CN109819336A - Method and system for downloading fragments based on size of play cache - Google Patents
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Abstract
The invention discloses a method and a system for downloading in a slicing mode based on the size of a playing cache, which are used for downloading video data required by playing a video in a slicing mode, regularly detecting the playable time length of the playing cache when the video data required by each current slicing is downloaded, and selecting an available downloading source with higher downloading speed as a downloading source of the next slicing if the playable time length of the playing cache is smaller than a first threshold; and if the playable time length of the play cache is greater than a second threshold value, selecting an available download source with lower bandwidth price as a download source of the next fragment, wherein the second threshold value is greater than the first threshold value. The method and the device can effectively reduce errors, reduce the playing pause chance and reduce the bandwidth cost, thereby improving the watching experience of the internet video on demand and improving the user viscosity of the video platform.
Description
Technical field
The present invention relates to internet video program request technologies, and in particular to a kind of based on the side for playing the downloading of cache size fragment
Method and system.
Background technique
Currently, internet video program request is substantially http on-demand request, format mainly has mp4 and two kinds of hls.Conventional
On-demand request, by way of the get of http/https request, to fringe node or the fringe node request data of cdn manufacturer,
In a http on-demand process, data source only one can only be by retrying or hand when network failure occurs or playing abnormal
It is dynamic to be switched to other nodes and just can solve, viewing experience is affected, video platform usage rate of the user is directly influenced.
Summary of the invention
The technical problem to be solved in the present invention: it in view of the above problems in the prior art, provides a kind of big based on caching is played
The method and system of small fragment downloading.The present invention can be effectively reduced mistake, reduce broadcasting Caton chance, reduce bandwidth expense,
To promote the viewing experience of internet video program request, the usage rate of the user of video platform is promoted.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A method of based on the downloading of cache size fragment is played, implementation steps include: to be downloaded needed for playing video based on fragment
Video data, timing detection plays the playable duration of caching when the video data needed for downloading each current slice,
If the playable duration for playing caching is less than first threshold, select the higher available downloads source of downloading rate as next
The loading source of fragment；If the playable duration for playing caching is greater than second threshold, under selecting bandwidth price is lower can be used
Loading source of the load source as next fragment, the second threshold are bigger than first threshold.
Optionally, the loading source of the next fragment of switching further include: if the playable duration for playing caching is greater than
Third threshold value and it is less than second threshold, then is decided whether that the lower available downloads source of bandwidth price is selected to make according to preference strategy
For the loading source of next fragment, selected if preference strategy is price priority the lower available downloads source of bandwidth price as
The loading source of next fragment.
It optionally, further include selecting at least one not when the playable duration for playing caching is greater than second threshold
The unavailable loading source is revised as by the step of available downloads source is detected offline if detecting loading source recovery
Available downloads source.
Optionally, in described the step of being detected offline, do not restore yet if detecting the loading source, it can not by this
It is revised as thoroughly discarded, subsequent no longer being detected offline with loading source.
Optionally, the higher available downloads source of selection downloading rate specifically refers to the selection downloading speed from online queue
The higher available downloads source of rate is stored with all available downloads sources in the online queue and according under each loading source
Rate is carried to be ranked up；The lower available downloads source of selection bandwidth price specifically refers to select bandwidth valence from price queue
Lattice lower available downloads source is stored with all available downloads sources in the price queue and according to the band of each loading source
Wide price is ranked up；The selection carries out offline detection at least one unavailable loading source and specifically refers to from offline queue
Selection detects at least one unavailable loading source offline, and the offline queue is from being stored with all unavailable downloadings
Source.
Optionally, it is described line queue be to program request dispatch server issue on-demand request after according to program request dispatch service
Available downloads source and its downloading rate sequence in all loading sources of device return generate, and download needed for each current slice
Video data after according to complete downloading loading source state and speed of download update its sequence in online queue；
The price queue is that the loading source based on online queue increases or completes to update when reducing；Each current point of the downloading
The loading source of failure is deleted from online queue, price queue if encountering loading source failure when video data needed for piece
And offline queue is added.
