WO2008124990A1 - A digital television program switching method and a digital television device - Google Patents

A digital television program switching method and a digital television device Download PDF

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Publication number
WO2008124990A1
WO2008124990A1 PCT/CN2007/071345 CN2007071345W WO2008124990A1 WO 2008124990 A1 WO2008124990 A1 WO 2008124990A1 CN 2007071345 W CN2007071345 W CN 2007071345W WO 2008124990 A1 WO2008124990 A1 WO 2008124990A1
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WO
WIPO (PCT)
Prior art keywords
program
demand program
demand
identifier
target
Prior art date
Application number
PCT/CN2007/071345
Other languages
English (en)
French (fr)
Inventor
Anyuan Xiong
Ying Shi
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP07846171A priority Critical patent/EP2086235A4/en
Priority to BRPI0719348-3A priority patent/BRPI0719348A2/pt
Publication of WO2008124990A1 publication Critical patent/WO2008124990A1/zh
Priority to US12/427,096 priority patent/US20090204990A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17336—Handling of requests in head-ends
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
    • H04N21/25808—Management of client data
    • H04N21/25816—Management of client data involving client authentication
    • 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
    • H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4333—Processing operations in response to a pause request
    • 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
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
    • 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 
    • H04N21/65—Transmission of management data between client and server
    • H04N21/658—Transmission by the client directed to the server
    • H04N21/6581—Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application
    • 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]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845—Structuring of content, e.g. decomposing content into time segments
    • H04N21/8455—Structuring of content, e.g. decomposing content into time segments involving pointers to the content, e.g. pointers to the I-frames of the video stream

Definitions

  • the present invention relates to digital television technology, and more particularly to a digital television program switching method and digital television device.
  • digital TV home analog TV is gradually converting to digital TV.
  • the implementation of digital television generally generally delivers digital television broadcast programs through a broadcast channel and provides an interactive channel for the user to communicate with the digital television broadcast server.
  • digital TV can not only broadcast TV services, but also implement Video On Demand (VOD) services.
  • VOD Video On Demand
  • the user operates the control device (the remote controller, the set-top box control button, etc.) to exchange information with the VOD server through the set-top box, selects a program to be on-demand, and determines that the set-top box sends an on-demand command to the VOD server after the program, where the on-demand instruction includes at least the set-top box identifier,
  • the program identification that needs to be on-demand; the interaction process may be to determine a program to be on-demand by displaying a menu on a television screen, and the user performs one or more selections according to the menu;
  • the VOD server After receiving the on-demand command, the VOD server first authenticates the user.
  • Authentication can include:
  • the hybrid (Hybrid Fiber Coax, HFC) network receives the program code stream, and then uses the IP Quadrature Amplitude Modulation (IPQAM) to mix the program code stream played by the VOD server system into the digital television broadcast program stream, and simultaneously Sending feedback information including frequency information of the program code stream to the set top box through a network such as an HFC network, an IP network, or a mobile network; 105. If the VOD server system sends the program code stream through the HFC network, after the set top box receives the feedback information including the frequency point information, the set-top program code stream is decoded and played to the user by the playing device.
  • IPQAM IP Quadrature Amplitude Modulation
  • the set-top box receives the program stream through the HFC network.
  • the program stream can also be received through the IP network. Steps 104 and 105 are replaced by:
  • the VOD server system directly sends the on-demand stream to the set-top box through the IP network; 105', the set-top box receives the program code stream, decodes the program code stream, and plays the same to the user through a playback device (for example, a television).
  • a playback device for example, a television
  • the user can operate the control device to send a stop-to-on order to the VOD server through the set-top box, and the VOD server stops transmitting the program stream after receiving the command. , the end of the broadcast.
  • the technical problem to be solved by the present invention is to propose a digital television program switching method and a digital television device, which can allow a user to continue watching from the end of the last on-demand program when switching from another program to an on-demand program.
  • the method for switching a digital television program includes: when it is required to switch from a current live program to a target on-demand program, acquiring a pre-saved target on-demand program identifier and playing position information corresponding to the target on-demand program identifier ;
  • the program switching is completed by using the on-demand program identification and the playback location information.
  • a digital television device configured to receive an operation command of a user, and receive The information obtained is processed, and information is exchanged with the VOD server and the playback device, where the digital television device includes:
  • a first saving unit configured to save an identifier of the on-demand program, a play position information when the on-demand program stops playing, and a correspondence relationship between the on-demand programs after receiving an instruction to stop playing the on-demand program; Searching for the identifier of the target on-demand program and the playback location information corresponding to the identifier in the content saved by the first saving unit after receiving the instruction to switch to the target on-demand program;
  • a first sending unit configured to: when the first searching unit finds the identifier of the target on-demand program and the play location information corresponding to the identifier, send a play request including the on-demand program identifier and the play location information to the VOD server information.
  • the digital television device provided by the embodiment of the present invention is configured to receive an operation command of a user, process the received information, and perform information interaction with the VOD server and the playback device, where the digital television device includes:
  • a second saving unit configured to: after receiving the instruction to stop playing the on-demand program, save the identifier of the on-demand program, stop playing the current on-demand program, and preset the content of the on-demand program to a preset length, the saving The final play position information of the program content and the corresponding relationship between them;
  • a second searching unit configured to search for the identifier of the target on-demand program and the preset length corresponding to the identifier in the content saved by the second saving unit after receiving an instruction to switch to the target on-demand program The content of the program, the last play position information of the saved program content;
  • a second sending unit configured to send, after the second search unit finds the identifier of the target on-demand program and the last play position information corresponding to the identifier, to the VOD server, including the on-demand program identifier and the last play position Information playback request information.
  • the method and the device provided by the present invention save the identification information and information of the on-demand program that has been viewed by the user and the playback position information that has been viewed by the user. You can go back to the location you have seen, reduce the steps, make it simple and easy, and improve the user experience.
