From 19d1edc08041b57ef69bc8be8fb22c8edc9cae12 Mon Sep 17 00:00:00 2001
From: Rob Walch <rwalch@apple.com>
Date: Mon, 20 Nov 2023 14:14:08 -0800
Subject: [PATCH] Fix regression introduced with #5689 Lazy init CEA608 parsers
 found in #5953

---
 src/controller/timeline-controller.ts | 39 +++++++++++++--------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/src/controller/timeline-controller.ts b/src/controller/timeline-controller.ts
index 4fe852d8a77..c9698a035de 100644
--- a/src/controller/timeline-controller.ts
+++ b/src/controller/timeline-controller.ts
@@ -116,6 +116,18 @@ export class TimelineController implements ComponentAPI {
     hls.on(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);
   }
 
+  private initCea608Parsers() {
+    const { cea608Parser1, cea608Parser2 } = this;
+    if (this.config.enableCEA708Captions && !(cea608Parser1 && cea608Parser2)) {
+      const channel1 = new OutputFilter(this, 'textTrack1');
+      const channel2 = new OutputFilter(this, 'textTrack2');
+      const channel3 = new OutputFilter(this, 'textTrack3');
+      const channel4 = new OutputFilter(this, 'textTrack4');
+      this.cea608Parser1 = new Cea608Parser(1, channel1, channel2);
+      this.cea608Parser2 = new Cea608Parser(3, channel3, channel4);
+    }
+  }
+
   public destroy(): void {
     const { hls } = this;
     hls.off(Events.MEDIA_ATTACHING, this.onMediaAttaching, this);
@@ -131,21 +143,8 @@ export class TimelineController implements ComponentAPI {
     hls.off(Events.SUBTITLE_TRACKS_CLEARED, this.onSubtitleTracksCleared, this);
     hls.off(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);
     // @ts-ignore
-    this.hls = this.config = this.cea608Parser1 = this.cea608Parser2 = null;
-  }
-
-  private lazyInit608() {
-    if (
-      this.config.enableCEA708Captions &&
-      (!this.cea608Parser1 || !this.cea608Parser2)
-    ) {
-      const channel1 = new OutputFilter(this, 'textTrack1');
-      const channel2 = new OutputFilter(this, 'textTrack2');
-      const channel3 = new OutputFilter(this, 'textTrack3');
-      const channel4 = new OutputFilter(this, 'textTrack4');
-      this.cea608Parser1 = new Cea608Parser(1, channel1, channel2);
-      this.cea608Parser2 = new Cea608Parser(3, channel3, channel4);
-    }
+    this.hls = this.config = null;
+    this.cea608Parser1 = this.cea608Parser2 = undefined;
   }
 
   public addCues(
@@ -467,6 +466,7 @@ export class TimelineController implements ComponentAPI {
   }
 
   private onFragLoading(event: Events.FRAG_LOADING, data: FragLoadingData) {
+    this.initCea608Parsers();
     const { cea608Parser1, cea608Parser2, lastCc, lastSn, lastPartIndex } =
       this;
     if (!this.enabled || !(cea608Parser1 && cea608Parser2)) {
@@ -667,7 +667,9 @@ export class TimelineController implements ComponentAPI {
     event: Events.FRAG_PARSING_USERDATA,
     data: FragParsingUserdataData,
   ) {
-    if (!this.enabled) {
+    this.initCea608Parsers();
+    const { cea608Parser1, cea608Parser2 } = this;
+    if (!this.enabled || !(cea608Parser1 && cea608Parser2)) {
       return;
     }
     const { frag, samples } = data;
@@ -677,11 +679,6 @@ export class TimelineController implements ComponentAPI {
     ) {
       return;
     }
-    this.lazyInit608();
-    const { cea608Parser1, cea608Parser2 } = this;
-    if (!cea608Parser1 || !cea608Parser2) {
-      return;
-    }
     // If the event contains captions (found in the bytes property), push all bytes into the parser immediately
     // It will create the proper timestamps based on the PTS value
     for (let i = 0; i < samples.length; i++) {