Information technology — UPnP Device Architecture — Part 20-3: Audio video device control protocol — Level 4 — Media server device (ISO/IEC 29341-20-3:2017)
This device specification is compliant with the UPnP Device Architecture version 1.0 [14]. Itdefines a device type referred to herein as MediaServer.The MediaServer specification defines a general-purpose device that can be used toinstantiate any Consumer Electronics (CE) device that provides AV content (for example,media) to other UPnP devices on the home network. It is based on the UPnP AV ArchitectureFramework (described in another document). It exposes its content via the ContentDirectoryservice (refer to the ContentDirectory service specification for details). The MediaServer mayalso provide functionality to record content using the ScheduledRecording service (refer to theScheduledRecording service specification). As such, the MediaServer can handle any specifictype of media, any data format, and transfer protocol.Example instances of a MediaServer include traditional devices such as VCRs, CD Players,DVD Players, audio-tape players, still-image cameras, camcorders, radios, TV Tuners, andset-top boxes. Additional examples of a MediaServer also include new digital devices such asMP3 servers, PVRs, smartphones and Home MediaServers such as the PC. Although thesedevices contain diverse (AV) content in one form or another, the MediaServer (via theContentDirectory service) is able to expose this content to the home network in a uniform andconsistent manner. This ability allows the MediaServer to instantiate traditional single-functiondevices as well as more recent multi-function devices such as VCR-DVD players and thegeneral purpose Home MediaServer, which contains a wide variety of content such as MPEG2video, CD audio, MP3 and/ or WMA audio, JPEG images, etc.The MediaServer specification is very lightweight and can easily be implemented on low-resource devices such as still-image cameras or MP3 players that want to expose their localcontent to the home network. The MediaServer can also be used for high-end HomeMediaServers that contain dozens of Gigabytes of heterogeneous content. Refer to theTheory Of Operation subclause for some specific examples of the MediaServer.A full-featured MediaServer device provides clients with the following capabilities: Enumerate and query any of the content that the MediaServer can provide to the homenetwork. Negotiate a common transfer protocol and data format between the MediaServer andtarget device. Control the flow of the content (for example, FF, REW, etc). Copy (import) content to the MediaServer from another device. Record content using the ScheduledRecording service [25].This device specification does not provide: The ability to render AV content.Figure 1 — MediaServer Functional DiagramThe un-shaded blocks represent the UPnP services that are contained by a MediaServerdevice. The shaded blocks represent various device-specific modules that the UPnP servicesISO/ IEC 29341-20-3:2017(E)2 ISO/ IEC 2017 – All rights reservedmight interact with. However, the internal architecture of a MediaServer device is vendorspecific.
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