CN102572551B - Source server, next generation on demand (NGOD)-based time-shifted program on demand method and system - Google Patents
Source server, next generation on demand (NGOD)-based time-shifted program on demand method and system Download PDFInfo
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Abstract
The invention provides a next generation on demand (NGOD)-based time-shifted program on demand method, which comprises the following steps of: a source server (SS) transmits a current program play list to a digital television receiving terminal through an Internet protocol quadrature amplitude modulator (IPQAM) according to a frequency point of a current program play list allocated by a session manager (SM); the SS determines that the current program play list is played to the head or to the end, acquires the next program play list from a navigation server (NS) through the SM, and adds the next program play list; and the SS transmits the next program play list to the digital television receiving terminal through the IPQAM according to the frequency point of the current program play list. The invention also provides an NGOD-based time-shifted program on demand system and the SS. By the method, the system and the SS, the frequent frequency locking of the digital television receiving terminal is not required, and the stability of time-shifted program on demand is improved.
Description
Technical field
The present invention relates to Digital TV Receiving technology, particularly a kind of video server, time shift program order method and system based on VOD system of future generation (Next Generation on Demand, NGOD).
Background technology
Fig. 1 is the flow chart of the existing time shift program order method based on NGOD, now in conjunction with Fig. 1, the existing time shift program order method based on NGOD is described, specific as follows:
Step 101:STB sends time shift and handovers request to PORTAL;
Set Top Box (Set Top Box, STB) as receiving terminal for digital television can be used as program request client (On Demand Client, ODC), the program request in order to completing user to time shift program.
Particularly, in STB, preserve electric program menu (Electronic Program Guide, EPG), in EPG, comprise time shift program and the programme televised live that can order; User controls STB and is switched to time shift program program request state by live state, and STB sends time shift and handovers request to digital television gateway system (PORTAL).
Wherein, the time shift program that can order in EPG refers in video server (Source Server, SS) or content distributing network (Content Delivery Network, CDN) and has completed the program that time shift program request can be provided of recording; It is that STB exports to the time shift page that display device comprises the time shift program that can order that STB is switched to time shift program program request state by live state, so that user carries out time shift program program request; In time shift handover request, at least comprise the request time of channel information, user profile and time shift.
Step 102:PORTAL sends to obtain and orders token request to NS;
In this step, PORTAL transmission is carried the obtaining of request time of channel information, user profile and time shift and is ordered token request to navigation server (Navigation Server, NS).Wherein, ordering token is the unique identification of the time shift program of program request; The request time of time shift is the time that STB initiates time shifting request, and this time is an absolute time, i.e. the actual time.
Step 103:NS sends and orders token response to PORTAL;
In this step, NS is according to the request time of ordering token request, channel information, user profile and time shift that obtains receiving, generate and order token and order the corresponding relation between token and the request time of channel information, user profile and time shift, preserve the corresponding relation of ordering between token and the request time of channel information, user profile and time shift.
Step 104:PORTAL returns and orders token to STB;
In this step, PORTAL, according to the order token receiving, generates a RTSP according to real time streaming transport protocol (Real Time Streaming Protocol, RTSP) and goes here and there to STB; Wherein, in RTSP string, carried the instruction that can carry out time shift program program request.
Step 105:STB sends time shifting broadcasting request to SM;
In this step, STB sends and carries the time shifting broadcasting request of ordering token to session manager (Session Manager, SM).
Step 106:SM sends and obtains program playlist request to NS;
In this step, SM send carry order token obtain program playlist request to NS.
Step 107:NS returns to program playlist to SM;
In this step, NS carries out authentication according to obtaining the order token that program playlist request carries, by after authentication, obtain and order token and there is the channel information of corresponding relation and the corresponding program playlist of the request time of time shift, return to program playlist to SM.Wherein, in program playlist, at least comprise the initial time of channel information, time shift program and the termination time of time shift program.
Step 108:SM distributes frequency;
In this step, SM is according to the resource load of edge modulator (IPQAM), for STB distributes frequency.
Step 109:SM sends program playlist request to SS;
In this step, SM sends the program playlist request of carrying program playlist to SS.Wherein, in program playlist request, carry IPQAM stream receiver address and port numbers, so that follow-up SS carries out plug-flow to STB.
Step 110:SS sends program playlist and responds to SM;
In this step, SS is according to the program playlist receiving, by determining that with the mutual of CDN CDN has recorded the program resource corresponding with program playlist, or definite its recorded the program resource corresponding with program playlist according to the performance recording plan having received, send the response of program playlist and address information thereof to SM.
Wherein, in the response of program playlist, at least comprise the session identification that program playlist is corresponding.
Step 111:SM returns to time shifting broadcasting and responds to STB;
In this step, SM, according to the program number of program playlist response generation time shift program, sends time shifting broadcasting and responds to STB.Wherein, in time shifting broadcasting response, at least carry session identification that frequency point information, the program number of time shift program, the program playlist of IPQAM is corresponding and the address information of SS.
