CN109121020A - For the dynamic buffering dispatching method of SVC-DASH VOD system, equipment and storage equipment - Google Patents
For the dynamic buffering dispatching method of SVC-DASH VOD system, equipment and storage equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
- H04N21/2401—Monitoring of the client buffer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/262—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists
- H04N21/26208—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists the scheduling operation being performed under constraints
- H04N21/26216—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists the scheduling operation being performed under constraints involving the channel capacity, e.g. network bandwidth
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4335—Housekeeping operations, e.g. prioritizing content for deletion because of storage space restrictions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
- H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
Abstract
The present invention provides for the dynamic buffering dispatching method of SVC-DASH VOD system, equipment and storage equipment, its method includes: laterally stacked to fragment progress inside dynamic spatial cache, it realizes better program request effect, solves adverse effect of the network quality frequent fluctuation to user's viewing experience in heterogeneous network；The model asked for using fragment by layer, the fluency and smoothness of video playing are improved, while dynamic buffering mechanism is added, accelerates the promotion speed of video quality, and the fault-tolerance by increasing scheduling and the utilization rate for promoting bandwidth, further promote the smoothness of video quality.For the dynamic buffering controlling equipment and storage equipment of SVC-DASH VOD system, for realizing the dynamic buffering dispatching method for SVC-DASH VOD system.The beneficial effects of the present invention are: technical solution of the present invention has better performance in terms of the smoothness of the promotion speed of quality, the average rank of quality, video playing fluency and play quality compared with existing SVC-DASH dispatching method.
Description
Technical field
The present invention relates to audiovisual applications fields, more particularly, to the dynamic buffering dispatching party of SVC-DASH VOD system
Method, equipment and storage equipment.
Background technique
Nowadays, the distribution and transmission of Web content are significant increases, and wherein video content occupies significant proportion.
Predict that, by 2021, annual global IP flow is up to 3.3ZB, and video flow will occupy according to Cisco VNI (Cisco VNI)
82% ratio, occupies leading position.In terms of the transmission of video, in face of the isomerism of terminal and network, it would be desirable to be directed to
The network of different equipment and variation provides the video of different quality.HTTP adaptive code stream (HAS) technology is come into being, client
End can select the video slicing of different quality according to own situation, and a member of DASH as HAS, by many excellent of oneself
Gesture has been developed as current state-of-the-art video flowing communications.Simultaneously as H.264/SVC (scalable video
Coding server storage) can be greatly saved, and possesses more flexible shaping modes, in recent years more and more
SVC-DASH scheme is suggested.
However, some problems still have, for example it will appear video quality in the network environment of frequent fluctuation and frequently cut
Phenomena such as video breaks is changed or even occurred, user's viewing experience is seriously affected.Existing SVC-DASH solution is logical mostly
It crosses bandwidth prediction or simple laterally stacked adjusts video quality.The present invention provides a kind of dynamics based on SVC-DASH
Buffer scheduling method.To cope with negative effect of the frequent shake of bandwidth to video quality, while being directed to existing SVC-DASH
Deficiency existing for solution is further to be improved.
Summary of the invention
To solve the above-mentioned problems, the present invention provides for SVC-DASH VOD system dynamic buffering dispatching method,
Equipment and storage equipment are mainly comprised the steps that for the dynamic buffering dispatching method of SVC-DASH VOD system
S101: the video source of SVC format is obtained, video source is uniformly separated into n video slicing；And according to video source
Each video slicing is uniformly separated into m video block by quality level, and m video block of each video slicing is stacked into m
Layer, and all video blocks are stored in server；Each video block is corresponding with a fragment i and a sequence j；Its
In, m and n are the integer more than or equal to 1；The value range of i is [1, n], and the value range of j is [1, m]；Initialize i's and j
Value is 1；
S102: initialization buffer area parameter: the variation range of buffer area height Lmax is set as [1, m], sets buffer area
The variation range of length Bmax is [min, max], and it is highly the rectangle region of Lmax that the Buffer size of buffer area, which is that length is Bmax,
Domain；The value for initializing Lmax is m, and the value of Bmax is max；Buffer area is divided into Lmax*Bmax memory block, these memory blocks
According to coordinate [1,1], [1,2] ... [1, Bmax], [2,1] ... [2, Bmax] ... [Lmax, Bmax] sequential, for storing
State video block；
S103: downloading slicing number is i, the video block of layer serial number j to first empty memory block,
S104: after the downloading for completing the video block, buffer area buffer status data and average network bandwidth are updated
avgBW；The buffer status data include the newest view being downloaded in the downloading number and buffer area of each layer video block of buffer area
The fragment number of frequency block；
S105: buffer area height Lmax is adjusted according to average bandwidth avgBW；
S106: section length Bmax is cached according to buffer status data point reuse；
S107: judge whether that downloading terminates or videoconference client is closed；If so, arriving step S109；If it is not, then arriving
Step S108；
S108: traversing all memory blocks of buffer area, first empty memory block is searched, according to buffer area buffer status number
According to the fragment i and sequence j of the next video block being downloaded of determination；Back to step S103；
S109: terminating caching program, completes dynamic buffering scheduling.
