CN102572548A - Content distributing method and system - Google Patents
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Abstract
The invention provides a content distributing method and a content distributing system. The content distributing method comprises the steps of: preprocessing a scalable video coding (SVC) file by a central node to generate a hierarchical file; and distributing the hierarchical file to edge nodes according to different distribution strategies. The content distributing system comprises the center node and the edge nodes, wherein the center node is used for preprocessing the SVC file to generate the hierarchical file and distributing the hierarchical file to the edge nodes according to different distribution strategies. According to the content distributing method and the content distributing system disclosed by the invention, storage waste and management complexity are reduced, and a multi-screen service can be supported effectively.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of content distribution method and system.
Background technology
Content distributing network (Content Delivery Network; CDN) purpose is through in existing internet (Internet), increasing the new network architecture of one deck; With the content release of website near user's network " edge "; Make the user can obtain required content nearby, solve the situation of Internet network congestion, improve the response speed of user capture website.Solve the slow-footed problem of user capture little owing to the network bandwidth, that the user capture amount is big, the unequal reason of network point distribution causes technically comprehensively.
At present the distribution of audio-video frequency content transmits more and more generally on the Internet, how to guarantee to use the terminal use of various different abilities can be from different places, with the various content of multimedia of various bandwidth access, and this specification requirement to CDN is very high; Particularly, have the fused business ability that multiple terminal access need be provided like Web TV (IPTV) multimedia system now along with the development of the integration of three networks.As unified content distributing network, need have the ability that favorable user experience is provided for various terminal uses for CDN.
Common CDN system; The multimedia file that injects for the outside carries out storage and uniform; But use the fully independently multimedia file of different resolution, code check to different terminal; Through unified content distribution policy each file is distributed to the edge from the center then, for the end user provides service; Though this method can support multi-screen professional,, management bigger for the waste of storage be complicacy relatively also.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of content distribution method and system, to reduce, support multi-screen professional effectively to the waste of storage and the complexity of management.
The invention provides a kind of content distribution method, this method comprises:
Centroid carries out preliminary treatment to scalable video coding (SVC) file, generates hierarchical file; And
According to different distribution policies said hierarchical file is distributed to fringe node.
Preferably, this content distribution method can have following characteristics:
Said Centroid carries out preliminary treatment to the SVC file, generates hierarchical file and comprises:
Said Centroid is resolved the said SVC file that obtains; And according to the independent hierarchical file of hierarchical information generation that parses; And said hierarchical file stored, wherein this hierarchical file comprises basic layer file and one or more enhancement layer files;
Said Centroid generates SVC file global logic sign when generating hierarchical file, and sets up the mapping relations between SVC file global logic sign and each hierarchical file.
Preferably, this content distribution method can have following characteristics:
Said Centroid is distributed to fringe node according to different distribution policies with said hierarchical file and comprises:
Said Centroid all is distributed to fringe node with a basic layer file, and enhancement layer files is judged whether that according to the terminal type of fringe node service needs are distributed to fringe node.
Preferably, this content distribution method can have following characteristics:
Said method also comprises: if said fringe node obtains needed enhancement layer files from said Centroid when confirming self not have the enhancement layer files of terminal needs.
Preferably, this content distribution method can have following characteristics:
Said fringe node obtains needed enhancement layer files from said Centroid and comprises:
Said fringe node sends query messages to said Centroid; Carry SVC file global logic sign in the said query messages; The enhancement layer files address information that the receiving center node returns, and obtain needed enhancement layer files according to said enhancement layer files address information.
The present invention also provides a kind of content delivering system, and this system comprises Centroid and fringe node, wherein:
Said Centroid is used for scalable video coding (SVC) file is carried out preliminary treatment, generates hierarchical file; And said hierarchical file is distributed to fringe node according to different distribution policies.
Preferably, the foregoing dissemination system can have following characteristics:
Said Centroid comprises:
Content processing module; Be used for the said SVC file that received content injection/acquisition module is transmitted; Said SVC file is resolved; And generate hierarchical file according to the hierarchical information that parses, and said hierarchical file is stored in the content storage module, wherein this hierarchical file comprises basic layer file and one or more enhancement layer files;
The content metadata server is used for when content processing module generates hierarchical file, generates SVC file global logic sign, and sets up the mapping relations between global logic sign and each hierarchical file.
Preferably, the foregoing dissemination system can have following characteristics:
Said Centroid is further used for basic layer file all is distributed to fringe node, and enhancement layer files is judged whether that according to the terminal type of fringe node service needs are distributed to fringe node.
