CN104717535B - A kind of conversion method of subway train media playback mode - Google Patents
A kind of conversion method of subway train media playback mode Download PDFInfo
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- CN104717535B CN104717535B CN201510107605.5A CN201510107605A CN104717535B CN 104717535 B CN104717535 B CN 104717535B CN 201510107605 A CN201510107605 A CN 201510107605A CN 104717535 B CN104717535 B CN 104717535B
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- play mode
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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
- H04N21/4143—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a Personal Computer [PC]
-
- 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
- H04N21/64—Addressing
Abstract
A kind of conversion method of subway train media playback mode, belongs to embedded computer field.This method is realized by 3 modules, is initialization module, live transcription broadcasting module, recorded broadcast relay broadcasting/living broadcast module respectively.Initialization module carries out the initialization of communication thread, recorded broadcast thread, real time video data stream receiving thread, carries out local video file verification, opens recorded broadcast and plays.Live transcription broadcasting module and recorded broadcast relay broadcasting/living broadcast resume module heartbeat signal and emergency message, receive real time video data stream, read actual frame loss rate, and are judged using stagnant ring mode, to decide whether to play out the conversion of pattern.The present invention can be applicable in subway train media player, it is ensured that in the case where wireless network environment is severe, realizes the smooth playing of real time video data stream, and avoids broadcasting from jolting.
Description
Technical field
The invention belongs to embedded computer field, is related to a kind of conversion method of subway train media playback mode.
Background technology
City underground engineering includes a variety of projects under construction and complicated technology, except the safety high speed of railcar to be ensured is transported
Outside row, it is also necessary to which the constantly improve of related Related service facility, media play are exactly one of content therein.Media play system
System receives the information on services of network transmission using computer as core, then these information the processing such as encoded to, decoded, finally
Information service is provided to passenger using vehicle-mounted display terminal as medium, so as to ensure passenger safety, easily take track traffic.Matchmaker
Body play system will not only receive and promptly intercut the emergency warning information of ground control centre, as fire, obstruction and terror are attacked
The special hazard such as hit, also to play Passenger Notice, train arrival and leaving time, manager's bulletin, government notice, stock information, media
The real-time dynamic multimedia messages such as news, live game coverage, advertisement.
Fig. 1 is the structured flowchart of media play system, and it is mainly by the media player in train operator room, train
Broadcast Controller, onboard wireless receiver, video encoder and Video Decoder in train passenger compartment, receive card and vehicle-mounted
Display terminal is built, wherein, media player is the nucleus module of whole media play system.Media player hardware base
Designed in the high-performance embedded processor ATOMD510 of Intel Company, extend network interface, CF card interfaces, USB interface and
USB interface.Media-player software uses embedded OS Windows Embedded XP, integrates on an operating system
Driver of sound card and video driver.The application layer of software receives skill using Direct Show development technique and VLC real-time streams
Art, to realize the broadcasting to active multi-media information.Media player network interface be used for handle with broadcasting for train controller and
The communication of onboard wireless receiver, media player obtain the operation of media play system by being communicated with broadcasting for train controller
Pattern：(this operational mode is set by driver and pass on by broadcasting for train controller to media play for automatic or pressure recorded broadcast
Device) pattern.In automatic mode, media player can automatically select record according to the change of network congestion degree and fluency demand
Broadcast or real-time live broadcast play mode.In the case where forcing recorded broadcast pattern, media player can only carry out recorded broadcast broadcasting.Media player
Obtain ground control centre by being communicated with onboard wireless receiver and be sent to the data of train, including real time video data stream,
The real time video data stream of user's setting allows frame loss rate and needs dangerous situation, the notice promptly intercutted.Pass through CF card interfaces and USB
The movable storage devices such as CF cards, USB flash disk can be accessed media play system, realized to being deposited outside CF cards, USB flash disk etc. by interface, user
The broadcasting of the media file preserved in storage equipment.USB interface is connected to output and the video encoder of media player video card
Input, the display image information digitally generated inside processor, by the digital/analog converter in video card be changed into R,
G, B tricolor signals and row, field sync signal, coding is compressed into video encoder via USB interface, then in ether
It is transmitted on the net.When coded data reaches guest room, decoded by Video Decoder, car-mounted display end is sent into via receiving to block
Hold final display image.
