CN101610407B - Gateway realization method for converting Ethernet data and digital video streaming - Google Patents
Gateway realization method for converting Ethernet data and digital video streaming Download PDFInfo
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Abstract
The invention provides a gateway realization method for converting Ethernet data and digital video streaming. The method comprises the following steps: format of network data and format of television video streaming data are mutually converted, namely, interconversion between IP packet and MPEG-2 TS streaming; an embedded processor adopts combination of double buffering configuration and single buffering configuration and configures a boot operation script so that the two configurations are converted from one to another; the double buffering configuration evens flow rate at an IP processing layer and processes each buffer area by a plurality of threads; the single buffering configuration adopts a mode of data buffering under a driving procedure state; an upper layer application program ofan embedded system adopts a self-adaptive adjacency list method to automatically acquire the adjacency list in respective network segment and send the adjacency list to an opposite terminal to be converted; IP packet packaging thread and TS unlocking thread realize interconversion from IP format to TS format; and TS receiving thread and TS sending thread execute a complete reverse function in theembedded system. The two sides of wireless equipment can use IP address of the same net segment or the different network segments to work and realize long-distance bidirectional transmission or long-distance unidirectional transmission.
Description
Technical field
The present invention relates to a kind of gateway implementation method, be particularly related to and a kind ofly carry out IP (Internet Protocol based on ground digital television channels, the agreement that interconnects between the network) implementation method of Chuan Shu embedded gateway claims IP over TS (Transport Stream, transport stream) gateway again.Be used for the wireless Internet transmission.Can realize same network segment, single worker of inter-network section, duplex transmission.Support UDP (User Datagram Protocol, User Datagram Protoco (UDP)) and TCP (Transmission Control Protocol, transmission control protocol).
Background technology
From the framework of the Internet, the current situation of physical layer link has determined Internet development trend, and physical layer synergistic data link layer has been stipulated link property, transmission rate, packaged type and the error control etc. of transfer of data.Along with the development of digital TV network technology, become the focus of current internet physical layer link research based on the research of the internet data of digital TV network link transmission.Main purpose based on the transmission of the internet data of digital TV network is by utilizing existing digital television network to come transmission of IP data.
Therefore demand developing a kind of new Ethernet data and the gateway implementation method of digital video frequency flow conversion urgently, to solve the problem of carrying out work in the IP address of wireless device both sides use different segment.By coupling TS stream interface, carry out wireless transmission.
Summary of the invention
The objective of the invention is to,, use the IP address of different segment to carry out work in the wireless device both sides by the gateway implementation method of a kind of Ethernet data and digital video frequency flow conversion is provided.Adopt the encapsulation and the de-encapsulation method of new IP packet and TS packet, coupling TS stream interface is realized two-way and one-way transmission remote, High Data Rate by the TS modulator-demodulator.
The present invention adopts following technological means to realize:
A kind of gateway implementation method with Ethernet data and digital video frequency flow conversion is used the flush bonding processor that is connected with Ethernet, may further comprise the steps:
1.1. network data and digital TV video frequency flow data form are changed mutually, i.e. the mutual conversion of IP bag and MPEG-2TS stream;
1.2. adopt the combination of double buffering framework and single buffering framework in the described flush bonding processor, configuration start Run Script switches in two kinds of frameworks; Wherein the double buffering framework is to pass through two buffering area uniform fluxs at the IP processing layer, adopts a plurality of threads to come each buffering area is handled in uniform flux; Single buffering framework is the data buffering mode that adopts in the driver attitude;
1.3. in the upper level applications of embedded system, adopt self adaptation adjacency list method, obtain the adjacency list in the network segment separately automatically and send to the opposite end and exchange;
1.4. seal the conversion of wiring journey and TS deblocking thread realization IP and TS form by IP;
1.5. in embedded system, send thread execution reverse function completely by TS receiving thread and TS.
Self adaptation chained list method in aforesaid 1.3 may further comprise the steps:
2.1 system boot sends the address resolution protocol packet in the whole network section, will receive that in the regular hour host IP address that address resolution protocol is replied is recorded into counterfoil;
2.2 system's two ends exchange counterfoil, and loose table mapping of the counterfoil after will exchanging;
If reach the standard grade 2.3 main frame is arranged, main frame will send an address resolution protocol message and guarantee that the IP address do not conflict, the tabulation of system searching peer IP address if this IP address can be used, then adds this IP address the address list counterfoil and is ready for sending and revise message to the opposite end; If this IP address unavailable (there is this IP address in the opposite end), then system replys this address resolution protocol message and shows this IP unavailable (IP address exist conflict);
2.4 system is used for the main frame that poll rolls off the production line every every host broadcast address resolution protocol packet in several minutes clockwise networks and revises counterfoil simultaneously, and retouching operation is sent to the opposite end network.
