CN101316161A - Synchronous indication method and system for distributed video - Google Patents
Synchronous indication method and system for distributed video Download PDFInfo
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Abstract
The invention discloses a distributed video synchronous display method and system, the method includes the following steps: a service terminal is connected with a first client terminal according to the access request of the first client terminal, and a multicast address is transmitted to the first client terminal; the service terminal sets up data connection with a second client terminal according to the access request of the second client terminal, and the multicast address is transmitted to the second client terminal; then the service terminal changes the synchronous mark and transmits the synchronous mark information and video data to the second client terminal and the first client terminal in the way of multicast; the first client terminal and the second client terminal discard the video data previously sent by the service terminal according to the synchronous mark information and acquire and display new video data. For the distributed video display method and system provided by the invention, the first client terminal and the second client terminal can synchronously receive the video data transmitted by the service terminal and can synchronously display the video data at the first client terminal and the second client terminal.
Description
Technical field
The present invention relates to technical field of computer multimedia, relate in particular to a kind of distributed video synchronous display method and system.
Background technology
The distributed video demonstration is that the video data of service end sends to the demonstration that distributes on many clients, and every client is responsible for showing the part of intact video images.
In the prior art, the video data that service end will show sends to a plurality of clients, and general service end is to adopt the data communication protocol of multicast to send video datas to a plurality of clients, and the client receiving video data also shows in client.But when the video data of service end transmission arrives client, if have new client to add to come in this moment, inconsistent on the video data time of occurrence that then new client and former client receive, cause new client and former client can not receive the video data that service end sends synchronously, new client and before client on also just can not show the video data of service end transmission synchronously.
Summary of the invention
The invention provides a kind of distributed video synchronous display method and system, its first client and second client can receive the video data that service end sends over synchronously, can show the video data that service end sends synchronously in first client and second client.
Technical scheme of the present invention is: a kind of distributed video synchronous display method comprises step:
The connection request that S101, service end send according to first client is set up data with described first client and is connected, and multicast address is sent to first client;
S102, described first client receive described multicast address and begin to receive the video data that described service end sends on described multicast address;
The connection request that S103, described service end send according to second client is set up data with described second client and is connected, and then described multicast address is sent to described second client; Described second client receives described multicast address and receive the video data that described service end sends on described multicast address;
S104, described service end change synchronous mark, and described synchronous mark information and video data are sent to first client and second client in the multicast mode;
When S105, described first client and second client receive described synchronous mark information, detecting this synchronous mark information changes, then first client and second client are discarded in respectively and detect the described synchronous mark information video data that described service end sends before changing, and receive the new video data that described service end sends again;
S106, described first client and second client show according to the new video data that the described service end that receives sends.
The present invention has also disclosed a kind of distributed video synchronous display system, and it comprises,
Service end, first client and second client; Service end is connected with second client data with first client respectively;
Described service end comprises data link block and multicast module;
The data link block, the connection request that successively sends according to first client and second client is set up data with first client with second client and is connected respectively; And successively send multicast address to first client and second client;
The multicast module after second client sends described multicast address, changes synchronous mark in described data link block, and synchronous mark information and video data is sent to described first client and second client in the multicast mode; ,
Described second client comprises that second sending/receiving module, second detects the processing module and second display module;
Second sending/receiving module sends connection request to described service end, sets up data with described service end and is connected; Receive the multicast address that described service end sends, beginning is at receiving video data on described multicast address; Receive video data and synchronous mark information that described service end sends in the multicast mode;
Second detects processing module, detect be discarded in after described synchronous mark information changes detect described synchronous mark information change before the video data that sends of described service end, receive the new video data that described service end sends again;
Second display module, the new video data that receives according to the described second detection processing module shows;
Described first client comprises that first sending/receiving module, first detects the processing module and first display module;
First sending/receiving module sends connection request to described service end, is connected with described service end data; Receive the multicast address that described service end sends, on this multicast address, receive the video data that described service end sends;
First detects processing module, detect be discarded in when described synchronous mark information that described service end sends changes detect described synchronous mark information change before the video data that sends of described service end, receive the new video data that described service end sends again;
First display module, the new video data that receives according to the first detection processing module shows.