Further, in the step S105, the specific of buffer area height Lmax is adjusted according to averaging network bandwidth avgBW
Step are as follows:
S201: judge whether averaging network bandwidth avgBW is more than or equal to the code rate Q of -1 layer video of kthk-1；If so, slow
The value for depositing area height Lmax is k；If it is not, then arriving step S202；Wherein, k is integer, and value range is [1, m], and k's is initial
Value is maximized m；
S202: being updated to k-1 for k, judges whether k is 1；If so, the value of buffer area height Lmax is 1；If it is not, then returning
Return step S201；
Further, in the step S106, the specific steps of section length Bmax are cached according to buffer status data point reuse
Are as follows:
S301: Rule of judgment Bmax > buf fer_len1>=min and buf fer_lenLmax<buf fer_len1It is whether same
Shi Chengli；If so, Bmax is updated to Bmax-1；If it is not, then arriving step S302；Wherein, buf fer_len1For buffer area
In the 1st layer video block downloading number, buf fer_lenLmaxFor the downloading number of the top video block of buffer area；
S302: Rule of judgment Bmax=buf fer_len1< max and buf fer_lenLmax=buf fer_len1Whether
It sets up simultaneously；If so, Bmax is updated to Bmax+1；If it is not, then Bmax value is constant.
Further, in the step S108, according to buffer area height Lmax, caching section length Bmax and buffer status tune
The specific steps of fragment i and sequence j corresponding to whole next video block being downloaded are as follows:
S401: judging whether buffer area has the layer of remaining memory block, judges since buffer area first layer, and order judges the number of plies
P=1；
S402: judge whether p is less than or equal to Lmax；If so, arriving step S403；If it is not, then arriving step S406；
S403: judge the whether free remaining memory block of pth layer in buffer area；If so, arriving step S405；If it is not, then arriving step
Rapid S404；
S404: p is updated to p+1, return step S402；
S405: sequence j is assigned a value of p, judges whether pth layer has video block；If so, i is equal to the newest downloading of pth layer
Video block fragment number plus 1；If it is not, then i is equal to first fragment number of the 1st floor of buffer area；
S406: whether the fragment number for judging the last one video block of buffer area first layer is n；If so, terminating downloading；If
It is no, then arrive step S407；
S407: download thread is hung up, and the lower No.1 that i is the 1st floor the last one fragment number of buffer area, sequence number is arranged
J is 1；It loops to determine whether buffer area vacant memory block occurs, once there is vacant memory block, then continues to download；It is regarded in caching
While frequency division piece, decoding plays thread and lasting taking-up video slicing to the client from buffer area is decoded broadcasting, often
When taking a video slicing away, remaining video slicing successively moves forward in buffer area.
A kind of storage equipment, the storage equipment store instruction and data are for realizing for SVC-DASH VOD system
Dynamic buffering dispatching method.
Dynamic buffering controlling equipment for SVC-DASH VOD system, comprising: processor and the storage equipment；It is described
Processor loads and executes the instruction in the storage equipment and data for realizing the dynamic for SVC-DASH VOD system
Buffer scheduling method.
