CN109743594A - The sharing method extracted in wireless video shared system based on similar play mode - Google Patents
The sharing method extracted in wireless video shared system based on similar play mode Download PDFInfo
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Abstract
The sharing method extracted in wireless video shared system based on similar play mode, comprising: S1, video server change level of interest of the behavior sensing node to video content of video playing point according to node；S2, video server extract several play mode according to level of interest of all nodes to same video content, and are clustered according to play mode to all nodes, obtain the conjunction of several Node subsets；S3, video server specify a head node in the conjunction of each Node subsets, and head node is responsible for safeguarding that affiliated Node subsets close the state change behavior of interior other nodes and caching resource information, all head nodes safeguard that the video between all nodes shares behavior jointly；S4, system is added for video server maintenance new node or node logs off；S5, video server perception new node actively change the behavior that affiliated Node subsets close.The present invention can effectively improve the efficiency that video resource is shared between node, promote user experience.
Description
Technical field
The present invention relates to video resource technology of sharing field, phase is based in specifically a kind of wireless video shared system
The sharing method extracted like play mode.
Background technique
Video service is provided to hold the user of intelligent handheld device in the wireless network, can be seen anywhere or anytime
See that video content is of great significance.It is predicted according to Cisco System Co., arrive the year two thousand twenty, video data flow will occupy the mobile stream in the whole world
2/3rds of amount.This is because Video service can provide content viewable abundant for user, to attract a large amount of view
Frequency user produces the video flow of great scale.End in December, 2017, Chinese network video user has reached
5.79 hundred million people, and frequency of use has reached 75%.The deployment of extensive video system will face service quality and expansible
The problem of property.When number of users contained in video system is larger and sharply increases, video system needs to provide for user
Sufficient bandwidth resources, and the start-up study of user is minimized, promote the Quality of experience of user.However, video server is limited
Bandwidth resources be difficult to meet the bandwidth demand of mass users generation and reduce system so as to cause longer user's start-up study
Service quality and scalability.The number of servers for increasing deployment is needed to increase based on the video system of content distributed network
The bandwidth of video system supplies, but relative to huge userbase, increased bandwidth supply is also unable to satisfy huge size
Bandwidth demand, and the increase of number of servers also brings higher deployment cost.
P2P technology calculates using client is remaining, stores and realize the shared of resource between client bandwidth resources, greatly
Ground improves the supply capacity of video system entirety resource, to promote the service ability and scalability of video system.In recent years
Come, numerous scholars propose the dispositions method of many video-on-demand services based on P2P.For example, BBTU is by the node in network
Tissue is become a binary tree structure and is devised using advantage of the binary tree structure in resource searching performance based on binary tree
Video resource caching and searching method and based on the video searching method to flood, thus promoted video resource search performance and
Resource query success rate.VMesh utilizes a distributed hashtable by the node organization in network into a DHT structure, benefit
With advantage of the DHT structure in resource searching performance, the efficiency of video search is promoted.VMesh further provides one and is based on
The expansion structure of chained list, i.e. each node in DHT structure cache the forerunner of current video block and the section of subsequent video blocks
Point chained list, to promote the resource searching performance when fast forwarding and fast rewinding operation for executing video-on-demand service.In addition, VMesh is defined
The method of a cycle maintenance DHT structure, by between adjacent node period exchange present node status message in the way of tie up
Protect entire DHT structure.SURFNet divides video into superblock and conventional bar two types, and superblock is several common views
The set of frequency block.The line duration long time possesses stable broadcasting behavior in SURFNet default network, therefore caches super
Block, the relatively short nodal cache conventional bar of line duration.The node organization for storing superblock becomes an Adelson-Velskii-Landis tree, utilizes AVL
Tree construction realizes efficient video search.Secondly, SURFNet is by storage conventional bar and conventional bar belongs to the node of same superblock
A chained list is constituted, is attached on the Adelson-Velskii-Landis tree interior joint of storage superblock, so that an Adelson-Velskii-Landis tree structure based on chained list is formed,
Video search performance is further promoted with this.Above method is by the node organization in network to a tree-like or DHT structure
In, although higher search performance can be obtained, with quickling increase for nodes quantity, and node state constantly becomes
Change, so as to cause safeguarding that tree-like or DHT structure cost constantly increases, consumes a large amount of network node bandwidth, seriously affects and be
The scalability of system.Node maintenance several neighbor nodes in network are required based on non-structured video sharing method, and
Video is carried out with neighbor node to share, if neighbor node is unable to satisfy mutual video requirement, needs to search using the method for flooding
Rope video.The searching method that floods to consume a large amount of network bandwidth, and is seriously affected video and asked by broadcast request message
Seek the start-up study of node.
Summary of the invention
In order to solve deficiency in the prior art, the present invention is provided in a kind of wireless video shared system based on similar broadcasting
The sharing method of pattern extraction can effectively improve the efficiency for sharing video resource between node, promote user experience.
To achieve the goals above, the present invention use the specific scheme is that being broadcast in wireless video shared system based on similar
The sharing method that mode playback extracts, the wireless video shared system includes video server and several are logical with video server
Believe that the node of connection, video server store all video resources in wireless video shared system, the sharing method packet
Include following steps:
S1, video server change level of interest of the behavior sensing node to video content of video playing point according to node；
S2, video server extract several play mode according to level of interest of all nodes to same video content, and
All nodes are clustered according to play mode, obtain the conjunction of several Node subsets；
S3, video server specify a head node in the conjunction of each Node subsets, and head node is responsible for safeguarding affiliated Node subsets
The state change behavior of other nodes and caching resource information, all head nodes safeguard the video between all nodes jointly in closing
Shared behavior；
S4, system is added for video server maintenance new node or node logs off；
S5, video server perception new node actively change the behavior that affiliated Node subsets close.
