WO2008113246A1 - Procédé pour obtenir un fichier de protocole de description de session d'un dispositif portable de diffusion vidéo numérique - Google Patents

Procédé pour obtenir un fichier de protocole de description de session d'un dispositif portable de diffusion vidéo numérique Download PDF

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Publication number
WO2008113246A1
WO2008113246A1 PCT/CN2008/000260 CN2008000260W WO2008113246A1 WO 2008113246 A1 WO2008113246 A1 WO 2008113246A1 CN 2008000260 W CN2008000260 W CN 2008000260W WO 2008113246 A1 WO2008113246 A1 WO 2008113246A1
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WO
WIPO (PCT)
Prior art keywords
type
session description
description protocol
node
service
Prior art date
Application number
PCT/CN2008/000260
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English (en)
French (fr)
Inventor
Gang Cao
Benquan Zhang
Original Assignee
Zte Corporation
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Filing date
Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to EP08706445A priority Critical patent/EP2141909A4/en
Publication of WO2008113246A1 publication Critical patent/WO2008113246A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643—Communication protocols
    • H04N21/64315—DVB-H
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643—Communication protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast

Definitions

  • the present invention relates to a method for acquiring an SDP (Session Description Protocol, SDP) in the field of DVB-H (Digital Video Broadcasting Handheld) mobile phone television, and more particularly to By acquiring the SDP, the mobile TV can quickly and accurately obtain the SDP file corresponding to the service identifier selected by the user in the complex ESG (Electronic Service Guide, ESG) information.
  • SDP Session Description Protocol
  • DVB-H Digital Video Broadcasting Handheld
  • DVB-H supports the largest number of companies and the widest coverage. It is the transmission standard established by the European Digital Television Broadcasting Standardization Group to provide multimedia services to portable/handheld terminals via terrestrial digital broadcasting networks, and has a wide commercial frontier.
  • the ESG menu contains all the information about the services available on the current mobile TV, including information such as TV channel information, TV program information, TV broadcasts and audio and video file downloads. With this information, users can choose the services they are interested in for consumption. . Among them, TV broadcast (including free, scrambled and premium channel playback) and audio and video file download parameters (such as the corresponding IP address and port number of the channel media data packet in the broadcast channel, the codec format of the media package, etc.) They are all included in their respective SDP files.
  • TV broadcast including free, scrambled and premium channel playback
  • audio and video file download parameters such as the corresponding IP address and port number of the channel media data packet in the broadcast channel, the codec format of the media package, etc.
  • SDP files There are two ways to exist for SDP files. One is the out-of-band method, that is, the SDP file is independent of the ESG container file. The get segment in the ESG container file only provides information for receiving the file. The other way is the in-band mode, that is, the SDP file is embedded in the ESG acquisition segment, and the ESG engine is required to The SDP file is parsed in the segment.
  • some channels may associate two or more acquisition segments, and some acquisition segments may contain two or more SDP files, so that the service channel is Corresponding to multiple SDP files, the usual solution in the prior art is to sequentially input the SDP file corresponding to the service channel until a correct SDP file is obtained. In this way, when there are more SDP files corresponding to the channel, the operation efficiency of the mobile TV will be greatly reduced, and the risk of terminal collapse will increase.
  • the technical problem to be solved by the present invention is to provide a method for acquiring a session description protocol file of a digital television broadcasting handheld device, which can quickly find a session description protocol file required by a user.
  • the technical solution of the present invention is to provide a method for acquiring a session description protocol file of a digital television broadcast handheld device, including:
  • the digital television broadcast handheld device saves the electronic service guide information, and saves the session description protocol file and its related auxiliary attribute information in the local file system;
  • the user selects a service channel and specifies a service type, and the digital television broadcast handheld device queries the corresponding session description protocol file information and its associated auxiliary attribute information according to the service identifier of the service channel;
  • the digital television broadcast handheld device selects a session description protocol file whose auxiliary attribute information matches the service type from all the session description protocol file information and related auxiliary attribute information that is queried as the session required by the user. Describe the protocol file. Further, in the step a, when the electronic service guide engine in the digital television broadcast handheld device receives a service segment, saves all the acquired segment identification numbers in the service segment, and when the electronic service guide engine receives an acquisition In the segment, the session description protocol file embedded in the acquisition segment is intercepted and saved in the data structure of the acquisition segment in the local file system, and the auxiliary attribute related to the session description protocol is recorded in the data structure. information.
  • the electronic service guide engine searches for the corresponding acquisition segment according to the service identifier and traverses the data structure of the acquisition segments, and uses the session description protocol file information and related assistance in each acquisition segment.
  • the attribute information generates a session description protocol information linked list, each acquisition segment as a node in the linked list, and then returns the session description protocol information linked list to the electronic service guide browser in the digital television broadcast handheld device.
  • the session description protocol file information includes an absolute path of the session description protocol file and a file name thereof;
  • the related auxiliary attribute information includes member characteristic type information of the session description protocol.
  • the service type includes television, broadcast, download, and other types
  • the member feature types include video, audio, download, and other types
  • the content media types include television, broadcast, download, and other types.
  • the related auxiliary attribute information further includes a content media type corresponding to the session description protocol file
  • the service type specified by the user is a TV type
  • the session description protocol information list does not have a session description protocol node whose member attribute type matches the service type
  • the electronic service guide browser returns the largest content in the TV type.
  • a session description protocol node of the media type priority level, and the session description protocol file corresponding to the node is used as a session description protocol file required by the user;
  • the electronic service guide browser returns the largest content in the broadcast type.
  • the session type protocol node of the media type priority level is used as the session description protocol file required by the user.
