1、 ETSI TS 103 544-21 V1.3.0 (2017-10) Publicly Available Specification (PAS); Intelligent Transport Systems (ITS); MirrorLink; Part 21: High Speed Media Link (HSML) CAUTION The present document has been submitted to ETSI as a PAS produced by CCC and approved by the ETSI Technical Committee Intelligen
2、t Transport Systems (ITS). CCC is owner of the copyright of the document CCC-TS-054 and/or had all relevant rights and had assigned said rights to ETSI on an “as is basis“. Consequently, to the fullest extent permitted by law, ETSI disclaims all warranties whether express, implied, statutory or othe
3、rwise including but not limited to merchantability, non-infringement of any intellectual property rights of third parties. No warranty is given about the accuracy and the completeness of the content of the present document. TECHNICAL SPECIFICATION ETSI ETSI TS 103 544-21 V1.3.0 (2017-10)2 Reference
4、DTS/ITS-88-21 Keywords interface, ITS, PAS, smartphone ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important
5、 notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written auth
6、orization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should
7、 be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to one of the follo
8、wing services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF v
9、ersion shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. ETSI 2017. Car Connectivity Consortium 2011-2017. All rights reserved. ETSI logo is a Trade Mark of ETSI registered for the benefit of its Members.
10、 MirrorLink is a registered trademark of Car Connectivity Consortium LLC. RFB and VNC are registered trademarks of RealVNC Ltd. UPnP is a registered trademark of UPnP Forum. Other names or abbreviations used in the present document may be trademarks of their respective owners. DECTTM, PLUGTESTSTM, U
11、MTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSM and the GSM logo are trademar
12、ks registered and owned by the GSM Association. ETSI ETSI TS 103 544-21 V1.3.0 (2017-10)3 Contents Intellectual Property Rights 4g3Foreword . 4g3Modal verbs terminology 4g31 Scope 5g32 References 5g32.1 Normative references . 5g32.2 Informative references 5g33 Abbreviations . 6g34 Introduction 6g35
13、HSML USB Architecture . 7g35.1 General . 7g35.2 Functional Characteristics 7g35.2.1 General 7g35.2.2 Interface 7g35.2.3 Endpoints 7g35.2.3.1 General 7g35.2.3.2 Default. 8g35.2.3.3 Framebuffer . 8g35.3 Vendor-Specific Codes . 8g35.4 Interface Descriptor 8g35.5 Endpoint Descriptors 8g35.6 HSML Request
14、s . 9g35.6.1 General 9g35.6.2 GetVersion 9g35.6.3 GetParameters . 10g35.6.4 SetParameters . 11g35.6.5 StartFramebufferTransmission . 12g35.6.6 PauseFramebufferTransmission 12g35.6.7 StopFramebufferTransmission 12g35.6.8 SetMaxFrameRate 12g35.6.9 GetIdentifier 13g36 HSML Framebuffer Transmission Prot
15、ocol . 13g36.1 General . 13g36.2 Managing an HSML Connection 14g36.2.1 Identifying Remote Applications 14g36.2.2 Establishing the HSML Connection . 14g36.2.3 Intentionally Terminating the HSML Connection 14g36.2.4 Unintentionally Terminating the HSML Connection . 14g36.3 HSML Protocol Phases 15g36.3
16、.1 Initialization Phase 15g36.3.2 Transmission Phase. 16g36.3.2.1 Handling Context Information 16g36.3.2.2 Handling Display Data 17g36.3.2.3 Handling Pausing and Resuming Data Transfer . 19g36.3.2.4 Handling Framebuffer Resolution Change 19g36.3.2.5 Handling Framebuffer Format Change . 21g36.3.2.6 H
17、andling Framerate Adjustment . 21g36.3.2.7 Handling Framebuffer Blocking Notification . 22g36.3.2.8 Handling Orientation Changes 23g36.3.2.9 Handling Content Attestation 24g36.3.3 HSML Protocol Finite State Machine . 25g3Annex A (informative): Authors and Contributors . 26g3History 27 ETSI ETSI TS 1
18、03 544-21 V1.3.0 (2017-10)4 Intellectual Property Rights Essential patents IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be fo
19、und in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR P
20、olicy, no investigation, including IPR searches, has been carried out by ETSI. 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. Trademarks The
21、present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of thos
22、e trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Intelligent Transport Systems (ITS). The present document
23、is part 21 of a multi-part deliverable. Full details of the entire series can be found in part 1 i.1. 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
24、.2 of the ETSI Drafting Rules (Verbal 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 103 544-21 V1.3.0 (2017-10)5 1 Scope The present document is part of the MirrorLinkspecification which specifies
25、 an interface for enabling remote user interaction of a mobile device via another device. The present document is written having a vehicle head-unit to interact with the mobile device in mind, but it will similarly apply for other devices, which provide a colour display, audio input/output and user
26、input mechanisms. The present document describes the High-Speed Media Link, a video transmission mechanism that utilizes the USB to project the screen of one device onto another device with a larger screen. 2 References 2.1 Normative references References are either specific (identified by date of p
27、ublication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly availab
28、le in the expected location might be found at https:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long-term validity. The following referenced documents are necessary for the application of the presen
29、t document. 1 ETSI TS 103 544-3 (V1.3.0): “Publicly Available Specification (PAS); Intelligent Transport Systems (ITS); MirrorLink; Part 3: Audio“. 2 ETSI TS 103 544-2 (V1.3.0): “Publicly Available Specification (PAS); Intelligent Transport Systems (ITS); MirrorLink; Part 2: Virtual Network Computin
