Wi-Fi_Display_Technical_Specification_v2.1_0(2017年

文件名称: Wi-Fi_Display_Technical_Specification_v2.1_0(2017年更新版本)

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详细说明：WIFI DISPLAY的技术文档2017年7月31日更新版本，能找到的话官网也可以下载的Wi-Fi Display Technical Specification V2. NiFi Table of contents INTRODUCTION cope 1.2 References 2 DEFINITIONS AND ACRONYMS 音国 .15 2.1.1 Shall/should/may/might word usage 2.1.2 Definitions 2.1.3 Abbreviations and acronyms 11国面 16 3 WFD ARCHITECTURE AND REQUIREMENTS 20 3.1 WFD Source, Primary Sink, Secondary Sink and WFD Session 3.1.1 WFD Source 面国面国面B 3.1.2 WED Sink(s)…… ,21 3.1.3 Requirements for WFD Devices under Coupled Sink Operation 23 3. 1. 4 WFD Session 3.2 WFD Connection Topology 3.2.1Wi-FiP2P.… 24 3.2.2 TDLS 3.2.3 Wi-Fi Infrastructure Functions and services 3.3.1 Basic Wi-Fi functions and services 3.3.2 Wi-Fi Display specific functions and services 26 3.4 Encoder/decoder characteristics 3.4.1Aud 27 3.4.2 Video and Image Codecs 29 3.4.3 Stereoscopic 3D video .34 4 WFD SESSION FUNCTIONAL DESCRIPTION AND PROCEDURES 35 4.1 Reference model WFD connection setup, WFD session establishment and management functions WFDR1 Discovery……,,…… 37 4.3.1 WFD R1 Service Discovery 37 4.3.2 WFD R1 Device Discovery 4.4 WFD R2 Discovery 画,11 38 4. 4.1 WFD R2 Service Discovery 4.4.2 WFD R2 Device Discovery 4.5 WFD Connection Setup… 40 4.5. 1 Connectivity Scheme Resolution 4.5.2 Establishing a WFD Connection using Wi-Fi P2P 4 4.5.3 Establish a WFD Connection using TDLS 43 4.5. 4 Establishing a T CP connection 43 WFD Capability Negotiation 44 Link content protection setup 4.8 WFD Session establishment 48.1 WFD Session between wfd r2 devices over a bss infrastructure connection 49 482 WFD Session between a wfd r2 device and a wed r1 device 4.9 Coupled Sink Operation 51 4.9.1 Primary and Secondary Sink Coupling 52 4.9.2 WFD Device Discovery 54 4.9.3 WFD Service Discovery 4.9.4 WFD Device Pairing …54 4.9.5 WFd capability negotiation 55 49.6 WFD Session establishment 4.10 AV streaming and control .55 4.10.1 Time synchronization 4.10.2 AV streaming.… 4.10.3 AV Encoding Rate Control 58 C 2017 Wi-Fi Alliance. All Rights Reserved Used with the permission of Wi-Fi Alliance under the terms as stated in this document Page 3 of 196 Wi-Fi Display Technical Specification V2. NiFi 4.10.4 AV Session Control .60 4.10.5 WFD video recovery 4. 10.6 Switching of Transport Protocol in a WFDS Session 60 4.11 User Input Back Channel .63 4.11.1 UlBC Data Encapsulation 64 4.11.2 UIBC Establishment and maintenance 4.11.3 UIBC Input Body 66 4.12 WFD Session and wfd Connection termination 70 4.12.1 Termination of a WFD Connection Using Wi-Fi P2P 70 4. 12.2 Termination of a WFD Connection Using TDLS 70 4.12.3 Termination of WFD connection Using BSS infrastructure 70 4.13 Persistent WFD Groups 70 4.13.1 Persistent WFD Group over Wi-Fi P2P 4.13.2 Persistent Wfd Group over TDLS 71 4.14 WFD MAC Procedures --Concurrency 71 4.14.1 Concurrent Wlan access with Wi-Fi P2P 71 4.14.2 Concurrent Wlan access with TDls 4.15 WFD Standby 1翻国 4.16 Direct Streaming and Transport of Auxiliary Streams 73 4.161 Overview 74 4. 16.2 Capability Negotiation and Session Setup 74 4. 16.3 AV Streaming Switch 76 4. 