  • the service type specified by the user is a TV type
  • the electronic service guide browser returns the A session description protocol node whose member attribute type matches the service type, and the session description protocol file corresponding to the node is used as a session description file required by the user.
  • the service type specified by the user is a broadcast type
  • the electronic service guide browser returns the member feature type.
  • a session description protocol node matching the service type, and the session description protocol file corresponding to the node is used as a session description protocol file required by the user.
  • the session description protocol node that returns the maximum content media type priority level by the electronic service guide browser means that the electronic service guide browser sets a content media type of an initial session description protocol node with a minimum priority of the content media type Priority level, and then traversing each node of the session description protocol information list, if the member attribute type of the current node is empty, setting the content media type priority level of the current node according to the content media type, and saving or updating the current maximum a content media type priority level and a corresponding session description protocol node. If the member feature type of the current node is not empty and does not match the service type, the next node in the session description protocol information list is obtained. After all nodes have been completed, the session description protocol node of the maximum content media type priority level is returned.
  • the electronic service guide browser traverses each node of the session description protocol information list, and if the member attribute type of the current node is a download type, Returning to the current session description protocol node, otherwise obtaining the next node in the session description protocol information list, and returning the first node in the linked list if there is no session description protocol node whose member attribute type is a download type in the linked list
  • the session description protocol node uses the session description protocol file corresponding to the node as the session description protocol file required by the user.
  • the electronic service guide browser returns the first session description protocol node of the session description protocol information list, and the session description corresponding to the node
  • the protocol file serves as the session description protocol file required by the user.
  • the matching of the member feature type and the service type means: when the service type is a TV, the member feature type matches the service type if the video type is included; when the service type is broadcast, The member attribute type matches the service type if it is an audio type.
  • setting the content media type priority level of the node according to the content media type of the current node is setting a priority level according to the commonness of the content media type, and the more common the corresponding priority level is.
  • the present invention provides a method for acquiring a session description protocol file of a digital television broadcast handheld device, which enables the mobile phone television to quickly and accurately obtain the SDP file required by the user to select a service channel in the complex ESG information.
  • the overall performance of DVB-H mobile TV is improved.
  • 1 is a general flow chart of an SDP receiving phase, an SDP query phase, and an SDP decision phase of the method of the present invention
  • FIG. 2 is a flowchart of related processing of an SDP receiving phase in a method for acquiring a DVB-H mobile TV SDP according to the present invention
  • FIG. 3 is a flowchart of related processing in an SDP query phase in the DVB-H mobile TV SDP acquisition method according to the present invention
  • FIG. 4 is a flow chart showing the related processing of the SDP decision phase in the DVB-H mobile TV SDP acquisition method proposed by the present invention.
  • the invention provides a method for acquiring a session description protocol file of a digital television broadcasting handheld device, and the digital television broadcasting handheld device comprises an ESG engine and an ESG browser and the like.
  • the ESG engine selects the correct SDP file for the channel by obtaining auxiliary attribute information (such as audio, video, download, etc.) in the segment.
  • the embodiment is basically divided into three stages of processing, that is, the SDP receiving stage. Processing, processing in the SDP query phase, and processing in the SDP decision phase.
  • the receiving process of the SDP is performed in the process of receiving ESG information by the ESG engine.
  • the ESG information the SDP-related information is included in the service segment and the acquisition segment. Therefore, when the ESG engine receives a service segment, all the segment ID numbers of the segment need to be saved.
  • the ESG engine receives an acquisition segment, it needs to intercept the embedded SDP file in the segment and save it in the local file system, and record the auxiliary attribute information related to SDP.
  • the processing steps of the method in this embodiment are performed in the receiving phase of the DVB-H mobile TV SDP, and specifically include:
  • Step 101 When the ESG engine receives an ESG data segment, and determines whether the data segment is an ESG service segment according to the segment type identifier, if yes, go to step 102. Otherwise, go to step 103.
  • Step 102 Record all the acquisitions in the ESG service segment. The ID number of the segment is saved in the form of a linked list, and step 105 is performed;
  • Step 103 Determine whether the ESG data segment is an ESG acquisition segment, if yes, go to step 104, otherwise go to step 105;
  • Step 104 The SDP file embedded in the acquisition segment is intercepted and saved in the local file system, and the auxiliary attribute information related to the SDP in the ESG acquisition segment is recorded and saved in the data structure of the acquisition segment.
  • Step 105 Determine whether all ESG data segments have been processed, and then end, otherwise return to step 101.
  • the ESG acquisition segment data structure can be defined as follows:
  • the service segment may have multiple acquisition segments, and one acquisition segment is one member;
  • the content type of content (including the content type from which the terminal can determine the consuming application of the service) is included in the ear segment, and refers to the content type of the service that needs to be consumed obtained from the terminal, that is, the type of consumption selected by the user. , such as TV, radio, file downloads, etc. (4) Point to the next ESG to get the segment structure.
  • the data structure for obtaining the segment member description type in the above data structure can be defined as follows: (1) member attribute type structure;
  • the above three items constitute the corresponding information of one SDP file, and the above information of one or more SDP files may be included in one acquisition segment.
  • the data structure of the member attribute type in the above structure is defined as follows:
  • the member enumeration type includes:
  • An acquisition segment corresponds to only one content media type, an acquisition segment contains one or more member description types, and a member description type contains one or more member property types.
  • acquisitionID "cbms: ⁇ telecomitalia.it/acquisition/xxx" ⁇
  • each acquisition segment is associated in a linked list form, but the present invention is not limited to a specific data structure and storage manner, as long as the required information is available.
