CN101854224A - Error correcting coding method, device and system, and forwarding control method and device - Google Patents
Error correcting coding method, device and system, and forwarding control method and device Download PDFInfo
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Abstract
The invention discloses an error correcting coding method, comprising the steps: acquiring frame type to which the contents of media data messages belong, wherein the frame type comprises a basic frame and a predicative frame; implementing error correcting coding with different redundancy on the media data message with the basic frame as the content and on the media data message with the predicative frame as the content, wherein the redundancy of the error correcting coding, to which the media data message with the basic frame as the content is corresponding, is larger than that of the error correcting coding, to which the media data message with the predicative frame as the content is corresponding. The invention further provides a forwarding control method, a forwarding control device as well as an error correcting coding device and an error correcting coding system. According to the technical proposal provided by the embodiment of the invention, the basic frame in media data can be protected to a maximal extent and network resource can be saved in case of enhancing the transmission quality of the media data.
Description
Technical field
The present invention relates to network communications technology field, be specifically related to a kind of error correction/encoding method and device, system and transmission control method and device.
Background technology
Along with the fast development of network technology, Video Applications increases gradually on the communication network, and the transmission quality that improves video is a major issue.Because the real-time requirement of video traffic, the transport layer of communication network generally adopts RTP (Real-time Transport Protocol, RTP) message transmissions media data.Head end is encoded to media data, produces the media data message that is adapted at transmission over networks, and the RTP message is a type of media data message.The media data message uses the form encapsulated delivery of UDP (User Datagram Protocol, User Datagram Protoco (UDP)) datagram.UDP is a kind of towards connectionless, insecure transmission mechanism, needs upper-layer protocol that quality assurance is provided.In the prior art, use error correction coding that the error control of transfer of data is provided to the media data message.Error correction coding is mainly by carrying out the error correction coding operation to the media data message, promptly the media data message is increased redundant information, the media data message is generated the code word that redundancy is arranged by certain rule, if the media data message makes a mistake in transmission course, the information of error of transmission can be found and be recovered according to error correction coding to receiving terminal voluntarily.
The process of carrying out error correction coding and forwarding in the prior art is:
Encoder for correcting receives the media data message from head end, to the media datagrams literary grace with unified error correction coding protection mechanism.For example K media data message is an encoding block, carries out producing H error correction coding message after the error correction coding.The coding dispensing device is selected the error correction coding message amount of transmission to the network performance between the coding dispensing device according to user side, if each user side is to the network performance difference between the coding dispensing device, then be as the criterion with the poorest network environment, selectivity sends the quantity of error correction coding message.For example above-mentioned K media data message is corresponding to send X error correction coding message, if current to measure all user sides better to the network performance of coding dispensing device, and this K media data message correspondence transmission (X-1) individual error correction coding message so; If some user sides are bad to the network performance between the coding dispensing device, the coding dispensing device then is as the criterion with the poorest network environment, sends all X error correction coding message.Forwarding unit in the access network directly is transmitted to user side with the error correction coding message that receives.
The inventor finds in realizing process of the present invention; be assurance user terminal video quality in the prior art; to the media datagrams literary grace of transmitting video-frequency flow with unified error correction coding protection mechanism; though can recover the media data message of some; if but the bigger important frame of video quality influence is not resumed; the video quality of user side still can't guarantee; though to the unified error correction coding that adopts the highly redundant degree of media data message; can guarantee that receiving terminal obtains the video of better quality; but adopt the error correction coding of highly redundant degree will produce a large amount of error correction coding messages, the Internet resources of waste core net and Access Network.
Summary of the invention
For code correction method in the solution prior art can not well guarantee the problem of video quality; the invention provides frame type in a kind of differentiation media data message; and the media data message of different frame type in the media data message is carried out the method for the error correction coding of different redundancys; enhancing is to the protection of important frame, thus the video quality of assurance receiving terminal.
The error correction/encoding method that the embodiment of the invention provides comprises: obtain the affiliated frame type of message content of media data message, this frame type comprises basic frame and predictive frame; Media data message and the message content that to message content is basic frame is that the media datagrams literary grace of predictive frame is carried out error correction coding with different redundancys, and message content is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than message content.
