CN102006331B - Method for sending media information, terminal and peer-to-peer (P2P) system - Google Patents
Method for sending media information, terminal and peer-to-peer (P2P) system Download PDFInfo
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Abstract
The invention provides a method for sending media information, a terminal and a peer-to-peer (P2P) system. The method for sending the media information comprises the following steps of: receiving a node list returned by a P2P server according to a data request, wherein the node list comprises a media information providing node for providing the media information and a control information providing node for providing control information for verifying the media information, and the media information providing node and the control information providing node are respectively different first-level intermediate nodes connected with a caching server for providing credible information; requesting the media information and the control information of the media information providing node and the control information providing node respectively according to the indication of the node list; and receiving the media information and the control information which are returned by the media information providing node and the control information providing node respectively. In the method for sending the media information, the terminal and the P2P system, by separating the control information and the media information strictly, the safety of sending the media information is improved.
Description
Technical field
The present invention relates to a kind of point-to-point Media Stream technology, relate in particular to a kind of media information sending method, terminal and P2P system.
Background technology
Along with popularizing day by day of the Internet and developing rapidly of new technology, large quantities of emerging network-multimedia application begin to emerge in large numbers and become the important part in people's work, the life, for example: Web TV, competitive sports broadcasting, game on line, long-distance education etc., and these multimedia application need the support of stream media technology, point-to-point (peer to peer is hereinafter to be referred as p2p) stream media technology is exactly wherein a kind of.
In order to guarantee the fail safe of media stream delivery in the p2p stream media system, need the Media Stream that transmit be encrypted.A kind of method to the p2p media stream privacy of the prior art is to use md5-challenge (message-digest algorithm 5 is called for short MD5) to carry out informative abstract, generates check code by informative abstract again.The user obtains check code from server, carries out verification in the downloading process of Media Stream.In actual application, there is following problem at least in this encryption method: if adopt all users all to obtain check code in real time to server, then can bring greater impact to systematic function.If but transmit check code and Media Stream simultaneously from node, father node regenerates check code after can distorting Media Stream, thereby for child node provides different contents, the user can't verify the content of Media Stream according to check code, does not so then reach the purpose that prevents from distorting Media Stream.
At this technical problem, the method that another kind of point-to-point live TV stream transmits in the prior art, this method adopts asymmetric key algorithm, namely the encryption key of an algorithm is not the same with decruption key, can not go out another key by one of them key derivation in other words, wherein be used for encrypted secret key and be called private key, the key that is used for deciphering is called PKI.By privacy key to live TV stream sign the back burst, each client end node carries out signature verification according to server public key to the live TV stream of receiving.Public and private key signature mode can guarantee that Media Stream is not distorted, but this asymmetric enciphering and deciphering algorithm encryption/decryption speed is relatively slow, and is very high to the disposal ability requirement of server system and each client end node.
Summary of the invention
The invention provides a kind of media information sending method, terminal and P2P system, to improve the fail safe that media information sends.
The invention provides a kind of media information sending method, comprising:
Receive the node listing that the P2P server returns according to request of data, described node listing comprises be used to the media information that media information is provided to be provided node and is used for providing the control information of the control information of the described media information of checking that node is provided; Wherein, described media information provide node and described control information provide node for respectively be connected and the mutually different one-level intermediate node of caching server that is used for providing reliable information;
According to the indication of described node listing, provide node and described control information that the described media information of node request and described control information are provided to described media information respectively;
Described media information and described control information that described media information provides node and described control information to provide node to return respectively are provided.
The invention provides a kind of terminal, comprising:
First processing module, be used for receiving the node listing that the P2P server returns according to request of data, described node listing comprises be used to the media information that media information is provided to be provided node and is used for providing the control information of the control information of the described media information of checking that node is provided; Wherein, described media information provide node and described control information provide node for respectively be connected and the mutually different one-level intermediate node of caching server that is used for providing reliable information;
Second processing module is used for the indication according to described node listing, provides node and described control information that the described media information of node request and described control information are provided to described media information respectively;
The 3rd processing module is used for receiving described media information and the described control information that described media information provides node and described control information to provide node to return respectively.