16.4 Auxiliary Stream over MPEG2-Ts 78 4.17 Backward Compatibility 78 4.17.1 DeviceService Discovery 78 4.17.2 WFD Connection establishment 4. 17.3 WFD Capability Negotiation 79 4.17. 4 WED Session establishment 79 5 FRAME FORMATS AND SERVICE DISCOVERY INFORMATION .80 5.1 WFD Information element 80 5.1.2 WFD Device Information subelement 80 :a.a:.a:a日.:.::::aaa::a::.: 81 5.1.3 Associated bssid Subelement 83 5.1.4 Coupled Sink Information Subelement 83 5.1.5 WFD Video formats subelement 5.1.6 WFd 3D Video formats subelement 5.1.7 WED Audio formats subelement 89 5.1.8 WFD Extended Capability subelement 画主1面国面量面 5.19 Local iP Address subelement .92 5.1.10 WED Session Information subelement 5.1.11 Alternative MAc Address subelement 93 5.1.12 WFD R2 Device Information Subelement 94 5.2 Management Frames 94 5.2.1 Beacon frame format 5.2.2 Probe Request Frame Format ,,, 5.2.3 Probe Response Frame 9E 5. 2.4 Association/Reassociation Request Frame ∴96 5.2.5 Association/Reassociation Response Frame 5.2.6 P2P Public Action frames 97 5.2.7 Service Discovery Action Frames 101 WFD R2 Command 101 54 WFD R2 Service Discovery Information 101 5.41 WFD R2 Video formats 1B国国面1面B面面面B面 102 5.4.2 WFD R2 Aux Stream formats 1画 109 5.4.3 WFD R2 Audio Formats 110 5.4.4 WFD R2 Extended Capabilities bitmap 113 55 TXT Record .114 C 2017 Wi-Fi Alliance. All Rights Reserved Used with the permission of Wi-Fi Alliance under the terms as stated in this document Page 4 of 196 Wi-Fi Display Technical Specification V2. NiFi 6 RTSP BASED WED CONTROL PLANE 116 6.1 rtsP data structures 116 6.1.1 ABNF Definitions 116 6.1.2 Wfd-audio-codecs 面国面国国国国1 116 6.1.3 wfd-video-formats 6.1 4 Wfd-3d-formats 118 6.1.5 Wfd-content-protection 118 6. 1.6 wtd-display-edid 118 6.1.7 Wfd-coupled-sink 120 6.1.8 Wfd-trigger- method 120 6. 1. 9 Wfd-presentation-url 120 6. 1.10 Wfd-client-rtp-ports 121 6.1.11Wfd- route∴…………. 6.1.12Wfd-|2c 122 6.1.13 Wfd-av-format-change-timing 122 6.1.14 Wfd-preferred-display-mode 6.1.15 wfd-uibc-capability 123 6.1.16 Wtd-uibc-setting 面BE 123 6.1.17 Wfd-standby-resume-capability 123 6.1.18 wfd-standby …124 6.1.19 wfd-connector-type 124 6. 1.20 Wfd-idr-req 6.121 wfd2-audio-codecs 125 6.1.22 wfd2-video-formats 翻国面面面1国面 125 6.123 wfd2-aux-stream-formats ..126 6.1.24 wfd2-direct-streaming-mode 127 6. 1.25 Wfd2-transport-switch 127 6.1.26 wfd2-buffer-length 127 6. 1.27 wfd2-audio-playback-status 128 6. 1.28 wfd2-video-playback-status 128 6.1.29 Wfd2-cta-datablock-collection 6.1.30 wtd2-cta-audio-infoframe 131 6.2 WED RTSP methods 6.2.1 WFD RTSP OPTIONS 131 6.2.2 GET PARAMETER 133 6.2.3 SET PARAMETER 133 6.2.4 SETUP ∴134 6.2.5PLAY. 134 6.2.6 PAUSE B国面 135 6.2.7 TEARDOWN …135 RTSP Parameters 135 64 RTSP Messages∴ 1 137 6.4.1 RTSP M1 Message 139 6.4.2 RTSP M2 Message …139 6.4.3 RTSP M3 Message 140 6.4 4 RTSP M4 Message 140 6.4.5 RTSP M5 Message 1442 6.4.6 RTSP M6 Message 143 6.4.7 RTSP M7 Message 4 6.4.8 RTSP M8 Message 144 6. 4.9 RTSP M9 Message 144 64.10 RTSP M10 Message…………………………… 145 6.4.11 RTSP M11 Message 145 6.4.12 RTSP M12 Message 145 6.4.13 RTSP M13 Message 145 6.4.14 RTSP M14 Message 146 6.4.15 RTSP M15 Message L国面国面 ………146 6.4.16 RTSP M16 Message.... 