Candidate/2.3.0

.github/workflows/build-and-test.yml

@@ -0,0 +1,52 @@
+name: Build and test
+
+on:
+  pull_request:
+    branches: [ "develop", "develop_1.x", "main", "main_1.x" ]
+
+jobs:
+  define-ios-device:
+    name: Get iOS simulator device to run iOS tests on
+    runs-on: macos-latest
+    outputs:
+      device: ${{ steps.ios.outputs.device }}
+    steps:
+      - id: ios
+        run: echo "device=`xcrun xctrace list devices 2>&1 | grep -oE 'iPhone.*?[^\(]+' | head -1 | awk '{$1=$1;print}' | sed -e "s/ Simulator$//"`" >> "$GITHUB_OUTPUT"
+
+  build:
+    name: Build and Test mamba and mambaTVOS
+    runs-on: macos-latest
+    needs: define-ios-device
+    strategy:
+      matrix:
+        target:
+          - scheme: mamba
+            platform: iOS Simulator
+            device: ${{ needs.define-ios-device.outputs.device }}
+          - scheme: mambaTVOS
+            platform: tvOS Simulator
+            device: Apple TV
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build
+        env:
+          scheme: ${{ matrix.target.scheme }}
+          platform: ${{ matrix.target.platform }}
+          device: ${{ matrix.target.device }}
+        run: |
+          echo "scheme = $scheme"
+          echo "platform = $platform"
+          echo "device = $device"
+          xcodebuild build-for-testing -scheme "$scheme" -"workspace" "mamba.xcworkspace" -destination "platform=$platform,name=$device"
+      - name: Test
+        env:
+          scheme: ${{ matrix.target.scheme }}
+          platform: ${{ matrix.target.platform }}
+          device: ${{ matrix.target.device }}
+        run: |
+          echo "scheme = $scheme"
+          echo "platform = $platform"
+          echo "device = $device"
+          xcodebuild test-without-building -scheme "$scheme" -"workspace" "mamba.xcworkspace" -destination "platform=$platform,name=$device"

mamba.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
 s.name              = "mamba"
-s.version           = "2.2.1"
+s.version           = "2.3.0"
 s.license           = { :type => 'Apache License, Version 2.0',
                         :text => <<-LICENSE
                             Copyright 2017 Comcast Cable Communications Management, LLC

mamba.xcodeproj/project.pbxproj

@@ -8,6 +8,21 @@
 
 /* Begin PBXBuildFile section */
 		01CD2E7A1DE4D46F002510E7 /* EXT_X_MAPTagParserTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 01CD2E791DE4D46F002510E7 /* EXT_X_MAPTagParserTests.swift */; };
+		1447582D2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */; };
+		1447582E2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */; };
+		1447582F2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */; };
+		144758312C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */; };
+		144758322C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */; };
+		144758332C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */; };
+		144758352C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */; };
+		144758362C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */; };
+		144758372C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */; };
+		144758392C8620C000D12CCD /* ChannelsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758382C8620C000D12CCD /* ChannelsTests.swift */; };
+		1447583A2C8620C000D12CCD /* ChannelsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758382C8620C000D12CCD /* ChannelsTests.swift */; };
+		1447583B2C8620C000D12CCD /* ChannelsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 144758382C8620C000D12CCD /* ChannelsTests.swift */; };
+		1447583D2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */; };
+		1447583E2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */; };
+		1447583F2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */; };
 		1D28F3451EAA9E500010320B /* hls_ad_master_playlist.m3u8 in Resources */ = {isa = PBXBuildFile; fileRef = 1D28F3401EAA9E500010320B /* hls_ad_master_playlist.m3u8 */; };
 		1D28F3461EAA9E500010320B /* hls_ad_variant_playlist.m3u8 in Resources */ = {isa = PBXBuildFile; fileRef = 1D28F3411EAA9E500010320B /* hls_ad_variant_playlist.m3u8 */; };
 		1D28F3471EAA9E500010320B /* hls_master_playlist_sap.m3u8 in Resources */ = {isa = PBXBuildFile; fileRef = 1D28F3421EAA9E500010320B /* hls_master_playlist_sap.m3u8 */; };
@@ -635,6 +650,11 @@
 
