CN101399965A - Method and device for implementing media content positioning based on EPG server - Google Patents
Method and device for implementing media content positioning based on EPG server Download PDFInfo
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Abstract
The invention discloses a method for accomplishing media content positioning based on EPG server comprising following steps: step 1, EPG server acquires information related to service agency in CDN node providing service to EPG server from total control module; step 2, EPG server acquires multi-cast address of channel from CDN network and stores every channel in multi-cast address in every CDN node; step 3, EPG server performs local media content positioning according to information related to service agency, multi-cast address of every channel in every CDN node. The EPG server acquires necessary data for local positioning from total control module, then performs local media content positioning, reduces pressure of positioning through service agency.
Description
Technical field
The present invention relates to the IPTV field, relate in particular to a kind of method and apparatus of realizing media content positioning based on EPG (ElectronicProgram Guiding, electronic program list navigation) server.
Background technology
Along with the progress of society and user to the improving constantly of high-quality life seek, the development of digital home more and more is subjected to people's attention.And provide colourful audio frequency and video service and various valued added applications business for the user, thereby promoted the development of digital home based on the IPTV (Internet Protocol Television, IPTV) of broadband network.EPG (Electronic Program Guiding, electronic program list navigation) server provides a large amount of media content such as direct broadcast band, request programs etc. as the navigation gate system that IPTV user enjoys service.How the EPG server positions these media contents quickly and accurately, will finally have influence on sense of experience of users and be subjected to.
At the CDN of IPTV system actual motion (Content Delivery Network, content distributing network) networking structure of network is generally multi-layer C DN node, the CDN node is layering in the CDN network system, usually ground floor CDN node is exactly a Centroid, and main EPG server belongs to Centroid.As shown in Figure 1, each CDN node comprises EPG server, service agent CDN Agent and stream media server S S (Streaming Server) separately, the EPG server is to information such as terminal use's display channel, programs, be cached with the context number corresponding in the EPG server with each medium content file, and the channel number corresponding with each channel.The top control module CDN Manager of content delivering system is in charge of all CDN nodes.Include locating module in the service agent, the localization message that is used for sending according to the EPG server generates the medium content file address of RTSP (RealTime Streaming Protocol, real-time streaming protocol) form.From playing on the type, the location mainly is divided into program request and live two kinds.
In such networking structure, the file distribution of program request is set up cast link between some subscriber computer top box sowing time and the streaming media server on a plurality of CDN nodes usually, and streaming media server provides order program service according to the corresponding program request file of storage for the user.When the user carries out F.F., fast reverse operation, be exactly to send corresponding F.F., reverse commands on above-mentioned cast link, streaming media server is changed the position of reading of current program request file, but what read all is medium content file itself at every turn.
Channel comprises unicast channel and direct broadcast band, and unicast channel corresponding points broadcast mode is promptly set up cast link between subscriber computer top box and the streaming media server, and streaming media server provides order program service according to the corresponding program request file of storage for the user.Direct broadcast band is to adopt multicast mode to play a real-time content, after the subscriber computer top box obtains multicast address, according to IGMP (Internet Group Management Protocol, IGMP) multicast address being added multicast group just can play, usually can in the whole network, carry out multicast for direct broadcast band, perhaps in some child node, set up relaying and carry out multicast again in the Centroid clean culture.Streaming media server has been set up a cache file, the medium content file of a certain amount of multicast of buffer memory at any time in this locality.When direct broadcast band carries out the time shift operation of rollback, the subscriber computer top box needs and streaming media server is set up a special control link, link that this is special and cast link all adopt the address path of RTSP form, be used to send the order of rollback, streaming media server is changed from the medium content file of the multicast of buffer memory and is read the position, this rollback with some sowing time is similar, just carrying out owing to live this moment always, the user reads the position when beginning to play from return back to cache file, live medium content file will be read from cache file always, streaming media server can be recorded the generation cache file in broadcast direct broadcast band limit, limit, until live end.
