CN110535810A - A kind of processing method and terminal of video data - Google Patents
A kind of processing method and terminal of video data Download PDFInfo
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- CN110535810A CN110535810A CN201810514751.3A CN201810514751A CN110535810A CN 110535810 A CN110535810 A CN 110535810A CN 201810514751 A CN201810514751 A CN 201810514751A CN 110535810 A CN110535810 A CN 110535810A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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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
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
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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]
- H04N21/60—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
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64746—Control signals issued by the network directed to the server or the client
- H04N21/64761—Control signals issued by the network directed to the server or the client directed to the server
- H04N21/64769—Control signals issued by the network directed to the server or the client directed to the server for rate control
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- Computer Networks & Wireless Communication (AREA)
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- Business, Economics & Management (AREA)
- Health & Medical Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Databases & Information Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The embodiment of the invention provides a kind of processing method of video data and terminals, wherein, the method is applied in view networking, it include view networked terminals, view networked node server and view networking main control server depending on networking, it is used for depending on networking main control server to the view networked terminals configurating downlink communication link in view networking, which comprises time difference is determined according to the timestamp of the video data packet in video transmit queue depending on networked terminals；Time difference is compared with preset threshold value；Video code rate is adjusted according to comparison result；New video data is generated according to video code rate adjusted；New video data is sent to view networked node server, is used to that new video data be sent to other view networked terminals into view networking according to downstream communications link depending on networked node server.View networked terminals dynamic adjustment video code rate in the embodiment of the present invention, improves the transmitting efficiency of video data, avoids the Caton problem for sending video data.
Description
Technical field
The present invention relates to view networking technology field, processing method and a kind of terminal more particularly to a kind of video data.
Background technique
It is the important milestone of network Development depending on networking, is the more advanced form of internet, is a real-time network, it can
Realize the whole network HD video real-time Transmission that current internet cannot achieve, by numerous Internet applications push to HD videoization and
High definition is face-to-face.
It is raw according to preset video code rate depending on networked terminals when generating and sending video data in current view networking
At video data, and video data is directly transmitted, it is larger in preset video code rate, or the bandwidth deficiency of view networked terminals
When, it will cause the problem of video data sending card is paused.
Summary of the invention
In view of the above problems, it proposes the embodiment of the present invention and overcomes the above problem or at least partly in order to provide one kind
A kind of processing method of the video data to solve the above problems and a kind of corresponding terminal.
To solve the above-mentioned problems, the embodiment of the invention discloses a kind of processing method of video data, the method is answered
For regarding in networking, the view networking includes regarding networked terminals, view networked node server and view networking main control server, described
It is used for depending on networking main control server to the view networked terminals configurating downlink communication link in the view networking, which comprises
The view networked terminals determine time difference according to the timestamp of the video data packet in preset video transmit queue；It is described
The time difference is compared with preset threshold value depending on networked terminals；It is described to be adjusted depending on networked terminals according to comparison result
Video code rate；It is described that new video data is generated according to video code rate adjusted depending on networked terminals；The view networked terminals hair
Send the new video data to the view networked node server, the view networked node server is used for according to the downlink
The new video data is sent other view networked terminals into the view networking by communication link.
Optionally, the networked terminals that regard are according to the timestamp of the video data packet in preset video transmit queue, really
It fixes time difference, comprising: the view networked terminals are according to time of first video data packet in the video transmit queue
The timestamp of stamp and the last one video data packet, determines the time difference.
Optionally, the networked terminals that regard are according to the time of first video data packet in the video transmit queue
The timestamp of stamp and the last one video data packet, determines time difference, comprising: the view networked terminals will described in last
The timestamp of a video data packet subtracts the timestamp of first video data packet, obtains the time difference.
Optionally, described to be compared the time difference with preset threshold value depending on networked terminals, comprising: the view
The time difference is compared by networked terminals with the first preset threshold value and/or the second threshold value, wherein described first
Threshold value is less than second threshold value.
Optionally, the view networked terminals adjust video code rate according to comparison result, comprising: the view networked terminals are in institute
When stating comparison result indicates that the time difference is less than first threshold value, current video code rate is improved；The view networking
Terminal reduces the current video codes when the comparison result indicates that the time difference is greater than second threshold value
Rate.
Optionally, described that current video code rate is improved depending on networked terminals, comprising: the view networked terminals obtain current
Bandwidth numerical value and preset maximum video code rate；It is described to improve the current video code rate to the first video codes depending on networked terminals
Rate；Wherein, the numerical value of first video code rate is percent N and the maximum video code rate of the current bandwidth numerical value
Numerical value in relatively fractional value, N is greater than 1, and less than 100.
Optionally, described to reduce the current video code rate depending on networked terminals, comprising: described to work as depending on networked terminals acquisition
Preceding bandwidth numerical value and preset minimum video code rate；It is described to reduce the current video code rate to the second view depending on networked terminals
Frequency code rate；Wherein, the numerical value of second video code rate is percent N and the minimum video of the current bandwidth numerical value
Bigger numerical in the numerical value of code rate, N are greater than 1, and less than 100.
The embodiment of the invention also discloses a kind of terminal, for the terminal applies in view networking, the view networking includes view
Networked terminals, view networked node server and view networking main control server, the view networking main control server are used for the view
View networked terminals configurating downlink communication link in networking, it is described to comprise determining that module depending on networked terminals, for according to preset
The timestamp of video data packet in video transmit queue, determines time difference；Comparison module, for by the time difference with
Preset threshold value is compared；Module is adjusted, for adjusting video code rate according to comparison result；Generation module is used for foundation
Video code rate adjusted generates new video data；Sending module joins for sending the new video data to the view
Net node server, the view networked node server are used for according to the downstream communications link, by the new video data
Other view networked terminals being sent in the view networking.