The invention provides a kind of P2P system, comprising: P2P server, caching server, one-level intermediate node, described caching server are connected with described one-level intermediate node with described P2P server respectively, wherein:
Described P2P server is used for according to the tabulation of request of data return node, and described node listing comprises be used to the media information that media information is provided to be provided node and be used for providing the control information of the control information of the described media information of checking that node is provided;
Described caching server is used for providing reliable information to the one-level intermediate node;
Described one-level intermediate node is used for receiving the reliable information that described caching server provides, to provide node as the described media information that described media information is provided or to provide the described control information of described control information that node is provided.
As shown from the above technical solution, media information sending method provided by the invention, terminal and P2P system, provide node and control information to provide node to obtain media information and control information respectively by media information, and media information provide node and control information provide node for be connected and the mutually different one-level intermediate node of caching server that is used for providing reliable information, guaranteed that media information and control information strictness separates, improved the fail safe that media information sends.
Description of drawings
The media information sending method flow chart that Fig. 1 provides for the embodiment of the invention;
The terminal structure schematic diagram that Fig. 2 provides for another embodiment of the present invention;
The P2P system configuration schematic diagram that Fig. 3 provides for yet another embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, below in conjunction with the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described.Need to prove that in accompanying drawing or specification, similar or components identical is all used identical Reference numeral.
The media information sending method flow chart that Fig. 1 provides for the embodiment of the invention one, as shown in Figure 1, this method comprises:
The node listing that step 10, reception P2P server return according to request of data, node listing comprise be used to the media information that media information is provided to be provided node and is used for providing the control information of the control information of checking media information that node is provided; Wherein, media information provide node and control information provide node for respectively be connected and the mutually different one-level intermediate node of caching server that is used for providing reliable information;
Media information and control information that step 30, receiving media information provide node and control information to provide node to return respectively.
The specific implementation process of the media information sending method that present embodiment provides can send request of data to the P2P server for: terminal, and request of data is specially watches request or download request for certain Media Stream fragment.The control information that comprises the media information of this Media Stream fragment and generate according to this media information is stored in the caching server, and caching server directly obtains control information and media information from source server, and caching server is believable resource provisioning server.Caching server sends to coupled a plurality of one-level intermediate node with media information and control information.The P2P server produces node listing according to request of data, and node listing is returned the terminal that sends request of data.Node listing comprises be used to the media information that media information is provided to be provided node and is used for providing the control information of the control information of checking media information that node is provided, it all is the one-level intermediate node that media information provides node and control information that node is provided, though the one-level intermediate node is accepted simultaneously from the media information of caching server and control information, but terminal can only provide node to obtain media information from media information according to node listing, provide node to obtain control information from control information, and it is different one-level intermediate nodes that media information provides node and control information that node is provided, and has guaranteed that the strictness of media information and control information separates.
The media information sending method that present embodiment provides, terminal obtains control information and media information respectively by different one-level intermediate nodes, has guaranteed that the strictness of media information and control information separates, and has improved the fail safe that media information sends.Media information and control information that terminal provides node and control information to provide node to return respectively according to node listing receiving media information, can verify media information by control information, when arbitrary being distorted wherein, the checking result mistake can occur, has improved the fail safe that media information sends with this.On the basis of above-described embodiment, receiving media information provides node and control information to provide after the media information and control information that node returns respectively, specifically may further comprise the steps:
Step 40: whether application controls information is passed through the checking of media information;
Step 50, if application controls information the checking of media information is passed through, then preserve media information;
Step 60, if application controls information the checking of media information is not passed through, then resend request of data to the P2P server, return step 10, receive the node listing that the P2P server resends according to request of data, comprise in the node listing that the media information of redistributing provides node and control information that node is provided.Terminal provides node and control information to provide node to obtain media information and control information from the media information of redistributing again, repeats the above-mentioned course of work.