  • the query process of the SDP in this embodiment is that when the user selects a certain type of service in a certain service channel for consumption on the mobile phone television, the ESG browser sends the service ID number corresponding to the channel to the ESG engine to perform the service.
  • the required SDP file query After receiving the service ID number, the ESG engine searches and traverses each corresponding segment data structure, and constructs the SDP related information saved in the first step SDP receiving phase into an SDP information linked list and returns it to the ESG browser;
  • the relevant processing steps of the query phase specifically include:
  • Step 201 When the user selects a certain type of service in a certain service channel to consume on the mobile TV, the ESG browser sends the service ID number corresponding to the channel to the ESG engine for SDP query;
  • Step 202 After receiving the service ID number, the ESG engine finds all the acquisition segment ID numbers corresponding to the service ID number, and includes the ID of one or more acquisition segments corresponding to the service segment in the service segment.
  • Step 203 ESG engine Traverse each acquisition segment ID number, which will be saved in the receiving phase The information about the segment is constructed into an information link table of SDP query results. Each node in the information link table corresponds to an SDP file and its associated auxiliary attribute information.
  • the data structure of each node is defined as follows:
  • the ESG browser after the ESG browser receives the SDP information linked list returned by the ESG engine, it needs the SDP file in which node in the decision list to be required for the service selected by the user on the mobile TV.
  • the generation rule of the SDP file only one SDP node file in the SDP information list corresponding to a service ID matches the service type of the service selected by the user. If the service type selected by the user is TV, if there is a video in the member feature type, the two are matched. For example, when the service type selected by the user is broadcast, when the member feature type has audio, the two are matched, for example, the user selects When the service type is download, the member attribute type is considered to match when downloading.
  • the auxiliary attribute data in the ESG acquisition segment is sometimes incomplete.
  • the server side only provides some auxiliary attributes in order to improve the efficiency of ESG transmission.
  • the auxiliary attribute is only included in the ESG acquisition segment, and has no relationship with the data structure of the SDP file itself.
  • the ESG engine may incorrectly select the SDP file, resulting in a service that cannot be selected by the user.
  • the present invention also proposes a content media type priority level for setting the SDP file for the problem, and returns the most as shown in FIG. 4 when the auxiliary attribute information is incomplete.
  • the processing of the decision phase is as follows:
  • Step 301 Determine the service type selected by the user, and set the priority of the content media type of the initial SDP node to a minimum, such as, but not limited to, being set to 0;
  • the service type is included in the service segment, generally refers to the type of service segment, such as TV, broadcast, download, and other types (such as online voting).
  • One service channel can correspond to one or more service types.
  • Step 302 Obtain a first node in an information link table of an SDP query result.
  • Step 303 Determine whether the service type selected by the user belongs to the television. If the step 304 is performed, otherwise step 307 is performed;
  • Step 306 Determine whether the member feature type of the SDP node is empty, that is, whether the ESG data itself carries the member property type information, if it is empty, go to step 305, otherwise go to step 306;
  • Step 305 Determine the priority of the content media type of the current SDP node according to the content media type of the node, and save or update the current maximum content media type priority level corresponding to the service type and its corresponding SDP node number, and perform step 311;
  • the user since the user generally only specifies the approximate type when specifying the service type, such as specifying the TV, broadcast or download type, and the TV or broadcast type has many subtypes, it is necessary to set the content type of the node according to the content media type of the SDP node. level.
  • the media type priority of the node is set according to the commonality of the content media type (contentMimeType) of the node, such as the most commonly used content media type such as "video/mpeg4-generic" (video/mpeg4 encoding) in the local network ESG.
  • the priority level is set to the highest, which can be, but is not limited to, the priority of the media type of the node of the class is set to 1, and the priority of the content media type such as "application/mpeg-laser" is more commonly used.
  • the media type of the node may be set to a priority of 0.5, and the least frequently used content media type such as "application/octet-stream" has the lowest priority, but It is not limited to setting the priority of the media type of the class node to 0.1.
  • Step 306 traversing all member enumeration types of the member attribute type of the node, determining whether the member attribute type belongs to the video, if yes, performing step 309; otherwise, performing step 311;
  • Step 307 Determine whether the service type selected by the user belongs to the download type, if step 308 is performed, otherwise step 310 is performed;
  • Step 308 traversing all the member enumeration types of the member attribute types of the node, determining whether the member attribute type belongs to the download type, if yes, executing step 309, otherwise performing step 311;
  • Step 309 returning the SDP node, The corresponding SDP file is used as the SDP required by the user service, and ends;
  • the download type is a special type, single type, unlike TV or broadcast types. There are many subtypes. Therefore, if the service type and the member attribute type are both download types, the service type and the member attribute type are fully compatible, and the SDP node is definitely the SDP required by the service.
  • Step 310 If the service type belongs to another type, directly return to the SDP node, and use the corresponding SDP file on the node as the SDP required by other types of services, and end;
  • Other types of services here refer to types other than television, broadcast, and download (such as online voting, etc.). These types of service segments only correspond to one acquisition segment, and the acquisition segment is very simple, that is, an SDP file, that is, only one type of the type. Node, so it's over here.
  • Step 311 The next node in the information link table of the SDP query result is obtained. If the next node is not empty, step 304 is performed, otherwise step 312 is performed;
  • Step 312 Return the SDP node corresponding to the priority of the maximum content media type, and use the corresponding SDP file on the node as the SDP required by the user to select the service, and end.
  • the service type is a special type of download type. If a service segment corresponds to multiple SDPs, there must be a corresponding member attribute type of the download type SDP; if the member attribute type is not specifically specified as the download type, Then the situation is that the service segment only corresponds to one acquisition segment, and the acquisition segment only corresponds to one SDP, and the SDP node is a node required by the user.
