Abstract:
A channel content playback method based on a hybrid network system which may avoid idleness of a digital video broadcasting (DVB) network and a hybrid set top box that may implement the method. The method includes accessing, by the hybrid set top box, an electronic program guide (EPG) system, acquiring, from the EPG system, a channel list of channel content, receiving, based on channel selection performed by a user according to the channel list, target channel content through a DVB network channel, acquiring a first uniform resource locator (URL) from the EPG system according to a rewind operation of the user, and acquiring, according to the first URL, the rewound target channel content from a content delivery network (CDN) system located in an Internet Protocol (IP) network.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation of international application number PCT/CN2014/091842 filed on Nov. 21, 2014, which claims priority to Chinese patent application number 201410228808.5 filed on May 27, 2014, both of which are incorporated by reference. 
     
    
     TECHNICAL FIELD 
       [0002]    The present disclosure relates to the communications field, and in particular, to a hybrid network system, a channel content playback method, and a hybrid set top box (STB). 
       BACKGROUND 
       [0003]    A digital video broadcasting (DVB) service has been launched for many years, and related technologies thereof have been quite mature. A principle of the DVB service is that an operator sets up a DVB network, and provides a video live broadcast service for a user through the DVB network such that the user can watch at home live broadcast television programs around the world conveniently. However, with the development of science and technology and improvement of material living standard of human beings, a user has increasingly diversified requirements for video watching, and live broadcast television programs cannot meet a demand of the user any longer. In recent years, due to popularization of an Internet Protocol (IP) network and improvement of network bandwidth, a user can experience rich Internet services, which include a video service such as a web television. In addition, the user can conveniently perform operations on a video, such as pause, rewind, fast forward, and playback, which meets diversified requirements of the user when the user uses an Internet video service. Therefore, a conventional live broadcast service of a digital television is at a distinct disadvantage under the impact of the Internet. 
         [0004]    To improve this situation, operators attempt to introduce some functions of the Internet video service into the digital television. For example, an operator may set up, based on an IP network, a web television platform to introduce a live stream in a DVB network into the IP network by means of headend transcoding, thereby transforming the DVB network into an IP network, and providing a media service for the digital television using a content delivery network (CDN) in the IP network. In this way, the digital television may provide a video service of the IP network for a user, where the video service includes a service such as live broadcast, fast forward, rewind, or playback. 
         [0005]    However, at a present stage, operators of conventional broadcast and television deploy a large quantity of DVB networks, and a large quantity of DVB networks are idle if a DVB network is transformed into an IP network. Consequently, a serious waste of network resources is caused and transformation costs are high, which is hardly affordable for the operators of the conventional broadcast and television. 
       SUMMARY 
       [0006]    Embodiments of the present disclosure provide a hybrid network system, and provide, based on the hybrid network system, a corresponding channel content playback method and a corresponding hybrid STB. 
         [0007]    A first aspect of the embodiments of the present disclosure provides a hybrid network system, including a head end system configured to acquire channel content from a media source, perform encoding on the channel content, provide live broadcast of the channel content for a terminal through a DVB network, and send the channel content to a hybrid video system that is in an IP network. The hybrid video system configured to acquire the channel content from the head end system, perform editing on the channel content, generate a channel list of the channel content, and deliver the channel content to a CDN system. The CDN system is configured to acquire the channel content from the hybrid video system, allocate a uniform resource locator (URL) to the channel content, and report the URL to the hybrid video system, and further configured to provide on-demand broadcast of the channel content for a hybrid STB according to a request, sent by a user based on the URL, for performing rewinding or fast forwarding on the channel. An electronic program guide (EPG) system configured to acquire the channel list of the channel content and the URL of the channel content from the hybrid video system, and send the channel list and the URL of the channel content to the hybrid STB according to a request of the user, and the hybrid STB configured to acquire the channel list from the EPG system, and receive, based on a DVB network channel, the channel content from the head end system through a DVB interface according to channel selection performed by the user based on the channel list, and further configured to acquire the URL of the channel content from the EPG system, and acquire, based on an IP network, the channel content from the CDN through an IP interface according to the rewind or fast forward request, based on the URL, of the user. 
