CN104702876A - Multichannel synchronous playback method and multichannel synchronous playback device - Google Patents
Multichannel synchronous playback method and multichannel synchronous playback device Download PDFInfo
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Abstract
The invention discloses a multichannel synchronous playback method and a multichannel synchronous playback device. The multichannel synchronous playback method includes determining a playback time period and M channels in need of multichannel synchronous playback, wherein the M is a positive integer larger than 1; aiming at each channel, searching out video files corresponding to the playback time period from corresponding video files of the channel; determining channels which serve as main channels in different sub-periods within the playback time period respectively according to start time and end time of the searched video files, wherein the channel which serves as the main channel in each sub-period has video files needing playback; according to determining results, performing multichannel synchronous playback by means of dynamically switching the main channels according to the different sub-periods. By the aid of the multichannel synchronous playback method and the multichannel synchronous playback device, video file searching efficiency and the like can be improved.
Description
Technical field
The present invention relates to field of video monitoring, particularly a kind of Multi-path synchronous back method and device.
Background technology
Existing digital hard disc video recorder (DVR, Digital Video Recorder) etc. all possesses Multi-path synchronous playback function.Namely multichannel refers to multiple video channels of DVR, and a road represents a passage; Namely synchronized playback refers to can the simultaneously video file of the multiple passage of playback at one time in section, and playback duration and the main channel of each passage keep synchronous; Correspondingly, namely main channel refers in Multi-path synchronous replayed section as a passage with reference to standard.
Multi-path synchronous playback technology is mainly used in a large amount of video files and searches.Such as: within this time period of 1:00 ~ 3:00, have abnormal conditions to occur, so then need the video file of all control points in this time period of playback 1:00 ~ 3:00, to search concrete abnormal place and reason etc.
In actual applications, in order to save the memory space etc. of hard disk, for each passage, it all can not record a video usually for 24 hours always, but intermittently records a video, as when meeting the video recording condition preset at every turn, then record a video, and generate a video file.
In addition, according to the implementation of existing Multi-path synchronous playback technology, before starting to carry out Multi-path synchronous playback, namely need first to determine main channel, can be specified by user, also can be selected according to a certain rule by DVR, and, once determine using a certain passage as main channel, so in whole Multi-path synchronous replayed section, this passage just will always as main channel, and can not change to other passage.
So, if in the playback duration section of specifying, there is the video file wanting playback in main channel always, so the video file of other passage also can carry out playback, if but there is not the video file wanting playback in main channel in a certain sub-period, namely record a video in main channel in this sub-period, so because the playback duration of other passage needs to keep synchronous with main channel, even if therefore there is the video file wanting playback in other passage, also cannot carry out playback, thus reduce the search efficiency of video file.
Such as: the playback duration section that user specifies is 1:00 ~ 3:00, and specify 16 passages and carry out playback simultaneously, and dedicated tunnel 2 is as main channel, but there is not the video file wanting playback in passage 2 in this sub-period of 2:00 ~ 3:00, so whole replayed section just can only terminate when 2:00, correspondingly, the video file of other passage in this sub-period of 2:00 ~ 3:00 all cannot carry out playback.
Summary of the invention
In view of this, the invention provides a kind of Multi-path synchronous back method and device, the search efficiency of video recording can be improved.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of Multi-path synchronous back method, comprising:
Determine playback duration section and need to carry out M passage of Multi-path synchronous playback, M be greater than 1 positive integer;
For each passage, from video file corresponding to this passage, find out the video file be consistent with described playback duration section respectively;
According to time started and the end time of each video file found out, determining the passage as main channel in the different sub-periods in described playback duration section respectively, all there is the video file wanting playback in the passage as main channel in each sub-period;
According to determination result, carry out Multi-path synchronous playback according to the mode of different sub-period switching at runtime main channel.
A kind of Multi-path synchronous playback reproducer, comprising:
First processing module, for determining playback duration section and needing to carry out M passage of Multi-path synchronous playback, M be greater than 1 positive integer, and inform the second processing module;
Described second processing module, for for each passage, finds out the video file be consistent with described playback duration section respectively from video file corresponding to this passage; According to time started and the end time of each video file found out, determining the passage as main channel in the different sub-periods in described playback duration section respectively, all there is the video file wanting playback in the passage as main channel in each sub-period; According to determination result, carry out Multi-path synchronous playback according to the mode of different sub-period switching at runtime main channel.
