CN100384252C - Method for implementing video request program under cover network multicasting - Google Patents
Method for implementing video request program under cover network multicasting Download PDFInfo
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Abstract
The present invention relates to a method for realizing video requests under coverage network multicast. The method comprises the steps that when a video program is first requested, a video server establishes a multicast flow for a user; when the user asks for adding the same video node, different playing delays are introduced, the playing delay of the nodes which are near to the root node is small, and the playing delay of the nodes which are far from the root node is large; the quick advance and quick recession of VCR operation is achieved by a multicast VCR operation method, suitable multicast flows are merged when user VCR operation in a multicast VCR operation group is ended. Under the coverage network multicast, optimized user latency time can be added, few flow numbers and user buffer area logic blocks are used, and the playing continuity of service users of a VOD system is effectively guaranteed; the multicast VCR operation can greatly reduce the number of the required flows for achieving VCR by unicast. Besides, the present invention provides the functions of effective pause, quick advance, quick recession and repositioning and benefits the large-area realization of a VCR function in networks.
Description
Technical field
The present invention relates to a kind of video request program under cover network multicasting implementation method.Belong to the communication technical field of multicast.
Background technology
Along with development of internet technology, people can enjoy resource-sharing in the place of any network-in-dialing, and video request program (VOD) technology can satisfy work multiple demand in the amusement of people, need develop to direction more stable and the service more users.
Cover network multicasting is a kind of logical network that makes up on original physical network arrangement, as the node that makes up multicast tree, finish duplicating and transmitting of data by subscriber's main station, subscriber's main station can disperse storage with data like this, data source as temporary transient alleviates server stress.
In the VOD system, media server is arranged the fragmented storage of Media Stream, and for user's request, for the user sets up Media Stream retrieval and transmission, the media stream scheduling method has determined realization and the system service scope and the effect of video request program.At present, the VOD system in the application can reduce server stress in conjunction with multicasting technology, reaches resource-sharing.Media stream scheduling method in conjunction with multicast mainly contains Batching, Delamination Transmission technology, Patching etc.Batching is exactly batch processing, be with a period of time (being called time slot) be the boundary, to the request that arrives in during this period of time, the user who postpones to arrive first asks, do not set up any stream, but all requests that arrive in the boundary are divided into one group, set up and send a multicast data flow at the event horizon destination county.Decide the Batching of system performance by time slot length like this.The Delamination Transmission technology is requirement, for a video frequency program, what preserve at the server place is an elementary streams file (comprise and guarantee basic play quality information needed) and a series of enhanced flow file, on elementary streams, use the enhanced flow of interleave technology stack different stage, frame per second improves, obtain the video playback effect of corresponding different stage, can have the node decision of this ability need or to abandon which stream by video server or following some during transmission.When the user leaves multicast group gradually, after multicast member is 0, discharge multicast data flow.
VCR operation is exactly F.F., and rewind down suspends, and the feature operation that media player had such as reorientates, and its realization is determined by the media stream scheduling method.In video request program, it is to set up unicast stream to requesting users that minority provides the VCR operated system, and EO discharges unicast stream again, and the user is incorporated in the suitable multicast data flow.But majority does not provide all VCR operations, and some only provides realization simple relatively pausing operation, and only a few can provide reorientates operation, and connection failure or oversize problem of stand-by period usually occur.
Cover network multicasting combines with the VOD system, and in time slot, the user who same video frequency program is proposed playing request is divided into one group, make up multicast tree, the user plays the part that oneself will watch after receiving data, and, temporarily store a part of data by server-assignment.As the same video frequency program of user's program request, server is notified him to be connected into suitable subscriber's main station according to the program request point and is obtained data.But because the uncertainty of subscriber's main station makes leaving of non-leaf node may cause affected node to play and interrupt, and the media stream scheduling method did not all have this is made protection effectively in the past, so the VOD system under the cover network multicasting can't promote always.