Distributed video synchronous display method of the present invention, first client is successively set up data with service end with second client and is connected, first client and second client detect be discarded in after synchronous mark information that service end sends changes detect synchronous mark information change before the video data that sends of service end, first client and second client receive the new video data that service end sends by the multicast mode again simultaneously, guaranteed that first client and second client can receive the video data that service end sends over synchronously, thereby also just can guarantee to show the video data that described service end sends synchronously in first client and first client.After avoiding appearing at first client and service end and setting up data and be connected, if when having second client and service end to set up data to be connected, the inconsistent situation of video data that the service end that first client and second client receive sends.
Description of drawings
Fig. 1 is the flow chart of distributed video synchronous display method embodiment one of the present invention;
Fig. 2 is the flow chart of distributed video synchronous display method embodiment two of the present invention;
Fig. 3 is the structured flowchart of distributed video synchronous display system one embodiment of the present invention;
Fig. 4 is the structured flowchart of distributed video synchronous display system one embodiment of the present invention;
Fig. 5 is the structured flowchart of distributed video synchronous display system one embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done a detailed elaboration.
The video data that distributed video synchronous display method of the present invention is a service end sends to distribute on many clients and shows that every client is responsible for showing the part of intact video images.
Be that example describes with two clients in the following example.
Embodiment one
Distributed video synchronous display method of the present invention comprises step, as shown in Figure 1,
S101, service end allocation of multicast addresses, and send video data to multicast address, the connection request that sends according to first client of service end is set up data with described first client and is connected then, and described multicast address is sent to first client;
S102, first client receive described multicast address, and begin to receive the video data that service end sends on described multicast address.
The connection request that S103, service end send according to second client is set up data with described second client and is connected, and then described multicast address is sent to described second client.
S104, second client receive described multicast address, and also begin to receive the video data that service end sends on described multicast address.
S105, described service end change synchronous mark, and described synchronous mark information and video data are sent to first client and second client in the multicast mode.
Synchronous mark can be an integer that can change, and in one embodiment, synchronous mark can be 32 integers, constantly adds up since 0, and when service end did not change synchronous mark, this integer can not change; When service end changed synchronous mark, this integer added 1, and whether client can detect this synchronous mark and change.In one embodiment, synchronous mark information can be the head at video data, and convenient first client and second client detect.Multicast is a kind of tcp/ip communication agreement, principle is that service end sends a video data, a plurality of clients that are connected with service end can be received simultaneously with a video data, in actual applications, described service end can be set up data with first client with second client respectively by switch and is connected.
When S106, first client and second client receive synchronous mark information, detecting this synchronous mark information changes, then first client and second client are discarded in and detect the video data that service end that synchronous mark information received before changing sends, and receive the new video data that service end sends again.So just can guarantee that first client and second client receive the video data that service end sends simultaneously, and then can guarantee that first client and second client can show described video data synchronously.
S107, described first client and second client show according to receiving new video data.
In step S104, after second client receives multicast address, can also comprise step, second client sends response message to service end; Among the step S105, service end receives this response message, and changes synchronous mark according to this response message.Second client is when being ready to receive the video data of service end transmission, send response message to service end, can guarantee that like this second client receives the video data that service end sends, when preventing second client and also not being ready to receive data, service end just sends video data to second client.
In order further to improve synchronous display effect between first client and second client, receive the response message of second client transmission in service end after, can also comprise step, service end is provided with fiducial time, and with fiducial time information send to first client and second client respectively.The service end current time can be added that 200ms is as fiducial time in one embodiment.
Step S107 is specifically as follows: first client and second client are that unit shows with the frame according to the video data that receives, the demonstration time of every two field picture is determined by the sequencing of fiducial time and frame rate and every two field picture, in one embodiment, can calculate the demonstration time of two field picture by following computational methods:
Two field picture shows time=fiducial time+(1000ms/ frame rate) * frame number
Frame number is exactly the sequencing of every two field picture, and be exactly the current time of service end fiducial time, and such first client and second client showed according to the demonstration time of every two field picture, can improve the synchronous effect that image shows.