Visible, adopt scheme of the present invention, no longer only a changeless main channel is used in whole Multi-path synchronous replayed section, but carry out Multi-path synchronous playback according to the mode of different sub-period switching at runtime main channel, thus make all video files in playback duration section all playback can be carried out as much as possible, and then improve the search efficiency of video file.
Accompanying drawing explanation
Fig. 1 is the flow chart of Multi-path synchronous back method embodiment of the present invention.
Fig. 2 is the schematic diagram of played file list of the present invention.
Fig. 3 is main channel of the present invention switching at runtime mode schematic diagram.
Fig. 4 is the composition structural representation of Multi-path synchronous playback reproducer embodiment of the present invention.
Embodiment
In order to make technical scheme of the present invention clearly, understand, to develop simultaneously embodiment referring to accompanying drawing, scheme of the present invention be described in further detail.
Fig. 1 is the flow chart of Multi-path synchronous back method embodiment of the present invention.As shown in Figure 1,11 ~ 14 are comprised the following steps.
Step 11: determine playback duration section and need to carry out M passage of Multi-path synchronous playback, M be greater than 1 positive integer.
Playback duration section and need the passage carrying out Multi-path synchronous playback all can be set by the user.
Step 12: for each passage, finds out the video file be consistent with playback duration section respectively from video file corresponding to this passage.
In this step, for each passage, following process can be carried out respectively:
A, for each video file corresponding to this passage, determine respectively time period that time started of this video file and end time limit with whether exist between playback duration section overlapping, if so, then this video file is defined as the video file be consistent with playback duration section;
Whether b, the total number determining the video file be consistent with playback duration section are 0, if not, then generate the played file list of this passage, can comprise in played file list: the channel number of this passage, the predetermined information of each video file be consistent with playback duration section, described predetermined information comprises: time started and end time, if so, then can end process.
For each video file, there is overlapping can referring between the time period that the time started of this video file and end time limit with playback duration section and partly overlap, also can refer to complete overlap.
Illustrate:
Playback duration section is 1:00 ~ 3:00, and time started and the end time of a certain video file are respectively 12:50 and 2:00, so then partly overlaps between time period of limiting of time started of this video file and end time and playback duration section;
Equally, playback duration section is 1:00 ~ 3:00, and time started and the end time of a certain video file are respectively 1:00 and 3:00, so time period of limiting of time started of this video file and end time be then complete overlapping between playback duration section.
For each passage, total number of the video file be consistent with playback duration section of its correspondence may be one, also may be multiple, also may be 0.
If 0, then can not deal with; If one or more, then need the played file list generating this passage, can comprise in played file list: the channel number of this passage, the predetermined information of each video file be consistent with playback duration section, described predetermined information can comprise: time started and end time.
In addition, described predetermined information also can comprise further: the length etc. of the type of video file, the memory address (memory address in a hard disk) of video file and video file, the follow-up playback correspondingly can carrying out video file according to these information.
Fig. 2 is the schematic diagram of played file list of the present invention.As shown in Figure 2, suppose to co-exist in M played file list, correspond respectively to M the passage that channel number is 1 ~ M, n represents total number of the video file be consistent with playback duration section that each passage is corresponding, is positive integer.
Step 13: according to time started and the end time of each video file found out, determining the passage as main channel in the different sub-periods in playback duration section respectively, all there is the video file wanting playback in the passage as main channel in each sub-period.