The specific method of S1 includes:
One video is evenly divided into several continuous video blocks by S1.1, video server, and successively to all video blocks
Number；
The behavior description that node changes video playing point is video block jump procedure by S1.2, video server；
The video block jump procedure that S1.3, video server generate when node is played video is integrated into a broadcasting record, broadcasts
It puts record and node and video corresponds；
S1.4, video server calculate in the video between video block according to the broadcasting record that all nodes play same video
Correlation degree；
S1.5, video server are according to the correlation degree calculate node in video between video block to the level of interest of video.
The specific method of S1.4 includes:
S1.41, video server, which obtain, to be jumped between two target video blocks when all nodes play same video
Target frequency；
S1.42, video server, which obtain, to be jumped between any two video block when all nodes play same video
Frequency summation；
S1.43, video server calculate the ratio of target frequency and frequency summation, are recorded as the pass between two target video blocks
Connection degree；
S1.44, S1.41 to S1.43 is repeated until calculating the correlation degree between any two video block.
The specific method of S1.5 includes:
S1.51, video server extract all video block jump procedures from the broadcasting record that node plays a video；
S1.52, video server calculate the interest value of all video block jump procedures；
S1.53, video server sum to the interest value of all video block jump procedures, obtain node to the interest journey of video
Degree.
The specific method of S2 includes:
Level of interest of all nodes to same video is built into an interest-degree set by S2.1, video server；
S2.2, video server remove highest level of interest from interest-degree set, and highest level of interest is corresponding
The broadcasting record of node is defined as a play mode；
The interest that S2.3, video server calculate in interest-degree set between remaining level of interest and highest level of interest is similar
Degree, and the broadcasting participated between node corresponding to two level of interest that Interest Similarity calculates record similarity；
S2.4, video server according to Interest Similarity and play record similarity judge two nodes broadcasting behavior whether phase
Seemingly；
Node corresponding with highest level of interest there are all nodes of similar broadcasting behavior to map by S2.5, video server
Into the play mode of S2.2；
S2.6, video server repeat S2.2 to S2.5, until number of elements contained in interest-degree set be 0, finally will
For all node clusterings into several play mode, each play mode corresponds to one or more node.
The specific method of S2.3 includes:
S2.31, video server calculate the ratio of remaining level of interest and highest level of interest in interest-degree set, are denoted as emerging
Interesting similarity；
The broadcasting record of node is converted into string of binary characters, the length and view of string of binary characters by S2.32, video server
The quantity of video block is equal in frequency, and playing the corresponding binary-coded character of video block present in record is 1, plays and does not deposit in record
It is 0 in the corresponding binary-coded character of video block；
S2.33, video server calculate the Hamming distance between two strings of binary characters, then by the length of string of binary characters
The difference of degree and Hamming distance is as molecule, and using the length of string of binary characters as denominator, obtained ratio is denoted as broadcasting note
Record similarity.
The specific method of S2.4 includes:
S2.41, video server calculate the mean value of all level of interest in interest-degree set；
S2.42, in interest-degree set in remaining all level of interest, when level of interest is greater than mean value, and the interest journey
When the broadcasting record similarity spent between corresponding node and highest level of interest corresponding node is greater than Interest Similarity, determine that this is broadcast
It is similar to the broadcasting behavior of highest level of interest corresponding node to put record corresponding node.
In S3, while video server specifies head node in the conjunction of each Node subsets, one or more is also specified
Candidate head node, when head node, which exits Node subsets, to be closed, candidate head node becomes new head node；
The method of the state change behavior of other nodes includes: in Node subsets conjunction belonging to head node maintenance
The Node subsets that S3.11, head node receive other nodes in the conjunction of affiliated Node subsets close change request, node
Set change request includes new node subclass information and change requesting node information；
S3.12, head node will change requesting node and delete from the conjunction of affiliated Node subsets；
Node subsets are closed the head node that change request is forwarded to new node subclass by S3.13, head node；
The head node receiving node subclass change request of S3.14, new node subclass, and change requesting node is added to institute
Belong in Node subsets conjunction；
All head nodes safeguard jointly the video between node share behavior method include:
S3.21, head node receive from affiliated Node subsets close in other nodes video request message or from other heads
The video request message that node forwarding comes, video request message include request video block message；
S3.22, head node according to request video block message from affiliated Node subsets close in all nodal caches video block in into
The information that the video for being cached with request video block provides node is returned to requesting node if successful inquiring, asked by row inquiry
It asks node and responsive node to establish connection progress video to share, returns to failed message to requesting node if inquiring failure.
The specific method of S4 includes:
Video sharing system is added in S4.A, new node, and specific method includes S4.A1 to S4.A5；
S4.A1, video server receive the addition request message of new node, and it includes new node information, request that solicited message, which is added,
The buffered video list of video information and new node, then new node is added in node listing by video server, and will
The information of play mode list and all head nodes is sent to new node；
S4.A2, new node are broadcasted to all head nodes is added request message, and receives the successful inquiring message from head node
Or inquiry failed message, successful inquiring information include video vendor ID；
S4.A3, new node terminate reception after receiving first successful inquiring message, abandon subsequent all successful inquirings
Message or inquiry failed message；
S4.A4, new node according in first successful inquiring message video vendor ID and video vendor establish connection, connect
Receive the request video sent from video vendor；
S4.A5, video server set the play mode of video vendor to the default play mode of new node, and will be new
Node is added to during the Node subsets where video vendor close；
S4.B, node exit video sharing system, and specific method exits request message for video server receiving node, exits
Request message includes all broadcasting records of the node.
