Wi-Fi CERTIFIED Miracast Part I – Introduction
What is Wi-Fi CERTIFIED Miracast?
Miracast is an interoperability test program for products that provide seamless wireless display of content, including graphical, video and audio content, across Wi-Fi devices—anywhere, at any time, without cables or even a connection to a Wi-Fi network. Equipment that passes the testing is designated “Wi-Fi CERTIFIED Miracast.”
Please refer to the following url.
http://www.youtube.com/watch?feature=player_detailpage&v=cYagdOp9y7E
http://www.youtube.com/watch?feature=player_detailpage&v=ts6kP-qFgAo
What is the difference between Miracast and Wi-Fi Display?
Miracast is the brand for the certification program operated by the Wi-Fi Alliance. Devices that pass this certification testing can be referred to as “Miracast devices”. Miracast certification is based on the Wi-Fi Alliance Wi-Fi Display Specification. This is the underlying technological specification developed by Wi-Fi Alliance members, and is copyrighted and owned by the Wi-Fi Alliance.
What types of equipment are tested?
Miracast is an optional certification program for video-capable devices, such as TVs, handsets, tablets, laptops, over-the-top set-top boxes, cameras and projectors.
Must both the content source and display be Miracast devices?
To enjoy Miracast, both the display and the source devices must be certified for Miracast. Miracast may be used on devices without embedded Wi-Fi through the use of a Miracast-certified adapter that supports an interface such as High-Definition Multimedia Interface (HDMI) or Universal Serial Bus (USB).
Do Miracast devices implement the latest Wi-Fi core technology? What about technologies on the near horizon?
Miracast uses many of the building blocks that, over the years, have enriched the user experience and increased their trust in Wi-Fi, including Wi-Fi CERTIFIED n (improved throughput and coverage), Wi-Fi Direct™ (device-to-device connectivity), Wi-Fi Protected Access® 2 (WPA2™) (security), Wi-Fi Multimedia™ (WMM®) (traffic management) and Wi-Fi Protected Setup™.
Miracast is expected to directly benefit from continuous advances in Wi-Fi performance, such as those offered by the upcoming 5 GHz program, based on 802.11ac.
How is Miracast related to Wi-Fi Direct?
Wi-Fi Direct allows devices to connect directly to each other, without the need for a Wi-Fi AP, and often requiring just the push of a button. Wi-Fi Direct allows source and display devices to discover one another and provides the underlying device-to-device connectivity for Miracast. Miracast builds upon Wi-Fi Direct with mechanisms to negotiate video capabilities, setup content protection (if needed), stream content, and maintain the video session.
What formats does Miracast support?
For video, Miracast supports the ITU-T H.264 video codec (AKA Advanced Video Coding [AVC]) for high-definition video. It supports the Constrained Baseline Profile (CBP) and the Miracast-specific Constrained High Profile (CHP), at levels ranging from 3.1 to 4.2. Supported display resolutions include common Consumer Electronics Association (CEA) formats, Video Electronics Standards Association (VESA) formats, and handheld formats.
For audio, Miracast supports a number of Linear Pulse-Code Modulation (LPCM), Advanced Audio Coding (AAC), and Dolby Advanced Codec 3 (AC3) modes.