IP in aforesaid 1.4 seals the wiring journey and TS deblocking thread may further comprise the steps:
Dress up the TS stream packets 3.1IP seal; At first, from the IP transmit queue, obtain the IP packet,, then continue to obtain if do not get access to the IP packet; The wait of thread and hang-up are decided by operating system, when getting access to an IP packet, begin to enter IP and are encapsulated as the TS thread; Recursive call encapsulation thread is up to fully the IP packet being repacked the packet into TS; The TS packet that packing is finished will be sent into the TS transmit queue and wait for that TS sends thread process;
3.2TS the stream packets deblocking is the IP bag; TS decapsulation thread receives to circulate the formation from TS and reads the TS frame; If the TS frame is when including first TS frame of IP packet, beginning recursive call TS decapsulation thread is up to obtaining complete IP packet; When obtaining complete IP packet, send the IP packet by sending sockets interface.
TS in aforesaid 1.5 sends thread and the TS receiving thread may further comprise the steps:
Be encapsulated as the TS thread with IP and have identical attribute 4.1.TS send thread, being starts working from the establishment of thread withdraws from or system exception up to main thread; TS sends the thread circulation and read packaged TS frame from the TS transmit queue, and call driver is sent the TS frame into driver and returned after completing successfully then;
4.2.TS receiving thread and TS send thread execution reverse function completely, data are obtained in the circulation of TS receiving thread from kernel, if successfully get access to the TS data and judge that its flag bit meets the transmission rule of IP packet, then data are put into TS and received formation, treat that TS decapsulation thread reads.
The gateway implementation method of a kind of Ethernet data of the present invention and digital video frequency flow conversion compared with prior art, has following remarkable advantages and beneficial effect:
Program in the flush bonding processor has adopted being used in combination of double buffering framework and single buffering framework.The double buffering framework comes uniform flux at the IP processing layer by two buffering areas.In uniform flux, adopt a plurality of threads to come each buffering area is handled, improve system effectiveness as far as possible.Save the expense of system thread scheduling, saved the expense that the buffering area lock and unlock is waited for simultaneously.
The use of in address resolution mechanism, innovating self adaptation adjacency list method.This method is based on the adjacency list method, but it has solved the problem that lacks flexibility in the adjacency list method.Self adaptation adjacency list method no longer needs manually to add up IP address and editor's adjacency list.It obtains the adjacency list in the network segment separately automatically and sends to the opposite end and exchanges, and being particularly suitable for provides wireless network to insert to mobile device and gadget.Self adaptation adjacency list method has also been avoided sending too much address information data and has been taken the valid data bandwidth simultaneously.
Description of drawings
Fig. 1 is a system block diagram of the present invention;
Main thread flow process figure in Fig. 2 (a) flush bonding processor;
Fig. 2 (b) is encapsulated as TS thread flow chart for IP;
Fig. 2 (c) sends the thread flow chart for TS;
Fig. 2 (d) is a TS receiving thread flow chart;
Fig. 2 (e) is descapsulated into IP traffic journey figure and IP data transmission flow figure for the TS data.
Fig. 3 is single buffer system software flow pattern;
Fig. 4 seals the process of assembling schematic diagram for modified model TS.
Embodiment
Below in conjunction with Figure of description embodiments of the invention are described further:
From macroscopic perspective, the present invention has and independently receives and dispatches path, has full duplex and single worker's working method.For the direction that changes into the TS flow data from the IP bag, the work of flush bonding processor is to obtain the IP packet, from concluding an agreement the IP bag is converted into the TS packet according to the present invention, and it is deposited in the buffering area.Interface controller reads the TS flow data from buffer memory then, and sends to the TS modulator with the TS punctual preface of failing to be sold at auction.For the direction that changes into IP from the TS flow data, interface controller at first grasps the data that the TS demodulator is sent here with fail to be sold at auction punctual preface of TS, and it is deposited in the buffer memory.Flush bonding processor is responsible for the TS reduction of data being become the IP bag and sending in the network then.
For protocol conversion gateway, system requires corresponding general application program less to output with the user imports configuration.Therefore, the framework of whole software carries out around the transmission and the systematic function optimization of data flow.The data flow of system has determined the flow process of software.Therefore whole system software is divided into two parts.First is the network handler that is in user's attitude or kernel state, main ARP (the Address Resolution Protocol that is responsible for, address resolution protocol) obtaining of the processing of agreement and IP packet, the inner simultaneously journey that opens new routes is come the mutual encapsulation of process IP data and TS data.Second portion is the interface controller drive part of finishing by buffering area and interruption.This part can be regarded the R-T unit of TS stream as, is used for handling the matching problem with external modem interface specially.System architecture diagram as shown in Figure 1.
