1、 Copyright 2013 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved August 29, 2013 Table of Contents Page Foreword . 2 Intellectual Property 2 Introduction 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 Par
2、ameters . 4 5 Audio Channels and UL Structure . 4 5.1 Audio Channels 4 5.2 Channel UL Structure . 6 6 Soundfield Groups . 7 7 Group of Soundfield Groups 8 Annex A Bibliography (Informative) . 10 Annex B Guidelines for Name and Symbol Values of Audio Channels, Soundfield Groups and Group of Soundfiel
3、d Groups (Normative) 11 Page 1 of 11 pages SMPTE ST 2067-8:2013 SMPTE STANDARD Interoperable Master Format Common Audio Labels SMPTE ST 2067-8:2013 Page 2 of 11 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organiz
4、ation. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices, and Engineering Guidelines, are prepared by SMPTEs Technology Committees. Participation in these
5、Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in Part XIII of its Operations Manual. SMPTE ST 2067-8 was
6、 prepared by Technology Committee 35PM. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of this Engineering Document. However, attention is drawn to the possibility that some of the elements of this document
7、 may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. Introduction This section is entirely informative and does not form an integral part of this Engineering Document. It is useful to unambiguously identify the nature of audio essen
8、ce in the Interoperable Master Format (IMF). This information can be used, for instance, to inform users of the audio content of an IMF Master Package (see SMPTE ST 2067-2) or automatically route audio essence to proper outputs. It is useful to enable Audio Channels to be combined into logical Sound
9、field Groups, and Soundfield Groups to be combined into Group Of Soundfield Groups. This allows IMF audio essence to be described at a high-level, e.g. 5.1 Soundfield Group, while allowing processing of individual Audio Channels, e.g. routing of the Left Audio Channel to the proper output. SMPTE ST
10、2067-8:2013 Page 3 of 11 pages 1 Scope This standard defines Universal Labels, names and symbols for common Audio Channels, Soundfield Groups and Group of Soundfield Groups for the purpose of labeling IMF audio essence. This standard also provides informative guidance on naming additional Audio Chan
11、nels, Soundfield Groups and Group of Soundfield Groups that may be defined in the future. 2 Conformance Notation 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 th
12、at 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 section e
13、xplicitly 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,
14、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. T
15、he 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
16、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 opt
17、ional 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; followed by formal languages
18、; then figures; and then any other language forms. 3 Normative References The following standards contain provisions that, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
19、 parties to agreements based on this recommended practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 400:2012, SMPTE Labels Structure SMPTE ST 428-12:2013, D-Cinema Distribution Master Common Audio Channels and Soundfi
20、eld Groups SMPTE ST 2067-8:2013 Page 4 of 11 pages 4 Parameters The parameters used to specify Audio Channels, Soundfield Groups, and Groups of Soundfield Groups shall be as defined in SMPTE ST 428-12. 5 Audio Channels and UL Structure 5.1 Audio Channels The Audio Channels specified by this specific
21、ation shall include all Audio channels defined in Table 1 as well as all Audio Channels defined in SMPTE ST 428-12. Audio channels meant to drive loudspeakers are denoted as such. Other audio channels that can be played in multiple ways depending on the downstream reproduction system are named in ac
22、cordance with their overall intent. Table 1 Audio Channels Audio Channel UL Byte 13 (see Table 2) Audio Channel UL Byte 14 (see Table 2) Name Symbol Description 01h 00h Mono One M1 A single channel of monaural audio, which can function on its own or be used in a Dual Mono Soundfield Group 02h 00h Mo