The specific method of S5 includes:
S5.1, new node calculate itself search failure rate in the conjunction of affiliated Node subsets；
S5.2, new node obtain the average search failure rate that affiliated Node subsets close interior all nodes from head node；
Itself search failure rate is compared by S5.3, new node with average search failure rate, if itself search failure rate is big
In average search failure rate, then S5.4 is carried out, if itself search failure rate is less than average search failure rate, stopped；
S5.4, new node calculate itself and play the matching degree of record with all play mode, and select from all play mode
It takes and itself plays the highest play mode of record matching degree as new play mode；
S5.5, new node are transferred in the conjunction of Node subsets corresponding to new play mode.
The utility model has the advantages that
1, the present invention is operated every time by skip operation frequency estimation user of the investigation user between video block and reflects two views
Correlation degree between the content of frequency block is recorded using the broadcasting that the correlation degree between the content of video block analyzes each user, from
And user is evaluated for the level of interest of video content, on the basis of obtaining level of interest of the user to video, base of the present invention
The shared of video resource is completed in level of interest, to effectively improve the shared efficiency of video resource；
2, the present invention will possess and be considered as play mode to the broadcasting behavior of the node of video content level of interest maximum value, go forward side by side one
Step, for the similarity degree of the difference of video content and broadcasting behavior, judges two nodes in video by comparing two nodes
It is whether similar in appearance interest and broadcasting behavior, to realize for the extraction of play mode and the cluster of node, there is identical broadcast
It carries out that the time of resource searching can be substantially reduced when video resource is shared between the node of mode playback, to reduce broadcasting video
Delay, promoted user experience；
3, the present invention allows to request on the basis of node clustering result and play mode extract the node of addition system to all
The head node INVENTIONBroadcast video request message that Node subsets close, so that node be accelerated to obtain video data process, promote video search
Success rate, reduce node start-up study, promoted video system service quality；
4, finally, the present invention allows to be matched between element and play mode in Node subsets conjunction, node is in Node subsets again
It is jumped between conjunction and the replacement of Node subsets syncephalon node, can not only effectively promote resource searching performance, the drop of video system
Low user's start-up study, and also reduce the maintenance load of Node subsets conjunction, improve the scalability of system.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is flow chart of the invention.
The sharing method extracted in wireless video shared system based on similar play mode, wireless video shared system include
The node of video server and several and video server communication connection, video server stores all in video system
Video resource provides video data for node, and sharing method includes S1 to S5.
S1, video server change interest journey of the behavior sensing node to video content of video playing point according to node
Degree.
Existing video-on-demand service mostly allows node, by changing the position of broadcast point, to broadcast here when playing video
It puts and a little refers to time point being played in video, the mode for changing broadcast point position mainly has F.F., rewind, pause or again
Play etc., by changing broadcast point, node can neatly obtain the video content at corresponding time point.Node changes broadcast point
Purpose mainly obtain and interested content and skip uninterested content, therefore node changes broadcast point position each time
Operation all reacted user to the level of interest of video content.When user is interested in video content, does not execute or execute
A small amount of broadcast point skip operation, and the distance that broadcast point jumps is shorter, to obtain continuous whole video content；When with
When family loses interest in video content, a large amount of broadcast point skip operation is executed, and the distance that broadcast point jumps is longer, thus
Skip a large amount of video content.Each node is different the level of interest of same video content, can pass through analysis node
Change the behavior of broadcast point to extract joint act of all nodes when playing same video.
The specific method of S1 includes S1.1 to S1.5.
One video is evenly divided into several continuous video blocks by S1.1, video server, and to all video blocks
Number consecutively.
Such as any video vjM video block, i.e. v can be uniformly divided intoj=(c1,c2,…,cm), each video block
With a serial number, the serial number difference between two adjacent video block is 1.The corresponding one section of continuous videos of each video block, this section
The duration of video can flexibly be set according to the actual situation, such as video vjWhen it is 5 minutes a length of, being evenly dividing is 50
Video block, then the corresponding one section of continuous videos of each video block when it is 6 seconds a length of.
It is to need to obtain according to certain length when obtaining video resource to the purpose that video carries out piecemeal, if video
Block length is short, then video number of blocks is more, then the number jumped between video block of the user in video display process is just more, load
It is high；If video number of blocks is few, video block can be brought too long, being loaded previously into local video data will be due to broadcast point
It jumps and fails, lead to the waste of network bandwidth.Therefore, in practical applications, need according in network video resource it is specific
Piecemeal quantity is adjusted flexibly in situation.
The behavior description that node changes video playing point is video block jump procedure by S1.2, video server.
The video block jump procedure that S1.3, video server generate when node is played video is integrated into a broadcasting note
Record plays record and corresponds with node and video.
Each node is playing video vjAfterwards, it generates a broadcasting and records L (vj), it plays and contains node in record and broadcast
All video blocks let off.If L (vj) in the serial number differences of adjacent video blocks be 1, then show the node in playing process
Do not change and actively changes broadcast point；If L (vj) middle there are the serial number differences of two adjacent video blocks to be greater than 1, then show that the node exists
Skip operation is produced in playing process.
S1.4, video server according to all nodes play same video broadcasting record calculate the video in video block it
Between correlation degree.
