CN104427385A - Video coding device, vehicle-mounted video playing system and ring network operation method - Google Patents
Video coding device, vehicle-mounted video playing system and ring network operation method Download PDFInfo
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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
- H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
- H04N21/64738—Monitoring network characteristics, e.g. bandwidth, congestion level
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
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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
- H04N21/643—Communication protocols
-
- 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
- H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
- H04N21/6473—Monitoring network processes errors
Abstract
The invention relates to a video coding device, a correlation ring network, a vehicle-mounted video playing system and a ring network operation method. The video coding device comprises a video coding module with a video coding function and a data exchange module with a switch function. The vehicle-mounted video playing system utilizes the video coding device for networking of the ring network. The technical advantages are as follows: a redundancy backup function is added to the video playing system, in case that a fault occurs in a certain link in a network, the ring network can be rapidly recovered, normal video communication is still performed, and the video transmission reliability is improved.
Description
Technical field
The present invention relates to and utilize a kind of Video transmission system that the video coding apparatus of looped network sets up subway high reliability of supporting, by introducing video network monitoring function, video network can be made to transmit and obtain backup guarantee.
Background technology
At present, urban rail transit in China is fast-developing, effectively alleviates urban traffic pressure.Passenger information system (PIS) is an emerging system in subway, and PIS relies on multimedia technology, Video coding, transmission technology and network technology etc.Vehicle carrying video system has become the important component part of PIS system, can provide vehicle real time status information, safety instruction information, website information, news entertainment information etc. to passenger on car, for passenger safety on car, in order, happiness has significant role by bus.
Track train there is various control signal, status signal needs transmission, therefore, ensureing that the stability improving Signal transmissions under the prerequisite of laser propagation effect has very important significance.
Current vehicle carrying video system transmission method adopts digital data transmission method, and digital data transmission is divided into again concentration of transmissions, distributed transmission.Concentration of transmissions is from encoder respectively to each decoder individual transmission digital signal, distributed transmission be encoder digital signal by decoder one by one to front transfer, to the last a Decoder accepts is to digital signal.The common drawback of these two kinds of transmission methods is, when there is link failure in network, the video communication on this link will be interrupted, irrecoverable, can bring great inconvenience like this to passenger.
Summary of the invention
The present invention is directed to the technical problem existed in above-mentioned background technology, propose a kind of support looped network video coding apparatus and corresponding looped network, Vehicular video Play System and loop-net operation method.
The technical problem that the present invention solves comprises: in the audio/video player system of subway, adopt looped network mode to carry out networking, increase the redundant backup function of audio/video player system, when realizing a certain link failure in network, looped network can quick-recovery soon, makes video still can proper communication.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Support a video coding apparatus for looped network, this device comprises the video encoding module with Video coding function, the data exchange module with switch function; Described video encoding module comprises USB interface and audio interface, video encoder chip, network interface, described video encoding module is by USB interface and audio interface receiver, video and voiceband data signal, and described video encoder chip is responsible for carrying out compressed encoding to the audio frequency and video received; Described data exchange module comprises CPU and exchange chip, and described data exchange module receives the Audio and Video data after compressed encoding by the network interface be connected with video encoding module, and directly these data is forwarded by exchange chip; Described data exchange module can send and receive looped network health detection message, detects the health status of link, the stable operation of its CPU part control ring fidonetFido.
A kind of looped network, described looped network comprises a host node and at least one transmission node, and the host node of this looped network is the video coding apparatus of above-mentioned support looped network, and described host node is specially appointed exclusive node in a loop, is responsible for ring health status and detects; Described transmission node is other nodes in looped network except host node, be responsible for receiving and forward Audio and Video data that node sends, health detection message that forwarding host node sends.
Wherein, the video coding apparatus of described support looped network can run looped network agreement; Described transmission node device is Video Decoder, and transmission node does not run looped network agreement.
Described host node has two port access looped network networks, is respectively the first port and the second port; Two ports of described host node, when looped network is normal, give tacit consent to that the first port is in Forward state, the second port is in Block state; The first port being in Forward state sends health detection message, Audio and Video data, the second port being in Block state receives only health detection message, second port is in the state that logic disconnects, block the transmission of non-loop network control message, make Audio and Video data can not form ring in a network, avoid the generation of storm in looped network.