23、no Two M2 A second single channel of monaural audio, identical to the first, which can function on its own or be used in a Dual Mono Soundfield Group 03h 00h Left Total Lt Matrix encoded left channel of an Lt-Rt pair. This indicates that multiple channel of audio have been matrix encoded into two ch
24、annels. If decoded, this will typically drive the Left, Center and Surround loudspeakers. If not decoded, it will typically drive only the left loudspeaker. 04h 00h Right Total Rt Matrix encoded right channel of an Lt-Rt pair. This indicates that multiple channel of audio have been matrix encoded in
25、to two channels. If decoded, this will typically drive the Right, Center and Surround loudspeakers. If not decoded, it will typically drive only the right loudspeaker. 05h 00h Left Surround Total Lst Matrix encoded left surround channel of an Lst-Rst pair. This indicates that Left Surround, Center S
26、urround and Right Surround have been matrix SMPTE ST 2067-8:2013 Page 5 of 11 pages encoded into two channels. If decoded, this will typically drive the Left Surround and Center Surround loudspeakers. If not decoded, it will typically drive only the Left Surround loudspeaker(s). 06h 00h Right Surrou
27、nd Total Rst Matrix encoded right surround channel of an Lst-Rst pair. This indicates that Left Surround, Center Surround and Right Surround have been matrix encoded into two channels. If decoded, this will typically drive the Right Surround and Center Surround loudspeakers. If not decoded, it will
28、typically drive only the Right Surround loudspeaker(s). 07h 00h Surround S A single channel that Intended to drive one or more surround loudspeakers. A.k.a. “Mono Surround”. 08h CHNUM Numbered Source Channel CHNUM NSCCHNUM A single channel of audio that is ordered between 001 and 127 and is intended
29、 to play out in a Discrete Numbered Sources Soundfield Group; for example NSC025. CHNUM indicates the 3-digit channel number that is specified in Byte 14. Note: Multiple Hearing Impaired and Visually Impaired audio channels can be carried as a multichannel mix, each associated with a Hearing Accessi
30、bility or Visual Accessibility Soundfield Group (Table 3), themselves part of a Dialog Centric Mix or Descriptive Video Service Group of Soundfield Groups (see Table 5). Other metadata structures, such as the MCALabelSubDescriptors specified in SMTPE ST 377-4, can be used to associate additional inf
31、ormation, e.g. language, with each Hearing Impaired and Visually Impaired audio channel. SMPTE ST 2067-8:2013 Page 6 of 11 pages 5.2 Channel UL Structure Table 2 shall specify the structure of the Audio Channel UL. Table 2 Audio Channel UL Structure Byte No. Description Value (hex) Meaning 1 Object
32、Identifier 06h 2 Label side 0Eh 3 Designator 2Bh ISO, ORG 4 Designator 34h SMPTE 5 Registry Category Designator 04h Labels 6 Registry Designator 01h Labels Registry 7 Structure Designator 01h Labels Structure 8 Version Number 0Dh Registry Version at the point of registration of this label 9 Item Des
33、ignator 03h Interpretive 10 Essence Kind 02h Sound Essence 11 Essence Facet 01h Audio Channel 12 Audio Channel Designator 20h Audio Channels for SMPTE ST 2067-8 13-14 See Table 1 15-16 Reserved 00h SMPTE ST 2067-8:2013 Page 7 of 11 pages 6 Soundfield Groups The Soundfield Groups specified by this sp
34、ecification shall include all Soundfield Groups defined in Table 3 as well as all Soundfield Groups defined in SMPTE ST 428-12. Table 3 Soundfield Groups The symbols used in the Audio Channels column are those defined in Table 1 Soundfield Group UL Byte13 (see Table 4) Name Symbol Audio Channels Not
35、es 01h Standard Stereo ST L, R Standard Stereo may be applied to two speakers or to a set of headphones. 02h Dual Mono DM M1, M2 A Soundfield Group consisting of the two identical monaural channels, Mono 1 and Mono 2. Generally, these are intended to be played out of two loudspeakers or a set of hea