Step 112:STB frequency locking;
In this step, STB carries out frequency locking according to the frequency point information of IPQAM, prepares to receive plug-flow.
Step 113:STB sends playing request to SS;
In this step, STB, according to the address information of SS, sends the playing request of carrying the session identification that program playlist is corresponding to SS.
Step 114:SS carries out plug-flow to STB;
In this step, IPQAM stream receiver address and port numbers that SS sends according to session identification corresponding to the time program playlist receiving and SM, carry out plug-flow by IPQAM to STB.
Step 115:SS judges the broadcasting of program playlist to the end or arrives tail;
In this step, SS, according to program playlist, judges whether it plays to the end or to tail, if so, perform step 116, otherwise, continue to carry out plug-flow by IPQAM to STB.
Step 116:SS sends broadcasting to the end or should be to STB to hangover;
In this step, SS sends a response message to STB, in order to point out the time shift program of program request to play to the end or arrive tail.
Step 117:STB sends and stops session request to SM;
In this step, in the termination session request that STB sends, at least comprise the session identification corresponding to program playlist of this program request.
Step 118:SM sends and stops session request to SS;
In this step, SM is carried at session identification corresponding program playlist to stop, in session request, sending to SS, in order to point out SS to finish this session.
Step 119:SS sends and stops conversational response to SM;
Step 120:SM sends and stops conversational response to STB;
Step 121:STB starts execution step 101;
In this step, STB does not switch to live state from the program request state of time shift program, still keeps the operating state of time shift program program request, starts execution step 101.
In the existing time shift program order method based on NGOD, appending time shift program need to carry out after the program request that completes a time shift program, such as, in the time of step 121, append program request time shift program, STB and PORTAL, NS, between SM and SS, need repeating step 101 to the interaction flow shown in step 120, network traffics are increased, and in the time that SS stops again carrying out the interval time of plug-flow to STB to STB plug-flow and SS, can there is because STB does not obtain plug-flow of short duration no signal output state in the equipment of output display, and in said process, STB need to be that the frequency that each time shift program distributes carries out frequency locking according to SM, in the stability of time shift program program request, need further raising.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of time shift program order method based on NGOD, the method, without the frequent frequency locking of receiving terminal for digital television, has improved the stability of time shift program program request.
The object of the present invention is to provide a kind of time shift program VOD system based on NGOD, this system, without the frequent frequency locking of receiving terminal for digital television, has improved the stability of time shift program program request.
The object of the present invention is to provide a kind of video server, this video server, in the time shift program point sowing time that completes receiving terminal for digital television, without the frequent frequency locking of receiving terminal for digital television, has improved the stability of time shift program program request.
For achieving the above object, technical scheme of the present invention is specifically achieved in that
A time shift program order method based on NGOD, the method comprises:
Video server SS, according to the frequency of the current program playlist of session manager SM distribution, carries out the plug-flow of current program playlist to receiving terminal for digital television by edge modulator IPQAM;
Described SS judges that current program playlist has been play to the end or to tail, is obtained next program playlist and appended by described SM navigation server NS;
Described SS, according to the frequency of current program playlist, carries out the plug-flow of next program playlist to described receiving terminal for digital television by described IPQAM;
Described SS is obtained next program playlist and is appended by described SM navigation server NS and comprises:
Described SS sends and plays to the end or arrive extremely described SM of hangover;
Described SM sends and obtains next program playlist request to described NS;
Described NS returns to next program playlist to described SM;
Described SM sends and plays next program playlist request to described SS.
In said method, described obtain next program playlist and append by described SM navigation server NS comprise:
A1, described SS send and play to the end or arrive extremely described SM of hangover;
Described broadcasting to the end or to hangover should at least carry end mark and the current session identification corresponding to program playlist of current program playlist;
A2, described SM are according to end mark and the order token corresponding with current program playlist of current program playlist, ask the next program playlist of current program playlist to described NS, according to next program playlist, send playing request to described SS;
In described playing request, at least comprise the frequency that current program playlist is corresponding, current corresponding session identification and the next program playlist of program playlist.
Preferably, the current program playlist of described judgement has been play to the end or had further been comprised before tail:
Receiving terminal for digital television sends the append request of carrying reproduction time to SS;
To be receiving terminal for digital television calculate the shift time obtaining according to the end time of the initial time of current program playlist and outside definite time shift to described reproduction time.
