Miracast-Specification-v2.2双语翻译对照版/中文版

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Used with the permission of Wi-Fi Alliance under the terms as stated in this document.

Miracast

Specification

Version 2.2

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Miracast

Specification

Version 2.2

©2021Wi-FiAlliance.AllRightsReserved.在Wi-FiAlliance的许可下根据本文档中所

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趣卡翻译（fanyi.qukaa.com）

Miracast
®
 Specification v2.2 
 
© 2021 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 198 
Table of contents 
1  INTRODUCTION ......................................................................................................................................... 13 
1.1  Scope .......................................................................................................................................................... 13 
1.2  References .................................................................................................................................................. 13 
2  DEFINITIONS AND ACRONYMS ............................................................................................................... 17 
2.1.1  Shall/should/may/might word usage .............................................................................................. 17 
2.1.2  Definitions ...................................................................................................................................... 17 
2.1.3  Abbreviations and acronyms .......................................................................................................... 18 
3  WFD ARCHITECTURE AND REQUIREMENTS ........................................................................................ 22 
3.1  WFD Source, Primary Sink, Secondary Sink and WFD Session................................................................ 22 
3.1.1  WFD Source ................................................................................................................................... 23 
3.1.2  WFD Sink(s) ................................................................................................................................... 23 
3.1.3  Requirements for WFD Devices under Coupled Sink Operation ................................................... 25 
3.1.4  WFD Session ................................................................................................................................. 25 
3.2  WFD Connection Topology ......................................................................................................................... 26 
3.2.1  Wi-Fi Direct .................................................................................................................................... 26 
3.2.2  TDLS .............................................................................................................................................. 27 
3.2.3  Wi-Fi Infrastructure ......................................................................................................................... 27 
3.3  Functions and services ............................................................................................................................... 27 
3.3.1  Basic Wi-Fi functions and services ................................................................................................ 27 
3.3.2  Miracast specific functions and services ........................................................................................ 28 
3.4  Encoder/decoder characteristics ................................................................................................................. 29 
3.4.1  Audio .............................................................................................................................................. 29 
3.4.2  Video and Image Codecs ............................................................................................................... 31 
3.4.3  Stereoscopic 3D video ................................................................................................................... 36 
4  WFD SESSION FUNCTIONAL DESCRIPTION AND PROCEDURES ...................................................... 37 
4.1  Reference Model ......................................................................................................................................... 37 
4.2  WFD connection setup, WFD session establishment and management functions .................................... 38 
4.3  WFD R1 Discovery ...................................................................................................................................... 39 
4.3.1  WFD R1 Service Discovery ........................................................................................................... 39 
4.3.2  WFD R1 Device Discovery ............................................................................................................ 39 
4.4  WFD R2 Discovery ...................................................................................................................................... 40 
4.4.1  WFD R2 Service Discovery ........................................................................................................... 41 
4.4.2  WFD R2 Device Discovery ............................................................................................................ 41 
4.5  WFD Connection Setup .............................................................................................................................. 42 
4.5.1  Connectivity Scheme Resolution ................................................................................................... 42 
4.5.2  Establishing a WFD Connection using Wi-Fi Direct ....................................................................... 43 
4.5.3  Establish a WFD Connection using TDLS ..................................................................................... 45 
4.5.4  Establishing a TCP connection ...................................................................................................... 45 
4.6  WFD Capability Negotiation ........................................................................................................................ 46 
4.7  Link content protection setup ...................................................................................................................... 47 
4.8  WFD session establishment ....................................................................................................................... 49 
4.8.1  WFD Session between WFD R2 devices over a BSS infrastructure connection .......................... 51 
4.8.2  WFD Session between a WFD R2 Device and a WFD R1 Device ............................................... 53 
4.9  Coupled Sink Operation .............................................................................................................................. 53 
4.9.1  Primary and Secondary Sink Coupling .......................................................................................... 54 
4.9.2  WFD Device Discovery .................................................................................................................. 56 
4.9.3  WFD Service Discovery ................................................................................................................. 56 
4.9.4  WFD Device Pairing ....................................................................................................................... 56 
4.9.5  WFD capability negotiation ............................................................................................................ 57 
4.9.6  WFD Session establishment .......................................................................................................... 57 
4.10  AV streaming and control ............................................................................................................................ 57 
4.10.1  Time synchronization .................................................................................................................... 57 
4.10.2  AV streaming ................................................................................................................................. 58 
4.10.3  AV Encoding Rate Control ............................................................................................................ 60 
Miracast
®
 Specification v2.2 
 
