DLNA is an acronym for D igital L iving N etwork A lliance. It is a capability in a device allowing it to talk to other devices with another DLNA device.
It interconnects electronic devices within a zone.
What is DLNA?
DLNA is a standard based on UPnP model, whose primitive goal was to attach all devices directly to computer.
With a view to interconnect devices seamlessly, DLNA was brought to light. DLNA represents the content negotiation and sharing portion.
At a customary level, a DLNA device works like any other device by discovering other DLNA-enabled hosts. But its competence doesn’t stop there. The DLNA device goes on to learn other devices’ capabilities.
Three main pools of electronic goods that prevail in today's world are
Why DLNA? Contd…
Consumers wish to inter-operate in these 3 zones
Digital Living Network Alliance (DLNA) is a cross-industry organization of leading operators of these 3 islands - consumer electronics, computing industry and mobile devices.
They provide a seamless environment for sharing and growing new digital media and content services.
UPnP – Origin of DLNA
DLNA in its primitive form originated from UPnP – Universal Plug and Play
UPnP works on these basic schemes:
Technical view of a DLNA network
All of this requires three basic components - a player, a server and a stream of data that are all compatible with each other.
Networking and connectivity
With the network addresses getting depleted, IPv6 protocol emerged, an improved version of IPv4.
Advantages of using IP in digital home network:
IP allows applications running over different media to communicate transparently.
IP can connect every device in the home to the Internet. Since IP is the protocol of the Internet, any device in the digital home can be potentially connected to any other Internet-connected device in the world.
IP connectivity is inexpensive. Because it is ubiquitous, economies of scale and competition combine to make physical media implementations of IP available at lower cost than other technologies.
DLNA System Architecture – Pull-type UI
DLNA System Architecture – Push-type UI
Discovery includes device and service discovery.
This takes into account -
Discovering the presence and capabilities of other devices in the connected network.
Control and interconnect with the discovered devices.
The Service protocol used in DLNA is SSDP - Simple Service Discovery protocol.
Common media formats and streaming protocols Protocols define the mode of transfer. DLNA uses HTTP as its protocol for streaming. Table 1. DLNA Media formats for Home Devices Media Formats Required Formats Set Optional Formats Set Imaging JPEG GIF, TIFF, PNG Audio LPCM (2 channel) MP3, WMA9, AC-3, AAC, ATRAC3plus Video MPEG2 MPEG1, MPEG4, WMV9 Table 2. DLNA Media formats for Mobile/Handheld Devices Media Formats Required Formats Set Optional Formats Set Imaging JPEG GIF, TIFF, PNG Audio MP3 and MPEG4 AAC LC MPEG4 (HE AAC, AAC LTP, BSAC), AMR, ATRAC3plus, G.726, WMA, LPCM Video MPEG4 AVC (AAC LC Assoc Audio) VC1, H.263, MPEG4 part 2, MPEG2, MPEG4 AVC (BSAC or other for Assoc. Audio)
Inter-operability among vendor products
There must be a common standard among the products for the operation and DLNA publishes guidelines for inter-operability.
Quality of Service (QOS)
Quality of service is the ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow.
Authentication & Authorisation
Authentication is the mechanism whereby systems may securely identify their users. Authentication systems provide an answer to the questions:
Who is the user?
Is the user really who he/she represents himself to be?
A uthorization , by contrast, is the mechanism by which a system determines what level of access a particular authenticated user should have to secured resources controlled by the system.
Digital Rights Management (DRM)
Content must be protected from unauthorized copying and use.
Today, there are several DRM technologies available to device designers and content providers.
With growing demand for consumer goods, there is an equal rise in crave for interconnecting devices, be at home or office. DLNA is THE way to achieve is.
The best aspect of DLNA is that it allows products from different manufacturers to talk to each other.
With DLNA all leading CE companies are tied in a technological knot; there is interdependence, yet independence with their own products.
In the near future, digital homes will contain intelligent platforms which will manage and distribute rich digital content to rendering devices such as televisions and wireless monitors from devices such as digital cameras, camcorders and multimedia mobile phones.