fix(CEA): Ignore XDS control codes (#6702)

Thanks @tykus160
shaka-project · May 30, 2024 · f69694a · f69694a
1 parent 2e248db
commit f69694a
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diff --git a/lib/cea/cea608_data_channel.js b/lib/cea/cea608_data_channel.js
@@ -642,6 +642,15 @@ shaka.cea.Cea608DataChannel = class {
     // b1 -> |P|0|0|1|X|X|X|X|
     return (b1 & 0x70) === 0x10;
   }
+
+  /**
+   * Checks if the data contains a XDS control code.
+   * @param {number} b1 Byte 1.
+   * @return {boolean}
+   */
+  static isXdsControlCode(b1) {
+    return b1 >= 0x01 && b1 <= 0x0F;
+  }
 };
 
 /**

diff --git a/lib/cea/cea_decoder.js b/lib/cea/cea_decoder.js
@@ -307,6 +307,11 @@ shaka.cea.CeaDecoder = class {
     ccPacket.ccData1 &= 0x7f;
     ccPacket.ccData2 &= 0x7f;
 
+    // Ignore XDS
+    if (shaka.cea.Cea608DataChannel.isXdsControlCode(ccPacket.ccData1)) {
+      return null;
+    }
+
     // Check for empty captions and skip them.
     if (!ccPacket.ccData1 && !ccPacket.ccData2) {
       return null;