The software configuration of system is decided by the flow direction of IP data and TS data, in each single-ended program, needs to consider simultaneously transmission and the problem that receives.Again because the data rate of Ethernet interface and TS interface does not match, simultaneously, the IP data are owing to exist problems such as congested, may cause the packet that receives in the short time excessive and too much and cause loss of data, thus need be with buffer system even transfer of data.
Program in the flush bonding processor has adopted being used in combination of double buffering framework and single buffering framework.The double buffering framework comes uniform flux at the IP processing layer by two buffering areas.In uniform flux, adopt a plurality of threads to come each buffering area is handled, improve system effectiveness as far as possible.Software flow is shown in Fig. 2 (a)-(e).Single buffering framework just adopts the strategy of data buffering in the driver attitude.Under this strategy, saved the expense of system thread scheduling, saved the expense that the buffering area lock and unlock is waited for simultaneously.The program flow diagram of single buffering as shown in Figure 3.
The use of in address resolution mechanism, innovating self adaptation adjacency list method.This method is based on the adjacency list method, but it has solved the problem that lacks flexibility in the adjacency list method.Self adaptation adjacency list method no longer needs manually to add up IP address and editor's adjacency list.It obtains the adjacency list in the network segment separately automatically and sends to the opposite end and exchanges, and being particularly suitable for provides wireless network to insert to mobile device and gadget.Self adaptation adjacency list method has also been avoided sending too much address information data and has been taken the valid data bandwidth simultaneously.Self adaptation adjacency list method is as follows:
(1) system boot, IP over TS equipment sends the ARP packet in the whole network section, and (10s) will receive that the host IP address that ARP replys is recorded into counterfoil in the regular hour.
(2) IP over TS two ends exchange counterfoil, and the counterfoil after will exchanging looses and shows mapping.
(3) if there is main frame to reach the standard grade, main frame will send an ARP message and guarantee that the IP address do not conflict.The tabulation of IP over TS system searching peer IP address if this IP address can be used, then adds this IP address the address list counterfoil and is ready for sending and revise message to the opposite end.If this IP address unavailable (there is this IP address in the opposite end).Then IP overTS system replys this ARP message and shows this IP unavailable (IP address exist conflict).
(4) IP over TS system is used for the main frame that poll rolls off the production line every every host broadcast ARP packet in 10 fens clockwise networks and revises counterfoil simultaneously, and retouching operation is sent to the opposite end network.
By above-mentioned four steps, IP over TS system just can know the address information at any time network two ends and confirm whether cheat, transmit packet.
The reference format of TS is formulated by MPEG2 (Motion Picture Experts Group, dynamic image expert group).Wherein the data type in the transport stream has been stipulated in PID (characteristic label) position.PID is 13 Bit datas of reserving in the TS frame head.For the first time counterfoil exchange and IP exchanges data, adopt and specify PID to be used for identifying.If add or delete a host information, the create-rule of PID is as follows:
PID 0b00000?0000?0000
Add: 0b00001 xxxx xxxx; Wherein xxxx xxxx shows host address.
Deletion: 0b00010 xxxx xxxx; Wherein xxxx xxxx shows host address.
Under the situation that this PID occurs, the data among the TS have only two types: a kind of is the load data bag that has the IP data, and another kind is the simple packet of revising message that sends.These two kinds of bags can encapsulate algorithm by IP and distinguish.Consider the problem of category-A and category-B address simultaneously, determine that by the computing of subnet mask what TS revise frame and determine a host address.Category-A address three TS frames of needs show the modification to a host address, and the category-B address needs two TS frames, and C class address needs one.
Self adaptation adjacency list method needs two original socket (socket) to come collaborative work.ARP socket is used for handling all relevant message of ARP.IP socket is used for catching all packets that mail to this MAC (Media Access Control, media interviews control) address.Simultaneously, the same with the adjacency list method, self adaptation adjacency list method is owing to rejected the mac layer frame header in the process of wireless channel transmission, IP packet of every transmission just can be saved the flow of 14 bytes in wireless channel like this, has further improved the effective rate of utilization of system channel.
4. at the redundant information that has 6 bytes in the ULE algorithm, the TS that the present invention proposes seals the dress algorithm redundant information is rejected, and PDU (data cell that can encapsulate) is packaged into self-defining SNDU (sub-network data units).Because the data of IP over TS system wireless Channel Transmission only comprise the IP data.Therefore need not the data type that extra information bit indicates transmission.The formation of whole SNDU is shown in the figure following table.