In the present embodiment, caching server is specifically as follows two, when a caching server breaks down, can use another caching server to work on, and has prevented professional interruption.
In the present embodiment, the source server that is connected with caching server is with the Media Stream generation media information of cutting into slices, generate control information according to media information, and media information and control information corresponding sent to caching server as reliable information, caching server sends to each one-level intermediate node with reliable information.In the practice process, terminal may be the program of newly reaching the standard grade to the media fragment of P2P server request, and be not stored in the caching server, at this moment, after cutting into slices, the Media Stream of the program that source server will newly be reached the standard grade this generates media information, generate control information according to media information, again media information and control information are sent to caching server, provide reliable information for caching server for the one-level intermediate node.
In the present embodiment, control information comprises Media Stream fragment number and the check code of media information correspondence, and check code comprises skew byte, check length, data content and data summarization.Specifically can generate data summarization according to all or part of content of media information by default digest algorithm, terminal begins the skew byte of Media Stream fragment in the media information that receives the data content of check length, generate data summarization by identical digest algorithm, compare with the data summarization in the control information, if both are identical, illustrate that then media information is not distorted, if both differences, media information and control information are described, and one of them is distorted at least, and terminal just can be handled media information according to the checking result.The form of the control information that present embodiment provides is simple, has reduced the requirement to the disposal ability of source server and terminal, has improved the applicability of media information sending method.Certainly, those skilled in the art are according to system safety needs and system processing power, and control information can be other forms, the purpose that media information is verified got final product can realizing, are not limited with present embodiment.
In the present embodiment, if control information provides node to be at least two in the node listing, accordingly, receiving media information provides node and control information that node is provided, and carries out following steps after the media information that returns respectively and the control information:
Step 70, judge whether the identical number of control information in the control informations received, at least two surpasses the half of all received control information quantity;
Know that the identical number of control information in the control informations received, at least two is no more than the half of all received control information quantity if judge, then carry out step 60, resend request of data to the P2P server, return step 10, and receive the node listing that the P2P server resends according to request of data, comprise in the node listing that the media information of redistributing provides node and control information that node is provided;
Know that the identical number of control information in the control informations received, at least two surpasses the half of all received control information quantity if judge, then carry out step 80, this number surpassed the control information of the half of all received control information quantity, as the control information that is used for the checking media information.
In the present embodiment, control information in the node listing provides node to be at least two, can compare control information earlier and judge whether control information is correct, concrete, the identical number of control information is no more than the half of all received control information quantity in control information, then can't differentiate the correctness of control information, then resend request of data to the P2P server this moment, and receive the node listing that the P2P server resends according to request of data, comprise in the node listing that the media information of redistributing provides node and control information that node is provided.The P2P server also can be according to system's setting, only need redefine the content that control information provides node, specifically can also inform the checking situation of P2P server controls information by the mode that sends error reporting to the P2P server, to redefine the foundation that control information provides node as the P2P server.The identical number of control information surpasses the half of all received control information quantity in control information, then this number is surpassed the control information of the half of all received control information quantity, think that namely this control information is correct control information, verifies media information according to this control information again.Those skilled in the art also can come control information is verified by other means, if the safety requirements rank of terminal is made as when higher, then can work as all control informations of obtaining when all identical, just preserve this control information, the method that provides with present embodiment is not limited.
In actual application, the P2P server also can provide node as media information with the terminal of non-one-level intermediate node, terminal can provide the content of node to provide node to obtain media information from media information according to the media information in the node listing, check the correctness of media information by being verified as correct control information again, enlarged the scope that media information obtains.
In the present embodiment, after resending request of data to the P2P server, if judging, the P2P server knows that current the existence can provide the control information of the control information of verifying media information that node is provided as being used for, then will send the terminal of request of data as the one-level intermediate node, and send the reliable information that comprises media information and control information corresponding to terminal by caching server.Terminal as the one-level intermediate node can receive reliable information from caching server, and can provide the reliable information that receives for other-end, has improved the coordinability of P2P system works.