The specific implementation of this step can be:
A, using the time started of playback duration section as with reference to the time, and using each video file of finding out as seek scope;
B, determine whether to exist in seek scope the time started early than or equal the video file of reference time;
If so, then using a time started early than or equal the reference time video file as up-to-date reference paper;
If not, then from seek scope, determine time started and reference time nearest video file, and it can be used as up-to-date reference paper;
Passage corresponding for up-to-date reference paper is defined as main channel, and generate a main channel information, join in the list of main channel, this main channel information comprises: the time started of this main channel, the end time of this main channel, and the channel number of this main channel;
When up-to-date reference paper time started early than or equal the reference time and the end time equal or be later than playback duration section end time time, the time started of this main channel is the reference time, and the end time of this main channel is the end time of playback duration section;
When the time started of up-to-date reference paper be later than the reference time and the end time equal or be later than playback duration section end time time, the time started of this main channel is the time started of up-to-date reference paper, and the end time of this main channel is the end time of playback duration section;
When up-to-date reference paper time started early than or equal the reference time and the end time of end time early than playback duration section time, the time started of this main channel is the reference time, and the end time of this main channel is the end time of up-to-date reference paper;
When the time started of up-to-date reference paper be later than the reference time and the end time of end time early than playback duration section time, the time started of this main channel is the time started of up-to-date reference paper, and the end time of this main channel is the end time of up-to-date reference paper;
Further, when end time early than playback duration section end time of up-to-date reference paper, step C is performed, otherwise, end process;
C, determine in seek scope, whether to there is the video file that the end time is later than the end time of up-to-date reference paper; If so, then the video file being later than the end time of up-to-date reference paper the end time as seek scope, using the end time of up-to-date reference paper as with reference to the time, and repeated execution of steps B, otherwise, end process.
In above-mentioned steps B, when the time started in seek scope early than or total number of video file of equaling the reference time is greater than 1 time, therefrom can select an end time video file the latest, as up-to-date reference paper;
Similarly, when total number of time started in seek scope and reference time nearest video file is greater than 1, an end time video file the latest can therefrom be selected, as up-to-date reference paper.
Select end time video file the latest as up-to-date reference paper, the main channel switching times in Multi-path synchronous replayed section can be reduced, thus can system resource be saved.
In addition, the hypothetical reference time is 2:00, and suppose that the time started of a video file in seek scope is 1:50, the time started of another video file is 2:05, the time started of other video file is all later than 2:05, so as described in step B, the time started can be selected to be that the video file of 1:50 is as up-to-date reference paper, instead of the time started is the video file of 2:05, correspondingly, be that passage that the video file of 1:50 is corresponding is as up-to-date main channel using the time started, the benefit of such process is: can realize the playback of continuous print Multi-path synchronous, and be unlikely to appearance break period of 5 minutes, thus cause the playback cannot carrying out video file in these 5 minutes, and then reduce the search efficiency of video file.
Said process can illustrate as follows:
Suppose that the playback duration section that user specifies is 1:00 ~ 3:00, need the port number carrying out Multi-path synchronous playback to be 4, be respectively passage 1, passage 2, passage 3 and passage 4;
Wherein, the video file be consistent with playback duration section of passage 1 correspondence is: video file a1 and video file a2, time started and the end time of video file a1 are respectively 12:50 and 1:30, and time started and the end time of video file a2 are respectively 2:40 ~ 3:10;
The video file be consistent with playback duration section of passage 2 correspondence is: video file b1, and time started and end time are respectively 1:30 ~ 2:30;
The video file be consistent with playback duration section of passage 3 correspondence is: video file c1, and time started and end time are respectively 1:20 and 2:50;
The video file be consistent with playback duration section of passage 4 correspondence is: video file d1, and time started and end time are respectively 1:55 and 2:55;
So, in the sub-period of 1:00 ~ 1:30, can using passage 1 as main channel, corresponding reference paper is video file a1; In the sub-period of 1:30 ~ 2:50, can using passage 3 as main channel, corresponding reference paper is video file c1; In the sub-period of 2:50 ~ 3:00, can using passage 1 as main channel, corresponding reference paper is video file a2.
Step 14: according to determination result, carries out Multi-path synchronous playback according to the mode of different sub-period switching at runtime main channel.
In this step, according to the rise time of each main channel information in the list of main channel by the order after arriving first, in different sub-period switching at runtime main channel, and according to the information recorded in each played file list, Multi-path synchronous playback can be realized.
Fig. 3 is main channel of the present invention switching at runtime mode schematic diagram.As shown in Figure 3, in conjunction with above-mentioned citing, in this sub-period of 1:00 ~ 1:30, carry out Multi-path synchronous playback according to the mode being main channel with passage 1, be switched to passage 3 afterwards, namely in this sub-period of 1:30 ~ 2:50, Multi-path synchronous playback is carried out according to the mode being main channel with passage 3, be switched to passage 1 more afterwards, namely in this sub-period of 2:50 ~ 3:00, carry out Multi-path synchronous playback according to the mode being main channel with passage 1; In addition, for video file a1, playback can be carried out to it from 1:00, namely playback can not be carried out to it before this, for video file a2, when arriving 3:00, namely can terminate to carry out playback to it, namely can not proceed playback to it again, for video file c1, can terminate all to carry out playback to it to 2:50 from 1:20, just in this sub-period of 1:30 ~ 2:50, the passage of its correspondence is main channel, and in this sub-period of 1:20 ~ 1:30, the passage of its correspondence is not main channel.