  • the judgment logic and operation flow are similar to the service type when the service type is broadcast. Only when the service type is broadcast, if the member feature type of the node has an audio type, it is considered to match the service type.
  • the method of the present invention does not completely guarantee that the correct SDP can be found all at once, but an optimized method is to use the existing information in the current network to find the correct SDP as much as possible.
  • the method of the invention can quickly and accurately obtain the SDP file required by the user in the complex ESG information, and also in the case that the ESG acquires the segment auxiliary attribute (such as the member characteristic) is also incomplete.
  • the correctness of the SDP file selection can be realized, so as to implement related services normally.
  • the method of the invention overcomes the drawbacks of the conventional method of sequentially inputting the SDP file corresponding to the service channel until the acquisition of a correct SDP file, thereby greatly improving the overall performance of the DVB-H mobile TV.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Description

数字电视广播手持设备的会话描述协议文件的获取方法
技术领域
本发明涉及一种在 DVB-H ( Digital Video Broadcasting Handheld, 数字 电视广播手持设备 )手机电视领域中的 SDP ( Session Description Protocol , 会话描述协议， 以下简称 SDP ) 的获取方法， 尤其涉及的是一种通过获取 SDP能使手机电视在复杂的 ESG ( Electronic Service Guide, 电子服务指南， 以下简称 ESG )信息中快速、 准确地获取用户所选择的业务标识即业务 ID 对应的 SDP文件的方法。 背景技术
随着 3G时代的到来， 手机电视相关技术越来越成为电子通讯领域研究 的热点。 在目前手机电视的主流标准中， 其中 DVB-H支持的公司最多， 覆 盖面最广。它是欧洲数字电视广播标准化团体组织为通过地面数字广播网络 向便携 /手持终端提供多媒体业务所制定的传输标准， 且有着广泛的商用前 景。
在实际应用中， 要使用 DVB-H手机电视来消费相关的业务（如收看电 视节目、 视频文件下载等） ， 首先需要通过终端上一个 ESG浏览器应用程 序来接收并加载数字电视广播中的 ESG信息。
ESG菜单包含了当前手机电视可用业务的所有信息，包括如电视频道信 息、 电视节目信息、 电视播放和音视频文件下载所需的相关参数等， 通过这 些信息， 用户可以选择自己感兴趣的业务进行消费。 其中电视播放（包括免 费、 加扰和收费频道的播放）和音视频文件下载所需的参数（如该频道媒体 数据包在广播信道中对应的 IP地址和端口号、 媒体包的编解码格式等）都 包含在各自对应的一个 SDP文件中。
SDP文件的存在有两种方式，一种是带外方式，即 SDP文件独立于 ESG 容器文件之外， ESG容器文件中的获取段只提供接收该文件的信息。 另外一 种方式是带内方式， 即 SDP文件内嵌在 ESG获取段中， 需要 ESG引擎从该 段中解析出 SDP文件。
当前大部分商用 DVB-H网络都使用后一种方式。 通常一个业务频道总 是关联一个获取段， 该段只包含一个 SDP文件， 在这种情况下当用户选择 一个业务频道进行消费时， ESG浏览器通过向 ESG引擎查询可以直接获取 该频道所需要的 SDP文件。
但在实际 DVB-H商用网广播的 ESG信息中，有些频道会关联两个或两 个以上的获取段， 而有些获取段又会包含两个或两个以上的 SDP文件， 这 样该业务频道就对应了多个 SDP文件， 现有技术通常的解决方法是依次尝 试输入该业务频道对应的 SDP文件，直到获取到一个正确的 SDP文件为止。 这种方法在频道对应的 SDP文件较多时，会大大减低手机电视的运行效率， 同时会增加终端崩溃的风险。
所以在 DVB-H手机电视系统中， 迫切需要有一种可靠的方法可以使手 机电视在复杂的 ESG信息中快速、 准确地获取用户所需的 SDP文件， 以实 现相关的业务， 从而提高 DVB-H手机电视的整体性能。 发明内容
本发明要解决的技术问题是提供一种数字电视广播手持设备的会话描 述协议文件的获取方法， 可快速地找到用户所需的会话描述协议文件。