Optionally, the determining module, for according to first video data packet in the video transmit queue when
Between stab and the timestamp of the last one video data packet, determine the time difference.
Optionally, the determining module, for subtracting described first for the timestamp of the last one video data packet
The timestamp of a video data packet obtains the time difference.
Optionally, the comparison module, for by the time difference and the first preset threshold value and/or the second thresholding
Value is compared, wherein first threshold value is less than second threshold value.
Optionally, the adjustment module, for indicating that the time difference is less than described first in the comparison result
When limit value, current video code rate is improved；When the comparison result indicates that the time difference is greater than second threshold value,
Reduce the current video code rate.
Optionally, the adjustment module, comprising: first obtains module, for obtaining current bandwidth numerical value and preset
Maximum video code rate；Module is improved, for improving the current video code rate to the first video code rate；Wherein, described first
The numerical value of video code rate is the relatively decimal in percent N of the current bandwidth numerical value and the numerical value of the maximum video code rate
Value, N are greater than 1, and less than 100.
Optionally, the adjustment module, comprising: second obtains module, for obtaining current bandwidth numerical value and preset
Minimum video code rate；Module is reduced, for reducing the current video code rate to the second video code rate；Wherein, described second
The numerical value of video code rate is the plurality in percent N of the current bandwidth numerical value and the numerical value of the minimum video code rate
Value, N are greater than 1, and less than 100.
The embodiment of the present invention includes following advantages:
The embodiment of the present invention is applied in view networking, includes view networked terminals, view networked node server and view depending on networking
Networking main control server is used for depending on networking main control server to the view networked terminals configurating downlink communication link in view networking.This
Inventive embodiments application view networking characteristic, depending on networked terminals according to the video data packet in preset video transmit queue when
Between stab, determine time difference；Time difference is compared with preset threshold value depending on networked terminals；Depending on networked terminals according to than
Relatively result adjusts video code rate；New video data is generated according to video code rate adjusted depending on networked terminals；Depending on networked terminals
New video data is sent to networked node server is regarded, is used for depending on networked node server according to downstream communications link, it will be new
Video data send to view networking in other view networked terminals.
In the embodiment of the present invention, depending on networked terminals according to the timestamp of the video data packet in video transmit queue, dynamic
The video code rate for generating video data is adjusted, and then improves the transmitting efficiency of video data, avoids transmission video data
Caton problem.
Detailed description of the invention
Fig. 1 is a kind of networking schematic diagram of view networking of the invention；
Fig. 2 is a kind of hardware structural diagram of node server of the invention；
Fig. 3 is a kind of hardware structural diagram of access switch of the invention；
Fig. 4 is the hardware structural diagram that a kind of Ethernet association of the invention turns gateway；
Fig. 5 is a kind of step flow chart of the processing method embodiment of video data of the invention；
The step of Fig. 6 is a kind of embodiment of the method depending on the video code rate for dynamically adjusting video data in networking of the invention
Flow chart；
Fig. 7 is a kind of structural block diagram of terminal embodiment of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
It is the important milestone of network Development depending on networking, is a real-time network, can be realized HD video real-time Transmission,
Push numerous Internet applications to HD video, high definition is face-to-face.
Real-time high-definition video switching technology is used depending on networking, it can be such as high in a network platform by required service
Clear video conference, Intellectualized monitoring analysis, emergency command, digital broadcast television, delay TV, the Web-based instruction, shows video monitoring
Field live streaming, VOD program request, TV Mail, individual character records (PVR), Intranet (manages) channel by oneself, intelligent video Broadcast Control, information publication
All be incorporated into a system platform etc. services such as tens of kinds of videos, voice, picture, text, communication, data, by TV or
Computer realizes that high-definition quality video plays.
Embodiment in order to enable those skilled in the art to better understand the present invention is introduced to depending on networking below:
Depending on networking, applied portion of techniques is as described below:
Network technology (Network Technology)
Traditional ethernet (Ethernet) is improved depending on the network technology innovation networked, with potential huge on network
Video flow.(Circuit is exchanged different from simple network packet exchange (Packet Switching) or lattice network
Switching), meet Streaming using network packet exchange depending on networking technology (to be translated into stream, stream, streaming, be one
Kind data transferring technique, becomes the data received the stream of one steady and continuous, continuously sends out, the sound for hearing user
Sound or the image seen are very steady, and user can start to carry out on the screen before entire data transmission is complete it is clear
Look at) demand.Have flexible, the simple and low price of packet switch depending on networking technology, is provided simultaneously with the quality and safety of circuit switching
Guarantee, realizes the seamless connection of the whole network switched virtual circuit and data format.
Switching technology (Switching Technology)
Two advantages of asynchronous and packet switch that Ethernet is used depending on networking eliminate Ethernet under the premise of complete compatible and lack
It falls into, has the end-to-end seamless connection of the whole network, direct user terminal, directly carrying IP data packet.User data is in network-wide basis
It is not required to any format conversion.It is the more advanced form of Ethernet depending on networking, is a real-time exchange platform, can be realized at present mutually
The whole network large-scale high-definition realtime video transmission that networking cannot achieve pushes numerous network video applications to high Qinghua, unitizes.
Server technology (Server Technology)
It is different from traditional server, its Streaming Media depending on the server technology in networking and unified video platform
Transmission be built upon it is connection-oriented on the basis of, data-handling capacity is unrelated with flow, communication time, single network layer energy
Enough transmitted comprising signaling and data.For voice and video business, handled depending on networking and unified video platform Streaming Media
Complexity many simpler than data processing, efficiency substantially increase hundred times or more than traditional server.