In addition, in Multi-path synchronous replayed section, can according to the information recorded in each played file list, for each video file, this video file is obtained respectively according to the memory address of this video file, and the playback of this video file is carried out according to the type of this video file, time started and length etc., be implemented as prior art.
Based on above-mentioned introduction, Fig. 4 is the composition structural representation of Multi-path synchronous playback reproducer embodiment of the present invention.As shown in Figure 4, comprising:
First processing module, for determining playback duration section and needing to carry out M passage of Multi-path synchronous playback, M be greater than 1 positive integer, and inform the second processing module;
Second processing module, for for each passage, finds out the video file be consistent with described playback duration section respectively from video file corresponding to this passage; According to time started and the end time of each video file found out, determining the passage as main channel in the different sub-periods in described playback duration section respectively, all there is the video file wanting playback in the passage as main channel in each sub-period; According to determination result, carry out Multi-path synchronous playback according to the mode of different sub-period switching at runtime main channel.
Particularly,
Second processing module can for each passage, and for each video file corresponding to this passage, determine respectively time period that time started of this video file and end time limit with whether exist between described playback duration section overlapping, if so, then this video file is defined as the video file be consistent with described playback duration section; Whether the total number determining the video file be consistent with described playback duration section is 0, if not, then generate the played file list of this passage, this played file list comprises: the predetermined information of the video file that the channel number of this passage, each and described playback duration section are consistent, described predetermined information comprises: time started and end time.
In addition,
Second processing module can using the time started of described playback duration section as with reference to the time, using each video file of finding out as seek scope, and performs following predetermined process according to described reference time and described seek scope:
Determine whether to exist in described seek scope the time started early than or equal the video file of described reference time;
If so, then using a time started early than or equal the described reference time video file as up-to-date reference paper;
If not, then from described seek scope, determine time started and nearest video file of described reference time, and it can be used as up-to-date reference paper;
Passage corresponding for up-to-date reference paper is defined as main channel, and generate a main channel information, join in the list of main channel, this main channel information comprises: the time started of this main channel, the end time of this main channel, and the channel number of this main channel;
When up-to-date reference paper time started early than or equal the described reference time and the end time equal or be later than described playback duration section end time time, the time started of this main channel is the described reference time, and the end time of this main channel is the end time of described playback duration section;
When the time started of up-to-date reference paper be later than the described reference time and the end time equal or be later than described playback duration section end time time, the time started of this main channel is the time started of up-to-date reference paper, and the end time of this main channel is the end time of described playback duration section;
When up-to-date reference paper time started early than or equal the described reference time and the end time of end time early than described playback duration section time, the time started of this main channel is the described reference time, and the end time of this main channel is the end time of up-to-date reference paper;
When the time started of up-to-date reference paper be later than the described reference time and the end time of end time early than described playback duration section time, the time started of this main channel is the time started of up-to-date reference paper, and the end time of this main channel is the end time of up-to-date reference paper;
And, second processing module also can be further used for, when end time early than described playback duration section end time of up-to-date reference paper, determine in described seek scope, whether to there is the video file that the end time is later than the end time of up-to-date reference paper, if, then is later than the video file of the end time of up-to-date reference paper the end time as described seek scope, using the end time of up-to-date reference paper as the described reference time, and repeat described predetermined process, otherwise, end process.
In addition,
Second processing module also can be further used for, when the time started in described seek scope early than or total number of video file of equaling the described reference time is greater than 1 time, therefrom select an end time video file the latest, as up-to-date reference paper;
When total number of time started in described seek scope and nearest video file of described reference time is greater than 1, therefrom select an end time video file the latest, as up-to-date reference paper.
