CN109874049A - A method of video frame reading speed is extracted in optimization - Google Patents
A method of video frame reading speed is extracted in optimization Download PDFInfo
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- CN109874049A CN109874049A CN201910060936.6A CN201910060936A CN109874049A CN 109874049 A CN109874049 A CN 109874049A CN 201910060936 A CN201910060936 A CN 201910060936A CN 109874049 A CN109874049 A CN 109874049A
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Abstract
Disclosed by the invention is a kind of method that video frame reading speed is extracted in optimization, including storing step, read step, storing step is that video file downloading is stored in embedded fat32 file system, read step is to read the video data of each frame, reading video requency frame data using the method for the present invention may be implemented several frames enhancing in one second from the prior art to one second frame up to a hundred, to guarantee that video frame read stablizes high frame per second；It will not influence video playing frame per second, improve the reading speed of video frame, to guarantee video playing frame per second.
Description
Technical field
The present invention relates to a kind of methods of reading speed, more specifically say, are related to a kind of optimization extraction video frame reading
The method of speed belongs to embedded video and plays field.
Background technique
In embedded systems play be stored in fat32 file system video file when read video file have with
Under several steps:
1) format for, analyzing video file, according to specific format determine video frame be located at the specific location of video file with
Length；
2) position, got according to back and length read video frame to fat32 file system requests；
3), Fat32 file system obtains the corresponding cluster number in position of previous step request according to the fat sheet format of itself, and
Cluster number is converted to final hardware address；
4), the hardware address obtained according to previous step initiates multiple read request to hardware；
5), hardware returns to video requency frame data and uses to program；
When playing video in order to reach certain frame per second, before playing previous frame, the data of next frame are had to
It is ready to, the speed for then reading video frame is particularly critical, but due to itself storage characteristics of fat32 file system, the following
The reading speed of serious limitation video frame, that is, the problem of presence:
1), as shown in Figure 1, in order to determine that the position of each video frame is necessarily required to repeatedly read fat table, by document misregistration
Be converted to cluster number；
2), as shown in Figure 1, fat32 file system is using cluster as storage cell, the data length of a video frame has and has greatly
It is small, if frame crosses over several clusters, it is possible to which need repeatedly to read fat table just can determine that the corresponding cluster of all video frames
Position；
3) it, repeatedly requests read operation speed that can greatly increase protocol overhead to hardware, and then influences speed.
Due to the presence of the above Railway Project, it is likely that video data reading efficiency can be seriously affected and broadcast to influence video
Frame per second is put, when being shown if it is multichannel local video, is influenced even more serious.
Summary of the invention
In order to solve above-mentioned prior art problem, the present invention, which provides to have, can be improved the technologies such as local video frame reading speed
The method that video frame reading speed is extracted in a kind of optimization of feature.
To achieve the goals above, the present invention is achieved by the following technical solutions:
A method of video frame reading speed is extracted in optimization, and this method includes storing step, read step, the storage
Step is that video file downloading is stored in embedded fat32 file system comprising following steps:
Step 1): formatted storage medium is fat32 file system, and specified cluster size can be large enough to hold each frame video
The limitation of every one-frame video data is stored in cluster by data；
Step 2): in one fat32 file system to embedded system of transplanting；
Step 3): upper computer software parsing video format file is write, obtains the video data of each frame, and requesting will be every
The video data of one frame is sent to embedded system；
Step 4): local built-in system software is write for receiving the request of upper computer software, receives upper computer software
Video data request is sent, and creates a videogram under the root directory for each new video files；
Step 5): receiving the video data of each frame of host computer, and is the video data of each frame in corresponding video
A file is created under catalogue, and video file name is named with frame number, obtains several video frame files；
The read step is to read the video data of each frame comprising following steps:
Step 1): obtaining the cluster number of root, and the first cluster of the root is close to FAT2, the area Zhan Cu sequentially the 1st
Cluster；
Step 2): reading the data of the corresponding cluster of root, and reads video file name as needed, finds corresponding mesh
Item is recorded, the corresponding cluster number of the directory entry is found with this；The data of cluster are the file entry of each video frame file, are recorded in the middle
Each video frame file corresponding cluster position；
Step 3): the corresponding cluster of the directory entry is read；
Step 4): corresponding file entry in cluster is successively indexed according to the frame number of video file name, is found respectively each
The corresponding file entry of frame video data；
Step 5): the corresponding cluster number of video frame file and cluster length are found according to the file entry of every one-frame video data；
Step 6): being the address and length that hardware needs by cluster number and cluster length transition；
Step 7): according to the cluster number and length of acquisition, hardware read command is initiated；
Step 8): hardware returns to video requency frame data.
