CN104378677B - A kind of car-mounted terminal video method for handover control - Google Patents
A kind of car-mounted terminal video method for handover control Download PDFInfo
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- CN104378677B CN104378677B CN201410661089.6A CN201410661089A CN104378677B CN 104378677 B CN104378677 B CN 104378677B CN 201410661089 A CN201410661089 A CN 201410661089A CN 104378677 B CN104378677 B CN 104378677B
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Classifications
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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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
- H04N21/4325—Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
-
- 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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
-
- 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
- H04N21/64784—Data processing by the network
- H04N21/64792—Controlling the complexity of the content stream, e.g. by dropping packets
Abstract
The invention discloses a kind of car-mounted terminal video method for handover control, comprise the following steps：（1）, buffer unit receive the video data that direct broadcast server sends, and be stored in buffering area；（2）, calculate in buffering area the packet loss of data to be sent in current instantaneous time section and from current time in the continuous N seconds time period data to be sent packet loss, and send to playback equipment result of calculation, and simultaneously to the data in the current instantaneous time section of playback equipment transmission；（3）, the playback equipment judge whether the packet loss of data to be sent in current instantaneous time section meets live requirement；（4）, the playback equipment judge whether the packet loss of the data to be sent in the continuous N seconds time period from current time meets live requirement.Car-mounted terminal video method for handover control of the invention, it is ensured that video smoothing switching in the case of ad hoc network, and avoid the frequent switching problem under severe network environment.
Description
Technical field
It is to be related to a kind of car-mounted terminal video switching control side specifically the invention belongs to video display arts field
Method.
Background technology
In track traffic or urban mass-transit system, audio/video player system is the service system that all kinds of information are provided for passenger
System.One of major function of audio/video player system is to play all kinds of video frequency programs, and video frequency program includes the local video for recording
With two kinds of the live video obtained in real time by direct broadcast server, the local video for recording pre-saves AT STATION or vehicle-mounted broadcasts
In putting equipment；Station live video is sent to station playback equipment by direct broadcast server in real time by cable transmission network, vehicle-mounted straight
Broadcasting video needs to be sent on vehicle mounted playing apparatus in real time by direct broadcast server by wireless network.
The problem of wireless network communication quality causes part live data to occur mistake in transmitting procedure or lose,
Vehicle mounted playing apparatus cannot be timely sent to, mosaic occur so as to cause video, influence Consumer's Experience, for this reason, it may be necessary to
Increase a kind of buffer unit on vehicle mounted playing apparatus, the live data that will be received is cached, detect the packet lost
And retransmitted to server request, after buffering after a while, quality live data higher is sent to broadcasting by buffer unit
Equipment.In the case of network packet loss rate stabilization, now because the data for playing the data of consumption and receive just reach balance, and
Playing standard can be reached.As shown in figure 1, being ideally buffer data situation schematic diagram, dash area meets live
It is required that data, blank parts represent and are unsatisfactory for the data of live requirement, in this case, are unsatisfactory for the data of live requirement
And it is continuous to meet the data of live requirement, temporarily switching is needed to broadcast when there are being unsatisfactory for the data of live requirement
Local video is put to avoid live mosaic phenomenon, and once just switching video during with the data for meeting broadcast request
To live, but, the vehicles in actual moving process, due to various interference and wiring problem, actual conditions such as Fig. 2 institutes
Show, even in buffering area, the data for meeting broadcast request and being unsatisfactory for broadcast request are alternately present.According to prior art
If buffered play method, it will cause playback equipment frequent switching between live video and the local video of recording, seriously
Influence viewing effect, and then cause user actually two kinds of videos of form cannot be watched.
The content of the invention
The present invention in order to solve existing car-mounted terminal live video in order to avoid mosaic phenomenon, by live video and recorded broadcast
Video frequent switching causes the bad technical problem of viewing effect, it is proposed that a kind of car-mounted terminal video method for handover control, can
To solve the problems, such as frequent switching, viewing effect is good.
In order to solve the above-mentioned technical problem, the present invention is achieved using following technical scheme：
A kind of car-mounted terminal video method for handover control, comprises the following steps：
（1）, buffer unit receive the video data that direct broadcast server sends, and be stored in buffering area；
（2）, buffer unit start and after buffer time T, periodically calculate in buffering area and treated in current instantaneous time section
Send data packet loss and from current time in the continuous N second time period data to be sent packet loss, and by calculate knot
Fruit is sent to playback equipment, and simultaneously to the data in the current instantaneous time section of playback equipment transmission, during the buffering
Between T be more than M, the M be current data packet loss it is constant in the case of so that buffering area send and receive data keep balance
Most short buffer time；
（3）, the playback equipment receives data in the result of calculation and current instantaneous time section, and judges current
Whether the packet loss of data to be sent meets live requirement in instantaneous time section, if so, then entering step（4）, otherwise, play record
Broadcast video；
（4）, the playback equipment judge the data to be sent in the continuous N seconds time period from current time packet loss whether
Live requirement is met, if so, then playing live video.
