信息技术 - UPnP设备架构 - 第20-3部分:音频视频设备控制协议 - 第4级 - 媒体服务器设备

[中文适用范围]： 该设备规范与UPnP设备架构版本1.0兼容。它定义了一种称为MediaServer的设备类型。MediaServer规范定义了一个通用设备，可用于在家庭网络上提供音视频内容。它基于UPnP AV架构框架，并通过ContentDirectory服务暴露其内容。MediaServer还可以使用ScheduledRecording服务记录内容。它可以处理任何特定类型的媒体、数据格式和传输协议。例如包括传统设备如录像机、CD播放器、DVD播放器等，以及新数字设备如MP3服务器、PVR、智能手机和家庭媒体服务器等。尽管这些设备包含不同形式的音视频内容，但MediaServer（通过ContentDirectory服务）可以以统一和一致的方式将其暴露在网络中。这使得MediaServer能够实例化传统单功能设备以及多功能设备。规范非常轻量，适用于低资源设备如照相机或MP3播放器，并可用于高端家庭媒体服务器。 [外文原描述]： ISO/IEC 29341-20-3:2017 is compliant with the UPnP Device Architecture version 1.0 [14]. It defines a device type referred to herein as MediaServer. The MediaServer specification defines a general-purpose device that can be used to instantiate 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 Architecture Framework (described in another document). It exposes its content via the ContentDirectory service (refer to the ContentDirectory service specification for details). The MediaServer may also provide functionality to record content using the ScheduledRecording service (refer to the ScheduledRecording service specification). As such, the MediaServer can handle any specific type 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, and set-top boxes. Additional examples of a MediaServer also include new digital devices such as MP3 servers, PVRs, smartphones and Home MediaServers such as the PC. Although these devices contain diverse (AV) content in one form or another, the MediaServer (via the ContentDirectory service) is able to expose this content to the home network in a uniform and consistent manner. This ability allows the MediaServer to instantiate traditional single-function devices as well as more recent multi-function devices such as VCR-DVD players and the general purpose Home MediaServer, which contains a wide variety of content such as MPEG2 video, 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 local content to the home network. The MediaServer can also be used for high-end Home MediaServers that contain dozens of Gigabytes of heterogeneous content. Refer to the Theory Of Operation subclause for some specific examples of the MediaServer.