Reservoir technology (Storage Technology)
The ultrahigh speed reservoir technology of unified video platform in order to adapt to the media content of vast capacity and super-flow and
Using state-of-the-art real time operating system, the programme information in server instruction is mapped to specific hard drive space, media
Content is no longer pass through server, and moment is directly delivered to user terminal, and user waits typical time less than 0.2 second.It optimizes
Sector distribution greatly reduces the mechanical movement of hard disc magnetic head tracking, and resource consumption only accounts for the 20% of the internet ad eundem IP, but
The concurrent flow greater than 3 times of traditional disk array is generated, overall efficiency promotes 10 times or more.
Network security technology (Network Security Technology)
Depending on the structural design networked by servicing independent licence system, equipment and the modes such as user data is completely isolated every time
The network security problem that puzzlement internet has thoroughly been eradicated from structure, does not need antivirus applet, firewall generally, has prevented black
The attack of visitor and virus, structural carefree secure network is provided for user.
It services innovative technology (Service Innovation Technology)
Business and transmission are fused together by unified video platform, whether single user, private user or a net
The sum total of network is all only primary automatic connection.User terminal, set-top box or PC are attached directly to unified video platform, obtain rich
The multimedia video service of rich colorful various forms.Unified video platform is traditional to substitute with table schema using " menu type "
Complicated applications programming, considerably less code, which can be used, can be realized complicated application, realize the new business innovation of " endless ".
Networking depending on networking is as described below:
It is a kind of central controlled network structure depending on networking, which can be Tree Network, Star network, ring network etc. class
Type, but centralized control node is needed to control whole network in network on this basis.
As shown in Figure 1, being divided into access net and Metropolitan Area Network (MAN) two parts depending on networking.
The equipment of access mesh portions can be mainly divided into 3 classes: node server, access switch, terminal (including various machines
Top box, encoding board, memory etc.).Node server is connected with access switch, and access switch can be with multiple terminal phases
Even, and it can connect Ethernet.
Wherein, node server is the node that centralized control functions are played in access net, can control access switch and terminal.
Node server can directly be connected with access switch, can also directly be connected with terminal.
Similar, the equipment of metropolitan area mesh portions can also be divided into 3 classes: metropolitan area server, node switch, node serve
Device.Metropolitan area server is connected with node switch, and node switch can be connected with multiple node servers.
Wherein, node server is the node server for accessing mesh portions, i.e. node server had both belonged to access wet end
Point, and belong to metropolitan area mesh portions.
Metropolitan area server is the node that centralized control functions are played in Metropolitan Area Network (MAN), can control node switch and node serve
Device.Metropolitan area server can be directly connected to node switch, can also be directly connected to node server.
It can be seen that be entirely a kind of central controlled network structure of layering depending on networking network, and node server and metropolitan area
The network controlled under server can be the various structures such as tree-shaped, star-like, cyclic annular.
Visually claim, access mesh portions can form unified video platform (part in virtual coil), and multiple unified videos are flat
Platform can form view networking；Each unified video platform can be interconnected by metropolitan area and wide area depending on networking.
Classify depending on networked devices
1.1 embodiment of the present invention can be mainly divided into 3 classes: server depending on the equipment in networking, interchanger (including ether
Net gateway), terminal (including various set-top boxes, encoding board, memory etc.).Depending on networking can be divided on the whole Metropolitan Area Network (MAN) (or
National net, World Wide Web etc.) and access net.
1.2 equipment for wherein accessing mesh portions can be mainly divided into 3 classes: node server, access switch (including ether
Net gateway), terminal (including various set-top boxes, encoding board, memory etc.).
The specific hardware structure of each access network equipment are as follows:
Node server:
As shown in Fig. 2, mainly including Network Interface Module 201, switching engine module 202, CPU module 203, disk array
Module 204.
Wherein, Network Interface Module 201, the Bao Jun that CPU module 203, disk array module 204 are come in enter switching engine
Module 202；Switching engine module 202 look into the operation of address table 205 to the packet come in, to obtain the navigation information of packet；
And the packet is stored according to the navigation information of packet the queue of corresponding pack buffer 206；If the queue of pack buffer 206 is close
It is full, then it abandons；All pack buffer queues of 202 poll of switching engine mould, are forwarded: 1) port if meeting the following conditions
It is less than to send caching；2) the queue package counting facility is greater than zero.Disk array module 204 mainly realizes the control to hard disk, including
The operation such as initialization, read-write to hard disk；CPU module 203 is mainly responsible between access switch, terminal (not shown)
Protocol processes, to address table 205 (including descending protocol packet address table, uplink protocol package address table, data packet addressed table)
Configuration, and, the configuration to disk array module 204.
Access switch:
As shown in figure 3, mainly including Network Interface Module (downstream network interface module 301, uplink network interface module
302), switching engine module 303 and CPU module 304.
Wherein, the packet (upstream data) that downstream network interface module 301 is come in enters packet detection module 305；Packet detection mould
Whether destination address (DA), source address (SA), type of data packet and the packet length of the detection packet of block 305 meet the requirements, if met,
It then distributes corresponding flow identifier (stream-id), and enters switching engine module 303, otherwise abandon；Uplink network interface mould
The packet (downlink data) that block 302 is come in enters switching engine module 303；The data packet that CPU module 204 is come in enters switching engine
Module 303；Switching engine module 303 look into the operation of address table 306 to the packet come in, to obtain the navigation information of packet；
If the packet into switching engine module 303 is that downstream network interface is gone toward uplink network interface, in conjunction with flow identifier
(stream-id) packet is stored in the queue of corresponding pack buffer 307；If the queue of the pack buffer 307 is close full,
It abandons；If the packet into switching engine module 303 is not that downstream network interface is gone toward uplink network interface, according to packet
Navigation information is stored in the data packet queue of corresponding pack buffer 307；If the queue of the pack buffer 307 is close full,
Then abandon.
All pack buffer queues of 303 poll of switching engine module, are divided to two kinds of situations in embodiments of the present invention:
If the queue is that downstream network interface is gone toward uplink network interface, meets the following conditions and be forwarded: 1)
It is less than that the port sends caching；2) the queue package counting facility is greater than zero；3) token that rate control module generates is obtained.
