CN110278047A

CN110278047A - The method, device and equipment of synchronous for clock, setting Streaming Media frame pts value

Info

Publication number: CN110278047A
Application number: CN201810218778.8A
Authority: CN
Inventors: 李正光; 熊波
Original assignee: Alibaba Group Holding Ltd
Current assignee: Alibaba Group Holding Ltd
Priority date: 2018-03-16
Filing date: 2018-03-16
Publication date: 2019-09-24

Abstract

This application discloses a kind of method and devices synchronous for clock, which comprises selection network synchronization clock source；Determine the synchronization point difference between terminal to be synchronized and network synchronization clock source；The current time of the terminal to be synchronized is calibrated according to the synchronization point difference.The application also provides a kind of for the method and apparatus of the pts value of Streaming Media frame to be arranged.The application also provides a kind of computer-readable medium and electronic equipment synchronous for clock.

Description

The method, device and equipment of synchronous for clock, setting Streaming Media frame pts value

Technical field

This application involves multi-way stream media clock field of synchronization in network, and in particular to a method of it is synchronous for clock And device.The application is related to a kind of for the method and apparatus of the pts value of Streaming Media frame to be arranged simultaneously.

Background technique

Video conference is a kind of network application, refers to that the people positioned at multiple physical spaces is carried out by communication equipment and network The meeting to talk face to face.Each participant can synchronize the sound for listening to other meeting-place by loudspeaker, can be by aobvious Show that device synchronizes the image for seeing other meeting-place participants, movement and expression, the content of electronic presentations plate can also be sended and received, Participant is set to have feeling on the spot in person.Similar network application further includes more people Lian Mai.

The audio and video of transmission over networks are transmitted in the form of audio stream and video flowing, and Streaming Media is referred to as.It is so-called Streaming Media refers to the media formats played in a network by the way of stream transmission, is called streaming video.In application, sender Streaming Media partition packetization is transmitted on network, is played Streaming Media by the timing before being packaged after recipient's decompression.If one Terminal needs while receiving multichannel Streaming Media and playing, then also needs the precedence relationship according to timing before being packaged while playing. More commonly used method is to be indicated same flow source of media packaged data playing sequence on network using Presentation Time Stamp or come from The relationship that the packaged data in different Streaming Media sources play simultaneously.

Presentation Time Stamp (Presentation Time Stamp, PTS), usually a character string uniquely identify The a certain moment is the mark of streaming media playing relationship.In with Streaming Media all the way, playing sequence is indicated, pts value is smaller, more early It plays.Meanwhile the difference of PTS represents the interval of this two frames streaming media playing between two Streaming Media frames.But synchronization is not Whether the pts value for acquiring a frame Streaming Media respectively with terminal is likely to different, identical depending on the reference clock for value.

Do you how to determine that the different two frames Streaming Media of pts value should play simultaneously? due to can not directly know not Whether the two frame Streaming Medias with terminal are collected simultaneously, so the prior art is determined by a kind of indirect mode.

Assuming that the delay difference that first Streaming Media frame that different terminals acquire respectively is transmitted to reception terminal is little, that , when according to first Streaming Media frame for receiving every road terminal transmission, receive the system time and first Streaming Media of terminal The pts value of frame, can approximate derivation Chu Ge road SS later Streaming Media frame collected simultaneously.

But due to the unstability of network, when this hypothesis is invalid, will occur playing timing error problem, and this Kind mistake can continue up down.

Summary of the invention

The application provides a kind of method synchronous for clock and a kind of for the side of the pts value of Streaming Media frame to be arranged Method, to solve the pts value difference because of the Streaming Media frame of different terminals synchronization caused by receive terminal plays timing error and ask Topic.

A kind of method synchronous for clock provided by the present application comprising:

Select network synchronization clock source；

Determine the synchronization point difference between terminal to be synchronized and network synchronization clock source；

The current time of the terminal to be synchronized is calibrated according to the synchronization point difference.

Optionally, the current time for calibrating the terminal to be synchronized according to the synchronization point difference includes:

The current of network synchronization clock source is determined with the synchronization point difference according to the terminal current time to be synchronized Calculate the moment；

Whether the communication response in the terminal to be synchronized Yu the network synchronization clock source meets setting condition, and decision is The no clock that the terminal to be synchronized is calibrated using the current reckoning moment.

Optionally, the synchronization point difference between determination terminal to be synchronized and network synchronization clock source, comprising:

Obtain A1 at the time of terminal to be synchronized sends synchronization signal to network synchronization clock source；

At the time of obtaining terminal to be synchronized and receive the response that network synchronization clock source is returned based on the synchronization signal A2；

Obtain B at the time of network synchronization clock source receives the synchronization signal；

Determine that the synchronization point between terminal to be synchronized and network synchronization clock source is poor according to described A1, A2 and moment B Value.

Optionally, described to be determined between terminal to be synchronized and network synchronization clock source according to described A1, A2 and moment B Synchronization point difference specifically:

The synchronization point between terminal to be synchronized and network synchronization clock source is obtained using the difference of the A1 and A2 mean value and B Difference D.

Optionally, B at the time of the acquisition network synchronization clock source receives the synchronization signal specifically:

The response message that parsing network synchronization clock source is returned based on the synchronization signal, passes through the result of the parsing Obtain B at the time of the network synchronization clock source receives the synchronization signal.

Optionally, described when generating Network Synchronization according to the terminal current time to be synchronized and the synchronization point difference The current reckoning moment of Zhong Yuan, comprising:

By the terminal current time to be synchronized and synchronization point difference and, acquisition network synchronization clock source it is current Calculate the moment.

Optionally, whether the communication response according to the terminal to be synchronized and the network synchronization clock source, which meets, sets Fixed condition decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment, comprising:

Whether meet setting condition according to the communication response time in the terminal to be synchronized and the network synchronization clock source, Decide whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment.

Optionally, described whether full according to the communication response time in the terminal to be synchronized and the network synchronization clock source Foot imposes a condition, and decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment；Include:

Whether met according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source and is set Fixed condition decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment.

Optionally, described according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source Whether the condition of satisfaction setting, decide whether current to calculate that the moment calibrates the clock of the terminal to be synchronized using described；Include:

It is less than described according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source When calibration condition, the clock of the terminal to be synchronized is calibrated using the current reckoning moment.