The terminal structure schematic diagram that Fig. 2 provides for another embodiment of the present invention, as shown in Figure 2, this terminal 400 comprises first processing module 401, second processing module 402 and the 3rd processing module 403.First processing module 401 is used for receiving the node listing that the P2P server returns according to request of data, and node listing comprises be used to the media information that media information is provided to be provided node and be used for providing the control information of the control information of checking media information that node is provided; Wherein, media information provide node and control information provide node for respectively be connected and the mutually different one-level intermediate node of caching server that is used for providing reliable information.The indication that second processing module 402 is used for according to node listing provides node and control information that node request media information and control information are provided to media information respectively.Media information and the control information that receiving media information provides node and control information to provide node to return respectively is provided the 3rd processing module 403.The concrete course of work of terminal 400 can send request of data to the P2P server with regard to a certain Media Stream fragment for: terminal 400, can be for watching request or download request, the P2P server generates node listing according to the request of data of terminal 400, and node listing is returned.First processing module 401 of terminal 400 receives the node listing that returns, media information and control information that content requests media information and control information that the media information that second processing module 402 provides according to node listing provides node and control information that node is provided, the 3rd processing module 403 receiving media information provide node and control information to provide node to send.Because media information provides node and control information that node is provided and is different one-level intermediate nodes, can realizes that the strictness of media information and control information separates, improved the fail safe that media information sends.
In the present embodiment, the 3rd processing module 403 specifically can comprise first module 4031 and second unit 4032, and first module 4031 is used for receiving media information and control information, if application controls information is passed through the checking of media information, then preserves media information.Second unit 4032 is used for receiving media information and control information, if application controls information is not passed through the checking of media information, then resend request of data to the P2P server, so that first processing module 401 receives the node listing that the P2P server resends according to request of data, comprise in the node listing that the media information of redistributing provides node and control information that node is provided.
In the present embodiment, control information provides node to be at least two in the node listing, accordingly, terminal 400 can also comprise that manages module 404 everywhere, the manage everywhere module 404 be used for if judge know received, the identical number of control information is no more than the half of all received control information quantity at least two the control information, then resend request of data to the P2P server, so that first processing module 401 receives the node listing that the P2P server resends according to request of data, comprise in the node listing that the media information of redistributing provides node and control information that node is provided; Know that the identical number of control information in the control informations received, at least two surpasses the half of all received control information quantity if judge, then this number is surpassed the control information of the half of all received control information quantity, as the control information that is used for the checking media information.It is example that Fig. 2 provides node and a media information that node is provided with three control informations, manages module 404 everywhere provides node and media information to provide node to obtain control information and media information respectively from control information, if the manages in three control informations that module 404 obtains three or two everywhere when identical, be that identical control information surpasses half, then the control information of this identical control information as the checking media information, and will this identical control information and media information offer the 3rd processing module 403, media information is verified according to control information for the 3rd processing module 403.If the to manage three control informations that module 404 obtains everywhere all different, then identical control information quantity surpasses half, resends request of data to the P2P server.Concrete, can arrange the according to the safety requirements of terminal 400 and manage module 404 everywhere, when required safety requirements was higher, it was whole when identical work as the control information of reception, carries out the checking of media information again, is not limited with present embodiment.
In actual application, also can provide node and control information to provide node to obtain media information and control information respectively from media information by the 3rd processing module 403, the 3rd processing module 403 offers the control information that obtains the again and manages the checking that module 404 is carried out control information everywhere, the manages module 404 everywhere will return to the 3rd processing module 403 by the control information of checking again, media information be verified according to control information for the 3rd processing module 403.The 3rd processing module 403 and is managed module 404 everywhere and can also be wholely set, and manages the purpose that module 404 carries out the checking of control information everywhere by and gets final product to reach, and is not limited with present embodiment.
