From 3db710c6a9969b906bce0ed2843e272b8079454a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Velad=20Galv=C3=A1n?= <ladvan91@hotmail.com>
Date: Tue, 24 Dec 2024 13:10:40 +0100
Subject: [PATCH] fix(HLS): Do not use EXT-X-PROGRAM-DATE-TIME on vod when
 there is only video or audio (#7802)

Fixes https://github.com/shaka-project/shaka-player/issues/7774

Backported to v4.12.x
---
 lib/hls/hls_parser.js | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/lib/hls/hls_parser.js b/lib/hls/hls_parser.js
index 3f79affcb1..21f89276b2 100644
--- a/lib/hls/hls_parser.js
+++ b/lib/hls/hls_parser.js
@@ -2582,12 +2582,23 @@ shaka.hls.HlsParser = class {
       }
     }
     this.notifySegmentsForStreams_(streamInfos.map((s) => s.stream));
-    const liveWithNoProgramaDateTime =
+
+    const activeStreamInfos = Array.from(this.uriToStreamInfosMap_.values())
+        .filter((s) => s.stream.segmentIndex);
+    const ContentType = shaka.util.ManifestParserUtils.ContentType;
+    const hasAudio =
+        activeStreamInfos.some((s) => s.stream.type == ContentType.AUDIO);
+    const hasVideo =
+        activeStreamInfos.some((s) => s.stream.type == ContentType.VIDEO);
+
+    const liveWithNoProgramDateTime =
         this.isLive_() && !this.usesProgramDateTime_;
+    const vodWithOnlyAudioOrVideo = !this.isLive_() &&
+        this.usesProgramDateTime_ && !(hasAudio && hasVideo);
     if (this.config_.hls.ignoreManifestProgramDateTime ||
-        liveWithNoProgramaDateTime) {
+        liveWithNoProgramDateTime || vodWithOnlyAudioOrVideo) {
       this.syncStreamsWithSequenceNumber_(
-          streamInfos, liveWithNoProgramaDateTime);
+          streamInfos, liveWithNoProgramDateTime);
     } else {
       this.syncStreamsWithProgramDateTime_(streamInfos);
       if (this.config_.hls.ignoreManifestProgramDateTimeForTypes.length > 0) {