147 C 2017 Wi-Fi Alliance. All Rights Reserved Used with the permission of Wi-Fi Alliance under the terms as stated in this document Page 5 of 196 Wi-Fi Display Technical Specification V2. NiFi 65 RTSP Timeout 147 6.5.1 WFD keep-alive 147 6.5.2 Timeout before rtsP procedure 148 6.6 RTSP Syntax remark 国面面着国国1面 148 6.6.1 CSeq 148 6.6.2 Delimiter for parameters 148 6.6.3 Message header 149 6.6. 4 Content-Encoding .149 6.6.5 Case Sensitivity 149 6.6.6 Content-Length and Content-Type 7 REMOTE 12C READRITE MESSAGING TRANSACTION 150 7.1 Remote 12C_ Read Request 15 7.2 Remote 2C Write request Remote|2 C Read Reply_ AcK.……… 151 152 74 Remote_ 12C_ Read Reply_ Nak 152 75 Remote 2C Write Reply Ack 152 7.6 Remote 12C_ Write Reply_ Nak 153 8 PREFERREd DISPLAY MODE 154 APPENDIX A MPEG SYSTEM LAYER (INFORMATIVE) 155 APPENDIX B MPEG-TS PARAMETERS FOR AUDIO, VIDEO AND AUXILIARY ELEMENTARY STREAMS (NORMATIVE)156 B.1 Encapsulation of mPEG2-TS into RTP Packets 163 B.2 PES Structure and Blending Operation for Auxiliary Streams 164 B.2.1 Blending operation 167 B.2.2 Carriage of jPEG Image over mPeG2-TS transport Stream 169 B.2.3 Carriage of PNG Image over MPEG2-TS Transport Stream 170 B.3 WFD R2 LPCM Formats and Packet Structures 172 B 3. 1 PEs Structure for lPcm streams 172 B.3.2 Speaker Location Names used for Multichannel Audio Streaming 175 B 3.3 Multi-channel audio formats information .177 B.4 DTS-HD Audio bitstream Constraints .177 B.4.1 DTS-HD MPEG-TS Parameters and Requirements 177 B.4.2 DTS-HD Elementary Stream Encapsulation 178 APPENDIX C RECOMMENDATIONS FOR SATISFYING THE HDCP 2. X LOCALITY CHECK(INFORMATIVE)..179 APPENDIX D H. 264 AND H 222 USAGE DETAIL (NORMATIVE) 180 D.1 Slice Usage 180 D.1.1 Multiple slices in a Picture 180 D.2 Frame Packing arrangement se 180 D.3 SEI and vu 182 D 4 H.222 usage.… 182 D 4.1 PTS/dTS for video stream 182 D.4.2PAT/PMT… D 4.3 Program and program element descriptors in PMT .182 183 APPENDIX E RTSP MESSAGE EXAMPLES (INFORMATIVE) 185 E.1 From rtsp m1 to m7 without errors 185 RTSP M4 with error case 186 E.3 Example rtsP Messages for TCP Mode 187 APPENDIX F HDCP 2X NOTATION MAPPING TO WED DEVICE HDCP IMPLEMENTATION REVISION 191 APPENDIXG CTA AUDIO EXAMPLE( NFORMATIVE)…… 192 C 2017 Wi-Fi Alliance. All Rights Reserved Used with the permission of Wi-Fi Alliance under the terms as stated in this document Page 6 of 196 Wi-Fi Display Technical Specification V2. NiFi List of tables Table 1 Definitions 15 Table 2 Abbreviations and acronyms 16 Table 3 Functions and services 11i 26 Table 4 Optional audio codec formats 28 Table 5 List of supported audio CodEC formats for audio stream from Source to Sink in forward channel..28 Table 6 Wi-Fi Display H.264 profiles…… 29 Table 7 Video codecs and profiles applicable for transcoding mode 30 Table 8 Video codecs and profiles applicable for Non -Transcoding Mode Table 9 Codecs and profiles applicable for auxiliary streams 31 Table 10. Supported video resolutions and frame rates Table 11 Connectivity scheme resolution 国国1B面面面B面 Table 12. Connectivity resolution scheme when using Secondary Sinks 54 Table 13. Input Category Code 64 Table 14 Generic input message format 66 Table 15. Generic Input Type ID for user inputs of the Generic Category 66 Table 16 Describe Field of the