File reading method and device

Abstract

The invention provides a file reading method and device. The file reading method comprises that a sender segments files required to be transmitted to data blocks in fixed size, marks every data block through serial numbers and time stamps and packages the data blocks to a UDT (User Defined Type) data package; a terminal performs statics on the loss rate of the data package and detects the current available bandwidth; the loss rate of the data package is fed back to the sender in the predetermined cycle to adjust the sending speed; the terminal feeds back lost data to the sender and the sender resends when every transmission cycle is achieved. The file reading method can improve the file reading speed and meanwhile reduce consumption of system resources under the limit of the terminal processing capability.

Description

Technical field [0001] The invention relates to a file reading method, in particular to a video file reading method of an embedded system. Background technique [0002] With the rapid development of intelligent transportation systems, large-capacity video surveillance content has increased exponentially, and there is an increasing demand for access to the network through embedded terminals to obtain and view surveillance. Compared with the way of downloading and playing, download first and then play Although the playback response time is longer, the playback process is not affected by network factors such as bandwidth and delay, and it can better support VCR operations, so it is still an indispensable playback method. However, video The file size grows too fast. Take a video file compressed in the MPEG2TS format as an example, a 10-minute high-definition video is usually above 1GB. How to transfer high-definition video files from the server to the embedded terminal in the shorte...

AI Technical Summary

Problems solved by technology

However, most of these solutions are suitable for file transfer between ordinary computers. Due to the limited resources of embedded video terminals and weak network processing capabilities, the bottleneck of file transfer for embedded terminals is not only due to traditional factors such as network bandwidth, but also to strong sending terminals. The mismatch between the sending capability and the limited receiving capability of the receiving end is also an important factor affecting the file transfer speed

[0004] Therefore, for the above-mentioned problems existing in related technologies, effective solutions have not yet been proposed

Images