         [0008]    A second aspect of the embodiments of the present disclosure provides a channel content playback method, including accessing an EPG system, and acquiring, from the EPG system, a channel list of channel content, receiving, through a DVB network channel and based on channel selection performed by a user according to the channel list, target channel content selected by the user, acquiring a first URL from the EPG system according to a rewind operation of the user, where the first URL is a URL of a corresponding content fragment to which the target channel content has been rewound, and acquiring, according to the first URL, the rewound target channel content from a CDN system located in an IP network. 
         [0009]    Based on the second aspect of the embodiments of the present disclosure, in a first implementation manner of the second aspect of the embodiments of the present disclosure, the method further includes acquiring a second URL from the EPG system according to a fast forward operation of the user, where the second URL is a URL of a corresponding content fragment to which the target channel content has been fast forwarded, and acquiring, according to the second URL, the fast forwarded target channel content from the CDN system located in the IP network. 
         [0010]    With reference to the first implementation manner of the second aspect of the embodiments of the present disclosure, in a second implementation manner of the second aspect of the embodiments of the present disclosure, the method further includes receiving the target channel content through the DVB network channel when a moment to which the target channel content has been fast forwarded reaches a live broadcast moment of the target channel content. 
         [0011]    A third aspect of the embodiments of the present disclosure provides a hybrid STB, including an EPG interface configured to access an EPG system, and acquire, from the EPG system, a channel list of channel content, a DVB interface configured to receive, through a DVB network channel and based on channel selection performed by a user according to the channel list, target channel content selected by the user, where the EPG interface is further configured to acquire a first URL from the EPG system according to a rewind operation of the user, where the first URL is a URL of a corresponding content fragment to which the target channel content has been rewound, and an IP interface configured to acquire, according to the first URL, the rewound target channel content from a CDN system located in an IP network. 
         [0012]    With reference to the third aspect of the embodiments of the present disclosure, in a first implementation manner of the third aspect of the embodiments of the present disclosure, the EPG interface is further configured to acquire a second URL from the EPG system according to a fast forward operation of the user, where the second URL is a URL of the corresponding content fragment to which the target channel content has been rewound, and the IP interface is further configured to acquire, according to the second URL, the fast forwarded target channel content from the CDN system located in the IP network. 
         [0013]    With reference to the first implementation manner of the third aspect of the embodiments of the present disclosure, in a second implementation manner of the third aspect of the embodiments of the present disclosure, the DVB interface is further configured to receive the target channel content through the DVB network channel when a moment to which the target channel content has been fast forwarded reaches a live broadcast moment of the target channel content. 
         [0014]    It can be seen from the foregoing technical solutions that, according to the embodiments of the present disclosure, a prior-art method for providing a video live broadcast service through a DVB network is improved, where an IP network is used based on the DVB network. A hybrid STB of a user supports both a DVB network and an IP network. Channel content for live broadcast may be acquired from a head end system through a DVB interface, and the fast forwarded or rewound channel content may also be acquired, based on the IP network, from a CDN through an IP interface. Using such method, the method provided in the present disclosure can implement live broadcast of the channel content through the DVB network, and can also implement a rewind operation through the IP network. Because in the embodiments of the present disclosure, improvement is made based on an existing DVB network, and the DVB network is used to provide a live broadcast service of channel content for a user, idleness of the DVB network is not caused such that an operator may use the DVB network to provide a live broadcast service for the user, and use an IP network to provide a service based on the IP network for the user. Therefore, network resources are saved, transformation costs are reduced, and requirements of the operator are met. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0015]      FIG. 1  is a structural diagram of an embodiment of a hybrid network system in an embodiment of the present disclosure; 
           [0016]      FIG. 2  is a flowchart of an embodiment of a channel content playback method in an embodiment of the present disclosure; 
           [0017]      FIG. 3  is a flowchart of another embodiment of a channel content playback method in an embodiment of the present disclosure; and 
           [0018]      FIG. 4  is a structural diagram of an embodiment of a hybrid STB in an embodiment of the present disclosure. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0019]    Embodiments of the present disclosure provide a hybrid network system, and provide, based on the hybrid network system, a corresponding channel content playback method and a corresponding hybrid STB, which are respectively described in the following. 