Type: 0x00 shows the IPv4 data.
0x11 shows the IPv6 data.
0x10 and 0x01 are for keeping.
Length: the length of indication IP datagram.Can express length is 2-14, much larger than the Ethernet MTU.
IP packet: the IP packet that flush bonding processor is caught.
The whole process of encapsulation is exactly the net load that the SNDU packing data is become to have regular length 184 bytes.Assisting simultaneously utilizes the special bit in the TS frame to encapsulate complete IP data.
Narrate the work of processor below in conjunction with flow chart.Shown in Fig. 2 (a), main thread is created network layer and is received socket when beginning, creates network layer simultaneously and sends socket.No matter because receive socket or sending socket all is operated in independently thread.For fear of too much locking and the loss system performance, thereby create respectively to receive socket and send socket and independently handle reception and send affairs.When receive socket and send socket create finish after, wrapper will be created by system.Afterwards, main thread begins recursive call socket receiver function and obtains network layer IP packet.When the IP packet was successfully caught, the IP packet of catching is sent into IP, and to receive formation etc. pending.
Shown in Fig. 2 (b), IP is encapsulated as the TS thread and circulates behind thread creation and carry out following task and know that system exception or thread withdraw from.At first, the encapsulation algorithm obtains an IP packet from the IP transmit queue, if do not get access to the IP packet, then continue to obtain.Thread wait and hang up and to decide by operating system.When getting access to an IP packet, begin to enter IP and be encapsulated as the TS algorithm.Recursive call encapsulation algorithm is up to fully the IP packet being repacked the packet into TS.The TS packet that packing is finished will be sent into the TS transmit queue and treat that TS sends thread process.
TS transmission thread is encapsulated as the TS thread with IP and has identical attribute, and they all are to start working from the establishment of thread to know that main thread withdraws from or system exception.Shown in Fig. 2 (c), TS sends the thread circulation and read packaged TS frame from the TS transmit queue, and call driver is sent the TS transmit frame into driver and known and return after completing successfully then.
TS obtains thread and TS sends thread execution reverse function completely, TS obtains thread recursive call function reading and obtain data from kernel, if it is effective successfully to get access to TS data and decision data, then data are put into TS and received formation, treat that TS is descapsulated into the IP thread and reads.This process is shown in Fig. 2 (d).
As Fig. 2 (e), TS decapsulation thread receives to circulate the formation from TS and reads the TS frame.If this TS frame is when including first TS frame of IP packet, beginning recursive call TS decapsulation algorithm is up to obtaining complete IP packet.When obtaining complete IP packet, send the IP packet by sending the socket interface.So far, packet calls in all of client layer and finishes.
As shown in Figure 4, wherein 1 indication is IP bag, 2 indications be first frame in the TS frame that is split into of this IP bag, 3 indications be second frame in the TS frame that is split into of this IP bag, 4 indications be N frame in the TS frame that is split into of this IP bag.The encapsulation and the deblocking algorithm specific implementation method of TS stream frame are as follows:
(1), constitutes first frame of TS stream from the data of preceding 184 bytes of SNDU intercepting.Set the start frame flag bit of TS frame head, setting frame PID is 0x177, and TS frame head counter is set at 1.The SNDU record length deducts 182.
(2) judge that SNDU length is if that smaller or equal to 0, algorithm withdraws from.If greater than 0, carry out (3).
(3) from the data of preceding 184 bytes of SNDU intercepting, constitute other frame of TS stream, setting frame PID is 0x177, TS frame head counter is set the last frame counter in position and is added 1.SNDU length deducts 184.Changing (2) over to carries out.
The arthmetic statement of decapsulation is as follows:
(1) judge TS frame head information, frame ID gives up if not 0x177, if TS frame head data start bit is set, begins from then on to read the IP data packet length in the frame.Deposit other data in buffering area.
(2) if the IP data packet length less than 182 bytes, program withdraws from.If greater than 182 bytes, receive next TS frame, judgement PID is 0x177.Judge TS frame head counter, do not add 1 rule, abandon this frame, and discharge the IP data buffer zone if do not satisfy.Add 1 rule if TS frame head counter satisfies, then receive this frame, the IP data length adds 184.Judge and read length less than the data length that receives, program withdraws from, otherwise (2) are carried out in circulation.