Further,
The predetermined information of described video file also can comprise further: the length of the type of video file, the memory address of video file and video file;
Correspondingly, second processing module can according to the rise time of each main channel information in the list of described main channel by the order after arriving first, in different sub-period switching at runtime main channel, and according to the information recorded in each played file list, realize Multi-path synchronous playback.
The specific works flow process of Fig. 4 shown device embodiment please refer to the respective description in preceding method embodiment, repeats no more herein.In actual applications, Fig. 4 shown device can be DVR etc.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a Multi-path synchronous back method, is characterized in that, comprising:
Determine playback duration section and need to carry out M passage of Multi-path synchronous playback, M be greater than 1 positive integer;
For each passage, from video file corresponding to this passage, find out the video file be consistent with described playback duration section respectively;
According to time started and the end time of each video file found out, determining the passage as main channel in the different sub-periods in described playback duration section respectively, all there is the video file wanting playback in the passage as main channel in each sub-period;
According to determination result, carry out Multi-path synchronous playback according to the mode of different sub-period switching at runtime main channel.
2. method according to claim 1, is characterized in that,
Described for each passage, from video file corresponding to this passage, find out the video file be consistent with described playback duration section respectively and comprise:
For each passage, carry out following process respectively:
For each video file that this passage is corresponding, determine respectively time period that time started of this video file and end time limit with whether exist between described playback duration section overlapping, if so, then this video file is defined as the video file be consistent with described playback duration section;
Whether the total number determining the video file be consistent with described playback duration section is 0, if not, then generate the played file list of this passage, this played file list comprises: the predetermined information of the video file that the channel number of this passage, each and described playback duration section are consistent, described predetermined information comprises: time started and end time.
3. method according to claim 2, is characterized in that,
According to the time started of each video file found out and end time, determine that the passage as main channel in the different sub-periods in described playback duration section comprises respectively:
A, using the time started of described playback duration section as with reference to the time, and using each video file of finding out as seek scope;
B, determine whether to exist in described seek scope the time started early than or equal the video file of described reference time;
If so, then using a time started early than or equal the described reference time video file as up-to-date reference paper;
If not, then from described seek scope, determine time started and nearest video file of described reference time, and it can be used as up-to-date reference paper;
Passage corresponding for up-to-date reference paper is defined as main channel, and generate a main channel information, join in the list of main channel, this main channel information comprises: the time started of this main channel, the end time of this main channel, and the channel number of this main channel;
When up-to-date reference paper time started early than or equal the described reference time and the end time equal or be later than described playback duration section end time time, the time started of this main channel is the described reference time, and the end time of this main channel is the end time of described playback duration section;
When the time started of up-to-date reference paper be later than the described reference time and the end time equal or be later than described playback duration section end time time, the time started of this main channel is the time started of up-to-date reference paper, and the end time of this main channel is the end time of described playback duration section;
When up-to-date reference paper time started early than or equal the described reference time and the end time of end time early than described playback duration section time, the time started of this main channel is the described reference time, and the end time of this main channel is the end time of up-to-date reference paper;
When the time started of up-to-date reference paper be later than the described reference time and the end time of end time early than described playback duration section time, the time started of this main channel is the time started of up-to-date reference paper, and the end time of this main channel is the end time of up-to-date reference paper;
Further, when end time early than described playback duration section end time of up-to-date reference paper, step C is performed, otherwise, end process;
C, determine in described seek scope, whether to there is the video file that the end time is later than the end time of up-to-date reference paper; If so, then the video file being later than the end time of up-to-date reference paper the end time as described seek scope, using the end time of up-to-date reference paper as the described reference time, and repeated execution of steps B, otherwise, end process.
4. method according to claim 3, is characterized in that,
The method comprises further:
When the time started in described seek scope early than or total number of video file of equaling the described reference time is greater than 1 time, therefrom select an end time video file the latest, as up-to-date reference paper;
When total number of time started in described seek scope and nearest video file of described reference time is greater than 1, therefrom select an end time video file the latest, as up-to-date reference paper.
5. the method according to claim 3 or 4, is characterized in that,
The predetermined information of described video file comprises further: the length of the type of video file, the memory address of video file and video file;
The described mode according to different sub-period switching at runtime main channel is carried out Multi-path synchronous playback and is comprised:
According to rise time of each main channel information in the list of described main channel by the order after arriving first, in different sub-period switching at runtime main channel, and according to the information recorded in each played file list, realize Multi-path synchronous playback.