1  INTRODUCTION ......................................................................................................................................... 13 
1.1  Scope .......................................................................................................................................................... 13 
1.2  References .................................................................................................................................................. 13 
2 
2.1.1 
2.1.2  Definitions ...................................................................................................................................... 17 
2.1.3 
3 
3.1 
3.1.1  WFD Source ................................................................................................................................... 23 
3.1.2  WFD Sink(s) ................................................................................................................................... 23 
3.1.3 
3.1.4  WFD Session ................................................................................................................................. 25 
3.2 
3.2.1  Wi-Fi Direct .................................................................................................................................... 26 
3.2.2  TDLS .............................................................................................................................................. 27 
3.2.3  Wi-Fi Infrastructure ......................................................................................................................... 27 
3.3 
3.3.1 
3.3.2 
3.4  Encoder/decoder characteristics ................................................................................................................. 29 
3.4.1  Audio .............................................................................................................................................. 29 
3.4.2 
3.4.3 
4 
4.1 
4.2 
4.3  WFD R1 Discovery ...................................................................................................................................... 39 
4.3.1 
4.3.2 
4.4  WFD R2 Discovery ...................................................................................................................................... 40 
4.4.1 
4.4.2 
4.5 
4.5.1 
4.5.2 
4.5.3 
4.5.4 
4.6 
4.7 
4.8 
4.8.1 
4.8.2 
4.9 
4.9.1 
4.9.2 
4.9.3 
4.9.4 
4.9.5 
4.9.6 
4.10 
4.10.1 
4.10.2 
4.10.3 
©2021Wi-Fi联盟.AllRightsReserved.在Wi-FiAlliance的许可下，根据本文档中所述
的条款使用。
第3页，共198页
目录
定义及首字母缩略词......17
Shall/should/may/might用词.17
缩略语和首字母缩略词.18
WFD体系结构和要求.......22
WFD源、主接收器、次接收器和WFD会话................................................................22
WFD器件在耦合接收器操作下的要求.....25
WFD连接拓扑结构......26
职能及服务......27
基本Wi-Fi功能和服务......27
Miracast特定功能和服务.28
视频和图像编解码器......31
立体3D视频.......36
WFD会话功能描述和程序...37
参考模型......37
WFD连接建立、WFD会话建立和管理功能...38
WFDR1服务发现...39
WFDR1设备发现......39
WFDR2服务发现...41
WFDR2设备发现......41
WFD连接设置...42
连接方案解析...42
使用Wi-Fi直连建立WFD连接......43
使用TDLS建立WFD连接.........................................................................45
建立TCP连接......45
WFD能力协商...46
链路内容保护设置..47
WFD会话建立...49
BSS基础设施连接上WFDR2设备之间的WFD会话....51
WFDR2设备和WFDR1设备之间的WFD会话.53
耦合接收器操作...53
初级和次级散热器耦合.54
WFD设备发现...56
WFD服务发现......56
WFD设备配对......56
WFD能力协商...57
WFD会话建立.......57
AV流和控制.57
时间同步......57
AV流媒体......58
AV编码速率控制......60
趣卡翻译（fanyi.qukaa.com）

