CN101237429A - Stream media living broadcasting system, method and device based on content distribution network - Google Patents
Stream media living broadcasting system, method and device based on content distribution network Download PDFInfo
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Abstract
The embodiment of the invention discloses a streaming media live system based on a content delivery network (CDN), which is used for solving the problems that the efficiency of transmitting streaming media data to a user by the CDN is low and the service quality can not be ensured in the prior art; the system comprises: a CND service node for providing the streaming media data for a client, maintaining the information of an on-line client and responding to an acquiring request of the information; at least one client for acquiring the streaming media data from the CDN service node and/or acquiring the information of the on-line client from the CDN service node and the streaming media data from the on-line client and providing the streaming media data to respond to the requests of other clients. The embodiment of the invention also discloses a streaming media live method based on the CDN and a device thereof. The invention is adopted to greatly improve the efficiency of transmitting the streaming media data to the user and the service quality by the CDN.
Description
Technical field
The present invention relates to the Streaming Media application, relate in particular to a kind of flow medium live system, method and device of content-based distributing network.
Background technology
Along with popularizing of broadband, Streaming Media is used and has been obtained fast development.Common Streaming Media is used and is comprised business such as video represents.
Traditional by ICP (Internet Content Provider, ICP) directly provide streaming media service, concrete, ICP sets up physical node (ICP website) in one or a few place, this physical node directly orients towards the whole country and even the Global Internet user provides streaming media service, and promptly all Internet users obtain stream medium data from these physical nodes.Described physical node is made up of some streaming media servers or the cluster disposed.
Above-mentionedly directly provide the problem of streaming media service to be,, even situation about can't visit occurs because bottlenecks such as the network bandwidth of described physical node and disposal ability make user capture experience and descend by ICP.
For fear of the existence of the problems referred to above, (Content DistributionNetwork CDN) carries out streaming media data transmission to adopt content distributing network at present.
As shown in Figure 1, CDN is one deck overlay network of setting up on basis, existing the Internet, and method for building up is: dispose some CDN service nodes at first throughout the country, then these nodes are interconnected to form distributing network by the internet.CDN is distributed to the Internet user with stream medium data from the ICP website.Concrete, the know-why by CDN transport stream media data is: at first, apart from the ICP website recently or one or more best CDN service node of connection situation, obtain stream medium data from the ICP website; Then, by the CDN that sets up this stream medium data is pushed on the CDN service node near the user; At last, the user has access to required stream medium data from nearby CDN service node.Thereby CDN can greatly be alleviated the congestion situation of the Internet, postpones for the user provides low, stable information service.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following technical problem:
When visiting the CDN service node simultaneously than the multi-user, because the CDN service node is in the restriction of aspects such as bandwidth, the CDN service node gives user's efficient lower transmission of flow media data, even the user makes the service quality of transmission of flow media data can not get guaranteeing to the visit failure of CDN service node.
Summary of the invention
The embodiment of the invention provides a kind of flow medium live system, method and device of content-based distributing network, in order to solve the problem that efficient is low, service quality can not get guaranteeing that content distributing network is given transmission of flow media data the user in the prior art.
The embodiment of the invention provides the flow medium live system of a kind of content-based distributing network CDN, and this system comprises:
The CDN service node, be used for to client stream medium data is provided and safeguard the information of online client and response to the request of obtaining of this information;
At least one client links to each other with described CDN service node, is used for obtaining stream medium data from described CDN service node; And/or obtain the information of online client, and obtain stream medium data from described online client from described CDN service node; And should other client-requested provide stream medium data.
The embodiment of the invention provides the stream media live broadcasting method of a kind of content-based distributing network CDN, and this method comprises:
Client is to CDN service node acquisition request stream medium data;
Client is obtained online client information from the CDN service node;
If described client is successfully obtained described stream medium data from described CDN service node, then provide described stream medium data to described online client; Otherwise, obtain described stream medium data from described online client.
The embodiment of the invention provides a kind of content distributing network CDN service unit, and this device comprises:
The live unit of standard is used for providing stream medium data to client;
The live unit of P2P is used to safeguard the information of online client and the response request of obtaining to this information.
Beneficial effect of the present invention is:
Among the present invention, the CDN service node can be to client distribution flow media data, also safeguard online client-side information simultaneously, make client not only can obtain stream medium data from the CDN service node, can also after knowing online client-side information, obtain stream medium data from online client, simultaneously, the client with stream medium data can also provide stream medium data to other clients except that self as kind of child node.As seen, the present invention has improved efficient and the service quality of CDN to user's transport stream media data greatly in conjunction with CDN technology and P2P technology.