Media player support play HD video, can realize recorded broadcast, live two kinds of play mode automatic identification and
Switching.Traditional media players realize the method for play mode automatic conversion is mostly based on network whether have real time video data
Stream, it is contemplated that underground railway track traffic circulation environment has a uncertainty, subway at any time may crossing-river tunnel, overpass etc. it is wireless
The very severe location of network environment, ground level control room to the radio communication quality between onboard wireless receiver can not ensure,
This results in that onboard wireless receiver is transmitted to the real time video data stream of media player and emergency message intercuts signal and had
Unstability, after traditional media players detect that real time video data stream interrupts, recorded broadcast pattern can be automatically switched to, if nothing
Line signal then can cause media play system to switch repeatedly under recorded broadcast and live-mode off and on, it is this jolt be passenger without
What method was endured；Media player after improvement can add video data buffering, avoid broadcasting to a certain extent and jolt,
But due to buffering area to be filled up, video cardton delay issue will be caused when being switched to real-time video play mode.Therefore, exist
Under severe wireless network environment, how to avoid video playback from jolting and ensure that smooth play of real-time video turns into one and important asked
Topic.The present invention is permitted by the actual frame loss rate of sample detecting real time video data stream according to what actual frame loss rate and user set
Perhaps frame loss rate is avoided broadcasting from jolting and is realized video smooth playing using a kind of Hysteresis control strategy.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of conversion method of subway train media playback mode.Ensure
In the case that wireless network environment is severe, it can also realize media play system without the smooth playing video to jolt.
Technical scheme：
The conversion method overall procedure of vehicle-mounted media play mode three modules as shown in Fig. 2 be mainly made up of：Initialization
Module, live transcription broadcasting module and recorded broadcast relay broadcasting/living broadcast module.
In initialization procedure, after media play system starts, media player initializes communication socket first, opens
Log recording, broadcast window is initialized, carry out local video file md5 verifications, load and play queue, establish and play link, open
Dynamic recorded broadcast thread commences play out local video, and then media player can be opened and broadcasting for train controller and onboard wireless reception
The communication thread of device, live configuration file is read, obtain local network interface card information and open real time video data stream receiving thread.So
Afterwards, media player judges whether system is currently in live-mode, and according to judged result enter live transcription broadcasting module or
Person's recorded broadcast relay broadcasting/living broadcast module.
It is live transcription broadcasting module in, media player first determine whether broadcasting for train controller setting play mode whether
To be automatic and the heartbeat signal of onboard wireless receiver can be received, if the play mode of setting is not automatic or can not
The heartbeat signal of onboard wireless receiver is received, then media player directly changes play mode and continues to judge into recorded broadcast and return
Whether system is currently live-mode；Otherwise, media player starts to parse the heartbeat signal of onboard wireless receiver, obtains and uses
The real time video data stream of family setting allows frame loss rate, detects and handles the emergency message demand of onboard wireless receiver.Then,
The actual frame loss rate of real time video data stream is detected, next, media player is according to actual frame loss rate and allows frame loss rate to enter
Whether row meets the live judgement for transcribing condition of broadcasting, and this process is by performing a kind of play mode based on Hysteresis control strategy
Change to realize, as shown in Figure 3.In 5s time ranges, it is all higher than allowing to lose if sampling obtained actual frame loss rate every time
Condition establishment is broadcast in frame per second, then live transcription, and media player change play mode, and into recorded broadcast and return, to continue judgement system current
Whether play mode is live；If the condition is invalid, media player keeps live play pattern constant and started next
Wheel circulation, then judge broadcasting for train controller setting play mode whether be it is automatic and can receive onboard wireless receive
The heartbeat signal of device.