The EPG server that is in different CDN intranodals is generally the user who divides into groups different regions provides service.The EPG server is to the mode of media content positioning normally:
For the location of media content, normally there is a special locating interface between EPG server and the service agent at present, is used to carry out interacting message.Locate for direct broadcast band, the subscriber computer top box is to the request of EPG server initiation to certain direct broadcast band, the EPG server sends localization message to the service agent of its place CDN node, locating module in this service agent only generates SDP (the SessionDescription Protocol that channel is described usually, Session Description Protocol) file address, and it is returned to the EPG server, the EPG server sends to set-top box with the SDP file address, set-top box is consulted by Session Description Protocol and streaming media server, obtains to add multicast group behind the multicast address and play.Locate for on-demand content, the subscriber computer top box is initiated request to the EPG server, the EPG server is to the address of the service agent inquiry medium content file of its place CDN node, locating module in this service agent generates a Streaming Media address path, and it is returned to the EPG server, the EPG server sends it to the subscriber computer top box, and set-top box is carried out Signalling exchange according to this Streaming Media address path and streaming media server, the order program data stream that final playing stream media server provides.When therefore each user watches media content, set-top box is sent request to the EPG server, the EPG server needs and service agent is carried out interacting message to obtain the address of medium content file, if fault has appearred in service agent, the EPG server also needs elder generation and top control module to carry out interacting message so, top control module distributes a service agent and an EPG server in the CDN node that is in normal operating conditions to carry out interacting message, thereby makes the EPG server get access to positioning address from this service agent.Switch if the user frequently carries out channel, switch the EPG server all needs to send localization message at every turn, causes whole C DN network system positioned internal message very many like this, causes the pressure of top control module and service agent location very big.
Summary of the invention
The technical problem that the present invention solves is, provides a kind of and realizes the method and apparatus of media content positioning the EPG server being positioned to media content quickly and accurately based on the EPG server.
The technical solution used in the present invention is that described method based on EPG server realization media content positioning comprises the steps:
Step 1, EPG server regularly obtain the current server of EPG for this reason and provide the relevant information of service agent in the CDN node of service to top control module;
Step 2, EPG server obtain the multicast address of channel from the CDN network, and store the multicast address of each channel at each CDN intranodal;
Step 3, EPG server are carried out media content positioning according to the relevant information of described service agent, each channel program channel information at the multicast address and the local cache of each CDN intranodal in this locality.
The EPG server is as follows at the idiographic flow of this locality generation on-demand content positioning address:
A. the subscriber computer top box is initiated the playing request to on-demand content;
The b.EPG server generates intermediate address, and this intermediate address is returned to the subscriber computer top box according to the IP address of service agent in the CDN node of the context number of this on-demand content, current service, the locating module port numbers of this service agent;
C. the subscriber computer top box according to intermediate address directly and the service agent in the current service node carry out alternately, this service agent returns to subscriber computer top box medium content file address.
The EPG server is as follows at the idiographic flow of this locality generation direct broadcast band positioning address:
E. the subscriber computer top box is initiated the playing request to direct broadcast band;
Whether the CDN intranodal that the f.EPG server is searched in current service according to the CDN node serial number of the channel number of this channel, current service has the multicast address of this direct broadcast band, if multicast address is arranged, then the EPG server generates the time shift address, and multicast address and time shift address are all returned to the subscriber computer top box; If there is not multicast address, then the EPG server generates unicast address and it is returned to the subscriber computer top box.
A kind of device based on EPG server realization media content positioning comprises:
Acquisition module is used for electronic program list navigation EPG server and regularly obtains the relevant information that the current server of EPG for this reason provides the content distributing network CDN node service agent of service to top control module; From the CDN network, obtain the multicast address of channel.
Memory module is used to store the multicast address of each channel at each CDN intranodal.
The content locating module is used for relevant information, each channel according to described service agent in the program channel information of the multicast address and the local cache of each CDN intranodal, carries out media content positioning in this locality.
Adopt technique scheme, the present invention has following advantage at least:
The method and apparatus of realizing media content positioning based on the EPG server of the present invention, the EPG server does not need to carry out interacting message with service agent, only need to obtain the needed data in local location from top control module, generate local media content file address by the EPG server, reduced the pressure that positions by service agent.Particularly for the broadcast of direct broadcast band, in technical scheme of the present invention, the EPG server has directly provided multicast address, and the subscriber computer top box adds multicast group to be play, and has saved the process of obtaining multicast address by Session Description Protocol.Can improve the efficient of location like this.
Description of drawings
Fig. 1 is the CDN schematic network structure;
Fig. 2 regularly obtains the schematic diagram of the information that current business acts on behalf of to top control module for the EPG server;
Fig. 3 is the multicast address information of each channel of EPG server stores at each CDN intranodal;
Fig. 4 is a method flow diagram of realizing media content positioning based on the EPG server.
Embodiment
Reach technological means and the effect that predetermined purpose is taked for further setting forth the present invention,, describedly realize the method and apparatus of media content positioning based on the EPG server to what the present invention proposed below in conjunction with drawings and Examples, describe in detail as after.