Description of drawings
Fig. 1 is the structural representation of CDN in the prior art;
Fig. 2 is the structural representation of system that the embodiment of the invention provides;
Fig. 3 is the work schematic diagram of system that the embodiment of the invention provides;
Fig. 4 is the schematic flow sheet of method that the embodiment of the invention provides;
Fig. 5 provides the schematic flow sheet of method example for the embodiment of the invention;
Fig. 6 is the structural representation of embodiment of the invention institute generator.
Embodiment
In order to improve efficient and the service quality of CDN to user's transport stream media data, the embodiment of the invention provides a kind of flow medium live system based on CDN, in the native system, the CDN service node of CDN is except can be to user's distribution flow media data, also safeguard online user profile, and when receiving that the user asks online user's information is offered the user, thereby this user can also obtain stream medium data from the online user.
As shown in Figure 2, the flow medium live system based on CDN that the embodiment of the invention provides comprises at least one ICP website 20, at least one CDN service node 21 and at least one client 22, wherein:
Described ICP website 20 is used for sending stream medium data to the CDN service node;
Described CDN service node 21 is used for providing stream medium data to client; And the information of safeguarding online client also responds the request of obtaining to this information;
Described client 22 links to each other with described CDN service node, is used for obtaining stream medium data from described CDN service node; Obtain the information of online client from described CDN service node, and obtain stream medium data from described online client; And should other client-requested provide stream medium data.
Concrete, described CDN service node 21 comprises live unit 30 of standard and the live unit 31 of P2P, wherein:
The live unit 30 of standard is used for providing stream medium data to client; The live unit of this standard specifically can be general streaming media server, also can be special-purpose buffer memory equipment; The live unit of standard adopts the normal stream media protocol to provide stream medium data to client, and the normal stream media protocol includes but not limited to: MMS (Multimedia Message Service) (MMS) agreement, real time streaming protocol (rtsp) etc.;
The live unit 31 of P2P is used to safeguard the information of online client and the response request of obtaining to this information.The live unit of this P2P specifically can be the server that can move the P2P host-host protocol.
More specifically, the live unit 31 of P2P comprises maintenance of information unit and requesting processing, wherein:
The maintenance of information unit is used to receive the status report from client, and according to this status report online client information is set up, safeguarded and upgrades;
Requesting processing is used to receive the request of obtaining to online client information from client, inquires about the online client information of self preserving and sends to described client.
Described maintenance of information unit and requesting processing can be arranged in the unit, also can divide to be arranged, and maintenance of information unit and requesting processing are arranged in the unit, meeting point (RP) 40 in the accompanying drawing 2.
Preferable, in order to reduce the time of the medium pending data of the client adding live process of P2P, need provide the auxiliary data of carrying out in P2P data transmission procedure source for client, thus, the live unit of described P2P further comprises:
Data source (DS) unit 41 is used in described client providing stream medium data to described client when described online client is obtained stream medium data.This DS unit specifically adopts the P2P host-host protocol to provide stream medium data to described client.The P2P host-host protocol comprises but is not limited to: BitTorrent (BT) agreement, emule agreement etc.
Preferable, in order to make whether the DS unit can provide stream medium data to client according to the state decision of client, and the live unit 31 of described P2P further comprises:
The state-maintenance unit, be used to safeguard the client's state information of obtaining stream medium data from the DS unit, processing is from the status report of described client, when comprising the status report that receives from described client, whether continue to provide stream medium data to described client according to this status report notice DS unit.Concrete, if the state information that the status report that described client sends comprises is online, then notify the DS unit to continue to provide stream medium data to described client; If the state information that the status report that described client sends comprises is an off-line, then notify the DS unit to stop to provide stream medium data to described client.
Preferable, for flexibility that improves transfer of data and the redundancy that reduces transfer of data, reduce the wasting of resources in the transmission course, the DS unit need decide to client transmission part or complete stream media data according to the situation that client is obtained stream medium data by the P2P mode, thus, the live unit 31 of described P2P further comprises:
The transmission ratio control unit is used for providing stream medium data to account for the ratio of complete stream media data according to the control signaling DS unit adjustment of receiving to described client.
Described control signaling can come to obtain since the DS unit client of data, specifically comprise following three kinds of situations:, notify described CDN service node to send complete stream medium data to described client described client not when online client gets access to stream medium data (usually occur in client and online client and set up the P2P access phase); And, when online client gets access to the part stream medium data, notify described CDN service node to stop to send the stream medium data of described part in described client to described client; And, when online client gets access to the complete stream media data, notify described CDN service node to stop to send stream medium data in described client to described client.
