CN109587579A - Multi-view code stream transmission method, device, equipment and storage medium based on CDN - Google Patents
Multi-view code stream transmission method, device, equipment and storage medium based on CDN Download PDFInfo
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- CN109587579A CN109587579A CN201811330046.4A CN201811330046A CN109587579A CN 109587579 A CN109587579 A CN 109587579A CN 201811330046 A CN201811330046 A CN 201811330046A CN 109587579 A CN109587579 A CN 109587579A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003860 storage Methods 0.000 title claims description 10
- 230000000007 visual effect Effects 0.000 claims abstract description 126
- 238000004891 communication Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 241001269238 Data Species 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000003447 ipsilateral effect Effects 0.000 description 1
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Classifications
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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
-
- 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
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234363—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by altering the spatial resolution, e.g. for clients with a lower screen resolution
-
- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/65—Transmission of management data between client and server
- H04N21/658—Transmission by the client directed to the server
- H04N21/6587—Control parameters, e.g. trick play commands, viewpoint selection
-
- 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
- H04N21/81—Monomedia components thereof
- H04N21/816—Monomedia components thereof involving special video data, e.g 3D video
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a kind of multi-view code stream transmission method based on CDN, applied in 360 degree of panoramic video transmission, comprising steps of obtaining the code stream set at encoded visual angle, at least one that lookup and current visual angle point distance meet first choice standard in the code stream set closes on visual angle point, the bit stream data of current visual angle is downloaded, while downloading the bit stream data for closing on visual angle described in backup.Transmission improvement is carried out using visual angle dimension to improve switching efficiency, it may insure user in watching process, another visual angle code stream can be quickly switched by the code stream at a visual angle, keep panoramic video user experience more preferable, apparent code stream delay will not be experienced, transmission bandwidth is saved simultaneously, there is good economic and social benefit, disclosed by the invention is widely suitable to wide-angle video transmission fields.
Description
Technical field
The present invention relates to multi-angle video transmission field, especially a kind of multi-view code stream transmission method based on CDN, dress
It sets, equipment and storage medium.
Background technique
Content distribution cloth network (CDN), the basic principle of CDN are that various cache servers are widely used, these are cached
In area or the network that server distribution accesses Relatively centralized to user, when user accesses website, global load technology is utilized
The access of user is directed toward on the nearest cache server working properly of distance, is asked by cache server directly in response to user
It asks.
With the continuous development of VR technology, the transmission of multi-view point video data becomes more and more important, in 360 degree of aphorama
It keeps pouring in defeated, its main feature is that user can freely select the visual angle of viewing, so as to watch the not ipsilateral of subject
Face.
Opposite conventional video, the concept that wide-angle video (such as 360 degree of panoramic videos) increases visual angle are visual due to human eye
Range more than the object of this range, needs rotatable head that can see, the panoramic video of horizontal 360-degree at 120 degree or so
It has been more than the visual range of human eye, the video area beyond human viewable's range can not have been encoded or with lower code
Rate, frame per second are encoded, to reduce the transmission bandwidth demand of system, based on this characteristic, there has been proposed 360 degree a variety of
The multi-view coded method of panoramic video.However, on the one hand, existing view angle switch method switch speed is slow, leads to user's body
Test difference；On the other hand, it is big to will lead to transmitted data amount again by the way of transmitting full view video, cost raising.Therefore it provides
Switch in a kind of panoramic video scene rapid multi-view code stream transmission method be it is necessary, because of the speed of view angle switch
It is an important indicator of panoramic video user experience.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
Purpose, which is to provide in a kind of panoramic video scene, switches rapid multi-view code stream transmission method, device, equipment and storage medium.
The technical scheme adopted by the invention is that:
In a first aspect, the present invention provides a kind of multi-view code stream transmission method based on CDN, it is applied to wide-angle video and transmits
In, comprising steps of
Obtain the code stream set at encoded visual angle；
At least one that lookup and current visual angle point distance meet first choice standard in the code stream set closes on view
Angle point；
The bit stream data of current visual angle is downloaded, while downloading the bit stream data for closing on visual angle described in backup.
Further, the wide-angle video includes 360 panoramic videos.
Further, the coordinate system of the visual angle point is specially rectangular coordinate system in space.