Further, in the step（1）In, the buffer unit detects whether received data has packet simultaneously
Lose, if there is data-bag lost, repeat requests are sent to direct broadcast server, and the benefit bag data that direct broadcast server is retransmitted
It is stored in buffering area.
Further, in the step（2）In, the computational methods of the most short buffer time M are：
Wherein, d is current data packet loss, and t is the cycle that application is retransmitted, and D is datum target packet loss.
Preferably, the buffer time T is bigger N seconds than the most short buffer time M, and the N is not less than 10.
Further, the step（3）In also include detect currently playing video type the step of, be currently played
During live video, if the packet loss of data to be sent is to meet live requirement in current instantaneous time section, continue to play live
Video, if the packet loss of data to be sent is unsatisfactory for live requirement in current instantaneous time section, recorded broadcast video is played in switching；
When recorded broadcast video is currently played, if the packet loss of data to be sent is to meet live in current instantaneous time section
It is required that, then perform step（4）If the packet loss of data to be sent is unsatisfactory for live requirement in current instantaneous time section, continues
Play recorded broadcast video.
Further, the step（4）In, when recorded broadcast video is currently played, if the playback equipment judges certainly
The packet loss of data to be sent meets live requirement in the continuous N seconds time period from current time, then switch to broadcasting live video,
Otherwise, continue to play recorded broadcast video.
Preferably, the step（2）In periodically calculate in buffering area data to be sent in current instantaneous time section
Packet loss, data to be sent are treat in current buffer to be sent to playback equipment 200 milliseconds in the current instantaneous time section
Data in~300 milliseconds of time periods.
Compared with prior art, advantages and positive effects of the present invention are：Car-mounted terminal video switching control of the invention
Method, is buffered live video by setting buffer unit in the buffer, and instantaneously to be sent according to packet loss comprehensive descision
The quality of data and the continuous N seconds time period quality of data to be sent, only when the quality of data in described two time periods while full
Foot is live when requiring, just recorded broadcast is switched to it is live, and then when ensure that live current video quality and it is continuous N seconds in the future when
Between video quality in section, it is to avoid if run into cause when live data quality data are alternately present it is live with recorded broadcast frequent switching
Problem, result of broadcast is good.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Plus it is clear.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is buffering area schematic diagram in the case of preferable packet loss in background technology；
Fig. 2 is buffering area schematic diagram in the case of actual packet loss in background technology；
Fig. 3 is car-mounted terminal a kind of embodiment flow chart of video method for handover control proposed by the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
In track traffic or urban mass-transit system, because vehicle-ground wireless communication network is quickly moved by the vehicles,
And vehicles surrounding environment（Such as tunnel）Influence, cause part live data occur in transmitting procedure mistake or lose
Lose, it is impossible to be timely sent to the playback equipment of car-mounted terminal, mosaic phenomenon occur so as to cause live video, even
Impact mitigation measure is employed, due to the severe applied environment of the vehicles, the data in actual conditions in buffering area are still present suitable
Close played data and be not suitable for the situation that played data is alternately present, therefore the live data played is intermittent, if
In order to solve mosaic phenomenon, broadcast is switched over and recorded broadcast between by by live in car-mounted terminal, namely be adapted to play
Play live when live, recorded broadcast played when being not suitable for playing live, live and recorded broadcast frequent switching phenomenon will accordingly occurs,
Causing passenger cannot watch two kinds of videos, and the present invention is in order to solve the above problems, it is proposed that a kind of car-mounted terminal video is cut
Change control method, by setting buffering area, and according to the instantaneous quality of data to be sent of packet loss comprehensive descision and it is continuous N seconds when
Between the section quality of data to be sent, only when in described two time periods the quality of data simultaneously meet live requirement when, just by recorded broadcast
Switch to live, and then current video quality and the video quality in the continuous N seconds time period in the future when ensure that live, it is to avoid
Cause when live data quality data are alternately present live with problem of recorded broadcast frequent switching if running into, result of broadcast is good.It is logical
Cross and buffer time T is set more than most short buffer time M, it is ensured that if actual packet loss is more than theoretical packet loss, buffering dress
Sufficient buffer time is equipped with, and buffer unit has the instantaneous quality of data to be sent of Time Calculation and continuous N seconds time period
The quality of data to be sent.To be described in detail with a specific embodiment below.