本发明釆用的技术方案是提供一种数字电视广播手持设备的会话描述 协议文件的获取方法， 包括：
a、 数字电视广播手持设备接收电子服务指南信息的过程中， 将其中的 会话描述协议文件及其相关的辅助属性信息保存在本地文件系统；
b、 用户选择业务频道并指定业务类型， 所述数字电视广播手持设备才艮 据所述业务频道的业务标识查询到其对应的会话描述协议文件信息及其相 关的辅助属性信息；
c、 所述数字电视广播手持设备从查询到的所有会话描述协议文件信息 及其相关的辅助属性信息中，选择辅助属性信息与所述业务类型相匹配的会 话描述协议文件作为用户所需的会话描述协议文件。 进一步地， 所述步骤 a中， 所述数字电视广播手持设备中的电子服务指 南引擎收到一个业务段时，保存所述业务段中所有获取段标识号， 当电子服 务指南引擎收到一个获取段时，将所述获取段中内嵌的会话描述协议文件截 取出来保存在本地文件系统中该获取段的数据结构中，同时在该数据结构中 记录下与所述会话描述协议相关的辅助属性信息。
进一步地， 所述步骤 b中， 所述电子服务指南引擎根据所述业务标识查 找到对应的获取段并遍历这些获取段的数据结构，将各获取段中的会话描述 协议文件信息及其相关辅助属性信息生成一会话描述协议信息链表，每个获 取段作为链表中的一个节点，然后将所述会话描述协议信息链表返回给所述 数字电视广播手持设备中的电子服务指南浏览器。
进一步地，所述会话描述协议文件信息包括会话描述协议文件的绝对路 径及其文件名；
所述相关辅助属性信息包括会话描述协议的成员特性类型信息。
进一步地， 所述业务类型包括电视、 广播、 下载及其他类型； 所述成员特性类型包括视频、 音频、 下载及其他类型；
所述内容媒体类型包括电视、 广播、 下载及其他类型。
进一步地，所述相关辅助属性信息还包括会话描述协议文件对应的内容 媒体类型；
若所述用户指定的业务类型为电视类型， 当所述会话描述协议信息链表 中没有成员特性类型与所述业务类型相匹配的会话描述协议节点时，电子服 务指南浏览器返回电视类型中最大内容媒体类型优先级别的会话描述协议 节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文 件；
若所述用户指定的业务类型为广播类型 ,当所述会话描述协议信息链表 中没有成员特性类型与所述业务类型相匹配的会话描述协议节点时，电子服 务指南浏览器返回广播类型中最大内容媒体类型优先级别的会话描述协议 节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文 件。 进一步地， 若所述用户指定的业务类型为电视类型， 当所述会话描述协 议信息链表中有成员特性类型与所述业务类型相匹配的会话描述协议节点 时，电子服务指南浏览器返回所述成员特性类型与业务类型相匹配的会话描 述协议节点，将该节点对应的会话描述协议文件作为用户所需的会话描述十办 议文件
若所述用户指定的业务类型为广播类型， 当所述会话描述协议信息链表 中有成员特性类型与所述业务类型相匹配的会话描述协议节点时，电子服务 指南浏览器返回所述成员特性类型与业务类型相匹配的会话描述协议节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文件。
进一步地，所述电子服务指南浏览器返回最大内容媒体类型优先级别的 会话描述协议节点是指，所述电子服务指南浏览器设置一内容媒体类型优先 级别最小的初始会话描述协议节点的内容媒体类型优先级别，然后遍历所述 会话描述协议信息链表的各个节点， 若当前节点的成员特性类型为空， 则根 据其内容媒体类型设置所述当前节点的内容媒体类型优先级别 ,同时保存或 更新当前最大内容媒体类型优先级别及对应的会话描述协议节点，若当前节 点的成员特性类型不为空且与所述业务类型不相匹配，则取得所述会话描述 协议信息链表中的下一个节点， 当查找完所有节点后， 返回最大内容媒体类 型优先级别的会话描述协议节点。
进一步地， 所述步骤 c中， 若所述用户指定的业务类型为下载类型， 电 子服务指南浏览器遍历所述会话描述协议信息链表的各个节点，若当前节点 的成员特性类型为下载类型， 则返回所述当前会话描述协议节点， 否则取得 所述会话描述协议信息链表中的下一个节点，若所述链表中没有成员特性类 型为下载类型的会话描述协议节点则返回所述链表中第一个会话描述协议 节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文 件。
进一步地， 所述步骤 c中， 若所述用户指定的业务类型为其他类型， 电 子服务指南浏览器返回所述会话描述协议信息链表的第一个会话描述协议 节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文 件。 进一步地， 所述成员特性类型与业务类型相匹配是指： 当所述业务类型 为电视时， 成员特性类型若包括视频类型则与所述业务类型相匹配； 当所述 业务类型为广播时， 成员特性类型若为音频类型则与所述业务类型相匹配。
进一步地，所述根据当前节点的内容媒体类型设置所述节点的内容媒体 类型优先级别是根据所述内容媒体类型的常用性设置优先级别，越常用的对 应的优先级别越大。
综上所述，本发明提供了一种数字电视广播手持设备的会话描述协议文 件的获取方法， 可使手机电视在复杂的 ESG信息中快速、 准确地获取用户 选择业务频道所需的 SDP文件， 以实现相关的业务， 从而提高了 DVB-H手 机电视的整体性能。 附图概述
图 1是本发明方法的 SDP接收阶段、 SDP查询阶段和 SDP决策阶段的 总体流程图；
图 2是本发明提出的 DVB-H手机电视 SDP获取方法中 SDP接收阶段 的相关处理的流程图；
图 3是本发明提出的 DVB-H手机电视 SDP获取方法中 SDP查询阶段 的相关处理的流程图；
图 4是本发明提出的 DVB-H手机电视 SDP获取方法中 SDP决策阶段 的相关处理的流程图。
