1、 ETSI TS 126 430 V14.0.0 (2017-04) Universal Mobile Telecommunications System (UMTS); LTE; Timed graphics (3GPP TS 26.430 version 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 126 430 V14.0.0 (2017-04)13GPP TS 26.430 version 14.0.0 Release 14Reference RTS/TSGS-0426430ve00 Keywords LTE,UMTS
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11、. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partners
12、hip Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI ident
13、ities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verba
14、l forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 430 V14.0.0 (2017-04)33GPP TS 26.430 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3
15、Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 Overview and architecture 7g35 SVG-based Timed Graphics . 7g35.1 Introduction 7g35.2 Scene Description Restrictions . 8g35.3 Scene Commands . 8g35.4 Timed Graphic
16、s Media Unit Restrictions . 8g35.5 Timing model . 8g35.6 Processing Model . 8g35.7 Rendering Model 9g35.8 Transport 9g35.9 Timed Graphics Profile 9g35.10 Timed Graphics Level 5 . 10g36 Simple Timed Graphics 10g36.1 Media definition . 10g36.1.1 Introduction. 10g36.1.2 Media component entities . 10g36
17、.1.2.1 JPEG . 10g36.1.2.2 GIF and PNG 10g36.1.2.3 Timed Text 11g36.2 Layout definition 11g36.2.1 Introduction. 11g36.2.2 Rendering position and composition 11g36.3 Random access . 12g36.4 Timing and processing model 12g36.4.1 Timing model 12g36.4.2 Processing model 12g36.5 Transport and Storage 12g3
18、6.5.1 Overview 12g36.5.2 Storage in ISO base media file format files 12g36.5.2.1 Track Header. 12g36.5.2.2 Media component specific configurations 13g36.5.2.2.1 Introduction . 13g36.5.2.2.2 Timed Text 13g36.5.2.2.3 JPEG, GIF and PNG 13g36.5.2.3 Timed Graphics ContentID Box . 14g36.5.2.4 Sample Entry
19、 Name and Format . 14g36.5.2.5 Sample Format 14g36.5.2.6 Sample Modifier Boxes . 14g36.5.2.6.1 Appearance Delay . 14g36.5.2.6.2 HyperText 14g36.5.2.6.3 Box Over-ride . 15g36.5.2.6.4 Stereo Disparity . 15g3ETSI ETSI TS 126 430 V14.0.0 (2017-04)43GPP TS 26.430 version 14.0.0 Release 146.5.3 RTP payloa
20、d format for Timed Graphics . 15g36.5.3.1 General 15g36.6 Registered Types 16g36.6.1 RTP Payload format MIME Type . 16g36.6.2 Codecs Parameter for 3GP files 17g3Annex A (informative): Change history . 18g3History 19g3ETSI ETSI TS 126 430 V14.0.0 (2017-04)53GPP TS 26.430 version 14.0.0 Release 14Fore
21、word This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be
22、 re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the secon
23、d digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction Timed graphics is a media type that enables advanced subtitle like services i
24、n parallel to video. It enables high quality text and graphics at a low cost. In low bit-rate video, the areas which are often perceived as the worst are subtitles and graphics or tables (encoded as part of the video). Encoding subtitles as timed text instead of as part of the video can increase the
25、 perceived quality of the video substantially. Timed Text 4 solves the problem of subtitles and when used gives a perceptual quality much higher that encoding the text as part of the video stream. DIMS 5 allows the placement of vector graphics on top of video - but from an application perspective an
26、d requires DIMS to control the media. Timed Graphics works together with these abovementioned specifications, or independently, to enable better “video“ quality. ETSI ETSI TS 126 430 V14.0.0 (2017-04)63GPP TS 26.430 version 14.0.0 Release 141 Scope The present document defines a timed graphics media
27、 type which reuses components from existing media types. A transport system is defined as is a storage format. The specification is written in a forward-compatible way in order to allow additions of media components and functionality in future releases. It enhances the user experience by enabling gr
28、aphics to be encoded as graphics (as opposed to video) and without requiring an umbrella system such as SMIL or DIMS. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (identi
29、fied by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific refe
30、rence implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 W3C Recommendation: “Scalable Vector Graphics (SVG) Tiny 1.2 Specification“. 3 3GPP TS 26.234: “Transparent end-to-end Packet-switched
31、 Streaming Service (PSS); Protocols and codecs“. 4 3GPP TS 26.245: “Transparent end-to-end Packet-switched Streaming Service (PSS); Timed text format“. 5 3GPP TS 26.142: “Dynamic and Interactive Multimedia Scenes (DIMS“)“. 6 ITU-T Recommendation T.81 (1992) | ISO/IEC 10918-1:1993: “Information techn
32、ology Digital compression and coding of continuous-tone still images Requirements and guidelines“. 7 CompuServe Incorporated: “GIF Graphics Interchange Format: A Standard defining a mechanism for the storage and transmission of raster-based graphics information“, Columbus, OH, USA, 1987. 8 CompuServ
