CN102655510B - Application layer multicast system on basis of p-tractert source path discovery technology - Google Patents
Application layer multicast system on basis of p-tractert source path discovery technology Download PDFInfo
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Abstract
The invention relates to an application layer multicast system on the basis of a p-tractert source path discovery technology. The application layer multicast system consists of a multicast server side, a streaming media server and a plurality of client sides, wherein the multicast server side is connected with the streaming media server by virtue of a JAVA API (Application Programming Interface) platform, and the plurality of client sides are connected with the streaming media server by virtue of an Internet network. The application layer multicast system can be used for being conveniently and rapidly deployed in the Internet network, thus providing high-efficiency and high-quality multicast service for a vast number of users, and greatly reducing the time for the users to obtain data on media to be played; and the application layer multicast system reduces the time delay for obtaining node information, effectively improves the construction speed of a multicast tree, and greatly reduces the maintenance cost on the multicast tree.
Description
Technical field
The present invention relates to computer realm, relate in particular to a kind of application layer multicast system based on p-tracert source path discovery technique.
Background technology
Along with the develop rapidly of Internet technology, people receive the mode of information by simple word, audio-frequency information, become the multimedia messages that integrates picture and text, sound, video.Because stream media technology has broken through the restriction of the network bandwidth to multimedia transmission to a certain extent, be therefore widely used in the multiple fields such as live on line, video request program, long-distance education, video conference.Application is exactly the most directly online program request and live at present.
Traditional C/S model, because it is served small scale, server performance dependence by force and needs the defects such as massive band width, the faded out application of Streaming Media. and in P2P system, each peer had both enjoyed service, service is provided again, the burden of server is distributed in each peer, thereby alleviated the load of server and taking of the network bandwidth, improve the autgmentability of system. therefore, the application of P2P technology has become the trend of streaming media live broadcast technology research.Because application layer multicast has easy deployment, the aspect advantage such as customizable, P2P live streaming media service at present has extensively adopted Application layer multicast.But because data in application layer multicast need to be through end system transmission, and end system performance cannot ensure etc. that factor causes the problems such as transmission delay is large, efficiency of transmission is low, and therefore application layer multicast scheme and system are still a popular research field efficiently.
Topology aware application layer multicast is owing to adopting the topology information method of prior end of probe node, make full use of obtained bottom-layer network topology information and construct overlay network, cover network multicasting tree is matched with live network as far as possible, reduce not to be inconsistent because of overlay network and live network the shortest path error of calculation causing, and become a focus of current application layer multicast research.The quality of topology aware application layer multicast performance depends on efficiency and the correctness of obtaining bottom topology information to a great extent, and carries out the number of times of maximum-prefix matching algorithm.The maximum performance bottleneck of existing topological aware application layer multicast scheme is just this.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of application layer multicast system based on p-tracert source path discovery technique, this system can conveniently be disposed in Internet network, for users provide high efficiency, high-quality multicast services, greatly reduce the time that user obtains media data to be played; Reduce nodal information and obtained time delay, effectively improved the structure speed of multicast tree, greatly reduced the maintenance cost of multicast tree simultaneously.
The technical solution adopted in the present invention is: a kind of application layer multicast system based on p-tracert source path discovery technique, it is by multicast server end and streaming media server, and multiple client compositions, multicast server end operates on streaming media server by realizing and dispose on JAVA API platform, process Internet network is to client transmissions data and control information, multiple clients are connected with streaming media server by Internet network and receiving group server end sends data and control information, the request message of client sends to streaming media server by Internet network simultaneously, the request message of the client receiving is passed to multicast server end by streaming media server, multicast server end carries out respective handling and response according to the request message of client,
Described multicast server end adopts p-tracert source path discovery technique, utilizes Real-time Transport Protocol in network, to send in real time stream medium data, builds and safeguard dynamic multicast network topological diagram, controls the network state of whole system;
Described client, for receiving and play stream media data stream, also has the ability of forwarding stream media data flow simultaneously;
Described streaming media server, as high performance server, is accepted the access of client and the distribution of resource;
Described JAVA API platform is by supporting platform independence and fail safe, make JAVA be adapted to network application, JAVA API is the set of Runtime Library, it provides the standard method of a set of access multicast server end, in the system platform of streaming media server, can support before JAVA program, must on this particular platform, realize clearly the function of API.