The embodiment of the invention also provides a kind of transmission control method, comprising: the network performance that obtains Access Network; Judge the type of the error correction coding message flow that needs are transmitted according to the network performance of Access Network, the type of this error correction coding message flow comprises that message content is the pairing error correction coding message flow of media data message of basic frame and the pairing error correction coding message flow of media data message that message content is predictive frame; Obtain the identification information of the error correction coding message flow that needs forwarding, issue the forward command that comprises this identification information, make Access Network according to the forwarding of this identification information realization to the error correction coding message flow.
The embodiment of the invention also provides a kind of encoder for correcting, comprising: the frame type acquiring unit, be used to obtain the frame type under the message content of media data message, and this frame type comprises basic frame and predictive frame; Coding unit, being used for message content is that media data message and the message content of basic frame is that the media datagrams literary grace of predictive frame is carried out error correction coding with different redundancys, and message content is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than message content.
The embodiment of the invention also provides a kind of forwarding controller, comprising: the network performance acquiring unit is used to obtain the network performance of Access Network; Forward processing unit, be used for judging according to the network performance of Access Network the type of the error correction coding message flow that needs are transmitted, the type of this error correction coding message flow comprises that message content is the pairing error correction coding message flow of media data message of basic frame and the pairing error correction coding message flow of media data message that message content is predictive frame; The sign acquiring unit is used to obtain the identification information of the error correction coding message flow of needs forwarding; Order issues the unit, is used to issue the forward command of the identification information that comprises the error correction coding message flow.
The embodiment of the invention also provides a kind of error correction coding system, comprising: encoder for correcting, be used to obtain the frame type under the message content of media data message, and this frame type comprises basic frame and predictive frame; Media data message and the message content that to message content is basic frame is that the media datagrams literary grace of predictive frame is carried out error correction coding with different redundancys, and message content is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than message content; The coding dispensing device, be used for using different error correction coding message flows to send and forwarding controller through the error correction coding of the different redundancys behind the encoder for correcting coding, be used for judging the type of the error correction coding message flow that needs are transmitted according to the network performance of Access Network, issue the forward command of the identification information of the error correction coding message flow that comprises the needs forwarding, so that Access Network is according to the forwarding of this identification information realization to the error correction coding message flow.
Because the significance level of basic frame is greater than the significance level of predictive frame in the media data; error correction/encoding method embodiment of the present invention is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than message content at message content; therefore can be under the constant situation of average redundancy; protect the basic frame in the media data to greatest extent; reduction is to the protection of predictive frame; can solve in the prior art adopts identical redundancy to carry out the video quality problem that error correction coding is brought to frames all in the media data; under the situation of the media data quality that the raising user receives, save the Internet resources of core net and Access Network.
Description of drawings
Fig. 1 is the flow chart of error correction/encoding method embodiment of the present invention;
Fig. 2 is error correction/encoding method embodiment of the present invention carries out error correction coding to media data a schematic diagram;
Fig. 3 is the flow chart of transmission control method embodiment of the present invention;
Fig. 4 is the schematic diagram of encoder for correcting embodiment of the present invention;
Fig. 5 is the schematic diagram of forwarding controller embodiment of the present invention;
Fig. 6 is the schematic diagram of error correction coding system embodiment of the present invention.
Embodiment
The embodiment of the invention provides the device of a kind of error correction/encoding method, device and system and transmission control method and this method of realization.Technical scheme for a better understanding of the present invention describes in detail embodiment provided by the invention below in conjunction with accompanying drawing.
The embodiment of the invention provides a kind of error correction/encoding method, and the error correction/encoding method idiographic flow comprises referring to Fig. 1:
Error correction/encoding method embodiment of the present invention is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than message content at message content; therefore can be under the constant situation of average redundancy; protect the basic frame in the media data to greatest extent; reduction can solve in the prior art and adopt identical redundancy to carry out the video quality problem that error correction coding is brought to frames all in the media data the protection of predictive frame.Compare for the redundancy that the media data quality that improves the user and receive increases error correction coding with prior art, the present invention can be under the situation of the media data quality that the raising user receives, the average redundancy that keeps error correction coding, thus the Internet resources of core net saved.