 /* Begin PBXFileReference section */
 		01CD2E791DE4D46F002510E7 /* EXT_X_MAPTagParserTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = EXT_X_MAPTagParserTests.swift; sourceTree = "<group>"; };
+		1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EXT_X_SESSION_KEYValidator.swift; sourceTree = "<group>"; };
+		144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EXT_X_SESSION_DATATagValidator.swift; sourceTree = "<group>"; };
+		144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EXT_X_SESSION_DATAPlaylistValidator.swift; sourceTree = "<group>"; };
+		144758382C8620C000D12CCD /* ChannelsTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ChannelsTests.swift; sourceTree = "<group>"; };
+		1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = VideoLayoutTests.swift; sourceTree = "<group>"; };
 		1D28F3401EAA9E500010320B /* hls_ad_master_playlist.m3u8 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = hls_ad_master_playlist.m3u8; sourceTree = "<group>"; };
 		1D28F3411EAA9E500010320B /* hls_ad_variant_playlist.m3u8 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = hls_ad_variant_playlist.m3u8; sourceTree = "<group>"; };
 		1D28F3421EAA9E500010320B /* hls_master_playlist_sap.m3u8 */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = hls_master_playlist_sap.m3u8; sourceTree = "<group>"; };
@@ -930,6 +950,9 @@
 				EC3B01A11DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupNAMEValidator.swift */,
 				EC3B01A21DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupTYPEValidator.swift */,
 				43DE4EFC1E564DBE00EEE800 /* EXT_X_MEDIARenditionINSTREAMIDValidator.swift */,
+				144758342C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift */,
+				144758302C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift */,
+				1447582C2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift */,
 				43DE4EFA1E564DA300EEE800 /* EXT_X_STARTTimeOffsetValidator.swift */,
 				EC3B01A31DD4D47900B512E3 /* EXT_X_STREAM_INFRenditionGroupValidator.swift */,
 				EC3B01A41DD4D47900B512E3 /* EXT_X_TARGETDURATIONLengthValidator.swift */,
@@ -1318,10 +1341,12 @@
 		EC9BCAA21D749D8B0032BEBE /* Value Types */ = {
 			isa = PBXGroup;
 			children = (
+				144758382C8620C000D12CCD /* ChannelsTests.swift */,
 				EC7492AF1DD29F8900AF4E20 /* CodecArrayTests.swift */,
 				EC7492B01DD29F8900AF4E20 /* MediaTypeTests.swift */,
-				EC7492B21DD29F8900AF4E20 /* ResolutionTests.swift */,
 				EC7492B11DD29F8900AF4E20 /* PlaylistTypeTests.swift */,
+				EC7492B21DD29F8900AF4E20 /* ResolutionTests.swift */,
+				1447583C2C8693E000D12CCD /* VideoLayoutTests.swift */,
 			);
 			path = "Value Types";
 			sourceTree = "<group>";
@@ -1773,6 +1798,7 @@
 				EC7491811DD29C3500AF4E20 /* String+Trim.swift in Sources */,
 				EC7491C31DD29D5C00AF4E20 /* PlaylistValidationIssue.swift in Sources */,
 				ECDE184C22383230008566BB /* PlaylistParser.swift in Sources */,
+				144758352C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */,
 				EC74916E1DD29B5D00AF4E20 /* CollectionType+FindExtensions.swift in Sources */,
 				EC7491DA1DD29D9600AF4E20 /* GenericNoDataTagParser.swift in Sources */,
 				EC7491C91DD29D5C00AF4E20 /* PlaylistWriter.swift in Sources */,
@@ -1847,6 +1873,8 @@
 				EC349ACE2236C3A60077432B /* PlaylistStructureInterface.swift in Sources */,
 				EC3B01A71DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupAUTOSELECTValidator.swift in Sources */,
 				F700CD391E78A2BE001C9487 /* MambaStringRef_ConcreteNSString.m in Sources */,
+				144758312C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */,
+				1447582D2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */,
 				43DE4EFB1E564DA300EEE800 /* EXT_X_STARTTimeOffsetValidator.swift in Sources */,
 				EC74918A1DD29CCB00AF4E20 /* StringDictionaryParser.swift in Sources */,
 				ECDE184022381146008566BB /* MasterPlaylist.swift in Sources */,
@@ -1930,8 +1958,10 @@
 				ECFBD9101E5CCC2200379FC2 /* ParseArrayTests.m in Sources */,
 				EC7492B31DD29F8900AF4E20 /* CodecArrayTests.swift in Sources */,
 				01CD2E7A1DE4D46F002510E7 /* EXT_X_MAPTagParserTests.swift in Sources */,
+				144758392C8620C000D12CCD /* ChannelsTests.swift in Sources */,
 				EC7492AB1DD29F7000AF4E20 /* OrderedDictionaryTests.swift in Sources */,
 				EC7492781DD29EC800AF4E20 /* EXT_X_MEDIATagParserTests.swift in Sources */,
+				1447583D2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -1945,6 +1975,7 @@
 				EC3B01AA1DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupDEFAULTValidator.swift in Sources */,
 				EC3B01C41DD4D49A00B512E3 /* PlaylistOneToManyValidator.swift in Sources */,
 				ECDE184D22383230008566BB /* PlaylistParser.swift in Sources */,
+				144758362C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */,
 				EC7491821DD29C3500AF4E20 /* String+Trim.swift in Sources */,
 				EC7491C41DD29D5C00AF4E20 /* PlaylistValidationIssue.swift in Sources */,