Summary of the invention
Purpose of the present invention is exactly in order to make under the cover network multicasting, solve in the Video-on-demand playing process, non-leaf node user leaves and causes following node to play the phenomenon of interrupting probably, especially the needs that meet the feature and the cover network multicasting characteristics of online request video frequency program, the period of reservation of number optimum, minimum flow amount, minimum user buffering district logic partitioning, make the user can be real-time, stable online request video frequency program.Simultaneously provide VCR to operate the pressure that brings to server, propose a kind of implementation method of multicast VCR operation, realize online flexibility of watching of user and independence in order to alleviate.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of video request program under cover network multicasting implementation method of the present invention has following steps;
Step (1) is put sowing time first to a certain video frequency program, and video server is set up a multicast data flow for the user at once;
Step (2), when the user asks same video, node adds fashionable, introduces different playout-delays, and the node playout-delay near from root node is little, and the node playout-delay far away from root node is big;
Step (3) when having non-leaf node to leave, is rebuild multicast tree, and newly-built afterwards multicast data flow by the plays clip that the Delamination Transmission compensating technique loses, is play continuity with assurance; When leaf node leaves, can not impact, need not consider other nodes broadcasts;
Step (4) does not have node to add and during node leaves, keeps multicast data flow and normally transmit;
Step (5), realize the F.F. and the rewind down of VCR operation with multicast VCR method of operating, user VCR EO in the multicast VCR operational group, incorporate suitable multicast data flow into, the same step of adition process (2) when the user all leaves in the VCR operational group, discharges this VCR multicast data flow, suspend and reorientate operation and finish the back and when the recovery normal play, incorporate suitable multicast data flow, the same step of adition process (2) into;
Step (6) after the user of Video-on-demand all left, discharges multicast data flow.
Using good effect of the present invention is: the VOD method in the above technical scheme can be under cover network multicasting, add optimized period of reservation of number, use less flow amount and user buffering district logic partitioning, the number of required stream provided effective time-out when the operation of effectively assurance VOD system service user's broadcast continuity, and multicast VCR can significantly reduce with clean culture realization VCR, F.F., rewind down is reorientated function, helps large tracts of land realization VCR function in the network.
The present invention program's video request program implementation method is equally applicable to the situation that the IP multicast combines with cover network multicasting, the broadcast of continous-stable equally can be provided to the user, and finish VCR operation for the user, add when recovering normal play in the process of suitable multicast data flow and use.Multicast VCR method of operation is applicable to the catenet VOD system of any employing multicast mode, especially is fit to user's program request peak period and uses, and can be used for online television or live system, but rewind down and positioning function backward can only be provided.
Description of drawings
Fig. 1 is a VOD method implementation procedure flow chart of the present invention (not comprising the VCR process), and a calculates the playout-delay module, and b is basic video request program flow process figure.
Fig. 2 is the process flow diagram that VCR realizes in the video request program of the present invention.
Fig. 3 is the schematic diagram of embodiment, illustrates that node adition process period of reservation of number is set in the media stream scheduling strategy, and a is wherein arranged, and b two width of cloth figure have described the node adition process.
Fig. 4 is the schematic diagram of embodiment, illustrates that non-leaf node in the media stream scheduling strategy leaves the value of user buffering district data and period of reservation of number in the process, and a is wherein arranged, b, and c, d four width of cloth figure have described node and have left process.
Fig. 5 is the schematic diagram of embodiment, and the dynamic adition process of user in the multicast VCR operating process is described.
S represents the video server (Server) of VOD system among the figure, and A, B, C, D, X, Y represent the user of online order video program.T is that one section video frequency program sends required time (general is identical with reproduction time).
The present invention is further described below in conjunction with drawings and Examples.
Embodiment
Step 4, keep the normal transmission of multicast data flow, monitoring network and multicast member state, change the step of " when the user asks the same video frequency program of program request " over to if receive the request of the same video frequency program of user's program request; Leave if detected the user, change the step of " when user report is left or server when detecting the user and breaking away " over to; Want the VCR request of operating if receive the user, change the step of " when the user asks the VCR operation " over to; Want the request of pausing operation if receive the user, change the step of " when the user asks pausing operation " over to;
Step 5, judge whether that node number in the multicast tree is zero, if not, then changes step 3 over to;
Step 6, release multicast data flow;
When the user asks the same video frequency program of program request:
Step 4, the node depth information that the user is inserted are given and are calculated the playout-delay module, obtain suitable playout-delay;
Step 5, notify the user to receive data, and when playing, adopt corresponding playout-delay; Change key step 4 afterwards over to.
