From 530c868c1762b5bee4b308bc37ad3ba176ddec27 Mon Sep 17 00:00:00 2001
From: tonihei <tonihei@google.com>
Date: Thu, 3 Feb 2022 10:09:42 +0000
Subject: [PATCH] Ignore format changes arriving after the media has been
 removed.

PiperOrigin-RevId: 426089165
---
 .../media3/exoplayer/analytics/MediaMetricsListener.java     | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/analytics/MediaMetricsListener.java b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/analytics/MediaMetricsListener.java
index 69f9f0ac4f..419e168b5c 100644
--- a/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/analytics/MediaMetricsListener.java
+++ b/libraries/exoplayer/src/main/java/androidx/media3/exoplayer/analytics/MediaMetricsListener.java
@@ -239,6 +239,11 @@ public final class MediaMetricsListener
 
   @Override
   public void onDownstreamFormatChanged(EventTime eventTime, MediaLoadData mediaLoadData) {
+    if (eventTime.mediaPeriodId == null) {
+      // This event arrived after the media has been removed from the playlist or a custom
+      // MediaSource forgot to set the right id. Ignore the track change in these cases.
+      return;
+    }
     PendingFormatUpdate update =
         new PendingFormatUpdate(
             checkNotNull(mediaLoadData.trackFormat),