The P2P system configuration schematic diagram that Fig. 3 provides for yet another embodiment of the invention, as shown in Figure 3, the P2P system 150 that present embodiment provides can be used with the terminal that any embodiment of the present invention provides, this P2P system 150 comprises: P2P server 100, caching server 200, one-level intermediate node 300, caching server 200 is connected with one-level intermediate node 300 with P2P server 100 respectively, wherein, P2P server 100 is used for according to the tabulation of request of data return node, and node listing comprises be used to the media information that media information is provided to be provided node and be used for providing the control information of the control information of checking media information that node is provided.Caching server 200 is used for providing reliable information to one-level intermediate node 300.One-level intermediate node 300 is used for receiving the reliable information that caching server 200 provides, to provide node as the media information that media information is provided or to provide the control information of control information that node is provided.The P2P system 150 that present embodiment provides can realize the media information sending method that any embodiment of the present invention provides.The setting that the P2P system 150 that present embodiment provides provides node and control information that node is provided by media information realizes that the strictness of media information and control information separates, and has improved the fail safe that media information sends.
In the present embodiment, P2P system 150 can also comprise source server 600, source server 600 links to each other with caching server 200, for generation media information that Media Stream is cut into slices, generate control information according to media information, and media information and control information corresponding are sent to caching server 200 as reliable information.
In the present embodiment, preferably, one-level intermediate node 300 is at least two, when one-level intermediate node 300 is two, being respectively media information provides node and control information that node is provided, and terminal can will be verified media information by the control information that receives.When one-level intermediate node 300 when being a plurality of, terminal can provide node to obtain control information from least two control informations, and further control information is compared checking, to determine believable control information.In actual application, P2P server 100 also can provide node as media information with the terminal of non-one-level intermediate node, terminal can provide the content of node to provide node to obtain media information from media information according to the media information in the node listing, check the correctness of media information by being verified as believable control information again, enlarged the scope that media information obtains.Caching server 200 can be two, when one of them caching server 200 breaks down, can prevent service disconnection, improves the stability of P2P system 150.
Media information sending method provided by the invention, terminal and P2P system, provide node and control information that the setting of node is provided by media information, media information and control information strictness is separated, improved the fail safe that media information sends, and control information can realize by better simply cryptographic algorithm, reduce the requirement to the disposal ability of source server and terminal.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a media information sending method is characterized in that, comprising:
Receive the node listing that point-to-point P2P server returns according to request of data, described node listing comprises be used to the media information that media information is provided to be provided node and is used for providing the control information of the control information of the described media information of checking that node is provided; Wherein, described media information provide node and described control information provide node for respectively be connected and the mutually different one-level intermediate node of caching server that is used for providing reliable information;
According to the indication of described node listing, provide node and described control information that the described media information of node request and described control information are provided to described media information respectively;
Described media information and described control information that described media information provides node and described control information to provide node to return respectively are provided;
Wherein, control information described in the described node listing provides node to be at least two, and the described media information of described reception provides node and described control information to provide after the described media information and described control information that node returns respectively:
Know that the identical number of control information in the described control informations received, at least two is no more than the half of all received control information quantity if judge, then resend request of data to described point-to-point P2P server, and receive the node listing that described point-to-point P2P server resends according to described request of data, comprise in the described node listing that the media information of redistributing provides node and control information that node is provided;
Know that the identical number of control information in the described control informations received, at least two surpasses the half of all received control information quantity if judge, then this number is surpassed the control information of the half of all received control information quantity, as the control information that is used for the described media information of checking.
2. media information sending method according to claim 1 is characterized in that, described control information comprises Media Stream fragment number and the check code of described media information correspondence, and described check code comprises skew byte, check length, data content and data summarization.
3. media information sending method according to claim 1 and 2 is characterized in that, described method also comprises:
The source server that is connected with described caching server is cut into slices Media Stream and is generated described media information, generate described control information according to described media information, and described media information and corresponding described control information are sent to described caching server as described reliable information;
Described caching server sends to each described one-level intermediate node with described reliable information.