In said method, described obtain next program playlist and append by described SM navigation server NS comprise:
B1, described SS, according to the append request of carrying reproduction time from described receiving terminal for digital television, send and play to the end or arrive extremely described SM of hangover;
Described broadcasting to the end or to hangover should at least carry end mark and the current session identification corresponding to program playlist of current program playlist;
B2, described SM are according to end mark and the order token corresponding with current program playlist of current program playlist, ask the next program playlist of current program playlist to described NS, according to next program playlist, send playing request to described SS;
In described playing request, at least comprise the frequency that current program playlist is corresponding, current corresponding session identification and the next program playlist of program playlist;
B3, described SS, according to playing request, judge whether the absolute time of being determined by reproduction time exceeds the broadcasting scope of next program playlist, if so, and execution step B4, otherwise append next program playlist described in step B2;
Described absolute time is that the broadcasting initial time of current program playlist adds the time point that reproduction time obtains;
B4, described SS, using next program playlist described in step B2 as current program playlist, send and play to the end or should, to described SM, perform step B2 to hangover.
In said method, the described plug-flow that carries out next program playlist to receiving terminal for digital television by IPQAM comprises:
C1, described SS be according to session identification corresponding to current program playlist and playing request, keep and receiving terminal for digital television between session;
The frequency that C2, described SS are corresponding according to current program playlist, by described IPQAM, carries out the plug-flow of next program playlist to described receiving terminal for digital television.
A time shift program VOD system based on NGOD, this system comprises receiving terminal for digital television, digital television gateway system PORTAL, navigation server NS, session manager SM, video server SS and edge modulator IPQAM,
Described SS, according to the frequency of the current program playlist of SM distribution, carries out the plug-flow of current program playlist to receiving terminal for digital television by IPQAM;
Described SS judges that current program playlist has been play to the end or to tail, is obtained next program playlist and append to NS by described SM;
Described SS, according to the frequency of current program playlist, carries out the plug-flow of next program playlist to described receiving terminal for digital television by described IPQAM;
Described SS is obtained next program playlist and is appended by described SM navigation server NS and comprises:
Described SS sends and plays to the end or arrive extremely described SM of hangover;
Described SM sends and obtains next program playlist request to described NS;
Described NS returns to next program playlist to described SM;
Described SM sends and plays next program playlist request to described SS.
In said system, described SS comprises:
Plug-flow module, obtain the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to described SM, carry out the plug-flow of current program playlist to described receiving terminal for digital television by described IPQAM, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if so, end of output is indicated to control module, otherwise continues plug-flow;
Control module, current session identification corresponding to program playlist distributing write to the first memory module, according to finishing instruction, from the first memory module, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to described SM; The program playlist that described SM is sent, as the next program playlist appending, exports plug-flow module to;
The first memory module, in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
In said system, described SS comprises:
Plug-flow module, obtain the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to described SM, carry out the plug-flow of current program playlist to described receiving terminal for digital television by described IPQAM, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if so, end of output is indicated to control module, otherwise continues plug-flow;
Control module, current session identification corresponding to program playlist distributing write to the first memory module, according to finishing instruction or appending instruction, from the first memory module, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to described SM; The program playlist that described SM is sent exports locating module to;
Locating module, the append request of carrying reproduction time sending according to receiving terminal for digital television, utilize initial time and the reproduction time of the time shift program that current program playlist comprises, calculate and obtain absolute time, judge whether absolute time exceeds the broadcasting scope of the program playlist receiving, if so, send to append and indicate to control module, otherwise the program playlist that described SM is sent, as the next program playlist appending, exports plug-flow module to;
The first memory module, in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
In said system, described SM comprises:
List request module, the broadcasting sending according to SS is answered to the end or to hangover, asks the next program playlist of current program playlist to described NS; According to frequency corresponding to the current program playlist of next program playlist and acquisition, current session identification corresponding to program playlist, send playing request to described SS;
Session control module, the broadcasting sending according to SS is answered to the end or to hangover, and session identification corresponding temporary current program playlist and current frequency corresponding to program playlist are sent to list request module.
A kind of video server, comprising:
Plug-flow module, the frequency of the current program playlist distributing according to session manager SM, carry out the plug-flow of current program playlist to receiving terminal for digital television by edge modulator IPQAM, according to the frequency of current program playlist, carry out the plug-flow of next program playlist to described receiving terminal for digital television by described IPQAM;
Control module, judges that current program playlist has been play to the end or to tail, is obtained next program playlist and appended by described SM navigation server NS;
Video server SS is obtained next program playlist and is appended by described SM navigation server NS and comprises:
Described SS sends and plays to the end or arrive extremely described SM of hangover;
Described SM sends and obtains next program playlist request to described NS;
Described NS returns to next program playlist to described SM;
Described SM sends and plays next program playlist request to described SS.