Embodiment one, the present embodiment proposes a kind of car-mounted terminal video method for handover control, as shown in figure 3, including with
Lower step：
S1, buffer unit receive the video data that direct broadcast server sends, and are stored in buffering area；
S2, buffer unit start and after buffer time T, periodically calculate pending in current instantaneous time section in buffering area
Send data packet loss and from current time in the continuous N seconds time period data to be sent packet loss, and by result of calculation
Send to playback equipment, and simultaneously to the data in the current instantaneous time section of playback equipment transmission, the buffer time T
More than M, the M be current data packet loss it is constant in the case of so that buffering area send and receive data keep balance most
Short buffer time；
S3, the playback equipment receive the data in the result of calculation and current instantaneous time section, and judge current
Whether the packet loss of data to be sent meets live requirement in instantaneous time section, if so, then entering step S4, otherwise, plays record
Broadcast video；
S4, the playback equipment judge the data to be sent in the continuous N seconds time period from current time packet loss whether
Live requirement is met, if so, then playing live video.
In urban traffic service system, one of which is the service system that all kinds of information are provided for passenger.The master of system
It is to play all kinds of video frequency programs to want one of function.Terminal in urban transportation is vehicle-mounted on the mobile vehicles including being arranged at
Terminal and the station terminal for being arranged at station, station terminal is not due to moving, therefore network communication quality is relative to vehicle-mounted
Preferably, the car-mounted terminal video method for handover control of the present embodiment is poor especially for car-mounted terminal etc network environment for terminal
Video playback is controlled, and certainly, is also applied for the video switching control of station terminal.
In the car-mounted terminal video method for handover control of the present embodiment, video frequency program is divided into the local video that records and logical
Cross two kinds of the live video that direct broadcast server is obtained in real time：The local video for recording is pre-stored in station terminal or vehicle-mounted end
In the playback equipment at end；Station terminal live video is sent to station broadcasting by direct broadcast server and set in real time by cable transmission network
Standby, vehicle-mounted live video needs to be sent to the playback equipment of car-mounted terminal in real time by direct broadcast server by wireless network
On.In order to tentatively solve because network transmission problems cause part live data to occur wrong or loss asking in transmitting procedure
Topic, by setting buffer unit in the present embodiment, receives the video data that direct broadcast server sends, and deposit by buffer unit first
Enter buffering area；Started by step S2, buffer unit and after buffer time T, when periodically calculating current instantaneous in buffering area
Between in section the packet loss of data to be sent and from current time in the continuous N seconds time period data to be sent packet loss,
I.e. packet loss reflects the quality of data in the time period, and result of calculation is sent to playback equipment, and simultaneously to described
Playback equipment sends the data in current instantaneous time section, with reference to step S3 and step S4, only when in described two time periods
When the quality of data meets live requirement simultaneously, just recorded broadcast is switched to it is live, and then when ensure that live current video quality with
And the video quality in the continuous N second time period in the future, it is to avoid cause directly if running into when live data quality data are alternately present
The problem with recorded broadcast frequent switching is broadcast, result of broadcast is good.It is more than M by the way that buffer time T is set, the M loses for current data
In the case that bag rate is constant so that buffering area sends and receives the most short buffer time that data keep balance, it is ensured that if actual
When packet loss is more than theoretical packet loss, buffer unit has sufficient buffer time, and the data is activation amount being unlikely in buffering area is big
It is uneven caused by reception amount, and buffer unit have the instantaneous quality of data to be sent of Time Calculation and it is continuous N seconds when
Between the section quality of data to be sent.
Used as a preferred embodiment, in the step S1 of the present embodiment, the buffer unit detects institute simultaneously
Whether the data of reception have data-bag lost, if there is data-bag lost, repeat requests are sent to direct broadcast server, and will be straight
The benefit bag data for broadcasting server re-transmission is stored in buffering area.This step takes full advantage of buffer time of the data in buffering area,
In data buffering process, lost data packets are found in time, and ask direct broadcast server to resend, maximized reduction packet loss
Rate, improves the quality of data.
In order to ensure play quality, the buffer length of buffer unit have to be larger than certain numerical value, when enough to have
Between detect and apply for reissuing the data of loss.In the step S2, the computational methods of the most short buffer time M are：
Wherein, d is current data packet loss, and t is the cycle that application is retransmitted, and D is datum target packet loss.Buffer unit is opened
The data of buffering area original position reach broadcast request after dynamic M seconds.Ideally, now because playing the data and reception that consume
Data just reach balance, and playing standard can be reached.
In order under preventing actual conditions, actual packet loss is more than preferable packet loss, causes the calculated continuous N seconds time period to be treated
Send data packetloss rate larger, and ultimately result in calculated continuous N seconds time period data packetloss rate to be sent and be always unable to reach
The live standard of setting, cannot switch to live video from recorded broadcast video for a long time, and this is contrary to live preferential principle, therefore,
The buffer time T is bigger N seconds than the most short buffer time M, and the N is not less than 10.Continuous N so can be ensured with maximized
The second time period quality of data to be sent, can switch to live video by video from recorded broadcast video in time, but, N values also can not
With infinity, so cause the buffer time long live effect of influence.