Claims (4)
1. the gateway implementation method of Ethernet data and digital video frequency flow conversion is used the flush bonding processor that is connected with Ethernet, it is characterized in that: may further comprise the steps:
1.1. network data and digital TV video frequency flow data form are changed mutually, i.e. the mutual conversion of IP bag and MPEG-2TS stream;
1.2. adopt the combination of double buffering framework and single buffering framework in the described flush bonding processor, configuration start Run Script switches in two kinds of frameworks; Wherein the double buffering framework is to pass through two buffering area uniform fluxs at the IP processing layer, adopts a plurality of threads to come each buffering area is handled in uniform flux; Single buffering framework is the data buffering mode that adopts in the driver attitude;
1.3. in the upper level applications of embedded system, adopt self adaptation adjacency list method, obtain the adjacency list in the network segment separately automatically and send to the opposite end and exchange;
1.4. seal the conversion of wiring journey and TS deblocking thread realization IP and TS form by IP;
1.5. in embedded system, send thread execution reverse function completely by TS receiving thread and TS.
2. the gateway implementation method of a kind of Ethernet data according to claim 1 and digital video frequency flow conversion, it is characterized in that: the self adaptation adjacency list method in the described step 1.3 may further comprise the steps:
2.1 system boot sends the address resolution protocol packet in the whole network section, will receive that in the regular hour host IP address that address resolution protocol is replied is recorded into counterfoil;
2.2 system's two ends exchange counterfoil, and loose table mapping of the counterfoil after will exchanging;
If reach the standard grade 2.3 main frame is arranged, main frame will send an address resolution protocol message and guarantee that the IP address do not conflict, the tabulation of system searching peer IP address if this IP address can be used, then adds this IP address the address list counterfoil and is ready for sending and revise message to the opposite end; If this IP address is unavailable, then system replys this address resolution protocol message and shows that this IP is unavailable;
2.4 system is used for the main frame that poll rolls off the production line every every host broadcast address resolution protocol packet in several minutes clockwise networks and revises counterfoil simultaneously, and retouching operation is sent to the opposite end network.
3. the gateway implementation method of a kind of Ethernet data according to claim 1 and digital video frequency flow conversion is characterized in that IP in 1.4 seals the wiring journey and TS deblocking thread may further comprise the steps:
Dress up the TS stream packets 3.1IP seal; At first, from the IP transmit queue, obtain the IP packet,, then continue to obtain if do not get access to the IP packet; The wait of thread and hang-up are decided by operating system, when getting access to an IP packet, begin to enter IP and are encapsulated as the TS thread; Recursive call encapsulation thread is up to fully the IP packet being repacked the packet into TS; The TS packet that packing is finished will be sent into the TS transmit queue and wait for that TS sends thread process;
3.2TS the stream packets deblocking is the IP bag; TS deblocking thread receives to circulate the formation from TS and reads the TS frame; If this TS frame is when including first TS frame of IP packet, beginning recursive call TS deblocking thread is up to obtaining complete IP packet; When obtaining complete IP packet, send the IP packet by sending sockets interface.
4. the gateway implementation method of a kind of Ethernet data according to claim 1 and digital video frequency flow conversion is characterized by and is: the TS in described 1.5 sends thread and the TS receiving thread may further comprise the steps:
Seal the wiring journey with IP and have identical attribute 4.1.TS send thread, being starts working from the establishment of thread withdraws from or system exception up to main thread; TS sends the thread circulation and read packaged TS frame from the TS transmit queue, and call driver is sent the TS frame into driver and returned after completing successfully then;
4.2.TS receiving thread and TS send thread execution reverse function completely, data are obtained in the circulation of TS receiving thread from kernel, if successfully get access to the TS data and judge that its flag bit meets the transmission rule of IP packet, then data are put into TS and received formation, treat that TS deblocking thread reads.
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| CN101807162B (en) * | 2010-03-25 | 2013-08-07 | 青岛海信电器股份有限公司 | Method for reducing module coupling degree of embedded software system and embedded software system |
| CN103763749A (en) * | 2013-12-06 | 2014-04-30 | 中国人民解放军理工大学 | TS-IP routing module and broadcast routing system |
| CN107977326A (en) * | 2017-11-13 | 2018-05-01 | 广州市雅江光电设备有限公司 | DMX data double buffering method, apparatus |
| CN108306926B (en) * | 2017-11-30 | 2021-08-13 | 深圳市科列技术股份有限公司 | Method and device for pushing gateway service data of Internet of vehicles equipment |
| CN109450875B (en) * | 2018-10-23 | 2020-02-07 | 清华大学 | MAC layer packaging method and device |
| CN109560857A (en) * | 2018-11-26 | 2019-04-02 | 四川安迪科技实业有限公司 | Grouping polling method based on satellite communication |
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