  • FIG. 1 is a flow chart of a user performing a video on demand service in the prior art
  • FIG. 2 is a schematic flow chart of a digital television program switching method according to an embodiment of the present invention
  • 3 is a schematic flowchart of a method for switching a digital television program according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic flow chart of a method for switching a digital television program according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a method for switching a digital television program according to an embodiment of the present invention
  • FIG. 6 is a schematic flow chart of a method for switching a digital television program according to a fifth embodiment of the present invention.
  • the present invention is a digital television program switching method and a digital television device. To further clarify the technical solutions and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.
  • the method for switching a digital television program after receiving an instruction to switch to a target on-demand program, according to the instruction, searching for a target on-demand program identifier in a pre-stored on-demand program identifier; if found, The corresponding relationship between the saved on-demand program identifier and the play position information acquires play position information corresponding to the target on-demand program identifier, and sends play request information including the on-demand program identifier and the play position information, thereby using the on-demand program identifier and the play position information. Complete the program switch.
  • the present invention also provides a digital television device applied to the above-described digital television program switching method. The methods and devices of the embodiments of the present invention are described in detail below.
  • Embodiment 1 A digital television program switching method, which is shown in FIG. 2, includes:
  • the user sends a switching program instruction to the set top box by operating the device (remote controller, set top box control button, etc.), requesting to switch from the currently playing on-demand program to another program;
  • the set top box receives the switching instruction, stops playing the on-demand program, saves the identifier of the on-demand program, the playback position information when the on-demand program stops playing, and the correspondence between them;
  • the playback location information is the progress information of the user watching the on-demand program, and may be the current playback time point, or the percentage of the currently completed playback;
  • the identifier of the on-demand program can be saved in the set-top box, the playback position information when the on-demand program is stopped, and the correspondence between them can be saved in the form of a list, for example, as shown in Table 1;
  • the user sends a switching program instruction to the set top box by operating the control device (remote controller, set top box control button, etc.), requesting to switch from the current program to the target on-demand program;
  • the control device remote controller, set top box control button, etc.
  • the set top box searches for the identifier of the target on-demand program in the pre-stored on-demand program identifier, and if not, performs A5, and if found, performs A7;
  • the set top box sends the play request information including the identifier of the set top box and the identifier of the target on-demand program to the VOD server.
  • the VOD server receives the play request information, and authenticates the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the target on-demand program stream to the set-top box, and the process ends;
  • This embodiment uses the IP network connection between the VOD server and the set-top box as an example.
  • the flow is slightly different.
  • the program code stream played by the VOD server system needs to be mixed with IPQAM.
  • the digital TV broadcast program stream is medium, and the other steps are exactly the same, so the situation when connecting with the HFC network will not be repeated here, and other embodiments are also the same;
  • the set top box acquires play position information corresponding to the identifier of the target on-demand program by the correspondence between the pre-stored on-demand program identifier and the play position information, and sends the play including the set-top box identifier, the identifier of the target on-demand program, and the play position information to the VOD server.
  • Request information ;
  • the VOD server receives the play request information, and authenticates the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the code of the target on-demand program starting from the saved play position to the set-top box. Flow, the process ends.
  • the embodiment of the present invention provides two different solutions.
  • the connection with the on-demand program is not disconnected. If the user wants to watch the on-demand program after watching the live program, the program code stream can be directly provided to the user by using the saved connection; 2. After the user finishes the on-demand program, save the on-demand program from the end time to the next length, and save the last position information of the on-demand program.
  • the saved program is first played to the user. The content, at the same time, sends the request information including the last location information to the VOD server. After the connection with the VOD server is successfully established, the program content provided by the VOD server can be played from the saved last position after the saved content is played.
  • Embodiment 2 A method for switching a digital television program, the process shown in FIG. 3, comprising:
  • the user sends a switching program instruction to the set top box by operating the device (remote controller, set top box control button, etc.), requesting to switch from the currently playing on-demand program to another live program;
  • the set top box receives the switching instruction, stops playing the on-demand program, saves the identifier of the on-demand program, the playback position information when the on-demand program stops playing, and the correspondence between them, and maintains the connection with the on-demand program;
  • the user When the user wants to switch from the live program to the target on-demand program, the user sends a switching program instruction to the set-top box by operating the control device (remote control, set-top box control button, etc.), and requests to switch from the live program to the target on-demand program;
  • the control device remote control, set-top box control button, etc.
  • the set top box determines whether there is currently a connection with the target on-demand program, and if so, performs B5, if otherwise, performs B6;
  • the set top box sends a request message for restoring playback to the VOD server, and the VOD server sends the program code stream of the target on-demand program through the existing connection, and ends the process;
  • the set top box searches for the identifier of the target on-demand program in the pre-stored on-demand program identification. If it cannot be found, proceed to B7, if it can be found, proceed to B9;
  • the set top box sends the play request information including the set top box identifier and the target on-demand program identifier to the VOD server.
  • the B8 and the VOD server receive the play request information, and authenticate the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the target on-demand program stream to the set-top box, and the process ends;
  • the set top box acquires play position information corresponding to the identifier of the target on-demand program by the correspondence between the pre-stored on-demand program identifier and the play position information, and sends a play request including the set-top box identifier, the identifier of the target-on-demand program, and the play position information to the VOD server. information;
  • the B10 and the VOD server receive the play request information, and authenticate the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the code of the target on-demand program starting from the saved play position to the set-top box. Flow, the process ends.
  • connection to the on-demand program is not disconnected, and the on-demand program can be quickly played to the user after switching to the on-demand program.
  • the following description shows that the user can quickly play the on-demand program to the user after switching to the on-demand program.
  • Embodiment 3 A method for switching a digital television program, the process shown in FIG. 4, comprising:
  • the user sends a switch program instruction to the set top box by operating the device (remote control, set top box control button, etc.), requesting to switch from the currently playing on-demand program to another program;
  • the set top box receives the switching instruction, stops playing the on-demand program, saves the identifier of the on-demand program, and the content of the on-demand program of the preset length from the time of receiving the switching instruction, the last playing position information of the program content, and the like Correspondence between
  • the preset length should be long enough to establish a connection with the VOD server while playing the length program to the user;
  • the user sends a switching program instruction to the set top box by operating the control device (remote controller, set top box control button, etc.), requesting to switch from the current program to the target on-demand program;
  • the control device remote controller, set top box control button, etc.