If the queue is not that downstream network interface is gone toward uplink network interface, meets the following conditions and is forwarded:
1) it is less than to send caching for the port；2) the queue package counting facility is greater than zero.
Rate control module 208 is configured by CPU module 204, to all downlink networks in programmable interval
Interface generates token toward the pack buffer queue that uplink network interface is gone, to control the code rate of forwarded upstream.
CPU module 304 is mainly responsible for the protocol processes between node server, the configuration to address table 306, and,
Configuration to rate control module 308.
Ethernet association turns gateway:
As shown in figure 4, mainly including Network Interface Module (downstream network interface module 401, uplink network interface module
402), switching engine module 403, CPU module 404, packet detection module 405, rate control module 408, address table 406, Bao Huan
Storage 407 and MAC adding module 409, MAC removing module 410.
Wherein, the data packet that downstream network interface module 401 is come in enters packet detection module 405；Packet detection module 405 is examined
Ethernet mac DA, ethernet mac SA, Ethernet length or frame type, the view networking destination address of measured data packet
DA, whether meet the requirements depending on networking source address SA, depending on networking data Packet type and packet length, corresponding stream is distributed if meeting
Identifier (stream-id)；Then, MAC DA, MAC SA, length or frame type are subtracted by MAC removing module 410
(2byte), and enter corresponding receive and cache, otherwise abandon；
Downstream network interface module 401 detects the transmission caching of the port, if there is Bao Ze is according to the view of packet networking purpose
Address D A knows the ethernet mac DA of corresponding terminal, adds the ethernet mac DA of terminal, Ethernet assists the MAC for turning gateway
SA, Ethernet length or frame type, and send.
The function that Ethernet association turns other modules in gateway is similar with access switch.
Terminal:
It mainly include Network Interface Module, Service Processing Module and CPU module；For example, set-top box mainly connects including network
Mouth mold block, video/audio encoding and decoding engine modules, CPU module；Encoding board mainly includes Network Interface Module, video encoding engine
Module, CPU module；Memory mainly includes Network Interface Module, CPU module and disk array module.
The equipment of 1.3 metropolitan area mesh portions can be mainly divided into 3 classes: node server, node switch, metropolitan area server.
Wherein, node switch mainly includes Network Interface Module, switching engine module and CPU module；Metropolitan area server mainly includes
Network Interface Module, switching engine module and CPU module are constituted.
2, networking data package definition is regarded
2.1 access network data package definitions
Access net data packet mainly include following sections: destination address (DA), source address (SA), reserve bytes,
payload(PDU)、CRC。
As shown in the table, the data packet for accessing net mainly includes following sections:
| DA | SA | Reserved | Payload | CRC |
Wherein:
Destination address (DA) is made of 8 bytes (byte), and first character section indicates type (such as the various associations of data packet
Discuss packet, multicast packet, unicast packet etc.), be up to 256 kinds of possibility, the second byte to the 6th byte is metropolitan area net address,
Seven, the 8th bytes are access net address.
Source address (SA) is also to be made of 8 bytes (byte), is defined identical as destination address (DA).
Reserve bytes are made of 2 bytes.
The part payload has different length according to the type of different datagrams, if the type of datagram is various
Protocol package, then the length of the part payload is 64 bytes, if the type of datagram is single group unicast packets, payload
Partial length is 32+1024=1056 byte, is not restricted to above 2 kinds certainly.
CRC is made of 4 bytes, and calculation method follows the Ethernet CRC algorithm of standard.
2.2 Metropolitan Area Network (MAN) packet definitions
The topology of Metropolitan Area Network (MAN) is pattern, may there is 2 kinds, connection even of more than two kinds, i.e. node switching between two equipment
It can all can exceed that 2 kinds between machine and node server, node switch and node switch, node switch and node server
Connection.But the metropolitan area net address of metropolitan area network equipment is uniquely, to close to accurately describe the connection between metropolitan area network equipment
System, introduces parameter in embodiments of the present invention: label, uniquely to describe a metropolitan area network equipment.
In this specification label definition and multiprotocol label switching (Multi-Protocol Label Switch,
MPLS the definition of label) is similar, it is assumed that there are two connections between equipment A and equipment B, then data packet is from equipment A to equipment B
Just there are 2 labels, data packet also there are 2 labels from equipment B to equipment A.Label is divided into label, outgoing label, it is assumed that data packet into
The label (entering label) for entering equipment A is 0x0000, and the label (outgoing label) when this data packet leaves equipment A may reform into
0x0001.The networking process of Metropolitan Area Network (MAN) is to enter network process under centralized control, also means that address distribution, the label of Metropolitan Area Network (MAN)
Distribution be all to be dominated by metropolitan area server, node switch, node server be all passively execute, this point with
The label distribution of MPLS is different, and the distribution of the label of MPLS is the result that interchanger, server are negotiated mutually.
As shown in the table, the data packet of Metropolitan Area Network (MAN) mainly includes following sections:
| DA | SA | Reserved | Label | Payload | CRC |
That is destination address (DA), source address (SA), reserve bytes (Reserved), label, payload (PDU), CRC.Its
In, the format of label, which can refer to, such as gives a definition: label is 32bit, wherein high 16bit retains, only with low 16bit, its position
Set is between the reserve bytes and payload of data packet.
Based on the above-mentioned characteristic of view networking, one of the core concepts of the embodiments of the present invention is proposed, it then follows regard the association of networking
View is dynamically adjusted for generating video data depending on networked terminals according to the timestamp of the video data packet in video transmit queue
Video code rate.