Optionally, it is described described according to communicating round-trip institute between the terminal to be synchronized and the network synchronization clock source When being less than calibration condition with the time, the clock of the terminal to be synchronized is calibrated using the current reckoning moment, comprising:

Obtain A11 at the time of terminal to be synchronized sends synchronization signal to network synchronization clock source；And obtain end to be synchronized A12 at the time of termination receives the response that network synchronization clock source is returned based on the synchronization signal；

Determine the difference T2 of the A12 and A11；

Judge whether T2 is less than to determine T2 the same manner in the difference T1 of previous acquisition；The difference T1 of the previous acquisition Meet the condition of the clock of previous calibration terminal to be synchronized；When initialization, the value of T1 is set to larger than the threshold value of setting；

If so, calibrating the clock of the terminal to be synchronized using the current reckoning moment；And

Judge whether the difference T2 is less than the threshold value of setting；

If so, stopping calibration；

If it is not, then continuing to calibrate.

Obtain C11 at the time of network synchronization clock source sends synchronization signal to terminal to be synchronized；And obtain Network Synchronization C12 at the time of clock source receives the response that terminal to be synchronized is returned based on the synchronization signal；

Determine the difference F2 of the C12 and C11；

Judge whether F2 is less than to determine F2 the same manner in the difference F1 of previous acquisition；The difference F1 of the previous acquisition Meet the condition of the clock of previous calibration terminal to be synchronized；When initialization, the value of F1 is set to larger than the threshold value of setting；

Judge whether the difference F2 is less than the threshold value of setting；

If so, stopping calibration；

If it is not, then continuing to calibrate.

Optionally, the threshold value set is 100 millisecond.

Optionally, further include, when meeting following either condition, the step of terminal forced termination clock alignment to be synchronized, Including at least with the next item down condition:

The accumulative number of communications with the network synchronization clock source of the terminal to be synchronized is more than preset number limit value；

The clock synchronization time that the terminal to be synchronized adds up is more than preset time limit value.

Optionally, the information round-trip time is identical between the terminal to be synchronized and the network synchronization clock source.

In addition, the application also provides a kind of device synchronous for clock comprising:

Selecting unit: for selecting network synchronization clock source；

Determine synchronization point difference unit: for determining the synchronization point between terminal to be synchronized and network synchronization clock source Difference；

Determine current reckoning moment unit: for according to the terminal current time to be synchronized and the synchronization point difference Determine the current reckoning moment in network synchronization clock source；

Calibration unit: it is set for whether the communication response in the terminal to be synchronized with the network synchronization clock source to meet Fixed condition decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment.

In addition, the application also provide it is a kind of for the method for the pts value of Streaming Media frame to be arranged comprising:

Streaming Media frame is acquired, the system time of terminal system when determining acquisition；

The relative calibration moment of determination is obtained according to the system time；

Set the relative calibration moment to the pts value of the Streaming Media frame；

Wherein, it is described acquisition according to the system time and the relative calibration moment of determination it is as follows:

Select network synchronization clock source；

Determine the synchronization point difference between the terminal and network synchronization clock source of the acquisition Streaming Media frame；

Network synchronization clock is determined according to the terminal current time of the acquisition Streaming Media frame and the synchronization point difference The current reckoning moment in source；

When communication response in the terminal to be synchronized Yu the network synchronization clock source meets setting condition, work as by described in The preceding reckoning moment is determined as the relative calibration moment.

Optionally, the communication response in the terminal to be synchronized Yu the network synchronization clock source, which meets, imposes a condition When, the current reckoning moment is determined as the relative calibration moment, comprising:

Met according to the communication response time in the terminal to be synchronized and the network synchronization clock source and imposed a condition, by institute It states and currently calculates that the moment is determined as the relative calibration moment.

Optionally, the communication response time according to the terminal to be synchronized and the network synchronization clock source, which meets, sets The current reckoning moment is determined as the relative calibration moment by fixed condition；Include:

Meet setting item according to the round-trip time used is communicated between the terminal to be synchronized and the network synchronization clock source The current reckoning moment is determined as the relative calibration moment by part.

Optionally,

It is described to be set according to the round-trip time satisfaction used of communication between the terminal to be synchronized and the network synchronization clock source The current reckoning moment is determined as the relative calibration moment by fixed condition；Include:

It is less than described according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source When calibration condition, the current reckoning moment is determined as the relative calibration moment.

Optionally, described according to communicating round-trip institute's used time between the terminal to be synchronized and the network synchronization clock source Between be less than calibration condition when, the current reckoning moment is determined as the relative calibration moment, comprising:

Determine the difference T2 of the A12 and A11；

If so, judging whether the difference T2 is less than the threshold value of setting；

If so, stopping calibrating and the current reckoning moment being determined as the relative calibration moment；

If it is not, then continuing to calibrate.

Optionally, it is described described according to communicating round-trip institute between the terminal to be synchronized and the network synchronization clock source When being less than calibration condition with the time, the current reckoning moment is determined as the relative calibration moment, comprising:

Determine the difference F2 of the C12 and C11；

If so, judging whether the difference F2 is less than the threshold value of setting；

If it is not, then continuing to calibrate.

Optionally, the threshold value set is 100 millisecond.

In addition, the application also provide it is a kind of for the device of the pts value of Streaming Media frame to be arranged comprising:

Acquisition unit: for acquiring Streaming Media frame, the system time of terminal system when determining acquisition；

Obtain relative calibration moment unit: for obtaining according to the system time and the relative calibration moment of determination；

PTS unit is set: for setting the relative calibration moment to the pts value of the Streaming Media frame；

Wherein, the acquisition relative calibration moment unit, comprising:

Select subelement: for selecting network synchronization clock source；

Determine synchronization point difference subelement: for determining terminal and the network synchronization clock source of the acquisition Streaming Media frame Between synchronization point difference；

It determines and current calculates moment subelement: for according to terminal current time of the acquisition Streaming Media frame and described same Step moment difference determines the current reckoning moment in network synchronization clock source；

It calibrates subelement: meeting setting for the communication response in the terminal to be synchronized Yu the network synchronization clock source When condition, the current reckoning moment is determined as the relative calibration moment.

