CN104394453A - Video prerecording method and device - Google Patents
Video prerecording method and device Download PDFInfo
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- CN104394453A CN104394453A CN201410677201.5A CN201410677201A CN104394453A CN 104394453 A CN104394453 A CN 104394453A CN 201410677201 A CN201410677201 A CN 201410677201A CN 104394453 A CN104394453 A CN 104394453A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4335—Housekeeping operations, e.g. prioritizing content for deletion because of storage space restrictions
Abstract
The invention is applicable to the technical field of video processing, and provides a video prerecording method and device. The method includes the steps: acquiring prerecording time and prerecording frame rate, and determining the number F of prerecording frames according to the acquired prerecording time and the acquired prerecording frame rate; writing the prerecording frames into a memory, forming a prerecording image group by N prerecording frames, forming a prerecording data block by M prerecording image groups; writing the prerecording data block in the memory to an external storage device after any prerecording data block in the memory is formed if the determined number F of the prerecording frames is larger than a preset value. A first frame of the prerecording image group is a key frame. The external storage device is used as a prerecording cache, and the prerecording time is not limited by the capacity of the memory, so that long prerecording time can be supported. The prerecording frames in the memory are written into the external storage device according to blocks, so that the writing throughput rate of the external storage device is increased.
Description
Technical field
The invention belongs to technical field of video processing, particularly relate to video preprocessor recording method and device.
Background technology
In digital VTR application, triggering video recording when the event of generation, and provide the video recording of pre-recording of front N second of generation event, is a very important function.Wherein, N is greater than 0.But different user has different demands for the time of pre-recording.
In prior art, generally select internal memory as buffer memory of pre-recording.Suppose there are 4 passages, the code check of each passage is 2Mbps, and the maximum time of pre-recording is 30 seconds, then memory size is minimum is 2Mbps × 30s × 4=30MB.Owing to being subject to the restriction of memory size, therefore, pre-record time of pre-recording of mode of existing video is short.
Summary of the invention
Given this, embodiments provide a kind of video preprocessor recording method and device, to pre-record the restriction being subject to memory size, time of pre-recording short problem to solve existing video.
On the one hand, provide a kind of video preprocessor recording method, comprising:
Acquisition is pre-recorded time and frame per second of pre-recording, and pre-record according to acquisition time and frame per second of pre-recording determine the frame number F that pre-records, wherein, F be greater than 0 integer;
To pre-record frame write memory, and frame of pre-recording described in N number of to be formed a pre-recorded video group, M described pre-recorded video group is formed a prerecorded data block, wherein, first frame of described pre-recorded video group is key frame, N be greater than 1 integer, M be more than or equal to 1 integer;
If pre-record described in determining, frame number F is greater than the first preset value, then, after the arbitrary prerecorded data block composition in described internal memory, the prerecorded data block in described internal memory is writen to External memory equipment.
Second aspect, provides a kind of video preprocessor recording device, comprising:
Pre-record frame number determination module, for obtaining pre-record time and frame per second of pre-recording, pre-record according to acquisition time and frame per second of pre-recording determine the frame number F that pre-records, wherein, F be greater than 0 integer;
Prerecorded data block comprising modules, for frame write memory of pre-recording, frame of pre-recording described in N number of is formed a pre-recorded video group, M described pre-recorded video group is formed a prerecorded data block, wherein, first frame of described pre-recorded video group is key frame, N be greater than 1 integer, M be more than or equal to 1 integer;
To pre-record cache module, if be greater than the first preset value for the frame number F that pre-records described in determining, then, after the arbitrary prerecorded data block composition in described internal memory, the prerecorded data block in described internal memory is writen to External memory equipment.
The beneficial effect that the embodiment of the present invention compared with prior art exists is: the embodiment of the present invention by using External memory equipment as buffer memory of pre-recording, make the time of pre-recording by the restriction of memory size, thus long pre-recording the time can be supported; To pre-record in advance frame write memory, N number of frame of pre-recording is formed a pre-recorded video group, M pre-recorded video group is formed a prerecorded data block, again the prerecorded data block in internal memory is writen to External memory equipment, frame of pre-recording thus writes External memory equipment by block, thus improve External memory equipment write throughput.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the realization flow figure of the video preprocessor recording method that the embodiment of the present invention provides;
Fig. 2 is the specific implementation flow chart described in the video preprocessor recording method step S103 that provides of the embodiment of the present invention, the prerecorded data block in described internal memory being writen to External memory equipment;
Fig. 3 is the structured flowchart of the video preprocessor recording device that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention by using External memory equipment as buffer memory of pre-recording, make the time of pre-recording by the restriction of memory size, thus long pre-recording the time can be supported; To pre-record in advance frame write memory, N number of frame of pre-recording is formed a pre-recorded video group, M pre-recorded video group is formed a prerecorded data block, again the prerecorded data block in internal memory is writen to External memory equipment, frame of pre-recording thus writes External memory equipment by block, thus improve External memory equipment write throughput.