When user report is left or server when detecting the user and breaking away:
Step 4, when calculating playout-delay that the playout-delay module calculates and node and leave the data point information of normal transmission, rebuild multicast data flow, lose data with the delamination propagation technique complementary, uninfluenced user abandons repeating data,
Step 5, recovery normal play; Change key step 4 afterwards over to.
When the user asked the VCR operation, VCR operating process step as shown in Figure 2 was as follows,
Whether step 2, judgement request broadcast point drop in the frequent fragment of VCR operation, and if not, then setting up a unicast stream is user's service,
Step 4, determine the VCR action type, then enter node and add program step if reorientate; Then change the pausing operation step over to if suspend;
Step 5, if select F.F. or rewind down, judge whether this operation is the F.F. or the fast reverse operation of first request, if, then begin the timing of a time slot, enter step 6 afterwards; If not, directly enter step 6;
Step 6, according to program request point queuing,
Step 7, judged whether the terminal point of time slot, if not, the then end of stand-by period groove if write down all program request point queueing messages, is sent into step 9,
Step 8, search for required fragment, set up the VCR multicast data flow, begin to send data from fragment,
Step 9, notify the user to add the VCR multicast data flow successively,
Step 10, keep the VCR multicast data flow,
Step 11, monitoring multicast VCR multicast member state have judged whether that the member leaves, and if not, then change step (10) over to, if, then enter next step, and recording user leaves dot information, enter node and add program step;
Step is as follows when the user asks pausing operation:
Step 4, judge whether recover to play, if not, then change step 3 over to,
Step 5, enter node adition process step.
If arbitrarily the buffering area of user node is enough big, it is identical that non-leaf node leaves the multicast tree reconstruct required time that causes, and multicast tree reconstruct stable after, the node that reconnects can obtain to reconstruct before similar bandwidth performance.
Key step 4 described processes when the user asks the same video frequency program of program request specifically describe and are: when user's program request same video program is arranged in the time slot, server is according to the needed data of user, arrange the user to add position suitable in the multicast tree, the degree of depth might be different.Playout-delay refers to receive data from the user, and the data buffer memory in a period of time is not play, and is exactly playout-delay during this period of time, is in order to cushion abundant data, can to make when losing data source in the short time, and the user also has enough data playback.For the setting of playout-delay, adopt to calculate the playout-delay module, as Fig. 1 a, input nodal information (single or multiple all can), good playout-delay (single or multiple accordingly) is calculated in output.Calculating principle is according to network conditions, and the closer to root node, it is more little to be subjected to other nodes to leave the probability that influences, the playout-delay that adopts is more little, otherwise it is many more to contain node on the path apart from root node, and the probability that left by other nodes to influence is big more, so the playout-delay that adopts is big more; Simultaneously, the probability that a plurality of nodes leave influence simultaneously is more a lot of greatly than the probability that two nodes leave simultaneously, then the probability that leaves influence simultaneously apart from a plurality of nodes on the root node path will increase and reduce rapidly with leaving the node number, then the difference of the playout-delay of adjacent node increases with distance and reduces rapidly on the paths, last difference will converge to 0, when user's playout-delay that need only guarantee to close on root node is not less than a node and leaves, rebuild to connect the needed time, thus node add fashionable the playout-delay that should introduce can be according to network, the actual conditions of server monitoring users frequency and server handling ability are calculated.In this case, the calculating of multicast time slot must be charged to different depth period of reservation of number limiting value, and new multicast data flow is set up in the request that time slot is outer again.
Key step 4 described nodes leave process as shown in Figure 4: when server is received the notice that the user leaves, or monitored user's accident when leaving, if leaf node, it does not leave can influence the multicast user, if but he is last node, finish multicast data flow.If be that non-leaf node leaves, determine node location, rebuild multicast tree.Rebuild in the process that connects, node adds fashionable additional playout-delay and can guarantee to have in the user buffering district enough data to continue to play.Consider from the total number aspect that reduces stream, rebuild multicast data flow.After node is connected into, original multicast data flow is discharged, use the Delamination Transmission technology, use the multicast data flow of the data of one of low frame per second transmission positive transmission when non-leaf node leaves as starting point, the member who receives data is all nodes of newly-built multicast tree, but in order to fill the time difference of obliterated data, on original bandwidth basis, with lower elementary streams multicast a period of time of quality, data return to before node leaves in all affected node buffering areas, guarantee to play the continuity data of required playout-delay time, unaffected node abandons repeating data, afterwards, server calculates (with calculating the playout-delay module according to rebuilding the node degree of depth of living in this moment that connects, as shown in Figure 1a, calculate the playout-delay of all affected node simultaneously), when making data volume in its buffering area it just having added the needed playout-delay time span of this multicast group for hypothesis, recover the multicast of normal frame rate, like this can be under the situation that does not increase bandwidth, the data that additional affected node loses, simultaneously, has only a data flow on the link from start to finish, the user buffering district only needs two logical buffers from start to finish, data in the multicast data flow that the data that storage will be play, storage wouldn't be play.
