CN102184739A - Video play device and method - Google Patents
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Abstract
The invention is applicable to the filed of video monitoring, and provides a video play device and method. The video play device comprises a control unit and an output unit, wherein the control unit is used for sending video file data to the output unit and receiving and responding to a feedback command sent by the output unit; and the output unit is used for buffering received video file data, comparing the currently residual buffer memory size and a preset parameter, and sending a feedback command of a corresponding type to the control unit according to the comparison result, wherein the preset parameter is more than 0 and less than the maximum buffer memory size of the output unit. In the embodiment of the invention, the communication mechanism between the control unit and the output unit is controlled to ensure the optimal time when the control unit sends the video file data to the output unit, so that the control unit and the output unit can be synchronized without covering the video file data.
Description
Technical field
The invention belongs to field of video monitoring, relate in particular to a kind of video recording playing device and method.
Background technology
Concerning the watch-dog of function complexity, the playback function of video file is a basic function of watch-dog, and the historical video file that it can the playback watch-dog reproduces the scene of being recorded.This playback function is realized jointly by control module and output unit: at first, control module reads the audio-video document of having stored from memory module, send to output unit by certain transmission mode then, output unit is decoded to the audio, video data that receives again, the audio, video data behind the last output decoder.
In the existing video file back method, control module sends the speed of video file data to output unit with different times speed control systems, (1) send video file data to be less than or equal to 1 doubly speed: control module sends video file data to be less than or equal to 1 doubly speed to output unit, the video file data that the passive reception control module of output unit sends, and the video file data that receives of buffer memory.This method is bigger to the buffer size dependence of output unit, if buffer area is very little, cacheable video file data is very little, then output unit is when coded data, output data etc. are busy at the same time, may cover the video file data of reception, thereby when playing back videos, produce mosaic phenomenon; If buffer area is very big, cacheable video file data is very big, and then output unit will cause the time-delay of video when coded data, output data etc. are busy at the same time, and can't realize the synchronous of two modules, make some playback operations wait and to respond at once as suspending.(2) send video file data with the doubly speed greater than 1: control module adopts the send mode of jumping the I frame that video file data is sent to output unit usually, and therefore this method has lost lot of data owing to lost some I frames.
Summary of the invention
The embodiment of the invention provides a kind of video recording playing device, is intended to solve the problem that existing video recorder covers or loses video file data when the playback video file.
The embodiment of the invention is achieved in that a kind of video recording playing device, and described device comprises control module and output unit,
Described control module is used to send video file data to described output unit, and receives and respond the feedback command that described output unit sends;
Described output unit is used for the described video file data that buffer memory receives, and after the buffer memory capacity value of current residual and default parameter compared, according to the feedback command of comparative result to control module transmission corresponding types, but described default parameter is greater than 0 and less than output unit buffer memory capacity value.
Another purpose of the embodiment of the invention is to provide a kind of video recording player method, and described method comprises the steps:
Control module sends video file data to output unit;
The described video file data that described output unit buffer memory receives, and the buffer memory capacity value of current residual and default parameter compared, described default parameter be greater than 0 and less than total buffer memory capacity value;
Described output unit sends the feedback command of corresponding types to control module according to result relatively;
Described control module receives feedback command, and determines whether to send video file data to described output unit according to described feedback command.
In the embodiment of the invention, the video file data that output unit 2 caching control units 1 send, and the buffer memory capacity value of current residual and default parameter compared, if result relatively is the output unit 2 current buffer memory video file datas that do not needed, then send the feedback command that stops to send video file data to control module 1, if result relatively is the output unit 2 current buffer memory video file datas that also need, then send the feedback command that begins to send video file data to control module 1, guaranteed that by the communication mechanism between control module 1 and the output unit 2 control module 1 sends the optimum transmitting time of video file data to output unit 2, make control module 1 and output unit 2 can cover video file data synchronously and not, further, because control module 1, therefore can guarantee the key message of video to send the key video sequence frame of video files greater than the speed of 1 times of speed to output unit 2 and not lose.