Optionally, the loading source of next fragment is defaulted as when video data needed for described each current slice of downloading
It keeps identical as the loading source of current slice.
Optionally, the detailed step of video data needed for the downloading broadcasting video based on fragment includes:
1) player sends playing request to program request dispatch server, receives broadcast address, all loading sources, loading source of return
Price weight and video code rate；
2) player requests preference strategy to program request dispatch server, determines whether preference strategy is price priority；
3) returned according to all loading sources of return and program request dispatch server or local detection obtains or sheet
The downloading rate and presence of each loading source of ground record generate online loading source online according to downloading rate sequence
Queue generates price queue according to the price weight sequencing of loading source, and offline loading source is put into offline queue；
4) the fragment size of fragment size or setting default is set according to video code rate；
5) the fragment request queue for storing fragment request is established；
6) first fragment is requested according to the broadcast address of return, and fragment request uses http range request to obtain target
The information of video file size；
7) it creates the fragment request of first fragment and adds it in fragment request queue；
8) the acquisition of information target video file size returned according to first fragment, by target video file size divided by fragment
Size rounds up to obtain fragment total quantity again, and first fragment is as current slice；
9) video data needed for downloading current slice, if the failure of the loading source of current slice selection from online queue or
Other available downloads sources are selected in price queue and are switched to new available downloads source；
Player starts to play based on the video data that current slice returns, and timing detection plays the playable duration of caching to refer to
The loading source of fixed next fragment, defaults loading source of the available downloads source of current slice as next fragment；
Judge the fragment request that whether there is next fragment in fragment request queue, is asked if there is the fragment of next fragment
It asks, then the loading source specified for the loading source setting of next fragment；If there is no the fragment request of next fragment, then sentence
Whether the fixed fragment quantity created is equal to fragment total quantity, creates in fragment request queue if not equal to fragment total quantity
Build the fragment request of new next fragment and the loading source specified for the setting of the loading source of next fragment；If current slice
Required video data, which is downloaded, to be completed, then jumps execution step 10)；Otherwise continue to jump execution step 9)；
10) corresponding loading source is updated according to this downloading rate for completing downloading and is located at the position in online queue；
11) judge whether that downloading is completed in all fragments, if not yet completing downloading, selected in fragment request queue
Next fragment jumps execution step 9) as new current slice；Otherwise, terminate and exit.
The present invention also provides a kind of based on the system for playing the downloading of cache size fragment, including computer equipment, the meter
Calculate the step of machine equipment is programmed to perform the aforementioned method based on broadcasting cache size fragment downloading of the invention；Or the meter
It calculates to be stored on the storage medium of machine equipment and is programmed to perform the aforementioned side based on broadcasting cache size fragment downloading of the present invention
The computer program of method.
The present invention also provides a kind of computer readable storage medium, it is stored with and is compiled on the computer readable storage medium
Journey is to execute the aforementioned computer program based on the method for playing the downloading of cache size fragment of the present invention.
Compared to the prior art, the present invention has an advantage that the present invention by playing end group in fragment downloading broadcasting
Video data needed for video, video data needed for downloading broadcasting video based on fragment under existing video platform frame, from
And play end http on-demand request is converted into fragment request, can be to multiple sources or node requests data, when source or distribution
Fragment request can be switched to normal node requests data when node failure can effectively reduce error rate, work as downloading each
The loading source of the next fragment of exchange-column shift when video data needed for preceding fragment, when played data is cached it is small when, it is automatic to select
The higher node requests data of downloading rate is selected, Caton is reduced；It, can be more honest and cleaner to broadband when played data caches abundance
The node requests data of valence, overall reduction bandwidth expense.Therefore, the present invention can be effectively reduced mistake, reduce broadcasting Caton
Chance, reduction bandwidth expense promote the usage rate of the user of video platform to promote the viewing experience of internet video program request.
Detailed description of the invention
Fig. 1 is the basic procedure schematic diagram of present invention method.
Fig. 2 is the detailed process schematic diagram of present invention method.