As an improvement short file entry length is all fixed as 4 bytes, the frame number of video file name is since 0
It is named and is sorted with natural positive integer.
Enhance the utility model has the advantages that reading video requency frame data using the method for the present invention and one second several frame from the prior art may be implemented
To one second frame up to a hundred, thus guarantee video frame read stablize high frame per second；It will not influence video playing frame per second, improve video frame
Reading speed, to guarantee video playing frame per second.
Detailed description of the invention
Fig. 1 is to need to find lower cluster schematic diagram in the prior art.
Fig. 2 is video frame file index cluster schematic diagram in the present invention.
Fig. 3 is video frame file under videogram in the embodiment of the present invention 1.
Specific embodiment
Below in conjunction with Figure of description, the invention will be further described, but the invention is not limited to following embodiments.
Embodiment 1
A kind of specific embodiment for being as Figure 2-3, method that video frame reading speed is extracted in optimization of the embodiment, should
Method includes storing step, read step, and the storing step is that video file downloading is stored in embedded fat32 file system
In system comprising following steps:
Step 1): formatted storage medium (such as CF card) is fat32 file system, and specified cluster size can be large enough to hold
The limitation of every one-frame video data is stored in cluster by every one-frame video data；
Step 2): in one fat32 file system to embedded system of transplanting；Embedded system be completely embedded into it is controlled
Device inside, the dedicated computer system designed for specific application, the core of embedded system are by one or several preparatory
Programming it is good be used to execute several tasks microprocessor or singlechip group at.User can be run with general purpose computer
The software of selection is different, and the software in embedded system is usually temporarily constant, so being frequently referred to as firmware；
Step 3): upper computer software parsing video format file is write, obtains the video data of each frame, and requesting will be every
The video data of one frame is sent to embedded system；Upper computer software is mounted in the software in computer, be used to and slave computer into
Row communication, control or the data for reading slave computer；
Step 4): local built-in system software is write for receiving the request of upper computer software, receives upper computer software
Video data request is sent, and creates a videogram under the root directory for each new video files；
Step 5): receiving the video data of each frame of host computer, and is the video data of each frame in corresponding video
A file is created under catalogue, video file name is named with frame number, as shown in figure 3, directory name is video, includes under catalogue
Frame0, frame1, rame2, frame3, rame4, frame5, rame6, frame7 video frame file；
The read step is to read the video data of each frame comprising following steps:
Step 1): obtaining the cluster number of root, and the first cluster of the root is close to FAT2, the area Zhan Cu sequentially the 1st
Cluster；
Step 2): reading the data of the corresponding cluster of root, and reads video file name as needed, finds corresponding mesh
Item is recorded, the corresponding cluster number of the directory entry is found with this；The data of cluster are the file entry of each video frame file, are recorded in the middle
Each video frame file corresponding cluster position；Since catalogue is placed under root, the position of the cluster of root is fixed
, so obtaining very fast according to directory entry position each in root cluster；As shown in Fig. 2, according to video frame filename rope
File entry is guided to so that it is determined that the corresponding cluster position of video frame, short essay part list length all fixes 4 bytes, according to video file
The frame number 0 of name, 1,2, x, so that it may the position of file entry is determined according to formula 4*x；
Step 3): the corresponding cluster of the directory entry is read；
Step 4): corresponding file entry in cluster is successively indexed according to the frame number of video file name, is found respectively each
The corresponding file entry of frame video data；As shown in Fig. 2, such as corresponding first file entry 1 of frame0, frame1 corresponding second
A file entry 2, each short file entry are 4 bytes；
Step 5): the corresponding cluster number of video frame file and cluster length are found according to the file entry of every one-frame video data；
Step 6): being the address and length that hardware needs by cluster number and cluster length transition；
Step 7): according to the cluster number and length of acquisition, hardware read command is initiated；
Step 8): hardware returns to video requency frame data.