Referring to Fig. 5, a kind of step flow chart of the processing method embodiment of video data of the invention, this method are shown
It can be applied in view networking, include regarding networked terminals, view networked node server and view networking main control server depending on networking, depending on
Network main control server be used for view networking in view networked terminals configurating downlink communication link, this method can specifically include as
Lower step:
Step 501, depending on networked terminals according to the timestamp of the video data packet in preset video transmit queue, when determining
Between difference.
In the concrete realization, regarding networked terminals can be set-top box (Set Top Box, STB), commonly referred to as set-top box or
Box on machine is the equipment of connection a television set and outside source, and the digital signal of compression can be changed into television content by it,
And it shows on a television set.
In general, set-top box can connect camera and microphone, it is more for acquiring video data and audio data etc.
Media data also can connect television set, for multi-medium datas such as playing video data and audio datas.
In the embodiment of the present invention, video transmit queue can be the caching of preset capacity, and the amount of capacity of caching can root
Set according to actual conditions, the embodiment of the present invention to the amount of capacity of caching with no restrictions.Video transmit queue can be preparatory
Setting in view networked terminals, the embodiment of the present invention to the preset position of video transmit queue with no restrictions.
In the embodiment of the present invention, one or more video data packets, video transmit queue are stored in video transmit queue
In chronological order of the video data packet according to video data packet in video data, be sequentially stored into video transmit queue
In.For example, video data S includes video data packet s1 and s2, the timestamp of video data packet s1 than video data packet s2 when
Between stab early, then when being stored in video data packet into video transmit queue, video data packet s1 is first stored in video transmit queue,
It is stored in video transmit queue after video data packet s2.
In one preferred embodiment of the invention, depending on networked terminals according to the video counts in preset video transmit queue
According to the timestamp of packet, determine that the detailed process of time difference can be with are as follows: view networked terminals are according to first in video transmit queue
The timestamp of a video data packet and the timestamp of the last one video data packet, determine time difference.Further, depending on connection
The timestamp of the last one video data packet in video transmit queue is subtracted first in video transmit queue by network termination
The timestamp of video data packet, obtains time difference.For example, in current video transmit queue D, there are video data packet s1,
S2, s3, s4 and s5, wherein video data packet s1 is first video data packet, and video data packet s5 is the last one video counts
According to packet, the timestamp of video data packet s1 is t1, and the timestamp of video data packet s5 is t5, then makees t5-t1 depending on networked terminals
For time difference.
It should be noted that first video data packet may be considered current video and send team in the embodiment of the present invention
In column, the video data packet being stored at first, the last one video data packet be may be considered in current video transmit queue, finally
The video data packet of deposit.
Step 502, time difference is compared with preset threshold value depending on networked terminals.
In the embodiment of the present invention, the purpose for determining time difference is, is carried out using time difference and preset threshold value
Compare, and then adjusts the video code rate for generating video data.
In one preferred embodiment of the invention, preset threshold value may include the first threshold value and the second thresholding
Value, wherein the first threshold value is less than the second threshold value.Time difference is being compared with preset threshold value depending on networked terminals
When, time difference can be compared with the first preset threshold value and/or the second threshold value.The time is indicated in comparison result
When difference is less than the first threshold value, no longer time difference can be compared with the second threshold value depending on networked terminals.Comparing
It, can be no longer by time difference and the first threshold value ratio depending on networked terminals when as a result indicating that time difference is greater than the second threshold value
Compared with.When comparison result indicates that time difference is greater than or equal to the first threshold value, view networked terminals need again by time difference and
Second threshold value is compared, alternatively, when comparison result indicates that time difference is less than or equal to the second threshold value, eventually depending on networking
End needs again to be compared time difference with the first threshold value.
Step 503, video code rate is adjusted according to comparison result depending on networked terminals.
In the embodiment of the present invention, regard networked terminals adjustment video code rate as current video code rate, i.e., current video
The video code rate of video data packet in transmit queue.
From the foregoing, it will be observed that time difference and the comparison result of threshold value can be divided into time difference less than the first threshold value,
Time difference is greater than the second threshold value, and, time difference is greater than or equal to the first threshold value, and is less than or equal to the second thresholding
Value.
In the embodiment of the present invention, when comparison result indicates time difference less than the first threshold value, alternatively, time difference is greater than
When the second threshold value, current video code rate is adjusted depending on networked terminals.
(1) when comparison result indicates time difference less than the first threshold value, current video codes are improved depending on networked terminals
Rate.
In the embodiment of the present invention, current video code rate can be improved depending on networked terminals, but cannot unlimitedly improve,
Excessively high video code rate not only will increase the volume of video data, also will increase the difficulty for sending video data, works as video code rate
When more than certain numerical value, the quality of video data is not improved further.Therefore, depending on networked terminals it needs to be determined that current
The raising upper limit value of video code rate.
In one preferred embodiment of the invention, depending on the available current bandwidth numerical value of networked terminals and it is preset most
Big video code rate, wherein current bandwidth numerical value can be carried out by view networked terminals by sending the byte number of video data packet
Gained is calculated, the particular technique means of the bandwidth numerical value current to acquisition of the embodiment of the present invention are with no restrictions.Maximum video code rate
Can be depending on the generation of video data requirement and transmission requirement etc., the embodiment of the present invention is without limitation.Eventually depending on networking
End can improve current video code rate to the first video code rate, and the numerical value of first video code rate may be considered current
Relatively fractional value in the numerical value of percent N of bandwidth numerical value and maximum video code rate, N are greater than 1, and less than 100.For example, current
Bandwidth numerical value be 200M, maximum video code rate is 102400kbps, N 80, i.e. view networked terminals are by current video code rate
It is increased to 80 the percent of current bandwidth numerical value, alternatively, being increased to maximum video code rate.Due to 80 the percent of 200M
For 160M, it is greater than 102400kbps, then current video code rate is increased to 160M depending on networked terminals.
(2) when comparison result indicates that time difference is greater than the second threshold value, current video codes are reduced depending on networked terminals
Rate.
