© 2012 Wi-Fi Alliance. All Rights Reserved.
Used with the permission of Wi-Fi Alliance under the terms as stated in this document.
Wi-Fi Display
Technical Specification
Version 1.1
This document is the specification for the Wi-Fi Alliance Wi-Fi CERTIFIED Miracast® program, a
solution for wireless video streaming.
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This document may be used with the permission of Wi-Fi Alliance under the terms set forth herein.
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Wi-Fi Display Technical Specification - Version 1.1
© 2012 Wi-Fi Alliance. All Rights Reserved.
Used with the permission of Wi-Fi Alliance under the terms as stated in this document.
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Document History
Version
Date
Notes
v1.0
8/24/2012
Public release version
v1.1
4/24/2014
Public release version
- Updated to incorporate Wi-Fi Display Technical Specification Addendum
version 0.0.10 to support HDCPv2.2
- Editorial changes for clarification
Wi-Fi Display Technical Specification - Version 1.1
© 2012 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 151
Table of Contents
Table of Contents ........................................................................................................................................... 3
1 Introduction ...........................................................................................................................................11
1.1 Scope of This Document ...............................................................................................................11
2 Definitions .............................................................................................................................................12
2.1 Abbreviations ................................................................................................................................12
3 WFD Architecture and Requirements ...................................................................................................15
3.1 WFD Source, Primary Sink, Secondary Sink and WFD Session ..................................................17
3.1.1 WFD Source ..........................................................................................................................17
3.1.2 WFD Sink(s) ..........................................................................................................................17
3.1.2.1 Primary Sink: .....................................................................................................................17
3.1.2.2 Secondary Sink: .................................................................................................................18
3.1.3 Requirements for WFD Devices under Coupled Sink Operation ..........................................19
3.1.4 WFD Session .........................................................................................................................20
3.2 WFD Connection Topology ..........................................................................................................21
3.2.1 Wi-Fi P2P ..............................................................................................................................21
3.2.2 TDLS .....................................................................................................................................21
3.3 Functions and Services ..................................................................................................................21
3.3.1 Basic Wi-Fi Functions and Services ......................................................................................21
3.3.2 Wi-Fi Display Specific Functions and Services ....................................................................22
3.4 Encoder/Decoder Characteristics ...................................................................................................23
3.4.1 Audio .....................................................................................................................................23
3.4.2 Video .....................................................................................................................................24
3.4.3 Stereoscopic 3D video ...........................................................................................................27
4 WFD Session – Functional Description and Procedures .......................................................................29
4.1 Reference Model............................................................................................................................29
4.2 WFD Connection Setup, WFD Session Establishment and Management Functions ....................30
4.3 WFD Device Discovery .................................................................................................................31
4.4 WFD Service Discovery ................................................................................................................32
4.5 WFD Connection Setup .................................................................................................................32
4.5.1 Connectivity Scheme Resolution ...........................................................................................33
4.5.2 Establishing a WFD Connection using Wi-Fi P2P ................................................................34
4.5.2.1 Usage of a WFD IE to establish P2P connection ...............................................................34
4.5.3 Establish a WFD Connection using TDLS ............................................................................35
4.5.4 Establishing a TCP connection ..............................................................................................35
4.6 WFD Capability Negotiation .........................................................................................................36
4.7 Link Content Protection Setup .......................................................................................................37
4.8 WFD Session Establishment..........................................................................................................38
4.9 Coupled Sink Operation ................................................................................................................40
4.9.1 Primary and Secondary Sink Coupling ..................................................................................43
4.9.2 WFD Device Discovery .........................................................................................................44
4.9.3 WFD Service Discovery ........................................................................................................44
4.9.4 WFD Device Pairing .............................................................................................................45
4.9.5 WFD Capability Negotiation .................................................................................................45
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Used with the permission of Wi-Fi Alliance under the terms as stated in this document.