本发明的较佳实施方式
本发明提供一种数字电视广播手持设备的会话描述协议文件的获取方 法， 数字电视广播手持设备中包括有 ESG引擎和 ESG浏览器等相关的功能 模块。 ESG引擎通过借助获取段中的辅助属性信息（如音频、视频、下载等） 来选取该频道正确的 SDP文件。
下面将结合附图及实施例对本发明的技术方案进行更详细的说明。
如图 1所示， 本实施例基本分为三个阶段的处理， 即 SDP接收阶段的 处理、 SDP查询阶段的处理和 SDP决策阶段的处理。
其中， SDP的接收处理是在 ESG引擎接收 ESG信息的过程中进行的。 在 ESG信息中， 与 SDP相关的信息包含在业务段和获取段里， 因此当 ESG 引擎收到一个业务段时， 需将该段所有的获取段 ID号保存下来。 而当 ESG 引擎收到一个获取段时， 需将该段中内嵌的 SDP文件截取出来保存在本地 文件系统中， 同时记录下与 SDP相关的辅助属性信息。
如图 2所示，是本实施例方法在 DVB-H手机电视 SDP获取的接收阶段 相关处理步骤， 具体包括：
步骤 101 : 当 ESG引擎接收到一个 ESG数据段， 根据其中的段类型标 识判断数据段是否为 ESG业务段， 是则执行步骤 102, 否则执行步骤 103; 步驟 102: 记录该 ESG业务段中所有获取段的 ID号， 并以链表形式保 存下来， 执行步骤 105;
步骤 103: 判断该 ESG数据段是否为 ESG获取段， 是则执行步骤 104, 否则执行步骤 105;
步驟 104:将该获取段中内嵌的 SDP文件截取出来保存在本地文件系统 中， 并记录该 ESG获取段与 SDP相关的辅助属性信息， 保存在该获取段数 据结构中；
步骤 105: 判断是否已处理完所有的 ESG数据段， 是则结束， 否则返回 步骤 101。
所述 ESG获取段数据结构可定义如下：
(1)获取段 ID号；
(2)获取段成员描迷类型结构 ,业务段可能对应有多个获取段,一个获取 段就是一个成员；
(3)获取段的内容媒体类型；
内容媒体类型 ( contentMimeType, Specifies the content type from which the terminal can determine the consuming application of the service )包含在获耳又 段中，指从终端取得的需要消费的业务的内容类型，即用户选择的消费类型， 如电视、 广播、 文件下载等。 (4)指向下一个 ESG获取段结构。
在上面的数据结构中获取段成员描述类型的数据结构可定义如下： (1)成员特性类型结构；
(2)该成员对应的 SDP文件路径名；
(3)指向下一个成员描述类型结构。
以上 3项组成了一个 SDP文件的对应信息， 在一个获取段中可能包括 一个或多个 SDP文件的上述信息。
在上面结构中成员特性类型的数据结构定义如下：
( 1 )该成员特性对应的一个成员枚举类型；
( 2 )指向该成员特性的下一个成员枚举类型；
本实施例中， 该成员枚举类型包括：
a视频类型；
b音频类型；
c文件下载类型；
d其它类型。
一个获取段只对应一个内容媒体类型，一个获取段包含一个或多个成员 描述类型， 一个成员描述类型又包含一个或多个成员特性类型。 例如：
<Acquisition
acquisitionID="cbms：〃 telecomitalia.it/acquisition/xxx"〃该获耳又段的 ID contentMimeT pe=Mapplication/mpeg4-generic"> 〃该获取段的内容媒体 类型
<ComponentDescription> 〃该获取段下的成员描述类型 1 (它下面只 包含一个成员特性类型）
<ComponentCharacteristic xsi:type="esg:FileDownloadComponentType"
>〃该成员描述类型 1包含的一个成员特性类型， 这个成员特性类型是 文件下载
</ComponentDescription>
<ComponentDescription>//该获取段下的成员描述类型 2 (它下面包含两 个成员特性类型）
<ComponentCharacteristic xsi:type="esg:VideoComponentType" /〉〃该成 员描述类型 2包含的第一个成员特性类型， 这个成员特性类型是视频；
<ComponentCharacteristic xsi:type="esg:AudioComponentType" />〃该成 员描述类型 2包含的第二个成员特性类型， 这个成员特性类型是音频；
...
</ ComponentDescription>
</Acquisition>
在本实施例中， 各获取段的数据结构以链表形式关联，但本发明不局限 于某种具体的数据结构和保存方式， 只要有需要的信息即可。
其次， 本实施例 SDP的查询过程是当用户在手机电视上选择某个业务 频道中某个类型的业务进行消费时， ESG浏览器将该频道对应的业务 ID号 发送给 ESG引擎进行该业务所需的 SDP文件查询。 ESG引擎接收到业务 ID 号后通过查找并遍历对应的每个获取段数据结构， 将在第一步 SDP接收阶 段中保存的 SDP相关信息构造成一个 SDP信息链表返回给 ESG浏览器；如 图 3所示， 该查询阶段的相关处理步骤具体包括：
步骤 201： 当用户在手机电视上选择某个业务频道中某个类型的业务进 行消费时， ESG浏览器将该频道对应的业务 ID号发送给 ESG引擎进行 SDP 查询；
步骤 202: ESG引擎接收到业务 ID号后查找到该业务 ID号对应的所有 获取段 ID号， 在业务段中包含了该业务段对应的一个或多个获取段的 ID; 步驟 203: ESG引擎遍历每个获取段 ID号， 将在接收阶段保存的相应 获取段的相关信息构造成一个 SDP查询结果的信息链表， 该信息链表中每 个节点对应一个 SDP文件及其相关的辅助属性信息， 每个节点的数据结构 定义如下：