  • the set top box searches for the identifier of the target on-demand program in the saved program identifier. If it cannot be found, it performs C5, and if it can be found, performs C7;
  • the set top box sends the play request information including the set top box identifier and the target on-demand program identifier to the VOD server.
  • the C6 and the VOD server receive the play request information, and authenticate the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the target on-demand program stream to the set-top box, and the process ends;
  • the set-top box acquires a play position corresponding to the identifier of the target on-demand program by a correspondence between the pre-stored on-demand program identifier and the play position information.
  • the C9 and the VOD server receive the play request information, and authenticate the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resources and sends the save to the set top box from the save.
  • the code stream of the target on-demand program at the beginning of the playback position if the pre-saved content has not been played, the connection with the server is maintained, and the program code stream provided by the server is played immediately after the saved content is played, and the process ends.
  • the steps C7 and C8 and C9 have no sequence, and can be performed simultaneously.
  • the saved program is first played to the user, and then the playback request information is sent to the VOD server, when received by the server.
  • the program to be saved is played after the program is played, so that the user can watch the on-demand program immediately without having to wait for time.
  • the program content is a period of time from the time when the end of the on-demand program ends, and in fact, the program content of the time period from the end time may be saved, or may include a period of time forward. It also includes the content of the program for a while, and different storage methods can bring different viewing experience to the user.
  • the set top box automatically saves the playback position information of the on-demand program.
  • the user sometimes does not want to save the playback position information, so the user should be allowed to select whether to save the on-demand program.
  • the way of location information enhances the user experience.
  • Embodiments of the present invention provide a scheme for allowing a user to selectively save location information of an on-demand program, which is described in detail below.
  • Embodiment 4 A method for switching a digital television program, the process shown in FIG. 5, comprising:
  • the user sends a switching program instruction to the set top box by operating the device (remote controller, set top box control button, etc.), requesting to switch from the currently playing on-demand program to another program;
  • the set top box receives the switching instruction, stops playing the on-demand program, and provides a selection interface to the user, prompting the user to select whether to save the playing position information of the on-demand program;
  • the user sends a switching program instruction to the set top box by operating the control device (remote controller, set top box control button, etc.), requesting to switch from the current program to the target on-demand program;
  • the control device remote controller, set top box control button, etc.
  • the set top box searches for the identifier of the target on-demand program in the pre-stored on-demand program identification, and if not, D6 is performed, and if it can be found, D8 is performed;
  • the set top box sends the identifier of the set top box identifier and the target on-demand program to the VOD server. Play request information;
  • the D7 and the VOD server receive the play request information, and authenticate the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the target on-demand program code stream to the set-top box, and the process ends;
  • the set top box acquires play position information corresponding to the identifier of the target on-demand program by the correspondence between the pre-stored on-demand program identifier and the play position information, and sends the play including the set top box identifier, the target on-demand program identifier, and the play position information to the VOD server.
  • Request information ;
  • the D9 and the VOD server receive the play request information, and authenticate the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the code of the target on-demand program starting from the saved play position to the set-top box. Flow, the process ends.
  • the user when the current on-demand program is ended, the user may be prompted to select whether to save the play position information of the program. Similarly, when the on-demand program is played to the user, the user may also be prompted to select whether to save from the saved play position. Start playing, as detailed below.
  • Embodiment 5 A method for switching a digital television program, the process shown in FIG. 6 includes:
  • the user sends a switching program instruction to the set top box by operating the device (remote controller, set top box control button, etc.), requesting to switch from the currently playing on-demand program to another program;
  • the set top box receives the switching instruction, stops playing the on-demand program, saves the identifier of the on-demand program, the playback position information when the on-demand program stops playing, and the corresponding relationship between them;
  • the user sends a switching program instruction to the set top box by operating the control device (remote controller, set top box control button, etc.), requesting to switch from the current program to the target on-demand program;
  • the control device remote controller, set top box control button, etc.
  • the set top box searches for the identifier of the target on-demand program in the pre-stored on-demand program identifier, and if not, performs E5, if it can be found, performs E7;
  • the set top box sends, to the VOD server, play request information including an identifier of the set top box and an identifier of the target on-demand program;
  • the E6 and the VOD server receive the play request information, and authenticate the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the target on-demand program stream to the set-top box, and the process ends;
  • E7 providing a selection interface to the user, prompting the user to select whether to start playing the on-demand program from the saved play position, if the user selects yes, then performing E8, if the user selects otherwise, performing E5; E8.
  • the set top box acquires play position information corresponding to the identifier of the target on-demand program by the correspondence between the pre-stored on-demand program identifier and the play position information, and sends the play including the set top box identifier, the target on-demand program identifier, and the play position information to the VOD server. Request information;
  • the E9 and the VOD server receive the play request information, and authenticate the user according to the set top box identifier. After the authentication is passed, the VOD server coordinates the on-demand resource, and sends the code of the target on-demand program starting from the saved play position to the set-top box. Flow, the process ends.
  • the embodiment of the present invention further provides a solution for the user to maintain a connection with the on-demand program when the user switches from the on-demand program to the live program, so that the user can switch from the live program back to the on-demand program without waiting for the solution.
  • users watch on-demand programs they generally need to wait for a period of defects, which improves the user experience.
  • the embodiment of the present invention also provides a scheme for the user to save a portion of the on-demand program content when the user ends the on-demand program, which is beneficial for the user to switch to the on-demand program again without waiting for the program to be immediately enjoyed, and playing the saved program for the user.
  • establishing a connection with the server saves the user's time and improves the user experience.
  • the embodiment of the invention further provides a scheme for the user to selectively save the play position or selectively play the on-demand program from the saved play position, and pays attention to the user's usage habits and personal wishes, thereby further improving the user experience. .