generic Input message for left mouse down/Touch down Table 17. Describe Field of the Generic Input Message for Left Mouse Move/Touch Move 67 Table 18 Describe field of the generic input Message for Zoom Table 19 Describe Field of the Generic Input Message for Vertical Scroll 68 Table 20 Describe Field of the Generic Input Message for Horizontal Scroll .68 Table 21 Describe Field of the generic Input Message for rotate 68 Table 22 HIDC message format 1国 69 Table 23 HID Input Path .69 Table 24 HID Type.............. 69 Table 25 WED E Format 80 Table 26 General Format of a wfd subelement Table 27 WFD Subelement ID Definitions 80 Table 28 WFD Device Information subelement 1国日国 81 Table 29 WFD Device Information field 82 Table 30 Associated bssid subelement 83 Table 31 Coupled Sink Information Subelement Table 32 Coupled Sink Status Bitmap 8国 Table 33. WFD Video formats subelement 84 Table 34 Supported CEA Resolution/Refresh Rates 85 Table 35 Supported vESa Resolution/ Refresh Rates 5 Table 36. Supported HH Resolutions/Refresh Rates. .......86 Table 37. Display Native Resolution Refresh Rate ∴87 Table 38. Profiles Bitmap Table 39. Maximum H. 264 Level Supported 88 Table 40 Slice Encoding parameters bitmap………………… 翻量1量面 88 Table 41 Video Frame Rate Control Support Bitmap 9 Table 42 WFD Audio formats subelement Table 43 LPCM Modes bitmap Table 44 AAC Codec bitmap.…… Table 45 AC3 Modes bitmap Table 46. WFD Extended Capability Subelement Table 47 WFD EXtended Capabilities Bitmap 92 Table 48 ocal iP Address subelement 92 Table 49 WFD Session information subelement 93 Table 50 WFD Device Into Descriptor field Table 51 Alternative MAC Address Subelement 4 Table 52 WFD R2 Device Information Subelement 94 Table 53 WFD R2 Device Information .94 Table 54 WFD Subelements in a beacon frame 95 Table 55 WFD Subelements in a Probe Request Frame 95 Table 56. Tunneled Probe Request/Response 95 C 2017 Wi-Fi Alliance. All Rights Reserved Used with the permission of Wi-Fi Alliance under the terms as stated in this document Page 7 of 196 Wi-Fi Display Technical Specification V2. NiFi Table 57. WFD Subelements in a Probe Response Frame 6 Table 58. WFD Subelements in an Association/Reassociation Request Frame 97 Table 59 WFD Subelements in an Association/Reassociation Response Frame 97 Table 60 WFD Subelements in a go Negotiation Request frame 98 Table 61. WFD Subelements in a Go Negotiation Response Frame 98 Table 62. WFD Subelements in a GO Negotiation Confirmation Frame 98 Table 63 WFD Subelements in a p2P Invitation Request Frame .99 Table 64 WFD Subelements in a p2p Invitation Response frame Table 65 WFD Subelements in a Provision Discovery Request Frame .100 Table 66 WFD Subelements in a Provision discovery Response Frame 100 Table 67 WFD R2 Command .101 Table 68 WFD R2 TCP Connection Request Command 101 Table 69 ⅵFDR2 Capability Definitions used for Service Discovery Information………………… 101 Table 70 WFD R2 Video formats Information .102 Table 71. Supported CEA Resolution/Refresh Rates .103 Table 72 Supported VESA Resolution/Refresh Rates .104 Table 73. Supported HH Resolutions/Refresh Rates 105 Table 74 Display Native Resolution Refresh Rate Table 75 WFD Video Codec Info Descriptor field 