Press such scheme, described multicast server end comprises: multicast tree control module, streaming media module, document management module, capture device module, the direction of multicast tree control module control streaming media module transmitting data stream, streaming media module is obtained data source and is converted into audio/video flow to client transmissions data from document management module or equipment trapping module;
Described multicast tree control module has been implanted p-tracert source path discovery technique, be mainly used in controlling the multicast topology structure of whole system, be responsible for foundation and the maintenance of multicast tree, control adding and exiting of client node, and the message transmitting between processing node, construct and safeguard multicast transmit tree, control reception and the forwarding of the data of streaming media module;
Described streaming media module is for client (child node) the transmission of media data stream to its forwarding data of request;
Described document management module can supply the data source of transmission and the real time data source that capture device module is caught in a large number for managing multicast server end;
Described capture device module, for the form of capture device capture-data is set, adapts to different demands by different parameters is set.
Press such scheme, described multicast server end also comprises for monitoring multicast server end memory behaviour in service the internal memory monitoring module showing with the formal intuition of scheming.
Press such scheme, described client comprises local file playing module, live streaming media module, streaming media on demand module, receives forwarding control module and client media player, after audio stream and video flowing that described reception forwarding control module reception Internet Internet Transmission is come, pass to streaming media on demand module through merging data source, described local file playing module, live streaming media module and streaming media on demand module by audio stream and video streaming to client media player; Streaming media on demand module and live streaming media module are merged into data source of stream media and are called broadcastings of decode of client media player forward the audio/video flow coming from other client hosts or streaming media server, and local file playing module is according to user's request call client media player corresponding media data source of broadcasting of decoding;
The media play interface that described local file playing module provides by JMF framework in Java is play local media file;
Described streaming media on demand module is for receiving the some broadcasting flow-medium data sending from multicast server end, and the broadcasting of decoding;
Described live streaming media module has been added stream medium data forwarding capability, and receives the live broadcast stream media data that send to client or the multicast server end (father node) of its forwarding data, the broadcasting of decoding.
Press such scheme, described p-tracert source path discovery technique comprises:
(1) send the ICMP echo request message of many different ttl values simultaneously, and only send out a message for each different TTL;
(2) judge that according to the value of the Identify field in the overtime response message of ICMP and Sequence Number field overtime response message is the response to which ttl value;
(3) constantly revise once concurrent icmp packet number according to the mean value of the node jumping figure having detected, so that reach the income of maximal degree and the balance of cost;
In multicast tree control module, implant p-tracert source path discovery technique, carry out Topology Discovery by above (1)-(3) step, the final topology information of determining from source node to destination node of surveying, topology information will be associated with destination node, be stored in the details list of destination node, multicast tree control module, according to this topology information, is carried out the topological structure of multicast tree, and then controls the forwarding of data.
Press such scheme, described multicast tree control module also adopts p-tracert maintenance of information strategy technology, and this p-tracert maintenance of information strategy technology utilization is recorded degree of aging and data upgraded and deleted, and specifically comprises:
(1) be r to adding the detection of a target in multicast tree
ip-tracert path new record time, it is 0 that degree of aging initial value is set, i.e. aging (r
i)=0;
(2) according to AP digestion period (Aging Period) arranging, in an AP cycle of every mistake, degree of aging adds 1 automatically, i.e. aging (r
i)=aging (r
i)+1;
(3) if certain p-tracert record reaches aging threshold value A T (Aging Threshold), check the detection of a target r of this node
kclient node set V (r in gateway-level topological diagram T
k) be whether
if V is (r
k) do not exist or
this record is deleted, otherwise the r of detection of a target node again
kpath and delayed data, upgrade multicast tree, and the aging (r that resets
k)=0.
Press such scheme, in described multicast tree, adopted maximum-prefix Path Matching Algorithm adding of node, maximum-prefix Path Matching Algorithm is to carry out binary digit according to the IP address of node to be added with the node IP address in multicast node to mate successively from a high position to low level, selects the node of prefix matching degree maximum to add multicast tree as the father node application of node to be added.