Concrete, in embodiments of the present invention, the method for obtaining the frame type under the message content of media data message in the step 101 mainly contains:
Obtain the frame type under the message content of media data message according to frame type indication information, comprise the sequence number of the media data message at the sequence number of media data message at basic frame place and predictive frame place in this frame type indication information from head end.Because each media data message comprises unique sequence number, therefore after receiving the media data message, the frame type under the message content that can judge the media data message that receives according to the sequence number and the frame type indication information of media data message.
Further, can also judge frame type under the message content of media data message according to the label information of media data message.When the marker of media data message mark position is " 1 ", represent that the media data message that this frame is divided into finishes, two marker marker bits are the message amount that this frame is divided into for the message amount in the middle of the media data message of " 1 ".Therefore can judge the media data message quantity that each frame is divided into according to the marker marker bit of media data message head.Usually in media data, the capacity of basic frame is greater than the capacity of predictive frame, therefore the media data message quantity that the media data message quantity that basic frame is divided into is divided into greater than predictive frame can judge frame type under the message content of media data message according to the label information of media data message.
Further, can also decode, obtain the frame type under the message content of media data message by the frame type of judging decoded media data the media data message that receives.
Concrete, the error correction coding process that dissimilar frames is carried out different redundancys in the step 102 is:
With MPEG-4 (Moving Pictures Experts Group, dynamic image expert group) Bian Ma media data is an example, basic frame is the I frame, predictive frame is that P frame and B frame are example, the significance level of I frame, P frame, B frame reduces successively, media data for encoded in different formats, the type of its basic frame and predictive frame is not limited to I frame, P frame and B frame, can make the frame of other type, the inventive method embodiment in also can media data at other form important frame and less important frame carry out the error correction coding of different redundancys.
In embodiments of the present invention, the pairing media data message of I frame in the media data, the pairing media data message of P frame and the pairing media datagrams literary grace of B frame are encoded with the error correction coding that redundancy reduces successively.The protection of the pairing media data message of I frame, the pairing media data message of P frame and the pairing media data message of B frame reduces successively in the media data.Encode by the error correction coding of using redundancy to reduce successively to the pairing media data message of the pairing media data message of the I frame in the predictive frame, the pairing media data message of P frame and B frame; can be under the constant situation of average redundancy; increase is to the protection of I frame and P frame; reduction is to the protection of B frame; also can improve efficient to the media data error correction coding; increase the probability that I frame and P frame are repaired; thereby improve the media data quality that receives, and can save the Internet resources of core net.
In embodiments of the present invention, can be to the media data message forward error correction that interweaves, the type of error correction coding is not limited thereto, and can also be RS (Reed-Solomon, Reed-Suo Luoman) coding or other error correction coding.
Provide a concrete application scenarios of error correction/encoding method of the present invention below.For example, form 1 is 1.5MMPEG-4 coding GOP (Group Of Picture, picture group)=12 o'clock, and the I/P/B frame is divided into the situation of RTP message in a certain section video.For example an I frame has been divided into 14 RTP messages, is divided into 15 RTP messages followed by two B frames, and a P frame is divided into 10 RTP messages, and the RTP message amount that I frame, P frame and B frame are divided into can calculate according to the size of this frame.
| Frame type | RTP message number | Frame type | RTP message number | Frame type | RTP message number |
| ??I | ??14 | ??B，B | ??15 | ??P | ??10 |
When interweaving forward error correction coding, distinguish frame type under the message content of RTP message, the RTP message at I/B/P frame place is carried out forward error correction coding respectively, divide the D*L encoding block separately, every D*L RTP message is an encoding block, is arranged in the matrix of the capable L of the multiply by row of D.D RTP message of every row carries out XOR by bit, generates new error correction encoded data, and L new error correction encoded data is L the error correction coding message that interweaves, and redundancy is 1/D.When receiving terminal is decoded, at first wait for the data of an encoding block, arrange according to D*L, if part RTP message dropping wherein then according to the RTP message and the error correction coding message that receive, recovers the RTP message that these row are lost.