Technical solution provided by the invention has the benefit that compared with existing SVC-DASH dispatching method, this
The technical solution of invention is in the flat of the promotion speed of quality, the average rank of quality, video playing fluency and play quality
There is better performance in terms of stability.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the flow chart in the embodiment of the present invention for the dynamic buffering dispatching method of SVC-DASH VOD system；
Fig. 2 is the schematic diagram of video cache section model in the embodiment of the present invention；
Fig. 3 is the detailed process in the embodiment of the present invention for the dynamic buffering dispatching method of SVC-DASH VOD system
Figure；
Fig. 4 is the schematic diagram of video cache section model 1 in the embodiment of the present invention；
Fig. 5 is the schematic diagram of video cache section model 2 in the embodiment of the present invention；
Fig. 6 is the schematic diagram of video cache section model 3 in the embodiment of the present invention；
Fig. 7 is the schematic diagram of video cache section model 4 in the embodiment of the present invention；
Fig. 8 is the schematic diagram of video cache section model 5 in the embodiment of the present invention；
Fig. 9 is the schematic diagram that hardware device works in the embodiment of the present invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
The embodiment provides dynamic buffering dispatching method, equipment and the storages for SVC-DASH VOD system
Equipment is used for video cache section model shown in Fig. 2.
Referring to FIG. 1, Fig. 1 is the dynamic buffering dispatching method for being used for SVC-DASH VOD system in the embodiment of the present invention
Flow chart specifically comprises the following steps:
S101: the video source of SVC format is obtained, video source is uniformly separated into n video slicing；And according to video source
Each video slicing is uniformly separated into m video block by quality level, and m video block of each video slicing is stacked into m
Layer, and all video blocks are stored in server；Each video block is corresponding with a fragment i and a sequence j；Its
In, m and n are the integer more than or equal to 1；The value range of i is [1, n], and the value range of j is [1, m]；Initialize i's and j
Value is 1；
S102: initialization buffer area parameter: the variation range of buffer area height Lmax is set as [1, m], sets buffer area
The variation range of length Bmax is [min, max], and it is highly the rectangle region of Lmax that the Buffer size of buffer area, which is that length is Bmax,
Domain；The value for initializing Lmax is m, and the value of Bmax is max；Buffer area is divided into Lmax*Bmax memory block, these memory blocks
According to coordinate [1,1], [1,2] ... [1, Bmax], [2,1] ... [2, Bmax] ... [Lmax, Bmax] sequential, for storing
State video block；Wherein, [1,1], [2,1] ... [Bmax, 1] are buffer area first layer, and [1,2], [2,2] ... [Bmax, 2] is caching
Area's second layer, [1, j], [2, j] ... [Bmax, j] are buffer area jth layer, and [1, Lmax], [2, Lmax] ... [Bmax, Lmax] are
Lmax layers of buffer area；
S103: downloading slicing number is i, the video block of layer serial number j to first empty memory block,
S104: after the downloading for completing the video block, buffer area buffer status data and average network bandwidth are updated
avgBW；The buffer status data include the newest view being downloaded in the downloading number and buffer area of each layer video block of buffer area
The fragment number of frequency block；
S105: buffer area height Lmax is adjusted according to average bandwidth avgBW；
S106: section length Bmax is cached according to buffer status data point reuse；
S107: judge whether that downloading terminates or videoconference client is closed；If so, arriving step S109；If it is not, then arriving
Step S108；
S108: traversing all memory blocks of buffer area, first empty memory block is searched, according to buffer area buffer status number
According to the fragment i and sequence j of the next video block being downloaded of determination；Back to step S103；
S109: terminating caching program, completes dynamic buffering scheduling.
In the step S105, the specific steps of buffer area height Lmax are adjusted according to averaging network bandwidth avgBW are as follows:
S201: judge whether averaging network bandwidth avgBW is more than or equal to the code rate Q of -1 layer video of kthk-1；If so, slow
The value for depositing area height Lmax is k；If it is not, then arriving step S202；Wherein, k is integer, and value range is [1, m], and k's is initial
Value is maximized m；
S202: being updated to k-1 for k, judges whether k is 1；If so, the value of buffer area height Lmax is 1；If it is not, then returning
Return step S201；
In the step S106, the specific steps of section length Bmax are cached according to buffer status data point reuse are as follows:
S301: Rule of judgment Bmax > buf fer_len1>=min and buf fer_lenLmax<buf fer_len1It is whether same
Shi Chengli；If so, Bmax is updated to Bmax-1；If it is not, then arriving step S302；Wherein, buf fer_len1For buffer area
In the 1st layer video block downloading number, buf fer_lenLmaxFor the downloading number of the top video block of buffer area；
S302: Rule of judgment Bmax=buf fer_len1< max and buf fer_lenLmax=buf fer_len1Whether
It sets up simultaneously；If so, Bmax is updated to Bmax+1；If it is not, then Bmax value is constant.