Further, current visual angle central point is expressed as Vi(pi, yi, ri) is (X in the position of rectangular coordinate system in spacei,
Yi,Zi), transformational relation are as follows:
Wherein pi is pitch angle, and yi is azimuth, and ri is roll angle；
The visual angle point closed on current visual angle is expressed as Vj(pi, yi, ri), position in a space rectangular coordinate system are
(Xj,Yj,Zj), then the distance definition at two visual angles are as follows:
dj=(Vi-Vj)2=(Xi-Xj)2+(Yi-Yj)2+(Zi-Zj)2
The first choice standard are as follows: the distance at two visual angles is less than pre-determined distance threshold value, indicates are as follows:
dj<M
Wherein M is pre-determined distance threshold value.
Further, if according to first choice standard lookup close on visual angle point quantity it is more than one when, download standby
All bit stream datas for closing on visual angle point of part.
Further, the bit stream data includes three dimensions: time dimension, clarity dimension and visual angle dimension；
The time dimension refers to the played in order of code stream；
The clarity dimension refers to that code stream encodes the different code rate code streams to be formed according to different resolution；
The visual angle dimension, which refers to, carries out code stream segmentation according to predefined visual angle within the scope of 360 degree of full scenes；
The bit stream data of downloading current visual angle refers specifically to: downloading current visual angle dimension, the first preset time dimension and the
The bit stream data of one default clarity dimension.
Further, the downloading backup refers to: when user downloads and receives current visual angle code stream, CDN downloads preparation in advance
Close on visual angle dimension, the second preset time dimension and the second default clarity dimension bit stream data.
Second aspect, the present invention provide a kind of multi-view code stream transmitting device based on CDN, comprising:
Code stream set obtains module: for obtaining the code stream set at encoded visual angle；
It closes on visual angle selecting module: meeting first choice with current visual angle point distance for searching in the code stream set
At least one of standard closes on visual angle point；
Backup downloading bit stream data module: downloading the bit stream data of current visual angle, while downloading and closing on visual angle described in backup
Bit stream data.
The third aspect, the present invention provide a kind of multi-view code stream transmission control equipment based on CDN, comprising:
At least one processor；And
The memory being connect at least one described processor communication；Wherein,
The memory is stored with the instruction that can be executed by least one described processor, and described instruction is by described at least one
A processor executes, so that at least one described processor is able to carry out method described in any of the above embodiments.
Fourth aspect, the present invention provide a kind of computer readable storage medium, the computer-readable recording medium storage
There are computer executable instructions, the computer executable instructions are for making computer execute side as described in any one of the above embodiments
Method.
The beneficial effects of the present invention are:
The present invention by obtaining the code stream set at encoded visual angle, searched in the code stream set with current visual angle point away from
Visual angle point is closed on from least one for meeting first choice standard, downloads the bit stream data of current visual angle, while downloading backup institute
The bit stream data for closing on visual angle is stated, carries out transmission improvement using visual angle dimension to improve switching efficiency, it can be ensured that user is seeing
During seeing, it can be quickly switched into another visual angle code stream by the code stream at a visual angle, make panoramic video user experience more
It is good, apparent code stream delay will not be experienced, while saving transmission bandwidth, there is good economic and social benefit.
Disclosed by the invention is widely suitable to wide-angle video transmission fields.
Detailed description of the invention
Fig. 1 is the multi-view code stream transmission method flow chart in an embodiment of the present invention based on CDN；
Fig. 2 is the coding mode schematic diagram of the multi-angle of view of CDN in the prior art；
Fig. 3 is the coding mode schematic diagram of the multi-angle of view of CDN in an embodiment of the present invention；
Fig. 4 is the multi-view code stream transmitting device structure chart in an embodiment of the present invention based on CDN；
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
In the prior art, for traditional code stream of sliced transmission, this dimension of having time between different video fragment
After the correlation of degree, i.e. user download n-th of fragment, CDN needs to buffer fragment, then (n+1)th, n+2 ... points of downloading
A possibility that piece is downloaded is very big, and in order to adapt to the heterogeneous networks state of different user, the service provider of video data would generally
Video is encoded according to different resolution encoding methods, such as common 480P, several resolution ratio such as 720P, 1080P, this
CDN is resulted in need the video data of two dimensions of download time and resolution ratio, and in VR scene, such as 360 degree of aphoramas are kept pouring in
In defeated, CDN also needs the audio, video data buffered on the visual angle adjacent with current time visual angle in the dimension of visual angle that could improve
Switching efficiency.