Fig. 1 shows the realization flow figure of the video preprocessor recording method that the embodiment of the present invention provides, and details are as follows:
In step S101, obtain and to pre-record time and frame per second of pre-recording, pre-record according to acquisition time and frame per second of pre-recording determine the frame number F that pre-records, wherein, F be greater than 0 integer.
In embodiments of the present invention, the time of pre-recording by system default, also can be arranged by user.Acquisition is pre-recorded time and frame per second of pre-recording, and can determine according to the time of pre-recording and frame per second of pre-recording the frame number F that pre-records.Suppose that the time of pre-recording is 30 seconds, frame per second of pre-recording is 30FPS (Frame Per Second, frame is per second), then frame number F=900 frame of pre-recording.When the frame number F that pre-records is greater than the first preset value, adopt External memory equipment as buffer memory of pre-recording; When the frame number F that pre-records is less than or equal to the first preset value, adopt internal memory as buffer memory of pre-recording.Adaptive buffering scheme of pre-recording is provided thus according to the different demands of user.
In step s 102, frame write memory of pre-recording, forms a pre-recorded video group by frame of pre-recording described in N number of, M described pre-recorded video group is formed a prerecorded data block, and wherein, the first frame of described pre-recorded video group is key frame, N be greater than 1 integer, M be more than or equal to 1 integer.
Throughput is write in order to what improve External memory equipment, before frame of pre-recording is writen to External memory equipment, to pre-record frame write memory, N number of frame of pre-recording is formed a pre-recorded video group (GOP, Group OfPictures), M pre-recorded video group is formed a prerecorded data block, in units of data block, the frame of pre-recording in internal memory is writen to External memory equipment.Thus achieve by block write External memory equipment, reduce the frequent degree that External memory equipment I/O (Input and Output, input and output) operates, reduce power consumption simultaneously.
In step s 103, if the frame number F that pre-records described in determining is greater than the first preset value, then, after the arbitrary prerecorded data block composition in described internal memory, the prerecorded data block in described internal memory is writen to External memory equipment.
When the frame number F that pre-records is greater than the first preset value, adopt External memory equipment as buffer memory of pre-recording.After being made up of a prerecorded data block in internal memory, the prerecorded data block in this internal memory is writen to External memory equipment, and deletes this prerecorded data block in internal memory.
When the frame number F that pre-records is less than or equal to the first preset value, adopt internal memory as buffer memory of pre-recording.When all frames of pre-recording all write in internal memory, and after all frames of pre-recording all form prerecorded data block, detect whether receive video recording instruction, if so, prerecorded data block is exported in the video file of External memory equipment; If not, in internal memory, delete the frame of pre-recording exceeding the frame number F that pre-records.
It should be noted that, the first preset value is determined according to memory size, port number and passage video recording maximal rate.
Further, in step s 102 described frame of pre-recording described in N number of formed a pre-recorded video group after, described method also comprises:
Create the key frame doubly linked list that described pre-recorded video group is corresponding, described key frame doubly linked list comprises the key frame information of this pre-recorded video group and the key frame information of next pre-recorded video group.
As one embodiment of the present of invention, for each pre-recorded video group, create the key frame doubly linked list that this pre-recorded video group is corresponding.Key frame doubly linked list comprises the key frame information of this pre-recorded video group and the key frame information of next pre-recorded video group.When the prerecorded data block in internal memory is writen to External memory equipment, according to key frame doubly linked list, make the frame (prerecorded data block comprises one or more pre-recorded video group) in units of prerecorded data block of pre-recording write out.By key frame doubly linked list, ensure that, when the prerecorded data block in internal memory is writen to External memory equipment, the first frame write out is key frame, last frame is the previous frame of next key frame, is minimumly write out unit, realizes seamless video recording with pre-recorded video group.
