtStartMs.get())
+        .isAtLeast(C.usToMs(expectedDurationUs));
+  }
+
   // Internal methods.
 
   private static ActionSchedule.Builder addSurfaceSwitch(ActionSchedule.Builder builder) {