In the embodiment of the present invention, current video code rate can be reduced depending on networked terminals, but cannot unlimitedly be reduced,
Too low video code rate can seriously affect the clarity of video data.Therefore, depending on networked terminals it needs to be determined that current video codes
The reduction lower limit value of rate.
In one preferred embodiment of the invention, depending on the available current bandwidth numerical value of networked terminals and it is preset most
Small video code rate, wherein current bandwidth numerical value can be carried out by view networked terminals by sending the byte number of video data packet
Gained is calculated, the particular technique means of the bandwidth numerical value current to acquisition of the embodiment of the present invention are with no restrictions.Minimum video code rate
Can be depending on the generation of video data requirement and transmission requirement etc., the embodiment of the present invention is without limitation.Eventually depending on networking
Current video code rate can be reduced to the second video code rate by end, and the numerical value of second video code rate may be considered current
Bigger numerical in the numerical value of percent N of bandwidth numerical value and minimum video code rate, N are greater than 1, and less than 100.For example, current
Bandwidth numerical value be 200M, minimum video code rate is 50000kbps, N 80, i.e. current video code rate drops in view networked terminals
As low as 80 the percent of current bandwidth numerical value, alternatively, being reduced to minimum video code rate.80 percent due to 200M is
160M is greater than 50000kbps, then current video code rate is reduced to 50000kbps depending on networked terminals.
It should be noted that being greater than or equal to the first threshold value for time difference, and it is less than or equal to the second threshold value
The case where, it can continue to determine time difference, current video code rate is not adjusted.
Step 504, new video data is generated according to video code rate adjusted depending on networked terminals.
In the embodiment of the present invention, new video data may be considered video to be generated, except video transmit queue
Data, the embodiment of the present invention with no restrictions, are referred to any existing technology to the technological means for generating new video data
Scheme.
Step 505, new video data is sent to view networked node server, depending on networked node server depending on networked terminals
For according to downstream communications link, new video data to be sent to other view networked terminals into view networking.
In this practical application, networking is regarded as the network with centralized control functions, including main control server and undernet
Equipment, which includes terminal, and one of the core idea depending on networking is, by notifying to exchange by main control server
Equipment is directed to when time downstream communications link of service matches table, and the table for being then based on the configuration carries out the transmission of data packet.
That is, including: depending on the communication means in networking
Main control server configuration is when time downstream communications link of service；Work as time data packet of service for what source terminal was sent,
It is sent to target terminal according to downstream communications link (such as view networked terminals).
In embodiments of the present invention, it includes: notice when the downlink of secondary service is logical that time downstream communications link of service is worked as in configuration
Believe that switching equipment involved in link matches table；It furthermore, include: that inquiry is configured according to downstream communications link transmission
Table, switching equipment are transmitted received data packet by corresponding port.
As previously mentioned, view networking includes access mesh portions, in access net, which is node server, under
The grade network equipment includes access switch and terminal.
In the concrete realization, service includes unicast communication service and Multicast Communication Service.It is logical for the unicast in access net
For telecommunications services, main control server configuration may comprise steps of when the step of downstream communications link of time service:
Sub-step S11, the service request protocol package that main control server is initiated according to source terminal are obtained when time downlink of service
Communication link information, downstream communications link information include participating in when time downlink of the main control server of service and access switch
Communication port information.
Sub-step S12, main control server are arranged according to downstream communication ports information in data packet addressed table inside it
When the downlink port that the data packet of secondary service is oriented to；And the downstream communication ports information according to access switch, to corresponding
Access switch sending port configuration order.
Sub-step S13, access switch according in port configuration command data packet addressed table inside it, setting when time
The downlink port that the data packet of service is oriented to.
For the Multicast Communication Service (such as video conference) in access net, main control server is obtained when under time service
The step of row communication link information may include following sub-step:
Sub-step S21, main control server obtain the service request agreement for the application Multicast Communication Service that target terminal is initiated
It wraps, includes the access net address of service type information, service content information and target terminal in service request protocol package；Wherein,
It include service number in service content information.
Sub-step S22, main control server in preset content-address mapping table, extract source terminal according to service number
Access net address.
Sub-step S23, main control server obtains the corresponding multicast address of source terminal, and distributes to target terminal；And according to
According to the access net address of service type information, source terminal and target terminal, the communication link information when time multicast services is obtained.
It should be noted that the execution time point for determining time difference in above-mentioned steps 501 can be video transmit queue
In when increasing or decreasing video data packet, i.e., when the video data packet in video transmit queue changes, execute in step 501
Operation.
Moreover, the video data packet for belonging to different video data can be existed simultaneously in video transmit queue.
Dynamically adjustment view is described below in a kind of networking of view in the content of processing method embodiment based on above-mentioned video data
The method of the video code rate of frequency evidence, as shown in fig. 6, this method can specifically include following steps:
Step 601, the timestamp for calculating the last one video data packet in video transmit queue depending on networked terminals subtracts the
The time difference of the timestamp of one video data packet.
Step 602, time difference is compared with the first threshold value and the second threshold value respectively depending on networked terminals.
When time difference is less than the first threshold value, alternatively, executing step when time difference is greater than the second threshold value
603.When being greater than or equal to the first threshold value in time difference, and being less than or equal to the second threshold value, it re-execute the steps 601.
Step 603, the 80% of current bandwidth numerical value is calculated depending on networked terminals.
Step 604, whether judge current bandwidth numerical value depending on networked terminals 80% is greater than current video code rate.
The case where for time difference less than the first door restrict, if the 80% of current bandwidth numerical value is greater than current video codes
Rate thens follow the steps 605；If the 80% of current bandwidth numerical value is less than or equal to current video code rate, 606 are thened follow the steps.