In recorded broadcast relay broadcasting/living broadcast module, media player first determine whether broadcasting for train controller setting play mode whether
To be automatic and the heartbeat signal of onboard wireless receiver can be received, if the play mode of setting is not automatic or can not
Onboard wireless receiver heartbeat signal is received, then media player keeps recorded broadcast play mode constant, and continues to play mould
Formula judges and heartbeat signal judges.Otherwise, media player starts to parse heartbeat signal, obtains the real-time stream of user's setting
Allow frame loss rate, detect and handle the emergency message demand of onboard wireless receiver.Next, media player sampling is actually lost
Frame per second, by it with allowing frame loss rate to be contrasted, realize that play mode is changed by Hysteresis control strategy, as shown in Figure 3.In 5s
In time range, if the actual frame loss rate sampled every time, which is respectively less than, allows frame loss rate, recorded broadcast relay broadcasting/living broadcast condition is set up, media
Whether player changes play mode and continues to judge system current play mode to be live into live and return.Otherwise, media are broadcast
Put device to keep recorded broadcast play mode constant and start next round circulation, continue play mode and heartbeat signal judges.
The beneficial effects of the present invention are the actual frame loss rate by sample detecting real time video data stream, by itself and heartbeat
The permission frame loss rate of user's manual configuration is compared in signal, and according to comparative result, pattern is played out using stagnant ring mode
Conversion, jolted so as to avoid broadcasting, reached the controllable purpose of video fluency, preferably meet the work(of train operation
Can demand.
Brief description of the drawings
Fig. 1 is media play system structured flowchart.
Fig. 2 is the media renderer plays mode conversion method overview flow chart of the present invention.
The play mode that Fig. 3 is the present invention changes stagnant ring schematic diagram.
Fig. 4 is the initialization module flow chart of the present invention.
Fig. 5 is the live transcription broadcasting module flow chart of the present invention.
Fig. 6 is the recorded broadcast relay broadcasting/living broadcast block flow diagram of the present invention.
Embodiment
Describe the embodiment of the present invention in detail below in conjunction with the content of the invention and Figure of description.
(1) initialization module
As shown in figure 4, after media play system starts, media player carries out a series of communication initializations.First, initially
Change the UDP socket with broadcasting for train controller.Media player takes 9000 ports as client, passes through this port media
Player can obtain the play mode of broadcasting for train controller setting.Then, initialization and the TCP of onboard wireless receiver are socketed
Word, media player take 20410 ports as server, and the onboard wireless receiver heart is carried out by this port media player
Jump the detection of signal and the processing of emergency message demand.Then, media player opens log recording, and loading is stored in advance in
Video play lists file playlist.xml in CF cards, this document content is according to following format organization：
<Item href=＂ D:Video lubofiles Step_into_Liquid_720.wmv ＂
Md5=" 54c6e05aa9cb14f0f409fb7d151f8b59 "
Filesize=" 19593220 " startTime=＂ 08:00:00 ＂ endTime=" 09:00:00"/>
Wherein href represents the absolute path of this video file, is " D in this example:\video\lubofiles\Step_
into_Liquid_720.wmv”；Md5 represents in href the cipher mode of pointed video file, the check value in this example
For " 54c6e05aa9cb14f0f409fb7d151f8b59 "；Filesize represents video file size, is in this example
" 19593220 ", in units of Kb；StartTime and endTime represents the reproduction time section of this video file, is in this example
“08:00:00-09:00:00”.Video play lists file includes as above multiple entries, need to be to the video text in each entry
Part carries out md5 verifications.An entry in file is read, video file md5 verifications are carried out, if not by media player
It can prompt the user with " video file mistake, please upgrade in time ", and the file record of error is entered into local daily record, then system is moved back
Go out.If verification passes through, the absolute path name of the video file in this entry and reproduction time section are pressed into queue to be played
In, then judge whether all entries in video play lists file all judge to finish, if not, continuing under reading
One entry carries out md5 judgements, such as all judges to finish and all by md5 completeness checks, then media player
Broadcast window is initialized, creates and plays link, file absolute path to be played is taken out in turn from playing in queue, this path is referred to
The video file shown is loaded into broadcasting link, and recorded broadcast broadcasting is carried out using Direct Show interfaces.Then, at the beginning of media player
Beginningization real-time stream receiving thread, live configuration file Portconfig.xml is read, obtains live port numbers and live group
Address is broadcast, port numbers and multicast address are combined to obtain live url, waits live signal to reach on this url.Finally, matchmaker
Body player can judge whether the play mode that media play system is presently in is live, is such as live, then goes to live turn
Recorded broadcast module, if being not live, then go to recorded broadcast relay broadcasting/living broadcast module.