30、g (VNC) based Display and Control“. 3 USB IF: “Universal Serial Bus Specification“, Revision 2.0, April 27, 2000. 4 IETF RFC 4122: “A Universally Unique Identifier (UUID) URN Namespace“, July 2005. NOTE: Available at http:/www.ietf.org/rfc/rfc4122.txt. 5 USB IF: “Universal Serial Bus, Communications
31、 Class, Subclass Specification for Ethernet Control Model Devices“, Revision 1.2, February 9, 2007. NOTE: Available at http:/www.usb.org/developers/docs/devclass_docs/. 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version numbe
32、r) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
33、their long-term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 ETSI TS 103 544-1 (V1.3.0): “Publicly Available Specification (PAS); Intelligent Transport Systems (ITS);
34、MirrorLink; Part 1: Connectivity“. ETSI ETSI TS 103 544-21 V1.3.0 (2017-10)6 3 Abbreviations For the purposes of the present document, the following abbreviations apply: EP Endpoint HSML High Speed Media Link ML MirrorLink RLE (Scan-line based) Run Length Encoding UPnP Universal Plug and Play USB Un
35、iversal Serial Bus 4 Introduction High Speed Media Link (HSML) is a screen out technology. The main purpose is to let mobile users project their phones screens to a larger one, like the display inside a car infotainment system or PC, and users can control their phones via an automotive head unit or
36、PC. With bigger screens, users can have much better usage experience. Of course, the present document does not limit the usage scenarios only on mobile phones and automotive head units. The HSML can be applied to any device that conforms to the present document. As shown in Figure 1. Figure 1: HSML
37、Protocol Stack There are two roles in the HSML architecture. The HSML source is the source of video data and the HSML sink is sink side. On the other hand, the control data is sent from HSML sink to HSML source. Figure 2: HSML Overview The audio and additional display control mechanisms are handled
38、by MirrorLink requirements defined in 1 and 2. Therefore, any device that wants to comply with the present document shall implement MirrorLink as well. ETSI ETSI TS 103 544-21 V1.3.0 (2017-10)7 The MirrorLink client, providing HSML functionality, shall implement the HSML sink functionality. The Mirr
39、orLink server, providing HSML functionality, shall implement the HSML source functionality. 5 HSML USB Architecture 5.1 General HSML is a USB function that can transfer display data efficiently. The figure below shows the USB architecture of HSML. Two pipes are established. The control pipe is used
40、to send HSML specific requests. The framebuffer pipe is established for transmitting the uncompressed or compressed display data. The device and host will be used in this clause to refer to HSML source and HSML sink respectively because this clause mainly describes HSML in the context of USB. CE (HS
41、ML Server) HU (HSML Client)USB Device USB HostEP In (Bulk)Vendor Specific ClassEP In (Bulk)Vendor Specific ClassEP0 (Ctrl)EP0 (Ctrl)Figure 3: HSML USB Architecture 5.2 Functional Characteristics 5.2.1 General The MirrorLink server shall support at least two functions: one is HSML and the other is CD
42、C/NCM which is compliant with HSML. The MirrorLink Server shall include the HSML USB interface into the same USB configuration as the CDC/NCM USB interface. The HSML function is used for video transmission and the CDC/NCM is used for carrying MirrorLink traffic. 5.2.2 Interface The HSML interface sh
43、all be one of several interfaces the MirrorLink Server has in order to conform to the present document. 5.2.3 Endpoints 5.2.3.1 General The device shall contain two endpoints: Ctrl (Default) and Bulk In (Framebuffer). ETSI ETSI TS 103 544-21 V1.3.0 (2017-10)8 5.2.3.2 Default The default endpoint use
44、s the control transfers as defined in the USB specification 3. All the standard and vendor-specific requests are transmitted through this endpoint. The endpoint number shall be zero (0). 5.2.3.3 Framebuffer This endpoint is used to receive the framebuffer data from the device. This endpoint shall us
45、e bulk transfers and the direction shall be IN. The maximum packet size for USB 2.0 shall be 512 bytes and for USB 3.0 shall be 1 024 bytes. 5.3 Vendor-Specific Codes The below table defines the interface class, subclass and protocol used in the HSML interface descriptor. Table 1: Vendor-Specific Co
46、des Fields Code Description Class 0xFF Vendor specific class Subclass 0xCC CCCProtocol 0x01 HSML To comply with the present document, the device should not have another USB vendor-specific interface whose subclass field is 0xCC and protocol field is 0x01. The detail of descriptor class definition ru
47、le is following USB specification in 3. 5.4 Interface Descriptor The HSML interface descriptor is just like a standard USB interface descriptor, except some fields are dedicated to HSML as follows. Table 2: HSML Interface Descriptor Offset Fields Size (Bytes) Value Description 0 bLength 1 Number Siz
48、e of this descriptor. (9 bytes) 1 bDescriptorType 1 Constant Interface descriptor (0x04) 2 bInterfaceNumber 1 Number Number of interface 3 bAlternateSetting 1 Number Value used to select alternative setting 4 bNumEndpoints 1 Number Number of Endpoints. This number shall be 1 for a Bulk IN. 5 bInterf
49、aceClass 1 Class Interface Class Code. (0xFF) 6 bInterfaceSubClass 1 SubClass Interface Subclass Code. (0xCC) 7 bInterfaceProtocol 1 Protocol Interface Protocol Code. (0x01) 8 bInterface 1 Index Index of a string descriptor that describes this interface Standard USB interface descriptor is defined in 3. 5.5 Endpoint Descriptors The HSML interface requires 2 endpoints: one is default Control endpoint (endpoint 0), another is BULK IN endpoint as follows. ETSI ETSI TS 103 544-21 V1.3.0 (2017-10)9 Table 3: HSML Bulk IN Endpoint Descriptor Offs
