From 0f5aca60f77aa6e085844c47508be4103986cdde Mon Sep 17 00:00:00 2001
From: v-nova-romas <romas.paskevicius@v-nova.com>
Date: Wed, 14 May 2025 11:38:51 +0100
Subject: [PATCH] fix(LCEVC): Create segmentIndex on makeAbortDecision_

The `NetworkInformation.downlink` API is unavailable on Firefox. Without this API, the player starts playback in a lower quality and performs an ABR switch once sufficient network data is available. This PR ensures the switch / abort logic creates the `segmentIndex` for `dependencyStream` correctly in this edge case
---
 lib/media/streaming_engine.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lib/media/streaming_engine.js b/lib/media/streaming_engine.js
index eb42b78d26..c63c4f07c2 100644
--- a/lib/media/streaming_engine.js
+++ b/lib/media/streaming_engine.js
@@ -811,6 +811,11 @@ shaka.media.StreamingEngine = class {
       await originalStream.createSegmentIndex();
     }
 
+    const dependencyStream = originalStream.dependencyStream;
+    if (dependencyStream && !dependencyStream.segmentIndex) {
+      await dependencyStream.createSegmentIndex();
+    }
+
     if (mediaState.operation != originalOperation) {
       // The original operation completed while we were getting a segment index,
       // so there's nothing to do now.
@@ -1374,6 +1379,18 @@ shaka.media.StreamingEngine = class {
       }
     }
 
+    // If the stream has a dependency, make sure its segment index exists.
+    if (mediaState.dependencyMediaState) {
+      if (!mediaState.dependencyMediaState.stream.segmentIndex) {
+        try {
+          await mediaState.dependencyMediaState.stream.createSegmentIndex();
+        } catch (error) {
+          shaka.log.warning(
+              'Could not create segment index for dependency', error);
+        }
+      }
+    }
+
     // Update the MediaState.
     try {
       const delay = this.update_(mediaState);