In the step S108, the fragment i of next video block being downloaded is determined according to first empty memory block
The step of with sequence j are as follows:
S401: judging whether buffer area has the layer of remaining memory block, judges since buffer area first layer, and order judges the number of plies
P=1；
S402: judge whether p is less than or equal to Lmax；If so, arriving step S403；If it is not, then arriving step S406；
S403: judge the whether free remaining memory block of pth layer in buffer area；If so, arriving step S405；If it is not, then arriving step
Rapid S404；
S404: p is updated to p+1, return step S402；
S405: sequence j is assigned a value of p, judges whether pth layer has video block；If so, i is equal to the newest downloading of pth layer
Video block fragment number plus 1；If it is not, then i is equal to first fragment number of the 1st floor of buffer area；
S406: whether the fragment number for judging the last one video block of buffer area first layer is n；If so, terminating downloading；If
It is no, then arrive step S407；
S407: download thread is hung up, and the lower No.1 that i is the 1st floor the last one fragment number of buffer area, sequence number is arranged
J is 1；It loops to determine whether buffer area vacant memory block occurs, once there is vacant memory block, then continues to download；It is regarded in caching
While frequency division piece, decoding plays thread and lasting taking-up video slicing to the client from buffer area is decoded broadcasting, often
When taking a video slicing away, remaining video slicing successively moves forward in buffer area.
It is illustrated in figure 3 in the embodiment of the present invention for the detailed of the dynamic buffering dispatching method of SVC-DASH VOD system
Thin flow chart presents the implementing procedure of entire dynamic buffering dispatching method, the explanation of each variable corresponding with Fig. 3 such as 1 institute of table
Show:
1 argument table 1 of table
| I (1~n) | Video block fragment number |
| J (1~m) | Video block sequence number |
| Lmax (1~m) | Buffer area height |
| Bmax (min~max) | Cache section length |
| Qk(1≤k≤m) | The code rate of kth layer video |
| buffer_lenp(1≤p≤m) | The number of buffer area pth layer video block downloading |
| last_idq(1≤q≤n) | The newest video slicing number of buffer area q floor |
| avgBW | Averaging network bandwidth |
Basic thought is: successively downloading backward since Primary layer (the 1st layer of buffer area), when all video slicings in caching
Primary layer filling finish, then fill the first enhancement layer (the 2nd layer of buffer area), and so on, with the stacking of enhancement layer, depending on
Frequency quality is constantly promoted, until reaching video quality highest level.At the same time, it is limited in buffer area and is stacked according to recent bandwidth
Maximum level (buffer area height).(corresponding with video slicing) is arranged when sky occurs in buffer area, and there are also unfilled for front
High-rise fragment, if buffer storage length does not arrive minimum value, caching shortens, such as Fig. 4.When buffer area fills up, and buffer storage length does not reach most
Big value, caching is elongated, such as Fig. 5.Variable meaning in each figure is as shown in table 2.
2 argument table 2 of table
| Seg id | Buffer area fragment number |
| Layer id | Buffer area sequence number |
| Bmax | Cache section length |
| Lmax | Buffer area height |
| Dynamic Area | Dynamic range |
| Decoding | Decode broadcast area |
| Buffering | Buffer area |
In such a way that sequence stacks, Caton phenomenon can be effectively reduced, while quality switching frequency is greatly reduced.Separately
Outside, due to introducing dynamic buffering and level limitation, compared to simple stacking (WQUAD), method of the invention (LSDC) is excellent
Gesture is mainly reflected in two o'clock:
(1) fast lifting quality
T0 indicate downloading starts, at this time buffer area be sky, tp indicate download thread start after p-th of fragment duration, depending on
Number in frequency block represents it and is downloaded in which fragment duration.Assuming that hereafter bandwidth is 4 video blocks/fragment duration.?
In WQUAD, caching section length remains unchanged (15), and in LSDC, 15 when buffer length is from t1 are compressed to 5 when t4, then
The 15 of t37 is reverted to by 33 fragment durations.From fig. 6 it can be seen that WQUAD quality in the 13rd fragment mentions highest
Layer, and be just promoted in LSDC in the 4th fragment top.This is because in LSDC, one video block of every downloading, buffer area
Length adaptively adjusts, and fills buffer area high level in advance by compressed cache section length in early period, fast lifting quality is (when one
After the first layer video block of video slicing is downloaded, this video slicing can be played, under the video block of a video slicing
What is carried is more, then the video playing quality of this video slicing is higher), slowly expand caching section length after buffer area fills up,
Maximum length is recovered after the 37th fragment duration.WQUAD has just reached saturation before the 37th fragment duration, behind it is more
Remaining bandwidth wastes, and is equivalent to and pays the excess bandwidth in later period in advance and promote quality in advance.