In order to reach identical purpose, step S107 can be that unit shows with the frame according to the video data that receives for: first client and second client also specifically, the demonstration time of every two field picture is determined by the relative time that fiducial time and every two field picture show, in one embodiment, can calculate the demonstration time of two field picture by following computational methods:
Two field picture shows time=fiducial time+(relative time of the relative time of present frame-first frame)
The relative time that two field picture shows is exactly the time that every two field picture showed with respect to fiducial time, and the relative time of the demonstration of every two field picture can be brought in definite by service, can comprise this information in the video data that service end sends.
After the demonstration time of determining good every two field picture, can also comprise step: described first client and second client are according to the described two field picture of demonstration time buffer memory of every two field picture.This step is in first client and the second customer end adopted frame buffered, it is asynchronous to prevent that network congestion from causing, in one embodiment, two field picture can be preserved into a formation, new frame is inserted into rear of queue, head taking-up two field picture from formation during demonstration shows, adopts the method can make things convenient for the display frame image.In one embodiment, the frame buffer formation can be calculated by 25 frames/second by demonstration time buffer memory 5 two field pictures of every two field picture, is about the cache-time of 200ms.
After the demonstration time of determining good every two field picture, in time show when the demonstration time arrives in order better to control every two field picture, in one embodiment, whether be respectively arranged with the demonstration time that real-time detection thread goes to detect every two field picture in first client and second client arrives, the poll current time that this thread does not stop, if the demonstration time that detects a two field picture wherein then, first client and second client just show this two field picture, every two field picture is carried out buffer memory queuing handle if first client and second client show the time frame by frame, then whether this thread demonstration time that only need detect the two field picture of buffer queue head arrives.In another embodiment, whether the demonstration time that first client and second client can also go to detect every two field picture according to the frequency of RTC (universal timepiece equipment) clock respectively arrives, if detecting wherein, a two field picture shows the time then, first client and second client just show this two field picture, every two field picture is carried out buffer memory queuing handle if first client and second client show the time frame by frame, then whether first client and second client demonstration time that only need detect the two field picture of buffer queue head arrives.
In order to make the time synchronized of the service end and first client and second client, service end is with after second client is set up data and is connected, can also comprise step, service end is respectively to first client and the second client transmitting time information on services, service end can be certain frequency to first client and the second client transmitting time information on services, first client and second client respectively according to the time of time information on services and service end carry out to the time.In one embodiment, can open NTP (NetworkTime Procotol, the NTP (Network Time Protocol)) time in service end and serve, first client and second client can by NTP and service end carry out to the time.
Embodiment two
As shown in Figure 2, this embodiment is with the difference of above-mentioned enforcement one: it is different that service end sends the video data starting point, and in embodiment one, service end is before first client and service end are set up data and be connected, just distribute multicast address, and on this multicast address, send video data.In this embodiment, step S101 is, the connection request that service end sends according to first client is set up data with described first client and is connected, allocation of multicast addresses, and to multicast address transmission video data; Be only step S102 then, service end sends to first client with described multicast address.Promptly among this embodiment, service end is after first client and service end are set up data and be connected, the multicast address of having reallocated, and on this multicast address, send video data, just send this multicast address afterwards to first client.All the other steps are identical with embodiment one, do not give unnecessary details at this.
Embodiment three
The present invention has also disclosed the system that a kind of distributed video shows synchronously, as shown in Figure 3, and service end, first client and second client; Service end is connected with second client data with first client respectively; In actual applications, described service end can be connected with second client data with first client respectively by data communications equipment, and as shown in Figure 4, described data communications equipment can be hub, router or switch.