 				EC74916F1DD29B5D00AF4E20 /* CollectionType+FindExtensions.swift in Sources */,
@@ -2019,6 +2050,8 @@
 				EC349ACF2236C3A60077432B /* PlaylistStructureInterface.swift in Sources */,
 				EC7491471DD299B400AF4E20 /* PlaylistTypes.swift in Sources */,
 				F700CD3A1E78A2BE001C9487 /* MambaStringRef_ConcreteNSString.m in Sources */,
+				144758322C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */,
+				1447582E2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */,
 				EC3B01A81DD4D47900B512E3 /* EXT_X_MEDIARenditionGroupAUTOSELECTValidator.swift in Sources */,
 				EC74918B1DD29CCB00AF4E20 /* StringDictionaryParser.swift in Sources */,
 				ECDE184122381146008566BB /* MasterPlaylist.swift in Sources */,
@@ -2102,8 +2135,10 @@
 				ECFBD9111E5CCC2200379FC2 /* ParseArrayTests.m in Sources */,
 				EC7492B81DD29F8900AF4E20 /* PlaylistTypeTests.swift in Sources */,
 				EC7492B41DD29F8900AF4E20 /* CodecArrayTests.swift in Sources */,
+				1447583A2C8620C000D12CCD /* ChannelsTests.swift in Sources */,
 				EC7492AC1DD29F7000AF4E20 /* OrderedDictionaryTests.swift in Sources */,
 				EC7492791DD29EC800AF4E20 /* EXT_X_MEDIATagParserTests.swift in Sources */,
+				1447583E2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -2118,6 +2153,7 @@
 				EC1CCD32209A2CF9006B59FF /* String+Trim.swift in Sources */,
 				EC1CCD46209A2CF9006B59FF /* GenericSingleTagValidator.swift in Sources */,
 				ECDE184E22383230008566BB /* PlaylistParser.swift in Sources */,
+				144758372C83D23100D12CCD /* EXT_X_SESSION_DATAPlaylistValidator.swift in Sources */,
 				EC1CCD30209A2CF9006B59FF /* String+DateParsing.swift in Sources */,
 				EC1CCD53209A2CF9006B59FF /* GenericDictionaryTagWriter.swift in Sources */,
 				EC1CCD55209A2CF9006B59FF /* GenericTagWriter.swift in Sources */,
@@ -2189,7 +2225,9 @@
 				EC1CCD4F209A2CF9006B59FF /* PlaylistTagCardinalityValidation.swift in Sources */,
 				EC1CCD2B209A2CF9006B59FF /* IndeterminateBool.swift in Sources */,
 				EC349AD02236C3A60077432B /* PlaylistStructureInterface.swift in Sources */,
+				144758332C83C72B00D12CCD /* EXT_X_SESSION_DATATagValidator.swift in Sources */,
 				EC1CCD43209A2CF9006B59FF /* EXT_X_STREAM_INFRenditionGroupValidator.swift in Sources */,
+				1447582F2C83C20800D12CCD /* EXT_X_SESSION_KEYValidator.swift in Sources */,
 				EC1CCD35209A2CF9006B59FF /* StringDictionaryParser.swift in Sources */,
 				EC1CCD02209A2CF9006B59FF /* MambaStringRef_ConcreteNSString.m in Sources */,
 				EC1CCD38209A2CF9006B59FF /* GenericNoDataTagParser.swift in Sources */,
@@ -2272,10 +2310,12 @@
 				ECE253FD209A50B500D388CE /* ThirdPartyTagListSupportTests.swift in Sources */,
 				ECE25408209A50B500D388CE /* ResolutionTests.swift in Sources */,
 				ECE253F6209A50B500D388CE /* GenericSingleValueTagParserTests.swift in Sources */,
+				1447583B2C8620C000D12CCD /* ChannelsTests.swift in Sources */,
 				ECE253FA209A50B500D388CE /* GenericSingleTagValidatorTests.swift in Sources */,
 				ECE253F1209A50B500D388CE /* EXT_X_KEYTagParserTests.swift in Sources */,
 				ECE25403209A50B500D388CE /* String+Helio.swift in Sources */,
 				ECE25400209A50B500D388CE /* IndeterminateBoolTests.swift in Sources */,
+				1447583F2C8693E000D12CCD /* VideoLayoutTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -2317,7 +2357,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MARKETING_VERSION = 2.2.2;
+				MARKETING_VERSION = 2.3.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.comcast.mamba;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -2345,7 +2385,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MARKETING_VERSION = 2.2.2;
+				MARKETING_VERSION = 2.3.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.comcast.mamba;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -2410,7 +2450,7 @@
 				INFOPLIST_FILE = mamba/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MARKETING_VERSION = 2.2.2;
+				MARKETING_VERSION = 2.3.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.comcast.mamba;
 				PRODUCT_NAME = mamba;
 				SDKROOT = appletvos;
@@ -2441,7 +2481,7 @@
 				INFOPLIST_FILE = mamba/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MARKETING_VERSION = 2.2.2;
+				MARKETING_VERSION = 2.3.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.comcast.mamba;
 				PRODUCT_NAME = mamba;
 				SDKROOT = appletvos;
@@ -2520,7 +2560,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.13;
-				MARKETING_VERSION = 2.2.2;
+				MARKETING_VERSION = 2.3.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.comcast.mamba;
 				PRODUCT_MODULE_NAME = mamba;
 				PRODUCT_NAME = mamba;
@@ -2554,7 +2594,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.13;
-				MARKETING_VERSION = 2.2.2;
+				MARKETING_VERSION = 2.3.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.comcast.mamba;
 				PRODUCT_MODULE_NAME = mamba;
 				PRODUCT_NAME = mamba;

