Embedded Multimedia Remote Monitoring System, Real-time Decoding Mpeg-1 Playback Component Design

Having the features of reflecting the object being monitored and controlled vividly and truly in real time,multimedia surveillance system is becoming one of the important means of modernization management, monitoring and control. Comparing to traditional multimedia surveillance system, the embedded remote multimedia system has the characteristics of small volume, low cost, high stability and etc, so it has good applied and developmental outlook. Therefore it has great significance to research and develop an embedded remote multimedia system.In embedded remote multimedia surveillance system, whether the multimedia data can be decoded and played back stably, reliably and high efficiently is one of the key factors which affect the system's performance. The task of this research is to design and achive a component used in embedded remote multimedia system ,which perform to decode and playback MPEG-1 data with high efficience.This thesis begins with brief introduction of the current developing status of multimedia surveillance system, the background under which the project was brought forward ,and the task of this research-Then it introduces the comprehensive design of the component and then in particular discusses the software design of the modules of the component. To improve maintain ability, this thesis adopted object oriented design method, the modules of the component is designed and realized in independent classes, which makes the program clear and easy to maintain. In the audio and video decode modules, to improve the decoding efficiency, this thesis uses MMX and SSE instructions to realize the core algorithms. In the video display module, to improve the display speed, it uses DirectDraw SDK and operates the display memory directly. In addition this thesis introduces the method adopted to encapsulate the whole component. In the end of the thesis, conclusions and evaluations are given about the structure and performance of the component. A prospect for the further developing is also suggested.