The case where being greater than the second threshold value for time difference, if the 80% of current bandwidth numerical value is less than or equal to currently
Video code rate thens follow the steps 605；If the 80% of current bandwidth numerical value is greater than current video code rate, 606 are thened follow the steps.
Step 605, the 80% of current bandwidth numerical value is set by current video code rate depending on networked terminals.
It should be noted that video code rate adjusted, can not no more than maximum video code rate in this step 605
Lower than minimum video code rate.
Step 606, keep current video code rate constant depending on networked terminals.
The embodiment of the present invention is applied in view networking, includes view networked terminals, view networked node server and view depending on networking
Networking main control server is used for depending on networking main control server to the view networked terminals configurating downlink communication link in view networking.This
Inventive embodiments application view networking characteristic, depending on networked terminals according to the video data packet in preset video transmit queue when
Between stab, determine time difference；Time difference is compared with preset threshold value depending on networked terminals；Depending on networked terminals according to than
Relatively result adjusts video code rate；New video data is generated according to video code rate adjusted depending on networked terminals；Depending on networked terminals
New video data is sent to networked node server is regarded, is used for depending on networked node server according to downstream communications link, it will be new
Video data send to view networking in other view networked terminals.
In the embodiment of the present invention, depending on networked terminals according to the timestamp of the video data packet in video transmit queue, dynamic
The video code rate for generating video data is adjusted, and then improves the transmitting efficiency of video data, avoids transmission video data
Caton problem.
It should be noted that for simple description, therefore, it is stated as a series of action groups for embodiment of the method
It closes, but those skilled in the art should understand that, embodiment of that present invention are not limited by the describe sequence of actions, because according to
According to the embodiment of the present invention, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art also should
Know, the embodiments described in the specification are all preferred embodiments, and the related movement not necessarily present invention is implemented
Necessary to example.
Referring to Fig. 7, show a kind of structural block diagram of terminal embodiment of the invention, the terminal applies in view networking,
Include view networked terminals, view networked node server and view networking main control server depending on networking, is used for depending on networking main control server
To the view networked terminals configurating downlink communication link in view networking, following module can specifically include depending on networked terminals:
Determining module 701 determines the time for the timestamp according to the video data packet in preset video transmit queue
Difference.
Comparison module 702, for time difference to be compared with preset threshold value.
Module 703 is adjusted, for adjusting video code rate according to comparison result.
Generation module 704, for generating new video data according to video code rate adjusted.
Sending module 705 is used for sending new video data to view networked node server depending on networked node server
According to downstream communications link, new video data is sent to other view networked terminals into view networking.
In one preferred embodiment of the invention, determining module 701, for according to first in video transmit queue
The timestamp of the timestamp of video data packet and the last one video data packet, determines time difference.
In one preferred embodiment of the invention, determining module 701, for by the time of the last one video data packet
Stamp, subtracts the timestamp of first video data packet, obtains time difference.
In one preferred embodiment of the invention, comparison module 702, for by time difference and the first preset thresholding
Value and/or the second threshold value are compared, wherein the first threshold value is less than the second threshold value.
In one preferred embodiment of the invention, module 703 is adjusted, for indicating that time difference is less than in comparison result
When the first threshold value, current video code rate is improved；When comparison result indicates that time difference is greater than the second threshold value, reduction is worked as
Preceding video code rate.
In one preferred embodiment of the invention, module 703 is adjusted, comprising: first obtains module 7031, for obtaining
Current bandwidth numerical value and preset maximum video code rate；Module 7032 is improved, for improving current video code rate to first
Video code rate；Wherein, the numerical value of the first video code rate is percent N of current bandwidth numerical value and the numerical value of maximum video code rate
In relatively fractional value, N is greater than 1, and less than 100.
In one preferred embodiment of the invention, module 703 is adjusted, comprising: second obtains module 7033, for obtaining
Current bandwidth numerical value and preset minimum video code rate；Module 7034 is reduced, for reducing current video code rate to second
Video code rate；Wherein, the numerical value of the second video code rate is percent N of current bandwidth numerical value and the numerical value of minimum video code rate
In bigger numerical, N is greater than 1, and less than 100.
For terminal embodiment, since it is basically similar to the method embodiment, so be described relatively simple, it is related
Place illustrates referring to the part of embodiment of the method.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
It should be understood by those skilled in the art that, the embodiment of the embodiment of the present invention can provide as method, terminal or calculate
Machine program product.Therefore, the embodiment of the present invention can be used complete hardware embodiment, complete software embodiment or combine software and
The form of the embodiment of hardware aspect.Moreover, the embodiment of the present invention can be used one or more wherein include computer can
With in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of program code
The form of the computer program product of implementation.
The embodiment of the present invention be referring to according to the method for the embodiment of the present invention, terminal device (system) and computer program
The flowchart and/or the block diagram of product describes.It should be understood that flowchart and/or the block diagram can be realized by computer program instructions
In each flow and/or block and flowchart and/or the block diagram in process and/or box combination.It can provide these
Computer program instructions are set to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing terminals
Standby processor is to generate a machine, so that being held by the processor of computer or other programmable data processing terminal devices
Capable instruction generates for realizing in one or more flows of the flowchart and/or one or more blocks of the block diagram
The device of specified function.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing terminal devices
In computer-readable memory operate in a specific manner, so that instruction stored in the computer readable memory generates packet
The manufacture of command device is included, which realizes in one side of one or more flows of the flowchart and/or block diagram
The function of being specified in frame or multiple boxes.
These computer program instructions can also be loaded into computer or other programmable data processing terminal devices, so that
Series of operation steps are executed on computer or other programmable terminal equipments to generate computer implemented processing, thus
The instruction executed on computer or other programmable terminal equipments is provided for realizing in one or more flows of the flowchart
And/or in one or more blocks of the block diagram specify function the step of.