Key step 4 described multicast VCR methods of operation are: in advance will be for a film of being made of its files in stream media N unit (unit interval is play the data that comprised), film VCR operation (is removed pausing operation at the server place in according to historical data, only handle F.F., rewind down and reorientate operation) frequently situation segmentation, the frequent fragment of identical VCR operation is divided into one section, and wherein each segmentation is sorted according to VCR program request rate again.Putting before this, the VCR operating process as shown in Figure 2, user to the frequent fragment program request of same VCR operation, in the time slot of identical VCR operation (F.F. is identical with the rewind down process, but also will distinguish timing), set up the VCR multicast data flow, send a piece of data, but because the identical VCR request of operating of user starting point might have small difference, according to the user to the program request point of this section to user's queuing, and according to the program request dot information notify the user when appropriate between the dynamic adding VCR multicast data flow of point.As seen, for catenet, the member is more in the multicast group, and the time slot length restriction when being added multicast group, watching a little can be not too wide in the gap, worst case is that first request in the time slot is positioned at time slot and begins the place, and requires to begin VCR from this section end, and period of reservation of number is time slot length and this section reproduction time sum; And best-case is that last request is positioned at time slot ending place in the time slot, and requires to begin VCR from this section, and period of reservation of number is 0.If according to the program request rate that priori data provided files in stream media is cut apart, will the section of concentrating on first to certain section program request, time slot can be very short like this, and the stand-by period of all program requests all can be very short, also saved server and Internet resources simultaneously.
Concrete VCR operating process and the recovery normal play process of dividing.Suspend and reorientate broadcast and do not have operating process, broadcast for FF (F.F.) and FR (rewind down), the user " dynamically adds " multicast of F.F. or rewind down file, and, the average latency of user FF operation will be reduced because some data of user buffering district can cushion the needs of FF.Can not distinguish type during the recovery normal play of four kinds of VCR operation,, then directly add,, all requests " dynamically be added " according to the order of sequence if a multicast data flow is set up in not just queuing together afterwards if suitable multicast data flow is arranged.For a small amount of VCR request that does not fall into the big movie section, still, set up unicast stream according in the past strategy, seek suitable multicast data flow when recovering to play and add or set up new multicast data flow.Comprehensive angle is seen, has reduced the number of required stream.
The invention overall process is illustrated in figures 1 and 2, the VOD system can realize guaranteeing that with flow process shown in Figure 1 the user plays the stream scheduling process that can not interrupt, and the VCR that provides operation can be on original system, adopt flow process shown in Figure 2 to generate a VCR operational module, call and to realize for original system.
Embodiment 2:
As Fig. 3, Fig. 4 and shown in Figure 5, network multicast tree performance VOD method, timeslice performance multicast VCR process.Adopt identical hypothesis with embodiment 1.
Illustrate that node adition process and playout-delay calculate, as shown in Figure 3.Multicast tree such as Fig. 3 a have been set up in the VOD system, there are this moment user X and Y request to add, request is dealt into video server S place, the X desired data can obtain on A, Y needs data can obtain on D, S makes X connect user A and obtains data according to the data of their needs, and Y connects user D and obtains data.According to the media stream scheduling method that proposes, in user's adition process, the user's of close root node playout-delay can be less, increases playout-delay step by step, and the playout-delay maximum of leaf node.In Fig. 3 b, represented in the node adition process, the difference that the newly added node reproduction time postpones, the sign on each node next door is represented the playout-delay of that node.Calculate by video server for playout-delay, guarantee t1 〉=0, t2 〉=0 and t3 〉=0, t1+t2+t3 〉=t1+t2 〉=t1 like this, t1 can be 0, or very little value, response time length decision according to video server, the probability that leaves simultaneously according to a plurality of nodes reduces this rule gradually then, make t2 〉=t3, and to establish on the path simultaneously probability that three nodes leave be that to rebuild the required time when leaving be t to 0, one node, make t1+t2 〉=t, under above these prerequisites, set t1, t2, t3.Then, X inserts A and begins to get access to data, in the time of t1+t2 length, and the data that buffer memory is received, but do not play, same, Y inserts D and begins to get access to data, in the time of t1+t2+t3 length, and the data that buffer memory is received, but do not play.Playout-delay is after the time, normal play, and User Status is stable.And according to hypothesis, if there is node to add A and B again, playout-delay all is t1+t2, has node to insert Y, X, C and D again, and playout-delay all is t1+t2+t3, and inserting the darker node playout-delay of the degree of depth all is t1+t2+t3.