Described host node uses two timers when sending and receive looped network health detection message, comprises hello timer and failed timer; Described hello timer defines the timer that host node first port sends the time interval of health detection message; Described failed timer is the timer of the time-out time defining host node second port accepts health detection message.
Described ring health detection message is loop network control message unique in this looped network, and this message adopts the standard message form of IEEE802.1d on message format.
A kind of Vehicular video Play System, utilizes the video coding apparatus of above-mentioned support looped network, sets up into above-mentioned looped network.
A video coding apparatus in above-mentioned vehicle-mounted Play System, has data exchange module, and described data exchange module has CPU and exchange chip.
A loop-net operation method for above-mentioned Vehicular video Play System, it comprises the steps:
(1) open looped network task, read the initialized configuration information of looped network, comprising: looped network is enable, looped network node role, looped network port role, hello timer time, failed timer time etc.;
(2) support that the video coding apparatus of looped network runs looped network agreement:
After looped network task start completes, the task of looped network its enable port status scan, supports the connection status of CPU poll looped network inner port in every 10ms of the video coding apparatus of looped network; Support that the looped network state of two ports of the video coding apparatus of looped network starts all to be in Block state most, when the connection status of port is converted to LINK_UP by LINK_DOWN, the looped network state of port will be Forward state by Block State Transferring; When in looped network, two ports are all LINK_UP state, system can start hello timer timer0, sends ring health detection message at set intervals, and starts failed timer timer1, whether overtimely judges to receive ring health detection message; When there being a port to be LINK_DOWN, system will close hello timer and failed timer simultaneously;
System sends two kinds of ring health detection message according to the state of looped network and message is all send from the port of Forward state; When looped network is in health state, system sends the healthy hello packet of ring from the first port of looped network, and when looped network is in failed state, system sends ring inefficacy hello packet from two ports of looped network simultaneously; If system receives the healthy hello packet oneself sent within the failed timer timer1 time, illustrate that looped network is in health status, restart failed timer, detect the situation next time receiving message; If system receives the inefficacy hello packet oneself sent in failed timer time, loop network link trouble shooting is described, return to health status, now transfer ring status to health status, block the second port, empty the mac address table of two ports, host node starts to send the healthy hello packet of ring, and restart failed timer, detect the situation next time receiving message; If receive ring health detection message time-out, illustrate that loop network link breaks down, looped network state is switched to failure state;
When loop network link fault and link-recovery, system is separate to process to link direct-connected with host node in looped network and indirectly connected link, for direct connected link, system detects Link State fast by LINK_DOWN and the LINK_UP state of port status scan task scanning port; For indirectly connected link, whether system is overtime according to reception ring health detection message, judges the Link State of looped network;
When loop network link breaks down, if the link broken down is the direct connected link of host node, looped network state can be set to failed by system, and the related port of host node is set to Block state, empty the mac address of looped network port, and close hello timer and failed timer; If indirectly connected link, system acceptance ring health detection message time-out, switches to failed state by looped network state, and the second port is set to Forward state;
When loop network link recovers normal, if link is the direct connected link of host node, the related port of host node can be set to Forward state by system, empties mac address, if now two ports are all LINK_UP, system reboot hello timer and failed timer; If indirectly connected link, system can receive ring health detection message in failed timer time, and looped network state is switched to health state.
Wherein, the time configuring failed timer is more than or equal to 3 times of hello timer time.
The invention has the beneficial effects as follows, add the redundant backup function of Vehicular video Play System, improve stability and the reliability of audio/video player system.
Vehicular video Play System uses a continuous print ring video coding apparatus and all Video Decoders of supporting looped network to be linked together, and it can ensure to support that the Audio and Video data that the video coding apparatus of looped network sends can arrive all Video Decoders.When there is the situation of cable disconnecting in looped network network, support that the video coding apparatus of looped network can not receive ring health monitoring message in failed timer time, link failure will be confirmed, support that the video coding apparatus of looped network activates its Backup Port, make network service recover normal to run, guarantee video normal play.
accompanying drawing explanation
Fig. 1 be Vehicular video Play System loop network link normal time topological diagram and data move towards signal.
When Fig. 2 is Vehicular video Play System loop network link fault, topological diagram and data move towards signal.
Fig. 3 is hardware structure diagram of the present invention.
Fig. 4 is the agent structure of looped network agreement.
Fig. 5 is ring network host node flow process.
