Decrease polling rate for IMA Video Ads from 100ms to 200ms

PiperOrigin-RevId: 438634901

RELEASENOTES.md

@@ -19,6 +19,9 @@
     *   Rename `DummySurface` to `PlaceHolderSurface`.
 *   Audio:
     *   Use LG AC3 audio decoder advertising non-standard MIME type.
+*   Ad playback / IMA:
+    *   Decrease ad polling rate from every 100ms to every 200ms, to line up with
+        Media Rating Council (MRC) recommendations.
 *   Extractors:
     *   Matroska: Parse `DiscardPadding` for Opus tracks.
 *   UI:

libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/AdTagLoader.java

@@ -84,12 +84,14 @@ import java.util.Map;
   private static final String IMA_SDK_SETTINGS_PLAYER_VERSION = MediaLibraryInfo.VERSION;
 
   /**
-   * Interval at which ad progress updates are provided to the IMA SDK, in milliseconds. 100 ms is
-   * the interval recommended by the IMA documentation.
+   * Interval at which ad progress updates are provided to the IMA SDK, in milliseconds. 200 ms is
+   * the interval recommended by the Media Rating Council (MRC) for minimum polling of viewable
+   * video impressions.
+   * http://www.mediaratingcouncil.org/063014%20Viewable%20Ad%20Impression%20Guideline_Final.pdf.
    *
    * @see VideoAdPlayer.VideoAdPlayerCallback
    */
-  private static final int AD_PROGRESS_UPDATE_INTERVAL_MS = 100;
+  private static final int AD_PROGRESS_UPDATE_INTERVAL_MS = 200;
 
   /** The value used in {@link VideoProgressUpdate}s to indicate an unset duration. */
   private static final long IMA_DURATION_UNSET = -1L;