Because the real-time of video has limited each D*L coded block size, in the present embodiment, the RTP message amount that the I/B/P frame is divided into is all little, is an encoding block so set the RTP message that an I frame is divided into; Back to back two message contents are that B frame RTP message is second encoding block; The RTP message that next message content is the P frame is the 3rd encoding block.When carrying out error correction coding, judge the RTP message amount that each frame is divided into according to the marker marker bit of RTP header, in media data, the capacity of I frame is greater than the capacity of P frame and B frame, so the RTP message amount that the RTP message amount that the I frame is divided into is divided into greater than P frame and B frame.
Referring to Fig. 2, Fig. 2 is embodiment of the invention error correction/encoding method carries out error correction coding to the media data message a schematic diagram.
14 RTP messages that are divided into for the I frame adopt the encoding block of 3*5 to encode, and the redundancy of forward error correction coding is 35.7%; 15 RTP messages that two continuous B frames are divided into adopt the encoding block of 5*3 to encode, and the redundancy of forward error correction coding is 20%; 10 RTP messages that P frame is divided into adopt the encoding block of 4*3 to carry out, and the redundancy of forward error correction coding is 33.3%.Message content is that the redundancy of the redundancy of the pairing forward error correction coding of RTP message of I frame, the pairing forward error correction coding of RTP message that message content is the P frame and the redundancy of the pairing forward error correction coding of RTP message that message content is the B frame reduce successively, under identical packet drop, the repair ability of I frame data is the strongest, and the repair ability of B frame data is the most weak.
In embodiments of the present invention, the redundancy of the pairing forward error correction coding of RTP message that the I/P/B frame is divided into determines that according to the current network situation for example the poorest end to end network performance according to user feedback decides the coding redundancy degree.In this external cataloged procedure, can adjust the redundancy of the pairing forward error correction coding of RTP message that I, P, B frame be divided in real time.During the network performance variation, the redundancy of the pairing forward error correction coding of RTP message that raising I frame is divided into, the redundancy of the pairing forward error correction coding of RTP message that reduction B frame is divided into keeps average redundancy constant, lays special stress on protecting the I frame; Network performance has when improvement, the redundancy of the pairing forward error correction coding of RTP message that reduction I frame is divided into.If the RTP message is adopted the RS error correction coding, can increase the protection of RTP message, to tackle relatively poor Access Network environment.
Pass through said method; media datagrams literary grace to frame places dissimilar in the media data message is carried out error correction coding with different redundancys; can be under the situation that average redundancy remains unchanged; increase is to the protection of basic frame in the media data; message content is that the probability of recovery also can increase after the media data message of basic frame was lost.Compared with prior art; not only can increase protection to basic frame; can also solve increases the problem that redundancy is brought, and reaches balance between basic frame and the predictive frame in the protection media data, thereby saves core net, converge the Internet resources of net and Access Network.
The embodiment of the invention also provides a kind of transmission control method, specifically referring to Fig. 3, comprising:
The network performance of the Access Network that collect to connect, network performance can comprise the packet loss, delay, shake of Access Network etc.
Network performance information according to Access Network, judgement needs the error correction coding message flow type transmitted under different network environments, the type of error correction coding message flow comprises that message content is the pairing error correction coding message flow of media data message of basic frame and the pairing error correction coding message flow of media data message that message content is predictive frame.If current access network packet loss is less, judging only needs to transmit the pairing error correction coding message flow of basic frame.Packet loss is judged and need be transmitted pairing error correction coding message flow of basic frame and the pairing error correction coding message flow of predictive frame more for a long time.
Obtain the identification information of the error correction coding message flow that needs forwarding, issue the forward command that comprises described identification information to access network.Forwarding unit in the access network receives forward command, transmits corresponding error correction coding message flow according to the identification information of error correction coding message flow to the user.
