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TECHNICAL SPECIFICATION
DTS-UHD Audio Format;
Delivery of Channels, Objects and Ambisonic Sound Fields
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2 ETSI TS 103 491 V1.2.1 (2019-05)
Reference
RTS/JTC-DTS-UHDv121
Keywords
audio, codec, object audio
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3 ETSI TS 103 491 V1.2.1 (2019-05)
Contents
Intellectual Property Rights . 23
Foreword . 23
Modal verbs terminology . 23
1 Scope . 24
2 References . 24
2.1 Normative references . 24
2.2 Informative references . 25
3 Definition of terms, symbols, abbreviations and document conventions . 25
3.1 Terms . 25
3.2 Symbols . 26
3.3 Abbreviations . 26
3.4 Document Conventions . 27
4 DTS-UHD System Overview . 27
4.1 Overview . 27
4.2 Stream Construction . 28
4.2.1 Construction of a DTS-UHD Audio Frame . 28
4.2.2 Frame Table of Contents (FTOC) . 28
4.2.3 Sync Frames. 29
4.2.4 Non-sync Frames (Predictive Frames) . 29
4.3 Carriage of Metadata . 29
4.3.1 Organization of Metadata . 29
4.3.2 Metadata Chunks . 30
4.3.3 Fundamental Components of the Metadata Chunk . 31
4.3.3.1 Metadata Chunk: Data . 31
4.3.3.2 Reserved and Byte Align Fields . 31
4.3.3.3 Metadata Chunk CRC Word . 31
4.4 Audio Chunks . 31
4.5 Organization of Streams . 33
4.5.1 Objects, Object Groups, Presentations . 33
4.5.2 Properties of Objects . 33
4.5.3 Properties of Object Groups. 33
4.5.4 Audio Presentations . 34
5 DTS-UHD Header Tables and Helper Functions . 37
5.1 Overview . 37
5.2 Constants, Tables and Helper Functions . 37
5.2.1 Fixed Point Constants . 37
5.2.2 Look-up Tables . 37
5.2.2.1 Scale Factor Table . 37
5.2.2.2 Long Term Loudness Measure Table . 37
5.2.2.3 Per-Object Long Term Loudness Measure Table . 37
5.2.2.4 Quantization Table for DRC Fast Attack Smoothing Constant. 38
5.2.2.5 Quantization Table for DRC Fast Release Smoothing Constant . 38
5.2.2.6 Quantization Table for DRC Slow to Fast Threshold . 38
5.2.2.7 Inverse Quantization Table for the Exponential Window Smoothing Parameter Lambda. 38
5.2.3 Helper Functions . 39
5.2.3.1 ExtractVarLenBitFields . 39
5.2.3.2 UpdateCode . 39
5.2.3.3 CountBitsSet_to_1 . 41
5.2.3.4 GetPtrToCurrentByte . 41
5.2.3.5 GetBitCounter . 41
5.2.3.6 AdvanceBitReadPointer . 41
5.3 Interfaces for Extracting Metadata Frames . 42
5.3.1 Overview of APIs . 42
5.3.2 Audio Presentation Selection . 42
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4 ETSI TS 103 491 V1.2.1 (2019-05)
5.3.3 Play Default Presentation . 42
5.3.4 Play Selected Presentation . 43
5.3.5 Play from a List of Objects . 43
6 DTS-UHD Metadata Header Parsing . 43
6.1 Overview . 43
6.2 UnpackMDFrame . 44
6.3 Functions and Tables Supporting UnpackMDFrame . 46
6.3.1 ResetMDChunks . 46
6.3.2 Metadata Chunk Types . 46
6.3.3 Audio Presentation Index . 47
6.3.4 ExtractMDChunkObjIDList . 47
6.3.5 Parameters in ExtractMDChunkObjIDList . 48
6.3.5.1 m_unNumObjects . 48
6.3.5.2 unNumBitsforObjID . 48
6.3.5.3 m_unObjectID . 48
6.3.6 Update Object List . 48
6.3.7 Reserved and Byte Alignment Fields . 49
6.3.8 Metadata Chunk CRC . 50
6.4 Frame Table of Contents (FTOC) . 51
6.4.1 Overview of the FTOC . 51
6.4.2 FTOC Class Parameters . 51
6.4.3 Extract FTOC . 52
6.4.4 Parameters for FTOC . 52
6.4.4.1 unSyncWord. 52
6.4.4.2 bSyncFrameFlag . 53
6.4.4.3 unFTOCPayloadinBytes . 53
6.4.5 Stream Parameters . 53
6.4.6 Parameters for ExtractStreamParams. 54
6.4.6.1 Full Channel-based Mix Flag . 54
6.4.6.2 CRC Test . 54
6.4.6.3 Stream Version Number . 54
6.4.6.4 Base Duration . 55
6.4.6.5 Frame Duration . 55
6.4.6.6 Clock Rate . 55
6.4.6.7 Time Code Parameters . 55
6.4.6.8 Audio Sampling Rate . 56