(2) fault-tolerance is improved
In process of caching, if buffer area is filled at a certain moment, it is assumed that be at this time t0.Network fluctuates, bandwidth drop
As low as 2 video blocks/fragment duration, promoted later to 4 video blocks/fragment duration.Fig. 7 is the filling feelings of preceding 15 fragment durations
Condition, it can be seen from figure 7 that subsequent fragment column are all stacked to the second layer by WQUAD, and LSDC passes through the compressed cache head of district
Degree, maintains Lmax for quality.After 15 fragment durations, the decline of credit rating will occur in WQUAD, and LSDC is kept not
Become.In t31, LSDC buffer area compresses in length to the limit loses regulating power, starts the stacking mode as WQUAD,
It is equivalent to the WQUAD of a compressed version.If hereafter bandwidth is gone up, LSDC will gradually expand caching section length, until reduction.From
If LSDC fills rapidly buffer area high level video block as can be seen that bandwidth is promoted in t31 in Fig. 8, then gradually expand caching
Section length recovers the caching section length of compression when to t46, remain at the grade of Lmax in the process, and WQUAD is then
The grade decline that experienced 20 fragments, in the 21st broadcasting fragment ability rise quality, so LSDC has effectively evaded bandwidth
Fluctuation.
By comparing with existing dispatching method, technical solution of the present invention is (flat under four kinds of different network environments
Surely, gradual change, mutation, shake), scheduling strategy increased quality speed, average video quality and video playing fluency and
Have in terms of smoothness and well even preferably shows.
Fig. 9 is referred to, Fig. 9 is the hardware device operation schematic diagram of the embodiment of the present invention, and the hardware device specifically includes:
For the dynamic buffering controlling equipment 901 of SVC-DASH VOD system, processor 902 and storage equipment 903.
Dynamic buffering controlling equipment 901 for SVC-DASH VOD system: described for SVC-DASH VOD system
Dynamic buffering controlling equipment 901 realizes the dynamic buffering dispatching method for being used for SVC-DASH VOD system.
Processor 902: the processor 902 loads and executes the instruction in the storage equipment 903 and data for real
The existing dynamic buffering dispatching method for being used for SVC-DASH VOD system.
Store equipment 903: 903 store instruction of storage equipment and data；The storage equipment 903 is for realizing described
Dynamic buffering dispatching method for SVC-DASH VOD system.
The beneficial effects of the present invention are: technical solution of the present invention is in matter compared with existing SVC-DASH dispatching method
The promotion speed of amount, the average rank of quality, video playing fluency and play quality smoothness in terms of have preferably
Performance.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. being used for the dynamic buffering dispatching method of SVC-DASH VOD system, it is characterised in that: the following steps are included:
S101: the video source of SVC format is obtained, video source is uniformly separated into n video slicing；And according to the quality of video source
Each video slicing is uniformly separated into m video block by level, and m video block of each video slicing is stacked into m layers,
And all video blocks are stored in server；Each video block is corresponding with a fragment i and a sequence j；Wherein,
M and n is the integer more than or equal to 1；The value range of i is [1, n], and the value range of j is [1, m]；Initialize the value of i and j
It is 1；
S102: initialization buffer area parameter: the variation range of buffer area height Lmax is set as [1, m], setting caches section length
The variation range of Bmax is [min, max], and it is highly the rectangular area of Lmax that the Buffer size of buffer area, which is that length is Bmax,；
The value for initializing Lmax is m, and the value of Bmax is max；Buffer area is divided into Lmax*Bmax memory block, these memory blocks are pressed
It is described for storing according to coordinate [1,1], [1,2] ... [1, Bmax], [2,1] ... [2, Bmax] ... [Lmax, Bmax] sequential
Video block；Wherein, [1,1], [2,1] ... [Bmax, 1] are buffer area first layer, and [1,2], [2,2] ... [Bmax, 2] is buffer area
The second layer, [1, j], [2, j] ... [Bmax, j] are buffer area jth layer, and [1, Lmax], [2, Lmax] ... [Bmax, Lmax] are slow
Deposit area's Lmax floor；
S103: downloading slicing number is i, the video block of layer serial number j to first empty memory block,
S104: after the downloading for completing the video block, buffer area buffer status data and average network bandwidth avgBW are updated；Institute
State point of the newest video block being downloaded in the downloading number and buffer area that buffer status data include each layer video block of buffer area
Piece number；
S105: buffer area height Lmax is adjusted according to average bandwidth avgBW；
S106: section length Bmax is cached according to buffer status data point reuse；
S107: judge whether that downloading terminates or videoconference client is closed；If so, arriving step S109；If it is not, then arriving step
S108；
S108: traversing all memory blocks of buffer area, searches first empty memory block, true according to buffer area buffer status data
The fragment i and sequence j of fixed next video block being downloaded；Back to step S103；
S109: terminating caching program, completes dynamic buffering scheduling.