In the present invention, the feature of p-tracert is:
(1) can send the ICMP echo request message of many different ttl values simultaneously;
(2) can judge that overtime response message is the response to which ttl value according to the value of the Identify field in the overtime response message of ICMP and Sequence Number field, and have nothing to do with the order that overtime response message arrives;
(3) can constantly revise once concurrent icmp packet number according to the mean value of the node jumping figure having detected, so that reach the income of maximal degree and the balance of cost;
(4) p-tracert only sends out a message for each different TTL, if do not receive the timeout packet that this TTL is corresponding in official hour, send once more identical message, if also do not obtain timeout packet, used special address (255.255.255.255) to replace, represented that this address is not true address; In addition, source node does not need to send the ICMP echo request message of TTL=1, replaces the destination address of message with the gateway address of destination node simultaneously, thereby has further reduced the message number that sends and respond.
The present invention is from multicast server end to client, carry out Modularity analysis design according to functional, make intermodule there is high cohesion and low coupling, use based on p-tracert source path discovery technique, make the multicast network topological structure of structure be similar to actual physics topological structure, make the transmission delay of data shorter, greatly improved the quality of multicast services.Use the maintenance of information strategy of p-tracert that the robustness of multicast tree is strengthened.By above innovative approach, ensure that whole system provides the reliability of high efficiency and high-quality service for user.Experimental verification has shown that the indices such as efficiency and the robustness of multicast tree of data transmission delay between node, entire system data transmission delay, multicast tree structure all reaches expected results.
Brief description of the drawings
Fig. 1 is the application layer multicast system general frame figure based on p-tracert source path discovery technique.
Fig. 2 is server end Streaming Media transmission flow.
Fig. 3 is the Message Processing flow process of multicast tree control module.
Embodiment
Further illustrate embodiments of the invention below in conjunction with accompanying drawing.
Referring to Fig. 1, the technical solution adopted in the present invention is: a kind of application layer multicast system based on p-tracert source path discovery technique, it is by multicast server end and streaming media server, and multiple client compositions, multicast server end operates on streaming media server by realizing and dispose on JAVA API platform, pass through Internet network to client transmissions data and control information by streaming media server, multiple clients are connected with streaming media server by Internet network and receiving group server end sends data and control information, the request message of client sends to streaming media server by Internet network simultaneously, the request message of the client receiving is passed to multicast server end by streaming media server, multicast server end carries out respective handling and response according to the request message of client.Described multicast server end adopts streaming protocol (Real-time Transport Protocol) that audio-video document is transferred to client, watch online for user, the topological sensor coverage network that structure and maintain customer node form, control the network state of whole system, the structure of overlay network is according to the information of obtaining based on p-tracert path.Described client is mainly used in receiving and play stream media data stream, also has the ability that copies forwarding media data simultaneously.Client can offer user-friendly operation interface, and user's operational order is sent to multicast server end; And monitor multicast server end and broadcast the control command of coming, control command is made to response, realize the simultaneous operation between multicast server end and multiple client, client background receives the stream medium data that other client on Internet network or streaming media server send in real time, and to its playback or copy and be transmitted to other client of decoding.
Described multicast server end comprises: multicast tree control module, streaming media module, document management module, capture device module and internal memory monitoring module, the direction of the transmitting data stream of multicast tree control module control streaming media module, streaming media module is obtained data source and is converted into audio/video flow to client transmissions data from document management module or equipment trapping module, described multicast tree control module sends to control by transmission with streaming media module and is connected with JAVA API platform, described capture device module is connected with JAVA API platform by document management module, described internal memory monitoring module is connected with JAVA API platform, described JAVA API platform is connected with streaming media server, described streaming media server by streaming protocol to Internet Internet Transmission audio stream and video flowing.