The process that non-leaf node leaves is described, as shown in Figure 4.If non-leaf node leaves, affected node all is his downstream site, is to set up good multicast tree as a among Fig. 4.With t (t ') represent each node at that time the broadcast time-delay and buffering area in guarantee to play continuously essential data, t is for playing time-delay, t ' expression buffer data can be play the t ' unit interval, root node with tree is a reference point, what then establish root node is 0 (0), and other nodes are shown in a among Fig. 4.B represents that a node leaves for a certain reason among Fig. 4.Suppose that rebuilding the multicast tree required time is t, transmission rate is identical with playback rate.Then affected node has four, leave from his superior node, the user no longer receives new data, broadcast nodes adds the data that the playout-delay time internal buffer of fashionable introducing stores, and rebuilding multicast tree, to need reproduction time be a section of t, and reducing reproduction time in the buffering area is the data of t, as shown in Fig. 4 c, after rebuilding multicast tree, as d among Fig. 4, the tissue of this multicast data flow and scheduling are calculated by server and are finished.Suppose according to bandwidth needs time t " long-time transmission plays t+t " data for a long time, then multicast data flow is by t " elementary streams and the data flow that is connected the normal quality of elementary streams tail data are formed for a long time.During this section of transmission elementary streams, there is not affected node that the own existing played data of transmitting in the newly-built multicast is abandoned, play the data in the own buffering area, all subscriber's main stations are from adding the stable back of multicast tree like this, have only a stream on the link, and a node receives only a multicast data flow, the user buffering district only needs two logic partitionings, the data that storage is just being play, a receiving group stream.
Multicast processing VCR process is described, as shown in Figure 5.All users watch that a little differ not can overtime slot length and playout-delay sum in the multicast group, and can be than higher to the program request probability of the popular fragment in the silver screen hits.As shown in Figure 5, for the program request that is the fragment of T of a certain period, from 0 constantly, in length is the time of t, the program request starting point of all VCR operations may be incomplete same, 1-5 is the request sequence number by the time, a-e is according to the time series behind five request broadcast point time-sequencings, request 1 requires to begin to play from the position that this section c points to, request 2 requires to begin (a place) from this section and plays, request 3 requires to begin to play from the position that this section e points to, request 4 requires to begin to play from the position that this section b points to, request 5 requires to begin to play from the position that this section d points to, and all requests beginning broadcast point on request to this section in is during this period of time sorted, i.e. 2-4-1-5-3, t sets up multicast data flow in end point, the data that transmission begins from this section, and notify the user to line up to the program request point of this section and when " dynamically add " multicast group according to the user, as Fig. 3.The time interval of unified expression point-to-point transmission is t between the request 1 and 2
12, the rest may be inferred, and adding between some a and the b is t
Ab, the rest may be inferred, and so, the stand-by period of request 1 is: t
15+ t
Ac=t+t
AcThe stand-by period of request 2 is: t
25The stand-by period of request 3 is: t
35+ t
Ae=t
35+ T; The stand-by period of request 4 is: t
45+ t
AbThe stand-by period of request 5 is: t
AdAs seen, request time more near t constantly, and the approaching more section head of request broadcast point, stand-by period is short more, so if according to the program request rate that priori data provided files in stream media is cut apart, will the section of concentrating on head to certain section program request, time slot can be very short like this, relative request time is near the t moment, and then the stand-by period of all program requests all can be very short, also saved server and Internet resources simultaneously.Sending ending place of data,, continuing to send one piece of data down,, will discharge this multicast data flow along with leaving of last user if the user withdraws from multicast data flow gradually if also have the user to be positioned at multicast data flow near this section fragment.