Specific embodiment
As shown in Figure 1, implementation steps of the present embodiment based on the method for playing the downloading of cache size fragment include: to be based on dividing
Video data needed for piece downloading plays video, timing detection broadcasting when the video data needed for download each current slice
The playable duration of caching selects downloading rate is higher can if the playable duration for playing caching is less than first threshold
Use loading source as the loading source of next fragment；If the playable duration for playing caching is greater than second threshold, band is selected
Loading source of the wide lower available downloads source of price as next fragment, second threshold are bigger than first threshold.Wherein, the first threshold
Value is the critical value of Caton, may then play generation Caton lower than first threshold, first threshold is used for when played data is slow
When depositing too small, the higher node requests data of downloading rate is automatically selected, Caton is reduced；Second threshold is bigger one
In general value, second threshold keep itself and Caton relationship little since the time is relatively long by the setting of threshold value, but
It is bigger with the cost relation of reduction bandwidth, if current broadcasting caching is greater than second threshold, it can have bigger freedom
Degree reduces the cost of bandwidth to select the price to meet the available downloads source of preset condition.In the present embodiment, first threshold 2
Second, second threshold is 10 seconds, and other values can be set as needed in unquestionable those skilled in the art.It is periodically examined in the present embodiment
It surveys the playable duration for playing and caching to refer to every the playable duration of 1 second detection broadcasting caching, furthermore also can according to need
Other detection cycles are set.The playable duration for playing caching can be obtained according to the timestamp of video frame, will be currently playing
Video frame after the timestamp of most end video frame subtract the timestamp of currently playing video frame, can be obtained play caching can
Playing duration.
Unquestionably, when the selection higher available downloads source of downloading rate, according to the downloading rate of current slice loading source
Can determine all available downloads sources more higher than the downloading rate of current slice loading source as the first list to be selected, first to
Select the downloading rate of all loading sources in list higher than the downloading rate of current slice loading source, it on this basis can basis
It needs to select downloading rate highest in list to be selected or downloading rate time is high or downloading rate is minimum or downloading rate is more than
Preset threshold or random available downloads source.
Unquestionably, when the selection lower available downloads source of bandwidth price, according to the bandwidth price of current slice loading source
Can determine all available downloads sources more lower than the bandwidth price of current slice loading source as the second list to be selected, second to
Select the downloading rate of all loading sources in list lower than the bandwidth price of current slice loading source, it on this basis can basis
It needs to select bandwidth price minimum wherein or the low or bandwidth price highest of bandwidth price time or bandwidth price is lower than default threshold
Value or random available downloads source.More lower than the bandwidth price of current slice loading source all using aforesaid way selection
When available downloads source, it can not both consider downloading rate, the control effect of price is become apparent from this way；In addition it is also possible to root
It is selected according to needing to be based on downloading rate, such as the downloading for requiring the downloading rate of loading source to be not less than current slice loading source
Rate requires the difference of the downloading rate of loading source and the downloading rate of current slice loading source to be less than preset threshold etc., leads to
Aforesaid way is crossed, the influence of downloading rate can be also more or less considered while controlled price, to realize control valence
Lattice and the equilibrium for playing experience.
In the present embodiment, switch the loading source of next fragment further include: if the playable duration for playing caching is greater than
Third threshold value and it is less than second threshold, then is decided whether that the lower available downloads source of bandwidth price is selected to make according to preference strategy
For the loading source of next fragment, selected if preference strategy is price priority the lower available downloads source of bandwidth price as
The loading source of next fragment.Third threshold value is one between second threshold, second threshold value, and third threshold value is with respect to the
It is more sensitive for reducing the cost of bandwidth for two threshold values, but it may will affect fluency, it is therefore desirable to according to preferential
Strategy selects loading source of the lower available downloads source of bandwidth price as next fragment to decide whether to enable.The present embodiment
In, third threshold value is 5 seconds, and other values can be set as needed in unquestionable those skilled in the art.