Also include the step of detecting currently playing video type in the present embodiment step S3 described further, currently broadcast
When putting live video, if the packet loss of data to be sent is to meet live requirement in current instantaneous time section, continue to play straight
Video is broadcast, if the packet loss of data to be sent is unsatisfactory for live requirement in current instantaneous time section, recorded broadcast video is played in switching,
Mosaic phenomenon can be avoided.
When recorded broadcast video is currently played, if the packet loss of data to be sent is to meet live in current instantaneous time section
It is required that, then step S4 is performed, if the packet loss of data to be sent is unsatisfactory for live requirement in current instantaneous time section, continue to broadcast
Put recorded broadcast video, it is to avoid the problem of the frequent switching of content is played under the conditions of ad hoc network.
In the step S4, when recorded broadcast video is currently played, if the playback equipment judges to connect from current time
The packet loss for continuing data to be sent in N seconds time period meets live requirement, then switch to broadcasting live video, otherwise, continues to broadcast
Put recorded broadcast video.Video playback when solving the problems, such as still to be unsatisfactory for broadcast request using buffer unit rear video quality, Yi Jiji
Video smoothing switching problem under the network condition of end.
Preferably, losing for data to be sent in current instantaneous time section is periodically calculated in buffering area in the step S2
Bag rate, in the current instantaneous time section data to be sent be treat in current buffer to send to playback equipment 200 milliseconds~
Data in 300 milliseconds of time periods.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
Change, remodeling, addition or replacement that the those of ordinary skill in domain is made in essential scope of the invention, should also belong to this hair
Bright protection domain.
Claims (6)
1. a kind of car-mounted terminal video method for handover control, it is characterised in that comprise the following steps：
(1), buffer unit receives the video data that direct broadcast server sends, and is stored in buffering area；
(2), buffer unit starts and after buffer time T, periodically calculates to be sent in current instantaneous time section in buffering area
The packet loss of data and from current time in the continuous N seconds time period data to be sent packet loss, and result of calculation is sent out
Playback equipment is delivered to, and simultaneously to the data in the current instantaneous time section of playback equipment transmission, the buffer time T is big
In M, the M be current data packet loss it is constant in the case of so that buffering area send and receive data keep balance it is most short
Buffer time；
(3), the playback equipment receives the data in the result of calculation and current instantaneous time section, and judges current instantaneous
Whether the packet loss of data to be sent meets live requirement in time period, if so, then entering step (4), otherwise, plays recorded broadcast and regards
Frequently；
(4), the playback equipment judges whether the packet loss of the data to be sent in the continuous N seconds time period from current time meets
Live requirement, if so, then playing live video；
Also include the step of detecting currently playing video type in the step (3), when live video is currently played, if working as
The packet loss of data to be sent is to meet live requirement in preceding instantaneous time section, then continue to play live video, if current instantaneous
The packet loss of data to be sent is unsatisfactory for live requirement in time period, then recorded broadcast video is played in switching；
When recorded broadcast video is currently played, if the packet loss of data to be sent is to meet live wanting in current instantaneous time section
Ask, then perform step (4), if the packet loss of data to be sent is unsatisfactory for live requirement in current instantaneous time section, continue to broadcast
Put recorded broadcast video.
2. car-mounted terminal video method for handover control according to claim 1, it is characterised in that in the step (1),
The buffer unit detects whether received data has data-bag lost simultaneously, if there is data-bag lost, to direct broadcast service
Device sends repeat requests, and the benefit bag data that direct broadcast server is retransmitted is stored in buffering area.
3. car-mounted terminal video method for handover control according to claim 2, it is characterised in that in the step (2),
The computational methods of the most short buffer time M are：
Wherein, d is current data packet loss, and t is the cycle that application is retransmitted, and D is datum target packet loss.
4. car-mounted terminal video method for handover control according to claim 3, it is characterised in that the buffer time T ratios
The most short buffer time M is big N seconds, and the N is not less than 10.
5. car-mounted terminal video method for handover control according to claim 1, it is characterised in that in the step (4), when
It is preceding when playing recorded broadcast video, if the playback equipment judges from current time data to be sent in the continuous N seconds time period
Packet loss meet live requirement, then switch to broadcasting live video, otherwise, continue play recorded broadcast video.
6. the car-mounted terminal video method for handover control according to claim any one of 1-4, it is characterised in that the step
(2) packet loss of data to be sent in current instantaneous time section in buffering area, the current instantaneous time are periodically calculated in
Section in data to be sent be current buffer in treat to playback equipment send 200 milliseconds~300 milliseconds time periods in data.
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| CN104717535B (en) * | 2015-03-11 | 2018-01-16 | 大连理工大学 | A kind of conversion method of subway train media playback mode |
| 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 |
| 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 |
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