In addition, the application also provides a kind of computer-readable medium synchronous for clock, it is stored with instruction, described instruction It can be loaded by processor and execute following steps:

Select network synchronization clock source；

In addition, the application also provides a kind of electronic equipment synchronous for clock comprising: memory and processor；

For the memory for storing computer executable instructions, the processor is executable for executing the computer Instruction:

Select network synchronization clock source；

In addition, the application also provides a kind of for the computer-readable medium of the pts value of Streaming Media frame to be arranged, store thereon There is instruction, described instruction can be loaded by processor and execute following steps:

Select network synchronization clock source；

In addition, the application also provide it is a kind of for the electronic equipment of the pts value of Streaming Media frame to be arranged comprising: memory, And processor；

Select network synchronization clock source；

Compared with prior art, the one aspect of the application have the advantage that make in network terminal to be synchronized with The same network synchronization clock source carries out clock alignment, is believed by preset condition screening for calibrating the synchronous of terminal to be synchronized Breath, makes the clock of terminal to be synchronized progressively reach required precision.

Further, achieve the purpose that all terminal clocks to be synchronized are synchronous.To be in network using sequential relationship as base The information of plinth provides reliable standard.

Detailed description of the invention

Fig. 1 is a kind of flow chart of method synchronous for clock；

Fig. 2 is a kind of sub-process figure of method synchronous for clock；

Fig. 3 is the sub-process figure of another method synchronous for clock；

Fig. 4 is a kind of unit block diagram of device synchronous for clock；

Fig. 5 is a kind of for the flow chart of the method for the pts value of Streaming Media frame to be arranged；

Fig. 6 is a kind of for the sub-process figure of the method for the pts value of Streaming Media frame to be arranged；

Fig. 7 is the sub-process figure that another is used to be arranged the method for the pts value of Streaming Media frame；

Fig. 8 is the sub-process figure that another is used to be arranged the method for the pts value of Streaming Media frame；

Fig. 9 is a kind of for the unit block diagram of the device of the pts value of Streaming Media frame to be arranged；

Figure 10 is a kind of for the subelement block diagram of the device of the pts value of Streaming Media frame to be arranged.

Specific embodiment

Many details are explained in the following description in order to fully understand the application.But the application can be with Much it is different from other way described herein to implement, those skilled in the art can be without prejudice to the application intension the case where Under do similar popularization, therefore the application is not limited by following public specific implementation.

The application provides a kind of method synchronous for clock.The application also provides a kind of for Streaming Media frame to be arranged The method of pts value.The application also provides a kind of device synchronous for clock.The application also provides a kind of for Streaming Media to be arranged The device of the pts value of frame.It is described in detail one by one in the following embodiments.

The audio and video of transmission over networks are transmitted in the form of audio stream and video flowing, and Streaming Media is referred to as.It is so-called Streaming Media refers to the media formats played in a network by the way of stream transmission, is called streaming video.In application, sender The packing of Streaming Media sectional compression is transmitted on network, is played Streaming Media by the timing before being packaged after recipient's decompression.If One terminal needs while receiving multichannel Streaming Media and playing, then also needs the precedence relationship according to timing before being packaged while broadcasting It puts.More commonly used method is to indicate same flow source of media packaged data playing sequence using Presentation Time Stamp or come on network The relationship played simultaneously from the packaged data in different Streaming Media sources.

To a kind of embodiment of the method synchronous for clock provided by the present application, including, select network synchronization clock source； Determine the synchronization point difference between terminal to be synchronized and network synchronization clock source；According to synchronization point difference calibration The current time of terminal to be synchronized.The clock information provided using consolidated network synchronous clock source of the present embodiment is standard by network The clock alignment of all terminals to be synchronized in.

The present embodiment is described in detail below with reference to Fig. 1, wherein Fig. 1 is a kind of method synchronous for clock Flow chart.

Assuming that the information round-trip time is identical between the terminal to be synchronized and the network synchronization clock source.

Step S101 selects network synchronization clock source.

The purpose of this step is relative standard of the determining network synchronization clock source as unified time in a network.Net Network synchronous clock source includes network precise synchronization clock source and network relative synchronization clock source.

Network precise synchronization clock source is mainly distributed across Network Time Protocol (Network Time all over the world Protocol, NTP) server.Server be centralized calculation can be provided for the network user under network environment, information is delivered and data The special purpose computer of the services such as management.The high-performance computer system of certain service can be provided other machines by namely referring in network System.Server requires stability, safety, performance etc. higher.The server for providing NTP service is referred to as NTP service Device.

NTP is the agreement of each computer time in synchronizing network.Can make computer be synchronized with server or when Zhong Yuan.Ntp server can provide high-precision time adjustment for different terminal devices, and the difference with the standard time can be accurate To millisecond magnitude.

Ntp server obtains universal time by atomic clock, observatory, satellite etc..

Network relative synchronization clock source is the equipment that any one in network can provide clock information, such as desktop computer, shifting Dynamic terminal, server etc..

In the application scenarios of video conference or more people Lian Mai, do not need synchronous clock source offer clock information relative to The accuracy of universal time, and require the clock information of all terminals to be synchronized same relative to consolidated network synchronous clock source Step, therefore, the present embodiment can satisfy the needs of application scenarios using network relative synchronization clock source.

The selection network synchronization clock source, be exactly in a network for the equipment of all clocks to be calibrated determine one can be with The synchronous clock source of unified time is provided.

Step S102 determines the synchronization point difference between terminal to be synchronized and network synchronization clock source.

Terminal (Terminal), also referred to as terminal device are the equipment that network outermost is in computer network, main to use In the input and the output of processing result etc. of user information.In the present embodiment, the applied fields such as video conference or more people Lian Mai All terminals of scape are referred to as terminal to be synchronized.

The terminal to be synchronized, be in network it is in need calibration clock terminal.The reference of terminal calibration to be synchronized Time is provided by network synchronization clock source.

As previously mentioned, network synchronization clock source is divided into network absolute synchronization clock source and network relative synchronization clock source, this In embodiment, answering for the application scenarios such as video conference or more people Lian Mai can satisfy using network relative synchronization clock source With.

The process that the terminal to be synchronized acquires the synchronizing information in the network synchronization clock source is as follows:

Terminal to be synchronized sends synchronization signal to network synchronization clock source, is A1 at the time of transmitted；

After network synchronization clock source receives the synchronization signal of terminal to be synchronized, return to after response message is packaged to same Terminal is walked, wherein response message includes B at the time of network synchronization clock source receives the synchronization signal；

Terminal to be synchronized receives the response message that network synchronization clock source is returned based on the synchronization signal, receives and rings It is A2 at the time of answering information；

After the response message that terminal parsing to be synchronized returns, B at the time of can get network synchronization clock source.