Preferably, the foregoing dissemination system can have following characteristics:
Said fringe node also is used for when confirming self not have the enhancement layer files of terminal needs, obtaining needed enhancement layer files from said Centroid.
Preferably, the foregoing dissemination system can have following characteristics:
Said fringe node comprises: the content delivery functional entity; Be used for sending query messages to said content metadata server; Carry SVC file global logic sign in the said query messages; Receive the enhancement layer files address information that said content metadata server returns, and obtain needed enhancement layer files according to said enhancement layer files address information.
Foregoing distribution method and system have reduced the waste of storage and the complexity of management, can support multi-screen professional effectively.
Description of drawings
Fig. 1 is the flow chart of embodiment of the invention content distribution method;
Fig. 2 is embodiment of the invention SVC file logical layered architecture and usage example figure;
Fig. 3 is that embodiment of the invention CDN system is to the SVC file process of injection and the flow chart of distribution;
Fig. 4 is the signaling process figure of the on-demand process of layering SVC file among access CDN of the embodiment of the invention;
Fig. 5 is the logical architecture figure of embodiment of the invention content delivering system.
Embodiment
Below in conjunction with accompanying drawing the enforcement of technical scheme is done to describe in detail further:
At present; H.264 scalable video coding (the Scalable Video Codec that unites formulation by International Telecommunications Union's telecommunication standards tissue (ITU-T) and joint video code sets (JVT); SVC) standard is on the basis of advanced video codec (AVC) standard H.264; The various highly effective algorithm instruments of AVC codec have been utilized; The encoded video that produces at coding on the time on (frame per second), the space (resolution) can expand, can produce the decoded video of different frame rates, resolution or credit rating.Itself is suitable for the same content of encoding SVC very much, for the terminal of multiple different abilities service (extract basic layer according to terminal capability and add one or more enhancement layers) is provided simultaneously.The present invention mainly concentrates on the CDN system content of SVC Unified coding is carried out effective pre-processing, had and store tactfully and distribute, and the implementation method of multi-screen fused business ability is provided for multiple terminal efficiently.
As shown in Figure 1, be the flow chart of content distribution method of the present invention, this method comprises:
This hierarchical file can comprise basic layer file and one or more enhancement layer files; The SVC file comprises a basic layer and two enhancement layers among Fig. 2, and wherein, basic layer can be used to low resolution/terminal of low code check such as the service that mobile phone provides standardized images form (CIF) resolution separately; Enhancement layer 1 adds that basic layer can provide the terminal of intermediate resolution/code check such as the TV service of SD STB (STB); Similarly, enhancement layer 2 adds that basic layer and enhancement layer 1 can provide the terminal of high-resolution/code check such as the TV service of high definition STB;
Technical scheme that the present invention adopts and common way are inequality; In order to save the CDN memory space; Simultaneously also can realize carrying out based on fringe node service terminal type the convenience of content scheduling, the Centroid of CDN of the present invention system carries out preliminary treatment to the content of the SVC coded format injected, according to the layering situation of SVC inside; The individual files that generates each layer in advance is a basic layer file, adds one or more enhancement layer files; When generating hierarchical file, also generate a SVC content metadata (Metadata) file and be used for describing the logical relation between each hierarchical file of SVC.Use a unique logical number sign SVC content for original SVC file, set up the mapping relations of this logical identifier and each hierarchical file simultaneously.The basic layer file that generates can be used for the terminal access that the ability that represents is lower, access bandwidth is less and plays like the cellphone subscriber usually; For the terminal such as STB, the TV etc. that support SD or high definition; The CDN system is on except the basis that basic layer file transfer is provided; Also to add the synchronous transmission of one or more enhancement layers (each enhancement layer is corresponding to a kind of terminal capability such as screen resolution, program stream, and CDN can carry out the selection of corresponding document according to terminal capability).What need special instruction is that a plurality of independently SVC hierarchical files that the CDN Centroid generates preliminary treatment adopt different strategies in CDN the whole network, to distribute.Simply, the file of basic layer will all be distributed to each fringe node, and the file of one or more enhancement layers will be according to the selective fringe node that is distributed to of certain strategy.The terminal type that strategy is so generally served based on the CDN fringe node; To this fringe node has only the situation of basic layer file in case occur for stronger certain fringe node of terminal access CDN of ability, it is that user terminal provides service that the CDN fringe node can be downloaded the enhancement layer content from Centroid in real time through agency's method.