Miracast
®
 Specification v2.2 
 
© 2021 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 198 
4.10.4  AV Session Control ....................................................................................................................... 62 
4.10.5  WFD video recovery...................................................................................................................... 62 
4.10.6  Switching of Transport Protocol in a WFD Session ...................................................................... 62 
4.11  User Input Back Channel ............................................................................................................................ 65 
4.11.1  UIBC Data Encapsulation ............................................................................................................. 66 
4.11.2  UIBC Establishment and Maintenance ......................................................................................... 67 
4.11.3  UIBC Input Body ........................................................................................................................... 68 
4.12  WFD Session and WFD Connection Termination ...................................................................................... 72 
4.12.1  Termination of a WFD Connection Using Wi-Fi Direct ................................................................. 72 
4.12.2  Termination of a WFD Connection Using TDLS ........................................................................... 72 
4.12.3  Termination of WFD connection Using BSS infrastructure ........................................................... 72 
4.13  Persistent WFD Groups .............................................................................................................................. 72 
4.13.1  Persistent WFD Group over Wi-Fi Direct ...................................................................................... 73 
4.13.2  Persistent WFD Group over TDLS ................................................................................................ 73 
4.14  WFD MAC Procedures -- Concurrency ....................................................................................................... 73 
4.14.1  Concurrent WLAN access with Wi-Fi Direct ................................................................................. 73 
4.14.2  Concurrent WLAN access with TDLS ........................................................................................... 73 
4.15  WFD Standby .............................................................................................................................................. 73 
4.16  Direct Streaming and Transport of Auxiliary Streams ................................................................................. 75 
4.16.1  Overview ....................................................................................................................................... 76 
4.16.2  Capability Negotiation and Session Setup .................................................................................... 76 
4.16.3  AV Streaming Switch .................................................................................................................... 78 
4.16.4  Auxiliary Stream over MPEG2-TS ................................................................................................ 80 
4.17  Backward Compatibility ............................................................................................................................... 80 
4.17.1  Device/Service Discovery ............................................................................................................. 80 
4.17.2  WFD Connection Establishment ................................................................................................... 81 
4.17.3  WFD Capability Negotiation .......................................................................................................... 81 
4.17.4  WFD Session Establishment ........................................................................................................ 81 
5  FRAME FORMATS AND SERVICE DISCOVERY INFORMATION ........................................................... 82 
5.1  WFD Information Element ........................................................................................................................... 82 
5.1.1  WFD IE Format .............................................................................................................................. 82 
5.1.2  WFD Device Information Subelement ............................................................................................ 83 
5.1.3  Associated BSSID Subelement ..................................................................................................... 85 
5.1.4  Coupled Sink Information Subelement .......................................................................................... 85 
5.1.5  WFD Video Formats Subelement .................................................................................................. 85 
5.1.6  WFD 3D Video Formats Subelement............................................................................................. 91 
5.1.7  WFD Audio Formats Subelement .................................................................................................. 91 
5.1.8  WFD Extended Capability Subelement.......................................................................................... 93 
5.1.9  Local IP Address Subelement ........................................................................................................ 94 
5.1.10  WFD Session Information Subelement ......................................................................................... 94 
5.1.11  Alternative MAC Address Subelement.......................................................................................... 95 
5.1.12  WFD R2 Device Information Subelement ..................................................................................... 96 
5.2  Management Frames .................................................................................................................................. 96 
5.2.1  Beacon Frame Format ................................................................................................................... 97 
5.2.2  Probe Request Frame Format ....................................................................................................... 97 
5.2.3  Probe Response Frame ................................................................................................................. 98 
5.2.4  Association/Reassociation Request Frame ................................................................................... 98 
5.2.5  Association/Reassociation Response Frame ................................................................................ 99 
5.2.6  Wi-Fi Direct Public Action Frames ................................................................................................. 99 
5.2.7  Service Discovery Action Frames ................................................................................................ 103 
5.3  WFD R2 Command ................................................................................................................................... 103 
5.4  WFD R2 Service Discovery Information ................................................................................................... 103 
5.4.1  WFD R2 Video Formats ............................................................................................................... 104 
5.4.2  WFD R2 Aux Stream Formats ..................................................................................................... 111 
5.4.3  WFD R2 Audio Formats ............................................................................................................... 112 
5.4.4  WFD R2 Extended Capabilities bitmap........................................................................................ 115 
5.5  TXT Record ............................................................................................................................................... 116 
Miracast
®
 Specification v2.2 
 