Claims (9)
1. a cover network multicasting is realized the method for video request program down, and its feature has following steps:
Step (1) is put sowing time first to a certain video frequency program, and video server is set up a multicast data flow for the user at once;
Step (2), when the user asks same video, node adds fashionable, introduces different playout-delays, and the node playout-delay near from root node is little, and the node playout-delay far away from root node is big;
Step (3) when non-leaf node leaves, is rebuild multicast tree, and newly-built afterwards multicast data flow by the plays clip that the Delamination Transmission compensating technique loses, is play continuity with assurance; When leaf node leaves, can not impact, need not consider other nodes broadcasts;
Step (4) does not have node to add and during node leaves, keeps multicast data flow and normally transmit;
Step (5), realize the F.F. and the rewind down of VCR operation with multicast VCR method of operating, user VCR EO in the multicast VCR operational group, incorporate suitable multicast data flow into, the same step of adition process (2) when the user all leaves in the VCR operational group, discharges this VCR multicast data flow, suspend and reorientate operation and finish the back and when the recovery normal play, incorporate suitable multicast data flow, the same step of adition process (2) into;
Step (6) after the user of Video-on-demand all left, discharges multicast data flow.
2. a kind of cover network multicasting according to claim 1 is realized the method for video request program down, it is characterized in that: the method for calculating playout-delay is to determine that according to network condition different depth node a plurality of nodes to the root node path leave the probability of influence, the needed playout-delay of depth calculation according to the node access, arrive the node of certain depth, playout-delay converges to fixed value.
3. a kind of cover network multicasting according to claim 1 is realized the method for video request program down, it is characterized in that: after non-leaf node leaves, data in the affected node play buffer, and incoming multicast is set again, after link is connected, rebuilds multicast data flow, data from non-leaf node departure time positive transmission, with the Media Stream of low frame per second, replenish the data that affected node loses fast in reconnecting process, uninfluenced node abandons repeating data.
4. a kind of cover network multicasting according to claim 1 is realized the method for video request program down, the F.F. and the rewind down of multicast VCR operation, it is characterized in that: in advance to the files in stream media of video, according to F.F., the segmentation of fast reverse operation record, be divided into one section with carrying out the frequent fragment of identical VCR operation in a short time, the F.F., the fast reverse operation request multicast that fall into same section for the short time in user's on-demand process are handled, and notify the user by the queuing of request broadcast point, dynamically add multicast data flow.
5. a cover network multicasting is realized the method for video request program down, and its feature has following main step:
Step (1), when the user asked, whether server had enough resources, if not, then promptly notified the user to ask failure;
Step (2) judges whether the request first to this video, if not, then changes the step when the user asks the same video frequency program of program request over to;
Step (3) is set up a multicast data flow;
Step (4) is kept the normal transmission of multicast data flow, and monitoring network and multicast member state, change the step of " when the user asks the same video frequency program of program request " over to if receive the request of the same video frequency program of user's program request; Leave if detected the user, change the step of " when user report is left or server when detecting the user and breaking away " over to; Want the VCR request of operating if receive the user, change the step of " when the user asks the VCR operation " over to; Want the request of pausing operation if receive the user, change the step of " when the user asks pausing operation " over to;
Step (5) judges whether that the node number in the multicast tree is zero, if not, then changes step (4) over to;
Step (6) discharges multicast data flow.
6. a kind of cover network multicasting according to claim 5 is realized the method for video request program down, it is characterized in that: the step when the user asks the same video frequency program of program request is arranged:
Step (1) judges whether in time slot, if not, then sets up a new multicast data flow;
Step (2) enters node adition process step, the Data Position that search subscriber is required, subscriber's main station positional information, the positional information of the node of user requested data;
Which node is step (3) enter according to multicast tree structures shape user;
Step (4) is given calculating playout-delay module with the node depth information that the user inserts, and obtains suitable playout-delay;
Step (5) notifies the user to receive data, and adopts corresponding playout-delay when playing; Change the step (4) of claim 5 afterwards over to.
