1、 Reference numberISO/IEC 14496-20:2008/Amd.2:2010(E)ISO/IEC 2010 INTERNATIONAL STANDARD ISO/IEC14496-20Second edition2008-12-01AMENDMENT 22010-03-01Information technology Coding of audio-visual objects Part 20:Lightweight Application Scene Representation(LASeR)and Simple Aggregation Format(SAF)AMEND
2、MENT 2:Technology for scene adaptation Technologies de linformation Codage des objets audiovisuels Partie 20:Reprsentation de scne dapplication allge(LASeR)et format dagrgation simple(SAF)AMENDEMENT 2:Technologies pour adaptation de scne ISO/IEC 14496-20:2008/Amd.2:2010(E)PDF disclaimer This PDF fil
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7、 requester.ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel.+41 22 749 01 11 Fax +41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2010 All rights reserved ISO/IEC 14496-20:2008/Amd.2:2010(E)ISO/IEC 2010 All rights reserved iiiForeword ISO(the Int
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10、nformation technology,ISO and IEC have established a joint technical committee,ISO/IEC JTC 1.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives,Part 2.The main task of the joint technical committee is to prepare International Standards.Draft Internationa
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12、e subject of patent rights.ISO and IEC shall not be held responsible for identifying any or all such patent rights.Amendment 2 to ISO/IEC 14496-20:2008 was prepared by Joint Technical Committee ISO/IEC JTC 1,Information technology,Subcommittee SC 29,Coding of audio,picture,multimedia and hypermedia
13、information.ISO/IEC 14496-20:2008/Amd.2:2010(E)ISO/IEC 2010 All rights reserved 1Information technology Coding of audio-visual objects Part 20:Lightweight Application Scene Representation(LASeR)and Simple Aggregation Format(SAF)AMENDMENT 2:Technology for scene adaptation In Table 3,add the following
14、 new LASeR events:Event name Namespace Description Bubble Canc.IDL“DisplaySizeChanged(A)”Urn:mpeg:mpeg4:laser:200 x Occurs when the terminal screen or viewport size has been changed to the specified A value.A is expressed in Inches.DisplaySizeChangedEvent“MemoryStatus(a,b,c)”Urn:mpeg:mpeg4:laser:200
15、 x Occurs when the terminal memory occupancy changes more than the each specified parameter.MemoryStatusEvent The parameters of MemoryStatus event are:a:number of graphics points.If the number of graphic points released/allocated by the terminal is strictly less than a,the event is not triggered.b:n
16、umber of Unicode characters.If the number of Unicode characters released/allocated by the terminal is strictly less than b,the event is not triggered.c:size,in kilo-bytes,of the composition buffers(as described in 6.11.3).If the size released/allocated by the terminal is strictly less than c,the event is not triggered.In 6.5.6,add the new attribute delta to ExternalValueEvent:interface ExternalValueEvent:LASeREvent readonly attribute float absoluteValue;readonly attribute boolean computableAsFra