Specifically, as user niPlaying video sjWhen, broadcast point is from video block chJump to ck, then show chWith ckIt produces
Association is given birth to.If most users have been performed both by from chTo ckJump, then show chWith ckVideo content contact tightness degree
It is higher.In a video, if normal play, federation jump to next video from a video block to node in sequence
Block, therefore adjacent video block is strongest in the degree of contact of video content, at the same seldom can two serial number differences compared with
Jumped between big video block, so if the serial number difference between two adjacent video blocks is bigger, two video blocks it
Between degree of contact it is lower.
On the other hand, the correlation degree for only changing the behavior of broadcast point by node to judge between video block is not quasi- enough
True.Such as during actual play video, what node was jumped between the very big video block of two serial number differences
Purpose is typically to ignoring most video content, rather than because association journey with higher between two video blocks
Degree.
Therefore, when calculating correlation degree between video block, the broadcasting record of all nodes should be comprehensively considered, such as
Fruit has great deal of nodes all to be jumped between same two video blocks, then illustrates the association journey between the two video blocks
Degree is higher.For example, working as node niPlaying video sjWhen, broadcast point is from video block chJump to ck, then show chWith ckIt produces
Association is given birth to；If most of nodes have been performed both by from chTo ckJump, then show chWith ckVideo content contact tightness degree
It is higher.
The specific method of S1.4 includes S1.41 to S1.44.
S1.41, video server are obtained when all nodes play same video and are jumped between two target video blocks
The target frequency turned.
S1.42, video server are obtained when all nodes play same video and are jumped between any two video block
The frequency summation turned.
S1.43, video server calculate the ratio of target frequency and frequency summation, are recorded as between two target video blocks
Correlation degree.
S1.44, S1.41 to S1.43 is repeated until calculating the correlation degree between any two video block.
Such as video vj, vjIn two video block chWith ckBetween the specific calculation method of correlation degree are as follows:
Wherein, fhkIt executes for all users from chTo ckJump frequency；It is all users in any two video
The frequency summation of broadcast point skip operation is executed between block；Indicate chWith ckBetween jump correlation degree.
S1.5, video server are according to the correlation degree calculate node in video between video block to the interest journey of video
Degree.
The specific method of S1.5 includes S1.51 to S1.53.
S1.51, video server extract all video blocks from the broadcasting record that node plays a video and jumped
Journey.
S1.52, video server calculate the interest value of all video block jump procedures.
S1.53, video server sum to the interest value of all video block jump procedures, obtain node to the interest of video
Degree.
Such as calculate node is to video vjLevel of interest method are as follows:
Wherein, AeIndicate one from chTo ckVideo block jump, jumping for any one video block belongs to active user ni's
Play record Li(vj)；S is to play record Li(vj) in the contained quantity jumped.If niThe entire video of played in order, then jump number
Amount is m-1, i.e. s≤m-1；It indicates one and jumps AeLevel of interest value.Then Pi(vj) indicate niFor video vjInterest journey
Degree.
S2, video server extract several according to level of interest of all nodes to same video content and play mould
Formula, and all nodes are clustered according to play mode, obtain the conjunction of several Node subsets.
The specific method of S2 includes S2.1 to S2.6.
Level of interest of all nodes to same video is built into an interest-degree set by S2.1, video server.
Such as video vj, one interest-degree set PS of level of interest composition of all nodesj=(P1,P2,…,Pn)。
S2.2, video server remove highest level of interest from interest-degree set, and by highest level of interest pair
The broadcasting record for the node answered is defined as a play mode.
Such as video vj, first by PSjIn maximum value PiFrom PSjMiddle removal, and by PiCorresponding broadcasting record
Li(vj) it is used as a play mode, and by Li(vj) it is added to play mode list LsampleIn, remaining interest-degree set note
For
S2.3, video server calculate the interest in interest-degree set between remaining level of interest and highest level of interest
Similarity, and the broadcasting participated between node corresponding to two level of interest that Interest Similarity calculates record similarity.
The specific method of S2.3 includes S2.31 to S2.33.
S2.31, video server calculate the ratio of remaining level of interest and highest level of interest in interest-degree set, note
For Interest Similarity.
Specific calculation method are as follows:
Wherein, PjAnd PiRespectively node njAnd niFor video vjLevel of interest value.Due to PiFor set PSjIn maximum
Value, therefore, Pi≥Pj,ISij∈[0,1]。ISijValue is bigger, then shows njAnd niFor video vjInterest Similarity it is higher；Instead
It, then show njAnd niFor video vjInterest Similarity it is lower.
The broadcasting record of node is converted into string of binary characters, the length of string of binary characters by S2.32, video server
Equal with the quantity of video block in video, playing the corresponding binary-coded character of video block present in record is 1, is played in record
It is 0 there is no the corresponding binary-coded character of video block.
For example, if node njHave viewed video block c1, then SjThe first binary word identifier value be 1 (i.e. c1It is comprised in Lj
(vj) in)；Otherwise, if njVideo block c is not watched1(i.e. c1It is not included in Lj(vj) in), then SjThe first binary word
Identifier value is 0.
S2.33, video server calculate the Hamming distance between two strings of binary characters, then by string of binary characters
Length and Hamming distance difference as molecule, using the length of string of binary characters as denominator, obtained ratio, which is denoted as, to be broadcast
Put record similarity.
Specific calculation method are as follows:
Wherein, m vjVideo number of blocks；D(Si,Sj) be two strings of binary characters Hamming distance.If LSijValue is bigger,
Then show njAnd niFor video vjBroadcasting behavior it is more similar；Conversely, then showing njAnd niFor video vjBroadcasting behavior get over
It is dissimilar.