First embodiment of the invention, described method based on EPG server realization media content positioning as shown in Figure 4, specifically comprises the steps:
Step 1, EPG server regularly obtain the current server of EPG for this reason and provide the relevant information of service agent in the CDN node of service to top control module, this relevant information mainly is the port numbers of locating module of service agent of IP address, current service of service agent of CDN node serial number, the current service of current service, as shown in Figure 2.The EPG server regularly to the time interval that top control module obtains this relevant information can be 2～5 minutes.Usually top control module returns to the EPG server with this relevant information, if it is unusual that the current server of EPG for this reason provides in the CDN node of service service agent to occur, top control module can be redistributed the service agent of an operate as normal and give the EPG server in the CDN node of upper strata;
Step 2, EPG server obtain the multicast address of channel from the CDN network, and store the multicast address of each channel at each CDN intranodal, as shown in Figure 3;
The mode of obtaining is: the EPG server obtains the address information of all channels at each CDN intranodal to top control module when just opening, and is that full dose is obtained herein, and stores the multicast address of each channel at each intranodal.When certain CDN intranodal channel multicast address had change, the service agent of this CDN intranodal can be notified the channel multicast address information of each its storage of EPG server update, was incremental update herein.For the channel of the whole network multicast, the multicast address of each intranodal is identical, and for the Centroid clean culture, carries out the channel of multicast at certain intranodal by trunking scheme again, and it is different that there is multicast address in different intranodal channels.
Step 3, EPG server are according to the relevant information of described service agent, each channel program channel information at the multicast address and the local cache of each CDN intranodal, carry out media content positioning in this locality, the program channel information of local cache comprises context number and channel number etc.;
The EPG server is as follows at the idiographic flow of this locality generation on-demand content positioning address:
A. the subscriber computer top box is initiated the playing request to on-demand content, establishes the request play content and is numbered 000004844355503;
The b.EPG server is according to the context number of this on-demand content: 000004844355503, the IP address of service agent CDN Agent: 221.231.144.8 in the CDN node of current service, the locating module port numbers of this service agent CDN Agent: 1554 generate intermediate address, the address that is the RTSP form is as follows: rtsp: // 221.231.144.8:1554/vod/000004844355503.mpg, wherein vod is the meaning of program request, this intermediate address is returned to the subscriber computer top box, and this shows between the service agent of subscriber computer top box and current service has set up cast link;
C. the subscriber computer top box obtains the medium content file address alternately according to the locating module of intermediate address service agent directly and in the current service node;
D. the subscriber computer top box carries out Signalling exchange according to medium content file address and streaming media server, the medium content file that the playing stream media server provides.Owing to set up the cast link of RTSP format address between the service agent of subscriber computer top box and current service, the user directly just can control the time shifting broadcasting of medium content file to the order of streaming media server transmission F.F. or rollback.
The EPG server is as follows at the idiographic flow of this locality generation direct broadcast band positioning address:
E. the subscriber computer top box is initiated the playing request to direct broadcast band, and establishing channel number is ch001;
The f.EPG server is according to the channel number of this channel: ch001, the CDN node serial number of current service: whether the CDN intranodal that 0001 each channel of storing in Fig. 3 is searched in current service in the multicast address of each intranodal has the multicast address of this direct broadcast band, if multicast address is arranged, as shown in Figure 3, multicast address is igmp: // 234.100.108.100:801, then the EPG server need generate the time shift address, the generating mode of time shift address is identical with the generating mode of some unicast address sowing time, the streaming media server that is service agent appointment in subscriber computer top box and the current CDN node is set up a special control link, use the address of RTSP form as follows: rtsp: // 221.231.144.8:1554/live/ch001.sdp, this streaming media server are cached with the partial programme content of playing in this direct broadcast band.The EPG server returns to the subscriber computer top box with the medium content file address, this medium content file address comprises multicast address and time shift address, when the user normally watched direct broadcast band, the time shifting broadcasting of medium content file was controlled in the order that can send rollback on the time shift address;
If there is not multicast address, illustrate that this channel adopts clean culture that service is provided at current C DN intranodal, this moment, the EPG server need generate the channel unicast address.The generating mode of unicast address is identical with the generating mode of some unicast address sowing time, the EPG server is according to the channel number of this channel: ch001, the IP address of service agent CDN Agent: 221.231.144.8 in the CDN node of current service, the locating module port numbers of this service agent CDN Agent: the unicast address of 1554 generation RTSP forms is as follows: rtsp: // 221.231.144.8:1554/live/ch001.sdp, wherein live is the live meaning, the EPG server returns subscriber computer top box unicast address as previously shown, and this moment, the medium content file address was a unicast address;
G. the subscriber computer top box is play according to the medium content file address of returning.In the time need carrying out time shift control to the medium content file of playing, for multicast channel, the broadcast of medium content file is controlled in the subscriber computer top box can send rollback on the time shift address order; For unicast channel,, directly just passable to the order of streaming media server transmission rollback because adopt clean culture just to set up the control link of RTSP format address originally.