  • the embodiment of the present invention further provides a digital television device, which is configured to receive an operation command of a user, process the received information, and perform information interaction with the VOD server and the playback device, where the digital television device includes:
  • a saving unit configured to save an identifier of the on-demand program, a play position information when the on-demand program stops playing, and a correspondence relationship between the on-demand programs after receiving an instruction to stop playing the on-demand program;
  • a searching unit configured to search for an identifier of the target on-demand program and play position information corresponding to the identifier in a content saved by the saving unit after receiving an instruction to switch to the target on-demand program;
  • a sending unit configured to send, when the search unit finds the identifier of the target on-demand program and the play location information corresponding to the identifier, to the VOD server, including the on-demand program identifier and the play location letter Play request information.
  • the object of the present invention can be basically achieved by the above digital television device. To further enhance the beneficial effects of the embodiments of the present invention, the following improvements can be made on the basis of the above digital television device: Adding a connection holding unit and a connection judging unit:
  • connection holding unit configured to maintain a connection with the on-demand program after receiving an instruction to switch from an on-demand program to a live program
  • connection determining unit configured to determine, after receiving the instruction to switch to the on-demand program, whether the connection with the on-demand program is currently maintained
  • the sending unit is further configured to: after the connection determining unit determines that the connection with the on-demand program is currently maintained, send the request information for resume playback to the VOD server.
  • the embodiment of the present invention further provides a digital television device, which is configured to receive an operation command of a user, process the received information, and perform information interaction with the VOD server and the playback device, where the digital television device includes:
  • a saving unit configured to: after receiving an instruction to stop playing an on-demand program, save the identifier of the on-demand program, stop playing the current on-demand program, and preset the length of the content of the on-demand program, the saved program The end play position information of the content and the corresponding relationship between them;
  • a search unit configured to search, in the content saved by the saving unit, the identifier of the target on-demand program and the content of the on-demand program of a preset length corresponding to the identifier, after receiving an instruction to switch to the target on-demand program, The last play position information of the saved program content;