(2) play mode conversion is broadcast in live transcription
It is as shown in Figure 5 that play mode flow path switch is broadcast in live transcription.Media player first determines whether broadcasting for train controller
Can whether the play mode of setting be heartbeat signal that is automatic and receiving onboard wireless receiver.If not automatic or
Heartbeat signal can not be received, then media player changes play mode and continues to judge system currently whether to be straight into recorded broadcast and return
Broadcast pattern.Otherwise, media player starts to parse heartbeat signal, takes out the permission frame loss rate that user sets in heartbeat signal.Car
The heartbeat signal that an information type is 3, heartbeat signal data can be sent every 0.5s to media player by carrying wireless receiver
A unsigned int of the position between 0x00-0x28, its occurrence is set by hand according to demand by ground control centre, vehicle-mounted
Wireless receiver is transmitted to media player during this value is packed into heartbeat signal, media player is used as real-time video using this value
Data flow allows frame loss rate.The communications protocol format of wherein media player and onboard wireless receiver is as shown in table 1, heartbeat letter
Number implication is as shown in table 2.
Table 1
Table 2
| Byte sequence number | 0 | 1-2 | 3 | 4-7 | 8 | 9 |
| Content | 0x02 | 0x05 | 0x03 | 0x00-0x28 | 0x03 | Checksum |
After obtaining real time video data stream permission frame loss rate, whether media player detection onboard wireless receiver has promptly
Message arrives, if it has not, then starting to receive real time video data stream.If any emergency message arrive, then detect the message whether be
Type is intercutted, intercuts type in this way, then media player suspends current broadcast state immediately, takes out in message data position and carries
Urgent message contents, carry out UTF-8 transcodings and be simultaneously transferred to emergency message broadcast state.Such as the type of message does not intercut, explanation
The type of message received is revocation type, then terminates emergency message broadcast state, starts to receive real time video data stream.Real-time
In video data stream playing process, media player is within the 5s times, using 0.5s as frame losing of the cycle to real time video data stream
Rate is read out and recorded, as actual frame loss rate.Afterwards, media player proceeds by stagnant ring decision-making, by actual frame loss rate
Made comparisons with the permission frame loss rate set in previously described heartbeat signal, if having within the whole 5s times allows frame loss rate small
In actual frame loss rate, illustrate that the fluency of real time video data stream does not reach expection, media player conversion play mode is record
Broadcast and return and continue to judge whether system is currently live-mode.If in 5s, as long as once or more allowing frame loss rate
More than actual frame loss rate, it is constant and start next 5s circulation that media player is maintained for live play pattern, continues
Play mode and heartbeat signal judge.(3) recorded broadcast relay broadcasting/living broadcast play mode is changed
Recorded broadcast relay broadcasting/living broadcast play mode flow path switch is as shown in Figure 6.First, media player detection broadcasting for train controller
Can it be heartbeat signal that is automatic and receiving onboard wireless receiver that play mode whether set.If the play mode set
It is not automatic or heartbeat signal can not be received, then media player keeps recorded broadcast play mode constant and enters following for next round
Ring, continues play mode and heartbeat signal judges.Otherwise, media player parsing heartbeat signal, take out wherein user and set
Fixed permission frame loss rate.Then, whether media player detection onboard wireless receiver has emergency message arrival, if it has not, then
Start to receive real time video data stream.Arrived if any emergency message, then detect whether the message is to intercut type, intercut class in this way
Type, then media player suspend current broadcast state immediately, take out the urgent message contents carried in message data position, carry out
UTF-8 transcodings are simultaneously transferred to emergency message broadcast state.Such as the type of message does not intercut, and the type of message for illustrating to receive is revocation
Type, then terminate emergency message broadcast state, start to receive real time video data stream.In real time video data stream broadcasting process
In, media player was read out and remembered to the actual frame loss rate of real time video data stream using 0.5s as the cycle within the 5s times
Record.Afterwards, media player proceeds by stagnant ring decision-making, the permission that will be set in actual frame loss rate and previously described heartbeat signal
Frame loss rate is made comparisons, if having within the whole 5s times allows frame loss rate to be set up more than actual frame loss rate, illustrates real-time video
The fluency of data flow reaches expected, media player change play mode into it is live and return continue to judge system it is current whether
For live-mode.If in 5s, as long as once or more allowing frame loss rate to be less than actual frame loss rate, media player is just protected
It is constant and start next 5s circulation to hold recorded broadcast play mode, continues play mode and heartbeat signal judges.