When dividing the various piece of stream medium data, can adopt following method:
Stream medium data has two main attributes usually, i.e. the sequence number of packet and timestamp, and wherein sequence number is continuously and increases progressively, and is used for the order that identification data packet sends, and checks whether have data to lose in transmission course; Timestamp then is used to represent the time that represents of the contained audio-video frequency content of these data.According to these two attributes, stream medium data can be divided into a plurality of parts, for example: with data according to sequence number odd even separated into two parts, perhaps data are divided into ten parts according to timestamp, or the like, division methods can have multiple, only provides several typical examples here.The DS unit can improve the flexibility of data dispatch and the redundancy that reduces transfer of data by adjusting full content or certain partial content that sends stream medium data to client, reduces the wasting of resources in the transmission course.
Concrete, described client 22 comprises standard acquiring unit 42, P2P acquiring unit 43 and shared cell 44, wherein:
Standard acquiring unit 42 is used for obtaining stream medium data from described CDN service node; This standard acquiring unit adopts the normal stream media transmission protocol to obtain stream medium data;
The standard acquiring unit can preferentially obtain stream medium data from the CDN service node, if obtain success, then the P2P acquiring unit no longer obtains stream medium data from online client; Otherwise the P2P acquiring unit obtains stream medium data by visit CDN service node from online client.Also can be that P2P acquiring unit and standard acquiring unit obtain stream medium data from the CDN service node simultaneously.
The P2P acquiring unit can finally be risked complete stream medium data to the different piece of a plurality of online client request stream medium datas when other online client are obtained stream medium data.Concrete data capture method is: after described client and other online client are set up P2P and are connected, send Streaming Media to online client and obtain request, online client sends corresponding stream media data according to this request to the client of this request of transmission.Described Streaming Media obtains in the request can comprise the identification information that need obtain data division, and for example timestamp, sequence number etc., online client send the appropriate section of stream medium data to client according to this identification information;
Preferable, the P2P acquiring unit can also obtain stream medium data in the P2P mode from the DS unit of CDN service node when online client is obtained stream medium data, to reduce the time of the medium pending data of the client adding live process of P2P.Along with the increase of the data division that comes from online client, client can reduce the data division to the DS unit requests gradually, up to stopping to obtain data to the DS unit fully, finally provides follow-up data by online client.
Shared cell 44 is used for providing stream medium data to other clients except that self.Concrete, after standard acquiring unit of this client or P2P acquiring unit successfully get access to data, become kind of a child node, set up the P2P member relation with current other online clients, specifically be to set up P2P with current other online clients to be connected, wait for that other clients send data acquisition request to it, and provide corresponding stream media data according to the request of receiving.
More specifically, described shared cell 44 comprises converting unit and transmitting element, wherein:
Converting unit is used for converting stream medium data to P2P host-host protocol predetermined data form;
Transmitting element is used for the stream medium data after the described conversion is sent to client except that self.
Described client further comprises:
As shown in Figure 3, the system that the embodiment of the invention provides is under the less relatively situation of the number of visiting people, can utilize equipment and the Internet resources of existing CDN, the mode live by standard provides service to the Internet user, and this moment, client will mainly be obtained data from the standard direct broadcast server; In the sudden growth of the number of visiting people and exceed under the situation of load capacity of CDN resource, it is live to enable P2P, make full use of online user's Internet resources, serve more user, with above-mentioned access criteria direct broadcast server as data source, set up P2P overlay network extensive, multi-source, thus stable, distribution flow media data efficiently.
Referring to Fig. 4, the embodiment of the invention also provides a kind of stream media live broadcasting method based on CDN, and this method may further comprise the steps:
Step 40: client is to CDN service node acquisition request stream medium data;
Here, customer end adopted normal stream media protocol is obtained stream medium data from described CDN service node.Described normal stream media protocol includes but not limited to: MMS, RTSP etc.
Step 41: judge whether described client successfully obtains stream medium data from described CDN service node, if step 42 is then arrived in success; Otherwise, to step 43;
Step 42: provide described stream medium data to current online client;
Here, client described stream medium data need be converted to P2P host-host protocol predetermined data form, and the stream medium data after will changing sent to online client before providing stream medium data to current online client.
Step 43: obtain described stream medium data from current online client.
Need to prove that client need be obtained the information of current online client from the CDN service node in step 42 or the step 43, this obtaining step can be carried out before step 42 or step 43, also can carry out in step 42 or step 43.