In above-mentioned video server, this video server also comprises the first memory module:
Described plug-flow module, also for obtaining the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to described SM, carry out the plug-flow of current program playlist to described receiving terminal for digital television by described IPQAM, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if so, end of output is indicated to control module, otherwise continues plug-flow;
Described control module, also for current session identification corresponding to program playlist distributing write to the first memory module, according to finishing instruction, from the first memory module, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to described SM; The program playlist that described SM is sent, as the next program playlist appending, exports plug-flow module to;
Described the first memory module, in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
In above-mentioned video server, this video server also comprises locating module and the first memory module:
Described plug-flow module, also for obtaining the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to described SM, carry out the plug-flow of current program playlist to described receiving terminal for digital television by described IPQAM, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if so, end of output is indicated to control module, otherwise continues plug-flow;
Described control module, also for current session identification corresponding to program playlist distributing write to the first memory module, according to finishing instruction or appending instruction, from the first memory module, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to described SM; The program playlist that described SM is sent exports locating module to;
Described locating module, the append request of carrying reproduction time sending according to receiving terminal for digital television, utilize initial time and the reproduction time of the time shift program that current program playlist comprises, calculate and obtain absolute time, judge whether absolute time exceeds the broadcasting scope of the program playlist receiving, if so, send to append and indicate to control module, otherwise the program playlist that described SM is sent, as the next program playlist appending, exports plug-flow module to;
Described the first memory module, in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
As seen from the above technical solutions, the invention provides a kind of video server, time shift program VOD system and method based on NGOD, SS, according to the frequency of the current program playlist of SM distribution, carries out the plug-flow of current program playlist to receiving terminal for digital television by IPQAM; SS judges that current program playlist has been play to the end or to tail, is obtained next program playlist and append to NS by SM; SS, according to the frequency of current program playlist, directly carries out the plug-flow of next program playlist to receiving terminal for digital television by IPQAM.Adopt video server of the present invention, system and method, without the frequent frequency locking of receiving terminal for digital television, improved the stability of time shift program program request.
Brief description of the drawings
Fig. 1 is the flow chart of the existing time shift program order method based on NGOD;
Fig. 2 is the flow chart that the present invention is based on the time shift program order method of NGOD;
Fig. 3 is the flow chart that the present invention is based on the time shift program order method embodiment mono-of NGOD;
Fig. 4 is the flow chart that the present invention is based on the time shift program order method embodiment bis-of NGOD;
Fig. 5 is the structural representation that the present invention is based on the time shift program VOD system embodiment mono-of NGOD;
Fig. 6 is the structural representation that the present invention is based on the time shift program VOD system embodiment bis-of NGOD.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Fig. 2 is the flow chart that the present invention is based on the time shift program order method of NGOD.Now, in conjunction with Fig. 2, the time shift program order method that the present invention is based on NGOD is described, specific as follows:
Step 20:SS, according to the frequency of the current program playlist of SM distribution, carries out the plug-flow of current program playlist to receiving terminal for digital television by IPQAM;
Step 21:SS judges that current program playlist has been play to the end or to tail, is obtained next program playlist and append to NS by SM;
Step 22:SS, according to the frequency of current program playlist, carries out the plug-flow of next program playlist to receiving terminal for digital television by IPQAM.
The present invention take Set Top Box as example as digital TV terminal, to the present invention is based on the time shift program order method of NGOD and two embodiment of system are elaborated, certainly, the present invention also can be applicable to other digital TV terminals, for example: IPTV, digital TV integrated machine etc.
Fig. 3 is the flow chart that the present invention is based on the time shift program order method embodiment mono-of NGOD.Now, in conjunction with Fig. 3, the time shift program order method that the present invention is based on NGOD of embodiment mono-is described, specific as follows:
Step 301:STB sends time shift and handovers request to PORTAL;
STB is as program request client, the program request of completing user to time shift program.
In this step, STB, according to the instruction of outside input, is switched to time shift program program request state by live state, exports the time shift page of the time shift program of ordering comprising in EPG by display device, sends time shift and handovers request to PORTAL.
Wherein, in time shift handover request, at least comprise the request time of channel information, user profile and time shift.
Step 302:PORTAL sends to obtain and orders token request to NS;
In this step, PORTAL transmission is carried the obtaining of request time of channel information, user profile and time shift and is ordered token request to NS.
Wherein, ordering token is the unique identification of the time shift program of program request; The request time of time shift is the time that STB initiates time shifting request, and this time is an absolute time, i.e. the actual time.
Step 303:NS sends and orders token response to PORTAL;
In this step, NS is according to the request time of ordering token request, channel information, user profile and time shift that obtains receiving, generate and order token and order the corresponding relation between token and the request time of channel information, user profile and time shift, preserve the corresponding relation of ordering between token and the request time of channel information, user profile and time shift.
Step 304:PORTAL returns and orders token to STB;
In this step, PORTAL, according to the order token receiving, generates a RTSP according to RTSP and goes here and there to STB; Wherein, in RTSP string, carried the instruction that can carry out time shift program program request.
Step 305:STB sends time shifting broadcasting request to SM;
In this step, STB sends and carries the time shifting broadcasting request of ordering token to SM.
Step 306:SM sends and obtains program playlist request to NS;
In this step, SM send carry order token obtain program playlist request to NS.
Step 307:NS returns to program playlist to SM;
In this step, NS carries out authentication according to obtaining the order token that program playlist request carries, by after authentication, obtain and order token and there is the channel information of corresponding relation and the corresponding program playlist of the request time of time shift, return to program playlist to SM.
