From e342b70e93b0ca6135f94e66b5baf94877f7683f Mon Sep 17 00:00:00 2001
From: ibaker <ibaker@google.com>
Date: Fri, 2 Dec 2022 15:29:19 +0000
Subject: [PATCH] Fix `TextRenderer` exception when a subtitle file contains no
 cues

Discovered while investigating Issue: google/ExoPlayer#10823

Example stack trace with the previous code (I added the index value for
debugging):

```
playerFailed [eventTime=44.07, mediaPos=44.01, window=0, period=0, errorCode=ERROR_CODE_FAILED_RUNTIME_CHECK
  androidx.media3.exoplayer.ExoPlaybackException: Unexpected runtime error
      at androidx.media3.exoplayer.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:635)
      at android.os.Handler.dispatchMessage(Handler.java:102)
      at android.os.Looper.loopOnce(Looper.java:202)
      at android.os.Looper.loop(Looper.java:291)
      at android.os.HandlerThread.run(HandlerThread.java:67)
  Caused by: java.lang.IllegalArgumentException: index=-1
      at androidx.media3.common.util.Assertions.checkArgument(Assertions.java:55)
      at androidx.media3.extractor.text.webvtt.WebvttSubtitle.getEventTime(WebvttSubtitle.java:62)
      at androidx.media3.extractor.text.SubtitleOutputBuffer.getEventTime(SubtitleOutputBuffer.java:56)
      at androidx.media3.exoplayer.text.TextRenderer.getCurrentEventTimeUs(TextRenderer.java:435)
      at androidx.media3.exoplayer.text.TextRenderer.render(TextRenderer.java:268)
      at androidx.media3.exoplayer.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:1008)
      at androidx.media3.exoplayer.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:509)
      at android.os.Handler.dispatchMessage(Handler.java:102)
      at android.os.Looper.loopOnce(Looper.java:202)
      at android.os.Looper.loop(Looper.java:291)
      at android.os.HandlerThread.run(HandlerThread.java:67)
]
```

#minor-release

PiperOrigin-RevId: 492464180
(cherry picked from commit 5f6fde4d2a90d78a8d58430c88d7dc12849fe163)
---
 .../java/com/google/android/exoplayer2/text/TextRenderer.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/core/src/main/java/com/google/android/exoplayer2/text/TextRenderer.java b/library/core/src/main/java/com/google/android/exoplayer2/text/TextRenderer.java
index 58ead180c9..862463d33b 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/text/TextRenderer.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/text/TextRenderer.java
@@ -418,7 +418,7 @@ public final class TextRenderer extends BaseRenderer implements Callback {
   @SideEffectFree
   private long getCurrentEventTimeUs(long positionUs) {
     int nextEventTimeIndex = subtitle.getNextEventTimeIndex(positionUs);
-    if (nextEventTimeIndex == 0) {
+    if (nextEventTimeIndex == 0 || subtitle.getEventTimeCount() == 0) {
       return subtitle.timeUs;
     }