         [0020]    For a basic structure of a hybrid network system provided in an embodiment of the present disclosure, refer to  FIG. 1 . The hybrid network system mainly includes a head end system  101  configured to acquire channel content from a media source, perform encoding on the channel content, provide live broadcast of the channel content for a terminal through a DVB network, and send the channel content to a hybrid video system  102  that is in an IP network. The hybrid video system  102  configured to acquire the channel content from the head end system  101 , perform editing on the channel content, generate a channel list of the channel content, and deliver the channel content to a CDN system  103 . The CDN system  103  configured to acquire the channel content from the hybrid video system  102 , allocate a URL to the channel content, and report the URL to the hybrid video system  102 , and further configured to provide on-demand broadcast of the channel content for a hybrid STB  105  according to a request, sent by a user based on the URL, for performing rewinding or fast forwarding on the channel, an EPG system  104  configured to acquire the channel list of the channel content and the URL of the channel content from the hybrid video system  102 , and send the channel list and the URL of the channel content to the hybrid STB  105  according to a request of the user, and the hybrid STB  105  configured to acquire the channel list from the EPG system  104 , and receive, based on a DVB network channel, the channel content from the head end system  101  through a DVB interface according to channel selection performed by the user based on the channel list, and further configured to acquire the URL of the channel content from the EPG system  104 , and acquire, based on an IP network, the channel content from the CDN system  103  through an IP interface according to the rewind or fast forward request, based on the URL, of the user. 
         [0021]    The hybrid network system provided in this embodiment implements a combination of a DVB network and an IP network. Based on an existing DVB network, the head end system  101  performs encoding on channel content, and sends the encoded channel content to the hybrid video system  102  that is in the IP network. The CDN system  103  in the IP network acquires, from the hybrid video system  102 , the encoded channel content, allocates a URL to the encoded channel content, and reports the URL to the hybrid video system  102 . The encoded channel content is saved in the CDN system  103  in a form of a content fragment, and the URL is used to locate a location of each content fragment. 
         [0022]    The hybrid STB  105  acquires, through the DVB network and through the DVB interface, channel content for live broadcast when a user watches a live broadcast video. The EPG system  104  acquires, from the hybrid video system  102 , a URL of a corresponding content fragment to which the channel content has been rewound or fast forwarded when the user performs a rewind or fast forward operation, and the hybrid STB  105  acquires, from the EPG system  104 , the URL of the corresponding content fragment to which the channel content has been rewound or fast forwarded, and acquires corresponding channel content from the CDN system  103  according to the acquired URL. 
         [0023]    In an order that switching can be successfully performed from a DVB network to an IP network, or switching back to a DVB network can be successfully performed from an IP network, a channel list of channel content in the DVB network keeps the same as a channel list of channel content in the IP network. 
         [0024]    The DVB network includes a DVB-satellite (DVB-S) network, a DVB-terrestrial (DVB-T) network, or a DVB-cable (DVB-C) network, which is not limited in this embodiment. The IP network includes an IP dedicated network or an IP public network, which is not limited in this embodiment. 
         [0025]    An operator may directly deploy an origin server without deploying an entire CDN system  103 . The origin server is configured to complete a media distribution capability of the CDN system  103  by means of a caching mechanism of the Hypertext Transfer Protocol (HTTP). 
         [0026]    This embodiment of the present disclosure provides a hybrid network system, including the head end system  101 , the hybrid video system  102 , the CDN system  103 , the EPG system  104 , and the hybrid STB  105 . The head end system  101  performs encoding on channel content provided by a DVB network for live broadcast, and sends encoded channel content to the hybrid video system  102  such that the DVB network is used in combination with an IP network. The hybrid STB  105  acquires, through a DVB interface, the channel content for live broadcast from the head end system  101 , and acquires, based on the IP network, the fast forwarded or rewound channel content from the CDN through an IP interface. Using such method, the method provided in the present disclosure can implement live broadcast of the channel content through the DVB network, and can also implement a rewind operation through the IP network. Because in this embodiment of the present disclosure, improvement is made based on an existing DVB network, and the DVB network is used to provide a live broadcast service of channel content for a user, idleness of the DVB network is not caused such that an operator may use the DVB network to provide a live broadcast service for the user, and use an IP network to provide a service based on the IP network for the user. Therefore, network resources are saved, transformation costs are reduced, and requirements of the operator are met. 
         [0027]    Based on the hybrid network system shown in  FIG. 1 , an embodiment of the present disclosure further provides a channel content playback method. For a basic process of the method, refer to  FIG. 2 , and the method includes the following steps. 