Description of drawings
Fig. 1 is the video recording playing device structure that first embodiment of the invention provides;
Fig. 2 is the video recording player method flow process that second embodiment of the invention provides.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the embodiment of the invention, the video file data that the output unit caching control unit sends, and the buffer memory capacity value of current residual and default parameter compared, send corresponding feedback command according to result relatively to control module again.If output unit sends the order begin to send video file data to control module, and control module with greater than the speed of 1 times of speed when output unit sends video data, this video data is all key frames of video.
It is a kind of that the embodiment of the invention provides: a kind of video recording playing device and method.
Described device comprises: control module and output unit,
Described control module is used to send video file data to described output unit, and receives and respond the feedback command that described output unit sends;
Described output unit is used for the described video file data that buffer memory receives, and after the buffer memory capacity value of current residual and default parameter compared, according to the feedback command of comparative result to control module transmission corresponding types, but described default parameter is greater than 0 and less than output unit buffer memory capacity value.
Described method comprises: control module sends video file data to output unit;
The described video file data that described output unit buffer memory receives, and the buffer memory capacity value of current residual and default parameter compared, described default parameter be greater than 0 and less than total buffer memory capacity value;
Described output unit sends the feedback command of corresponding types to control module according to result relatively;
Described control module receives feedback command, and determines whether to send video file data to described output unit according to described feedback command.
In the embodiment of the invention, the video file data that output unit 2 caching control units 1 send, and the buffer memory capacity value of current residual and default parameter compared, if result relatively is the output unit 2 current buffer memory video file datas that do not needed, then send the feedback command that stops to send video file data to control module 1, if result relatively is the output unit 2 current buffer memory video file datas that also need, then send the feedback command that begins to send video file data to control module 1, guaranteed that by the communication mechanism between control module 1 and the output unit 2 control module 1 sends the optimum transmitting time of video file data to output unit 2, make control module 1 and output unit 2 can cover video file data synchronously and not, further, because control module 1, therefore can guarantee the key message of video to send the key video sequence frame of video files greater than the speed of 1 times of speed to output unit 2 and not lose.
For technical solutions according to the invention are described, describe below by specific embodiment.
Embodiment one:
Fig. 1 shows the structure of the video recording playing device that first embodiment of the invention provides, and for convenience of explanation, has only exported part related to the present invention.
This video recording playing device can be to run on the unit that software unit, hardware cell or software and hardware in the terminal combine, and also can be used as independently, suspension member is integrated in these terminals or runs in the application system of these terminals, wherein:
Control module 1 is used to send video file data to output unit and receive and respond the feedback command that this output unit sends.
Output unit 2 is used for the video file data that buffer memory receives, and after the buffer memory capacity value of current residual and default parameter compared, sends feedback command according to result relatively to control module 1.
In the present embodiment, the buffer memory capacity value of current residual equals capability value poor of output unit 2 cacheable total volume values and current buffer memory, but default parameter be greater than 0 and less than the number of output unit 2 buffer memory capacity values, is used for determining the type of output unit 2 to the feedback command of control module 1 transmission.Further, output unit 2 reads the video file data of buffer area, and is sent to decoder decode, the video file data behind the last output decoder.
As an alternative embodiment of the invention, send in the process of video file data to output unit 2 at control module 1, control module 1 can also send to output unit 2 suspend, locate, stop, frame advances, retreat and order such as recovery, wherein, suspend when control module 1 sends to output unit 2, when ceasing and desisting order, stop to send video file data to output unit 2, when control module 1 advances, during order such as recovery, continues to send video file datas to output unit 2 to output unit 2 transmit frames.
As an alternative embodiment of the invention, this output unit 2 comprises: cease and desist order sending module 21 and initiation command sending module 22.
This sending module 21 of ceasing and desisting order is used for during less than default first parameter, sending the order that stop to send video file data to control module 1 in the buffer memory capacity value of current residual.
This initiation command sending module 22 is used for during greater than default second parameter, sending the order that begin send video file data to control module 1 in the buffer memory capacity value of current residual.
In the present embodiment, second default parameter and the first default parameter are default parameter, and the first default parameter less than the second default parameter and default first parameter and second parameter all less than the maximum capacity of buffer area.Further, the maximum capacity of supposing buffer area is 1024K, and then Yu She first parameter can be 128K, and the second default parameter can be 512K.