In embodiments of the present invention, if current Access Network packet loss is less, then issue the forward command of the identification information that comprises the pairing error correction coding message flow of basic frame, only the E-Packet pairing error correction coding message flow of media data message of the basic frame of content of the forwarding unit in the access network.If current Access Network packet loss is more, then issue the forward command of the identification information of the identification information that comprises the pairing error correction coding message flow of basic frame and the pairing error correction coding message flow of predictive frame, the content that E-Packets of the forwarding unit in the access network is the pairing error correction coding message flow of media data message of basic frame and the pairing error correction coding message flow of media data message that message content is predictive frame.Compared with prior art, not only can transmit the error correction coding message of varying number, can also save the Internet resources of Access Network at different Access Networks.The user carries out the decode procedure of error correction coding according to the media data message that receives stream and error correction coding message flow, the media data message of losing in the recovery media data message stream, wherein the forwarding unit in the access network can be digital subscriber line access multiplex.
In embodiments of the present invention, the type of error correction coding message flow comprises that message content is the pairing error correction coding message flow of media data message that the pairing error correction coding message flow of media data message of I frame, the pairing error correction coding message flow of media data message that message content is the P frame and message content are the B frame.Packet loss at Access Network is less than or equal at 1% o'clock, and the judgement content that need E-Packet is the pairing error correction coding message flow of media data message of I frame; Be less than or equal at 5% o'clock greater than 1% at packet loss, the judgement content that need E-Packet is the pairing error correction coding message flow of media data message of I frame and the pairing error correction coding message flow of media data message that message content is the P frame; Greater than 5% o'clock, judging needed to transmit all error correction coding message flows at packet loss.It is pointed out that the embodiment of the invention can include but not limited to above-mentioned forwarding strategy according to current network condition adjustment forwarding strategy in actual applications.
In the inventive method embodiment, the identification information that obtains the error correction coding message flow that needs forwarding can be by inquiry error correction coding message flow concordance list, and form 1 is an error correction coding message flow concordance list in the embodiment of the invention.
| Sign 1 | The pairing error correction coding message flow of the media data message of I |
| Sign | |
| 2 | The pairing error correction coding message flow of the media data message of |
| Sign | |
| 3 | The pairing error correction coding message flow of the media data message of B frame |
Comprise message content in the error correction coding message flow concordance list and be the identification information of the pairing error correction coding message flow of media data message of the identification information of the pairing error correction coding message flow of media data message of identification information, P frame of the pairing error correction coding message flow of media data message of I frame and B frame, wherein the identification information of error correction coding message flow can be configured by head end, this identification information is left in the error correction coding message flow concordance list by signalling path by head end.
In the inventive method embodiment, the identification information of error correction coding message flow can be the five-tuple information of IP datagram, i.e. source IP address, purpose IP address, source port number, destination slogan and protocol number.The identification information of error correction coding message flow can also be the payload type field of RTP header.
The embodiment of the invention also provides a kind of encoder for correcting 10, and referring to Fig. 4, this encoder for correcting 10 comprises:
Frame type acquiring unit 11 is used to obtain the frame type under the message content of media data message, and described frame type comprises basic frame and predictive frame;
In embodiment of the invention encoder for correcting 10, frame type acquiring unit 11 is the sequence number of media data message of basic frame and the sequence number of the media data message that message content is predictive frame by obtaining the frame type indication information from head end, comprising message content in this frame type indication information.At this moment, the encoder for correcting in the embodiment of the invention 10 can be arranged in the head end video coding system.
In addition, encoder for correcting embodiment 10 of the present invention can also use in transmission network, frame type acquiring unit 11 can be judged frame type under the media data message content according to the marker marker bit in the media data message, can also decode to the media data message that receives, obtain frame type under the media data message content by the frame type of judging decoded media data.
The embodiment of the invention also provides a kind of forwarding controller 20, and this schematic representation of apparatus is referring to Fig. 5, and this forwarding controller 20 comprises:
Network performance acquiring unit 21 is used to obtain the network performance of Access Network, and network performance can comprise packet loss, delay, shake of Access Network etc.