6.4.6.9 Number of Audio Samples . 56
6.4.6.10 Reserved Flag . 56
6.4.6.11 Object Interactivity Limits Present Flag . 56
6.4.7 ResolveAudPresParams . 56
6.4.8 Parameter for ResolveAudPresParams . 57
6.4.8.1 Number of Audio Presentations . 57
6.4.9 Extract Audio Presentation Parameters. 57
6.4.10 Parameters for ExtractAudPresParams . 58
6.4.10.1 bAudPresSelectableFlag . 58
6.4.10.2 unDepAuPresMask . 59
6.4.10.3 Explicit Object List Present Flag . 59
6.4.11 ExtractExplicitObjectsLists . 59
6.4.12 Parameters for ExtractExplicitObjectLists . 60
6.4.12.1 Explicit Object List Update Flag . 60
6.4.12.2 Explicit Object List Mask . 60
6.4.12.3 Metadata Describing Presentation Scaling for Different Playback Configurations . 60
6.4.12.4 Extract and Save All Audio Presentation Parameters . 60
6.4.13 Navigation Parameters for Metadata and Audio Chunks . 61
6.4.14 Parameters for ExtractChunkNaviData . 62
6.4.14.1 Number of Metadata Chunks . 62
6.4.14.2 Sizes of Metadata Chunks . 62
6.4.14.3 Metadata Chunks CRC Flag . 63
6.4.14.4 Number of Audio Chunks . 63
6.4.14.5 Audio Chunk Handler ResetList . 63
6.4.14.6 ResetAudioChunkPresentFlags . 63
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5 ETSI TS 103 491 V1.2.1 (2019-05)
6.4.14.7 Audio Chunk Index . 63
6.4.14.8 FindAudioChunkListIndex . 63
6.4.14.9 Audio Chunk ID Present Flag . 64
6.4.14.10 Audio Chunk ID . 64
6.4.14.11 Audio Chunk Size in Bytes . 64
6.4.14.12 Purge List . 64
6.4.15 Peak Bit Rate Smoothing Parameters . 65
6.4.16 Parameters for ExtractPBRSmoothParams . 66
6.4.16.1 m_bVBRSmoothingBufferEnabled. 66
6.4.16.2 nuBitsforCumACPayload . 66
6.4.16.3 m_nuAudioChunksCumulSmoothPayload . 66
6.4.16.4 m_bACFirstXLLSyncPresent . 66
6.4.16.5 nuVBRSmoothingBuffSzkB . 66
6.4.16.6 m_nuInitACXLLDecDlyFrames . 66
6.4.16.7 m_nuACFirstXLLSyncOffsInDWORDS . 67
6.4.17 Reserved Fields . 67
6.4.18 FTOC CRC Word . 67
7 Metadata Chunk (ID = 0x01) . 68
7.1 Overview . 68
7.2 Object Class Description and Handler Functions . 68
7.3 Functions Called from UnpackMDFrame . 69
7.3.1 ApplyExplObjList2ObjActMask . 69
7.3.2 ApplyGroupDefaultObjectActivityMask . 70
7.3.3 Find Object Index . 71
7.4 Extract_Main_0x01_MDChunk . 71
7.5 Functions Called from Extract_Main_0x01_MDChunk . 72
7.5.1 Presentation Scaling Parameters . 72
7.5.2 Parameters for ExtractPresScalingParams . 73
7.5.2.1 bOutScalePresent . 73
7.5.2.2 Presentation Scale . 73
7.5.3 m_bMFDistrStaticMDPresent . 73
7.6 Static Metadata Distributed Over Multiple Frames . 74
7.7 Parameters for ExtractMultiFrameDistribStaticMD . 75
7.7.1 m_unNumStaticMDPackets . 75
7.7.2 m_unStaticMDPacketByteSize . 75
7.7.3 m_bStaticMetadataUpdtFlag . 76
7.7.4 Metadata Packet Payload . 76
7.7.5 Static Loudness and Dynamics Metadata . 76
7.7.6 Parameters for ExtractStaticLandDParams . 78
7.7.6.1 m_bNominalLD_DescriptionFlag . 78
7.7.6.2 Integrated Loudness Parameters . 78
7.7.6.3 m_ucNumLongTermLoudnessMsrmSets . 78
7.7.6.4 Long Term Loudness Measure Parameter Set. 78
7.7.6.5 Parameters for ExtractLTLMParamSet . 79
7.7.6.5.1 m_rLoudness . 79
7.7.6.5.2 m_ucAssociatedAssetType . 79
7.7.6.5.3 m_ucLoudnessMsrmType . 80
7.7.6.6 m_bIsLTLoudnMsrsmOffLine. 80
7.7.6.7 m_bCustomDRCCurveMDPresent . 81
7.7.6.8 Custom DRC Curves . 81
7.7.6.9 Parameters for ExtractCustomDRCCurves . 82
7.7.6.9.1 m_ucDRCCurveIndex . 82
7.7.6.9.2 unDRCCurveCode . 82
7.7.6.9.3 Get DRC Curve . 83
7.7.6.10 m_bCustomDRCSmoothMDPresent . 84
7.7.6.11 m_rFastAttack . 84
7.7.6.12 m_rSlowAttack . 84
7.7.6.13 m_rFastRelease . 84
7.7.6.14 m_rSlowRelease . 84
7.7.6.15 m_rAttackThreshld . 84
7.7.6.16 m_rReleaseThreshld . 85
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