It further include selecting at least one not when playing the playable duration of caching greater than second threshold in the present embodiment
The unavailable loading source is revised as by the step of available downloads source is detected offline if detecting loading source recovery
Available downloads source.Since the time of second threshold is longer (such as being 10 seconds in the present embodiment), it is next to can use the time
It is detected offline, to detect whether that unavailable loading source has reverted to available mode, improves available downloads source more
New efficiency.Be specially in the present embodiment select unavailable loading source the step of being detected offline with reduce time loss,
It economizes on resources, unquestionably, the unavailable loading source detected offline is more, then time and resource consumption are bigger.
In the step of the present embodiment is detected offline, do not restore yet if detecting the loading source, this is unavailable
Loading source is revised as thoroughly discarded, subsequent no longer being detected offline, that is to say, that if if a unavailable loading source even
It is continuous detect twice it is unavailable, then it is subsequent no longer to be detected offline, to economize on resources；But aforesaid way is only a kind of excellent
Mode is selected, unquestionably, can according to need that the detection times of unavailable loading source are arranged is more than just to carry out after specified threshold value
It is thoroughly discarded, or also can according to need in the frequent situation of loading source Comparison of Gardening Activities setting from being not thorough discarded and adopt
With being detected offline every time, these modes all more or less will cause the bandwidth and cpu resource of player or loading source
It occupies.
In the present embodiment, the higher available downloads source of downloading rate is selected to specifically refer to the selection downloading speed from online queue
The higher available downloads source of rate is stored with all available downloads sources in online queue and according to the downloading of each loading source speed
Rate is ranked up；The selection lower available downloads source of bandwidth price specifically refers to select bandwidth price lower from price queue
Available downloads source is stored with all available downloads sources in price queue and is arranged according to the bandwidth price of each loading source
Sequence；Selection carries out offline detection at least one unavailable loading source and specifically refers to select at least one not from offline queue
Available downloads source is detected offline, and offline queue is from being stored with all unavailable loading sources.By above-mentioned online queue, from
Line queue, price queue enable to the higher available downloads source of selection downloading rate and select bandwidth price is lower can
Temporary detecting is not needed when with loading source, so that setting is more efficient.
It should be noted that queue, offline queue, price queue can according to need and determined by node state manager online
When safeguard.In the present embodiment, in order to promoted online queue, offline queue, price queue three maintenance efficiency, touched using event
The mode of hair updates online queue, offline queue, price queue, specifically: online queue is to program request dispatch server
The available downloads source and its downloading rate issued in all loading sources returned after on-demand request according to program request dispatch server is arranged
Sequence generates, and after video data needed for downloading each current slice according to the state for the loading source for completing downloading and under
It carries speed and updates its sequence in online queue；Price queue is that the loading source based on online queue is complete when increasing or reducing
At update；When video data needed for downloading each current slice if encounter loading source failure if by the loading source of failure from
It is deleted in online queue, price queue and offline queue is added.By the above-mentioned means, can greatly improve online queue, from
The maintenance efficiency of line queue, price queue, so that the higher available downloads source of selection downloading rate and selection bandwidth price are more
Temporary detecting is not needed when low available downloads source, is arranged more efficient.
In the present embodiment, when video data needed for downloading each current slice the loading source of next fragment be defaulted as
It keeps identical as the loading source of current slice, the fluctuation of load of loading source in playing process can be reduced through the above way, made
The stability for obtaining the downloading rate of each loading source is more preferable, so as to promote the scheduling essence for the loading source for switching next fragment
Degree.In addition it is also possible to which the loading source default value of next fragment is arranged using other modes as needed, such as it is set as specified
Default loading source, random loading source etc..
As shown in Fig. 2, the detailed step that the present embodiment downloads video data needed for playing video based on fragment includes:
1) player sends playing request to program request dispatch server, receives broadcast address, all loading sources, loading source of return
Price weight and video code rate；
2) player requests preference strategy to program request dispatch server, determines whether preference strategy is price priority；
3) returned according to all loading sources of return and program request dispatch server or local detection obtains or sheet
The downloading rate and presence of each loading source of ground record generate online loading source online according to downloading rate sequence
Queue online_queue, price queue price_queue is generated according to the price weight sequencing of loading source, by offline downloading
Source is put into offline queue offline_queue；The price weight of each loading source can both be returned by program request dispatch server,
(such as CDN management server etc.) can also be requested to other servers by being preset at player local, or temporarily, under
The state in load source can be realized by node state manager.
