SMPTE ST 429-19:2023-09
Revision of SMPTE ST 429-19:2019
SMPTE Standard
D-Cinema Packaging — DCP Operational Constraints for Immersive Audio
Approved - 2023-09-12
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This document was prepared by Technology Committee 27C.
This edition updates external references to their latest versions.
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This document specifies the requirements and constraints for a D-Cinema Package (DCP) that contains Immersive Audio essence as defined in SMPTE ST 2098-2, in addition to the requirements and constraints as defined in SMPTE ST 429-2.
Normative text is text that describes elements of the design that are indispensable or contains the conformance language keywords: "shall", "should", or "may". Informative text is text that is potentially helpful to the user, but not indispensable, and can be removed, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords.
All text in this document is, by default, normative, except: the Introduction, any clause explicitly labeled as "Informative" or individual paragraphs that start with "Note:"
The keywords "shall" and "shall not" indicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitted.
The keywords, "should" and "should not" indicate that, among several possibilities, one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited.
The keywords "may" and "need not" indicate courses of action permissible within the limits of the document.
The keyword "reserved" indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. The keyword "forbidden" indicates "reserved" and in addition indicates that the provision will never be defined in the future.
A conformant implementation according to this document is one that includes all mandatory provisions ("shall") and, if implemented, all recommended provisions ("should") as described. A conformant implementation need not implement optional provisions ("may") and need not implement them as described.
Unless otherwise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative prose shall be the authoritative definition; Tables shall be next; then formal languages; then figures; and then any other language forms.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
For the purposes of this document, the terms and definitions given in the following documents and the additional terms and definitions apply:
All compositions carrying an Immersive Audio essence track shall comply with the SMPTE packaging format as defined by SMPTE ST 429-2.
An Immersive Audio Composition shall be defined as any Composition that contains one or more Immersive Audio assets as defined by SMPTE ST 429-18.
All reels in a Composition Playlist that contain an Immersive Audio asset shall also contain a MainSound asset, with constraints as noted in 7.1.
Each reel of an Immersive Audio Composition should contain an Immersive Audio element, and each reel in a Composition Playlist that contains an Immersive Audio element, shall refer to a single AuxData track and CPL extension element as defined by SMPTE ST 429-18.
To maintain compliance with SMPTE ST 429-2, MainSound tracks shall be present on every reel and contain the same number of channels.
If utilizing the additional CPL metadata as defined within
SMPTE ST 429-16, the MainSoundConfiguration element shall
contain the symbol value token FSKSync for channel 14.
Additionally, if both an MCA sub descriptor extension within the CPL metadata and MCA sub descriptors within the MainSound track file are present, the UL and Label tokens used shall be defined as per SMPTE ST 430-12.
All MainSound assets that are placed in a reel that contains an Immersive Audio asset shall reference a Sound Track File that contains an FSK synchronization signal as described by SMPTE ST 430-12, in container channel 14.
Sound Track Files referenced by an Immersive Audio Composition shall not contain any essence that makes up the Immersive Sound program. Sound Track Files should only carry channels that do not contribute to the Immersive Sound program or any defined soundfield. For example, accessibility tracks for the Deaf and Hard of Hearing, and the narration tracks for the Blind and Partially Sighted Narration, or other tracks can be carried in Sound Track Files.
All Sound Track Files shall carry a ChannelAssignment Label indicating Configuration 4 as per SMPTE ST 429-2.
Immersive Audio essence shall be wrapped as defined by SMPTE ST 429-18.