From a371f434acca086e7e38959ef7067277c6e4a014 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Velad=20Galv=C3=A1n?= <ladvan91@hotmail.com>
Date: Tue, 9 Jan 2024 08:47:31 +0100
Subject: [PATCH] fix(DASH): Fix bad error on DASH DAI (#6047)

Fixes https://github.com/shaka-project/shaka-player/issues/6010
---
 lib/util/periods.js | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/lib/util/periods.js b/lib/util/periods.js
index 37115ab31d..d6ed896504 100644
--- a/lib/util/periods.js
+++ b/lib/util/periods.js
@@ -790,11 +790,34 @@ shaka.util.PeriodCombiner = class {
         for (const codec of match.codecs.split(',')) {
           codecs.add(codec);
         }
-        outputStream.codecs = Array.from(codecs).join(',');
+        const PeriodCombiner = shaka.util.PeriodCombiner;
+        outputStream.codecs = PeriodCombiner.filterDuplicateCodecs_(
+            Array.from(codecs)).join(',');
       }
     }
   }
 
+  /**
+   * @param {!Array.<string>} codecs
+   * @return {!Array.<string>} codecs
+   * @private
+   */
+  static filterDuplicateCodecs_(codecs) {
+    // Filter out duplicate codecs.
+    const seen = new Set();
+    const ret = [];
+    for (const codec of codecs) {
+      const shortCodec = shaka.util.MimeUtils.getCodecBase(codec);
+      if (!seen.has(shortCodec)) {
+        ret.push(codec);
+        seen.add(shortCodec);
+      } else {
+        shaka.log.debug('Ignoring duplicate codec');
+      }
+    }
+    return ret;
+  }
+
   /**
    * Clone a Stream to make an output Stream for combining others across
    * periods.