SMPTE ST 2071

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SMPTE ST 2071 is a suite of standards published by the Society of Motion Picture and Television Engineers (SMPTE) that define a framework, protocol, and method of service discovery for the control of objects within an Internet of Things. The standards focus on the interoperability and discoverability of objects within the network, and treat media as first-class citizen. The standard also describes a programming methodology that allows objects to describe their behaviors (features) to other objects over the network and allows objects to change their behavior dynamically at runtime. Application developers developing to the SMPTE ST 2071 standards focus on writing their applications to the behaviors they wish to support and not the object or class of object that implements those behaviors. [1]

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Service discovery is the automatic detection of devices and services offered by these devices on a computer network. A service discovery protocol (SDP) is a network protocol that helps accomplish service discovery. Service discovery aims to reduce the configuration efforts from users.

Media as a first-class citizen

The SMPTE ST 2071 standards define media as a first-class citizen, changing the focus from controlling devices and services to controlling media. This paradigm shift provides a more natural method of discovering, managing, and manipulating media as it harmonizes the way media is controlled with the way that it is conceptually perceived.

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Discoverability is the degree to which of something, especially a piece of content or information, can be found in a search of a file, database, or other information system. Discoverability is a concern in library and information science, many aspects of digital media, software and web development, and in marketing, since something cannot be used if people cannot find it or do not understand what it can be used for. Metadata, or "information about information," such as a book's title, a product's description, or a website's keywords, affects how discoverable something is on a database or online. In the 2010s, adding metadata to a product that is available online can make it easier for end users to find the product. For example, if a song file is made available online, making the title, name of the band, genre, year of release, and other pertinent information available in connection with this song file will make it easier for users to find this song file. Organizing information by putting it into alphabetical order or including it in a search engine is an example of how to improve discoverability. Discoverability is related to, but different from, accessibility and usability, other qualities that affect the usefulness of a piece of information.

Features as first-class citizens

The SMPTE ST 2071 standards define a development methodology that elevates features to a first-class citizen status, allowing for those features to be decoupled from the objects that implement them. The standard defines capabilities as uniquely identified features that may be defined through normative prose and/or interface definition languages, such as OMG IDL or WSDL, and consequently documented or registered within a repository to foster feature-level interoperability within heterogeneous environments.

In computer science, an object can be a variable, a data structure, a function, or a method, and as such, is a value in memory referenced by an identifier.

An interface description language or interface definition language (IDL), is a specification language used to describe a software component's application programming interface (API). IDLs describe an interface in a language-independent way, enabling communication between software components that do not share one language. For example, between those written in C++ and those written in Java.

Interoperability and new applications

The interoperable exchange of media requires common file formats, compression/encoding techniques, transport mechanisms, semantics, and a common means by which media can be discovered, located, accessed, and managed. The SMPTE ST 2071 suite of standards defines an open protocol for the control of objects within an Internet of Things with provisions for the representation and control of media as a first-class citizen. The SMPTE ST 2071 Media & Device Control standard also defines a new programming methodology by which complex behaviors can be modeled as sets of uniquely identified features, known as capabilities, and a framework by which the endpoints exposing these capabilities can be made discoverable. As with media, SMPTE ST 2071 elevates capabilities (features) to a first-class citizen status, allowing for those capabilities to be decoupled from the objects that expose them. This new methodology can be used to simplify existing applications by facilitating the discovery of media services within a local area network and/or the Cloud. New applications may also be written to control mediacentric objects (devices and services) without forehand knowledge of the implementation of those objects. Commands may also be embedded within media streams to facilitate the initiation of action within the receiving system if the capabilities are exposed by the receiving system or can be ignored if they are not. This may prove useful for the control of objects on the receiving end, such as the control of tactile devices or some yet to be identified application.

Standards documents

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References

  1. 1 2 "SMPTE ST 2071-1:2014 – Media Device Control Framework". doi:10.5594/S9781614828112. ISBN   978-1-61482-811-2.
  2. ↑ "SMPTE ST 2071-2:2014 – Media Device Control Protocol". doi:10.5594/S9781614828129. ISBN   978-1-61482-812-9.
  3. ↑ "SMPTE ST 2071-3:2014 – Media Device Control Discovery". doi:10.5594/S9781614828136. ISBN   978-1-61482-813-6.


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