As an alternative embodiment of the invention, this control module 1 comprises: stop sending module 11 and beginning sending module 12.
This stops sending module 11, be used for receive that the sending module 21 of ceasing and desisting order sends stop to send the feedback command of video file data the time, stop to send video file datas to output unit 2.
This begins sending module 12, be used for receive that initiation command sending module 22 sends begin to send the feedback command of video file data the time, beginning sends video file datas to output unit 2.
As an alternative embodiment of the invention, this begins sending module 12 and comprises audio frequency sending module 121 and video sending module 122.
Audio frequency sending module 121, be used for the speed of 1 times of speed when output unit 2 sends video file datas, send the video file data that comprises voice data to output unit 2;
Video sending module 122 is used for sending video data to output unit 2.
As an alternative embodiment of the invention, this control module 1 also comprises: first time delay determination module 13 and second time delay determination module 14.
This, determination module 13 first time delay, be used for video sending module 122 with the speed that is less than or equal to 1 times of speed when output unit sends video file data, the video file data that is sent is whole video requency frame data, then can determine the time delay of all video requency frame datas that output unit output receives according to the scheduling time of video frame rate, times speed and system.
Wherein, all frame of video of video file comprise I frame, B frame and P frame, and the I frame is also referred to as key frame, video frame rate depends on video type, common video type has N standard and P standard, and when video type was the N standard, video frame rate was 30 frame/seconds, when video type was the P standard, video frame rate was 25 frame/seconds.The interval transmitting time of frame of video can use following formula to calculate:
The scheduling time of interval transmitting time=1000000/ of frame of video (doubly fast * video frame rate) system
This, determination module 14 second time delay, be used for video sending module 122 with greater than the speed of 1 times of speed when output unit sends video file data, the video file data that is sent is the key frame data of video, then can determine the time delay of the key video sequence frame data that output unit output receives according to the scheduling time of video frame rate and system.
Wherein, the interval transmitting time of frame of video can use following formula to calculate:
The scheduling time of interval transmitting time=1000000/ times speed one system of frame of video
Certainly, the embodiment of the invention also can send video file data according to control module and keep corresponding P frame and B number of frames to the multiple that output unit adopted is different, repeats no more herein.
In first embodiment of the invention, the video file data that output unit 2 caching control units 1 send, and the buffer memory capacity value of current residual and default parameter compared, if result relatively is the output unit 2 current buffer memory video file datas that do not needed, then send the feedback command that stops to send video file data to control module 1, if result relatively is the output unit 2 current buffer memory video file datas that also need, then send the feedback command that begins to send video file data to control module 1, guaranteed that by the communication mechanism between control module 1 and the output unit 2 control module 1 sends the optimum transmitting time of video file data to output unit 2, make control module 1 and output unit 2 can cover video file data synchronously and not, further, because control module 1, therefore can guarantee the key message of video to send the key video sequence frame of video files greater than the speed of 1 times of speed to output unit 2 and not lose.
Embodiment two:
Fig. 2 shows the flow process of the video recording player method that second embodiment of the invention provides, and details are as follows:
1, control module sends video file data to output unit.
In the present embodiment, the video file data of control module transmission is video data or audio, video data.
Can make the people joyful according to the voice data under the normal playback speed, but not the voice data under the normal playback speed is then as the characteristics of noise, when using normal playback speed to play video file, control module sends audio, video data to output unit, when using trick play speed to play video file, control module sends video data to output unit.Wherein, normal playback speed is the broadcasting speed of 1 times of speed, and trick play speed is the broadcasting speed of 1/16 times of speed or 1/8 times of speed or 1/4 times of speed or 1/2 times of speed or 2X times of speed or 4X times of speed or 8X times of speed or 16X times of non-1 times of speed such as speed.