  • a sending unit configured to: after the searching unit finds the identifier of the target on-demand program and the last play position information corresponding to the identifier, send a play request including the on-demand program identifier and the last play position information to the VOD server information.
  • digital television device of the embodiment of the present invention may further include:
  • a playing unit configured to play a preset preset on-demand program content corresponding to the on-demand program identifier, and play the target on-demand program from the last playing position after playing the pre-saved on-demand program content .
  • the prompting unit is configured to prompt the user whether to save the information and the corresponding relationship through the selection interface, and/or prompt the user whether to start playing the target on-demand program from the last playing position.

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

Description

一种数字电视节目切换方法与数字电视设备
本申请要求于 2007 年 4 月 11 日提交中国专利局、 申请号为 200710079488.1、 发明名称为"一种数字电视节目切换方法与数字电视设备"的 中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及数字电视技术，尤其涉及一种数字电视节目切换方法与数字电 视设备。
背景技术
随着数字电视技术的发展， 家庭模拟电视正在逐步向数字电视转换。数字 电视的实现方式一般是通过广播信道下发数字电视广播节目，并提供交互通道 供用户和数字电视广播服务器进行通信。数字电视与传统的模拟电视的业务差 别体现在数字电视不仅可以进行广播电视业务， 还可以实现视频点播（Video On Demand, VOD ) 业务。
如图 1所示， 现有技术中， 用户进行视频点播业务时的流程如下：
101、用户操作控制设备（遥控器、机顶盒控制按钮等）通过机顶盒与 VOD 服务器进行信息交互， 选择需要点播的节目， 确定节目后机顶盒向 VOD服务 器发送点播指令， 所述点播指令至少包括机顶盒标识、 需要点播的节目标识； 该交互过程可以是通过在电视屏幕上显示菜单，用户根据菜单进行一次或 者多次选择的方式确定需要点播的节目；
102、 VOD服务器收到点播指令后， 首先对用户进行鉴权；
鉴权可以包括：
a、 根据机顶盒标识判断用户是否具有点播权限；
b、根据节目标识及机顶盒标识判断用户的账户余额是否足够点播该节目； 103、 若用户通过鉴权， VOD服务器协调点播资源， 发送点播节目码流； 104、 若该机顶盒需要通过光纤同轴电缆混合（Hybrid Fiber Coax, HFC ) 网络接收节目码流， 则利用 IP正交幅度调制器 (Internet Protocol Quadrature Amplitude Modulation, IPQAM )将 VOD服务器系统播放的节目码流混合到数 字电视广播节目流中， 同时通过 HFC网络、 IP网或移动网等网络向该机顶盒 发送包括该节目码流频点信息的反馈信息； 105、 若 VOD服务器系统通过 HFC网络发送节目码流， 则当机顶盒收到 包括所述频点信息的反馈信息后，对该点播节目码流进行解码， 通过播放设备 播放给用户。
在上面这个例子中， 机顶盒通过 HFC网络接收节目码流， 实际中， 若机 顶盒为 IPTV机顶盒或 IPTV/DTV双模机顶盒， 则还可以通过 IP网络接收节 目码流， 此时只需将上例中的步骤 104、 105分别换成：
104'、 VOD服务器系统直接通过 IP网络将点播码流发送给该机顶盒； 105'、机顶盒接收该节目码流，对该节目码流进行解码，通过播放设备（例 如： 电视机）播放给用户。
若用户在点播的过程中希望观看一下其他直播或点播节目时， 此时， 用户 可以操作控制设备通过机顶盒向 VOD服务器端发送停止点播的指令， VOD服 务器端收到指令后， 停止发送节目码流， 点播结束。
当用户观看完其他直播或点播节目后，希望继续收看之前观看的点播节目 时， 再重新进行点播的操作， 但是接收到点播节目后， 节目需要重新从开始位 置播放， 用户可以通过选择快进、 定位播放时间点等设备支持的方式回到上次 播放结束的地方，但是快进或定位播放时间的方式比较繁瑣， 而且常常也不能 准确地回到已观看到的位置。
综上所述，可以发现现有技术具有当用户想切换回曾经看过但是未看完的 点播节目时， 无法简捷准确地回到已观看到的位置的缺点， 用户体验较差。 发明内容
本发明要解决的技术问题是提出一种数字电视节目切换方法及数字电视 设备，可以让用户从其他节目切换到点播节目时从上次点播节目结束的地方继 续观看。
本发明实施例提供的一种数字电视节目切换方法， 包括： 当需要从当前直播节目切换到目标点播节目时，获取预先保存的目标点播 节目标识及与所述目标点播节目标识对应的播放位置信息；
利用所述点播节目标识及播放位置信息完成节目切换。
本发明实施例提供的一种数字电视设备， 用于接收用户的操作命令、对收 到的信息进行处理、 与 VOD服务器及播放设备进行信息交互， 其中， 所述数 字电视设备包括：
第一保存单元，用于当收到停止播放点播节目的指令后保存所述点播节目 的标识、 所述点播节目停止播放时的播放位置信息及它们之间的对应关系； 第一查找单元，用于当收到切换到目标点播节目的指令后在所述第一保存 单元保存的内容中查找所述目标点播节目的标识及所述标识对应的播放位置 信息；
第一发送单元，用于当所述第一查找单元查找到所述目标点播节目的标识 及所述标识对应的播放位置信息后向 VOD服务器发送包括所述点播节目标识 及播放位置信息的播放请求信息。
本发明实施例提供的一种数字电视设备， 用于接收用户的操作命令、对收 到的信息进行处理、 与 VOD服务器及播放设备进行信息交互， 其中， 所述数 字电视设备包括：