6. a Multi-path synchronous playback reproducer, is characterized in that, comprising:
First processing module, for determining playback duration section and needing to carry out M passage of Multi-path synchronous playback, M be greater than 1 positive integer, and inform the second processing module;
Described second processing module, for for each passage, finds out the video file be consistent with described playback duration section respectively from video file corresponding to this passage; According to time started and the end time of each video file found out, determining the passage as main channel in the different sub-periods in described playback duration section respectively, all there is the video file wanting playback in the passage as main channel in each sub-period; According to determination result, carry out Multi-path synchronous playback according to the mode of different sub-period switching at runtime main channel.
7. device according to claim 6, is characterized in that,
Described second processing module is for each passage, and for each video file corresponding to this passage, determine respectively time period that time started of this video file and end time limit with whether exist between described playback duration section overlapping, if so, then this video file is defined as the video file be consistent with described playback duration section; Whether the total number determining the video file be consistent with described playback duration section is 0, if not, then generate the played file list of this passage, this played file list comprises: the predetermined information of the video file that the channel number of this passage, each and described playback duration section are consistent, described predetermined information comprises: time started and end time.
8. device according to claim 7, is characterized in that,
The time started of described playback duration section as with reference to the time, using each video file of finding out as seek scope, and is performed following predetermined process according to described reference time and described seek scope by described second processing module:
Determine whether to exist in described seek scope the time started early than or equal the video file of described reference time;
If so, then using a time started early than or equal the described reference time video file as up-to-date reference paper;
If not, then from described seek scope, determine time started and nearest video file of described reference time, and it can be used as up-to-date reference paper;
Passage corresponding for up-to-date reference paper is defined as main channel, and generate a main channel information, join in the list of main channel, this main channel information comprises: the time started of this main channel, the end time of this main channel, and the channel number of this main channel;
When up-to-date reference paper time started early than or equal the described reference time and the end time equal or be later than described playback duration section end time time, the time started of this main channel is the described reference time, and the end time of this main channel is the end time of described playback duration section;
When the time started of up-to-date reference paper be later than the described reference time and the end time equal or be later than described playback duration section end time time, the time started of this main channel is the time started of up-to-date reference paper, and the end time of this main channel is the end time of described playback duration section;
When up-to-date reference paper time started early than or equal the described reference time and the end time of end time early than described playback duration section time, the time started of this main channel is the described reference time, and the end time of this main channel is the end time of up-to-date reference paper;
When the time started of up-to-date reference paper be later than the described reference time and the end time of end time early than described playback duration section time, the time started of this main channel is the time started of up-to-date reference paper, and the end time of this main channel is the end time of up-to-date reference paper;
And, described second processing module is further used for, when end time early than described playback duration section end time of up-to-date reference paper, determine in described seek scope, whether to there is the video file that the end time is later than the end time of up-to-date reference paper, if, then is later than the video file of the end time of up-to-date reference paper the end time as described seek scope, using the end time of up-to-date reference paper as the described reference time, and repeat described predetermined process, otherwise, end process.
9. device according to claim 8, is characterized in that,
Described second processing module is further used for, when the time started in described seek scope early than or total number of video file of equaling the described reference time is greater than 1 time, therefrom select an end time video file the latest, as up-to-date reference paper;
Described second processing module is further used for, and when total number of time started in described seek scope and nearest video file of described reference time is greater than 1, therefrom selects an end time video file the latest, as up-to-date reference paper.
10. device according to claim 8 or claim 9, is characterized in that,
The predetermined information of described video file comprises further: the length of the type of video file, the memory address of video file and video file;
Described second processing module by the order after arriving first, in different sub-period switching at runtime main channel, and according to the information recorded in each played file list, realizes Multi-path synchronous playback according to the rise time of each main channel information in the list of described main channel.
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| CN201410029642.4A CN104702876B (en) | 2014-01-22 | 2014-01-22 | A kind of Multi-path synchronous back method and device |
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| CN201410029642.4A CN104702876B (en) | 2014-01-22 | 2014-01-22 | A kind of Multi-path synchronous back method and device |
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| CN201410029642.4A Active CN104702876B (en) | 2014-01-22 | 2014-01-22 | A kind of Multi-path synchronous back method and device |
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