4.10.4 
4.10.5 
4.10.6 
4.11 
4.11.1 
4.11.2 
4.11.3 
4.12 
4.12.1 
4.12.2 
4.12.3 
4.13 
4.13.1 
4.13.2 
4.14 
4.14.1 
4.14.2 
4.15  WFD Standby .............................................................................................................................................. 73 
4.16 
4.16.1  Overview ....................................................................................................................................... 76 
4.16.2 
4.16.3 
4.16.4 
4.17 
4.17.1  Device/Service Discovery ............................................................................................................. 80 
4.17.2 
4.17.3 
4.17.4 
5 
5.1 
5.1.1 
5.1.2 
5.1.3  Associated BSSID Subelement ..................................................................................................... 85 
5.1.4 
5.1.5 
5.1.6 
5.1.7 
5.1.8 
5.1.9 
5.1.10 
5.1.11 
5.1.12 
5.2 
5.2.1 
5.2.2 
5.2.3 
5.2.4 
5.2.5 
5.2.6 
5.2.7 
5.3  WFD R2 Command ................................................................................................................................... 103 
5.4 
5.4.1 
5.4.2 
5.4.3 
5.4.4 
5.5  TXT Record ............................................................................................................................................... 116 
©2021Wi-Fi联盟.AllRightsReserved.在Wi-FiAlliance的许可下根据本文档中所述的
条款使用。
第4页，共198页
AV会话控制......62
WFD视频恢复......62
WFD会话中传输协议的切换.62
用户输入反向信道....65
UIBC数据封装..............................................................................................66
UIBC的建立和维护.67
UIBC输入体..68
WFD会话和WFD连接终止...72
使用Wi-Fi直连的WFD连接的终止.....72
使用TDLS终止WFD连接...72
使用BSS基础设施终止WFD连接...72
持久WFD组......72
Wi-Fi直连上的持久WFD组...73
TDLS上的持久WFD组......73
WFDMAC程序-并发性....73
通过Wi-FiDirect同时进行WLAN接入...73
使用TDLS的并发WLAN接入.......73
辅助流的直接流传输和传输......75
能力协商和会话设置...76
AV流媒体开关...78
MPEG2-TS上的辅助流................................................................................................80
向后兼容性.......80
WFD连接建立...81
WFD能力协商......81
WFD会话建立.......................................................................................81
框架格式和服务发现信息......82
WFD信息元素...82
WFDIE格式......82
WFD设备信息子元素......83
耦合接收器信息子单元...85
WFD视频转换器子元素......85
WFD3D视频转换器子元素......91
WFD音频转换器子元件....................................................................................91
WFD扩展能力子元素...93
本地IP地址子元素...94
WFD会话信息子元素......94
备用MAC地址子元素...95
WFDR2设备信息子元素.......96
管理框架..........................................................................................................96
信标帧格式.97
探测请求帧格式.......97
探测响应帧...98
关联/重新关联请求帧......98
关联/重新关联响应帧......99
Wi-Fi直连公共行动帧.......99
服务发现操作帧......103
WFDR2服务发现信息......103
WFDR2视频解码器......104
WFDR2辅助流控制器...111
WFDR2音频解码器...112
WFDR2扩展功能位图.115
趣卡翻译（fanyi.qukaa.com）

