1、 Copyright 2012 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved March 14, 2012 Table of Contents Page Foreword 2 1 Scope 3 2 Source Descriptor Properties . 3 Page 1 of 4 pages Amendment 1:2012 to SMPTE ST 377-1:2011 SMPTE STAN
2、DARD Material Exchange Format (MXF) File Format Specification Amendment 1 Amendment 1:2012 to SMPTE ST 377-1:2011 Page 2 of 4 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organization. Headquartered and incorporat
3、ed in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices, Engineering Guidelines and Registered Disclosure Documents, are prepared by SMPTEs Technology Committees. Participation in these Com
4、mittees 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 Administrative Practices. SMPTE Amendment
5、 1 to SMPTE ST 377-1:2011 was prepared by Technology Committee 31FS. Amendment 1:2012 to SMPTE ST 377-1:2011 Page 3 of 4 pages 1 Scope The purpose of this amendment is to address a request from 21DC to enhance SMPTE ST 377-1:2011 by incorporating the “Channel IDs” and “Mono Source Track IDs” propert
6、ies found in SMPTE ST 382:2007. 2 Source Descriptor Properties 2.1 In Annex B.23 (Source Clip (Sound) on page 126, extend the table with the items “Channel IDs” and “Mono Source Track IDs” Change from: Item Name Type Len Local Tag Item UL Req ? Meaning Default Source Clip Set Key 16 As defined in 9.
7、6 (see Table 17) Req Defines the Source Clip Set Length BER Length var Req Set length (see 9.3) All items in B.10 except the Key or Group UL and Length, if present See B.10 See B.10 See B.10 See B.10 See B.10 See B.10 To: Item Name Type Len Local Tag Item UL Req ? Meaning Default Source Clip Set Key
8、 16 As defined in 9.6 (see Table 17) Req Defines the Source Clip Set Length BER Length var Req Set length (see 9.3) All items in B.10 except the Key or Group UL and Length, if present See B.10 See B.10 See B.10 See B.10 See B.10 See B.10 Channel IDs Array of Uint32 8+ 4n 1103 06.0E.2B.34. 01.01.01.0
9、7. 06.01.01.03. 07.00.00.00 Opt Ordered Array of Channel ID referenced by this Source Clip. RP210 Specifies an ordered array of channels within the referenced precursor Mono Source Track IDs Array of Uint32 8+ 4n 1104 06.0E.2B.34. 01.01.01.08. 06.01.01.03. 08.00.00.00 Opt Ordered Array of Track lDs
10、referenced by this Source Clip. RP210 Specifies an ordered array of tracks within the referenced precursor 2.2 Append the following text to Annex B.23 (Source Clip (Sound) on page 126 The optional Channel IDs and Mono Source Track IDs properties may be used when a package references a lower-level pa
11、ckage such that the reference: extracts one or two channels of audio from an N-channel lower-level package combines mono tracks from the lower-level package to form a multi-channel package These properties are not intended to be used either for a generalized N-channel to M-channel mapping mechanism
12、or as global identifiers. Their scope is limited to a single track within a top-level file package, as identified by the Source Track ID and Package ID properties in the case of a Source Clip (see Section B.10.) A Source Clip shall not simultaneously contain both a Channel IDs property and a Mono So
13、urce Track IDs property. Amendment 1:2012 to SMPTE ST 377-1:2011 Page 4 of 4 pages B.23.1 Optional Mapping of Subchannels of Sound Elements to Material Package If present, the Channel IDs property shall reference one or two channels out of N-channel essence described by a top-level file package. Thi
14、s is used to break out a single track of multi-channel sound into individual mono sound tracks, or to identify a stereo sound pair within a multi-channel essence container. Each essence container specification that uses this mechanism shall define any specific semantics of Channel ID for that essenc
15、e Note: In the case of sound compressed and mapped into AES pairs according to SMPTE ST 337, each AES pair can contain multiple SMPTE ST 337 streams and hence channels. B.23.2 Optional combination of Source Package Tracks If present, the optional Mono Source Track IDs property shall identify the sin
16、gle channel tracks of lower-level source packages which were combined to form a multi-channel track. When the Mono Source Track IDs property is present, the value of the Source Track ID property of the Source Clip (see Section B.10) shall be ignored. Note: The Mono Source Track IDs property is used on a top-level file package to describe the transfer of several individual single-channel inputs from a source device into a multi-channel essence container.