106 106 Table 76. Video Codec T ype field values in WFD R2 Video Codec Info Descriptor 107 Table77 Video Codec Profile bitmap values in WFd Video Codec Info Descriptor 1面国画 107 Table 78 Video Codec Level Bitmap values in wfd R2 Video codec info descriptor 108 Table79 WFD R2 AuX Stream Formats information .109 Table 80. Aux Stream Codecs Bitmap :·: 109 Table 81 Reference Overlay Resolution Refresh Rate 110 Table 82 WFD R2 Audio formats Information 110 Table 83 LPCM Modes bitmap for wfd r2 devices 112 Table 84. CTA Audio Modes Bitmap 113 Table 85 AAC-ELDv2 Modes bitmap 113 Table 86 WFD R2 EXtended Capabilities Bitmap 114 Table 87. WFD R2 Synchronous Streaming Information field bit mapping 114 Table 88 Wfd-url0 and wfd-url1 values in wfd-presentation-url ∴121 Table 89 wfd-client-rtp-ports parameter values in M3 Response message 121 Table 90. Wfd-client-rtp-ports parameter values in M3 Response message and corresponding values in the subsequent M4/M6 Request message 122 Table 91 Display connector type field 124 Table 92 CtA data block header 129 Table 93. CTA Extended Tag Code 129 Table 94 Cta audio formats allowed in wed r2 130 Table 95. RtsP methods that the wfd source and/or wfd sink can invoke .132 Table 96 Reason Code for RTSP M4 Response in WFD 133 Table 97. Summary of RTSP parameters 1B面 135 Table 98 List of defined rtsP messages and their identifiers 138 Table 99. Remote 12C Read Request 151 Table 100. Remote 12c Write Request 152 Table 101. Remote_12C_ Read_ Reply_ Ack 152 Table 102. Remote 12C Read Reply Nak 152 Table 103. Remote_ 12C_Write Reply_ Ack 152 Table 104. Remote 2C Write Reply Nak 153 Table 105. MPEG-Ts parameters for supported audio, video and image formats 156 Table 106. PES structure and field values for 48ksps/44.1ksps 16bits 2-ch LPCM 157 Table107. PES structure and field values for Dolby Ac-3.…….…….… 158 Table 108. Pes structure and field values for e-ac-3 160 Table 109. Pes structure and field values for aac-lc 161 Table 110. RTP encapsulation of MPEg-ts 163 Table 111. pes structure and field values for auxiliary stream 164 Table 112. Alpha selection and associated blending modes 167 Table 113. JPEG stream descriptor 169 C 2017 Wi-Fi Alliance. All Rights Reserved Used with the permission of Wi-Fi Alliance under the terms as stated in this document Page 8 of 196 Wi-Fi Display Technical Specification V2. NiFi Table 114. PNG stream descriptor. 170 Table 115. pes structure for wfd r2 lPcm audio 172 Table 116. Quantization word length 174 Table 117. Audio sampling_ frequency 国面面着国国1面 174 Table 118. Number of audio channels .174 Table 119. Bitmap for the Speaker Location Names ..176 Table 120. Syncwords associated with dTS-HD audio 178 Table 121. Frame packing arrangement SEl syntax element and values at Wi-Fi Display 18 Table 122. RTSP message example-1 185 Table 123. RTSP message example-2 187 Table 124. RTSP M3 message to query available buffer length 187 Table 125. RTSP M4 and M6 messages for switching to TCP 188 Table 126. RTSP M4 and M6 message for switching to UDP 188 Table 127. RTSP M3 message for requesting audio buffer information 189 Table 128. RTSP M3 message for requesting video buffer information ...................................................189 