(1)该 SDP文件的绝对路径及其文件名；
(2)该 SDP的成员特性类型结构；
(3)该 SDP对应的内容媒体类型；
(4)指向下一个 SDP查询结果的节点；
再次， 本实施例 ESG浏覓器接收到 ESG引擎返回的 SDP信息链表后， 需要决策链表中哪个节点中的 SDP文件是用户在手机电视上选择的业务所 需要的。 根据 SDP文件的生成规则， 一个业务 ID对应的 SDP信息链表中， 只有一个 SDP节点的文件与用户所选择业务的业务类型相匹配。 如用户选 择的业务类型为电视时，成员特性类型中有视频时则认为两者相匹配， 如用 户选择的业务类型为广播时， 成员特性类型有音频时认为两者相匹配， 如用 户选择的业务类型为下载时， 成员特性类型为下载时认为两者相匹配。
ESG获取段中辅助属性数据有时候并不完整，例如有时服务器端为了提 高 ESG发送效率， 只提供了部分辅助属性（辅助属性只包含在 ESG获取段 中， 与 SDP文件中本身的数据结构没有关系） ， ESG引擎可能会错误地选 择 SDP文件, 造成不能实现用户选择的业务, 本发明还针对该问题提出了 设置 SDP文件的内容媒体类型优先级别， 当辅助属性信息不完整时返回最 如图 4所示， 决策阶段的处理过程如下所述：
步骤 301: 确定用户选择的业务类型， 并设置初始的 SDP节点的内容媒 体类型优先级别为最小， 比如可以但不限于设为 0;
业务类型包含在业务段中， 一般是指业务段的类型， 如电视、 广播、 下 载以及其它类型（如在线投票）等， 一个业务频道可对应于一个或多个业务 类型。
步驟 302: 取得 SDP查询结果的信息链表中的第一个节点； 步骤 303: 判断用户选择的业务类型是否属于电视， 若是执行步骤 304, 否则执行步骤 307;
步骤 304: 判断该 SDP节点上的成员特性类型是否为空， 即 ESG数据 本身有没有携带成员特性类型信息， 如果为空， 则执行步骤 305， 否则执行 步骤 306;
步骤 305:根据该节点的内容媒体类型确定当前 SDP节点的内容媒体类 型优先级别 ,并保存或更新与业务类型对应的当前最大的内容媒体类型优先 级别及其对应的 SDP节点编号， 执行步骤 311;
因用户在指定业务类型时一般只指定大致类型， 如指定电视、广播或下 载类型， 而电视或广播类型又存在很多子类型， 因此有必要根据 SDP节点 的内容媒体类型设置该节点内容媒体类型优先级别。
节点的媒体类型优先级根据该节点的内容媒体类型 (contentMimeType) 的常用性来设置， 如可将当地网络 ESG中最常用的如" video/mpeg4-generic" (视频 / mpeg4编码）等内容媒体类型的优先级别设为最高， 可以但不限于 将该类节点的媒体类型的优先级设为 1 , 较常用的如" application/mpeg-laser (应用 / mpeg编码） "等内容媒体类型的优先级别次之， 可以但不限于将该 类节点的媒体类型的优先级设为 0.5, 最不常用的如 "application/octet-stream (应用 /8位流） "等内容媒体类型的优先级别最低， 可以但不限于将该类节 点的媒体类型的优先级设为 0.1。
步骤 306: 遍历该节点的成员特性类型的所有成员枚举类型， 判断是否 有成员特性类型属于视频， 是则执行步驟 309; 否则执行步驟 311;
步驟 307: 判断用户选择的业务类型是否属于下载类型， 若是执行步骤 308, 否则执行步骤 310;
步骤 308: 遍历该节点的成员特性类型的所有成员枚举类型， 判断是否 有成员特性类型属于下载类型， 是则执行步骤 309, 否则执行步骤 311; 步骤 309: 返回该 SDP节点， 将该节点上对应的 SDP文件作为用户业 务需要的 SDP, 结束；
下载类型是比较特殊的一种类型， 类型单一， 不像电视或广播类型会有 很多子类型， 因此， 若业务类型和成员特性类型都是下载类型， 则说明业务 类型和成员特性类型完全兼容， 那么该 SDP 节点肯定是该业务所需要的 SDP。
步驟 310: 若业务类型属于其它类型， 直接返回该 SDP节点， 将该节点 上对应的 SDP文件作为其它类型业务需要的 SDP, 并结束；
这里其他业务类型是指电视、广播和下载以外的类型（如在线投票等）， 这些类型的业务段本身只对应一个获取段， 而且该获取段很简单， 就是一个 SDP文件， 即该类型只有一个节点， 所以在此就结束了。
步骤 311 : 取得 SDP查询结果的信息链表中的下一个节点， 若下一个节 点不为空， 则执行步骤 304, 否则执行步驟 312;
步骤 312: 返回最大内容媒体类型优先级别对应的 SDP节点， 将该节点 上对应的 SDP文件作为用户选择业务需要的 SDP， 并结束。
在 ESG中， 业务类型是下载类型的是比较特殊的一类， 如果一个业务 段对应多个 SDP,肯定有对应的成员特性类型为下载类型的 SDP; 如果没有 特别标明成员特性类型为下载类型，那么该情况肯定是该业务段只对应一个 获取段， 该获取段只对应一个 SDP, 该 SDP节点即为用户所需的节点。
当业务类型为广播时， 其判断逻辑及操作流程与业务类型为电视时类 似， 只是当业务类型为广播时， 若节点的成员特性类型有音频类型则认为与 业务类型匹配。
当然， 本发明还可有其他多种实施例， 在不背离本发明精神及其实质的 形， 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
本发明的方法并不是完全就保证能全部一次性找到正确的 SDP,但是一 种最优化的方法， 即尽可能利用当前网络中的已有信息来找到正确的 SDP。
工业实用性
本发明方法能在复杂的 ESG信息中能够快速、 准确地获取用户所需的 SDP文件， 同时在 ESG获取段辅助属性（如成员特性） 不完整的情况下也 能实现 SDP文件选取的正确性， 从而正常地实现相关的业务。 本发明方法 克服了常规方法依次输入该业务频道对应的 SDP文件， 直到获取到一个正 确的 SDP文件为止的弊端， 大大提高 DVB-H手机电视的整体性能。