Wherein, in program playlist, at least comprise the initial time of channel information, time shift program and the termination time of time shift program.
Step 308:SM distributes frequency;
In this step, SM is according to the resource load of IPQAM, for STB distributes frequency.
Step 309:SM sends program playlist request to SS;
In this step, SM sends the program playlist request of carrying program playlist to SS.Wherein, in program playlist request, carry IPQAM stream receiver address and port numbers, so that follow-up SS carries out plug-flow to STB.
Step 310:SS sends program playlist and responds to SM;
In this step, SS is according to the program playlist receiving, determine that SS has recorded the audio, video data corresponding with program playlist, or by determining that with the mutual of CDN CDN has recorded the audio, video data corresponding with program playlist, send the response of program playlist and address information thereof to SM.
Wherein, in the response of program playlist, at least comprise the session identification that program playlist is corresponding; SS can, according to the audio, video data of the performance recording plan program recording receiving, carry out time shift program program request with the STB that is provided as ODC.
Step 311:SM returns to time shifting broadcasting and responds to STB;
In this step, SM, according to the program number of program playlist response generation time shift program, sends time shifting broadcasting and responds to STB.
Wherein, in time shifting broadcasting response, at least carry session identification that frequency point information, the program number of time shift program, the program playlist of IPQAM is corresponding and the address information of SS.
Step 312:STB frequency locking;
In this step, STB carries out frequency locking according to the frequency point information of IPQAM, prepares to receive plug-flow.
Step 313:STB sends playing request to SS;
In this step, STB, according to the address information of SS, sends the playing request of carrying the session identification that program playlist is corresponding to SS.
Step 314:SS carries out plug-flow to STB;
In this step, SS is according to session identification corresponding to program playlist receiving, and utilizing SM is the frequency that current program playlist distributes, and carries out plug-flow by IPQAM to STB.
Step 315:SS judges the broadcasting of program playlist to the end or arrives tail;
In this step, SS is according to the end mark that starts mark and current program playlist of current program playlist, judges whether it plays to the end or to tail, if so, execution step 316, otherwise continuation is carried out plug-flow by IPQAM to STB.
Step 316:SS sends broadcasting to the end or should be to SM to hangover;
In this step, SS no longer sends one and plays to the end or answer to hangover to the method shown in Fig. 1 to STB, but the time shift program sending in order to point out program request to SM is play responding to SM to the end or to tail.
Wherein, play to the end or to the hangover ANNOUCE message that should be SS send to SM, play to the end or to hangover should at least carry current program playlist end identify and current session identification corresponding to program playlist; The end mark of current program playlist can be the information that represents current program playlist broadcasting to the end or arrive tail, so that NS can determine the next program playlist being adjacent according to this mark.
Step 317:SM sends and obtains next program playlist request to NS;
In this step, SM is by the end mark of current program playlist and order token, is carried at and obtains in next playlist request, is sent to NS.
Wherein, order token and be temporary in SM, so that SM utilizes order, token is that same user is to NS request program playlist.
Step 318:NS returns to next program playlist to SM;
In this step, NS, according to obtaining next playlist request, utilizes order token to complete authentication, after authentication is passed through, utilizes the end mark of current program playlist, obtains the next program playlist being adjacent, and feeds back to SM.
Step 319:SM sends and plays next program playlist request to SS;
In this step, frequency and session identification that SM distributes be carried at current program playlist plug-flow in the request that sends to SS time, generate new session flow process to no longer trigger SS, utilize existing session flow process, complete the broadcasting of appending of next program playlist; Such as, SM can ask by SETUP, initiates to play next program playlist request to SS.
Step 320:SS carries out plug-flow to STB, performs step afterwards 315;
In this step, SS utilizes frequency and the session identification that current program playlist is corresponding, carries out plug-flow by IPQAM to STB, performs step afterwards 315.
Fig. 4 is the flow chart that the present invention is based on the time shift program order method embodiment bis-of NGOD.Now, in conjunction with Fig. 4, the time shift program order method that the present invention is based on NGOD of embodiment bis-is described, specific as follows:
The step 401 of the present embodiment is identical to the method for step 314 with step 301 in embodiment mono-to the method for step 414, does not repeat them here.
Now describe for the method after step 414, specific as follows:
Step 415:STB sends append request to SS;
This step can occur in step 401 to the implementation of step 414.
Wherein, in append request, at least carry reproduction time; To be STB calculate the shift time obtaining according to the end time of the initial time of current program playlist and outside definite time shift to reproduction time; The end time of outside definite time shift program can be the end time of the next time shift program that user appends by STB.
Step 416:SS sends broadcasting to the end or should be to SM to hangover;
This step can adopt the method for step 316 to realize, and does not repeat them here.
Step 417:SM sends and obtains next program playlist request to NS;
This step can adopt the method for step 317 to realize, and does not repeat them here.