Table 130. Example of RTSP messages to exchange CTA Audio parameters between WFD R2 Source and .7 o Table 129. HDCP 2.X Notation Mapping 91 WFD R2 Sink 192 Table 131. Data block Header Example 192 Table 132. AC-3 Short Audio Descriptor Example 193 Table 133 Enhanced Ac-3 Short Audio Descriptor Example……… 193 Table 134. dts-HD Short Audio descriptor example 193 Table 1 35. L-PCM 3D Short Audio Descriptor EXample 193 Table 136. Room Configuration Data Block Example .194 Table 137. Speaker Location Data block Example 194 Table 138. Audio InfoFrame Example 195 Table 139. Room Configuration Data Block EXample 2 195 Tabe140. Speaker Location Data Block EXample2………… 196 Table 141. Speaker Location Data Block Example 3 196 C 2017 Wi-Fi Alliance. All Rights Reserved Used with the permission of Wi-Fi Alliance under the terms as stated in this document Page 9 of 196 Wi-Fi Display Technical Specification V2. WiFi List of figures Figure 1. Logical data and control plane connections Figure 2 Example of WFD topology 21 Figure 3 Audio-only WFD Session 24 Figure 4. Video-only WFD Session 24 Fiqure 5 Audio and video wfd session 24 Figure 6 WFD Session under Coupled Sink Operation 24 Figure 7 WFD Connection using Wi-Fi P2P 25 Figure 8 TDLS S topology 25 Figure 9. Discovery and WFD connection over Wi-Fi infrastructure Figure 10. Reference model for session management in WFD devices 35 Figure11. Reference model audio/video payload processing……………… 36 igure 12 Fi Tunneled Probing when TDLS is used 1 38 Figure 13. WFD capability negotiation(or coupling) flow using RTSP Figure 14. Time-line of a WFD session Figure 15. dNs-Sd for active subscription and solicited advertising 50 Figure 16 meline of a WFD Session with a Secondary Sink 52 Figure 17. Eliminating Network Jitter using RTP 1国日国 56 Figure 18 WFD AV packet format… Figure 19. T ypical message flow for switching to TCP mode in a WFD R2 Session and switching back to UDP mode 63 Figure20. Encapsulations of User Inputs over TCP/P……… 64 Figure 2 UIBC capability negotiation 1国 …65 Figure 22. UIBC update .66 Figure 23. Overview of Audio/Video and Auxiliary Streams over MPEG2-TS 74 Figure 24. Message Sequence for Capability Negotiation to Setup Direct Streaming and Auxiliary Streams in a wed session 1面正 76 Figure 25. Message sequence for Av Streaming Switch Figure 26. Block Structure of EDid data 119 Figure 27. Triggering the WFD Sink to send an RTSP Request message 143 Figure 28 Remote 12C transaction example. 15 Example of recommended encapsulation of MPEG2-TS packets,,ng and Synchronization Figure 29. Overview of the H. 222.0 Systems Layer- Transmission, Multiplexir 155 Figure 30 163 Figure 31. Example of recommended encapsulation of MPEG2 TS packets...................164 Figure 32. Structure of JPEG Access Units in PES Packets 170 Figure 33. Structure of PNG Access Units in PES Packets Figure 34 ayout of a chunk 171 Figure 35. PES structure with X MCA frames in the payload 175 Figure 36. Typical composition of a pes payload 178 C 2017 Wi-Fi Alliance. All Rights Reserved Used with the permission of Wi-Fi Alliance under the terms as stated in this document Page 10 of 196

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