A1, A2 and B are referred to as the synchronizing information in network synchronization clock source.

The response message is a kind of information given a response in the form of network protocol to solicited message；Response message with The network protocol of solicited message is consistent.

For example, selecting network synchronization clock source for ntp server.In a network, when needs and ntp server synchronised clock When, terminal to be synchronized sends synchronization signal to ntp server, while recording A1 at the time of transmission sends synchronization signal；NTP service After device receives synchronization signal, B at the time of record receives synchronization signal, and the response message comprising moment B is returned to same Walk terminal；Terminal to be synchronized receives the response message that ntp server returns, and after resolution response information, obtains synchronization point B, together When, A2 at the time of record receives the response message that ntp server returns.

Terminal to be synchronized can be by carrying out above-mentioned communication with network synchronization clock source repeatedly, to obtain satisfactory net The synchronizing information of network synchronous clock source.

Synchronization point difference in the present embodiment, between determination terminal to be synchronized and network synchronization clock source, comprising:

Obtain B at the time of network synchronization clock source receives the synchronization signal；The concrete operations of terminal to be synchronized are as follows: solution The response message that analysis network synchronization clock source is returned based on the synchronization signal obtains the net by the result of the parsing B at the time of network synchronous clock source receives the synchronization signal.

It is described when determining terminal and Network Synchronization to be synchronized according to described A1, A2 and moment B according in above description Synchronization point difference between Zhong Yuan specifically:

For example, it is assumed that A1 and A2 mean value are A, i.e. mean value A=(A1+A2)/2, then synchronization point difference D=B-A.

In the present embodiment, the synchronization point difference is exactly the synchronization point value and Network Synchronization calculated under assumed condition The deviation of the actual synchronization point of clock source.

Step S103 determines network synchronization clock according to the terminal current time to be synchronized and the synchronization point difference The current reckoning moment in source.

The purpose of this step is to obtain the current reckoning moment in network synchronization clock source.

Due to the transmission time problem of network, inevitable B at the time of network synchronization clock source receives the synchronization signal Exist between A2 at the time of receiving the response that network synchronization clock source returned based on the synchronization signal with terminal to be synchronized Time difference calibrates bring large error to reduce the time difference to terminal clock to be synchronized, and the present embodiment is calculated using current It is uncertain that moment makes up large error bring.

It is described that network synchronization clock source is generated according to the terminal current time to be synchronized and the synchronization point difference It is current to calculate the moment, comprising:

For example, it is assumed that the current reckoning moment in network synchronization clock source is Y, terminal current time to be synchronized is X, then Y=X + D, error are positive and negative (A2-A1)/2.

Whether step S104, the communication response in the terminal to be synchronized Yu the network synchronization clock source meet setting item When part, decide whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment.

The purpose of this step be under setting condition, using it is described it is current calculate the moment calibrate the terminal to be synchronized when Clock.Further, terminal to be synchronized can acquire the synchronizing information in network synchronization clock source repeatedly, meet setting when communication responds When condition, the clock of terminal to be synchronized is calibrated.When using the condition of convergence, the clock of terminal to be synchronized will be constantly close to network The real clock value of synchronous clock source.

The communication response, including send communication request information and reception corresponding with communication request information response letter Breath.

It is described whether full according to the communication response in the terminal to be synchronized and the network synchronization clock source in the present embodiment Foot imposes a condition, and decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment, comprising:

Further, comprising:

In the present embodiment, the above method can be realized from multiple angles, for example, initiating synchronous calibration behaviour by terminal to be synchronized Make, as shown in Fig. 2, specific step is as follows, comprising:

Step S104-1-1 obtains A11 at the time of terminal to be synchronized sends synchronization signal to network synchronization clock source；And Obtain A12 at the time of terminal to be synchronized receives the response that network synchronization clock source is returned based on the synchronization signal；

Step S104-1-2 determines the difference T2 of the A12 and A11；

Step S104-1-3, judges whether T2 is less than to determine T2 the same manner in the difference T1 of previous acquisition；Before described The difference T1 of secondary acquisition meets the condition of the clock of previous calibration terminal to be synchronized；When initialization, the value of T1 is set to larger than The threshold value of setting；

Step S104-1-4, if so, calibrating the clock of the terminal to be synchronized using the current reckoning moment；

Step S104-1-5, judges whether the difference T2 is less than the threshold value of setting；

Step S104-1-6, if so, stopping calibration；

Step S104-1-7, if it is not, then continuing to calibrate.

Above-mentioned specific implementation step is to initiate synchronous calibration by terminal to be synchronized to operate, and is sent to network synchronization clock source same Step request, obtain network synchronization clock source synchronizing information A11, A12 after, by this obtain A12 and A11 difference T2 with The difference T1 that synchronizing information A1, A2 in network synchronization clock source is obtained when the clock of previous calibration terminal to be synchronized compares, if T2 meets the condition of convergence compared with T1, then the clock of the terminal to be synchronized is calibrated using the current reckoning moment.

Convergence, is a several scientific name word, is an important tool of Study Function, refers to and converge at a bit, to a certain value It is close.

The condition of convergence is exactly constantly to the close condition that must possess of a certain value.

The purpose of the present embodiment is exactly the requirement for making clock alignment constantly reach clock accuracy.

Since when terminal to be synchronized for the first time sends synchronization request to network synchronization clock source, the actual value of T1 is not deposited In order to keep the continuity of program, the condition of the initialization of T1 has also been devised in the present embodiment: the value of T1, which is set to larger than, to be set Fixed threshold value.

Threshold means boundary, therefore threshold value is called critical value, refers to minimum or peak that an effect can generate.

The threshold value of the setting is the precision for measuring clock alignment, when clock is calibrated to the threshold value less than setting, Indicate that clock has reached defined precision, clock alignment is completed.