Although the preferred embodiment of the embodiment of the present invention has been described, once a person skilled in the art knows bases
This creative concept, then additional changes and modifications can be made to these embodiments.So the following claims are intended to be interpreted as
Including preferred embodiment and fall into all change and modification of range of embodiment of the invention.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also including other elements that are not explicitly listed, or further includes for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device for including the element.
Above to a kind of processing method and a kind of terminal of video data provided by the present invention, it is described in detail,
Used herein a specific example illustrates the principle and implementation of the invention, and the explanation of above embodiments is only used
In facilitating the understanding of the method and its core concept of the invention；At the same time, for those skilled in the art, according to the present invention
Thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as
Limitation of the present invention.
Claims (14)
1. a kind of processing method of video data, which is characterized in that the method is applied in view networking, described to include depending on networking
Depending on networked terminals, view networked node server and view networking main control server, the view networking main control server is used for described
Depending on the view networked terminals configurating downlink communication link in networking, which comprises
The view networked terminals determine time difference according to the timestamp of the video data packet in preset video transmit queue；
It is described to be compared the time difference with preset threshold value depending on networked terminals；
The view networked terminals adjust video code rate according to comparison result；
It is described that new video data is generated according to video code rate adjusted depending on networked terminals；
It is described to send the new video data to the view networked node server, the view networked node clothes depending on networked terminals
Device be engaged in for the new video data being sent other views into the view networking and is networked according to the downstream communications link
Terminal.
2. the processing method of video data according to claim 1, which is characterized in that the view networked terminals are according to preset
Video transmit queue in video data packet timestamp, determine time difference, comprising:
The view networked terminals are according to the timestamp of first video data packet in the video transmit queue and the last one
The timestamp of video data packet determines the time difference.
3. the processing method of video data according to claim 2, which is characterized in that the view networked terminals are according to
The timestamp of first video data packet in video transmit queue and the timestamp of the last one video data packet, when determining
Between difference, comprising:
The timestamp of the last one video data packet is subtracted first video data packet by the view networked terminals
Timestamp obtains the time difference.
4. the processing method of video data according to claim 1, which is characterized in that when the view networked terminals will be described
Between difference be compared with preset threshold value, comprising:
It is described to be compared the time difference with the first preset threshold value and/or the second threshold value depending on networked terminals,
In, first threshold value is less than second threshold value.
5. the processing method of video data according to claim 4, which is characterized in that it is described depending on networked terminals according to comparing
As a result video code rate is adjusted, comprising:
The view networked terminals improve current when the comparison result indicates that the time difference is less than first threshold value
Video code rate；
The view networked terminals are when the comparison result indicates that the time difference is greater than second threshold value, described in reduction
Current video code rate.
6. the processing method of video data according to claim 5, which is characterized in that the view networked terminals improve current
Video code rate, comprising:
It is described to obtain current bandwidth numerical value and preset maximum video code rate depending on networked terminals；
It is described to improve the current video code rate to the first video code rate depending on networked terminals；
Wherein, percent N and the maximum video codes of the numerical value of first video code rate for the current bandwidth numerical value
Relatively fractional value in the numerical value of rate, N are greater than 1, and less than 100.
7. the processing method of video data according to claim 5 or 6, which is characterized in that the view networked terminals reduce
The current video code rate, comprising:
It is described to obtain current bandwidth numerical value and preset minimum video code rate depending on networked terminals；
It is described to reduce the current video code rate to the second video code rate depending on networked terminals；
Wherein, percent N and the minimum video codes of the numerical value of second video code rate for the current bandwidth numerical value
Bigger numerical in the numerical value of rate, N are greater than 1, and less than 100.
8. a kind of terminal, which is characterized in that for the terminal applies in view networking, the view networking includes view networked terminals, view
Networked node server and view networking main control server, the view networking main control server are used to join the view in the view networking
Network termination configurating downlink communication link, it is described to include: depending on networked terminals
Determining module determines time difference for the timestamp according to the video data packet in preset video transmit queue；
Comparison module, for the time difference to be compared with preset threshold value；
Module is adjusted, for adjusting video code rate according to comparison result；
Generation module, for generating new video data according to video code rate adjusted；
Sending module, for sending the new video data to the view networked node server, the view networked node clothes
Device be engaged in for the new video data being sent other views into the view networking and is networked according to the downstream communications link
Terminal.
9. terminal according to claim 8, which is characterized in that the determining module, for sending team according to the video
The timestamp of first video data packet in column and the timestamp of the last one video data packet, determine the time difference.
10. terminal according to claim 9, which is characterized in that the determining module, for the last one video by described in
The timestamp of data packet subtracts the timestamp of first video data packet, obtains the time difference.
11. terminal according to claim 8, which is characterized in that the comparison module, for by the time difference and in advance
The first threshold value and/or the second threshold value set are compared, wherein first threshold value is less than second threshold value.
12. terminal according to claim 11, which is characterized in that the adjustment module, in the comparison result table
When showing that the time difference is less than first threshold value, current video code rate is improved；Described in comparison result expression
When time difference is greater than second threshold value, the current video code rate is reduced.
13. terminal according to claim 12, which is characterized in that the adjustment module, comprising:
First obtains module, for obtaining current bandwidth numerical value and preset maximum video code rate；
Module is improved, for improving the current video code rate to the first video code rate；
Wherein, percent N and the maximum video codes of the numerical value of first video code rate for the current bandwidth numerical value
Relatively fractional value in the numerical value of rate, N are greater than 1, and less than 100.
14. terminal according to claim 12 or 13, which is characterized in that the adjustment module, comprising:
Second obtains module, for obtaining current bandwidth numerical value and preset minimum video code rate；
Module is reduced, for reducing the current video code rate to the second video code rate；
Wherein, percent N and the minimum video codes of the numerical value of second video code rate for the current bandwidth numerical value
Bigger numerical in the numerical value of rate, N are greater than 1, and less than 100.
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