4) the fragment size of fragment size or setting default is set according to video code rate；
It is calculated according to code rate, according to 512KB paging, fragment size=(((video code rate (kbps)/8)+511)/
512) * 512, unit K B；If using 512 KB of default value without video code rate；
5) the fragment request queue slice_queue for storing fragment request is established；
6) first fragment is requested according to the broadcast address of return, and fragment request uses http range request to obtain target
The information of video file size；
7) it creates the fragment request of first fragment and adds it in fragment request queue slice_queue；
8) the acquisition of information target video file size returned according to first fragment, by target video file size divided by fragment
Size rounds up to obtain fragment total quantity again, and first fragment is as current slice；
9) video data needed for downloading current slice selects if the failure of the loading source of current slice from online queue
Other available downloads sources are selected in online_queue or price queue price_queue and are switched to new available downloads
Source；
Player starts to play based on the video data that current slice returns, and timing detection plays the playable duration of caching to refer to
The loading source of fixed next fragment, defaults loading source of the available downloads source of current slice as next fragment；
The fragment request that whether there is next fragment in fragment request queue slice_queue is judged, if there is next
The fragment request of fragment, the then loading source specified for the loading source setting of next fragment；If there is no next fragment
Fragment request, then determine whether the fragment quantity created is equal to fragment total quantity, is dividing if not equal to fragment total quantity
The fragment request of new next fragment is created in piece request queue slice_queue and is arranged for the loading source of next fragment
Specified loading source；If the downloading of video data needed for current slice is completed, execution step 10) is jumped；Otherwise continue to jump
Turn to execute step 9)；
In the present embodiment, aforementioned timing detection plays the playable duration of caching to specify the loading source of next fragment to be specifically
Refer to: if the playable duration for playing caching is less than first threshold, the selection downloading speed from online queue online_queue
Loading source of the higher available downloads source of rate as next fragment；If the playable duration for playing caching is greater than the second threshold
Value, then select downloading of the lower available downloads source of bandwidth price as next fragment from price queue price_queue
Source, second threshold are bigger than first threshold；If the playable duration for playing caching is greater than third threshold value and is less than second threshold,
Decided whether according to preference strategy select the lower available downloads source of bandwidth price, if preference strategy be price priority if from
Loading source of the lower available downloads source of bandwidth price as next fragment is selected in price queue price_queue；Otherwise
Default loading source of the available downloads source of current slice as next fragment.
It further include from offline queue when playing the playable duration of caching greater than second threshold in the present embodiment
The step that offline_queue selection detects a unavailable loading source (it is more also to can according to need selection) offline
Suddenly, if detect the loading source recovery, which is revised as available downloads source, it may be assumed that by the loading source from
It is deleted in offline queue offline_queue, it will further according to obtained downloading rate or its history downloading rate is detected offline
It is inserted into corresponding position in online queue online_queue, is inserted into price queue price_queue according to price
Corresponding position.
When the present embodiment is detected offline, do not restore yet if detecting the loading source, by the unavailable loading source
It is revised as thoroughly discarded, subsequent no longer being detected offline, it may be assumed that directly delete it from offline queue offline_queue
And it is added without online queue online_queue and price queue price_queue, the loading source thoroughly discarded later in this way
It will not be used in online queue online_queue and price queue price_queue again, due to not in offline queue
In offline_queue, offline detection will not detect the loading source thoroughly discarded again.
10) corresponding loading source is updated according to this downloading rate for completing downloading to be located in online queue online_queue
Position；
11) judge whether that downloading is completed in all fragments, if downloading is not yet completed, in fragment request queue slice_
It selects next fragment as new current slice in queue, jumps execution step 9)；Otherwise, terminate and exit.