Claims (1)
1. a kind of conversion method of subway train media playback mode, including initialization module, live transcription broadcasting module and recorded broadcast
Relay broadcasting/living broadcast module, it is characterised in that：
In initialization procedure, after media play system starts, media player initializes communication socket first, opens daily record
Record, broadcast window is initialized, carry out local video file md5 verifications, load and play queue, establish and play link, start record
Broadcast thread and commence play out local video, then media player can be opened and broadcasting for train controller and onboard wireless receiver
Communication thread, live configuration file is read, obtain local network interface card information and open real time video data stream receiving thread；Then,
Media player judges whether system is currently in live-mode, and enters live transcription broadcasting module or record according to judged result
Broadcast relay broadcasting/living broadcast module；
In live transcription broadcasting module, media player first determines whether the play mode of broadcasting for train controller setting is certainly
Heartbeat signal dynamic and that onboard wireless receiver can be received, if the play mode of setting is not automatic or can not received
The heartbeat signal of onboard wireless receiver, then media player directly change play mode into recorded broadcast and return continue judgement system
Whether current is live-mode；Otherwise, media player starts to parse the heartbeat signal of onboard wireless receiver, obtains user and sets
Fixed real time video data stream allows frame loss rate, detects and handles the emergency message demand of onboard wireless receiver；It is then detected that
The actual frame loss rate of real time video data stream, next, media player is according to actual frame loss rate and allows frame loss rate to be
No to meet the live judgement for transcribing condition of broadcasting, this process is changed by performing a kind of play mode based on Hysteresis control strategy
To realize；In 5s time ranges, it is all higher than allowing frame loss rate, live transcription if sampling obtained actual frame loss rate every time
Condition establishment is broadcast, media player changes play mode and continues to judge system current play mode whether to be straight into recorded broadcast and return
Broadcast；If the condition is invalid, media player keeps live play pattern constant and starts next round circulation, then judges row
Can whether the play mode of car Broadcast Controller setting be heartbeat signal that is automatic and receiving onboard wireless receiver；
In recorded broadcast relay broadcasting/living broadcast module, media player first determines whether the play mode of broadcasting for train controller setting is certainly
Heartbeat signal dynamic and that onboard wireless receiver can be received, if the play mode of setting is not automatic or can not received
Onboard wireless receiver heartbeat signal, then media player keeps recorded broadcast play mode constant, and continues play mode and sentence
Disconnected and heartbeat signal judges；Otherwise, media player starts to parse heartbeat signal, obtains the real-time stream of user's setting and allows
Frame loss rate, detect and handle the emergency message demand of onboard wireless receiver；Next, media player samples actual frame losing
Rate, by it with allowing frame loss rate to be contrasted, realize that play mode is changed by Hysteresis control strategy；In 5s time ranges,
If the actual frame loss rate sampled every time, which is respectively less than, allows frame loss rate, recorded broadcast relay broadcasting/living broadcast condition is set up, media player conversion
Play mode is live and return continues to judge whether system current play mode is live；Otherwise, media player keeps record
It is constant and start next round circulation to broadcast play mode, continues play mode and heartbeat signal and judges.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105898357A (en) * | 2015-12-22 | 2016-08-24 | 乐视网信息技术（北京）股份有限公司 | Video switching method and device |
| CN109639635B (en) * | 2018-11-05 | 2019-09-03 | 北京达佳互联信息技术有限公司 | CDN agency draws stream method, server, CDN and client |
| CN111526400B (en) * | 2020-05-06 | 2021-02-19 | 上海鸣啸信息科技股份有限公司 | Multimedia control system applied to train |
| CN115225914B (en) * | 2021-04-16 | 2023-08-22 | 浙江创意声光电科技有限公司 | Light show playing method, device, control equipment and storage medium |
| CN113810741B (en) * | 2021-10-25 | 2024-02-02 | 华动高车(无锡)科技有限公司 | Direct recording and broadcasting video mixed arranging and broadcasting control system and method |
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