S2.4, video server according to Interest Similarity and play record similarity and judge that the broadcasting behavior of two nodes is
It is no similar.
The specific method of S2.4 includes S2.41 to S2.42.
S2.41, video server calculate the mean value of all level of interest in interest-degree set.
S2.42, in interest-degree set in remaining all level of interest, when level of interest is greater than mean value, and this is emerging
When broadcasting record similarity between interesting degree corresponding node and highest level of interest corresponding node is greater than Interest Similarity, determine
It is similar to the broadcasting behavior of highest level of interest corresponding node that the broadcasting records corresponding node.
For example, settingFor set PSjThe mean value of middle all elements.IfMiddle either elementAnd LSij≥ISij,
Then think njAnd niFor video vjBroadcasting behavior be similar；It is on the contrary, then it is assumed that njAnd niFor video vjBroadcasting behavior
It is dissimilar.
Node corresponding with highest level of interest is had all nodes of similar broadcasting behavior equal by S2.5, video server
It is mapped in the play mode of S2.2.
For example, njAnd niIt is similar with the behavior of broadcasting, then by njAnd niThe new Node subsets of building one close NSj, and by Pj
FromMiddle removal.
S2.6, video server repeat S2.2 to S2.5, until number of elements contained in interest-degree set be 0, most
For all node clusterings into several play mode, each play mode corresponds to one or more node at last.
By above-mentioned iterative process, generate about video vjPlay mode list LsampleIt is closed with Node subsets
List NLj=(NSa,NSb,…,NSk).Wherein, NLjMiddle either element and LsampleMiddle element is corresponding, that is to say, that LsampleIn
Contained any play mode is and NLjIn Node subsets close and correspond to.NLjContained level of interest in middle any node subclass
Maximum element is the head element that Node subsets close, and the head element that Node subsets close is responsible for receiving video request message, searches view
The state of other nodes is (i.e. when new node is added to subclass or subclass in frequency resource provider and maintenance Node subsets conjunction
Interior joint exits current subnet conjunction).
S3, video server specify a head node in the conjunction of each Node subsets, and head node is responsible for safeguarding affiliated node
The state change behavior of other nodes and caching resource information, all head nodes are safeguarded jointly between all nodes in subclass
Video shares behavior.Meanwhile one or more candidate head node is also specified, it is candidate when head node, which exits Node subsets, to be closed
Head node becomes new head node.
Since the head element that Node subsets close is responsible for state (being added and exit set), the management collection of maintenance set interior nodes
The resource (the video block message for collecting set internal segment point cache) and processing video block request message of storage in closing (gather interior sum aggregate
Close the request message of exterior node), therefore, the load of head node is often larger.The load for how reducing head node, which becomes, promotes system
The critical issue for scalability of uniting.
The first way that can be used is a Message Processing queue to be arranged for head node, the length of queue is according to head
Calculating, storage, bandwidth and the cruising ability setting of node.If message queue has expired and had new message to reach, head node will
Newly arrived node is forwarded at candidate head node and abandons the message；If message queue is less than, head node, which continues with, newly to be arrived
The message reached.
The second way that can be used is, if contained DBMS member's number of nodes in the larger i.e. system of video system
When measuring larger, head node and candidate head node can not also undertake the processing load of magnanimity request message, then can be according to present node
Gather the quantity that interior nodes scale sets candidate head node, i.e., candidate head node subclass, thus balanced message processing load.
On the other hand, because head node possesses the maximum value of level of interest in present node subclass, once cephalomere
Point is completed after exiting the set for the broadcasting of video content, then the node for possessing current interest degree maximum value in set should
As new head node.Therefore, head node can select the node for possessing current interest degree maximum value in set (except head node
It is outside) candidate head node, when head node, which exits Node subsets, to be closed, the node listing of local maintenance is sent to candidate by head node
Head node sends the node listing comprising new head node information and current collection to video server, video to server
The node listing of server update local maintenance.In addition, the ID of head node all new head nodes of node broadcasts into set, thus
Completion is exited.
Specific method is as follows.
Wherein, | NSi| NS is closed for Node subsetsiInterior contained number of nodes；|Li| it is closed for Node subsets contained in corresponding play mode
Video number of blocks；For head node and candidate head node Message Processing queue average length.|NSi|*|Li| indicate that Node subsets close
Interior all nodes, which are completed to play, needs to generate maximum message quantity.For candidate head node needed for present node subclass
The quantity of element contained by subclass.Head node will be ranked up all nodes in gathering according to level of interest, and selectA node is as candidate head node.The node for possessing subject of great interest degree value in candidate head node subclass is responsible for note
The message processing load of other candidate head nodes is recorded, and according to load allocation request message.That is, head node disappears request
Breath is forwarded to the candidate head node for possessing subject of great interest degree value, and the latter turns according to the load balancing distribution of other candidate head nodes
The message of hair, so that load balancing is realized, with the scalability of lifting system.
Head node safeguard belonging to Node subsets close in other nodes state change behavior method include S3.11 extremely
S3.14。
The Node subsets that S3.11, head node receive other nodes in the conjunction of affiliated Node subsets close change request, section
Point subclass change request includes new node subclass information and change requesting node information.
S3.12, head node will change requesting node and delete from the conjunction of affiliated Node subsets.
Node subsets are closed the head node that change request is forwarded to new node subclass by S3.13, head node.