         [0028]    Step  201 : Access an EPG system, and acquire, from the EPG system, a channel list of channel content. 
         [0029]    The EPG system may provide presentation of the channel list. In this embodiment, a hybrid STB accesses the EPG system after being started, and acquires, from the EPG system, the channel list of the channel content. 
         [0030]    Step  202 : Receive, based on channel selection performed by a user according to the channel list, target channel content through a DVB network channel. 
         [0031]    After an EPG system presents the channel list to the user, the user selects, according to the channel list, channel content that the user expects to watch. The hybrid STB receives, based on the channel selection performed by the user according to the channel list, the target channel content through the DVB network channel, where the target channel content is the channel content selected by the user. 
         [0032]    It can be understood that in this step, the target channel content received by the hybrid STB through a DVB network is live broadcast of the target channel content. 
         [0033]    Step  203 : Acquire a first URL from the EPG system according to a rewind operation of the user. 
         [0034]    The hybrid STB acquires, through the DVB network channel, channel content for live broadcast, where a current playing time point of the channel content acquired by the hybrid STB through the DVB network channel is a live broadcast moment. A rewind operation may be performed if the user needs to watch channel content that is on the target channel and whose moment is earlier than the live broadcast moment. In this case, the target channel content received by the hybrid STB through the DVB network cannot meet a rewind requirement of the user such that the hybrid STB is switched from the DVB network to an IP network to respond to the rewind operation of the user. 
         [0035]    To acquire, through the IP network, the rewound target channel content, the hybrid STB first needs to locate a content fragment to which the target channel content has been rewound and that is saved in a CDN. The hybrid STB acquires, from the EPG system, the first URL, that is, a URL of the corresponding content fragment to which the target channel content has been rewound. 
         [0036]    Further, after the user performs the rewind operation, the hybrid STB sends a rewind request to the EPG system according to a target channel time point to which the user rewinds, and the EPG system determines, according to the target channel time point to which the user needs to rewind, an identifier of a content fragment, which corresponds to the time point, of target channel content, and determines, according to the identifier of the content fragment, a URL of the content fragment. 
         [0037]    The EPG system may acquire the first URL from a hybrid video system. 
         [0038]    Step  204 : Acquire, according to the first URL, the rewound target channel content from a CDN system located in an IP network. 
         [0039]    After acquiring the first URL, the hybrid STB may locate the rewound target channel content. The hybrid STB acquires, according to the first URL, the rewound target channel content from the CDN system located in the IP network. 
         [0040]    This embodiment provides, based on the hybrid network system shown in  FIG. 1 , a channel content playback method, where a hybrid STB accesses an EPG system, and acquires, from the EPG system, a channel list of channel content, receives, based on channel selection performed by a user according to the channel list, target channel content through a DVB network channel, acquires a first URL from the EPG system according to a rewind operation of the user, and acquires, according to the first URL, the rewound target channel content from a CDN system located in an IP network. Using such method, the hybrid STB provided in this embodiment of the present disclosure implements receiving, through the DVB network channel, target channel content for live broadcast, and acquiring the rewound target channel content from the CDN system located in the IP network. Because in this embodiment of the present disclosure, improvement is made based on an existing DVB network, and the DVB network is used to provide a live broadcast service of channel content for a user, idleness of the DVB network is not caused such that an operator may use the DVB network to provide a live broadcast service for the user, and use an IP network to provide a service based on the IP network for the user. Therefore, network resources are saved, transformation costs are reduced, and requirements of the operator are met. 
         [0041]    The embodiment shown in  FIG. 2  provides a channel content playback method such that it is implemented that a hybrid STB receives, through a DVB network channel, target channel content for live broadcast, and acquires the rewound target channel content from a CDN system located in an IP network. The following embodiment provides, based on the hybrid network system shown in  FIG. 1 , another channel content playback method, which can implement acquisition of rewound target channel content, and can also implement acquisition of fast forwarded channel content. Referring to  FIG. 3 , a basic process of another embodiment according to the present disclosure includes the following steps. 
         [0042]    Step  301 : Access an EPG system, and acquire, from the EPG system, a channel list of channel content. 
         [0043]    Step  302 : Receive, based on channel selection performed by a user according to the channel list, target channel content through a DVB network channel. 