As an alternative embodiment of the invention, send in the process of video file data to output unit at control module, control module can also send to output unit suspend, locate, stop, frame advances, retreat and order such as recovery, wherein, when control module to output unit send to suspend, when ceasing and desisting order, stop to send video file data, when control module advances, during order such as recovery, continues to send video file data to output unit to the output unit transmit frame to output unit.In the present embodiment, because there is video cache in output unit, therefore needs control module to send pause command and could realize suspending broadcast to output unit; If need to realize the positioning playing function, then control module is at first located accordingly to the key frame (I frame) of video file data, again the key frame of location is sent to output unit; If need to realize stopping playing function, then control module sends and ceases and desist order to output unit, and is positioned to first frame of video file data, again this first frame is sent to output unit; If need achieve frame to advance playing function, then control module sends a frame to output unit at every turn and just stops later on sending, and waits for order next time; If need to realize retreating playing function, after then control module receives backward command, stop to send voice data to output unit, and search the 2nd I frame forward from present frame, this I frame is begun to send to output unit, up to the reference position of frame of video, certainly, if stop to realize fallback function in sending the process of frame of video to output unit, then control module no longer sends to output unit with frame of video.
2, the video file data that receives of output unit buffer memory, and the buffer memory capacity value of current residual and default parameter compared, corresponding feedback command sent according to result relatively to control module at last.
In embodiments of the present invention, output unit receives the video file data that control module sends, and the video file data that buffer memory receives in buffer area.Output unit compares the buffer memory capacity value of current residual and the size of parameter preset, in the buffer memory capacity value of current residual during less than default first parameter, output unit sends the feedback command that stops to send video file data to control module, during greater than default second parameter, output unit sends the feedback command that begins to send video file data to control module in the buffer memory capacity value of current residual.Wherein, the maximum capacity that the buffer memory capacity value of current residual equals buffer area deducts the capability value of buffer memory video file data, certainly, default parameter comprises the first default parameter and second parameter, and the first default parameter and second parameter are all less than the maximum capacity of buffer area, and the first default parameter is less than the second default parameter.Further, the maximum capacity of supposing buffer area is 1024K, and then Yu She first parameter can be 128K, and the second default parameter can be 512K.
As an alternative embodiment of the invention, output unit reads the video file data of buffer area, and is sent to decoder decode, the video file data behind the last output decoder.In the present embodiment, because video file data all is through encoding, therefore need using decoder decode before output.
3, control module responds the feedback command that output unit sends.
In embodiments of the present invention, control module receives that output unit sends stops the feedback command that to send the feedback command of video file data or begin to send video file data, and the feedback command that receives of response.If what control module received is the feedback command that stops to send video file data, then control module stops to send video file data to output unit; If what control module received is the feedback command that begins to send video file data, then control module begins to send video file data to output unit.If control module sends video file data with the speed of 1 times of speed to output unit, then control module sends the video file data that comprises audio, video data to output unit, and control module is with which doubly fast video file data that all comprises video data to output unit transmission video file data to the output unit transmission.
As an alternative embodiment of the invention, the step of control module after the step of output unit transmission video data further comprises: to the interval time that this output unit is exported this video data, promptly output unit is exported the time delay of the video data that receives to the definite transmission of control module video data to output unit.
(1) control module with the speed that is less than or equal to 1 times of speed when output unit sends video file data, the video file data that is sent is whole video requency frame data, then can determine the time delay of all video requency frame datas that output unit output receives according to the scheduling time of video frame rate, times speed and system.Wherein, all frame of video of video file comprise I frame, B frame and P frame, and the I frame is also referred to as key frame, video frame rate depends on video type, common video type has N standard and P standard, and when video type was the N standard, video frame rate was 30 frame/seconds, when video type was the P standard, video frame rate was 25 frame/seconds.Can use following formula to calculate the time delay of the video data that output unit output receives:
The scheduling time of time delay=1000000/ (doubly fast * video frame rate) system
(2) control module with greater than the speed of 1 times of speed when output unit sends video file data, the video file data that is sent is the key frame data of video, then can determine the time delay of the key video sequence frame data that output unit output receives according to the scheduling time of video frame rate and system.Wherein, can use following formula to calculate the time delay of the key video sequence frame data of output unit output reception:
The scheduling time of time delay=1000000/ times speed-system
In the present embodiment, also can send video file data and keep corresponding P frame and B number of frames, repeat no more herein to the multiple that output unit adopted is different according to control module.