Step 418:NS returns to next program playlist to SM;
This step can adopt the method for step 318 to realize, and does not repeat them here.
Step 419:SM sends and plays next the rendition list request to SS;
This step can adopt the method for step 319 to realize, and does not repeat them here.
Step 420:SS, using next program playlist as current program playlist, performs step 416, or execution step 414;
This step specifically comprises: step 4201, and whether SS exceeds the broadcasting scope of next program playlist according to the definite absolute time of reproduction time, if so, execution step 4202, otherwise execution step 4203; Step 4202, SS, using next program playlist as current program playlist, performs step 416; Step 4203, SS, using next program playlist as the program playlist appending, utilizes current frequency corresponding to program playlist, carries out plug-flow by IPQAM to STB.
Fig. 5 is the structural representation that the present invention is based on the time shift program VOD system embodiment mono-of NGOD.Now, in conjunction with Fig. 5, the time shift program VOD system that the present invention is based on NGOD of embodiment mono-is described, specific as follows:
The time shift program VOD system that the present invention is based on NGOD comprises: STB50, PORTAL51, NS52, SM53, SS54 and IPQAM55.
SS54, according to the frequency of the current program playlist of SM53 distribution, carries out the plug-flow of current program playlist to STB50 by IPQAM55; SS54 judges that current program playlist has been play to the end or to tail, is obtained next program playlist and append to NS52 by SM53; SS54, according to the frequency of current program playlist, carries out the plug-flow of next program playlist to STB50 by IPQAM55.
Wherein, SS54 comprises: plug-flow module 541, control module 542 and the first memory module 543.
Plug-flow module 541 is obtained the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to SM53, carry out the plug-flow of current program playlist to STB50 by IPQAM55, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if, end of output is indicated to control module 542, otherwise continues plug-flow.
Current session identification corresponding to program playlist distributing write the first memory module 543 by control module 542, according to finishing instruction, from the first memory module 543, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to SM53; The program playlist that SM53 is sent, as the next program playlist appending, exports plug-flow module 541 to.
The first memory module 543 is in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
Wherein, SM53 comprises list request module 531 and session control module 532.
The broadcasting that list request module 531 sends according to SS54 is answered to the end or to hangover, asks the next program playlist of current program playlist to NS52; According to frequency corresponding to the current program playlist of next program playlist and acquisition, current session identification corresponding to program playlist, send playing request to SS54.
In addition, list request module 531, also according to the time shifting broadcasting request of STB50, sends and obtains program playlist request to NS52, receives the current program playlist that NS53 returns; Send program playlist request to SS54.Wherein, current program playlist is the program playlist that SS54 does not carry out program SM53 request while appending.
The broadcasting that session control module 532 sends according to SS54 is answered to the end or to hangover, and session identification corresponding temporary current program playlist and current frequency corresponding to program playlist are sent to list request module 531.
In addition, session management module 532, in the time that NS52 returns to current program playlist, is also the frequency of STB50 distributing IP QAM, receives the program playlist response that SS54 returns, current session identification corresponding to program playlist.
Fig. 6 is the structural representation that the present invention is based on the time shift program VOD system embodiment bis-of NGOD.Now, in conjunction with Fig. 6, the time shift program VOD system that the present invention is based on NGOD of embodiment bis-is described, specific as follows:
What the time shift program VOD system based on NGOD of the present embodiment was different from embodiment mono-is the structure of SS, and other structure is identical with embodiment mono-.Now only describe with regard to the structure of SS, specific as follows:
The SS64 of the present embodiment comprises: plug-flow module 641, control module 642, locating module 643 and the first memory module 644.
Plug-flow module 641 is obtained the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to SM53, carry out the plug-flow of current program playlist to STB50 by IPQAM55, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if, end of output is indicated to control module 642, otherwise continues plug-flow.
Current session identification corresponding to program playlist distributing write the first memory module 644 by control module 642, according to finishing instruction or appending instruction, from the first memory module 644, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to SM53; The program playlist that SM53 is sent exports locating module 643 to.
The append request of carrying reproduction time that locating module 643 sends according to STB50, utilize initial time and the reproduction time of the time shift program that current program playlist comprises, calculate and obtain absolute time, judge whether absolute time exceeds the broadcasting scope of the program playlist receiving, if, transmission is appended and is indicated to control module 642, otherwise the program playlist that SM53 is sent is as the next program playlist appending, and exports plug-flow module 641 to.