         [0044]    Step  303 : Acquire a first URL from the EPG system according to a rewind operation of the user. 
         [0045]    Step  304 : Acquire, according to the first URL, the rewound target channel content from a CDN system located in an IP network. 
         [0046]    Step  301  to step  304  are same as step  201  to step  204 , and details are not described herein again. 
         [0047]    Step  305 : Acquire a second URL from the EPG system according to a fast forward operation of the user. 
         [0048]    If the user performs a fast forward operation after performing the rewind operation, to respond to the fast forward operation of the user, a hybrid STB first needs to locate a content fragment to which the target channel content has been fast forwarded and that is saved in a CDN. The hybrid STB acquires, from the EPG system, the second URL, that is, a URL of the corresponding content fragment to which the target channel content has been fast forwarded. 
         [0049]    A method and a process for acquiring the second URL are consistent with a method and a process for acquiring the first URL. 
         [0050]    The EPG system may acquire the second URL from a hybrid video system. 
         [0051]    Step  306 : Acquire, according to the second URL, the fast forwarded target channel content from the CDN system located in the IP network. 
         [0052]    After acquiring the second URL, the hybrid STB may locate the fast forwarded target channel content. The hybrid STB acquires, according to the second URL, the fast forwarded target channel content from the CDN system located in the IP network. 
         [0053]    It can be understood that the hybrid STB cannot be switched, in a case in which live broadcast of the target channel content is performed through the DVB network channel, to the IP network to respond to the fast forward operation of the user, and the hybrid STB can respond to the fast forward operation of the user only when the hybrid STB has been switched to the IP network and the rewind operation is performed. 
         [0054]    This embodiment provides, based on the hybrid network system shown in  FIG. 1 , a channel content playback method, where a hybrid STB accesses an EPG system, and acquires, from the EPG system, a channel list of channel content, receives, based on channel selection performed by a user according to the channel list, target channel content through a DVB network channel, acquires a first URL from the EPG system according to a rewind operation of the user, acquires, according to the first URL, the rewound target channel content from a CDN system located in an IP network, acquires a second URL from the EPG system according to a fast forward operation of the user, and acquires, according to the second URL, the fast forwarded target channel content from the CDN system located in the IP network. Using such method, the hybrid STB provided in this embodiment of the present disclosure implements receiving, through the DVB network channel, target channel content for live broadcast, and acquiring the rewound or fast forwarded target channel content from the CDN system located in the IP network. Because in this embodiment of the present disclosure, improvement is made based on an existing DVB network, and the DVB network is used to provide a live broadcast service of channel content for a user, idleness of the DVB network is not caused such that an operator may use the DVB network to provide a live broadcast service for the user, and use an IP network to provide a service based on the IP network for the user. Therefore, network resources are saved, transformation costs are reduced, and requirements of the operator are met. 
         [0055]    It can be understood that when the user performs the fast forward operation, a moment of the content fragment that is acquired by the hybrid STB from the CDN system and to which the target channel content has been fast forwarded is not later than that of a channel live broadcast moment of the target channel content. The hybrid STB switches from receiving the target channel content through a DVB network channel to receiving the target channel content through an IP network, that is, switches from fast forwarding of the target channel content to live broadcast of the target channel content when the moment to which the target channel content has been fast forwarded reaches the live broadcast moment of the target channel content. 
         [0056]    The IP network includes an IP public network or an IP dedicated network. Preferably, if the IP network is an IP public network, when receiving, through the IP public network, the fast forwarded target channel content, the hybrid STB may acquire an index file of the content fragment corresponding to the target channel content such that the hybrid STB can determine whether the moment to which the target channel content has been fast forwarded reaches the live broadcast moment of the target channel content, and the CDN system determines whether the moment to which the target channel content has been fast forwarded reaches the live broadcast moment of the target channel content, and notifies the hybrid STB of a result of the determining if the IP network is an IP dedicated network. 
         [0057]    For better understanding of the foregoing embodiment, the following provides description using a specific application scenario of the foregoing embodiment as an example. 
         [0058]    A user intends to watch a television to watch NBA FINALS to be live broadcast on closed-circuit television (CCTV)-5 channel, so the user starts a hybrid STB, and the hybrid STB accesses an EPG system, acquires, from the EPG system, a channel list of channel content, and presents the channel list to the user. 