Wherein, described service end comprises data link block and multicast module;
The data link block, the connection request that successively sends according to first client and second client is set up data with first client with second client and is connected respectively; And successively send multicast address to first client and second client;
The multicast module after second client sends described multicast address, changes synchronous mark in described data link block, and synchronous mark information and video data is sent to described first client and second client in the multicast mode;
Described second client comprises that second sending/receiving module, second detects the processing module and second display module;
Second sending/receiving module sends connection request to described service end, sets up data with described service end and is connected; Receive the multicast address that described service end sends, beginning is at receiving video data on described multicast address; Receive video data and synchronous mark information that described service end sends in the multicast mode;
Second detects processing module, detect be discarded in after described synchronous mark information changes detect described synchronous mark information change before the video data that sends of described service end, receive the new video data that described service end sends again;
Second display module, the new video data that receives according to the described second detection processing module shows;
Described first client comprises that first sending/receiving module, first detects the processing module and first display module;
First sending/receiving module sends connection request to described service end, is connected with described service end data; Receive the multicast address that described service end sends, on this multicast address, receive the video data that described service end sends;
First detects processing module, detect be discarded in when described synchronous mark information that described service end sends changes detect described synchronous mark information change before the video data that sends of described service end, receive the new video data that described service end sends again;
First display module, the new video data that receives according to the first detection processing module shows.
Notify described service end when enough being ready to receive the video data that service end sends in described second client, described second client also comprises responder module, as shown in Figure 4, behind the described multicast address that receives described service end transmission, send response message to described service end; Change described synchronous mark behind the response message of the multicast module of described service end according to described second client transmission.Can guarantee that so described second client can receive the video data that service end sends, when preventing second client and being not ready for receiving video data, service end is just to second client transmission video data.Can in first client responder module be set, but in actual applications, service end does not change synchronous mark after receiving the response message that first client sent yet.
In order to guarantee that first client and second client can better show the video data that service end sends synchronously, described service end also comprises module fiducial time, as shown in Figure 4, be used to receive described response message, and after receiving described response message, be set fiducial time, and with described fiducial time information send to described first client and second client, in one embodiment, the service end current time can be added that 200ms is as fiducial time.Described first display module and second display module are used to receive described fiducial time of information, and the new video data that will receive shows that frame by frame the demonstration time of every two field picture is determined by the sequencing of described fiducial time and frame rate and every two field picture or determined by the relative time that described fiducial time and every two field picture show.Can guarantee first client and the synchronous display video data of second client energy on the demonstration time like this.
In order to prevent that network congestion occurring in first client and second client causes showing nonsynchronous situation, described first client also comprises first cache module, second client also comprises second cache module, as shown in Figure 4, respectively according to the described two field picture of demonstration time buffer memory of every two field picture of determining.In one embodiment, two field picture can be preserved into a formation, new two field picture is inserted into rear of queue, and the head taking-up two field picture from formation during demonstration shows, adopts the method can make things convenient for the display frame image.In one embodiment, the frame buffer formation can be calculated by 25 frames/second by demonstration time buffer memory 5 two field pictures of every two field picture, is about the cache-time of 200ms.
For demonstration time of every two field picture then, first client and second client can in time go to show, described first client also includes first and detects a thread module or a RTC clock module in real time, as shown in Figure 4 and Figure 5, described first detect the demonstration time that the thread module is used to detect every two field picture in real time; When the demonstration time that detects a two field picture wherein then, notify described first display module to show this two field picture; A described RTC clock module is used for going to detect according to the RTC clock frequency demonstration time of described two field picture; A two field picture shows the time then when detecting wherein, notifies described first display module to show this two field picture; Described second client branch also includes second and detects thread module or the 2nd RTC module in real time, and described first detects the demonstration time that the thread module is used to detect every two field picture in real time; When the demonstration time that detects a two field picture wherein then, notify described second display module to show this two field picture; Described the 2nd RTC clock module is used for going to detect according to the RTC clock frequency demonstration time of described two field picture; A two field picture shows the time then when detecting wherein, notifies described second display module to show this two field picture.
Described service end also includes the time service module, as shown in Figure 4, is used for to described first client and the second client transmitting time information on services; Described first client also includes very first time module, and described second client also includes second time module, be respectively applied for to receive described time information on services, and according to described time information on services and described service end to the time.The time that can guarantee first client and second client and service end like this is consistent, and has further guaranteed first client and second client effect of display video data synchronously.