For example, it is assumed that this calibration clock when obtain terminal to be synchronized to network synchronization clock source send synchronization signal when A11 is carved, at the time of obtaining terminal to be synchronized and receive the response that network synchronization clock source is returned based on the synchronization signal A12, the difference of A12 and A11 is T2 when this calibrates clock, then T2=A12-A11；Assuming that obtaining when previous calibration clock to same A1 at the time of terminal sends synchronization signal to network synchronization clock source is walked, terminal to be synchronized is obtained and receives network synchronization clock source The A2 at the time of response returned based on the synchronization signal, the difference of A2 and A1 is T1 when previous calibration clock, then T1=A2- A1.It is described to judge whether T2 is less than to determine T2 the same manner in the difference T1 of previous acquisition, that is, judges whether T2 < T1 is true, As immediately, then the clock of the terminal to be synchronized is calibrated using the current reckoning moment.Most importantly in calibration clock After make T1=T2, so as to can be calibrated on the basis of new next time, make calibration constantly close to required precision, reach accordingly Calibrate the convergent purpose of terminal clock to be synchronized.

Another angle is initiated synchronous calibration by network synchronization clock source and is operated, as shown in figure 3, specific step is as follows, packet It includes:

Step S104-2-1 obtains C11 at the time of network synchronization clock source sends synchronization signal to terminal to be synchronized；And Obtain C12 at the time of network synchronization clock source receives the response that terminal to be synchronized is returned based on the synchronization signal；

Step S104-2-2 determines the difference F2 of the C12 and C11；

Step S104-2-3, judges whether F2 is less than to determine F2 the same manner in the difference F1 of previous acquisition；Before described The difference F1 of secondary acquisition meets the condition of the clock of previous calibration terminal to be synchronized；When initialization, the value of F1 is set to larger than The threshold value of setting；

Step S104-2-4, if so, calibrating the clock of the terminal to be synchronized using the current reckoning moment；

Step S104-2-5, judges whether the difference F2 is less than the threshold value of setting；

Step S104-2-6, if so, stopping calibration；

Step S104-2-7, if it is not, then continuing to calibrate.

Above-mentioned specific implementation step is only different in the main body for initiating simultaneously operating, is implementing upper and upper one implementation The difference of step is simultaneously little, is not repeated herein.

The optimal threshold value of setting described in above-mentioned specific implementation step is 100 milliseconds.

Complicated network environment may make the request receiving time difference of terminal to be synchronized be unable to satisfy setting condition always, For the time overlength for avoiding clock synchronous, the wasting of resources of terminal to be synchronized is caused, the present embodiment has also been devised described to be synchronized The step of terminal forced termination clock alignment, includes at least with the next item down condition:

The accumulative number of communications with the network synchronization clock source of the terminal to be synchronized is more than preset number limit value.

The present embodiment makes terminal to be synchronized all in network and the same network synchronization clock source carry out clock alignment, leads to It crosses preset condition and constantly screens synchronizing information for calibrating terminal to be synchronized, the clock of terminal to be synchronized is made to progressively reach precision It is required that further, achieving the purpose that all terminal clocks to be synchronized are synchronous.To in network based on sequential relationship Information provides reliable standard.

Corresponding with the first method synchronous for clock provided by the present application, it is synchronous that the application also provides a kind of clock Device.Since Installation practice is substantially similar to embodiment of the method, so describing fairly simple, relevant part is referred to The corresponding explanation of embodiment of the method.Installation practice described below is only schematical.

Fig. 4 shows a kind of embodiment of device synchronous for clock provided by the present application.Fig. 4 is a kind of for clock The unit block diagram of synchronous device.

Referring to FIG. 4, the application provides a kind of device synchronous for clock, comprising: selecting unit 401 is determined and synchronized Moment difference unit 402 determines current reckoning moment unit 403, calibration unit 404.

Selecting unit 401: for selecting network synchronization clock source；

Determine synchronization point difference unit 402: synchronous between terminal to be synchronized and network synchronization clock source for determining Moment difference；

Determine current reckoning moment unit 403: for according to the terminal current time to be synchronized and the synchronization point Difference determines the current reckoning moment in network synchronization clock source；

Calibration unit 404: whether full for the communication response in the terminal to be synchronized Yu the network synchronization clock source Foot imposes a condition, and decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment.

Based on the embodiment of the first method synchronous for clock provided by the present application, present invention also provides one Plant the embodiment for the method for the pts value of Streaming Media frame to be arranged.Due to the present embodiment with it is above-mentioned the first for clock it is same Based on the embodiment of the method for step, so describing fairly simple, the correspondence that relevant part refers to embodiment of the method is said It is bright.

Fig. 5 shows provided by the present application a kind of for the embodiment of the method for the pts value of Streaming Media frame to be arranged.Fig. 5 is It is a kind of for being arranged the flow chart of the method for the pts value of Streaming Media frame, Fig. 6 is a kind of for the pts value of Streaming Media frame to be arranged The sub-process figure of method.

Fig. 5 and Fig. 6 are please referred to, it is provided by the present application a kind of for the method for the pts value of Streaming Media frame to be arranged, comprising:

Step S501 acquires Streaming Media frame, the system time of terminal system when determining acquisition.

Step S502 obtains according to the system time relative calibration moment of determination.

Step S503 sets the relative calibration moment to the pts value of the Streaming Media frame.

Referring to FIG. 6, wherein, step S502, acquisition relative calibration moment of determination according to the system time It is as follows:

Step S502-1 selects network synchronization clock source.

Step S502-2 determines that the synchronization point between the terminal and network synchronization clock source of the acquisition Streaming Media frame is poor Value.

Wherein, it is described determined according to described A1, A2 and moment B it is same between terminal to be synchronized and network synchronization clock source Moment difference is walked, specifically:

B at the time of the acquisition network synchronization clock source receives the synchronization signal, specifically:

Step S502-3 determines net according to the terminal current time of the acquisition Streaming Media frame and the synchronization point difference The current reckoning moment of network synchronous clock source.

Include:

Step S502-4, the communication response in the terminal to be synchronized Yu the network synchronization clock source, which meets, to impose a condition When, the current reckoning moment is determined as the relative calibration moment.