mambaSharedFramework/Pantos-Generic Playlist Parsing/Pantos-Generic Tag Validators/EXT_X_SESSION_DATAPlaylistValidator.swift

@@ -0,0 +1,52 @@
+//
+//  EXT_X_SESSION_DATAPlaylistValidator.swift
+//  mamba
+//
+//  Created by Robert Galluccio on 8/31/24.
+//  Copyright © 2024 Comcast Corporation.
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License. All rights reserved.
+//
+
+import Foundation
+
+final class EXT_X_SESSION_DATAPlaylistValidator: MasterPlaylistValidator {
+    static func validate(masterPlaylist: any MasterPlaylistInterface) -> [PlaylistValidationIssue] {
+        var issues = [PlaylistValidationIssue]()
+
+        if let issue = duplicateIssue(
+            tags: masterPlaylist.tags.filter { $0.tagDescriptor == PantosTag.EXT_X_SESSION_DATA }
+        ) {
+            issues.append(issue)
+        }
+
+        return issues
+    }
+
+    // A Playlist MAY contain multiple EXT-X-SESSION-DATA tags with the same DATA-ID attribute. A Playlist MUST NOT
+    // contain more than one EXT-X-SESSION-DATA tag with the same DATA-ID attribute and the same LANGUAGE attribute.
+    private static func duplicateIssue(tags: [PlaylistTag]) -> PlaylistValidationIssue? {
+        var dataIdToLanguagesMap = [String: [String?]]()
+        for tag in tags {
+            guard let dataId = tag.value(forValueIdentifier: PantosValue.dataId) else { continue }
+            var existingLanguages = dataIdToLanguagesMap[dataId] ?? []
+            existingLanguages.append(tag.value(forValueIdentifier: PantosValue.language))
+            dataIdToLanguagesMap[dataId] = existingLanguages
+        }
+        for languages in dataIdToLanguagesMap.values {
+            if languages.count != Set(languages).count {
+                return PlaylistValidationIssue(description: .EXT_X_SESSION_DATAPlaylistValidator, severity: .error)
+            }
+        }
+        return nil
+    }
+}