In second embodiment of the invention, the video file data that the output unit caching control unit sends, and the buffer memory capacity value of current residual and default parameter compared, if result relatively is the current buffer memory video file data that do not needed of output unit, then send the feedback command that stops to send video file data to control module, if result relatively is the current buffer memory video file data that also needs of output unit, then send the feedback command that begins to send video file data to control module, guaranteed that by the communication mechanism between control module and the output unit control module sends the optimum transmitting time of video file data to output unit, and can not cover video file data, further, since control module with greater than the speed of 1 times of speed when output unit sends video file data, stop to send voice data, therefore but each key video sequence frame is all sent to output unit, guaranteed that the key message of video do not lose.
In order to be illustrated more clearly in the process of the interval transmitting time of calculating frame of video, describe with a concrete application examples below.
Embodiment three:
1, suppose that control module sends video file data with the speed of 2 times of speed to output unit, the playback video frame per second is the video data of 25 frame/seconds, and then control module stops to send voice data to output unit, and only sends key frame I frame.
Control module obtains frame of video in proper order, if what obtain is the I frame, then this I frame is sent to output unit, wherein, send to output unit after, it is time delay of key frame to be that this output unit output receives:
The scheduling time of time delay=1000000/ times speed system
The scheduling time of this system is relevant with operating system, and the scheduling time of supposing the system is 10000ms, then time delay=1000000/2-10000=490000ms.
2, suppose that control module sends video file data with the speed of 1/4 times of speed to output unit, the playback video frame per second is the video data of 30 frame/seconds, and then control module stops to send voice data to output unit, but sends all frame of video to output unit.Then be the time delay of all videos of output unit output reception:
The scheduling time of time delay=1000000/ (doubly fast * video frame rate)-system, the scheduling time of supposing the system is 10000ms, then
Time delay=1000000/ ((1/4) * 30)-10000=123333ms
In the embodiment of the invention, the video file data that output unit 2 caching control units 1 send, and the buffer memory capacity value of current residual and default parameter compared, if result relatively is the output unit 2 current buffer memory video file datas that do not needed, then send the feedback command that stops to send video file data to control module 1, if result relatively is the output unit 2 current buffer memory video file datas that also need, then send the feedback command that begins to send video file data to control module 1, guaranteed that by the communication mechanism between control module 1 and the output unit 2 control module 1 sends the optimum transmitting time of video file data to output unit 2, make control module 1 and output unit 2 can cover video file data synchronously and not, further, because control module 1, therefore can guarantee the key message of video to send the key video sequence frame of video files greater than the speed of 1 times of speed to output unit 2 and not lose.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a video recording playing device is characterized in that described device comprises control module and output unit,
Described control module is used to send video file data to described output unit, and receives and respond the feedback command that described output unit sends;
Described output unit is used for the described video file data that buffer memory receives, and after the buffer memory capacity value of current residual and default parameter compared, according to the feedback command of comparative result to control module transmission corresponding types, but described default parameter is greater than 0 and less than output unit buffer memory capacity value.
2. device as claimed in claim 1 is characterized in that, described default parameter comprises first default parameter and the second default parameter, and the described first default parameter is less than the described second default parameter, and described output unit comprises:
The sending module of ceasing and desisting order is used for during less than default first parameter, sending the feedback command that stops to send video file data in the buffer memory capacity value of current residual to control module;
The initiation command sending module is used for during greater than default second parameter, sending the feedback command that begins to send video file data in the buffer memory capacity value of current residual to control module.
3. device as claimed in claim 2 is characterized in that, described control module comprises:
Stop sending module, be used for receive that the described sending module of ceasing and desisting order sends stop to send the feedback command of video file data the time, stop to send video file data to output unit;
The beginning sending module, be used for receive that described initiation command sending module sends begin to send the feedback command of video file data the time, beginning sends video file data to output unit.
4. device as claimed in claim 3 is characterized in that, described beginning sending module comprises:
The audio frequency sending module, be used for the speed of 1 times of speed when output unit sends video file data, send the video file data that comprises voice data to output unit;
The video sending module is used for sending video data to output unit.