36、dphones. The two channels are redundant. Either channel can be used independently. 03h Discrete Numbered Sources DNS NSC001, NSC002, A collection of Numbered Source Channels (Table 1), each of which plays on its own and do not represent a particular Soundfield Group. 04h 3.0 30 L, C, R 05h 4.0 40 L,
37、 C, R, S 06h 5.0 50 L, C, R, Ls, Rs 07h 6.0 60 L, C, R, Ls, Rs, Cs 08h 7.0DS 70 L, C, R, Lss, Rss, Rls, Rrs 09h Lt-Rt LtRt Lt, Rt If decoded, this typically plays in a 4.0 Soundfield Configuration. It is also possible to decode into a 5.0 or 5.1 Soundfield Configuration. If the two audio channels ar
38、e not decoded, they typically drive a Standard Stereo Soundfield Configuration. 0Ah 5.1EX 51EX L, C, R, Lst, Rst, LFE If the Lst and Rst channels are decoded, this typically plays in a 6.1 Soundfield Configuration If the Lst and Rst channels are not decoded, this typically plays in a 5.1 Soundfield
39、Configuration, 0Bh Hearing Accessibility HA HI 0Ch Visual Accessibility VA VIN SMPTE ST 2067-8:2013 Page 8 of 11 pages Table 4 shall specify the structure of the Soundfield Group UL. Table 4 Soundfield Group UL Structure Byte No. Description Value (hex) Meaning 1 Object Identifier 06h 2 Label side 0
40、Eh 3 Designator 2Bh ISO, ORG 4 Designator 34h SMPTE 5 Registry Category Designator 04h Labels 6 Registry Designator 01h Labels Registry 7 Structure Designator 01h Labels Structure 8 Version Number 0Dh Registry Version at the point of registration of this label 9 Item Designator 03h Interpretive 10 E
41、ssence Kind 02h Sound Essence 11 Essence Facet 02h Soundfield Group 12 Soundfield Group Designator 20h Soundfield Groups for SMPTE ST 2067-8 13 See Table 3 14-16 Reserved 00h 7 Group of Soundfield Groups The Groups of Soundfield Groups specified by this specification shall include all Groups of Soun
42、dfield Groups defined in Table 5. Table 5 Group of Soundfield Groups Group Of Soundfield Groups UL Byte13 (see Table 6) Name Symbol Definition 01h Main Program MPg Complete primary audio program 02h Descriptive Video Service DVS Narrative description of the visual events taking place in the picture
43、for the visually impaired. For example, this can be a VI-N audio channel mixed with main program. Also referred to as Video Descriptive Service. 03h Dialog Centric Mix Dcm Content with predominant dialog for the hearing impaired. For example, this can be a HI audio channel mixed with main program SM
44、PTE ST 2067-8:2013 Page 9 of 11 pages Table 6 shall specify the structure of the Group of Soundfield Groups UL Table 6 Group of Soundfield Groups UL Structure Byte No. Description Value (hex) Meaning 1 Object Identifier 06h 2 Label side 0Eh 3 Designator 2Bh ISO, ORG 4 Designator 34h SMPTE 5 Registry
45、 Category Designator 04h Labels 6 Registry Designator 01h Labels Registry 7 Structure Designator 01h Labels Structure 8 Version Number 0Dh Registry Version at the point of registration of this label 9 Item Designator 03h Interpretive 10 Essence Kind 02h Sound Essence 11 Essence Facet 03h Group of So
46、undfield Groups 12 Group Of Soundfield Groups Designator 20h Group of Soundfield Groups for SMPTE ST 2067-8 13 See Table 5 14-16 Reserved 00h SMPTE ST 2067-8:2013 Page 10 of 11 pages Annex A Bibliography (Informative) SMPTE ST 377-4:2012. MXF Multichannel Audio Labeling Framework SMPTE ST 2067-2:201
47、3, Interoperable Master Format Core Constraints Recommendation ITU-R BR.1384 (03/11), Parameters for International Exchange of Multi-Channel Sound Recordings with or without Accompanying Picture SMPTE ST 2067-8:2013 Page 11 of 11 pages Annex B Guidelines for Name and Symbol Values of Audio Channels,
48、 Soundfield Groups and Group of Soundfield Groups (Normative) Specifications defining Audio Channels, Soundfield Groups should use the recommendations of Annex D in SMPTE ST 428-12. Specifications defining a Group of Soundfield Groups should define a Name that reflects the intended use of the groupi
49、ng, and is particular and recognizable to the application that registers them. The corresponding Symbol should be a mnemonic representation of the Name, and follow the provisions of Section 5.4 in SMPTE ST 428-12. For example, the Name of a Group of Soundfield Groups consisting of a 5.1 mix, an Lt-Rt mix and a Commentary could be “Broadcast Program“ and its corresponding Symbol “Bpg“.