Above example only is to be that example describes with two clients, and client can be many in actual applications.When increasing a client newly, newly-increased client sends connection request to service end; Service end is set up data according to this linking request with newly-increased client and is connected, and multicast address is sent to newly-increased client; This client just can be from receiving video data on this multicast address; Newly-increased then client sends response message to service end, and service end changes synchronous mark according to this response message, and this synchronous mark is sent to all clients; When all clients receive synchronous mark information, detecting this synchronous mark information changes, then all clients are discarded in and detect the video data that is received before this synchronous mark information change, and receive the new video data that service end sends again.So just can guarantee that all clients receive the new video data that service end sends simultaneously, and then can guarantee that all clients can show described new video data synchronously.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (12)
1, a kind of distributed video synchronous display method is characterized in that, comprises step:
The connection request that S101, service end send according to first client is set up data with described first client and is connected, and multicast address is sent to first client;
S102, described first client receive described multicast address and begin to receive the video data that described service end sends on described multicast address;
The connection request that S103, described service end send according to second client is set up data with described second client and is connected, and then described multicast address is sent to described second client; Described second client receives described multicast address and receive the video data that described service end sends on described multicast address;
S104, described service end change synchronous mark, and described synchronous mark information and video data are sent to first client and second client in the multicast mode;
When S105, described first client and second client receive described synchronous mark information, detecting this synchronous mark information changes, then first client and second client are discarded in respectively and detect the described synchronous mark information video data that described service end sends before changing, and receive the new video data that described service end sends again;
S106, described first client and second client show according to the new video data that the described service end that receives sends.
2, distributed video synchronous display method according to claim 1 is characterized in that: among the step S103, described second client sends response message to described service end after receiving described multicast address;
Among the step S104, described service end receives described response message and changes synchronous mark according to described response message.
3, distributed video synchronous display method according to claim 2, it is characterized in that: after described service end receives described response message, also comprise step, described service end is provided with fiducial time, and should fiducial time information send to first client and second client;
Step S106 is specially: described first client and second client show described new video data frame by frame, and the demonstration time of every two field picture is determined by the sequencing of described fiducial time and frame rate and every two field picture or determined by the relative time that described fiducial time and every two field picture show.
4, distributed video synchronous display method according to claim 3, it is characterized in that: after the demonstration time of determining every two field picture, also comprise step, described first client and second client are according to the described two field picture of demonstration time buffer memory of every two field picture.
5, distributed video synchronous display method according to claim 3 is characterized in that: after the demonstration time of determining every two field picture, also comprise following one of them step:
A. described first client and second client are provided with the demonstration time that real-time detection thread removes to detect two field picture; A two field picture shows the time then when detecting wherein, and described first client and second client show this two field picture;
B. described first client and second client go to detect the demonstration time of two field picture according to the RTC clock frequency; A two field picture shows the time then when detecting wherein, and described first client and second client show this two field picture.
6, according to the described distributed video synchronous display method of the arbitrary claim of claim 1 to 5, it is characterized in that: set up after data are connected in described service end and described second client, also comprise step, described service end is to described first client and the described second client transmitting time information on services, described first client, second client according to described time information on services and described service end carry out to the time.
7, a kind of distributed video synchronous display system is characterized in that, comprising: service end, first client and second client; Service end is connected with second client data with first client respectively;
Described service end comprises data link block and multicast module;
The data link block, the connection request that successively sends according to first client and second client is set up data with first client with second client and is connected respectively; And successively send multicast address to first client and second client;
The multicast module after second client sends described multicast address, changes synchronous mark in described data link block, and synchronous mark information and video data is sent to described first client and second client in the multicast mode; ,
Described second client comprises that second sending/receiving module, second detects the processing module and second display module;
Second sending/receiving module sends connection request to described service end, sets up data with described service end and is connected; Receive the multicast address that described service end sends, beginning is at receiving video data on described multicast address; Receive video data and synchronous mark information that described service end sends in the multicast mode;
Second detects processing module, detect be discarded in after described synchronous mark information changes detect described synchronous mark information change before the video data that sends of described service end, receive the new video data that described service end sends again;
Second display module, the new video data that receives according to the described second detection processing module shows;
Described first client comprises that first sending/receiving module, first detects the processing module and first display module;
First sending/receiving module sends connection request to described service end, is connected with described service end data; Receive the multicast address that described service end sends, on this multicast address, receive the video data that described service end sends;
First detects processing module, detect be discarded in when described synchronous mark information that described service end sends changes detect described synchronous mark information change before the video data that sends of described service end, receive the new video data that described service end sends again;
First display module, the new video data that receives according to the first detection processing module shows.