Fig. 2 shows the specific implementation flow chart described in video preprocessor recording method step S103 that the embodiment of the present invention provides, the prerecorded data block in described internal memory being writen to External memory equipment, with reference to Fig. 2:
In step s 201, the prerecorded data block in described internal memory is writen to first of described External memory equipment and pre-records in file, the described first file of pre-recording can write at most F and to pre-record frame;
In step S202, when described first pre-record file write full time, detect whether receive video recording instruction, if so, perform step S203; If not, step S204 is performed;
In step S203, the prerecorded data block that described first pre-records in file is writen in the video file of described External memory equipment, completes video and pre-record;
In step S204, the prerecorded data block in described internal memory is continued to be writen to second of described External memory equipment and pre-records in file, and delete described first and to pre-record existing prerecorded data block in file, the described second file of pre-recording can write at most F frame of pre-recording;
In step S205, when described second pre-record file write full time, detect whether receive described video recording instruction, if so, perform step S206; If not, step S207 is performed;
In step S206, the prerecorded data block that described second pre-records in file is writen in the described video file of described External memory equipment, completes video and pre-record;
In step S207, delete described second and to pre-record existing prerecorded data block in file, and return and perform step S201.
As one embodiment of the present of invention, when buffer memory of pre-recording adopts External memory equipment, create the first file and second of pre-recording and pre-record file in External memory equipment, the first file and second file of pre-recording of pre-recording can write all at most F frame of pre-recording.When the data block in internal memory is writen to External memory equipment, wheel flows to the first file and second of pre-recording and pre-records in file and write F frame of pre-recording.First pre-record file write full time, detect whether receive video recording instruction, if so, by first, the prerecorded data block of pre-recording in file is writen in the video file of External memory equipment, completes video and pre-records; If not, the prerecorded data block in internal memory is continued to be writen to second and pre-records in file, and delete first and to pre-record existing existing prerecorded data block of pre-recording in file.
Further, described deletion described first existing prerecorded data block in file of pre-recording is specially: when described second pre-record file write full time, delete described first and to pre-record existing prerecorded data block in file.
Identical with toward the first pre-record principle of writing prerecorded data block in file toward the second pre-record principle of writing prerecorded data block in file.Further, described deletion described second existing prerecorded data block in file of pre-recording is specially: when described first pre-record file write full time, delete described second and to pre-record existing prerecorded data block in file.
Further, after receiving described video recording instruction, described method also comprises:
By real-time recording frame write memory, N number of described real-time recording frame is formed a real-time recording image sets, M described real-time recording image sets is formed a real-time recording data block;
After arbitrary real-time recording data block composition in described internal memory, the real-time recording data block in described internal memory is writen in the described video file in described External memory equipment.
In embodiments of the present invention, after receiving video recording instruction, by real-time recording frame write memory, N number of real-time recording frame is formed a real-time recording image sets, M real-time recording image sets is formed a real-time recording data block.After arbitrary real-time recording data block composition in internal memory, be writen in the video file in External memory equipment by the real-time recording data block in internal memory, thus real-time recording frame is pressed block write External memory equipment, that improves External memory equipment writes throughput.
The embodiment of the present invention by using External memory equipment as buffer memory of pre-recording, make the time of pre-recording by the restriction of memory size, thus long pre-recording the time can be supported; To pre-record in advance frame write memory, N number of frame of pre-recording is formed a pre-recorded video group, M pre-recorded video group is formed a prerecorded data block, again the prerecorded data block in internal memory is writen to External memory equipment, frame of pre-recording thus writes External memory equipment by block, thus improve External memory equipment write throughput.
Fig. 3 shows the structured flowchart of the video preprocessor recording device that the embodiment of the present invention provides, and this device may be used for the video preprocessor recording method described in service chart 1 and Fig. 2.For convenience of explanation, illustrate only part related to the present embodiment.
With reference to Fig. 3, described device comprises:
Pre-record frame number determination module 31, for obtaining pre-record time and frame per second of pre-recording, pre-record according to acquisition time and frame per second of pre-recording determine the frame number F that pre-records, wherein, F be greater than 0 integer;
Prerecorded data block comprising modules 32, for frame write memory of pre-recording, frame of pre-recording described in N number of is formed a pre-recorded video group, M described pre-recorded video group is formed a prerecorded data block, wherein, first frame of described pre-recorded video group is key frame, N be greater than 1 integer, M be more than or equal to 1 integer;
To pre-record cache module 33, if be greater than the first preset value for the frame number F that pre-records described in determining, then, after the arbitrary prerecorded data block composition in described internal memory, the prerecorded data block in described internal memory is writen to External memory equipment.