In the present embodiment, comprising:

Further, comprising:

In the present embodiment, the above method can be realized from multiple angles, for example, initiating synchronous calibration behaviour by terminal to be synchronized Make, as shown in fig. 7, specific step is as follows, comprising:

S502-4-1-1 obtains A11 at the time of terminal to be synchronized sends synchronization signal to network synchronization clock source；And it obtains A12 at the time of taking terminal to be synchronized to receive the response that network synchronization clock source is returned based on the synchronization signal；

S502-4-1-2 determines the difference T2 of the A12 and A11；

S502-4-1-3, judges whether T2 is less than to determine T2 the same manner in the difference T1 of previous acquisition；It is described previous The difference T1 of acquisition meets the condition of the clock of previous calibration terminal to be synchronized；When initialization, the value of T1, which is set to larger than, to be set Fixed threshold value；

S502-4-1-4, if so, judging whether the difference T2 is less than the threshold value of setting；

S502-4-1-5, if so, stopping calibrating and the current reckoning moment being determined as the relative calibration moment；

S502-4-1-6, if it is not, then continuing to calibrate.

Another angle is initiated synchronous calibration by network synchronization clock source and is operated, as shown in figure 8, specific step is as follows, packet It includes:

S502-4-2-1 obtains C11 at the time of network synchronization clock source sends synchronization signal to terminal to be synchronized；And it obtains C12 at the time of taking network synchronization clock source to receive the response that terminal to be synchronized is returned based on the synchronization signal；

S502-4-2-2 determines the difference F2 of the C12 and C11；

S502-4-2-3, judges whether F2 is less than to determine F2 the same manner in the difference F1 of previous acquisition；It is described previous The difference F1 of acquisition meets the condition of the clock of previous calibration terminal to be synchronized；When initialization, the value of F1, which is set to larger than, to be set Fixed threshold value；

S502-4-2-4, if so, judging whether the difference F2 is less than the threshold value of setting；

S502-4-2-5, if so, stopping calibrating and the current reckoning moment being determined as the relative calibration moment；

S502-4-2-6, if it is not, then continuing to calibrate.

The present embodiment makes the pts value and the same network synchronization clock of the Streaming Media frame of terminal to be synchronized all in network Source carries out clock alignment, and the synchronizing information for calibrating terminal to be synchronized is constantly screened by preset condition, thus, make different ends The pts value of the Streaming Media frame at end reaches unified required precision, to ensure that the Streaming Media frame synchronization of different terminals is orderly broadcast It puts.

When acquiring the not calibrated terminal clock of terminal of Streaming Media frame described in above embodiments, when obtaining the relative calibration It carves, the pts value of the Streaming Media frame is set using the relative calibration moment.Certainly, also may include in other embodiments Following steps: the terminal of the acquisition Streaming Media frame calibrates clock using the relative calibration moment.The acquisition Streaming Media frame Terminal calibration clock after, system time when terminal acquisition Streaming Media frame as the relative calibration moment, without again with Network synchronization clock source carries out clock synchronous working.

The similar above application, those skilled in the art can make corresponding change, the application couple according to the actual situation This is with no restrictions.But any technical solution for the method for the pts value of setting Streaming Media frame involved in the application includes Within the scope of protection of this application.

Corresponding with the application method of pts value for Streaming Media frame to be arranged provided above, the application also provides one Plant the device for the pts value of Streaming Media frame to be arranged.Since Installation practice is substantially similar to embodiment of the method, so describing Fairly simple, relevant part refers to the corresponding explanation of embodiment of the method.Installation practice described below is only Schematically.

Fig. 9 shows provided by the present application a kind of for the embodiment of the device of the pts value of Streaming Media frame to be arranged.Fig. 9 is It is a kind of for the unit block diagram of the device of the pts value of Streaming Media frame to be arranged；Figure 10 is a kind of for the pts value of Streaming Media frame to be arranged Device subelement block diagram.

Referring to FIG. 9, the application provide it is a kind of for the device of the pts value of Streaming Media frame to be arranged, comprising: acquisition unit 601, relative calibration moment unit 602 is obtained, PTS unit 603 is set.Acquisition unit 601: it for acquiring Streaming Media frame, determines The system time of terminal system when acquisition；

Obtain relative calibration moment unit 602: for obtaining according to the system time and the relative calibration moment of determination；

PTS unit 603 is set: for setting the relative calibration moment to the pts value of the Streaming Media frame；

Referring to FIG. 10, wherein, the acquisition relative calibration moment unit 602, comprising: selection subelement 602-1 is determined Synchronization point difference subelement 602-2 determines current reckoning moment subelement 602-3, calibrates subelement 602-4.

Select subelement 602-1: for selecting network synchronization clock source；

Determine synchronization point difference subelement 602-2: for determining the terminal and Network Synchronization of the acquisition Streaming Media frame Synchronization point difference between clock source；

Determine and current calculate moment subelement 602-3: for according to terminal current time of the acquisition Streaming Media frame with The synchronization point difference determines the current reckoning moment in network synchronization clock source；

Calibrate subelement 602-4: full for the communication response in the terminal to be synchronized Yu the network synchronization clock source When foot imposes a condition, the current reckoning moment is determined as the relative calibration moment.

A kind of computer-readable medium embodiment provided by the present application is as follows:

This application provides a kind of computer-readable mediums synchronous for clock.

The computer-readable medium embodiment synchronous for clock provided by the present application describes fairly simple, related Part refer to above-mentioned offer the embodiment of the method synchronous for clock corresponding explanation.Reality described below It is only schematical to apply example.

The application provides a kind of computer-readable medium synchronous for clock, is stored with instruction, and described instruction can be by Processor loads and executes following steps:

Select network synchronization clock source；

A kind of electronic equipment embodiment provided by the present application is as follows:

This application provides a kind of electronic equipments synchronous for clock.

The electronic equipment embodiment synchronous for clock provided by the present application describes fairly simple, relevant part The corresponding explanation of the embodiment of the method synchronous for clock of above-mentioned offer is provided.Embodiment described below is only It is only illustrative.

The application provides a kind of electronic equipment synchronous for clock, comprising: memory and processor；

Select network synchronization clock source；

This application provides a kind of for the computer-readable medium of the pts value of Streaming Media frame to be arranged.

The computer-readable medium embodiment of the pts value for Streaming Media frame to be arranged provided by the present application describes to obtain ratio Relatively simple, relevant part refers to the described for pair of the embodiment of the method for the pts value of Streaming Media frame to be arranged of above-mentioned offer It should illustrate.Embodiment described below is only schematical.

The application provides a kind of for the computer-readable medium of the pts value of Streaming Media frame to be arranged, and is stored with instruction, described Instruction can be loaded by processor and execute following steps:

Select network synchronization clock source；

This application provides a kind of for the electronic equipment of the pts value of Streaming Media frame to be arranged.