33、e Incorporated: “Graphics Interchange Format: Version 89a“, Columbus, OH, USA, 1990. 9 IETF RFC 2083: “PNG (Portable Networks Graphics) Specification Version 1.0“, Boutell T., et al., March 1997. 10 IETF RFC 4396: “RTP Payload Format for 3rd Generation Partnership Project (3GPP) Timed Text“, Rey J,
34、Matsui Y, February 2006 11 ETSI EN 300 743 v1.4.1“Digital Video Broadcasting (DVB); Subtitling systems“. ETSI ETSI TS 126 430 V14.0.0 (2017-04)73GPP TS 26.430 version 14.0.0 Release 143 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions
35、given in TR 21.905 1 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 1. Timed Graphics Entity: A byte aligned, network independent unit containing timed graphics data 3.2 Abbreviations For the purposes of the
36、 present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 1. DIMS Dynamic and Interactive Multimedia Scenes 4 Overview and architecture Timed g
37、raphics has two main components: The graphics description, i.e. the actual images, and the layout, i.e. a coordinate system describing the placement of the images. Timed graphics is designed in as a media type. It can coexist with umbrella systems (e.g. DIMS or SMIL) just as other media types do, ye
38、t contains components from DIMS or other media types. Figure 1: Example of a Timed Graphics stream, in parallel to an audio and video stream. No “umbrella“ scene description is present. Timed graphics may be realized in one of two ways: SVG-based timed graphics or simple timed graphics mode. In the
39、SVG-based timed graphics, the layout and timing are controlled by the SVG scene. The transport and storage are inherited from DIMS. In the simple timed graphics mode, a binary representation format is defined to enable simple embedding of graphics elements. The transport over RTP and the storage in
40、the 3GP file format are defined by this specification. 5 SVG-based Timed Graphics 5.1 Introduction SVG-based Timed Graphics is defined as a profile of DIMS with certain restrictions and a layout mechanism for rendering timed graphics with external continuous media (i.e. video). Similarly to DIMS, SV
41、G-based Timed Graphics consists of a multimedia scene. The multimedia scene is described using SVG Tiny 1.2 2 and may consist of any combination of still pictures and animated graphics. In SVG-based Timed Graphics, continuous media such as audio and video are not allowed and shall be ignored by the
42、receiver. The profile limitations are described in the following sections. Server Client Video stream Timed Graphics stream Audio/Other stream ETSI ETSI TS 126 430 V14.0.0 (2017-04)83GPP TS 26.430 version 14.0.0 Release 145.2 Scene Description Restrictions SVG Tiny 1.2 shall be used for the descript
43、ion of SVG-based Timed Graphics. The base scene description shall not contain any references to continuous media such as audio or video. The following restrictions to SVG Tiny 1.2 apply to the SVG scene of SVG-based Timed Graphics: Timed Media Elements: audio, video, and animation elements shall not
44、 be present in a timed graphics scene and should be ignored by the timed graphics client. Interactivity: scripting and handling of events is not allowed and shall be ignored by the timed graphics client. Furthermore, SVG-based Timed Graphics scenes should not contain any elements or attributes from
45、DIMS scene extensions. 5.3 Scene Commands Timed Graphics does not support scene commands. In a Timed Graphics scene, DIMS scene commands should not be present and shall be ignored by a terminal that conforms to this specification. 5.4 Timed Graphics Media Unit Restrictions SVG-based Timed Graphics m
46、edia units are DIMS media units that are restricted to complete SVG documents. The DIMS compression method may be applied to Timed Graphics unit body. For Timed Graphics the Unit header fields shall be set as follows: S: is-Scene: shall be set to 1 and may be ignored by a Timed Graphics decoder. M:
47、is-RAP: shall be set to 1 and may be ignored by a Timed Graphics decoder. I: is-redundant: shall be set to 0 and may be ignored by a Timed Graphics decoder. D: redundant-exit: shall be to 0 and may be ignored by a Timed Graphics decoder. P: priority shall be set to 1 and may be ignored by a Timed Gr
48、aphics decoder. C: compression: indicates the compression applied; 0 indicates no compression (textual format); 1 indicates that the content is compressed using the encoding signalled in stream setup. X: reserved: shall be set to 0 and shall be ignored by the receiver 5.5 Timing model Timed Graphics
49、 consists of a sequence of SVG scenes where each incurs a reset of the scene time to 0. The synchronization to external continuous media is achieved using the transport protocol (RTP) timestamps and the sample timestamps in the 3GP file format. The SVG scene itself defines its own timeline, which has as origin the time that corresponds to the presentation time given by the RTP or sample timestamp. The usage of internal timelines should be limited to timing the presentation and removal of the graphics content. This is ensured by d