Forward processing unit 22, be used for judging according to the network performance of Access Network the type of the error correction coding message flow that needs are transmitted, wherein the type of error correction coding message flow comprises that message content is the pairing error correction coding message flow of media data message of basic frame and the pairing error correction coding message flow of media data message that message content is predictive frame.
Sign acquiring unit 23 is used to obtain the identification information of the error correction coding message flow of needs forwarding;
Sign acquiring unit 23 obtains the identification information of the error correction coding message flow of needs forwarding by the identification information of preserving in the search index unit 25.
Apparatus of the present invention embodiment 20 can use in aforementioned transmission control method embodiment.
The embodiment of the invention also provides a kind of system of error correction coding, and referring to Fig. 6, this error correction coding system comprises:
Encoder for correcting 10 is used to obtain the frame type under the message content of media data message, and described frame type comprises basic frame and predictive frame; Media data message and the message content that to message content is basic frame is that the media datagrams literary grace of predictive frame is carried out error correction coding with different redundancys, and described message content is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than described message content;
Forwarding controller 20, be used for judging the type of the error correction coding message flow that needs are transmitted according to the network performance of Access Network, issue the forward command of the identification information of the error correction coding message flow that comprises described needs forwarding, so that described Access Network is according to the forwarding of described identification information realization to the error correction coding message flow.
In error correction coding system embodiment of the present invention, encoder for correcting 10 is after carrying out error correction coding to the media data message, the error correction coding message of 30 pairs of different redundancys of coding dispensing device uses different error correction coding message flows to send, forwarding controller 20 is judged the type of the error correction coding message flow that needs are transmitted according to the network performance of Access Network, and issues the forward command of the identification information of the error correction coding message flow that comprises described needs forwarding.
Forwarding unit in the access network is transmitted corresponding error correction coding message flow according to the forward command that receives.Owing to when issuing forward command, considered concrete access network environment, can transmit rational error correction coding message flow at access network environment, thereby can save the Internet resources of access network.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode of software with the general hardware platform of necessity, based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise that some instructions are with so that a computer equipment (can be a personal computer, the server or the network equipment etc.) the described method of execution each embodiment of the present invention.
More than error correction/encoding method provided by the invention and device, transmission control method and device and error correction coding system are described in detail, encoder for correcting embodiment of the present invention can use in the coded system of head end, also can use in transmission network, the type of media data is not limited to video data, it can also be other media data, the media data message includes but not limited to the RTP message, can also be other message of encoding and producing.It is to be noted, the present invention can also directly carry out error correction coding to media data, use the high error correction coding of redundancy to encode to the important frame in the media data, use the low error correction coding of redundancy to encode to the non-important frame in the media data, also can produce identical beneficial effect.For one of ordinary skill in the art, according to the thought of the embodiment of the invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (12)
1. an error correction/encoding method is characterized in that, comprising:
Obtain the affiliated frame type of message content of media data message, described frame type comprises basic frame and predictive frame;
Media data message and the message content that to message content is basic frame is that the media datagrams literary grace of predictive frame is carried out error correction coding with different redundancys, and described message content is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than described message content.
2. error correction/encoding method according to claim 1 is characterized in that, the described affiliated frame type of message content that obtains the media data message comprises:
Obtain the frame type under the message content of media data message according to frame type indication information, comprise the sequence number of the media data message at the sequence number of media data message at basic frame place and predictive frame place in the described frame type indication information from head end; Perhaps,
Judge the frame type under the message content of media data message according to the label information of described media data message or the media data message decoded, obtain the frame type under the message content of media data message by the frame type of judging decoded media data.
3. error correction/encoding method according to claim 1 and 2 is characterized in that, described is that media data message and the message content of basic frame is that the media datagrams literary grace of predictive frame is carried out error correction coding with different redundancys and is specially to message content:
To message content is that the media datagrams literary grace that the media data message of I frame, media data message that message content is the P frame and message content are the B frame is encoded with the error correction coding that redundancy reduces successively.