第二保存单元， 用于当收到停止播放点播节目的指令后，保存所述点播节 目的标识、停止播放当前点播节目的时刻起向后预设长度的所述点播节目的内 容、 所述保存的节目内容的末播放位置信息及它们之间的对应关系；
第二查找单元，用于当收到切换到目标点播节目的指令后在所述第二保存 单元保存的内容中查找所述目标点播节目的标识及所述标识对应的预设长度 的所述点播节目的内容、 所述保存的节目内容的末播放位置信息；
第二发送单元，用于当所述第二查找单元查找到所述目标点播节目的标识 及所述标识对应的末播放位置信息后向， 向 VOD服务器发送包括所述点播节 目标识及末播放位置信息的播放请求信息。
从以上技术方案可以看出， 本发明提供的方法及设备，通过保存用户曾收 看过的点播节目标识及结束收看的播放位置信息， 当再次收看该点播节目时， 通过该保存的标识及信息就可以回到曾经收看到的位置， 减少了操作步骤， 方 便简洁， 改善了用户体验。
附图说明
图 1为现有技术中用户进行视频点播业务时的流程图；
图 2为本发明实施例一数字电视节目切换方法流程示意图； 图 3为本发明实施例二数字电视节目切换方法流程示意图；
图 4为本发明实施例三数字电视节目切换方法流程示意图；
图 5为本发明实施例四数字电视节目切换方法流程示意图；
图 6为本发明实施例五数字电视节目切换方法流程示意图。
具体实施方式
本发明为一种数字电视节目切换的方法与数字电视设备，为使本发明的技 术方案、 及优点更加清楚明白， 以下参照附图并举实施例， 对本发明进一步详 细说明。
本发明实施例提供的一种数字电视节目切换方法，在收到切换到目标点播 节目的指令后，根据该指令，在预先保存的点播节目标识中查找目标点播节目 标识； 若找到， 则由预先保存的点播节目标识与播放位置信息的对应关系获取 与该目标点播节目标识对应的播放位置信息，发送包括该点播节目标识及播放 位置信息的播放请求信息，从而利用该点播节目标识及播放位置信息完成节目 切换。本发明还提供应用于上述数字电视节目切换方法的数字电视设备。 以下 分别对本发明实施例方法和设备进行详细说明。
实施例一、 一种数字电视节目切换方法， 流程如图 2所示， 包括：
Al、 用户通过操作设备（遥控器、 机顶盒控制按钮等） 向机顶盒发送切 换节目指令， 要求从当前播放的点播节目切换到另一节目；
A2、 机顶盒收到切换指令， 停止播放点播节目， 保存该点播节目的标识、 该点播节目停止播放时的播放位置信息及它们之间的对应关系；
播放位置信息即为用户收看点播节目的进度信息，具体可以为当前播放时 间点、 或者当前完成播放的百分比等；
可以在机顶盒保存点播节目的标识、点播节目停止播放时的播放位置信息 及它们之间的对应关系， 可以以列表的形式来保存这些内容， 例如可以如表一 所示；
序号 节目标识 播放位置信息 表一
A3、 任意时刻， 用户通过操作控制设备（遥控器、 机顶盒控制按钮等） 向机顶盒发送切换节目指令， 要求从当前节目切换到目标点播节目；
A4、 机顶盒在预先保存的点播节目标识中查找该目标点播节目的标识， 若不能找到则进行 A5 , 若可以找到则进行 A7;
A5、机顶盒向 VOD服务器发送包括机顶盒标识、 目标点播节目的标识的 播放请求信息；
A6、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送目标点播节 目码流， 流程结束；
本实施例以 VOD服务器与机顶盒之间通过 IP网连接为例进行说明， 当 VOD 服务器与机顶盒之间通过 HFC 网络连接时流程稍有不同， 需要利用 IPQAM将 VOD服务器系统播放的节目码流混合到数字电视广播节目流中等， 其他步骤完全相同， 所以在此不再赘述以 HFC网络连接时的情况， 其他实施 例也是如此；
A7、 机顶盒由预先保存的点播节目标识与播放位置信息的对应关系获取 与该目标点播节目的标识对应的播放位置信息， 向 VOD服务器发送包括机顶 盒标识、 目标点播节目的标识及播放位置信息的播放请求信息；
A8、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送从所述保存 的播放位置开始的目标点播节目的码流， 流程结束。
在上述实施例中， 当用户向目标点播节目切换时， 由于 VOD服务器仍然 要进行鉴权、 协调点播资源、 发送等工作， 所以用户向目标点播节目切换时将 需要等待一段时间才可以收看目标点播节目，为了能让用户不必等待就可以从 上次播放结束的位置继续观看点播节目，本发明实施例提供了两种不同的解决 方案， 以下先进行简要说明：
一、 当用户由点播节目切换到直播节目时， 不断开与该点播节目的连接， 如果用户收看完直播节目后想要收看该点播节目时，可以直接利用保存的连接 向用户提供节目码流； 二、当用户结束点播节目后，保存结束时刻起至后一段长度的该点播节目， 并保存该点播节目的末位置信息， 当用户想要再次收看该点播节目时， 先向用 户播放保存的节目内容， 同时向 VOD服务器发送包括该末位置信息的请求信 息， 当与 VOD服务器的连接建立成功后， 就可以在保存的内容播放完之后从 保存的末位置开始播放由 VOD服务器提供的节目内容。
以下分别结合实例进行说明。
实施例二、 一种数字电视节目切换方法， 流程如图 3所示， 包括：
Bl、 用户通过操作设备（遥控器、 机顶盒控制按钮等） 向机顶盒发送切 换节目指令， 要求从当前播放的点播节目切换到另一直播节目；
B2、 机顶盒收到该切换指令， 停止播放点播节目， 保存点播节目的标识、 点播节目停止播放时的播放位置信息及它们之间的对应关系，保持与点播节目 的连接；
B3、 用户想要从直播节目切换到目标点播节目时， 用户通过操作控制设 备（遥控器、 机顶盒控制按钮等）向机顶盒发送切换节目指令， 要求从直播节 目切换到目标点播节目；
B4、机顶盒判断当前是否存在与该目标点播节目的连接，若是则进行 B5, 若否则进行 B6;
B5、 机顶盒向 VOD服务器发送恢复播放的请求信息， VOD服务器通过 已存在的连接发送该目标点播节目的节目码流， 结束流程；
B6、 机顶盒在预先保存的点播节目标识中查找目标点播节目的标识， 若 不能找到则进行 B7, 若可以找到则进行 B9;
B7、 机顶盒向 VOD服务器发送包括机顶盒标识、 目标点播节目标识的播 放请求信息；
B8、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送目标点播节 目码流， 流程结束；
B9、 机顶盒由预先保存的点播节目标识与播放位置信息的对应关系获取 与目标点播节目的标识对应的播放位置信息， 向 VOD服务器发送包括机顶盒 标识、 目标点播节目的标识及播放位置信息的播放请求信息； B10、 VOD服务器收到该播放请求信息，根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送从所述保存 的播放位置开始的目标点播节目的码流， 流程结束。
以上说明了使用不断开与点播节目的连接的方式，当切换到点播节目后可 以迅速向用户播放点播节目的具体实施例，以下说明另一在用户切换到点播节 目后可以迅速向用户播放点播节目的具体实施例。
实施例三、 一种数字电视节目切换方法， 流程如图 4所示， 包括：
Cl、 用户通过操作设备（遥控器、 机顶盒控制按钮等） 向机顶盒发送切 换节目指令， 要求从当前播放的点播节目切换到另一节目；