As shown in Figure 3; For CDN of the present invention system to the SVC file process injected and the schematic flow sheet of distribution; This process comprises: content injection/acquisition module receives the SVC content of content supplier (CP) injection from the outside, and gives content processing module with the SVC file and carry out preliminary treatment; Content processing module is resolved the hierarchical information of SVC file and the SVC content is divided into independently file and stores (for example basic layer corresponding one independently file, extension layer 1 corresponding another one corresponding the 3rd file or the like independently of file, extension layer 2 independently); The content metadata server generates SVC file global logic sign simultaneously, and sets up the mapping relations between global logic sign and each unique file; Above-mentioned work is mainly accomplished at the Centroid of CDN.Then, Centroid according to certain strategy with the file distributing of layering to CDN regional center or fringe node, concrete distribution policy is: at first preferentially a basic layer stand-alone content is distributed to CDN regional center or fringe node; Then judge the service terminal type of fringe node for the distribution of enhancement layer content; For example only provide the node of mobile phone flow medium service only to issue basic layer file, for providing node also need issue part or all of enhancement layer files like SD/high definition TV service for some.If occur that certain CDN fringe node of access needs enhancement layer files but on node and non-existent situation, after the CDN fringe node obtains corresponding enhancement layer content from Centroid, carry out for the terminal use service being provided again synchronously with basic layer content.
As shown in Figure 4, be the signaling process figure of the on-demand process of layering SVC file among access CDN of the present invention, this process comprises:
Step 401, user terminal such as STB initiate the request command of content play request message such as real-time flow host-host protocol description (RTSP Describe) to CDN;
Comprise in this request message that the unified sign of content ID is the SVC file consolidation logical identifier ID that mentions among the present invention and information such as the descriptor of self terminal capability such as terminal resolution; Wherein, this SVC file consolidation logical identifier ID can be obtained from business navigation door by this user terminal in advance;
Step 402, the cluster controlled function entity that CDN controlled function entity selection is suitable, and user terminal requests message sent to the cluster controlled function entity of choosing;
Step 403, the content delivery functional entity that cluster controlled function entity selection is suitable, and user terminal requests message is sent to content selected pay functional entity;
After step 404, content delivery functional entity are received user terminal requests message, judge the terminal ability such as resolution, support bandwidth etc., and need to judge whether to remove the enhancement layer content basic layer of the SVC to terminal transmission;
Step 405, only there be basic layer fileinfo if need transmit enhancement layer content and current content delivery functional entity to the user; Then the content delivery functional entity can carry the SVC content and unify logical identifier information to the related enhancement layer files information of CDN Centroid meta data server inquiry in the query messages.Meta data server returns corresponding enhancement layer files address information; Need to prove: if preserved corresponding metadata information, then this step can be omitted in the CDN fringe node.
Step 406, content delivery functional entity then obtain the information of SVC enhancement layer files to CDN center/other nodes (depending on the address information of returning in the step 405);
The response message of step 407, while content delivery functional entity structuring user's request message; Response message and single SVC file SDP response message are similar; Comprise a plurality of RTP session informations in the message; Each RTP session has also defined the dependence between them simultaneously corresponding to a basic layer or enhancement layer SDP descriptor; Response message finally returns to user terminal through cluster controlled function entity, CDN controlled function entity;
Step 408, user terminal be then according to the one or more RTP session informations in the return messages, from the content delivery functional entity parallel obtain the media content of each layer of SVC and at the terminal decoding accomplish and play.
The foregoing distribution method through the SVC file being generated hierarchical file, and sends to fringe node with hierarchical file according to different strategies, thereby can support multi-screen professional effectively.
As shown in Figure 5, for the logical architecture figure of content delivering system of the present invention, in this system, above-mentioned Centroid 11 is used for scalable video coding (SVC) file is carried out preliminary treatment, generates hierarchical file; And above-mentioned hierarchical file is distributed to fringe node according to different distribution policies.Wherein, This Centroid comprises the CDN controlled function entity 111 of being responsible for CDN overall situation signaling control, also comprises content injection/acquisition module (Content Ingestion/Acquisition) 112, content processing module (Content Processing) 113, content storage module (Content Storage) 114 and content metadata server (Metadata Server) 115; Wherein, content injection/acquisition module provides the interactive interface with outside CP content injected system, is responsible for receiving the outside content of injecting; Content processing module is responsible for further handling injecting content, mainly the SVC file is carried out layering in the present invention and handles; Content storage module is mainly to injecting non-SVC content and pretreated SVC content is carried out overall storage and uniform; The metadata information of content among content metadata server (Metadata Server) the storage CDN, usually available for example database mode are realized, need write down the mapping relations that generate each independent hierarchical file and SVC content global logic sign in the present invention.