Embodiment one:
As shown in Figure 1, be a kind of multi-view code stream transmission method flow chart based on CDN of the present embodiment, comprising steps of
S1: the code stream set at encoded visual angle is obtained；S2: it is searched in code stream set and meets the first choosing with current visual angle central point distance
At least one for selecting standard closes on visual angle point；S3: downloading the bit stream data of current visual angle, while downloading the code that backup closes on visual angle
Flow data.
In the present embodiment, the code stream set expression at N number of encoded visual angle is { V1,V2,V3,...VN, it is assumed that current visual angle
For Vi, then searched in code stream set according to first choice standard and current visual angle ViVisual angle is closed on apart from nearest num, and
In downloading current visual angle ViBit stream data when, downloading backup caching num closes on the bit stream datas at visual angle.
Wherein visual angle central point is coordinate of the spherical surface visual angle point under rectangular coordinate system in space, such as current visual angle central point
It is expressed as Vi(pi, yi, ri) is (X in the position of rectangular coordinate system in spacei,Yi,Zi), transformational relation are as follows:
Pi is pitch angle, and yi is azimuth, and ri is roll angle.
The visual angle central point adjacent with current visual angle is expressed as Vj(pi, yi, ri), position in a space rectangular coordinate system
For (Xj,Yj,Zj), then the distance definition at two visual angles are as follows:
dj=(Vi-Vj)2=(Xi-Xj)2+(Yi-Yj)2+(Zi-Zj)2
Thus first choice standard setting are as follows: the distance at two visual angles is less than pre-determined distance threshold value, is embodied as:
dj<M
Wherein M is pre-determined distance threshold value.
Work as djBe considered as when less than pre-determined distance threshold value the visual angle visual angle j central point and visual angle i visual angle central point away from
From minimum, therefore when user downloads the code stream of visual angle i, need simultaneously to back up the data downloading of visual angle j, once user needs
Visual angle j is switched to from visual angle i, it can cracking completion handoff procedure.
If being searched in code stream set and closing on visual angle point with what current visual angle central point distance met first choice standard
When more than one, then download all bit stream datas apart from minimal visual angle central point of backup, i.e., num numerical value above is greater than etc.
In 1, then when downloading the code stream of visual angle i, the data downloading backup simultaneously by num apart from the smallest visual angle j1~jnum is needed
It is good.
As shown in Fig. 2, for the coding mode schematic diagram of the multi-angle of view of CDN in the prior art, wherein as it can be seen that code stream includes two
A dimension: time dimension and clarity dimension, wherein time dimension refers to the playing sequence of code stream, clarity dimension refer to code stream according to
Different resolution encodes the different code rate code streams to be formed, common including 420p, 720p and 1080p etc..
As shown in figure 3, for the coding mode schematic diagram of the multi-angle of view of CDN in the present embodiment, as it can be seen that the present embodiment in figure
Unlike the prior art, code stream includes three dimensions: time dimension, clarity dimension and visual angle to strategy when CDN Backup Data
Dimension, wherein visual angle dimension, which refers to, carries out code stream segmentation according to predefined visual angle within the scope of 360 degree of full scenes, with clarity
For 720p, 1080p, it is seen that in the dimension of visual angle, different clarity code streams include the code stream at multiple and different visual angles, in user
When downloading receives current visual angle code stream, i.e., downloading receives current visual angle dimension, the first preset time dimension and first default clear
The bit stream data of clear degree dimension, CDN download in advance prepared recently all with current visual angle distance close on visual angle dimension, second
The bit stream data of preset time dimension and the second default clarity dimension, wherein the first preset time and the second preset time can be with
Identical, the first default clarity and the second default clarity can be identical.
Embodiment two:
As shown in figure 4, for the multi-view code stream transmitting device structure chart based on CDN in embodiment, comprising: code stream set obtains
Modulus block: for obtaining the code stream set at encoded visual angle；Close on visual angle selecting module: for searching and working as in code stream set
Forward sight angle point distance meet first choice standard at least one close on visual angle point；Backup downloading bit stream data module: downloading is worked as
The bit stream data at preceding visual angle, while downloading the bit stream data that visual angle is closed on described in backup.
The invention also discloses a kind of multi-view code stream transmission control equipment based on CDN, comprising: at least one processing
Device；And the memory being connect at least one processor communication；Wherein, be stored with can be by least one processor for memory
The instruction of execution, instruction is executed by least one processor, so that at least one processor is able to carry out such as one disclosure of embodiment
Method.