Miracast
®
 Specification v2.2 
 
© 2021 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 198 
RTSP BASED WFD CONTROL PLANE ................................................................................................... 118 
1  RTSP data structures ................................................................................................................................ 118 
1.1  ABNF Definitions .......................................................................................................................... 118 
1.2  wfd-audio-codecs ......................................................................................................................... 118 
1.3  wfd-video-formats ......................................................................................................................... 119 
1.4  wfd-3d-formats ............................................................................................................................. 120 
1.5  wfd-content-protection ................................................................................................................. 120 
1.6  wfd-display-edid ........................................................................................................................... 120 
1.7  wfd-coupled-sink .......................................................................................................................... 122 
1.8  wfd-trigger-method ....................................................................................................................... 122 
1.9  wfd-presentation-url ..................................................................................................................... 122 
1.10  wfd-client-rtp-ports ...................................................................................................................... 123 
1.11  wfd-route ..................................................................................................................................... 124 
1.12  wfd-I2C ........................................................................................................................................ 124 
1.13  wfd-av-format-change-timing ...................................................................................................... 124 
1.14  wfd-preferred-display-mode ........................................................................................................ 125 
1.15  wfd-uibc-capability....................................................................................................................... 125 
1.16  wfd-uibc-setting ........................................................................................................................... 125 
1.17  wfd-standby-resume-capability ................................................................................................... 125 
1.18  wfd-standby ................................................................................................................................. 126 
1.19  wfd-connector-type...................................................................................................................... 126 
1.20  wfd-idr-request ............................................................................................................................ 127 
1.21  wfd2-audio-codecs ...................................................................................................................... 127 
1.22  wfd2-video-formats...................................................................................................................... 127 
1.23  wfd2-aux-stream-formats ............................................................................................................ 128 
1.24  wfd2-direct-streaming-mode ....................................................................................................... 129 
1.25  wfd2-transport-switch .................................................................................................................. 129 
1.26  wfd2-buffer-length ....................................................................................................................... 129 
1.27  wfd2-audio-playback-status ........................................................................................................ 130 
1.28  wfd2-video-playback-status ........................................................................................................ 130 
1.29  wfd2-cta-datablock-collection ...................................................................................................... 131 
1.30  wfd2-cta-audio-infoframe ............................................................................................................ 133 
2  WFD RTSP methods ................................................................................................................................. 133 
2.1  WFD RTSP OPTIONS ................................................................................................................. 133 
2.2  GET_PARAMETER ..................................................................................................................... 135 
2.3  SET_PARAMETER ...................................................................................................................... 135 
2.4  SETUP ......................................................................................................................................... 136 
2.5  PLAY ............................................................................................................................................ 136 
2.6  PAUSE ......................................................................................................................................... 137 
2.7  TEARDOWN ................................................................................................................................ 137 
3  RTSP Parameters ..................................................................................................................................... 137 
4  RTSP Messages ....................................................................................................................................... 139 
4.1  RTSP M1 Message ...................................................................................................................... 141 
4.2  RTSP M2 Message ...................................................................................................................... 141 
4.3  RTSP M3 Message ...................................................................................................................... 142 
4.4  RTSP M4 Message ...................................................................................................................... 142 
4.5  RTSP M5 Message ...................................................................................................................... 144 
4.6  RTSP M6 Message ...................................................................................................................... 145 
4.7  RTSP M7 Message ...................................................................................................................... 145 
4.8  RTSP M8 Message ...................................................................................................................... 146 
4.9  RTSP M9 Message ...................................................................................................................... 146 
4.10  RTSP M10 Message ................................................................................................................... 147 
4.11  RTSP M11 Message ................................................................................................................... 147 
4.12  RTSP M12 Message ................................................................................................................... 147 
4.13  RTSP M13 Message ................................................................................................................... 147 
4.14  RTSP M14 Message ................................................................................................................... 148 
4.15  RTSP M15 Message ................................................................................................................... 148 
4.16  RTSP M16 Message ................................................................................................................... 149 
Miracast
®
 Specification v2.2 
 

