Miracast is the standard for wireless connections of devices (such as laptops, tablets, or smartphones) to be displayed (such as TVs, monitors or projectors), introduced in 2012. Roughly described as "HDMI over Wi- Fi ", change the cable from device to screen.
The Wi-Fi Alliance launches the Miracast certification program by the end of 2012. Miracast certified devices can communicate with each other, regardless of manufacturer. An adapter becomes available that is plugged into an HDMI or USB port, enabling devices without internal Miracast support to connect via Miracast. In 2017, ComputerWorld observed that "Miracast was never considered a standard", with the Android operating system having lost support in 2015.
Miracast uses the standard Wi-Fi peer-to-peer. This allows delivery of up to 1080p HD video (H.264 codec) and 5.1 surround sound (AAC and AC3 are optional codecs, mandate codec is linear pulse-code modulation - 16 bit 48 kHz 2 channels). Connections are made through WPS and are therefore secured by WPA2. IPv4 is used on the Internet layer. At the transport layer, TCP or UDP is used. In the application layer, streams are started and controlled via RTSP, RTP for data transfer.
Video Miracast
Device
The Wi-Fi Alliance maintains a list of certified devices, totaling over 6,700 on March 9, 2017.
Nvidia announced support in 2012 for their Tegra 3 platform, and Freescale Semiconductor, Texas Instruments, Qualcomm, Marvell Technology Group and other chip vendors have also announced their plans to support it. ActionTec Electronics also supports Miracast with Screenbeam product line.
Both devices (sender and receiver) must be Miracast certified for technology to function. However, to stream music and movies to non-certified devices, the Miracast adapter is available to plug into an HDMI or USB port.
On October 29, 2012, Google announced that the Android version 4.2 (from the latest version of Jelly Bean) supports Miracast wireless display standard, and by default has been integrated. With Android 6.0 Marshmallow, released in 2015, Miracast support was dropped again.
On January 8, 2013, LG Nexus 4 and Sony Xperia Z, ZL, T and V officially support the functionality, as did HTC One, Motorola on Droid Maxx & amp; Ultra flagships, and Samsung on Galaxy S III and Galaxy Note II under the AllShare Cast moniker . Galaxy S4 uses Samsung Link for its application. In October 2013, BlackBerry released update 10.2.1 for most BlackBerry 10 devices available at the time. In March 2015, BlackBerry Q10, Q5, Z30 and newer models support Miracast streaming; BlackBerry Z10 does not support Miracast, due to hardware limitations.
In April 2013, Rockchip launched the Miracast adapter powered by RK2928.
Microsoft also added support for Miracast in Windows 8.1 (announced in June 2013) and Windows 10. This functionality is first available in Windows 8.1 Preview, and is available on hardware with Miracast drivers supported from the manufacturer's hardware (GPU) as listed in top.
WDTV Live Streaming Media Player adds Miracast support with firmware version 2.02.32
Amazon Fire TV Stick, which began shipping on November 19, 2014, also supports Miracast.
Streaming sticks Roku and Roku TV began providing support for Miracast starting October 2014.
On July 28, 2013, Google announced the availability of Chromecast supported by Marvell DE3005-A1, but despite Google's initial name and initial support from Miracast on Android, Chromecast does not support Miracast.
At the end of April 2016, Ubuntu Touch-powered Meizu Pro 5 supports Miracast on OTA-11.
Maps Miracast
Function
This technology is promoted to work across all devices, regardless of brand. The Miracast tool negotiates the settings for each connection, which simplifies the process for the user. In particular, it avoids having to worry about the format or details of the codec. Miracast is "effectively a wireless HDMI cable, copying everything from one screen to another using the H.264 codec and the digital rights management layer (DRM) itself mimics the HDMI system". The Wi-Fi alliance suggests that Miracast can also be used by set-top boxes that want to stream content to a TV or tablet.
Media type streamed
Miracast can stream video in 1080p, DRM-like media DVDs, as well as stream protected premium content, allowing the device to stream feature movies and other copyrighted material. This is done using a Wi-Fi version of the same trusted content mechanism used on the cable-based HDMI and DisplayPort connections.
Screen resolution
- 27 Consumer Electronics Association (CEA) formats, ranging from 640 x 480 to 4096 x 2160 pixels, and from 24 to 60 frames per second (fps)
- 34 Video Electronics Standards Association (VESA) format, from 800 x 600 to 2560 x 1600 pixels, and from 30 to 60 fps
- 12 handheld formats, ranging from 640 x 360 to 960 x 540 pixels, and from 30 to 60 fps
- Required: 1280 x 720p30 (HD)
- Optional: 3840 x 2160p60 (4K Ultra HD)
Video
Required: ITU-T H.264 (Advanced Video Coding [AVC]) for HD and Ultra HD video; supports multiple profiles in transcoding and non-transcoding modes, including the Constrained Baseline Profile (CBP), at levels ranging from 3.1 to 5.2
Optional: ITU-T H.265 (High Efficiency Video Encoding [HEVC]) for HD and Ultra HD video; supports multiple profiles in transcoding and non-transcoding modes, including Main Profile, Main 444, SCC-8 bit 444, Main 444 10, at levels ranging from 3.1 to 5.1
Audio
Mandat audio codec: Linear Pulse-Code Modulation (LPCM) 16 bit, 48 kHz sampling, 2 saluran
Codec audio opsional, termasuk:
- mode LPCM 16 bit, sampling 44,1 kHz, 2 saluran mode
- Advanced Audio Coding (AAC)
- Mode Dolby Lanjutan Codec 3 (AC3)
- E-AC-3
- Dolby TrueHD, mode Dolby MAT
- Mode DTS-HD
- MPEG-4 AAC dan mode Audio 3D MPEG-H
- AAC-ELDv2
Riwayat versi
Masalah
Certification does not mandate the maximum latency (i.e. time between the image display on the source and the mirror image display in the sync view).
OS support
Windows
The latest Windows 10 release supports Miracast receive along with UIBC support to enable the human interface device (touch screen, mouse, keyboard) also has wireless connectivity. Windows 8.1 supports broadcasting/sending screens via Miracast. Miracast is also built on Windows Phone 8.1. Developers can also implement Miracast over the built-in Wi-Fi Direct support in Windows 7 and Windows 8. Another way to support Miracast on Windows is with Intel's WiDi (v3.5 or higher). A software-based Miracast receiver for Windows 8.1, Universal AirServer, was made available on October 31, 2014 by App Dynamic.
iOS and macOS
Apple does not support Miracast on iOS or macOS standards, instead using its older peer-to-peer AirPlay protocol.
Linux desktop
MiracleCast provides initial support for Miracast, but is not tied to that single protocol.
Android
Miracast support built into Android with version 4.2 and starting with Android 4.4, devices can be certified to the Wi-Fi Alliance Display Specification as compatible Miracast. Support dropped again with Android 6.0 Marshmallow in 2015, which supports Google's Google Cast protocol itself.
BlackBerry OS
Miracast is also supported by BlackBerry OS from version 10.2.1 and so on.
See also
- Digital Living Network Alliance (DLNA)
References
External links
- "Wi-Fi Certified Miracast: Extends Wi-Fi experience to smooth video view - Industry" (pdf) . Wi-Fi Alliance . 2012.
- "Wireless HDMI Wireless Transmission Protocol and Product Specific". Hi-Fi Portable . 2014.
Source of the article : Wikipedia
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