Preferable, when described current online client is obtained described stream medium data, can also adopt the P2P host-host protocol to obtain stream medium data in client from described CDN service node, be about to the CDN service node as auxiliary data source.Described P2P host-host protocol comprises but is not limited to: BitTorrent agreement, emule agreement etc.
Concrete, when customer end adopted P2P host-host protocol obtains stream medium data from the CDN service node, can dynamically adjust and obtain the shared ratio of data, specifically comprise following three kinds of situations:
Not when described online client gets access to stream medium data, notify described CDN service node to send complete stream medium data in described client to described client; And:
When described online client gets access to the part stream medium data, notify described CDN service node to stop to send the stream medium data of described part in described client to described client; And:
When described online client gets access to the complete stream media data, notify described CDN service node to stop to send stream medium data in described client to described client.
In this method, client needs timing to CDN service node uploaded state information, and online client-side information is set up, safeguards and upgraded to the CDN service node according to the state information of receiving.
Below the method that the embodiment of the invention provides is described in conjunction with the described system of Fig. 2:
As shown in Figure 5, specifically may further comprise the steps:
The ICP website of step 501:CDN is distributed to the CDN service node that direct user oriented provides service with the stream medium data of required issue, and working simultaneously in live unit of standard and the live unit of P2P in this CDN service node, provides service towards the Internet user;
Step 502:CDN service node is to two unified resource location (URL) address: URL1 of client issue and URL2, wherein URL1 is used for the standard direct broadcast service, URL2 is used for the P2P direct broadcast service, can two URL addresses be distributed to the user by character string forms or page script form;
Step 503: if client has been installed client-side program, then change step 507 over to, otherwise change step 504 over to;
Step 504: client is passed through third party's player linking URL 1, and then obtains stream medium data from the live unit of standard;
Step 505:, otherwise change step 506 over to if play successfully then finish the Streaming Media transmission course;
Step 506: the prompting client user installs client-side program;
Step 507: the client-side program linking URL 1 of client by installing;
Step 508:, then change step 509 over to, otherwise change step 510 over to if can successful connection and obtain stream medium data;
Step 509: client-side program linking URL 2, with the RP unit communication in the live unit of P2P, obtain the information of other online client, and set up P2P equity member relation with other online client, provide stream medium data to other online client, change step 514 over to;
Step 510: client-side program linking URL 2, with the RP module communication in the live unit of P2P, obtain the information of other online client program, set up P2P equity member relation with other online client, and to other online client request stream medium data, the DS unit requests stream medium data of while in the live unit of P2P;
Step 511: client-side program if client gets access to partial data from other online client, and is not complete data from other online client and DS unit while receiving stream media data, then changes step 512 over to; If client obtains complete stream medium data from other online client, then change step 513 over to;
Step 512: according to the acquired situation that comes from the data division of other online client, notice DS unit stops the transmission of the data of appropriate section, changes step 511 over to;
Step 513: client-side program stops the request data in units to DS, provides follow-up data by other online client, changes step 514 over to;
Step 514: client-side program obtains stable streaming media data stream and buffering area and is filled, then begins to play, and the stream medium data distribution is finished.
Referring to Fig. 6, the embodiment of the invention also provides a kind of content distributing network CDN service unit, can be used for the flow medium live system based on CDN, and this device comprises:
The live unit 60 of standard is used for providing stream medium data to client; The live unit of this standard is with adopting the normal stream media protocol to provide stream medium data to client.
The live unit 61 of P2P is used to safeguard the information of online client and the response request of obtaining to this information.
The live unit 61 of described P2P comprises:
Maintenance of information unit 81 is used to receive the status report from client, and according to this status report online client information is set up, safeguarded and upgrades;
Requesting processing 82 is used to receive the request of obtaining to online client information from client, inquires about the online client information of self preserving and sends to described client.
Maintenance of information unit 81 and requesting processing 82 can be arranged in the unit, also can divide to be arranged, and maintenance of information unit 81 and requesting processing 82 are arranged in the unit, meeting point (RP) 70 in the accompanying drawing 6.
The live unit 61 of described P2P further comprises:
Data source (DS) unit 71 is used in described client providing stream medium data to described client when described online client is obtained stream medium data.This data source unit adopts the P2P host-host protocol to provide stream medium data to described client.
The live unit 61 of described P2P further comprises:
Whether state-maintenance unit 72 is used to receive the status report from described client, and continue to provide stream medium data to described client according to this report notice DS unit.
The live unit 61 of described P2P further comprises:
Transmission ratio control unit 73 is used for providing stream medium data to account for complete stream media data ratio according to the control signaling DS unit adjustment of receiving to described client.
