Fix handling of fetch errors for post-rolls

The ad break time in seconds from IMA was "-1" for postrolls, but this didn't
match C.TIME_END_OF_SOURCE in the ad group times array.

Handle an ad break time of -1 directly by mapping it onto the last ad group,
instead of trying to look it up in the array.

PiperOrigin-RevId: 312064886

extensions/ima/build.gradle

@@ -50,6 +50,7 @@ dependencies {
     androidTestImplementation 'com.android.support:multidex:1.0.3'
     androidTestCompileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
     testImplementation project(modulePrefix + 'testutils')
+    testImplementation 'com.google.guava:guava:' + guavaVersion
     testImplementation 'org.robolectric:robolectric:' + robolectricVersion
 }
 

extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java

@@ -1114,8 +1114,10 @@ public final class ImaAdsLoader
         }
         int adGroupTimeSeconds = Integer.parseInt(adGroupTimeSecondsString);
         int adGroupIndex =
-            Arrays.binarySearch(
-                adPlaybackState.adGroupTimesUs, C.MICROS_PER_SECOND * adGroupTimeSeconds);
+            adGroupTimeSeconds == -1
+                ? adPlaybackState.adGroupCount - 1
+                : Util.linearSearch(
+                    adPlaybackState.adGroupTimesUs, C.MICROS_PER_SECOND * adGroupTimeSeconds);
         AdPlaybackState.AdGroup adGroup = adPlaybackState.adGroups[adGroupIndex];
         if (adGroup.count == C.LENGTH_UNSET) {
           adPlaybackState =

extensions/ima/src/test/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoaderTest.java

@@ -56,6 +56,7 @@ import com.google.android.exoplayer2.source.ads.SinglePeriodAdTimeline;
 import com.google.android.exoplayer2.testutil.FakeTimeline;
 import com.google.android.exoplayer2.testutil.FakeTimeline.TimelineWindowDefinition;
 import com.google.android.exoplayer2.upstream.DataSpec;
+import com.google.common.collect.ImmutableMap;
 import java.io.IOException;
 import java.time.Duration;
 import java.util.ArrayList;
@@ -105,6 +106,7 @@ public final class ImaAdsLoaderTest {
   @Mock private ImaFactory mockImaFactory;
   @Mock private AdPodInfo mockAdPodInfo;
   @Mock private Ad mockPrerollSingleAd;
+  @Mock private AdEvent mockPostrollFetchErrorAdEvent;
 
   private ViewGroup adViewGroup;
   private View adOverlayView;
@@ -253,6 +255,23 @@ public final class ImaAdsLoaderTest {
   }
 
   @Test
+  public void playback_withPostrollFetchError_marksAdAsInErrorState() {
+    setupPlayback(CONTENT_TIMELINE, ADS_DURATIONS_US, new Float[] {-1f});
+
+    // Simulate loading an empty postroll ad.
+    imaAdsLoader.start(adsLoaderListener, adViewProvider);
+    imaAdsLoader.onAdEvent(mockPostrollFetchErrorAdEvent);
+
+    assertThat(adsLoaderListener.adPlaybackState)
+        .isEqualTo(
+            new AdPlaybackState(/* adGroupTimesUs...= */ C.TIME_END_OF_SOURCE)
+                .withContentDurationUs(CONTENT_PERIOD_DURATION_US)
+                .withAdDurationsUs(ADS_DURATIONS_US)
+                .withAdCount(/* adGroupIndex= */ 0, /* adCount= */ 1)
+                .withAdLoadError(/* adGroupIndex= */ 0, /* adIndexInAdGroup= */ 0));
+  }
+
+  @Test
   public void playback_withAdNotPreloadingBeforeTimeout_hasNoError() {
     // Simulate an ad at 2 seconds.
     long adGroupPositionInWindowUs = 2 * C.MICROS_PER_SECOND;
@@ -378,6 +397,10 @@ public final class ImaAdsLoaderTest {
     when(mockAdPodInfo.getAdPosition()).thenReturn(1);
 
     when(mockPrerollSingleAd.getAdPodInfo()).thenReturn(mockAdPodInfo);
+
+    when(mockPostrollFetchErrorAdEvent.getType()).thenReturn(AdEventType.AD_BREAK_FETCH_ERROR);
+    when(mockPostrollFetchErrorAdEvent.getAdData())
+        .thenReturn(ImmutableMap.of("adBreakTime", "-1"));
   }
 
   private static AdEvent getAdEvent(AdEventType adEventType, @Nullable Ad ad) {

library/common/src/main/java/com/google/android/exoplayer2/util/Util.java

@@ -768,6 +768,24 @@ public final class Util {
   }
 
   /**
+   * Returns the index of the first occurrence of {@code value} in {@code array}, or {@link
+   * C#INDEX_UNSET} if {@code value} is not contained in {@code array}.
+   *
+   * @param array The array to search.
+   * @param value The value to search for.
+   * @return The index of the first occurrence of value in {@code array}, or {@link C#INDEX_UNSET}
+   *     if {@code value} is not contained in {@code array}.
+   */
+  public static int linearSearch(long[] array, long value) {
+    for (int i = 0; i < array.length; i++) {
+      if (array[i] == value) {
+        return i;
+      }
+    }
+    return C.INDEX_UNSET;
+  }
+
+  /**
    * Returns the index of the largest element in {@code array} that is less than (or optionally
    * equal to) a specified {@code value}.
    *