Described multicast tree control module is a module the most key in native system, be mainly used in controlling the multicast topology structure of whole system, be responsible for foundation and the maintenance of multicast tree, control adding and exiting of client node, and the message transmitting between processing node, construct and safeguard multicast transmit tree, control reception and the forwarding of media data.Implanted p-tracert source path discovery technique in multicast tree control module, p-tracert source path discovery technique is proved more traditional tracert order less detection time delay, and consuming time less, efficiency is higher.The adding and exit of multicast tree control module major control node, fashionablely first send and join request to multicast server end node when there being new node to add, multicast server end node receive after the request that client node sends can according to draft add multicast tree Constructing Policy time node join and in multicast tree, accept the data, services that father node provides to it.When there being exiting of node, first can send the message of upgrading multicast tree to multicast server end, multicast server end receives that can will leave node after message deletes from multicast tree, then leave node and can send leave message to all adjacent nodes, the father node of this node and child node all can be received the leave message of leaving node, father node will be concentrated its child node from oneself to delete, and child node will be found new father node again.
The difference of order program service and multicast services maximum is that multicast services need to call multicast tree control module.Multicast tree control module is the application layer multicast tree that each one of live source establishment forwards this live data streams, and therefore this module is mainly divided into multicast tree structure, multicast tree maintenance, 3 parts of multicast tree displaying.In multicast tree structure link, the present invention has utilized p-tracert source path discovery technique to construct topological diagram, the not only required topology information of simplified construction topological diagram, and can accelerate to obtain the speed of topology information, thereby shorten the time that topological aware application layer multicast node adds multicast tree, for user provides higher service quality.In described multicast tree, adopted maximum-prefix Path Matching Algorithm adding of node, maximum-prefix Path Matching Algorithm is to carry out binary digit according to the IP address of node to be added with the node IP address in multicast node to mate successively from a high position to low level, selects the node of prefix matching degree maximum to add multicast tree as the father node application of node to be added.Safeguard that in multicast tree in link, system has been used p-tracer maintenance of information strategy, not only the happen suddenly situation of leaving but also the maintenance efficiency that has improved multicast tree of processing node.Show in link in multicast tree, multicast server end can go out current network according to the multicast information of client feedback dynamic drafting on multicast server end interface in multicast tree topological diagram.
Described streaming media module sends corresponding stream medium data (for to child node transmission of media data stream) according to control information to the request msg node that newly adds multicast tree; Streaming media module combines with multicast tree control module and makes media data be able to correct execution from multicast server end to the whole transmitting procedure of client.
Described document management module can supply the data source of transmission and the real time data source that capture device module is caught in a large number for managing multicast server end; Wherein real time data source is to obtain by relevant audio frequency and video the audio and video data streams that equipment (as: camera, microphone etc.) is caught.These equipment carry out control and management by capture device administration module, different parameters can be set as required and meet the requirement in output sound video format parameter, so that real-time stream can better be received and process by client player.The information of described document management module management comprises the title of data source and the path of data source storage, and wherein the title of data source is the media name in the list of client online Media.The information of document management module management is stored in MySq1 according in storehouse.Because native system, except having local broadcasting media file function, also provides video request program and net cast two to serve greatly to user, therefore document management module comprises program request file management and live file management.Document management module provides the additions and deletions of database has been changed to visualized operation.
Described capture device module, for the form of capture device capture-data is set, adapts to different demands by different parameters is set.For example: if network condition is good, can be by the video frame rate of catching, the corresponding rise of size, to ensure better image quality; Otherwise, video frame rate, size can be lowered a little, with the fluency that ensures to play.If want to preserve certain parameter combinations, can use preservation form button to preserve current capture device parameter to local disk.In the time that start server next time, the parameter of capture device can become last parameter of preserving by Lookup protocol like this.
Described internal memory monitoring module is relatively independent at multicast server end, and it belongs to a supplementary module, for detection of the internal memory behaviour in service of multicast server end, and shows the overall load pressure of understanding system for back-stage management person with the form of icon.