Second embodiment of the invention, described device based on EPG server realization media content positioning comprises:
Acquisition module is used for electronic program list navigation EPG server and regularly obtains the relevant information that the current server of EPG for this reason provides the content distributing network CDN node service agent of service to top control module; From the CDN network, obtain the multicast address of channel.
Memory module is used to store the multicast address of each channel at each CDN intranodal.
The content locating module is used for relevant information, each channel according to described service agent in the program channel information of the multicast address and the local cache of each CDN intranodal, carries out media content positioning in this locality.
By the explanation of embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the present invention, yet appended diagram only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Claims (7)
1, a kind of method based on EPG server realization media content positioning is characterized in that, comprises the steps:
Step 1, electronic program list navigation EPG server regularly obtain the current server of EPG for this reason and provide the relevant information of service agent in the content distributing network CDN node of service to top control module;
Step 2, EPG server obtain the multicast address of channel from the CDN network, and store the multicast address of each channel at each CDN intranodal;
Step 3, EPG server are carried out media content positioning according to the relevant information of described service agent, each channel program channel information at the multicast address and the local cache of each CDN intranodal in this locality.
2, according to the described method of claim 1, it is characterized in that the relevant information of described service agent comprises: the port numbers of the locating module of the IP address of the CDN node serial number of current service, the service agent of current service, the service agent of current service based on EPG server realization media content positioning.
3, according to the described method of claim 2, it is characterized in that step 3 specifically comprises: local on-demand content positioning address and the local generation direct broadcast band positioning address of generating based on EPG server realization media content positioning.
4,, it is characterized in that the idiographic flow of described local generation on-demand content positioning address is as follows according to the described method of claim 3 based on EPG server realization media content positioning:
A. the subscriber computer top box is initiated the playing request to on-demand content;
The b.EPG server generates intermediate address, and this intermediate address is returned to the subscriber computer top box according to the IP address of service agent in the CDN node of the context number of this on-demand content, current service, the locating module port numbers of this service agent;
C. the subscriber computer top box according to intermediate address directly and the service agent in the current service node carry out alternately, this service agent returns to subscriber computer top box medium content file address.
5, according to claim 3 or 4 described methods, it is characterized in that the idiographic flow of described local generation direct broadcast band positioning address is as follows based on EPG server realization media content positioning:
E. the subscriber computer top box is initiated the playing request to direct broadcast band;
Whether the CDN intranodal that the f.EPG server is searched in current service according to the CDN node serial number of the channel number of this channel, current service has the multicast address of this direct broadcast band, if multicast address is arranged, then the EPG server generates the time shift address, and multicast address and time shift address are all returned to the subscriber computer top box; If there is not multicast address, then the EPG server generates unicast address and it is returned to the subscriber computer top box;
G. the subscriber computer top box is play according to the medium content file address of returning.
6, according to the described method of claim 5, it is characterized in that further comprising among the g based on EPG server realization media content positioning:
In the time need carrying out time shift control to the medium content file of playing, for multicast channel, the broadcast of medium content file is controlled in the subscriber computer top box sends rollback on described special control link order; For unicast channel, the user directly sends the order of rollback to streaming media server.
7, a kind of device based on EPG server realization media content positioning is characterized in that comprising:
Acquisition module is used for electronic program list navigation EPG server and regularly obtains the relevant information that the current server of EPG for this reason provides the content distributing network CDN node service agent of service to top control module; From the CDN network, obtain the multicast address of channel;
Memory module is used to store the multicast address of each channel at each CDN intranodal;
The content locating module is used for relevant information, each channel according to described service agent in the program channel information of the multicast address and the local cache of each CDN intranodal, carries out media content positioning in this locality.
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| CN105933234A (en) * | 2016-04-20 | 2016-09-07 | 乐视控股（北京）有限公司 | Node management method and system in CDN network |
| CN110234034A (en) * | 2019-06-13 | 2019-09-13 | 四川九州电子科技股份有限公司 | A kind of method of video distribution based on cable home gateway |
| CN110418389A (en) * | 2019-07-26 | 2019-11-05 | 珠海中慧微电子有限公司 | A kind of meter register method of energy measurement network |
| CN112822499A (en) * | 2019-11-15 | 2021-05-18 | 北京金山云网络技术有限公司 | Data communication method, device and system for network live broadcast and electronic equipment |
| CN112822499B (en) * | 2019-11-15 | 2023-03-07 | 北京金山云网络技术有限公司 | Data communication method, device and system for network live broadcast and electronic equipment |
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