5. device as claimed in claim 4 is characterized in that, described control module also comprises:
First time delay determination module, be used for sending when comprising the video file data of all videos frame data to output unit with the speed that is less than or equal to 1 times of speed, determine the time delay of all video requency frame datas that output unit output receives according to the scheduling time of video frame rate, times speed and system at the video sending module;
Second time delay determination module, be used for the video sending module with greater than the speed of 1 times of speed when output unit sends the video file data of the key frame data that comprises video, determine the time delay of the key video sequence frame data that output unit output receives according to the scheduling time of video frame rate and system.
6. a video recording player method is characterized in that described method comprises the steps:
Control module sends video file data to output unit;
The described video file data that described output unit buffer memory receives, and the buffer memory capacity value of current residual and default parameter compared, described default parameter be greater than 0 and less than total buffer memory capacity value;
Described output unit sends the feedback command of corresponding types to control module according to result relatively;
Described control module receives feedback command, and determines whether to send video file data to described output unit according to described feedback command.
7. method as claimed in claim 6 is characterized in that, described output unit is specially to the step that control module sends the feedback command of corresponding types according to result relatively:
During less than default first parameter, output unit sends the order that stops to send video file data to control module in the buffer memory capacity value of current residual;
During greater than default second parameter, output unit sends the order that begins to send video file data to control module in the buffer memory capacity value of current residual;
Described first default parameter and the second default parameter are described default parameter, and the described first default parameter is less than the described second default parameter.
8. method as claimed in claim 6 is characterized in that, described control module receives feedback command, and determines whether that according to described feedback command the step that sends video file data to described output unit is specially:
If the feedback command that control module receives is the order that stops to send video file data, then described control module stops to send video file data to described output unit;
If the feedback command that control module receives is the order that begins to send video file data, then described control module begins to send video file data to described output unit.
9. method as claimed in claim 8 is characterized in that, and is described if the feedback command that control module receives is the order that begins to send video file data, and then described control module begins to be specially to the step of described output unit transmission video file data:
If described control module sends video file data with the speed of 1 times of speed to described output unit, then described control module sends the video file data that comprises voice data to described output unit;
Described control module sends the video file data that comprises video data to described output unit.
10. method as claimed in claim 9 is characterized in that, further comprises the steps: after described output unit sends the step of the video file data that comprises video data at described control module
Send when comprising the video file data of all videos frame data to output unit with the speed that is less than or equal to 1 times of speed at control module, determine the time delay of all video requency frame datas that output unit output receives according to the scheduling time of video frame rate, times speed and system;
Control module with greater than the speed of 1 times of speed when output unit sends the video file data of the key frame data that comprises video, determine the time delay of the key video sequence frame data that output unit output receives according to the scheduling time of video frame rate and system.
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| CN102623032A (en) * | 2012-04-01 | 2012-08-01 | 深圳英飞拓科技股份有限公司 | Method for realizing synchronous playback of hard disk recorder |
| CN102623032B (en) * | 2012-04-01 | 2014-09-17 | 深圳英飞拓科技股份有限公司 | Method for realizing synchronous playback of hard disk recorder |
| CN103516389A (en) * | 2012-06-21 | 2014-01-15 | 幻音科技(深圳)有限公司 | Data signal transmission method and system, signal transmission control method and system |
| CN106463139B (en) * | 2014-06-26 | 2021-03-12 | 索尼公司 | Decoding device, decoding method, and program |
| CN105744200A (en) * | 2016-02-22 | 2016-07-06 | 深圳英飞拓科技股份有限公司 | Video monitoring video storage method and device |
| CN105744200B (en) * | 2016-02-22 | 2019-03-12 | 深圳英飞拓科技股份有限公司 | The storage method and device of surveillance video |
| CN107613365A (en) * | 2017-09-04 | 2018-01-19 | 浙江大华技术股份有限公司 | A kind of video broadcasting method and device |
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| Publication number | Publication date |
|---|---|
| CN102184739B (en) | 2012-11-07 |
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