The head node receiving node subclass change request of S3.14, new node subclass, and will change requesting node addition
Into the conjunction of affiliated Node subsets.
The method that all head nodes safeguard that the video between node shares behavior jointly includes S3.21 to S3.22.
S3.21, head node receive from affiliated Node subsets close in other nodes video request message or from its
The video request message that the forwarding of its head node comes, video request message include request video block message.
S3.22, head node close the video block of interior all nodal caches according to request video block message from affiliated Node subsets
In inquired, if successful inquiring by be cached with request video block video provide node information return to request section
Point, requesting node and responsive node are established connection progress video and are shared, and unsuccessfully disappear if inquiring failure to requesting node return
Breath.
For example, nkTo head node niRequest message, n are exited in transmissioniBy nkMessage deleted from local node list, and
Forward nkThe head node that is closed to the corresponding Node subsets of new play mode of message, to complete nkIn play mode and node
Switching between set.Otherwise, if LsampleMiddle element and nkBroadcasting record matching result maximum value be less than or equal to nkIt is saved with place
Point subclass corresponds to the matching result of play mode, then nkIt rests in present node subclass, and nkSet in search failure
Number resets to 0.The currently playing record of calculate node and play mode list L are setsampleIn matching degree between contained element
Entry condition is the switching between the play mode in order to avoid frequently implementing node and the conjunction of affiliated Node subsets, to reduce node
Gather the load of head node.
S4, system is added for video server maintenance new node or node logs off.
The specific method of S4 includes S4.A and S4.B.
Video sharing system is added in S4.A, new node, and specific method includes S4.A1 to S4.A5.
S4.A1, video server receive new node addition request message, be added solicited message include new node information,
The buffered video list of video information and new node is requested, then new node is added in node listing by video server, and
And the information of play mode list and all head nodes is sent to new node.
For example, when video server is received from any mobile node nkAfter the request message of video system is added, depending on
Frequency server is by nkInformation be added to node listing LnodeIn, and by play mode list LsampleThe cephalomere closed with Node subsets
Point list NBSjIt is sent to nkPlace.
S4.A2, new node are broadcasted to all head nodes is added request message, and receives the successful inquiring from head node
Message or inquiry failed message, successful inquiring information include video vendor ID.
nkTo NBSjMiddle all elements broadcast request message, NBSjIn receive nkRequest message after, be nkInquiry request
Video resource, successful inquiring is then to nkReturn to the confirmation message containing video vendor ID.If NBSjIn all nodes can not look into
The video resource of request is ask, still to nkInquiry failed message is returned to, then nkVideo data is requested to server.
S4.A3, new node terminate reception after receiving first successful inquiring message, abandon subsequent all inquiries
Success message or inquiry failed message.
In order to avoid generating conflict, n between multiple queries success messagekIt can receive the successful inquiring message of first return simultaneously
The confirmation message of remaining return is abandoned, because the return speed of successful inquiring message can reflect transmission view to a certain extent
The speed of frequency is faster.
S4.A4, new node according in first successful inquiring message video vendor ID and video vendor establish connect
It connects, receives the request video sent from video vendor.
S4.A5, video server set the play mode of video vendor to the default play mode of new node, and
During Node subsets where new node to be added to video vendor close.
Such as any mobile node nkAfter video system is added, nkConnect video vendor nhTo obtain video data.This
When, due to nkInitial stage in video playing can not assess nkAffiliated play mode, therefore, nkN is addedhAffiliated section
Point subclass NSi, and by nhCorresponding play mode is as nkDefault play mode, thus rapidly by nkIt is added to video
In system, to ensure that video system can be nkService is provided, to promote the usage experience of new user in video system.With
Afterwards, nhTo set NSiHead node niSend nkNodal information (include nkNode ID and local buffer in the video that stores
Block message).niBy nkNodal information store to local Node subsets and close NSiIn.
S4.B, node exit video sharing system, and specific method exits request message for video server receiving node,
Exiting request message includes all broadcasting records of the node.
S5, video server perception new node actively change the behavior that affiliated Node subsets close.
As new node plays the increase of amount of video, the play mode of new node may change, such as new node
Interested content is changed, and new node may be not suitable for its current affiliated Node subsets conjunction at this time, needs to shift
Into the conjunction of other Node subsets.Such as new node nk, with nkThe increase of broadcasting content, works as nkBroadcasting behavior and nk
Affiliated Node subsets close corresponding play mode difference and are gradually expanded, at this time nkBroadcast continually can be closed to other Node subsets to ask
Seek message, that is to say, that nkThe video resource that affiliated Node subsets close storage is unable to satisfy nkDemand, so as to cause a large amount of
Node subsets close the case where interior resource searching failure.The way of search of broadcast request message not only increases NBSjMiddle element is born
It carries, and also increases nkStart-up study.Therefore, nkNeed to calculate currently playing record and play mode list LsampleMiddle institute
Containing the matching degree between element, closed with the play mode and Node subsets of readjusting affiliated.
In S5, it includes S5.1 to S5.5 that node, which actively changes the method that affiliated Node subsets close,.
S5.1, new node use r according to itself search failure rate in the conjunction of affiliated Node subsetskIt indicates.
S5.2, new node obtain the average search failure rate that affiliated Node subsets close interior all nodes from head node, use ri
It indicates.
Itself search failure rate is compared by S5.3, new node with average search failure rate, if itself search failure
Rate is greater than average search failure rate, then carries out S5.4, if itself search failure rate is less than average search failure rate, stops.