Preferably, above-mentioned Centroid can be further used for basic layer file all is distributed to fringe node, and enhancement layer files is judged whether that according to the terminal type of fringe node service needs are distributed to fringe node.
The regional center of this system or fringe node 12 generally include cluster controlled function entity (Cluster Control Function; CCF) 121 with content delivery functional entity (Content Delivery Function; CDF) 122; Wherein, cluster controlled function entity is mainly realized the signaling control of content distribution and content service, and the content delivery functional entity is mainly realized the transmission of content stores and content stream.
In addition, above-mentioned fringe node can obtain needed enhancement layer files from above-mentioned Centroid when confirming self not have the enhancement layer files of terminal needs.
Preferably; Foregoing is paid functional entity and can be used for sending query messages to above-mentioned content metadata server; Carry SVC file global logic sign in the above-mentioned query messages; Receive the enhancement layer files address information that the foregoing meta data server returns, and obtain needed enhancement layer files according to above-mentioned enhancement layer files address information.
This content delivering system can be accomplished the content distribution, and idiographic flow can repeat no more referring to Fig. 1, Fig. 3 and Fig. 4 here.
The foregoing dissemination system generates hierarchical file through Centroid with the SVC file, and hierarchical file is sent to fringe node according to different strategies, thereby can support multi-screen professional effectively.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said procedure can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, only with reference to preferred embodiment the present invention is specified.Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and the scope of technical scheme of the present invention, all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. a content distribution method is characterized in that, said method comprises:
Centroid carries out preliminary treatment to scalable video coding (SVC) file, generates hierarchical file; And
According to different distribution policies said hierarchical file is distributed to fringe node.
2. content distribution method according to claim 1 is characterized in that said Centroid carries out preliminary treatment to the SVC file, generates hierarchical file and comprises:
Said Centroid is resolved the said SVC file that obtains; And according to the independent hierarchical file of hierarchical information generation that parses; And said hierarchical file stored, wherein this hierarchical file comprises basic layer file and one or more enhancement layer files;
Said Centroid generates SVC file global logic sign when generating hierarchical file, and sets up the mapping relations between SVC file global logic sign and each hierarchical file.
3. content distribution method according to claim 2 is characterized in that, said Centroid is distributed to fringe node according to different distribution policies with said hierarchical file and comprises:
Said Centroid all is distributed to fringe node with a basic layer file, and enhancement layer files is judged whether that according to the terminal type of fringe node service needs are distributed to fringe node.
4. content distribution method according to claim 2 is characterized in that, said method also comprises:
If said fringe node obtains needed enhancement layer files from said Centroid when confirming self not have the enhancement layer files of terminal needs.
5. content distribution method according to claim 4 is characterized in that, said fringe node obtains needed enhancement layer files from said Centroid and comprises:
Said fringe node sends query messages to said Centroid; Carry SVC file global logic sign in the said query messages; The enhancement layer files address information that the receiving center node returns, and obtain needed enhancement layer files according to said enhancement layer files address information.
6. a content delivering system is characterized in that, this system comprises Centroid and fringe node, wherein:
Said Centroid is used for scalable video coding (SVC) file is carried out preliminary treatment, generates hierarchical file; And said hierarchical file is distributed to fringe node according to different distribution policies.
7. content delivering system according to claim 6 is characterized in that, said Centroid comprises:
Content processing module; Be used for the said SVC file that received content injection/acquisition module is transmitted; Said SVC file is resolved; And generate hierarchical file according to the hierarchical information that parses, and said hierarchical file is stored in the content storage module, wherein this hierarchical file comprises basic layer file and one or more enhancement layer files;
The content metadata server is used for when content processing module generates hierarchical file, generates SVC file global logic sign, and sets up the mapping relations between global logic sign and each hierarchical file.
8. content delivering system according to claim 6 is characterized in that:
Said Centroid is further used for basic layer file all is distributed to fringe node, and enhancement layer files is judged whether that according to the terminal type of fringe node service needs are distributed to fringe node.
9. content delivering system according to claim 7 is characterized in that:
Said fringe node also is used for when confirming self not have the enhancement layer files of terminal needs, obtaining needed enhancement layer files from said Centroid.
10. content delivering system according to claim 9 is characterized in that, said fringe node comprises:
The content delivery functional entity; Be used for sending query messages to said content metadata server; Carry SVC file global logic sign in the said query messages; Receive the enhancement layer files address information that said content metadata server returns, and obtain needed enhancement layer files according to said enhancement layer files address information.
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