Fig. 6 be loop network link roadblock and link-recovery time host node flow process.
embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described, but the present invention is not limited thereto.Present invention resides in the various scheme that describes in specification and the reasonable combination by the various measures mentioned in this specification.
The video coding apparatus structure supporting looped network as shown in Figure 3, comprises video encoding module, data exchange module.Support that the video coding apparatus of looped network is the set of video encoder and switch on hardware, video encoder is video encoding module, switch is data exchange module, video encoding module and data exchange module are be connected by network interface on hardware, and video encoding module sends Audio and Video data to data exchange module by network interface.
Video encoding module comprises USB interface and audio interface, video encoder chip, network interface.Video encoding module is by USB interface and audio interface receiver, video and audio signal; Video encoder chip is responsible for carrying out compressed encoding to receiving video and audio signal; The network interface of video encoding module is connected with the network interface of data exchange module, and the Audio and Video data after compressed encoding are sent to data exchange module by this network interface by video encoding module.Described video encoding module, does not need the support of software, completes above function completely by hardware.
Data exchange module comprises CPU and exchange chip.Data exchange module receives the Audio and Video data after compressed encoding by the network interface be connected with video encoding module, and these data directly forward by exchange chip, does not need transmitted to CPU to process; The operation of CPU part control ring fidonetFido, detects the health status of link by sending and receive ring health detection message.
As shown in Figure 1, a kind of Vehicular video Play System of loop network, this system comprises video coding apparatus, Video Decoder, the display of supporting looped network.This Vehicular video Play System, utilizes and supports the video coding apparatus of looped network, is carried out the networking of looped network by the mode of cascade and Video Decoder.In this Vehicular video Play System, the transmission means of Audio and Video data is: support that the video coding apparatus of looped network is by USB interface and audio interface receiver, video and voice data, and carry out compressed encoding to the Audio and Video data received; Support that the Audio and Video data after compressed encoding are sent in loop network by the network interface accessing looped network by the video coding apparatus of looped network, forward to next Video Decoder after each Video Decoder accepts to Audio and Video data, to the last a Video Decoder receives the Audio and Video data after compressed encoding again; After the Audio and Video data of each Video Decoder after receiving compressed encoding, the display of connected display will be sent after decoding data to.
As shown in Figure 1, when Vehicular video Play System loop network link is normal, support that the first port of the video coding apparatus of looped network is in Forward state, the second port is in Block state.Audio and Video data are transmitted by primary link, and are in the state that logic disconnects due to backup link, prevent the transmission of non-loop network control message, doing so avoids the winding transmission of Business Stream in looped network and cause the problem of storm.
Support that the video coding apparatus of looped network is by the first port timed sending ring health detection message, when ring health detection message arrives Video Decoder, do not run looped network agreement due to Video Decoder and only identify video data, ring health detection message is regarded unknown Message processing, be broadcast, by the broadcast of Video Decoder in looped network, ring health detection message is finally sent to the second port of the video coding apparatus supporting looped network.If the second port receives ring health detection message in official hour, illustrate that loop network link is normal.
As shown in Figure 2, time breaking down in the somewhere of the primary link of Vehicular video Play System looped network, support that the second port of the video coding apparatus of looped network can not receive the ring health detection message of the first port transmission in official hour, at this moment loop network link breaks down to support the code device of looped network just to think, second port will be set to Forward state, enable backup link.At this moment, Audio and Video data send from two ports of the video coding apparatus supporting looped network simultaneously, and arrive each Video Decoder, so just can ensure that the communication in network is normal.When after the trouble shooting in link, looped network can return to the state shown in Fig. 1 again.
The relational language of looped network agreement of the present invention is as follows:
Host node (Master): specially appointed exclusive node in a loop, is responsible for ring health status and detects, refer to the video coding apparatus supporting looped network in vehicle carrying video system.
Transmission node (Transit): the node in looped network except host node, is responsible for the health detection message that forwarding host node sends, in this video onboard system, refers to Video Decoder.
First port (First Port): working port, is responsible for transfer of data when looped network is normal.
Second port (Second Port): backup port, when network failure appears in the first port, will enable the port and carry out transfer of data.
Health detection message (Hello Message): host node timing is continuous to be sent, in order to detection loop health status to looped network.In looped network of the present invention, only have this kind of control message, this message adopts the standard message form of IEEE802.1d on message format.
Hello timer (Timer0): definition host node first port sends the timer in the time interval of health detection message.