To sum up, beneficial effect of the present invention is:
Among the present invention, the CDN service node can to client distribution flow media data, also be maintained in simultaneously The line client-side information so that client not only can be obtained stream medium data from the CDN service node, also can After knowing online client-side information, to obtain stream medium data from online client, simultaneously, has Streaming Media The client of data can also provide the Streaming Media number to other clients except self as kind of child node According to. As seen, the present invention has greatly improved CDN and has transmitted to the user in conjunction with CDN technology and P2P technology The efficient of stream medium data and service quality.
The present invention takes full advantage of equipment and the network of existing CDN in the relatively less situation of the number of visiting people Resource, the mode live by standard provides service to the Internet user, guarantees service quality, and has startup Hurry up, postpone low, as to play smoothness characteristics; In the number of visiting people sudden growth and exceed the CDN resource In the situation of load capacity, enable the P2P direct broadcast service, take full advantage of online user's Internet resources, prop up Hold more user, guarantee service quality simultaneously, for the gradually expansion of Stream Media Application scale, the present invention Have good autgmentability and flexibility.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from this Bright spirit and scope. Like this, if belonging to claim of the present invention, these modifications of the present invention and modification reach The range of its equivalent technologies, then the present invention also be intended to comprise these change and modification interior.
Claims (11)
1, the flow medium live system of a kind of content-based distributing network CDN is characterized in that, this system comprises:
The CDN service node, be used for to client stream medium data is provided and safeguard the information of online client and response to the request of obtaining of this information;
At least one client links to each other with described CDN service node, is used for obtaining stream medium data from described CDN service node; And/or obtain the information of online client, and obtain stream medium data from described online client from described CDN service node; And should other client-requested provide stream medium data.
2, the system as claimed in claim 1 is characterized in that, described CDN service node comprises:
The live unit of standard is used for providing stream medium data to client;
The live unit of P2P is used to safeguard the information of online client and the response request of obtaining to this information.
3, system as claimed in claim 2 is characterized in that, the live unit of described P2P comprises:
The maintenance of information unit is used to receive the status report from client, and according to this status report online client information is set up, safeguarded and upgrades;
Requesting processing is used to receive the request of obtaining to online client information from client, inquires about the online client information of self preserving and sends to described client.
4, system as claimed in claim 3 is characterized in that, the live unit of described P2P further comprises:
The data source unit is used in described client providing stream medium data to described client when described online client is obtained stream medium data.
5, system as claimed in claim 4 is characterized in that, the live unit of described P2P further comprises:
The transmission ratio control unit is used for providing stream medium data to account for the ratio of complete stream media data according to the described data source of the control signaling unit adjustment of receiving to described client.
6, the stream media live broadcasting method of a kind of content-based distributing network CDN is characterized in that, this method comprises:
Client is to CDN service node acquisition request stream medium data;
Client is obtained online client information from the CDN service node;
If described client is successfully obtained described stream medium data from described CDN service node, then provide described stream medium data to described online client; Otherwise, obtain described stream medium data from described online client.
7, method as claimed in claim 6 is characterized in that, when described online client was obtained described stream medium data, this method further comprised in described client:
Described customer end adopted P2P host-host protocol obtains stream medium data from described CDN service node.
8, method as claimed in claim 7 is characterized in that, described client is obtained stream medium data from described CDN service node and comprised:
Not when described online client gets access to stream medium data, notify described CDN service node to send complete stream medium data in described client to described client;
When described online client gets access to the part stream medium data, notify described CDN service node to stop to send the stream medium data of described part in described client to described client;
When described online client gets access to the complete stream media data, notify described CDN service node to stop to send stream medium data in described client to described client.
9, a kind of content distributing network CDN service unit is characterized in that this device comprises:
The live unit of standard is used for providing stream medium data to client;
The live unit of P2P is used to safeguard the information of online client and the response request of obtaining to this information.
10, device as claimed in claim 9 is characterized in that, the live unit of described P2P comprises:
The maintenance of information unit is used to receive the status report from client, and according to this status report online client information is set up, safeguarded and upgrades;
Requesting processing is used to receive the request of obtaining to online client information from client, inquires about the online client information of self preserving and sends to described client.
11, device as claimed in claim 10 is characterized in that, the live unit of described P2P further comprises:
The data source unit is used in described client providing stream medium data to described client when described online client is obtained stream medium data.
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| CN200810100892A CN101237429B (en) | 2008-02-25 | 2008-02-25 | Stream media living broadcasting system, method and device based on content distribution network |
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