Further, described device also comprises:
Key frame doubly linked list creation module 34, for creating key frame doubly linked list corresponding to described pre-recorded video group, described key frame doubly linked list comprises the key frame information of this pre-recorded video group and the key frame information of next pre-recorded video group.
Preferably, cache module 33 of pre-recording described in comprises:
First pre-records cache sub-module 331, pre-records in file for the prerecorded data block in described internal memory is writen to first of described External memory equipment, and the described first file of pre-recording can write at most F frame of pre-recording;
First video recording command detection submodule 332, for when described first pre-record file write full time, whether detection receives video recording instruction;
First prerecorded data block writes out submodule 333, if for receiving described video recording instruction, be then writen in the video file of described External memory equipment by the prerecorded data block that described first pre-records in file;
Second pre-records cache sub-module 334, if for not receiving described video recording instruction, then the prerecorded data block in described internal memory being continued to be writen to second of described External memory equipment pre-records in file, and delete described first and to pre-record existing prerecorded data block in file, the described second file of pre-recording can write at most F frame of pre-recording.
Preferably, cache module 33 of pre-recording described in also comprises:
Second video recording command detection submodule 335, for when described second pre-record file write full time, whether detection receives described video recording instruction;
Second prerecorded data block writes out submodule 336, if for receiving described video recording instruction, be then writen in the described video file of described External memory equipment by the prerecorded data block that described second pre-records in file;
Described first pre-record cache sub-module 331 also for:
If do not receive described video recording instruction, then the prerecorded data block in described internal memory is continued to be writen to described first and pre-record in file, and delete described second and to pre-record existing prerecorded data block in file.
Preferably, described device also comprises:
Real-time recording data block comprising modules 35, for by real-time recording frame write memory, forms a real-time recording image sets by N number of described real-time recording frame, and M described real-time recording image sets is formed a real-time recording data block;
Real-time recording data block writes out module 36, after the arbitrary real-time recording data block composition in described internal memory, the real-time recording data block in described internal memory is writen in the described video file in described External memory equipment.
The embodiment of the present invention by using External memory equipment as buffer memory of pre-recording, make the time of pre-recording by the restriction of memory size, thus long pre-recording the time can be supported; To pre-record in advance frame write memory, N number of frame of pre-recording is formed a pre-recorded video group, M pre-recorded video group is formed a prerecorded data block, again the prerecorded data block in internal memory is writen to External memory equipment, frame of pre-recording thus writes External memory equipment by block, thus improve External memory equipment write throughput.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a video preprocessor recording method, is characterized in that, comprising:
Acquisition is pre-recorded time and frame per second of pre-recording, and pre-record according to acquisition time and frame per second of pre-recording determine the frame number F that pre-records, wherein, F be greater than 0 integer;
To pre-record frame write memory, and frame of pre-recording described in N number of to be formed a pre-recorded video group, M described pre-recorded video group is formed a prerecorded data block, wherein, first frame of described pre-recorded video group is key frame, N be greater than 1 integer, M be more than or equal to 1 integer;
If pre-record described in determining, frame number F is greater than the first preset value, then, after the arbitrary prerecorded data block composition in described internal memory, the prerecorded data block in described internal memory is writen to External memory equipment.
2. the method for claim 1, is characterized in that, described frame of pre-recording described in N number of formed a pre-recorded video group after, described method also comprises:
Create the key frame doubly linked list that described pre-recorded video group is corresponding, described key frame doubly linked list comprises the key frame information of this pre-recorded video group and the key frame information of next pre-recorded video group.
3. the method for claim 1, is characterized in that, describedly prerecorded data block in described internal memory is writen to External memory equipment comprises:
Prerecorded data block in described internal memory is writen to first of described External memory equipment pre-records in file, and the described first file of pre-recording can write at most F and to pre-record frame;
When described first pre-record file write full time, detect whether receive video recording instruction;
If receive described video recording instruction, then the prerecorded data block that described first pre-records in file is writen in the video file of described External memory equipment;
If do not receive described video recording instruction, then the prerecorded data block in described internal memory being continued to be writen to second of described External memory equipment pre-records in file, and delete described first and to pre-record existing prerecorded data block in file, the described second file of pre-recording can write at most F frame of pre-recording.
