Time-bitmap-based audio/video data access method

Abstract

The invention discloses a time-bitmap-based audio / video data access method, which comprises the following steps: dividing disk space into an index area and a data area in advance, wherein the index area is used for storing time-bitmap indexes and primary indexes, and each data bit in the time-bitmap index corresponds to one primary index respectively; and dividing the data area into a plurality of blocks, wherein each block corresponds to one secondary index. The audio / video data access procedures comprise writing of videotape sections, searching of videotape sections and reading of videotape sections. The method, disclosed by the invention, is applicable to large-capacity storage equipment, can eliminate space debris generated during the storage process, prevents the stored data from being lost in abnormal power failure, at the same time, reads data according to blocks, and is favorable for prolonging service life of the disk.

Description

technical field [0001] The invention relates to the field of audio and video data storage, in particular to an audio and video data access method based on a time bitmap. Background technique [0002] Like a PC, a video surveillance system has a hard disk file system for saving audio and video recordings. The hard disk file system of a video surveillance system can be divided into one category. The first category is the same general file system as a PC. The second category It is a dedicated file system specially developed for a specific storage purpose. [0003] In the video surveillance system, when using the arming plan (the arming time can range from a few minutes to a few days, or around the clock) to record, a large amount of data (several GB to tens of GB, or even terabytes) will be generated; When audio and video recording is triggered, due to the short time (alarm time can be several seconds or several minutes), relatively small data (hundreds of KB to tens of MB) ar...

AI Technical Summary

Problems solved by technology

In addition, in the outdoor video surveillance system, the monitoring equipment is easily affected by the external environment such as weather, and the monitoring equipment is often suddenly powered off

[0005] In the file system used by PCs, one data packet corresponds to one file. When super large files and small files are mixed and stored, a large amount of fragmented space will be generated on the hard disk during the recovery process of hard disk space, which will affect the use efficiency of the hard disk and reduce the system capacity. performance, and in the process of saving large files, it is necessary to read and write data and file indexes frequently, and the head jumps frequently, which is very easy to cause hard disk failure. In addition, if the power is suddenly cut off during the file writing process, the index It is easy to be in an inconsistent state, resulting in the loss of file content or the entire file, or even the entire file system cannot be used, resulting in data loss

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