         [0059]    The user selects the CCTV-5 channel according to the channel list, and the hybrid STB receives, through a DVB network, NBA FINALS that are being live broadcast on the CCTV-5 channel, and provides the received content for the user. 
         [0060]    The user expects to review previous content of the game, so the user performs a rewind operation, that is, performs rewinding by 60 seconds (s) when advertising time begins after the first two quarters of the game end. 
         [0061]    The hybrid STB receives the operation that is performed by the user for rewinding by 60 s, acquires, from the EPG system, a URL of a corresponding content fragment to which CCTV-5 channel content has been rewound by 60 s, and acquires, according to the URL and from a CDN system located in an IP network, the CCTV-5 channel content to which rewinding is performed by 60 s, and provides the content for the user. 
         [0062]    After the user watches video content that the user expects to review, the user expects to enter live broadcast to wait for the third quarter of the game to start, so the user performs a fast forward operation, that is, performs fast forwarding by 50 s. 
         [0063]    The hybrid STB receives the operation that is performed by the user for fast forwarding by 50 s, acquires, from the EPG system, a URL of a corresponding content fragment obtained when the CCTV-5 channel content has been rewound by 60 s and fast forwarded by 50 s, and acquires, according to the URL, the corresponding CCTV-5 channel content from the CDN system located in the IP network, and provides the content for the user. 
         [0064]    The user finds that a moment of watched channel content is still earlier than a live broadcast moment of the channel content, so the user continues to perform a fast forward operation, that is, perform fast forwarding by 20 s. 
         [0065]    Because the user performs an operation of rewinding by 60 s and an operation of fast forwarding by 50 s, a moment of the CCTV-5 channel content provided by the hybrid STB for the user is only 10 s earlier than the live broadcast moment of the channel content. Therefore, when the user performs fast forwarding by 20 s, the hybrid STB determines that a moment to which the CCTV-5 channel content has been fast forwarded has reached the live broadcast moment of the CCTV-5 channel, so the hybrid STB acquires the CCTV-5 channel content through the DVB network, and provides live broadcast of the CCTV-5 channel content for the user. 
         [0066]    An embodiment of the present disclosure further provides a hybrid STB supporting the foregoing hybrid network system and channel content playback method, for a basic structure of the hybrid STB, refer to  FIG. 4 . The hybrid STB mainly includes an EPG interface  401  configured to access an EPG system, and acquire, from the EPG system, a channel list of channel content, a DVB interface  402  configured to receive, based on channel selection performed by a user according to the channel list, target channel content through a DVB network channel, where the target channel content is channel content selected by the user, where the EPG interface  401  is further configured to acquire a first URL from the EPG system according to a rewind operation of the user, where the first URL is a URL of a corresponding content fragment to which the target channel content has been rewound, and an IP interface  403  configured to acquire, according to the first URL, the rewound target channel content from a CDN system located in an IP network. 
         [0067]    The hybrid STB provided in this embodiment can implement the channel content playback method provided in the embodiments of the present disclosure. After being started, the EPG interface  401  of the hybrid STB accesses the EPG system, and acquires, from the EPG system, the channel list of the channel content. Then the hybrid STB acquires, through the DVB interface  402  and based on the channel selection performed by the user according to the channel list, channel content for live broadcast from a DVB network, and the EPG interface  401  of the hybrid STB acquires, from the EPG system, the first URL of a corresponding content fragment to which the channel content has been rewound when the user performs a rewind operation, and the IP interface  403  of the hybrid STB acquires, according to the acquired first URL, corresponding channel content from the CDN system. 
         [0068]    The hybrid STB provided in this embodiment supports both a DVB network and an IP network. Channel content for live broadcast may be acquired through a DVB interface  402 , and the fast forwarded or rewound channel content may also be acquired, based on the IP network, from a CDN through an IP interface  403 . Live broadcast of the channel content can be performed through the DVB network, and a rewind operation can also be performed through the IP network. Because the hybrid STB in this embodiment uses a DVB network to provide a live broadcast service of channel content for a user, idleness of the DVB network is not caused such that an operator may use the DVB network to provide a live broadcast service for the user, and use an IP network to provide a service based on the IP network for the user. Therefore, network resources are saved, transformation costs are reduced, and requirements of the operator are met. 