The first memory module 644 is in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
In above-mentioned preferred embodiment of the present invention, SS is after judgement has completed the plug-flow of a program playlist, can trigger and obtain the next program playlist corresponding with append request from NS according to the append request of STB, or automatically append the next program playlist being adjacent according to current program playlist, adopt the frequency identical with current program playlist, by IPQAM to STB plug-flow, STB is without frequent frequency locking, also without the session between termination and SS, improved the stability of time shift program program request.In addition, method and system of the present invention have also reduced information or instruction mutual between STB and NS, SM, SS, have reduced internetwork flow.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (12)
1. the time shift program order method based on NGOD, is characterized in that, the method comprises:
Video server SS, according to the frequency of the current program playlist of session manager SM distribution, carries out the plug-flow of current program playlist to receiving terminal for digital television by edge modulator IPQAM;
Described SS judges that current program playlist has been play to the end or to tail, is obtained next program playlist and appended by described SM navigation server NS;
Described SS, according to the frequency of current program playlist, carries out the plug-flow of next program playlist to described receiving terminal for digital television by described IPQAM;
Described SS is obtained next program playlist and is appended by described SM navigation server NS and comprises:
Described SS sends and plays to the end or arrive extremely described SM of hangover;
Described SM sends and obtains next program playlist request to described NS;
Described NS returns to next program playlist to described SM;
Described SM sends and plays next program playlist request to described SS.
2. method according to claim 1, is characterized in that, described obtain next program playlist and append by described SM navigation server NS comprise:
A1, described SS send and play to the end or arrive extremely described SM of hangover;
Described broadcasting to the end or to hangover should at least carry end mark and the current session identification corresponding to program playlist of current program playlist;
A2, described SM are according to end mark and the order token corresponding with current program playlist of current program playlist, ask the next program playlist of current program playlist to described NS, according to next program playlist, send playing request to described SS;
In described playing request, at least comprise the frequency that current program playlist is corresponding, current corresponding session identification and the next program playlist of program playlist.
3. method according to claim 1, is characterized in that, the current program playlist of described judgement has been play to the end or further comprised before tail:
Receiving terminal for digital television sends the append request of carrying reproduction time to SS;
To be receiving terminal for digital television calculate the shift time obtaining according to the end time of the initial time of current program playlist and outside definite time shift to described reproduction time.
4. method according to claim 3, is characterized in that, described obtain next program playlist and append by described SM navigation server NS comprise:
B1, described SS, according to the append request of carrying reproduction time from described receiving terminal for digital television, send and play to the end or arrive extremely described SM of hangover;
Described broadcasting to the end or to hangover should at least carry end mark and the current session identification corresponding to program playlist of current program playlist;
B2, described SM are according to end mark and the order token corresponding with current program playlist of current program playlist, ask the next program playlist of current program playlist to described NS, according to next program playlist, send playing request to described SS;
In described playing request, at least comprise the frequency that current program playlist is corresponding, current corresponding session identification and the next program playlist of program playlist;
B3, described SS, according to playing request, judge whether the absolute time of being determined by reproduction time exceeds the broadcasting scope of next program playlist, if so, and execution step B4, otherwise append next program playlist described in step B2;
Described absolute time is that the broadcasting initial time of current program playlist adds the time point that reproduction time obtains;
B4, described SS, using next program playlist described in step B2 as current program playlist, send and play to the end or should, to described SM, perform step B2 to hangover.
5. according to the method described in claim 2 or 4, it is characterized in that, the described plug-flow that carries out next program playlist to receiving terminal for digital television by IPQAM comprises:
C1, described SS be according to session identification corresponding to current program playlist and playing request, keep and receiving terminal for digital television between session;
The frequency that C2, described SS are corresponding according to current program playlist, by described IPQAM, carries out the plug-flow of next program playlist to described receiving terminal for digital television.
6. the time shift program VOD system based on NGOD, this system comprises receiving terminal for digital television, digital television gateway system PORTAL, navigation server NS, session manager SM, video server SS and edge modulator IPQAM, it is characterized in that,
Described SS, according to the frequency of the current program playlist of SM distribution, carries out the plug-flow of current program playlist to receiving terminal for digital television by IPQAM;
Described SS judges that current program playlist has been play to the end or to tail, is obtained next program playlist and append to NS by described SM;
Described SS, according to the frequency of current program playlist, carries out the plug-flow of next program playlist to described receiving terminal for digital television by described IPQAM;
Described SS is obtained next program playlist and is appended by described SM navigation server NS and comprises:
Described SS sends and plays to the end or arrive extremely described SM of hangover;
Described SM sends and obtains next program playlist request to described NS;
Described NS returns to next program playlist to described SM;
Described SM sends and plays next program playlist request to described SS.