Described client comprises local file playing module, live streaming media module, streaming media on demand module, receives forwarding control module and client media player, described reception forwards control module and receives audio stream and the video flowing that Internet Internet Transmission is come, then pass to streaming media on demand module through merging data source, described local file playing module, live streaming media module and streaming media on demand module by audio stream and video streaming to client media player;
The media renderer plays local media file that described local file playing module utilizes the JMF framework in Java to provide, in JMF, the broadcasting of Media Stream is that the method providing by Controller interface realizes.Controller has defined basic controlling mechanism and has caught Media Stream, has also defined media Controller simultaneously and has processed each stage of the required experience of Media Stream and the interaction mechanism in each stage.In media play process, can switch by a series of state of experience, each state can trigger corresponding event while switching.User can carry out capture events and process accordingly by realizing ControllerListener interface.Described local file playing module is for the media data file of the storage on client end of playing back main frame (subscriber's main station), user can independence selection media file play or join the playlist of player, the control of simultaneously playing process being correlated with.
Described streaming media on demand module is positioned on client host, it is for sending message to the request in reference point multicast data source to multicast server end according to user, multicast server termination is done the corresponding request msg of meeting preparation after receiving message, send control module by transmission and send media data flow to client, this media data flow comprises audio stream and video flowing, after client, first can merge data source, be play by the decoding of client DST PLAYER.The workflow of this streaming media on demand module is as follows:
(1) resolve RTP session character string array, initialization RTP manager array, structure management broadcast window, prepare for receiving also play stream media data;
(2) data monitors that add session monitor, receive etc., monitor stream medium data;
(3), if there are stream media information data to arrive, data stream received, obtains RTP and control and resolve the form that receives data;
(4) by the data source receiving, construct a DST PLAYER, thereby play;
(5) if stream medium data receives, close the broadcasting of broadcast window, termination stream medium data, keep listening state simultaneously, prepare at any time the stream medium data of response server transmission.
Described live streaming media module is in client host, with streaming media on demand module, in function, some is close, but it than streaming media on demand module many function of transmitting data flow, in the time of user's acquisition request live data source, the message adding to the application of multicast server end sending node, the multicast tree control module of multicast server end can receive corresponding message and control adding implantation site and exiting of node, after node adds multicast tree, can send message request data source to its father node, father node will forward corresponding real-time stream to it.The father node that in live streaming media module, node obtains data is no longer unified is multicast server end node, and client node also can be used as father node to its child node forwarding data.
In multicast tree control module workflow, the feature of p-tracert source path discovery technique is:
P-tracert source path discovery technique is that the one of windows series operating system tracert mechanism is improved mechanism, and is concurrent tracert mechanism.The maximum feature of p-tracert is that it can send the ICMP echo request message of many different ttl values simultaneously.Because the value of the Identify field in the overtime response message of ICMP and Sequence Number field is with identical by the value of response message corresponding field, therefore p-tracert can judge that overtime response message is the response to which ttl value according to these two field values, and has nothing to do with the order that overtime response message arrives.
P-tracert once concurrent icmp packet number also has a certain impact to its performance.Number is too little, could arrive destination through repeatedly concurrent, has lost concurrent advantage; Number is too large, can produce again too much redundant message, the waste transmission resource of source node and the reception resource of destination node.For this reason, we constantly revise once concurrent icmp packet number of p-tracert according to the mean value of the node jumping figure having detected, so that it reaches the balance of income and cost as far as possible.
P-tracert only sends out a message for each different TTL, if do not receive the timeout packet that this TTL is corresponding in official hour, send once more identical message, if also do not obtain timeout packet, used special address (255.255.255.255) to replace, represented that this address is not true address.In addition, because source node can directly obtain oneself gateway address, and the gateway address of destination node has also sent to source node in the time that application adds multicast tree, therefore source node does not need to send the ICMP echo request message of TTL=1, replace the destination address of message simultaneously with the gateway address of destination node, thereby further reduced the message number that sends and respond.
According to experimental analysis and checking, be taken at and use the identical destination address obtaining with the tracert order of parameter with p-tracert, performance is greatly improved.