The electronic equipment embodiment of the pts value for Streaming Media frame to be arranged provided by the present application describes simpler Single, the correspondence for the embodiment of the method for the pts value of Streaming Media frame to be arranged that relevant part refers to above-mentioned offer is said It is bright.Embodiment described below is only schematical.

The application provides a kind of for the electronic equipment of the pts value of Streaming Media frame to be arranged, comprising: memory, and processing Device；

Select network synchronization clock source；

Although the application is disclosed as above with preferred embodiment, it is not for limiting the application, any this field skill Art personnel are not departing from spirit and scope, can make possible variation and modification, therefore the guarantor of the application Shield range should be subject to the range that the claim of this application defined.

In a typical configuration, calculating equipment includes one or more processors (CPU), input/output interface, net Network interface and memory.

Memory may include the non-volatile memory in computer-readable medium, random access memory (RAM) and/or The forms such as Nonvolatile memory, such as read-only memory (ROM) or flash memory (flash RAM).Memory is computer-readable medium Example.

1, computer-readable medium can be by any side including permanent and non-permanent, removable and non-removable media Method or technology realize that information stores.Information can be computer readable instructions, data structure, the module of program or other numbers According to.The example of the storage medium of computer includes, but are not limited to phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other kinds of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory techniques, CD-ROM are read-only Memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, tape magnetic disk storage or Other magnetic storage devices or any other non-transmission medium, can be used for storage can be accessed by a computing device information.According to Herein defines, and computer-readable medium does not include non-temporary computer readable media (transitory media), such as modulates Data-signal and carrier wave.

2, it will be understood by those skilled in the art that embodiments herein can provide as the production of method, system or computer program Product.Therefore, complete hardware embodiment, complete software embodiment or embodiment combining software and hardware aspects can be used in the application Form.It can be used moreover, the application can be used in the computer that one or more wherein includes computer usable program code The computer program product implemented on storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) Form.

Claims

1. a kind of method synchronous for clock characterized by comprising

Select network synchronization clock source；

2. the method synchronous for clock according to claim 1, which is characterized in that described poor according to the synchronization point The current time of terminal to be synchronized described in value calibration includes:

The current reckoning in network synchronization clock source is determined according to the terminal current time to be synchronized and the synchronization point difference Moment；

Whether the communication response in the terminal to be synchronized Yu the network synchronization clock source meets setting condition, decides whether to adopt The clock of the terminal to be synchronized is calibrated with the current reckoning moment.

3. the method synchronous for clock according to claim 2, which is characterized in that determination terminal to be synchronized and net Synchronization point difference between network synchronous clock source, comprising:

Obtain A2 at the time of terminal to be synchronized receives the response that network synchronization clock source is returned based on the synchronization signal；

The synchronization point difference between terminal to be synchronized and network synchronization clock source is determined according to described A1, A2 and moment B.

4. the method synchronous for clock according to claim 3, it is characterised in that:

It is described to determine that the synchronization point between terminal to be synchronized and network synchronization clock source is poor according to described A1, A2 and moment B Value specifically:

The synchronization point difference between terminal to be synchronized and network synchronization clock source is obtained using the difference of the A1 and A2 mean value and B D。

5. the method synchronous for clock according to claim 3, which is characterized in that the acquisition network synchronization clock source B at the time of receiving the synchronization signal specifically:

The response message that parsing network synchronization clock source is returned based on the synchronization signal is obtained by the result of the parsing B at the time of the network synchronization clock source receives the synchronization signal.

6. the method synchronous for clock according to claim 2, which is characterized in that described according to the terminal to be synchronized Current time and the synchronization point difference generate the current reckoning moment in network synchronization clock source, comprising:

By the terminal current time to be synchronized and synchronization point difference and, the current reckoning in acquisition network synchronization clock source Moment.

7. the method synchronous for clock according to claim 2, which is characterized in that described according to the terminal to be synchronized Whether meet setting condition with the communication response in the network synchronization clock source, decides whether using the current reckoning moment school The clock of the quasi- terminal to be synchronized, comprising:

Whether meet setting condition according to the communication response time in the terminal to be synchronized and the network synchronization clock source, determines Whether the clock of the to be synchronized terminal is calibrated using the current reckoning moment.

8. the method synchronous for clock according to claim 7, which is characterized in that described according to the terminal to be synchronized Whether meet setting condition with the communication response time in the network synchronization clock source, when deciding whether using the current reckoning Carve the clock for calibrating the terminal to be synchronized；Include:

Whether meet setting according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source Condition decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment.

9. the method synchronous for clock according to claim 8, it is characterised in that:

It is described whether to meet and set according to communicating the round-trip used time between the terminal to be synchronized and the network synchronization clock source Fixed condition decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment；Include:

Calibration is less than according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source described When condition, the clock of the terminal to be synchronized is calibrated using the current reckoning moment.

10. the method synchronous for clock according to claim 9, which is characterized in that

It is described to be less than described according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source When calibration condition, the clock of the terminal to be synchronized is calibrated using the current reckoning moment, comprising:

Obtain A11 at the time of terminal to be synchronized sends synchronization signal to network synchronization clock source；And it obtains terminal to be synchronized and connects A12 at the time of receiving the response that network synchronization clock source is returned based on the synchronization signal；

Determine the difference T2 of the A12 and A11；

Judge whether T2 is less than to determine T2 the same manner in the difference T1 of previous acquisition；The difference T1 of the previous acquisition meets The condition of the clock of previous calibration terminal to be synchronized；When initialization, the value of T1 is set to larger than the threshold value of setting；

Judge whether the difference T2 is less than the threshold value of setting；

If so, stopping calibration；

If it is not, then continuing to calibrate.

11. the method synchronous for clock according to claim 9, which is characterized in that it is described described according to When communicating the round-trip used time between synchronous terminal and the network synchronization clock source and being less than calibration condition, using described when being pushed forward The calculation moment calibrates the clock of the terminal to be synchronized, comprising:

Obtain C11 at the time of network synchronization clock source sends synchronization signal to terminal to be synchronized；And obtain network synchronization clock C12 at the time of source receives the response that terminal to be synchronized is returned based on the synchronization signal；

Determine the difference F2 of the C12 and C11；

Judge whether F2 is less than to determine F2 the same manner in the difference F1 of previous acquisition；The difference F1 of the previous acquisition meets The condition of the clock of previous calibration terminal to be synchronized；When initialization, the value of F1 is set to larger than the threshold value of setting；

Judge whether the difference F2 is less than the threshold value of setting；

If so, stopping calibration；

If it is not, then continuing to calibrate.