8, distributed video synchronous display system according to claim 7 is characterized in that: described second client also comprises responder module, sends response message to described service end behind the described multicast address that receives described service end transmission;
Described multicast module changes described synchronous mark according to the response message that described second client sends.
9, distributed video synchronous display system according to claim 8, it is characterized in that: described service end also comprises module fiducial time, be used to receive described response message, and after receiving described response message, be set fiducial time, and with described fiducial time information send to described first client and second client;
Described first display module and second display module are used to receive described fiducial time of information, and the new video data that will receive shows that frame by frame the demonstration time of every two field picture is determined by the sequencing of described fiducial time and frame rate and every two field picture or determined by the relative time that described fiducial time and every two field picture show.
10, distributed video synchronous display system according to claim 9, it is characterized in that: described first client also comprises first cache module, second client also comprises second cache module, respectively according to the described two field picture of demonstration time buffer memory of every two field picture of determining.
11, distributed video synchronous display system according to claim 9, it is characterized in that: described first client also includes first and detects a thread module or a RTC clock module in real time, and described first detects the demonstration time that the thread module is used to detect every two field picture in real time; When the demonstration time that detects a two field picture wherein then, notify described first display module to show this two field picture; A described RTC clock module is used for going to detect according to the RTC clock frequency demonstration time of described two field picture; A two field picture shows the time then when detecting wherein, notifies described first display module to show this two field picture;
Described second client branch also includes second and detects thread module or the 2nd RTC module in real time, and described first detects the demonstration time that the thread module is used to detect every two field picture in real time; When the demonstration time that detects a two field picture wherein then, notify described second display module to show this two field picture; Described the 2nd RTC clock module is used for going to detect according to the RTC clock frequency demonstration time of described two field picture; A two field picture shows the time then when detecting wherein, notifies described second display module to show this two field picture.
12, according to the described distributed video synchronous display system of the arbitrary claim of claim 7 to 11, it is characterized in that: described service end also includes the time service module, is used for to described first client and the second client transmitting time information on services;
Described first client also includes very first time module, and described second client also includes second time module, be respectively applied for to receive described time information on services, and according to described time information on services and described service end to the time.
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| CN102143376A (en) * | 2010-11-29 | 2011-08-03 | 北大方正集团有限公司 | Method and device for detecting consistency of twin-channel video signals |
| CN102143376B (en) * | 2010-11-29 | 2013-05-22 | 北大方正集团有限公司 | Method and device for detecting consistency of twin-channel video signals |
| WO2014101510A1 (en) * | 2012-12-25 | 2014-07-03 | 腾讯科技（深圳）有限公司 | Data synchronization processing method and system |
| US9525733B2 (en) | 2012-12-25 | 2016-12-20 | Tencent Technology (Shenzhen) Company Limited | Method and system for data synchronization |
| CN104993901A (en) * | 2015-07-09 | 2015-10-21 | 广东威创视讯科技股份有限公司 | Data synchronization method and device of distributed system |
| CN104993901B (en) * | 2015-07-09 | 2017-08-29 | 广东威创视讯科技股份有限公司 | Distributed system method of data synchronization and device |
| CN106487864A (en) * | 2015-09-02 | 2017-03-08 | 华为终端（东莞）有限公司 | The method for building up of data cube computation, service end and mobile terminal |
| CN106487864B (en) * | 2015-09-02 | 2019-09-27 | 华为终端有限公司 | Method for building up, server-side and the mobile terminal of data connection |
| US10693967B2 (en) | 2015-09-02 | 2020-06-23 | Huawei Technologies Co., Ltd. | Data connection establishment method, server, and mobile terminal |
| CN114390007A (en) * | 2021-12-23 | 2022-04-22 | 西安诺瓦星云科技股份有限公司 | Data processing method, device, storage medium and processor |
| CN114390007B (en) * | 2021-12-23 | 2024-03-15 | 西安诺瓦星云科技股份有限公司 | Data processing method, device, storage medium and processor |
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