Failed timer (Timer1): the timer of the time-out time of definition host node second port accepts health detection message.
The workflow of looped network of the present invention is as follows:
As shown in Figure 4, first open looped network task, read the initialized configuration information of looped network, comprising: looped network is enable, looped network node role, looped network port role, hello timer time, failed timer time etc.Preferably, the time configuring failed timer is greater than or equals 3 times of hello timer time.In this looped network, only have host node to run looped network agreement, transmission node does not run looped network agreement, so this looped network only runs the host node flow process of looped network at host node, does not perform transmission node flow process.
The video coding apparatus of support looped network runs looped network agreement and is host node, so run host node flow process, as shown in Figure 5.After looped network task start completes, looped network can the task of its enable port status scan, support the video coding apparatus of looped network CPU can in every 10ms the connection status of a poll looped network inner port.Support that the looped network state of two ports of the video coding apparatus of looped network starts all to be in Block state most, when the connection status of port is converted to LINK_UP by LINK_DOWN, the looped network state of port will be Forward state by Block State Transferring.When in looped network, two ports are all LINK_UP state, system can start hello timer timer0, sends ring health detection message at set intervals, and starts failed timer timer1, whether overtimely judges to receive ring health detection message.When there being a port to be LINK_DOWN, system will close hello timer and failed timer simultaneously.
System sends two kinds of ring health detection message according to the state of looped network and message is all send from the port of Forward state, when looped network is in health state, system sends the healthy hello packet of ring from the first port of looped network, when looped network is in failed state, system sends ring inefficacy hello packet from two ports of looped network simultaneously.If system receives the healthy hello packet oneself sent within the failed timer timer1 time, illustrate that looped network is in health status, restart failed timer, detect the situation next time receiving message.If system receives the inefficacy hello packet oneself sent in failed timer time, loop network link trouble shooting is described, return to health status, now transfer ring status to health status, block the second port, empty the mac address table of two ports, host node starts to send the healthy hello packet of ring, and restart failed timer, detect the situation next time receiving message.If receive ring health detection message time-out, illustrate that loop network link breaks down, looped network state is switched to failure state.
As shown in Figure 6, be loop network link fault and link-recovery time, the handling process of host node.System is separate to process to link direct-connected with host node in looped network and indirectly connected link, and for direct connected link, system detects Link State fast by LINK_DOWN and the LINK_UP state of port status scan task scanning port; For indirectly connected link, whether system is overtime according to reception ring health detection message, judges the Link State of looped network.
When loop network link breaks down, if the link broken down is the direct connected link of host node, looped network state can be set to failed by system, and the related port of host node is set to Block state, empty the mac address of looped network port, and close hello timer and failed timer.If indirectly connected link, system acceptance ring health detection message time-out, switches to failed state by looped network state, and the second port is set to Forward state.
When loop network link recovers normal, if link is the direct connected link of host node, the related port of host node can be set to Forward state by system, empties mac address, if now two ports are all LINK_UP, system reboot hello timer and failed timer.If indirectly connected link, system can receive ring health detection message in failed timer time, and looped network state is switched to health state.
These are only the preferred embodiments of the present invention, be not limited to the present invention; To those skilled in the art, the present invention can have various modifications and variations, and all within the present invention's spirit and principle, any amendment done, equivalent replacement, improvement etc., all should be included within scope.
Claims (10)
1. support a video coding apparatus for looped network, this device comprises the video encoding module with Video coding function, the data exchange module with switch function; Described video encoding module comprises USB interface and audio interface, video encoder chip, network interface, described video encoding module is by USB interface and audio interface receiver, video and voiceband data signal, and described video encoder chip is responsible for carrying out compressed encoding to the audio frequency and video received; Described data exchange module comprises CPU and exchange chip, and described data exchange module receives the Audio and Video data after compressed encoding by the network interface be connected with video encoding module, and directly these data is forwarded by exchange chip; Described data exchange module can send and receive looped network health detection message, detects the health status of link, the stable operation of its CPU part control ring fidonetFido.
2. a looped network, described looped network comprises a host node and at least one transmission node, the host node of this looped network is the video coding apparatus of support looped network according to claim 1, and described host node is specially appointed exclusive node in a loop, is responsible for ring health status and detects; Described transmission node is other nodes in looped network except host node, be responsible for receiving and forward Audio and Video data that node sends, health detection message that forwarding host node sends.