4. method as claimed in claim 3, is characterized in that, to be writen to by the prerecorded data block in described internal memory after second of described External memory equipment pre-records in file described, described method also comprises:
When described second pre-record file write full time, detect whether receive described video recording instruction;
If receive described video recording instruction, then the prerecorded data block that described second pre-records in file is writen in the described video file of described External memory equipment;
If do not receive described video recording instruction, then the prerecorded data block in described internal memory is continued to be writen to described first and pre-record in file, and delete described second and to pre-record existing prerecorded data block in file.
5. the method as described in claim 3 or 4, is characterized in that, after receiving described video recording instruction, described method also comprises:
By real-time recording frame write memory, N number of described real-time recording frame is formed a real-time recording image sets, M described real-time recording image sets is formed a real-time recording data block;
After arbitrary real-time recording data block composition in described internal memory, the real-time recording data block in described internal memory is writen in the described video file in described External memory equipment.
6. a video preprocessor recording device, is characterized in that, comprising:
Pre-record frame number determination module, for obtaining pre-record time and frame per second of pre-recording, pre-record according to acquisition time and frame per second of pre-recording determine the frame number F that pre-records, wherein, F be greater than 0 integer;
Prerecorded data block comprising modules, for frame write memory of pre-recording, frame of pre-recording described in N number of is formed a pre-recorded video group, M described pre-recorded video group is formed a prerecorded data block, wherein, first frame of described pre-recorded video group is key frame, N be greater than 1 integer, M be more than or equal to 1 integer;
To pre-record cache module, if be greater than the first preset value for the frame number F that pre-records described in determining, then, after the arbitrary prerecorded data block composition in described internal memory, the prerecorded data block in described internal memory is writen to External memory equipment.
7. device as claimed in claim 6, it is characterized in that, described device also comprises:
Key frame doubly linked list creation module, for creating key frame doubly linked list corresponding to described pre-recorded video group, described key frame doubly linked list comprises the key frame information of this pre-recorded video group and the key frame information of next pre-recorded video group.
8. device as claimed in claim 6, is characterized in that, described in cache module of pre-recording comprise:
First pre-records cache sub-module, pre-records in file for the prerecorded data block in described internal memory is writen to first of described External memory equipment, and the described first file of pre-recording can write at most F frame of pre-recording;
First video recording command detection submodule, for when described first pre-record file write full time, whether detection receives video recording instruction;
First prerecorded data block writes out submodule, if for receiving described video recording instruction, be then writen in the video file of described External memory equipment by the prerecorded data block that described first pre-records in file;
Second pre-records cache sub-module, if for not receiving described video recording instruction, then the prerecorded data block in described internal memory being continued to be writen to second of described External memory equipment pre-records in file, and delete described first and to pre-record existing prerecorded data block in file, the described second file of pre-recording can write at most F frame of pre-recording.
9. device as claimed in claim 8, is characterized in that, described in cache module of pre-recording also comprise:
Second video recording command detection submodule, for when described second pre-record file write full time, whether detection receives described video recording instruction;
Second prerecorded data block writes out submodule, if for receiving described video recording instruction, be then writen in the described video file of described External memory equipment by the prerecorded data block that described second pre-records in file;
Described first pre-record cache sub-module also for:
If do not receive described video recording instruction, then the prerecorded data block in described internal memory is continued to be writen to described first and pre-record in file, and delete described second and to pre-record existing prerecorded data block in file.
10. device as claimed in claim 8 or 9, it is characterized in that, described device also comprises:
Real-time recording data block comprising modules, for by real-time recording frame write memory, forms a real-time recording image sets by N number of described real-time recording frame, and M described real-time recording image sets is formed a real-time recording data block;
Real-time recording data block writes out module, after the arbitrary real-time recording data block composition in described internal memory, the real-time recording data block in described internal memory is writen in the described video file in described External memory equipment.
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| CN107093436A (en) * | 2017-03-10 | 2017-08-25 | 青岛海信移动通信技术股份有限公司 | The storage method and device of the audio, video data pre-recorded, mobile terminal |
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