Such as nkCalculate currently playing record and play mode list LsampleIn between contained element matching degree trip bar
Part is defined as:Wherein,And FkRespectively nkFailed searches number and search total time
Number；And TFiRespectively Node subsets close NSiInterior search failure total degree and search total degree.
S5.4, new node, which calculate, itself plays record and the matching degrees of all play mode, and from all play mode
Middle selection is with itself broadcasting highest play mode of record matching degree as new play mode.
S5.5, new node are transferred in the conjunction of Node subsets corresponding to new play mode.
Work as nkIt completes and play mode list LsampleIn between contained element when the calculating of matching degree, L if it existssampleIn
Element and nkBroadcasting record matching result maximum value be greater than nkThe matching result of play mode corresponding with the conjunction of place Node subsets,
Then regard nkBroadcasting behavior belong to new play mode, nkIt exits present node subset and merges the corresponding section of the new play mode of addition
Point subclass.
Further, because node exit will lead to member in video system broadcasting record change, if this
Kind variation is frequent, then will adversely affect to the process for extracting play mode, if exiting it than each node
Rear video server all extracts a play mode again can then generate huge calculating pressure, therefore video to video server
The broadcasting that server collects all DBMS members will first determine the update cycle for playing record before recording, if time update cycle
When more than defined threshold T, then video server is completed to extract the play mode of all videos according to the broadcasting record of collection
With the clustering processing of corresponding node subclass.
The invention proposes the sharing methods extracted in a kind of wireless video shared system based on similar play mode, below
Abbreviation SPPE.
Firstly, SPPE proposes a video play mode extraction algorithm, by investigating user's jumping between video block
Operating frequency assessment user operates the correlation degree between the content for reflecting two video blocks every time, using between the content of video block
Correlation degree analyze each user broadcasting record, to evaluate user for the level of interest of video content.It is being used
On the basis of family is to the level of interest of video, the present invention is based on level of interest to complete the shared of video resource, to effectively mention
The shared efficiency of high video resource.
Then, SPPE, which will possess, is considered as play mode to the broadcasting behavior of the node of video content level of interest maximum value,
And further by comparing two nodes for the similarity degree of the difference of video content and broadcasting behavior, judge that two nodes exist
It is whether similar in video content interest and broadcasting behavior, to realize for the extraction of play mode and the cluster of node.Have
The time that can substantially reduce resource searching when video resource is shared is carried out between the node of identical play mode, is broadcast to reduce
The delay of video is put, user experience is promoted.
Later, on the basis of node clustering result and play mode extract, SPPE proposes the side that system is added in node
Method, the head node INVENTIONBroadcast video request message for allowing that the node of addition system is requested to close to all Node subsets, thus acclerating section
The success rate that point obtains video data process, promotes video search reduces the start-up study of node, promotes the service of video system
Quality.
Finally, SPPE further provides the matching again of element and play mode in Node subsets conjunction and closes in Node subsets
Between the replacement method of method and Node subsets syncephalon node that jumps, the resource that can not only effectively promote video system searches
Can, user's start-up study be reduced without hesitation, and also reduces the maintenance load of Node subsets conjunction, improves the expansible of system
Property.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. the sharing method extracted in wireless video shared system based on similar play mode, the wireless video shared system packet
The node of video server and several and video server communication connection is included, video server stores the shared system of wireless video
All video resources in system, it is characterised in that: the sharing method includes the following steps:
S1, video server change level of interest of the behavior sensing node to video content of video playing point according to node；
S2, video server extract several play mode according to level of interest of all nodes to same video content, and
All nodes are clustered according to play mode, obtain the conjunction of several Node subsets；
S3, video server specify a head node in the conjunction of each Node subsets, and head node is responsible for safeguarding affiliated Node subsets
The state change behavior of other nodes and caching resource information, all head nodes safeguard the video between all nodes jointly in closing
Shared behavior；
S4, system is added for video server maintenance new node or node logs off；
S5, video server perception new node actively change the behavior that affiliated Node subsets close.
2. the sharing method extracted in wireless video shared system as described in claim 1 based on similar play mode, special
Sign is: the specific method of S1 includes:
One video is evenly divided into several continuous video blocks by S1.1, video server, and successively to all video blocks
Number；
The behavior description that node changes video playing point is video block jump procedure by S1.2, video server；
The video block jump procedure that S1.3, video server generate when node is played video is integrated into a broadcasting record, broadcasts
It puts record and node and video corresponds；
S1.4, video server calculate in the video between video block according to the broadcasting record that all nodes play same video
Correlation degree；
S1.5, video server are according to the correlation degree calculate node in video between video block to the level of interest of video.
3. the sharing method extracted in wireless video shared system as claimed in claim 2 based on similar play mode, special
Sign is: the specific method of S1.4 includes:
S1.41, video server, which obtain, to be jumped between two target video blocks when all nodes play same video
Target frequency；
S1.42, video server, which obtain, to be jumped between any two video block when all nodes play same video
Frequency summation；
S1.43, video server calculate the ratio of target frequency and frequency summation, are recorded as the pass between two target video blocks
Connection degree；
S1.44, S1.41 to S1.43 is repeated until calculating the correlation degree between any two video block.
4. the sharing method extracted in wireless video shared system as claimed in claim 3 based on similar play mode, special
Sign is: the specific method of S1.5 includes:
S1.51, video server extract all video block jump procedures from the broadcasting record that node plays a video；
S1.52, video server calculate the interest value of all video block jump procedures；
S1.53, video server sum to the interest value of all video block jump procedures, obtain node to the interest journey of video
Degree.
