Pull IMA cuePoints -> adGroupTimesUs logic into a helper class

We're then able to use this same helper class from tests, to avoid
running into spurious failures caused by long microseconds being
round-tripped through float seconds.

PiperOrigin-RevId: 316435084

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

+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.exoplayer2.ext.ima;
+
+import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.source.ads.AdPlaybackState;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Static utility class for constructing {@link AdPlaybackState} instances from IMA-specific data.
+ */
+/* package */ final class AdPlaybackStateFactory {
+  private AdPlaybackStateFactory() {}
+
+  /**
+   * Construct an {@link AdPlaybackState} from the provided {@code cuePoints}.
+   *
+   * @param cuePoints The cue points of the ads in seconds.
+   * @return The {@link AdPlaybackState}.
+   */
+  public static AdPlaybackState fromCuePoints(List<Float> cuePoints) {
+    if (cuePoints.isEmpty()) {
+      // If no cue points are specified, there is a preroll ad.
+      return new AdPlaybackState(/* adGroupTimesUs...= */ 0);
+    }
+
+    int count = cuePoints.size();
+    long[] adGroupTimesUs = new long[count];
+    int adGroupIndex = 0;
+    for (int i = 0; i < count; i++) {
+      double cuePoint = cuePoints.get(i);
+      if (cuePoint == -1.0) {
+        adGroupTimesUs[count - 1] = C.TIME_END_OF_SOURCE;
+      } else {
+        adGroupTimesUs[adGroupIndex++] = (long) (C.MICROS_PER_SECOND * cuePoint);
+      }
+    }
+    // Cue points may be out of order, so sort them.
+    Arrays.sort(adGroupTimesUs, 0, adGroupIndex);
+    return new AdPlaybackState(adGroupTimesUs);
+  }
+}

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

@@ -662,7 +662,7 @@ public final class ImaAdsLoader
         adsManager.resume();
       }
     } else if (adsManager != null) {
-      adPlaybackState = new AdPlaybackState(getAdGroupTimesUs(adsManager.getAdCuePoints()));
+      adPlaybackState = AdPlaybackStateFactory.fromCuePoints(adsManager.getAdCuePoints());
       updateAdPlaybackState();
     } else {
       // Ads haven't loaded yet, so request them.
@@ -739,7 +739,7 @@ public final class ImaAdsLoader
     if (player != null) {
       // If a player is attached already, start playback immediately.
       try {
-        adPlaybackState = new AdPlaybackState(getAdGroupTimesUs(adsManager.getAdCuePoints()));
+        adPlaybackState = AdPlaybackStateFactory.fromCuePoints(adsManager.getAdCuePoints());
         hasAdPlaybackState = true;
         updateAdPlaybackState();
       } catch (RuntimeException e) {
@@ -1554,28 +1554,6 @@ public final class ImaAdsLoader
             : timeline.getPeriod(/* periodIndex= */ 0, period).getPositionInWindowMs());
   }
 
-  private static long[] getAdGroupTimesUs(List<Float> cuePoints) {
-    if (cuePoints.isEmpty()) {
-      // If no cue points are specified, there is a preroll ad.
-      return new long[] {0};
-    }
-
-    int count = cuePoints.size();
-    long[] adGroupTimesUs = new long[count];
-    int adGroupIndex = 0;
-    for (int i = 0; i < count; i++) {
-      double cuePoint = cuePoints.get(i);
-      if (cuePoint == -1.0) {
-        adGroupTimesUs[count - 1] = C.TIME_END_OF_SOURCE;
-      } else {
-        adGroupTimesUs[adGroupIndex++] = (long) (C.MICROS_PER_SECOND * cuePoint);
-      }
-    }
-    // Cue points may be out of order, so sort them.
-    Arrays.sort(adGroupTimesUs, 0, adGroupIndex);
-    return adGroupTimesUs;
-  }
-
   private static boolean isAdGroupLoadError(AdError adError) {
     // TODO: Find out what other errors need to be handled (if any), and whether each one relates to
     // a single ad, ad group or the whole timeline.