3. looped network according to claim 2, is characterized in that, the video coding apparatus of described support looped network can run looped network agreement; Described transmission node device is Video Decoder, and transmission node does not run looped network agreement.
4. the looped network according to Claims 2 or 3, is characterized in that, described host node has two port access looped network networks, is respectively the first port and the second port; Two ports of described host node, when looped network is normal, give tacit consent to that the first port is in Forward state, the second port is in Block state; The first port being in Forward state sends health detection message, Audio and Video data, the second port being in Block state receives only health detection message, second port is in the state that logic disconnects, block the transmission of non-loop network control message, make Audio and Video data can not form ring in a network, avoid the generation of storm in looped network.
5. looped network according to claim 4, is characterized in that, described host node uses two timers when sending and receive looped network health detection message, comprises hello timer and failed timer; Described hello timer defines the timer that host node first port sends the time interval of health detection message; Described failed timer is the timer of the time-out time defining host node second port accepts health detection message.
6. looped network according to claim 5, is characterized in that, described ring health detection message is loop network control message unique in this looped network, and this message adopts the standard message form of IEEE802.1d on message format.
7. a Vehicular video Play System, is characterized in that, utilizes the video coding apparatus of the support looped network described in claim 1, sets up into according to described looped network arbitrary in claim 2-6.
8. the video coding apparatus in vehicle-mounted Play System according to claim 7, have data exchange module, described data exchange module has CPU and exchange chip.
9. a loop-net operation method for Vehicular video Play System according to claim 7, it comprises the steps:
(1) open looped network task, read the initialized configuration information of looped network, comprising: looped network is enable, looped network node role, looped network port role, hello timer time, failed timer time etc.;
(2) support that the video coding apparatus of looped network runs looped network agreement:
After looped network task start completes, the task of looped network its enable port status scan, supports the connection status of CPU poll looped network inner port in every 10ms of the video coding apparatus of looped network; Support that the looped network state of two ports of the video coding apparatus of looped network starts all to be in Block state most, when the connection status of port is converted to LINK_UP by LINK_DOWN, the looped network state of port will be Forward state by Block State Transferring; When in looped network, two ports are all LINK_UP state, system can start hello timer timer0, sends ring health detection message at set intervals, and starts failed timer timer1, whether overtimely judges to receive ring health detection message; When there being a port to be LINK_DOWN, system will close hello timer and failed timer simultaneously;
System sends two kinds of ring health detection message according to the state of looped network and message is all send from the port of Forward state; When looped network is in health state, system sends the healthy hello packet of ring from the first port of looped network, and when looped network is in failed state, system sends ring inefficacy hello packet from two ports of looped network simultaneously; If system receives the healthy hello packet oneself sent within the failed timer timer1 time, illustrate that looped network is in health status, restart failed timer, detect the situation next time receiving message; If system receives the inefficacy hello packet oneself sent in failed timer time, loop network link trouble shooting is described, return to health status, now transfer ring status to health status, block the second port, empty the mac address table of two ports, host node starts to send the healthy hello packet of ring, and restart failed timer, detect the situation next time receiving message; If receive ring health detection message time-out, illustrate that loop network link breaks down, looped network state is switched to failure state;
When loop network link fault and link-recovery, system is separate to process to link direct-connected with host node in looped network and indirectly connected link, for direct connected link, system detects Link State fast by LINK_DOWN and the LINK_UP state of port status scan task scanning port; For indirectly connected link, whether system is overtime according to reception ring health detection message, judges the Link State of looped network;
When loop network link breaks down, if the link broken down is the direct connected link of host node, looped network state can be set to failed by system, and the related port of host node is set to Block state, empty the mac address of looped network port, and close hello timer and failed timer; If indirectly connected link, system acceptance ring health detection message time-out, switches to failed state by looped network state, and the second port is set to Forward state;
When loop network link recovers normal, if link is the direct connected link of host node, the related port of host node can be set to Forward state by system, empties mac address, if now two ports are all LINK_UP, system reboot hello timer and failed timer; If indirectly connected link, system can receive ring health detection message in failed timer time, and looped network state is switched to health state.
10. loop-net operation method according to claim 9, is characterized in that:
The time of configuration failed timer is more than or equal to 3 times of hello timer time.
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Cited By (1)
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| CN107071356A (en) * | 2017-04-17 | 2017-08-18 | 上海增容数据科技有限公司 | A kind of multimedia optimization server and its video information processing method |
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