1 
1.1  ABNF Definitions .......................................................................................................................... 118 
1.2  wfd-audio-codecs ......................................................................................................................... 118 
1.3  wfd-video-formats ......................................................................................................................... 119 
1.4  wfd-3d-formats ............................................................................................................................. 120 
1.5  wfd-content-protection ................................................................................................................. 120 
1.6  wfd-display-edid ........................................................................................................................... 120 
1.7  wfd-coupled-sink .......................................................................................................................... 122 
1.8  wfd-trigger-method ....................................................................................................................... 122 
1.9  wfd-presentation-url ..................................................................................................................... 122 
1.10  wfd-client-rtp-ports ...................................................................................................................... 123 
1.11  wfd-route ..................................................................................................................................... 124 
1.12  wfd-I2C ........................................................................................................................................ 124 
1.13  wfd-av-format-change-timing ...................................................................................................... 124 
1.14  wfd-preferred-display-mode ........................................................................................................ 125 
1.15  wfd-uibc-capability....................................................................................................................... 125 
1.16  wfd-uibc-setting ........................................................................................................................... 125 
1.17  wfd-standby-resume-capability ................................................................................................... 125 
1.18  wfd-standby ................................................................................................................................. 126 
1.19  wfd-connector-type...................................................................................................................... 126 
1.20  wfd-idr-request ............................................................................................................................ 127 
1.21  wfd2-audio-codecs ...................................................................................................................... 127 
1.22  wfd2-video-formats...................................................................................................................... 127 
1.23  wfd2-aux-stream-formats ............................................................................................................ 128 
1.24  wfd2-direct-streaming-mode ....................................................................................................... 129 
1.25  wfd2-transport-switch .................................................................................................................. 129 
1.26  wfd2-buffer-length ....................................................................................................................... 129 
1.27  wfd2-audio-playback-status ........................................................................................................ 130 
1.28  wfd2-video-playback-status ........................................................................................................ 130 
1.29  wfd2-cta-datablock-collection ...................................................................................................... 131 
1.30  wfd2-cta-audio-infoframe ............................................................................................................ 133 
2  WFD RTSP methods ................................................................................................................................. 133 
2.1  WFD RTSP OPTIONS ................................................................................................................. 133 
2.2  GET_PARAMETER ..................................................................................................................... 135 
2.3  SET_PARAMETER ...................................................................................................................... 135 
2.4  SETUP ......................................................................................................................................... 136 
2.5  PLAY ............................................................................................................................................ 136 
2.6  PAUSE ......................................................................................................................................... 137 
2.7  TEARDOWN ................................................................................................................................ 137 
3  RTSP Parameters ..................................................................................................................................... 137 
4  RTSP Messages ....................................................................................................................................... 139 
4.1  RTSP M1 Message ...................................................................................................................... 141 
4.2  RTSP M2 Message ...................................................................................................................... 141 
4.3  RTSP M3 Message ...................................................................................................................... 142 
4.4  RTSP M4 Message ...................................................................................................................... 142 
4.5  RTSP M5 Message ...................................................................................................................... 144 
4.6  RTSP M6 Message ...................................................................................................................... 145 
4.7  RTSP M7 Message ...................................................................................................................... 145 
4.8  RTSP M8 Message ...................................................................................................................... 146 
4.9  RTSP M9 Message ...................................................................................................................... 146 
4.10  RTSP M10 Message ................................................................................................................... 147 
4.11  RTSP M11 Message ................................................................................................................... 147 
4.12  RTSP M12 Message ................................................................................................................... 147 
4.13  RTSP M13 Message ................................................................................................................... 147 
4.14  RTSP M14 Message ................................................................................................................... 148 
4.15  RTSP M15 Message ................................................................................................................... 148 
4.16  RTSP M16 Message ................................................................................................................... 149 
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