12. 0 or 11 described in any item methods synchronous for clock according to claim 1, which is characterized in that the setting Threshold value is 100 milliseconds.

13. according to the described in any item methods synchronous for clock of claim 2 to 11, which is characterized in that further include, full When the following either condition of foot, the step of terminal forced termination clock alignment to be synchronized, include at least with the next item down condition:

14. according to the described in any item methods synchronous for clock of claim 2 to 11, which is characterized in that described to be synchronized The information round-trip time is identical between terminal and the network synchronization clock source.

15. a kind of device synchronous for clock characterized by comprising

Selecting unit: for selecting network synchronization clock source；

Determine synchronization point difference unit: for determining that the synchronization point between terminal to be synchronized and network synchronization clock source is poor Value；

Determine current reckoning moment unit: for determining according to the terminal current time to be synchronized and the synchronization point difference The current reckoning moment in network synchronization clock source；

Calibration unit: whether meet setting item for the communication response in the terminal to be synchronized Yu the network synchronization clock source Part decides whether the clock that the terminal to be synchronized is calibrated using the current reckoning moment.

16. a kind of for the method for the pts value of Streaming Media frame to be arranged characterized by comprising

Select network synchronization clock source；

Network synchronization clock source is determined according to the terminal current time of the acquisition Streaming Media frame and the synchronization point difference It is current to calculate the moment；

When communication response in the terminal to be synchronized Yu the network synchronization clock source meets setting condition, it ought be pushed forward described The calculation moment is determined as the relative calibration moment.

17. according to claim 16 for the method for the pts value of Streaming Media frame to be arranged, which is characterized in that the determination Synchronization point difference between terminal to be synchronized and network synchronization clock source, comprising:

18. according to claim 17 for the method for the pts value of Streaming Media frame to be arranged, it is characterised in that:

19. according to claim 17 for the method for the pts value of Streaming Media frame to be arranged, spy is, the acquisition net B at the time of network synchronous clock source receives the synchronization signal specifically:

20. according to claim 16 for the method for the pts value of Streaming Media frame to be arranged, which is characterized in that the basis The terminal current time to be synchronized and the synchronization point difference generate the current reckoning moment in network synchronization clock source, packet It includes:

21. according to claim 16 for the method for the pts value of Streaming Media frame to be arranged, which is characterized in that described in institute It is when stating communication response satisfaction setting condition of the terminal to be synchronized with the network synchronization clock source, the current reckoning moment is true It is set to the relative calibration moment, comprising:

Met according to the communication response time in the terminal to be synchronized and the network synchronization clock source and imposed a condition, worked as by described in The preceding reckoning moment is determined as the relative calibration moment.

22. according to claim 21 for the method for the pts value of Streaming Media frame to be arranged, which is characterized in that the basis The communication response time in the terminal to be synchronized and the network synchronization clock source, which meets, to impose a condition, when by the current reckoning It is determined as the relative calibration moment quarter；Include:

Meet setting condition according to the round-trip time used is communicated between the terminal to be synchronized and the network synchronization clock source, it will The current reckoning moment is determined as the relative calibration moment.

23. according to claim 22 for the method for the pts value of Streaming Media frame to be arranged, it is characterised in that:

It is described that setting item is met according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source The current reckoning moment is determined as the relative calibration moment by part；Include:

Calibration is less than according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source described When condition, the current reckoning moment is determined as the relative calibration moment.

24. according to claim 23 for the method for the pts value of Streaming Media frame to be arranged, which is characterized in that

Calibration is less than according to the round-trip time used of communication between the terminal to be synchronized and the network synchronization clock source described When condition, the current reckoning moment is determined as the relative calibration moment, comprising:

Determine the difference T2 of the A12 and A11；

If it is not, then continuing to calibrate.

25. according to claim 23 for the method for the pts value of Streaming Media frame to be arranged, which is characterized in that described in institute It, will when stating according to the round-trip time used is communicated between the terminal to be synchronized and the network synchronization clock source less than calibration condition The current reckoning moment is determined as the relative calibration moment, comprising:

Determine the difference F2 of the C12 and C11；

If it is not, then continuing to calibrate.

26. described in any item for the method for the pts value of Streaming Media frame to be arranged according to claim 24 or 25, feature exists In the threshold value set is 100 millisecond.

27. 6 to 25 is described in any item for the method for the pts value of Streaming Media frame to be arranged according to claim 1, feature exists In further including, when meeting following either condition, the step of terminal forced termination clock alignment to be synchronized, including at least following One condition:

28. 6 to 25 is described in any item for the method for the pts value of Streaming Media frame to be arranged according to claim 1, feature exists In the information round-trip time is identical between the terminal to be synchronized and the network synchronization clock source.

29. a kind of for the device of the pts value of Streaming Media frame to be arranged characterized by comprising

Wherein, the acquisition relative calibration moment unit, comprising:

Select subelement: for selecting network synchronization clock source；

Determine synchronization point difference subelement: between the terminal and network synchronization clock source for determining the acquisition Streaming Media frame Synchronization point difference；

Determine and current calculate moment subelement: for according to terminal current time of the acquisition Streaming Media frame with it is described synchronous when Carve the current reckoning moment that difference determines network synchronization clock source；

It calibrates subelement: meeting for the communication response in the terminal to be synchronized Yu the network synchronization clock source and impose a condition When, the current reckoning moment is determined as the relative calibration moment.

30. a kind of computer-readable medium synchronous for clock, which is characterized in that be stored thereon with instruction, described instruction energy It is enough to be loaded by processor and execute following steps:

Select network synchronization clock source；

31. a kind of electronic equipment synchronous for clock characterized by comprising memory and processor；

The memory is for storing computer executable instructions, and for executing, the computer is executable to be referred to the processor It enables:

Select network synchronization clock source；

32. a kind of for the computer-readable medium of the pts value of Streaming Media frame to be arranged, which is characterized in that it is stored thereon with instruction, Described instruction can be loaded by processor and execute following steps:

Select network synchronization clock source；

33. a kind of for the electronic equipment of the pts value of Streaming Media frame to be arranged characterized by comprising memory, and processing Device；

Select network synchronization clock source；