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1、ICS 35.040 Ref. No. ISO/IEC 14496-1:2004/Cor.1:2006(E) ISO/IEC 2006 All rights reserved Published in Switzerland INTERNATIONAL STANDARD ISO/IEC 14496-1:2004 TECHNICAL CORRIGENDUM 1 Published 2006-09-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION INTERN
2、ATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALE Information technology Coding of audio-visual objects Part 1: Systems TECHNICAL CORRIGENDUM 1 Technologies de linformation Codage des objets audiovisuels Partie 1: Systmes RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 t
3、o ISO/IEC 14496-1:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. In subclause 7.1.3.5, “Composition Time Stamp (CTS),” replace: 7.1.3.5 Composition Time Stamp (CTS) Each compos
4、ition unit has an associated nominal composition time, the time at which it must be available in the composition memory for composition. The CU is not guaranteed to be available in the composition memory for composition before this time. Since the SDM assumes an instantaneous decoding process, the C
5、U is available to the decoder, at that instant in time corresponding to the DTS of the corresponding AU, for further use (e.g. in prediction processes). This instant in time is implicitly known, if the (constant) temporal distance between successive composition units is indicated in the setup of the
6、 elementary stream. Otherwise a composition time stamp (CTS) whose syntax is defined in 10.2.4 conveys this instant in time. ISO/IEC 14496-1:2004/Cor.1:2006(E) 2 ISO/IEC 2006 All rights reserved The current CU is instantaneously accessible by the compositor anytime between its composition time and t
7、he composition time of the subsequent CU. If a subsequent CU does not exist, the current CU becomes unavailable at the end of the lifetime of its elementary stream (i.e., when its elementary stream descriptor is removed). with: 7.1.3.5 Composition Time Stamp (CTS) Each composition unit has an associ
8、ated nominal composition time, the time at which it must be available in the composition memory for composition. The CU is not guaranteed to be available in the composition memory for composition before this time. Since the SDM assumes an instantaneous decoding process, the CU is available to the de
9、coder, at that instant in time corresponding to the DTS of the corresponding AU, for further use (e.g. in prediction processes). This instant in time is implicitly known, if the (constant) temporal distance between successive composition units is indicated in the setup of the elementary stream. Othe
10、rwise a composition time stamp (CTS) whose syntax is defined in 10.2.4 conveys this instant in time. The current CU is instantaneously accessible by the compositor anytime between its composition time and the composition time of the subsequent CU. If a subsequent CU does not exist, the current CU be
11、comes unavailable at the end of the lifetime of its elementary stream (i.e., when its elementary stream descriptor is removed). In case of audio decoders, the following additionally applies to the audio samples within a composition unit: the composition time applies to the n-th audio sample within t
12、he composition unit. The value of n is 1 unless explicitly specified in ISO/IEC 14496-3 subclause 1.6.6 Interface between Audio and Systems. In subclause 7.2.2.2.2, replace: ExtDescrTagStartRange = 0x60 with: ExtDescrTagStartRange = 0x6A In subclause 7.2.6.16.1, replace: abstract class ExtensionDesc
13、riptor extends BaseDescriptor : bit(8) tag = ExtDescrTagStartRange ExtDescrTagEndRange / empty. To be filled by classes extending this class. with: abstract class ExtensionDescriptor extends BaseDescriptor : bit(8) tag = ExtensionProfileLevelDescrTag, ExtDescrTagStartRange ExtDescrTagEndRange / empt
14、y. To be filled by classes extending this class. ISO/IEC 14496-1:2004/Cor.1:2006(E) ISO/IEC 2006 All rights reserved 3 In subclause 8.3.1, replace: Rule C.1: Classes aligned abstract expandable(maxClassSize) class object_name extends parent_class : bit(length) id_name= object_id | id_range element;
15、/ zero or more elements with: Rule C.1: Classes aligned abstract expandable(maxClassSize) class object_name extends parent_class : bit(length) id_name= object_id | id_range | extended_id_range element; / zero or more elements In subclause 8.3.1, replace: The optional attribute id_name allows to assi
16、gn an object_id, and, if present, is the key demultiplexing entity which allows differentiation between base and derived objects. It is also possible to have a range of possible values: the id_range is specified as start_id end_id, inclusive of both bounds. with: The optional attribute id_name allow
17、s to assign an object_id, and, if present, is the key demultiplexing entity which allows differentiation between base and derived objects. It is also possible to have a range of possible values: the id_range is specified as start_id end_id, inclusive of both bounds. It is also possible to have a combination of id_range and object_id: the extended_id_range is specified as a comma-separated list of object_id and range_id; for example, id_name=object_id1, object_id2, start_id end_id.