In the present embodiment, stored for fragment request using fragment request queue slice_queue, and fragment request
Current fragment request is stored in queue slice_queue, thereby increases and it is possible to which there are next fragment requests, and at current point of downloading
It can generate next fragment request during the video data of piece and specify the loading source of next fragment request；In addition, can also
To generate more fragment requests in fragment request queue slice_queue in advance as needed or all fragments are asked
It asks, be then downloaded one by one again or Parallel download is carried out to multiple fragments simultaneously, equally also may be implemented current in downloading
The loading source of next fragment request is specified during the video data of fragment.It is every to have downloaded a fragment then in the present embodiment
It is deleted from fragment request queue slice_queue, furthermore also be can according to need and downloaded one using every and then mark
To complete or deleting.In the present embodiment, for first fragment request in fragment request queue slice_queue, according to
The broadcast address that program request dispatch server returns is downloaded video data, furthermore also can according to need from specified or random
The downloading of video data is completed in available downloads source.
The present embodiment is playing end for http on-demand request conversion ingredient based on the method for playing the downloading of cache size fragment
Piece request is switched to effective node when node failure in conjunction with broadcasting cache size and node state in time；It is cached when playing
When size is too small, the faster node of speed of download is selected；When playing caching abundance enough, selects a good opportunity and select bandwidth more cheap
Node；Compared to common http point broadcast mode, error rate, Caton rate and bandwidth cost are effectively reduced.
It should be noted that loading source may be different appellations in not homologous ray, such as in content distribution system CDN
In may be named as distribution node, downloading node, data source etc. may be named as in other systems, but its essence be all
Video file in internet with heterogeneous networks path stores computer node.
The present embodiment also provides a kind of based on the system for playing the downloading of cache size fragment, including computer equipment, the meter
Calculate machine equipment be programmed to perform the present embodiment it is aforementioned based on play cache size fragment downloading method the step of.The present embodiment
It also provides a kind of based on the system for playing the downloading of cache size fragment, including computer equipment, storage Jie of the computer equipment
It is stored in matter and is programmed to perform the aforementioned computer program based on the method for playing the downloading of cache size fragment of the present embodiment,
The computer program can for player or player with download function or in the downloader for having playing function, or
Downloader of the person with simulation playing function.The present embodiment also provides a kind of computer readable storage medium, this is computer-readable
It is stored on storage medium and is programmed to perform the aforementioned calculating based on the method for playing the downloading of cache size fragment of the present embodiment
Machine program, the computer program can be for player or players with download function or in the case where there is playing function
Carry device, or the downloader with simulation playing function.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of based on the method for playing the downloading of cache size fragment, it is characterised in that implementation steps include: to be downloaded based on fragment
Video data needed for playing video, timing detection, which plays, when the video data needed for download each current slice caches
It can play duration, if the playable duration for playing caching is less than first threshold, select the higher available downloads of downloading rate
Loading source of the source as next fragment；If the playable duration for playing caching is greater than second threshold, bandwidth price is selected
Loading source of the lower available downloads source as next fragment, the second threshold are bigger than first threshold.
2. according to claim 1 based on the method for playing the downloading of cache size fragment, which is characterized in that under the switching
The loading source of one fragment further include: if the playable duration for playing caching is greater than third threshold value and is less than second threshold,
Decide whether the loading source for selecting the lower available downloads source of bandwidth price as next fragment according to preference strategy, if
Preference strategy is that price priority then selects loading source of the lower available downloads source of bandwidth price as next fragment.
3. according to claim 2 based on the method for playing the downloading of cache size fragment, which is characterized in that described play is delayed
It further include the step for selecting to detect at least one unavailable loading source offline when the playable duration deposited is greater than second threshold
Suddenly, if detecting loading source recovery, which is revised as available downloads source.
4. it is according to claim 3 based on play cache size fragment downloading method, which is characterized in that it is described carry out from
In the step of line detects, do not restore yet if detecting the loading source, by the unavailable loading source be revised as thoroughly it is discarded, after
It is continuous no longer to be detected offline.