4. media information sending method according to claim 1 is characterized in that, described method also comprises:
If use described control information the checking of described media information is passed through, then preserved described media information;
If using described control information does not pass through the checking of described media information, then resend request of data to described point-to-point P2P server, and receive the node listing that described point-to-point P2P server resends according to described request of data, comprise in the described node listing that the media information of redistributing provides node and control information that node is provided.
5. media information sending method according to claim 4 is characterized in that, described method also comprises:
After resending request of data to described point-to-point P2P server, if judging, described point-to-point P2P server knows that current the existence can provide the control information of the control information of verifying described media information that node is provided as being used for, then will send the terminal of described request of data as described one-level intermediate node, and send the reliable information of the described control information that comprises described media information and correspondence by described caching server to described terminal.
6. a terminal that is used for obtaining media information is characterized in that, comprising:
First processing module, be used for receiving the node listing that point-to-point P2P server returns according to request of data, described node listing comprises be used to the media information that media information is provided to be provided node and is used for providing the control information of the control information of the described media information of checking that node is provided; Wherein, described media information provide node and described control information provide node for respectively be connected and the mutually different one-level intermediate node of caching server that is used for providing reliable information;
Second processing module is used for the indication according to described node listing, provides node and described control information that the described media information of node request and described control information are provided to described media information respectively;
The 3rd processing module is used for receiving described media information and the described control information that described media information provides node and described control information to provide node to return respectively;
Wherein, control information described in the described node listing provides node to be at least two, and described terminal also comprises:
Manages module everywhere, be used for knowing that the identical number of described control information control informations received, at least two is no more than the half of all received control information quantity if judge, then resend request of data to described point-to-point P2P server, so that described first processing module receives the node listing that described point-to-point P2P server resends according to described request of data, comprise in the described node listing that the media information of redistributing provides node and control information that node is provided;
Know that the identical number of control information in the described control informations received, at least two surpasses the half of all received control information quantity if judge, then this number is surpassed the control information of the half of all received control information quantity, as the control information that is used for the described media information of checking.
7. terminal according to claim 6 is characterized in that, described the 3rd processing module comprises::
First module is used for receiving described media information and described control information, if use described control information the checking of described media information is passed through, and then preserves described media information;
Unit second, be used for receiving described media information and described control information, if using described control information does not pass through the checking of described media information, then resend request of data to described point-to-point P2P server, so that described first processing module receives the node listing that described point-to-point P2P server resends according to described request of data, comprise in the described node listing that the media information of redistributing provides node and control information that node is provided.
8. a point-to-point P2P system is characterized in that comprise: point-to-point P2P server, caching server, one-level intermediate node, described caching server are connected with described one-level intermediate node with described point-to-point P2P server respectively, wherein:
Described point-to-point P2P server is used for according to the tabulation of request of data return node, and described node listing comprises be used to the media information that media information is provided to be provided node and be used for providing the control information of the control information of the described media information of checking that node is provided;
Described caching server is used for providing reliable information to the one-level intermediate node;
Described one-level intermediate node is used for receiving the reliable information that described caching server provides, to provide node as the described media information that described media information is provided or to provide the described control information of described control information that node is provided;
Wherein, control information described in the described node listing provides node to be at least two, it is mutually different one-level intermediate node that described media information provides node and described control information that node is provided, described control information provides node to send at least two described control informations to terminal, described terminal is if judgement is known received, the identical number of control information is no more than the half of all received control information quantity at least two described control informations, then resend request of data to described point-to-point P2P server, and receive the node listing that described point-to-point P2P server resends according to described request of data, comprise in the described node listing that the media information of redistributing provides node and control information that node is provided; If described terminal judge knows that the identical number of control information in the described control informations received, at least two surpasses the half of all received control information quantity, then this number is surpassed the control information of the half of all received control information quantity, as the control information that is used for the described media information of checking.
9. point-to-point P2P according to claim 8 system is characterized in that, also comprises:
Source server, link to each other with described caching server, generate described media information for Media Stream is cut into slices, generate described control information according to described media information, and described media information and corresponding described control information are sent to described caching server as described reliable information.
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