C2、 机顶盒收到该切换指令， 停止播放点播节目， 保存该点播节目的标 识、收到切换指令的时刻起向后预设长度的点播节目的内容、该节目内容的末 播放位置信息及它们之间的对应关系；
所述的预设长度应足够长， 可以在向用户播放该长度节目的同时建立与 VOD服务器的连接；
C3、 任意时刻， 用户通过操作控制设备（遥控器、 机顶盒控制按钮等） 向机顶盒发送切换节目指令， 要求从当前节目切换到目标点播节目；
C4、 机顶盒在保存的节目标识中查找目标点播节目的标识， 若不能找到 则进行 C5, 若可以找到则进行 C7;
C5、 机顶盒向 VOD服务器发送包括机顶盒标识、 目标点播节目标识的播 放请求信息；
C6、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送目标点播节 目码流， 流程结束；
C7、 播放预先保存的与该点播节目标识对应的预设长度的点播节目内容； C8、 机顶盒由预先保存的点播节目标识与播放位置信息的对应关系获取 与该目标点播节目的标识对应的播放位置信息， 向 VOD服务器发送包括机顶 盒标识、 目标点播节目标识及播放位置信息的播放请求信息；
C9、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送从所述保存 的播放位置开始的目标点播节目的码流， 若此时预先保存的内容尚未播放完， 则保持与服务器的连接，当保存的内容播放完后立刻播放服务器提供的节目码 流， 流程结束。
在上面的实施例中， 步骤 C7与 C8、 C9并无先后顺序， 可以同时进行， 通常情况下， 先向用户播放已保存的节目， 然后向 VOD服务器发送播放请求 信息， 当接收到服务器发送的节目码流后，待保存的节目播放完就播放接收到 的节目， 这样可以让用户不必花时间等待就可以立刻观赏点播节目。
在上面的实施例中，是当结束点播节目时保存结束的时刻起向后一段时间 的节目内容， 实际上， 也可以保存结束时刻起向前一段时间的节目内容， 或者 既包括向前一段时间又包括向后一段时间的节目内容，不同的保存方式可以给 用户带来不同的观赏节目的体验。
在上述实施例中， 当用户由点播节目切换到其他节目时，机顶盒自动保存 点播节目的播放位置信息， 实际上， 用户有时并不希望保存该播放位置信息， 所以应当让用户选择是否保存点播节目的位置信息的方式更能增强用户的使 用体验。
本发明实施例提供了可以让用户有选择地保存点播节目的位置信息的方 案， 以下详细说明。
实施例四、 一种数字电视节目切换方法， 流程如图 5所示， 包括：
Dl、 用户通过操作设备（遥控器、 机顶盒控制按钮等） 向机顶盒发送切 换节目指令， 要求从当前播放的点播节目切换到另一节目；
D2、 机顶盒收到该切换指令， 停止播放点播节目， 向用户提供选择界面， 提示用户选择是否保存该点播节目的播放位置信息；
D3、 若用户选择保存点播节目的播放位置信息， 则保存该点播节目的标 识、 该点播节目停止播放时的播放位置信息及它们之间的对应关系；
D4、 任意时刻， 用户通过操作控制设备（遥控器、 机顶盒控制按钮等） 向机顶盒发送切换节目指令， 要求从当前节目切换到目标点播节目；
D5、 机顶盒在预先保存的点播节目标识中查找该目标点播节目的标识， 若不能找到则进行 D6 , 若可以找到则进行 D8；
D6、机顶盒向 VOD服务器发送包括机顶盒标识、 目标点播节目的标识的 播放请求信息；
D7、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送该目标点播 节目码流， 流程结束；
D8、 机顶盒由预先保存的点播节目标识与播放位置信息的对应关系获取 与该目标点播节目的标识对应的播放位置信息， 向 VOD服务器发送包括机顶 盒标识、 目标点播节目的标识及播放位置信息的播放请求信息；
D9、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送从所述保存 的播放位置开始的目标点播节目的码流， 流程结束。
在上面这个实施例中， 当结束当前点播节目时， 可以先提示用户选择是否 保存节目的播放位置信息， 类似地， 当向用户播放点播节目时， 也可以先提示 用户选择是否从保存的播放位置开始播放， 以下详细说明。
实施例五、 一种数字电视节目切换方法， 流程如图 6所示， 包括：
El、 用户通过操作设备（遥控器、 机顶盒控制按钮等）向机顶盒发送切换 节目指令， 要求从当前播放的点播节目切换到另一节目；
E2、机顶盒收到该切换指令，停止播放点播节目，保存该点播节目的标识、 点播节目停止播放时的播放位置信息及它们之间的对应关系；
E3、 任意时刻， 用户通过操作控制设备（遥控器、 机顶盒控制按钮等）向 机顶盒发送切换节目指令， 要求从当前节目切换到目标点播节目；
E4、机顶盒在预先保存的点播节目标识中查找该目标点播节目的标识，若 不能找到则进行 E5, 若可以找到则进行 E7;
E5、 机顶盒向 VOD服务器发送包括机顶盒标识、 目标点播节目的标识的 播放请求信息；
E6、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送目标点播节 目码流， 流程结束；
E7、向用户提供选择界面，提示用户选择是否从保存的播放位置开始播放 所述点播节目， 若用户选择是则进行 E8, 若用户选择否则进行 E5; E8、机顶盒由预先保存的点播节目标识与播放位置信息的对应关系获取与 该目标点播节目的标识对应的播放位置信息， 向 VOD服务器发送包括机顶盒 标识、 目标点播节目的标识及播放位置信息的播放请求信息；
E9、 VOD服务器收到该播放请求信息， 根据其中的机顶盒标识对用户进 行鉴权， 鉴权通过后， VOD服务器协调点播资源， 向机顶盒发送从所述保存 的播放位置开始的目标点播节目的码流， 流程结束。
通过上面的叙述可以发现，通过本发明一种数字电视节目切换方法的实施 例，当用户切换回近期曾收看过的点播节目时可以自动地为用户从上次结束的 地方播放该节目， 节省了用户的时间， 改善了用户的使用体验。
进一步地， 本发明实施例还提供了当用户由点播节目切换到直播节目时， 为用户保持与该点播节目的连接的方案，可以让用户从直播节目再切换回该点 播节目时不必等待，解决了用户收看点播节目时一般都需要等待一段时间的缺 陷， 改善了用户的使用体验。
本发明实施例还给出了当用户结束点播节目时为用户保存一段该点播节 目内容的方案，有利于用户再次切换到该点播节目后可以不必等待立刻欣赏该 节目， 为用户播放保存的节目的同时与服务器建立连接， 节省了用户的时间， 改善了用户的使用体验。
本发明实施例还给出了让用户有选择地进行保存播放位置或有选择地从 保存的播放位置播放点播节目的方案， 重视了用户的使用习惯与个人意愿， 进 一步地改善了用户的使用体验。
本发明实施例还提供了一种数字电视设备， 用于接收用户的操作命令、对 收到的信息进行处理、 与 VOD服务器及播放设备进行信息交互， 其中， 所述 数字电视设备包括：
保存单元，用于当收到停止播放点播节目的指令后保存所述点播节目的标 识、 所述点播节目停止播放时的播放位置信息及它们之间的对应关系；
查找单元，用于当收到切换到目标点播节目的指令后在保存单元保存的内 容中查找所述目标点播节目的标识及所述标识对应的播放位置信息；