7. system according to claim 6, is characterized in that, described SS comprises:
Plug-flow module, obtain the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to described SM, carry out the plug-flow of current program playlist to described receiving terminal for digital television by described IPQAM, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if so, end of output is indicated to control module, otherwise continues plug-flow;
Control module, current session identification corresponding to program playlist distributing write to the first memory module, according to finishing instruction, from the first memory module, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to described SM; The program playlist that described SM is sent, as the next program playlist appending, exports plug-flow module to;
The first memory module, in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
8. system according to claim 6, is characterized in that, described SS comprises:
Plug-flow module, obtain the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to described SM, carry out the plug-flow of current program playlist to described receiving terminal for digital television by described IPQAM, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if so, end of output is indicated to control module, otherwise continues plug-flow;
Control module, current session identification corresponding to program playlist distributing write to the first memory module, according to finishing instruction or appending instruction, from the first memory module, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to described SM; The program playlist that described SM is sent exports locating module to;
Locating module, the append request of carrying reproduction time sending according to receiving terminal for digital television, utilize initial time and the reproduction time of the time shift program that current program playlist comprises, calculate and obtain absolute time, judge whether absolute time exceeds the broadcasting scope of the program playlist receiving, if so, send to append and indicate to control module, otherwise the program playlist that described SM is sent, as the next program playlist appending, exports plug-flow module to;
The first memory module, in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
9. according to the system described in claim 6,7 or 8, it is characterized in that, described SM comprises:
List request module, the broadcasting sending according to SS is answered to the end or to hangover, asks the next program playlist of current program playlist to described NS; According to frequency corresponding to the current program playlist of next program playlist and acquisition, current session identification corresponding to program playlist, send playing request to described SS;
Session control module, the broadcasting sending according to SS is answered to the end or to hangover, and session identification corresponding temporary current program playlist and current frequency corresponding to program playlist are sent to list request module.
10. a video server, is characterized in that, comprising:
Plug-flow module, the frequency of the current program playlist distributing according to session manager SM, carry out the plug-flow of current program playlist to receiving terminal for digital television by edge modulator IPQAM, according to the frequency of current program playlist, carry out the plug-flow of next program playlist to described receiving terminal for digital television by described IPQAM;
Control module, judges that current program playlist has been play to the end or to tail, is obtained next program playlist and appended by described SM navigation server NS;
Video server SS is obtained next program playlist and is appended by described SM navigation server NS and comprises:
Described SS sends and plays to the end or arrive extremely described SM of hangover;
Described SM sends and obtains next program playlist request to described NS;
Described NS returns to next program playlist to described SM;
Described SM sends and plays next program playlist request to described SS.
11. video servers according to claim 10, is characterized in that, this video server also comprises the first memory module:
Described plug-flow module, also for obtaining the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to described SM, carry out the plug-flow of current program playlist to described receiving terminal for digital television by described IPQAM, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if so, end of output is indicated to control module, otherwise continues plug-flow;
Described control module, also for current session identification corresponding to program playlist distributing write to the first memory module, according to finishing instruction, from the first memory module, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to described SM; The program playlist that described SM is sent, as the next program playlist appending, exports plug-flow module to;
Described the first memory module, in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
12. video servers according to claim 10, is characterized in that, this video server also comprises locating module and the first memory module:
Described plug-flow module, also for obtaining the audio, video data corresponding with current program playlist according to current program playlist, the frequency of the current program playlist distributing according to described SM, carry out the plug-flow of current program playlist to described receiving terminal for digital television by described IPQAM, when plug-flow is carried out in judgement, tail has been play to the end or arrived to program playlist whether, if so, end of output is indicated to control module, otherwise continues plug-flow;
Described control module, also for current session identification corresponding to program playlist distributing write to the first memory module, according to finishing instruction or appending instruction, from the first memory module, read end mark and the current session identification corresponding to program playlist of current program playlist, and be carried at broadcasting to the end or to hangover should, be sent to described SM; The program playlist that described SM is sent exports locating module to;
Described locating module, the append request of carrying reproduction time sending according to receiving terminal for digital television, utilize initial time and the reproduction time of the time shift program that current program playlist comprises, calculate and obtain absolute time, judge whether absolute time exceeds the broadcasting scope of the program playlist receiving, if so, send to append and indicate to control module, otherwise the program playlist that described SM is sent, as the next program playlist appending, exports plug-flow module to;
Described the first memory module, in order to preserve the end mark and the current session identification corresponding to program playlist that start mark, current program playlist of current program playlist.
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| CN102026020A (en) * | 2010-11-02 | 2011-04-20 | 深圳市佳创视讯技术股份有限公司 | Bidirectional set-top box system with time shifting on-demand service |
| CN102158746A (en) * | 2011-05-27 | 2011-08-17 | 深圳市同洲电子股份有限公司 | Instant time shifting service realization method, digital television terminal and system |
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| US7020892B2 (en) * | 1999-09-03 | 2006-03-28 | Lsi Logic Corporation | Time-shifted video signal processing |
| US7818775B2 (en) * | 2005-12-21 | 2010-10-19 | At&T Intellectual Property I, L.P. | System and method for recording and time-shifting programming in a television distribution system with limited content retention |
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| CN102026020A (en) * | 2010-11-02 | 2011-04-20 | 深圳市佳创视讯技术股份有限公司 | Bidirectional set-top box system with time shifting on-demand service |
| CN102158746A (en) * | 2011-05-27 | 2011-08-17 | 深圳市同洲电子股份有限公司 | Instant time shifting service realization method, digital television terminal and system |
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