Claims

权 利 要 求 书
1、 一种数字电视广播手持设备的会话描述协议文件的获取方法，包括： a、 数字电视广播手持设备接收电子服务指南信息的过程中， 将其中的 会话描述协议文件及其相关的辅助属性信息保存在本地文件系统；
b、 用户选择业务频道并指定业务类型， 所述数字电视广播手持设备根 据所述业务频道的业务标识查询到其对应的会话描述协议文件信息及其相 关的辅助属性信息；
c、 所述数字电视广播手持设备从查询到的所有会话描述协议文件信息 及其相关的辅助属性信息中，选择辅助属性信息与所述业务类型相匹配的会 话描述协议文件作为用户所需的会话描述协议文件。
2、 如权利要求 1所述的方法， 其特征在于：
所述步骤 a中，所述数字电视广播手持设备中的电子服务指南引擎收到 一个业务段时，保存所述业务段中所有获取段标识号， 当电子服务指南引擎 收到一个获取段时，将所述获取段中内嵌的会话描述协议文件截取出来保存 在本地文件系统中该获取段的数据结构中，同时在该数据结构中记录下与所 述会话描述协议相关的辅助属性信息。
3、 如权利要求 2所述的方法， 其特征在于：
所述步驟 b中，所述电子服务指南引擎根据所述业务标识查找到对应的 获取段并遍历这些获取段的数据结构，将各获取段中的会话描述协议文件信 息及其相关辅助属性信息生成一会话描述协议信息链表，每个获取段作为链 表中的一个节点，然后将所述会话描述协议信息链表返回给所述数字电视广 播手持设备中的电子服务指南浏览器。
4、 如权利要求 1至 3任一权利要求所述的方法， 其特征在于： 所述会话描述协议文件信息包括会话描述协议文件的绝对路径及其文 件名；
所述相关辅助属性信息包括会话描述协议的成员特性类型信息。
5、 如权利要求 4所述的方法， 其特征在于：
所述业务类型包括电视、 广播、 下载及其他类型；
所述成员特性类型包括视频、 音频、 下载及其他类型；
所述内容媒体类型包括电视、 广播、 下载及其他类型。
6、 如权利要求 5所述的方法， 其特征在于：
所述相关辅助属性信息还包括会话描述协议文件对应的内容媒体类型； 若所述用户指定的业务类型为电视类型，当所述会话描述协议信息链表 中没有成员特性类型与所述业务类型相匹配的会话描述协议节点时，电子服 务指南浏览器返回电视类型中最大内容媒体类型优先级别的会话描述协议 节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文 件；
若所述用户指定的业务类型为广播类型，当所述会话描述协议信息链表 中没有成员特' 1·生类型与所述业务类型相匹配的会话描述协议节点时，电子服 务指南浏览器返回广播类型中最大内容媒体类型优先级别的会话描述协议 节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文 件。
7、 如权利要求 5所述的方法， 其特征在于：
若所述用户指定的业务类型为电视类型，当所述会话描述协议信息链表 中有成员特性类型与所述业务类型相匹配的会话描述协议节点时，电子^ ^务 指南浏览器返回所述成员特性类型与业务类型相匹配的会话描述协议节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文件；
若所述用户指定的业务类型为广播类型，当所述会话描述协议信息链表 中有成员特性类型与所述业务类型相匹配的会话描述协议节点时，电子^ R务 指南浏览器返回所述成员特性类型与业务类型相匹配的会话描述协议节点， 将该节点对应的会话描述协议文件作为用户所需的会话描述协议文件。
8、 如权利要求 6所述的方法， 其特征在于：
所述电子服务指南浏覓器返回最大内容媒体类型优先级别的会话描述 协议节点是指，所述电子服务指南浏览器设置一内容媒体类型优先级别最小 的初始会话描述协议节点的内容媒体类型优先级别，然后遍历所述会话描述 协议信息链表的各个节点，若当前节点的成员特性类型为空， 则根据其内容 媒体类型设置所述当前节点的内容媒体类型优先级别，同时保存或更新当前 最大内容媒体类型优先级别及对应的会话描述协议节点，若当前节点的成员 特性类型不为空且与所述业务类型不相匹配，则取得所述会话描述协议信息 链表中的下一个节点， 当查找完所有节点后， 返回最大内容媒体类型优先级 别的会话描述协议节点。
9、 如权利要求 5所述的方法， 其特征在于：
所述步骤 c中， 若所述用户指定的业务类型为下载类型， 电子服务指南 浏览器遍历所述会话描述协议信息链表的各个节点，若当前节点的成员特性 类型为下载类型， 则返回所述当前会话描述协议节点， 否则取得所述会话描 述协议信息链表中的下一个节点，若所述链表中没有成员特性类型为下载类 型的会话描述协议节点则返回所述链表中第一个会话描述协议节点，将该节 点对应的会话描述协议文件作为用户所需的会话描述协议文件。
10、 如权利要求 5所述的方法， 其特征在于：
所述步骤 c中， 若所述用户指定的业务类型为其他类型， 电子服务指南 浏览器返回所述会话描述协议信息链表的第一个会话描述协议节点，将该节 点对应的会话描述协议文件作为用户所需的会话描述协议文件。
11、 如权利要求 6 、 7或 8所述的方法， 其特征在于：
所述成员特性类型与业务类型相匹配是指： 当所述业务类型为电视时， 成员特性类型若包括视频类型则与所述业务类型相匹配； 当所述业务类型为 广播时， 成员特性类型若为音频类型则与所述业务类型相匹配。
12、 如权利要求 8所述的方法， 其特征在于：
所述根据当前节点的内容媒体类型设置所述节点的内容媒体类型优先 级别是根据所述内容媒体类型的常用性设置优先级别，越常用的对应的优先 级别越大。
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