7. a kind of cover network multicasting according to claim 5 is realized down the method for video request program, it is characterized in that: have when user report and leave or the step of server when detecting the user and breaking away:
Step (1) judges whether non-leaf node, if not, then changes the step (4) of claim 5 over to;
Step (2) determines to leave node location, and record leaves node location information, node is left positional information deliver to calculating playout-delay module, the step (4) of the claim 7 after the data point information of normal transmission was given when node left;
Step (3) is rebuild multicast tree, and multicast member information is sent into the step (4) of claim 7;
Step (4), the data point information of normal transmission is rebuild multicast data flow when calculating playout-delay that the playout-delay module calculates and node and leave, and loses data with the delamination propagation technique complementary, and uninfluenced user abandons repeating data;
Step (5) is recovered normal play; Change the step (4) of claim 5 afterwards over to.
8. a kind of cover network multicasting according to claim 5 is realized the method for video request program down, it is characterized in that: have when the user asks the VCR operation, step is as follows:
Step (1), the VCR request for receiving judges whether that server has enough resources, if not, then notifies the user to fail;
Step (2) judges whether the request broadcast point drops in the frequent fragment of VCR operation, if not, then sets up a unicast stream and is user's service;
Step (3) judges whether to drop in the same fragment, if not, then sets up new judgement process;
Step (4) is determined the VCR action type, then enters node adding program step if reorientate; Then change the pausing operation step over to if suspend;
Step (5) if select F.F. or rewind down, judges whether this operation is the F.F. or the fast reverse operation of first request, if, then begin the timing of a time slot, enter the step (6) of claim 8 afterwards; If not, directly enter the step (6) of claim 8;
Step (6) is lined up according to program request point;
Step (7) has judged whether the terminal point of time slot, if not, and the then end of stand-by period groove, if, then write down all program request point queueing messages, send into the step (9) of claim 8;
Step (8) is searched for required fragment, sets up the VCR multicast data flow, begins to send data from fragment;
Step (9) notifies the user to add the VCR multicast data flow successively;
Step (10) is kept the VCR multicast data flow;
Step (11), monitoring multicast VCR multicast member state has judged whether that the member leaves, and if not, then changes step (10) over to, if, then enter next step, and recording user leaves dot information, enter node and add program step;
Step (12) judges whether the member is zero in the VCR multicast data flow, if not, then changes claim 8 step (10) over to;
Step (13) discharges the VCR multicast data flow; Forward the key step (4) of claim 5 afterwards to.
9. a kind of cover network multicasting according to claim 8 is realized the method for video request program down, it is characterized in that step is as follows when the user asks pausing operation:
Step (1), the user buffering district continues to receive data;
Step (2) judges whether the user buffering district is full, if not, then changes claim 9 step (1) over to;
Step (3), the user stops to receive data;
Step (4) judges whether to recover to play, and if not, then changes claim 9 step (3) over to;
Step (5) enters node adition process step.
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| CN100477622C (en) * | 2006-06-28 | 2009-04-08 | 华中科技大学 | Circular node organizing method in reciprocal network request broadcast system |
| FR2907992A1 (en) * | 2006-10-30 | 2008-05-02 | Thomson Licensing Sas | Interrupted content downloading session i.e. video-on demand session, recovering method, for set-top box, involves recovering session when all channels are available, in response to session recovery request from remote server |
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| WO2010144833A2 (en) | 2009-06-12 | 2010-12-16 | Cygnus Broadband | Systems and methods for intelligent discard in a communication network |
| CN101710983B (en) * | 2009-11-24 | 2013-06-05 | 中兴通讯股份有限公司 | Method for playing real-time streaming files and device thereof |
| CN102714626B (en) * | 2010-06-28 | 2016-04-06 | 松下知识产权经营株式会社 | Communication terminal, communication means and integrated circuit |
| CN101931543A (en) * | 2010-09-03 | 2010-12-29 | 浙江大学 | Method for efficiently managing dynamic node based on overlay network multicast system |
| CN102035656A (en) * | 2010-09-03 | 2011-04-27 | 浙江大学 | Method for realizing multicast system of overlay network based on agency |
| CN102546525B (en) * | 2010-12-07 | 2015-04-22 | 中国移动通信集团公司 | Multimedia content distribution method, multimedia content distribution system and multimedia content distribution device |
| KR102044001B1 (en) * | 2012-10-19 | 2019-11-12 | 한국전자통신연구원 | multicast and unicast mixed streaming apparatus and method for mobile IPTV service |
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