In multicast tree control module workflow, the concrete grammar of p-tracert maintenance of information strategy is as follows:
P-tracert path topology information and delay data thereof are kept at the database for storing multicast tree node information.In to the maintenance process of multicast tree, the p-tracert path topology that multicast server end node and each client node maintain and delayed data can be constantly aging, upgrading or delete according to aging degree of aging (aging degree), is r for the detection of a target
ithe degree of aging of p-tracert routing information, with aging (r
i) represent, the maintenance of information function of multicast tree control module can according to following steps to system node information upgrade and delete:
(1) be r to adding the detection of a target in multicast tree
ip-tracert path new record time, it is 0 that degree of aging initial value is set, i.e. aging (r
i)=0;
(2) according to AP digestion period (Aging Period) arranging, in an AP cycle of every mistake, degree of aging adds 1 automatically, i.e. aging (r
i)=aging (r
i)+1;
(3) if certain p-tracert record reaches aging threshold value A T (Aging Threshold), check the detection of a target r of this node
kclient node set V (r in gateway-level topological diagram T
k) be whether
if V is (r
k) do not exist or
this record is deleted, otherwise the r of detection of a target node again
kpath and delayed data, upgrade multicast tree, and the aging (r that resets
k)=0.
Above-mentioned utilization is recorded degree of aging and data is upgraded and deleted, and both can delete the routing information of outmoded and little use, can upgrade within a certain period of time again the topology information relevant to multicast tree, to adapt to the dynamic of network.
The Streaming Media transmission flow of native system multicast server end as shown in Figure 2, this process is to complete by streaming media module, first obtain data source from capture device or media file and carry out instantiation, the processor that can utilize the JMF platform of Java to provide after instantiation data source is provided and changes into the data source of stream media that can transmit at Internet net, and it is carried out to code division become audio stream and video flowing, finally send to object client by Internet net, client is to the operation that can carry out relative decoding and merging data source after corresponding data flow, finally realize from request msg source to the whole flow process of playing media data.
Fig. 3 is the Message Processing flow process of multicast tree control module, the request that after multicast server end program starts, whether its meeting real-time listening has client to send, when multicast server termination is received after the request that client sends, first judge request type, if acquisition point multicast data source, the data that sent request to client by streaming media module; If live data source, transferring to multicast tree control module processes, multicast tree control module determines that request adds adding behind implantation site by client father node to its forwarding media data flow of ingress, and multicast tree control module can be upgraded the multicast transmit tree of its maintenance simultaneously.
The invention discloses a kind of application layer multicast system based on p-tracert source path discovery technique, this system can conveniently be disposed in Internet network, for users provide high efficiency, high-quality multicast services, greatly reduce the time that user obtains media data to be played; This system has adopted p-tracert maintenance of information strategy to carry out real-time update and has safeguarded the nodal information of multicast tree, so that node add and exit process in make the adjustment Least-cost of multicast tree, so just shorten the buffer time of exiting the client media player causing because of node, thereby made user's stand-by period shorter; This system has accelerated to obtain the speed of topology information, shorten the time that topological aware application layer multicast node adds multicast tree, reduce nodal information and obtained time delay, effectively improve the structure speed of multicast tree, greatly reduce the maintenance cost of multicast tree, for user provides higher service quality.
Show that by experiment native system has multicast and builds efficient and the high-quality feature of streaming media playing.
Definition used in the present invention:
1, application layer multicast be by copying in application layer, buffer memory and forwarding data bag realize the transmission of stream medium data in network, copies with forwarding data bag differently from traditional IP multicast on router, it has avoided IP to be difficult to the problem of disposing;
2, p-tracert source path discovery technique is that the one of windows series operating system tracert mechanism is improved mechanism, and it can walk abreast simultaneously and send the echo request message of many different ttl values;
3, application layer multicast is set also referred to as distribution tree, it be by multicast source transfer of data on child node, then copy and be transmitted to other end node, the path that this process forms by this node;
4, the application layer multicast system based on p-tracert source path discovery technique is that application layer multicast system has adopted p-tracert source path discovery technique in the construction process of multicast tree, and server can be faster provides high-quality service for client host.
The above; be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification; equivalent variations or modification, all drop in protection scope of the present invention.