5. the sharing method extracted in wireless video shared system as claimed in claim 4 based on similar play mode, special
Sign is: the specific method of S2 includes:
Level of interest of all nodes to same video is built into an interest-degree set by S2.1, video server；
S2.2, video server remove highest level of interest from interest-degree set, and highest level of interest is corresponding
The broadcasting record of node is defined as a play mode；
The interest that S2.3, video server calculate in interest-degree set between remaining level of interest and highest level of interest is similar
Degree, and the broadcasting participated between node corresponding to two level of interest that Interest Similarity calculates record similarity；
S2.4, video server according to Interest Similarity and play record similarity judge two nodes broadcasting behavior whether phase
Seemingly；
Node corresponding with highest level of interest there are all nodes of similar broadcasting behavior to map by S2.5, video server
Into the play mode of S2.2；
S2.6, video server repeat S2.2 to S2.5, until number of elements contained in interest-degree set be 0, finally will
For all node clusterings into several play mode, each play mode corresponds to one or more node.
6. the sharing method extracted in wireless video shared system as claimed in claim 5 based on similar play mode, special
Sign is: the specific method of S2.3 includes:
S2.31, video server calculate the ratio of remaining level of interest and highest level of interest in interest-degree set, are denoted as emerging
Interesting similarity；
The broadcasting record of node is converted into string of binary characters, the length and view of string of binary characters by S2.32, video server
The quantity of video block is equal in frequency, and playing the corresponding binary-coded character of video block present in record is 1, plays and does not deposit in record
It is 0 in the corresponding binary-coded character of video block；
S2.33, video server calculate the Hamming distance between two strings of binary characters, then by the length of string of binary characters
The difference of degree and Hamming distance is as molecule, and using the length of string of binary characters as denominator, obtained ratio is denoted as broadcasting note
Record similarity.
7. the sharing method extracted in wireless video shared system as claimed in claim 5 based on similar play mode, special
Sign is: the specific method of S2.4 includes:
S2.41, video server calculate the mean value of all level of interest in interest-degree set；
S2.42, in interest-degree set in remaining all level of interest, when level of interest is greater than mean value, and the interest journey
When the broadcasting record similarity spent between corresponding node and highest level of interest corresponding node is greater than Interest Similarity, determine that this is broadcast
It is similar to the broadcasting behavior of highest level of interest corresponding node to put record corresponding node.
8. the sharing method extracted in wireless video shared system as claimed in claim 7 based on similar play mode, special
Sign is: in S3, while video server specifies head node in the conjunction of each Node subsets, also specifying one or more time
Head node is selected, when head node, which exits Node subsets, to be closed, candidate head node becomes new head node；
The method of the state change behavior of other nodes includes: in Node subsets conjunction belonging to head node maintenance
The Node subsets that S3.11, head node receive other nodes in the conjunction of affiliated Node subsets close change request, node
Set change request includes new node subclass information and change requesting node information；
S3.12, head node will change requesting node and delete from the conjunction of affiliated Node subsets；
Node subsets are closed the head node that change request is forwarded to new node subclass by S3.13, head node；
The head node receiving node subclass change request of S3.14, new node subclass, and change requesting node is added to institute
Belong in Node subsets conjunction；
All head nodes safeguard jointly the video between node share behavior method include:
S3.21, head node receive from affiliated Node subsets close in other nodes video request message or from other heads
The video request message that node forwarding comes, video request message include request video block message；
S3.22, head node according to request video block message from affiliated Node subsets close in all nodal caches video block in into
The information that the video for being cached with request video block provides node is returned to requesting node if successful inquiring, asked by row inquiry
It asks node and responsive node to establish connection progress video to share, returns to failed message to requesting node if inquiring failure.
9. the sharing method extracted in wireless video shared system as claimed in claim 8 based on similar play mode, special
Sign is: the specific method of S4 includes:
Video sharing system is added in S4.A, new node, and specific method includes S4.A1 to S4.A5；
S4.A1, video server receive the addition request message of new node, and it includes new node information, request that solicited message, which is added,
The buffered video list of video information and new node, then new node is added in node listing by video server, and will
The information of play mode list and all head nodes is sent to new node；
S4.A2, new node are broadcasted to all head nodes is added request message, and receives the successful inquiring message from head node
Or inquiry failed message, successful inquiring information include video vendor ID；
S4.A3, new node terminate reception after receiving first successful inquiring message, abandon subsequent all successful inquirings
Message or inquiry failed message；
S4.A4, new node according in first successful inquiring message video vendor ID and video vendor establish connection, connect
Receive the request video sent from video vendor；
S4.A5, video server set the play mode of video vendor to the default play mode of new node, and will be new
Node is added to during the Node subsets where video vendor close；
S4.B, node exit video sharing system, and specific method exits request message for video server receiving node, exits
Request message includes all broadcasting records of the node.
10. the sharing method extracted in wireless video shared system as claimed in claim 9 based on similar play mode, special
Sign is: the specific method of S5 includes:
S5.1, new node calculate itself search failure rate in the conjunction of affiliated Node subsets；
S5.2, new node obtain the average search failure rate that affiliated Node subsets close interior all nodes from head node；
Itself search failure rate is compared by S5.3, new node with average search failure rate, if itself search failure rate is big
In average search failure rate, then S5.4 is carried out, if itself search failure rate is less than average search failure rate, stopped；
S5.4, new node calculate itself and play the matching degree of record with all play mode, and select from all play mode
It takes and itself plays the highest play mode of record matching degree as new play mode；
S5.5, new node are transferred in the conjunction of Node subsets corresponding to new play mode.
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