发送单元，用于当查找单元查找到所述目标点播节目的标识及所述标识对 应的播放位置信息后向 VOD服务器发送包括所述点播节目标识及播放位置信 息的播放请求信息。
通过上述数字电视设备基本可以实现本发明的目的，为进一步增强本发明 实施例的有益效果， 在上述数字电视设备的基础上， 还可以作以下改进： 增加连接保持单元与连接判断单元：
连接保持单元， 用于当收到从点播节目切换到直播节目的指令后，保持与 所述点播节目的连接；
连接判断单元， 用于当收到切换到点播节目的指令后， 判断当前是否保持 了与所述点播节目的连接；
所述发送单元还用于：当连接判断单元判断得出当前保持了与所述点播节 目的连接后， 向 VOD服务器发送恢复播放的请求信息。
本发明实施例还提供了一种数字电视设备， 用于接收用户的操作命令、对 收到的信息进行处理、 与 VOD服务器及播放设备进行信息交互， 其中， 所述 数字电视设备包括：
保存单元， 用于当收到停止播放点播节目的指令后，保存所述点播节目的 标识、 停止播放当前点播节目的时刻起向后预设长度的所述点播节目的内容、 所述保存的节目内容的末播放位置信息及它们之间的对应关系；
查找单元，用于当收到切换到目标点播节目的指令后在所述保存单元保存 的内容中查找所述目标点播节目的标识及所述标识对应的预设长度的所述点 播节目的内容、 所述保存的节目内容的末播放位置信息；
发送单元，用于当所述查找单元查找到所述目标点播节目的标识及所述标 识对应的末播放位置信息后向， 向 VOD服务器发送包括所述点播节目标识及 末播放位置信息的播放请求信息。
另外， 本发明实施例的数字电视设备， 还可以包括：
播放单元，用于播放预先保存的与所述点播节目标识对应的预设长度的点 播节目内容，在播放完所述预先保存的点播节目内容后从所述末播放位置起播 放所述目标点播节目。
为了方便用户的使用， 还可以包括：
提示单元， 用于通过选择界面提示用户是否保存所述信息及对应关系， 和 /或提示用户是否从所述末播放位置开始播放所述目标点播节目。 以上对本发明所提供的一种数字电视节目切换方法与数字电视设备的详 实施例的说明只是用于帮助理解本发明的方法及其核心思想； 同时，对于本领 域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有 改变之处， 综上所述， 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种数字电视节目切换方法， 其特征在于， 包括：
当需要从当前直播节目切换到目标点播节目时，获取预先保存的目标点播 节目标识及与所述目标点播节目标识对应的播放位置信息；
利用所述点播节目标识及播放位置信息完成节目切换。
2、 如权利要求 1所述的数字电视节目切换方法， 其特征在于， 所述方法 还包括：
收到停止播放点播节目的指令后，保存所述点播节目的标识、所述点播节 目停止播放时的播放位置信息及它们之间的对应关系。
3、 如权利要求 2所述的数字电视节目切换方法， 其特征在于， 所述利用 所述点播节目标识及播放位置信息完成节目切换的过程包括：
从所述播放位置开始播放所述目标点播节目。
4、 如权利要求 1所述的数字电视节目切换方法， 其特征在于， 所述方法 还包括：
收到停止播放点播节目的指令后，保存所述点播节目的标识、停止播放当 前点播节目的时刻起向后预设长度的所述点播节目的内容、所述保存的节目内 容的末播放位置信息及它们之间的对应关系。
5、 如权利要求 4所述的数字电视节目切换方法， 其特征在于， 所述利用 所述点播节目标识及播放位置信息完成节目切换的过程包括：
播放预先保存的与所述点播节目标识对应的预设长度的点播节目内容，在 播放完所述预先保存的点播节目内容后从所述末播放位置起播放所述目标点 播节目。
6、 如权利要求 2或 4所述的数字电视节目切换方法， 其特征在于， 所述 方法还包括：
收到停止播放点播节目的指令后，通过选择界面提示用户是否保存所述信 息及对应关系；
当收到用户发送的确定保存的消息后， 保存所述信息及对应关系。
7、 如权利要求 3或 5所述的数字电视节目切换方法， 其特征在于， 所述 方法还包括： 在播放所述点播节点之前，通过选择界面提示用户是否从预先保存的播放 位置开始播放所述目标点播节目；
当收到用户发送的确定从预先保存的播放位置开始播放所述目标点播节 目的消息后， 发送包括所述点播节目标识及播放位置信息的播放请求信息。
8、 如权利要求 1所述的数字电视节目切换方法， 其特征在于， 所述方法 还包括：
收到停止播放点播节目并切换到直播节目的指令；
保持与所述点播节目的连接。
9、 如权利要求 8所述的数字电视节目切换方法， 其特征在于， 在所述获 取预先保存的目标点播节目标识及与所述目标点播节目标识对应的播放位置 信息之前还包括：
如果当前存在与所述目标点播节目的连接， 则发送恢复播放的请求信息。
10、 一种数字电视设备， 其特征在于， 包括：
第一保存单元， 用于当收到停止播放点播节目的指令后，保存所述点播节 目的标识、 所述点播节目停止播放时的播放位置信息及它们之间的对应关系； 第一查找单元，用于当收到切换到目标点播节目的指令后在所述第一保存 单元保存的内容中查找所述目标点播节目的标识及所述标识对应的播放位置 信息；
第一发送单元，用于当所述第一查找单元查找到所述目标点播节目的标识 及所述标识对应的播放位置信息后， 向 VOD服务器发送包括所述点播节目标 识及播放位置信息的播放请求信息。
11、 如权利要求 10所述的数字电视设备， 其特征在于，
还包括：
连接保持单元， 用于当收到从点播节目切换到直播节目的指令后，保持与 所述点播节目的连接；
连接判断单元， 用于当收到切换到点播节目的指令后， 判断当前是否保持 了与所述点播节目的连接；
所述发送单元还用于：当连接判断单元判断得出当前保持了与所述点播节 目的连接后， 向 VOD服务器发送由恢复播放的请求信息。
12、 一种数字电视设备， 其特征在于， 包括：
第二保存单元， 用于当收到停止播放点播节目的指令后，保存所述点播节 目的标识、停止播放当前点播节目的时刻起向后预设长度的所述点播节目的内 容、 所述保存的节目内容的末播放位置信息及它们之间的对应关系；
第二查找单元，用于当收到切换到目标点播节目的指令后在所述第二保存 单元保存的内容中查找所述目标点播节目的标识及所述标识对应的预设长度 的所述点播节目的内容、 所述保存的节目内容的末播放位置信息；
第二发送单元，用于当所述第二查找单元查找到所述目标点播节目的标识 及所述标识对应的末播放位置信息后向， 向 VOD服务器发送包括所述点播节 目标识及末播放位置信息的播放请求信息。
13、 如权利要求 12所述的数字电视设备， 其特征在于， 还包括： 播放单元，用于播放预先保存的与所述点播节目标识对应的预设长度的点 播节目内容，在播放完所述预先保存的点播节目内容后从所述末播放位置起播 放所述目标点播节目。
14、 如权利要求 12或 13所述的数字电视设备， 其特征在于， 还包括： 提示单元， 用于通过选择界面提示用户是否保存所述信息及对应关系， 和 /或提示用户是否从所述末播放位置开始播放所述目标点播节目。
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