Claims (6)
- One kind based on p-tracertthe application layer multicast system of source path discovery technique, it is characterized in that: it is by multicast server end and streaming media server, and multiple client compositions, multicast server end operates on streaming media server by realizing and dispose on JAVA API platform, pass through Internet network to client transmissions data and control information, multiple clients are connected with streaming media server by Internet network and receiving group server end sends data and control information; The request message of client sends to streaming media server by Internet network simultaneously; the request message of the client receiving is passed to multicast server end by streaming media server, and multicast server end carries out respective handling and response according to the request message of client;Described multicast server end comprises: multicast tree control module, streaming media module, document management module, capture device module, the direction of the transmitting data stream of described multicast tree control module control streaming media module, streaming media module is obtained data source and is converted into the reception forwarding control module transmission data of audio/video flow to client from document management module or equipment trapping module;Described multicast tree control module has been implanted p-tracertsource path discovery technique, be mainly used in controlling the multicast topology structure of whole system, be responsible for foundation and the maintenance of multicast tree, control adding and exiting of client node, and the message transmitting between processing node, construct and safeguard multicast transmit tree, control reception and the forwarding of the data of streaming media module;Described streaming media module is for the client transmissions media data flow to its forwarding data of request;Described document management module can supply the data source of transmission and the real time data source that capture device module is caught in a large number for managing multicast server end;Described capture device module, for the form of capture device capture-data is set, adapts to the demand of different user by different parameters is set.
- As claimed in claim 1 based on p-tracertthe application layer multicast system of source path discovery technique, is characterized in that: described multicast server end also comprises for monitoring multicast server end memory behaviour in service the internal memory monitoring module showing with the formal intuition of scheming.
- As claimed in claim 1 based on p-tracertthe application layer multicast system of source path discovery technique, it is characterized in that: described client comprises local file playing module, live streaming media module, streaming media on demand module, receive and forward control module and client media player, after audio stream and video flowing that described reception forwarding control module reception Internet Internet Transmission is come, behind merging data source, pass to streaming media on demand module, described local file playing module, live streaming media module and streaming media on demand module are merged into data source of stream media by audio stream and video flowing and are transferred on client media player,The media play interface that described local file playing module provides by JMF framework in Java is play local media file;Described streaming media on demand module is for receiving the some broadcasting flow-medium data sending from multicast server end, and the broadcasting of decoding;Described live streaming media module has been added forwarding media stream function, and receives the live broadcast stream media data that send to client or the multicast server end of its forwarding data, the broadcasting of decoding.
- As claimed in claim 1 based on p-tracertthe application layer multicast system of source path discovery technique, is characterized in that: described p-tracertsource path discovery technique comprises:(1) send the ICMP of many different ttl values simultaneously echo requestmessage, and only send out a message for each different TTL;(2) according in the overtime response message of ICMP identifyfield and sequence Numberthe value of field judges that overtime response message is the response to which ttl value;(3) constantly revise once concurrent icmp packet number according to the mean value of the node jumping figure having detected, so that reach the income of maximal degree and the balance of cost.
- As claimed in claim 1 based on p-tracertthe application layer multicast system of source path discovery technique, is characterized in that: described multicast tree control module also adopts p-tracertmaintenance of information strategy technology, should p-tracertthe utilization of maintenance of information strategy technology is recorded degree of aging and data is upgraded and deleted, and specifically comprises:(1) to adding the detection of a target in multicast tree be r i 's p-tracertwhen path new record, degree of aging initial value is set is 0, aging (r i )=0;(2) according to the digestion period arranging aP( aging Period), one of every mistake aPin the cycle, degree of aging adds automatically 1, aging (r i )=aging (r i )+1;(3) if certain p-tracertrecord reaches aging threshold value aT( aging Threshold), check the detection of a target of this node r k at gateway-level topological diagram tin client node set v( r k ) be whether ;if v( r k ) do not exist or v( r k )= ?, this record is deleted, otherwise detection of a target node again r k path and delayed data, upgrade multicast tree, and reset aging (r k )=0.
- As claimed in claim 5 based on p-tracertthe application layer multicast system of source path discovery technique, it is characterized in that: in described multicast tree, adopted maximum-prefix Path Matching Algorithm adding of node, maximum-prefix Path Matching Algorithm is to carry out binary digit according to the IP address of node to be added with the node IP address in multicast node to mate successively from a high position to low level, selects the node of prefix matching degree maximum to add multicast tree as the father node application of node to be added.
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