Finally it should be noted that present invention is not limited to the above embodiments, there can also be many variations.This field it is general
All deformations that logical technical staff directly can export or associate from present disclosure, are considered as of the invention
Protection scope.
Claims (2)
1. a kind of method that video frame reading speed is extracted in optimization, it is characterised in that this method includes storing step, read step,
The storing step is that video file downloading is stored in embedded fat32 file system comprising following steps:
Step 1): formatted storage medium is fat32 file system, and specified cluster size can be large enough to hold each frame video counts
According to, by every one-frame video data limitation be stored in cluster；
Step 2): in one fat32 file system to embedded system of transplanting；
Step 3): upper computer software parsing video format file is write, obtains the video data of each frame, and request each frame
Video data send to embedded system；
Step 4): local built-in system software is write for receiving the request of upper computer software, upper computer software is received and sends
Video data request, and a videogram is created under the root directory for each new video files；
Step 5): receiving the video data of each frame of host computer, and is the video data of each frame in corresponding videogram
One file of lower creation names video file name with frame number, obtains several video frame files；
The read step is to read the video data of each frame comprising following steps:
Step 1): obtaining the cluster number of root, and the first cluster of the root is close to FAT2, the 1st cluster of the area Zhan Cu sequentially；
Step 2): reading the data of the corresponding cluster of root, and reads video file name as needed, finds corresponding catalogue
, the corresponding cluster number of the directory entry is found with this；The data of cluster are the file entry of each video frame file, are had recorded in the middle
The corresponding cluster position of each video frame file；
Step 3): the corresponding cluster of the directory entry is read；
Step 4): successively indexing corresponding file entry in cluster according to the frame number of video file name, finds each frame view respectively
Frequency is according to corresponding file entry；
Step 5): the corresponding cluster number of video frame file and cluster length are found according to the file entry of every one-frame video data；
Step 6): being the address and length that hardware needs by cluster number and cluster length transition；
Step 7): according to the cluster number and length of acquisition, hardware read command is initiated；
Step 8): hardware returns to video requency frame data.
2. the method that video frame reading speed is extracted in a kind of optimization according to claim 1, it is characterised in that: short file
List length is all fixed as 4 bytes, and the frame number of video file name is to name to sort with natural positive integer since 0.
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| CN1522534A (en) * | 2001-07-04 | 2004-08-18 | ������������ʽ���� | Image recording equipment |
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Denomination of invention: A Method of Optimizing the Reading Speed of Video Frames Effective date of registration: 20221109 Granted publication date: 20210427 Pledgee: Zhejiang Fuyang Rural Commercial Bank branch Limited by Share Ltd. Silver Lake Pledgor: Hangzhou xiongmai integrated circuit technology Co.,Ltd. Registration number: Y2022980021287 |
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Address after: 311422 4th floor, building 9, Yinhu innovation center, 9 Fuxian Road, Yinhu street, Fuyang District, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Xinmai Microelectronics Co.,Ltd. Address before: 311400 4th floor, building 9, Yinhu innovation center, No.9 Fuxian Road, Yinhu street, Fuyang District, Hangzhou City, Zhejiang Province Patentee before: Hangzhou xiongmai integrated circuit technology Co.,Ltd. |
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