         [0069]    Preferably, to support a fast forward operation of the user, the EPG interface  401  is further configured to acquire a second URL from the EPG system according to the fast forward operation of the user, where the second URL is a URL of a corresponding content fragment to which the target channel content has been rewound, and the IP interface  403  is further configured to acquire, according to the second URL, the fast forwarded target channel content from the CDN system located in the IP network. 
         [0070]    Preferably, the DVB interface  402  is further configured to receive the target channel content through the DVB network channel when a moment to which the target channel content has been fast forwarded reaches a live broadcast moment of the target channel content. 
         [0071]    For better understanding of the foregoing embodiment, the following provides description using a specific application scenario of the foregoing embodiment as an example. 
         [0072]    A user intends to watch a television to watch NBA FINALS to be live broadcast on CCTV-5, so the user starts a hybrid STB, and the hybrid STB accesses an EPG system through the EPG interface  401 , acquires, from the EPG system, a channel list of channel content, and presents the channel list to the user. 
         [0073]    The user selects a CCTV-5 channel according to the channel list, and the hybrid STB receives, through the DVB interface  402  and through a DVB network, NBA FINALS that are being live broadcast on the CCTV-5 channel, and provides the received content for the user. 
         [0074]    The user expects to review previous content of the game when advertising time begins after the first two quarters of the game end, so the user performs a rewind operation, that is, performs rewinding by 60 s. 
         [0075]    The hybrid STB receives the operation that is performed by the user for rewinding by 60 s, acquires, from the EPG system, a URL of a corresponding content fragment to which CCTV-5 channel content has been rewound by 60 s, and acquires, through the IP interface  403  according to the URL and from a CDN system located in an IP network, the CCTV-5 channel content to which rewinding is performed by 60 s, and provides the content for the user. 
         [0076]    After the user watches video content that the user expects to review, the user expects to enter live broadcast to wait for the third quarter of the game to start, so the user performs a fast forward operation, that is, performs fast forwarding by 50 s. 
         [0077]    The hybrid STB receives the operation that is performed by the user for fast forwarding by 50 s, acquires, from the EPG system, a URL of a corresponding content fragment obtained when the CCTV-5 channel content has been rewound by 60 s and fast forwarded by 50 s, and acquires, through the IP interface  403  according to the URL, the corresponding CCTV-5 channel content from the CDN system located in the IP network, and provides the content for the user. 
         [0078]    The user finds that a moment of watched channel content is still earlier than a live broadcast moment of the channel content, so the user continues to perform a fast forward operation, that is, perform fast forwarding by 20 s. 
         [0079]    Because the user performs an operation of rewinding by 60 s and an operation of fast forwarding by 50 s, a moment of the CCTV-5 channel content provided by the hybrid STB for the user is only 10 s earlier than the live broadcast moment of the channel content. Therefore, the hybrid STB determines that a moment to which the CCTV-5 channel content has been fast forwarded has reached the live broadcast moment of the CCTV-5 channel when the user performs fast forwarding by 20 s, so the hybrid STB acquires the CCTV-5 channel content through the DVB interface  402  and through the DVB network, and provides live broadcast of the CCTV-5 channel content for the user. 
         [0080]    It may be clearly understood by persons skilled in the art that, for the purpose of convenient and brief description, for a detailed working process of the foregoing system, apparatus, and unit, reference may be made to a corresponding process in the foregoing method embodiments, and details are not described herein again. 
         [0081]    In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the described apparatus embodiment is merely exemplary. For example, the unit division is merely logical function division and may be other division in actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented using some interfaces. The indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms. 
         [0082]    The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments. 
         [0083]    In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in a form of hardware, or may be implemented in a form of a software functional unit. 
         [0084]    When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the present disclosure essentially, or the part contributing to the prior art, or all or some of the technical solutions may be implemented in the form of a software product. The software product is stored in a storage medium and includes several instructions for instructing a computer device (which may be a personal computer, a server, a network device, or the like) to perform all or some of the steps of the methods described in the embodiments of the present disclosure. The foregoing storage medium includes any medium that can store program code, such as a universal serial bus (USB) flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc. 
         [0085]    The foregoing embodiments are merely intended for describing the technical solutions of the present disclosure, but not for limiting the present disclosure. Although the present disclosure is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features thereof, without departing from the spirit and scope of the technical solutions of the embodiments of the present disclosure.