2. being used for the dynamic buffering dispatching method of SVC-DASH VOD system as described in claim 1, it is characterised in that: in step
In rapid S105, the specific steps of buffer area height Lmax are adjusted according to averaging network bandwidth avgBW are as follows:
S201: judge whether averaging network bandwidth avgBW is more than or equal to the code rate Q of -1 layer video of kthk-1；If so, buffer area
The value of height Lmax is k；If it is not, then arriving step S202；Wherein, k is integer, and value range is [1, m], and the initial value of k takes
Maximum value m；
S202: being updated to k-1 for k, judges whether k is 1；If so, the value of buffer area height Lmax is 1；If it is not, then returning to step
Rapid S201.
3. being used for the dynamic buffering dispatching method of SVC-DASH VOD system as described in claim 1, it is characterised in that: in step
In rapid S106, the specific steps of section length Bmax are cached according to buffer status data point reuse are as follows:
S301: Rule of judgment Bmax > buffer_len1>=min and buffer_lenLmax<buffer_len1Whether set up simultaneously；
If so, Bmax is updated to Bmax-1；If it is not, then arriving step S302；Wherein, buffer_len1For the 1st layer of view in buffer area
The downloading number of frequency block, buffer_lenLmaxFor the downloading number of the top video block of buffer area；
S302: Rule of judgment Bmax=buffer_len1< max and buffer_lenLmax=buffer_len1Whether simultaneously at
It is vertical；If so, Bmax is updated to Bmax+1；If it is not, then Bmax value is constant.
4. being used for the dynamic buffering dispatching method of SVC-DASH VOD system as described in claim 1, it is characterised in that: in step
In rapid S108, the step of fragment i and sequence j of next video block being downloaded are determined according to first empty memory block
Are as follows:
S401: judging whether buffer area has the layer of remaining memory block, judges since buffer area first layer, and order judges number of plies p=
1；
S402: judge whether p is less than or equal to Lmax；If so, arriving step S403；If it is not, then arriving step S406；
S403: judge the whether free remaining memory block of pth layer in buffer area；If so, arriving step S405；If it is not, then arriving step
S404；
S404: p is updated to p+1, return step S402；
S405: sequence j is assigned a value of p, judges whether pth layer has video block；If so, i is equal to the view of the newest downloading of pth layer
The fragment number of frequency block plus 1；If it is not, then i is equal to first fragment number of the 1st floor of buffer area；
S406: whether the fragment number for judging the last one video block of buffer area first layer is n；If so, terminating downloading；If it is not,
Then arrive step S407；
S407: download thread is hung up, and the lower No.1 that i is the 1st floor the last one fragment number of buffer area is arranged, and sequence j is
1；It loops to determine whether buffer area vacant memory block occurs, once there is vacant memory block, then continues to download；In buffered video point
While piece, decoding plays thread and lasting taking-up video slicing to the client from buffer area is decoded broadcasting, Mei Dangqu
A video slicing is walked, remaining video slicing successively moves forward in buffer area.
5. a kind of storage equipment, it is characterised in that: the storage equipment store instruction and data are for realizing Claims 1 to 4
Any dynamic buffering dispatching method for being used for SVC-DASH VOD system.
6. being used for the dynamic buffering controlling equipment of SVC-DASH VOD system, it is characterised in that: include: processor and claim
Storage equipment described in 5；The processor loads and executes instruction and data in the storage equipment and wants for realizing right
The dynamic buffering dispatching method that any one is used for SVC-DASH VOD system described in asking 1~4.
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