4. a transmission control method is characterized in that, comprising:
Obtain the network performance of Access Network;
Judge the type of the error correction coding message flow that needs are transmitted according to the network performance of Access Network, the type of described error correction coding message flow comprises that message content is the pairing error correction coding message flow of media data message of basic frame and the pairing error correction coding message flow of media data message that message content is predictive frame;
Obtain the described identification information that needs the error correction coding message flow of forwarding, issue the forward command that comprises described identification information, make described Access Network according to the forwarding of described identification information realization to the error correction coding message flow.
5. transmission control method according to claim 4 is characterized in that, the identification information of described error correction coding message flow is the payload type field of error correction coding header in the error correction coding message flow or the five-tuple information of network data newspaper.
6. transmission control method according to claim 4 is characterized in that, described network performance according to Access Network judges that the type of the error correction coding message flow that needs are transmitted is specially:
Packet loss at Access Network is less than or equal at 1% o'clock, and the content that E-Packets is the pairing error correction coding message flow of the media data message of basic frame; Otherwise the content that E-Packets is that pairing error correction coding message flow of the media data message of basic frame and message content are the pairing error correction coding message flow of media data message of predictive frame.
7. transmission control method according to claim 4 is characterized in that, the described identification information that obtains the error correction coding message flow that needs forwarding is specially:
Inquiry error correction coding message flow concordance list comprises message content and is the identification information of the pairing error correction coding message flow of media data message of basic frame and the identification information of the pairing error correction coding message flow of media data message that message content is predictive frame in the described error correction coding message flow concordance list.
8. an encoder for correcting is characterized in that, comprising:
The frame type acquiring unit is used to obtain the frame type under the message content of media data message, and described frame type comprises basic frame and predictive frame;
Coding unit, being used for message content is that media data message and the message content of basic frame is that the media datagrams literary grace of predictive frame is carried out error correction coding with different redundancys, and described message content is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than described message content.
9. encoder for correcting according to claim 8 is characterized in that, the affiliated frame type of message content that described frame type acquiring unit obtains the media data message comprises:
Obtain the frame type under the message content of media data message according to frame type indication information, comprise the sequence number of the media data message at the sequence number of media data message at basic frame place and predictive frame place in the described frame type indication information from head end; Perhaps,
Judge the frame type under the message content of media data message according to the label information of described media data message or the media data message decoded, obtain the frame type under the message content of media data message by the frame type of judging decoded media data.
10. a forwarding controller is characterized in that, comprising:
The network performance acquiring unit is used to obtain the network performance of Access Network;
Forward processing unit, be used for judging according to the network performance of Access Network the type of the error correction coding message flow that needs are transmitted, the type of described error correction coding message flow comprises that message content is the pairing error correction coding message flow of media data message of basic frame and the pairing error correction coding message flow of media data message that message content is predictive frame;
The sign acquiring unit is used to obtain the identification information of the error correction coding message flow of described needs forwarding;
Order issues the unit, is used to issue the forward command of the identification information that comprises described error correction coding message flow.
11. forwarding controller according to claim 10 is characterized in that, also comprises:
Indexing units is used to preserve the corresponding relation of the identification information of the type of described error correction coding message flow and described error correction coding message flow.
12. an error correction coding system is characterized in that, comprising:
Encoder for correcting is used to obtain the frame type under the message content of media data message, and described frame type comprises basic frame and predictive frame; Media data message and the message content that to message content is basic frame is that the media datagrams literary grace of predictive frame is carried out error correction coding with different redundancys, and described message content is that the redundancy of the pairing error correction coding of media data message of basic frame is the redundancy of the pairing error correction coding of media data message of predictive frame greater than described message content;
The coding dispensing device is used for using different error correction coding message flows to send through the error correction coding of the different redundancys behind the described encoder for correcting coding;
Forwarding controller, be used for judging the type of the error correction coding message flow that needs are transmitted according to the network performance of Access Network, issue the forward command of the identification information of the error correction coding message flow that comprises described needs forwarding, so that described Access Network is according to the forwarding of described identification information realization to the error correction coding message flow.
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| CN101072083A (en) * | 2007-06-04 | 2007-11-14 | 深圳市融合视讯科技有限公司 | Method for optimizing network data transmission redundancy error correction rate |
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