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4.9.6 WFD Session Establishment ..................................................................................................45
4.10 AV Streaming and Control ............................................................................................................46
4.10.1 Time Synchronization ............................................................................................................46
4.10.2 AV Streaming ........................................................................................................................47
4.10.3 AV Encoding Rate Control ....................................................................................................49
4.10.3.1 Video Frame skipping ....................................................................................................49
4.10.3.2 Explicit AV format change ............................................................................................50
4.10.4 AV Session Control ...............................................................................................................51
4.10.5 WFD video recovery .............................................................................................................51
4.11 User Input Back Channel ...............................................................................................................51
4.11.1 UIBC Data Encapsulation ......................................................................................................51
4.11.2 UIBC Establishment and Maintenance ..................................................................................52
4.11.3 UIBC Input Body ...................................................................................................................54
4.11.3.1 Generic Input Body Format ...........................................................................................54
4.11.3.2 HIDC Input Body Format ..............................................................................................58
4.12 WFD Session and WFD Connection Termination .........................................................................59
4.12.1 Termination of a WFD Connection Using Wi-Fi P2P ...........................................................60
4.12.2 Termination of a WFD Connection Using TDLS ..................................................................60
4.13 Persistent WFD Groups .................................................................................................................60
4.13.1 Persistent WFD Group over Wi-Fi P2P .................................................................................60
4.13.2 Persistent WFD Group over TDLS ........................................................................................60
4.13.2.1 Formation of a Persistent WFD Group over TDLS .......................................................60
4.13.2.2 Operation of a Persistent WFD Group over TDLS ........................................................61
4.13.2.3 Termination of a Persistent WFD Group over TDLS ....................................................61
4.14 WFD MAC Procedures -- Concurrency ........................................................................................62
4.14.1 Concurrent WLAN access with Wi-Fi P2P ...........................................................................62
4.14.2 Concurrent WLAN access with TDLS ..................................................................................62
4.15 WFD Standby ................................................................................................................................62
5 Frame Formats .......................................................................................................................................65
5.1 WFD Information Element ............................................................................................................65
5.1.1 WFD IE Format .....................................................................................................................65
5.1.2 WFD Device Information Subelement ..................................................................................66
5.1.3 Associated BSSID Subelement ..............................................................................................68
5.1.4 Coupled Sink Information Subelement ..................................................................................68
5.1.4.1 Coupled Sink Status Bitmap ..............................................................................................69
5.1.5 WFD Video Formats Subelement ..........................................................................................69
5.1.5.1 CEA Resolutions/Refresh Rates Bitmap ...........................................................................70
5.1.5.2 VESA Resolutions/Refresh Rates Bitmap .........................................................................71
5.1.5.3 HH Resolutions/Refresh Rates Bitmap ..............................................................................72
5.1.5.4 Native Resolutions/Refresh Rates Bitmap .........................................................................73
5.1.5.5 Profiles Bitmap ..................................................................................................................73
5.1.5.6 Levels Bitmap ....................................................................................................................74
5.1.5.7 Slice Encoding Parameters Bitmap ....................................................................................74
5.1.5.8 Video Frame Rate Control Support Bitmap .......................................................................75
Wi-Fi Display Technical Specification - Version 1.1
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5.1.6 WFD 3D Video Formats Subelement ....................................................................................75
5.1.6.1 3D Video Capability Bitmap .............................................................................................76
5.1.7 WFD Audio Formats Subelement..........................................................................................78
5.1.7.1 LPCM Modes Bitmap ........................................................................................................79
5.1.7.2 AAC Modes Bitmap ..........................................................................................................79
5.1.7.3 AC3 Modes Bitmap ...........................................................................................................80
5.1.8 Content Protection Subelement .............................................................................................80
5.1.8.1 Content Protection Bitmap ................................................................................................80
5.1.9 WFD Extended Capability Subelement .................................................................................81
5.1.9.1 WFD Extended Capabilities Bitmap ..................................................................................81
5.1.10 Local IP Address Subelement ................................................................................................82
5.1.11 WFD Session Information Subelement .................................................................................82
5.1.12 Alternative MAC Address Subelement .................................................................................83
5.2 Management Frames ......................................................................................................................84
5.2.1 Beacon Frame Format............................................................................................................84
5.2.2 Probe Request Frame Format ................................................................................................84
5.2.2.1 Tunneled Probe Request/Response ....................................................................................84
5.2.3 Probe Response Frame ..........................................................................................................85
5.2.4 Association/Reassociation Request Frame ............................................................................86
5.2.5 Association/Reassociation Response Frame ..........................................................................86
5.2.6 P2P Public Action Frames .....................................................................................................87
5.2.6.1 GO Negotiation Request Frame .........................................................................................87
5.2.6.2 GO Negotiation Response Frame ......................................................................................87
5.2.6.3 GO Negotiation Confirmation Frame ................................................................................88
5.2.6.4 P2P Invitation Request Frame ...........................................................................................88
5.2.6.5 P2P Invitation Response Frame .........................................................................................89
5.2.6.6 Provision Discovery Request Frame ..................................................................................89
5.2.6.7 Provision Discovery Response Frame ...............................................................................90
5.2.7 Service Discovery Action Frames .........................................................................................90
5.2.7.1 WFD Service Discovery ....................................................................................................90
6 RTSP Based WFD Control Plane ..........................................................................................................93
6.1 RTSP Data Structures ....................................................................................................................93
6.1.1 ABNF Definitions ..................................................................................................................93
6.1.2 wfd-audio-codecs ...................................................................................................................93
6.1.3 wfd-video-formats .................................................................................................................94
6.1.4 wfd-3d-formats ......................................................................................................................95
6.1.5 wfd-content-protection ..........................................................................................................96
6.1.6 wfd-display-edid ....................................................................................................................96
6.1.7 wfd-coupled-sink ...................................................................................................................98
6.1.8 wfd-trigger-method ................................................................................................................98
6.1.9 wfd-presentation-url ..............................................................................................................98
6.1.10 wfd-client-rtp-ports ................................................................................................................99
6.1.11 wfd-route .............................................................................................................................100
6.1.12 wfd-I2C ................................................................................................................................100