The invention also discloses a kind of computer readable storage medium, computer-readable recording medium storage has computer can
It executes instruction, computer executable instructions are for making computer execute the method as disclosed in embodiment one.
The present invention by obtaining the code stream set at encoded visual angle, searched in the code stream set with current visual angle point away from
Visual angle point is closed on from least one for meeting first choice standard, downloads the bit stream data of current visual angle, while downloading backup institute
The bit stream data for closing on visual angle is stated, carries out transmission improvement using visual angle dimension to improve switching efficiency, it can be ensured that user is seeing
During seeing, it can be quickly switched into another visual angle code stream by the code stream at a visual angle, make panoramic video user experience more
It is good, apparent code stream delay will not be experienced, while saving transmission bandwidth, there is good economic and social benefit, the present invention
It is widely portable to wide-angle video transmission field.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of multi-view code stream transmission method based on CDN is applied in wide-angle video transmission, which is characterized in that including step
It is rapid:
Obtain the code stream set at encoded visual angle；
At least one that lookup and current visual angle point distance meet first choice standard in the code stream set closes on visual angle point；
The bit stream data of current visual angle is downloaded, while downloading the bit stream data for closing on visual angle described in backup.
2. a kind of multi-view code stream transmission method based on CDN according to claim 1, which is characterized in that the wide-angle
Video includes 360 panoramic videos.
3. a kind of multi-view code stream transmission method based on CDN according to claim 1, which is characterized in that the visual angle
The coordinate system of point is specially rectangular coordinate system in space.
4. a kind of multi-view code stream transmission method based on CDN according to claim 3, which is characterized in that current visual angle
Central point is expressed as Vi(pi, yi, ri) is (X in the position of rectangular coordinate system in spacei,Yi,Zi), transformational relation are as follows:
Wherein pi is pitch angle, and yi is azimuth, and ri is roll angle；
The visual angle point closed on current visual angle is expressed as Vj(pi, yi, ri), position in a space rectangular coordinate system are (Xj,Yj,
Zj), then the distance definition at two visual angles are as follows:
dj=(Vi-Vj)2=(Xi-Xj)2+(Yi-Yj)2+(Zi-Zj)2
The first choice standard are as follows: the distance at two visual angles is less than pre-determined distance threshold value, indicates are as follows:
dj<M
Wherein M is pre-determined distance threshold value.
5. a kind of multi-view code stream transmission method based on CDN according to claim 4, which is characterized in that if according to
First choice standard lookup close on visual angle point quantity it is more than one when, then download and back up all code stream number for closing on visual angle point
According to.
6. a kind of multi-view code stream transmission method based on CDN according to claim 5, which is characterized in that the code stream
Data include three dimensions: time dimension, clarity dimension and visual angle dimension；
The time dimension refers to the playing sequence of code stream；
The clarity dimension refers to that code stream encodes the different code rate code streams to be formed according to different resolution；
The visual angle dimension, which refers to, carries out code stream segmentation according to predefined visual angle within the scope of 360 degree of full scenes；
The bit stream data of downloading current visual angle refers specifically to: downloading current visual angle dimension, the first preset time dimension and first are in advance
If the bit stream data of clarity dimension.
7. a kind of multi-view code stream transmission method based on CDN according to claim 6, which is characterized in that the downloading
Backup refers to: user download receive current visual angle code stream when, CDN download in advance prepare close on visual angle dimension, second it is default when
Between dimension and the second default clarity dimension bit stream data.
8. a kind of multi-view code stream transmitting device based on CDN characterized by comprising
Code stream set obtains module: for obtaining the code stream set at encoded visual angle；
It closes on visual angle selecting module: meeting first choice standard with current visual angle point distance for searching in the code stream set
At least one close on visual angle point；
Backup downloading bit stream data module: the bit stream data of current visual angle is downloaded, while downloading the code for closing on visual angle described in backup
Flow data.
9. a kind of multi-view code stream transmission control equipment based on CDN characterized by comprising
At least one processor；And
The memory being connect at least one described processor communication；Wherein,
The memory is stored with the instruction that can be executed by least one described processor, and described instruction is by described at least one
It manages device to execute, so that at least one described processor is able to carry out method as described in any one of claim 1 to 7.
10. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer can
It executes instruction, the computer executable instructions are for making computer execute method as described in any one of claim 1 to 7.
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| CN201811330046.4A CN109587579A (en) | 2018-11-09 | 2018-11-09 | Multi-view code stream transmission method, device, equipment and storage medium based on CDN |
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