5. according to claim 4 based on the method for playing the downloading of cache size fragment, which is characterized in that under the selection
Carry the higher available downloads source of rate specifically refer to from online queue select the higher available downloads source of downloading rate, it is described
It is stored with all available downloads sources in line queue and is ranked up according to the downloading rate of each loading source；The selection band
The wide lower available downloads source of price specifically refers to select the lower available downloads source of bandwidth price, the valence from price queue
It is stored with all available downloads sources in lattice queue and is ranked up according to the bandwidth price of each loading source；The selection pair
At least one unavailable loading source carries out offline detection and specifically refers to select from offline queue at least one unavailable downloading
Source is detected offline, and the offline queue is from being stored with all unavailable loading sources.
6. according to claim 5 based on the method for playing the downloading of cache size fragment, which is characterized in that the online team
Be classified as to program request dispatch server issue on-demand request after according to program request dispatch server return all loading sources in can
It is generated with loading source and its downloading rate sequence, and according to completion after video data needed for downloading each current slice
The state and speed of download of the loading source of downloading update its sequence in online queue；The price queue is based on online team
The loading source of column increases or completes to update when reducing；If met when video data needed for described each current slice of downloading
Then the loading source of failure is deleted from online queue, price queue to loading source failure and offline queue is added.
7. according to claim 1 based on the method for playing the downloading of cache size fragment, which is characterized in that the downloading is every
The loading source of next fragment is defaulted as keeping the loading source phase with current slice when video data needed for one current slice
Together.
8. based on the method for playing the downloading of cache size fragment described according to claim 1~any one of 7, feature exists
In the detailed step of video data needed for the downloading broadcasting video based on fragment includes:
1) player sends playing request to program request dispatch server, receives broadcast address, all loading sources, loading source of return
Price weight and video code rate；
2) player requests preference strategy to program request dispatch server, determines whether preference strategy is price priority；
3) returned according to all loading sources of return and program request dispatch server or local detection obtains or sheet
The downloading rate and presence of each loading source of ground record generate online loading source online according to downloading rate sequence
Queue generates price queue according to the price weight sequencing of loading source, and offline loading source is put into offline queue；
4) the fragment size of fragment size or setting default is set according to video code rate；
5) the fragment request queue for storing fragment request is established；
6) first fragment is requested according to the broadcast address of return, and fragment request uses http range request to obtain target
The information of video file size；
7) it creates the fragment request of first fragment and adds it in fragment request queue；
8) the acquisition of information target video file size returned according to first fragment, by target video file size divided by fragment
Size rounds up to obtain fragment total quantity again, and first fragment is as current slice；
9) video data needed for downloading current slice, if the failure of the loading source of current slice selection from online queue or
Other available downloads sources are selected in price queue and are switched to new available downloads source；
Player starts to play based on the video data that current slice returns, and timing detection plays the playable duration of caching to refer to
The loading source of fixed next fragment, defaults loading source of the available downloads source of current slice as next fragment；
Judge the fragment request that whether there is next fragment in fragment request queue, is asked if there is the fragment of next fragment
It asks, then the loading source specified for the loading source setting of next fragment；If there is no the fragment request of next fragment, then sentence
Whether the fixed fragment quantity created is equal to fragment total quantity, creates in fragment request queue if not equal to fragment total quantity
Build the fragment request of new next fragment and the loading source specified for the setting of the loading source of next fragment；If current slice
Required video data, which is downloaded, to be completed, then jumps execution step 10)；Otherwise continue to jump execution step 9)；
10) corresponding loading source is updated according to this downloading rate for completing downloading and is located at the position in online queue；
11) judge whether that downloading is completed in all fragments, if not yet completing downloading, selected in fragment request queue
Next fragment jumps execution step 9) as new current slice；Otherwise, terminate and exit.
9. a kind of based on the system for playing the downloading of cache size fragment, including computer equipment, it is characterised in that: the computer
Equipment is programmed to perform the step based on the method for playing the downloading of cache size fragment described in any one of claim 1~8
Suddenly；Or it is stored with and is programmed to perform described in any one of claim 1~8 on the storage medium of the computer equipment
Computer program based on the method for playing the downloading of cache size fragment.
10. a kind of computer readable storage medium, it is characterised in that: be stored with and be programmed on the computer readable storage medium
With the computer program based on the method for playing the downloading of cache size fragment described in any one of perform claim requirement 1~8.
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