Audio/video data access method and device based on raw device

A data access, audio and video technology, applied in data recording, electrical digital data processing, special data processing applications, etc., can solve the problems of packet and packet loss, easy damage of allocation table, different sizes of new and old files, etc., to achieve good results Space reclamation strategy and segmentation strategy, ensuring data security, and extending the service life

Inactive Publication Date: 2007-08-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is easy to cause frame loss between packets. At the same time, the hard disk head needs to read and write data and file indexes frequently, and the head jumps frequently, which is very easy to cause hard disk failure.
At the same time, after the hard disk is full, the entire file needs to be deleted, but the size of the new and old files is different, which will generate a lot of fragmented space on the hard disk, affecting the use of the hard disk and system efficiency.
In addition, the file allocation table of the FAT file system is easily damaged, which may easily cause the loss of video data

Method used

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  • Audio/video data access method and device based on raw device
  • Audio/video data access method and device based on raw device
  • Audio/video data access method and device based on raw device

Examples

Experimental program
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Embodiment Construction

[0038] As shown in Figure 1, a device for accessing audio and video data based on bare equipment includes:

[0039] Audio and video data operation interface 110, for providing the interface of audio and video data reading and writing operation to embedded digital audio and video system;

[0040] An index generator 120, configured to generate index information according to data attributes;

[0041] Audio-video data converter 160, is used for carrying out format conversion to audio-video data, and adds identification mark and time stamp to every packet of data;

[0042] The block operation manager 130 is used to allocate, divide and reclaim the disk space of the physical disk 150, calculate the conversion between the block position and the disk position, and maintain the block buffer;

[0043] The disk manager 140 is used to perform unbuffered direct read and write operations on the physical disk 150 at a specified location;

[0044] The allocation manager 170 is used to provi...

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PUM

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Abstract

This invention discloses one audio frequency data memory method based on bare device, which comprises the following steps: aligning magnetic disc space into several blocks and designing each with certain number and storing the blocks into each disc space block for operations in writing or reading data. This invention has property for lossless data to keep data in electricity break.

Description

technical field [0001] The present invention relates to the technical field of digital audio and video and data storage, and specifically refers to an audio and video data access method and device based on bare equipment on an embedded system. Background technique [0002] Embedded digital audio and video systems, like PCs, have hard disk file systems. The hard disk file system of the embedded digital audio and video system can be divided into two categories, one is the same file system as the PC, and the second is a special file system specially developed for special storage purposes. [0003] At present, there are many types of file systems used in embedded digital audio and video systems, such as MS-DOS compatible file systems, UNIX compatible file systems, and Windows compatible file systems. [0004] The FAT file system used by the PC system cannot manage large data packets (several gigabytes to tens of gigabytes of data) generated by long-term audio and video data rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/06G06F17/30G11B20/12G11B27/00
Inventor 陈耀武曲琳
Owner ZHEJIANG UNIV
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