Design And Implementation Of Audio And Video System Of Portable Multimedia Player

The demand for entertainment products is rapidly growing, consumers desire to have a gadget which is able to display images in slideshow, enjoy favorite collection of music, and watch the recorded video clips wherever they are. The Portable Multimedia Player (PMP) gadget gradually grows to be the mainstream of the mobile entertainment. After analyzing the current market trend and the various complete solutions for the PMP gadget, it draws a conclusion that Intel XScale PXA270 is the prevalent hardware development platform and Microsoft Windows CE is the software development platform.The key design of the PMP product is the audio and video system design technology. By referring to the Intel reference design, the hardware development platform builds upon the fundamental construction of audio and video system. It mainly consists of the CPU modules, the LCD display modules and the extended functioning modules. Furthermore, Windows CE, the embedded operation system for business, provides a complete software solution for developing the next stunning consumer electronic products. It highlights the stability and efficiency of consumer electronic products. Driver design become the key point of the product design. It implements such platform drivers as LCD panel manipulation, audio codec, streaming and others based on customized platform. This embedded operating system encapsulates the data from the upper layer into the lower layer. Subsequently, it eases to develop a standard interface for the different layers in adding features/functionalities.Windows CE provides a rich set of programming tools based on its GUI System. This application programming interface (APIs) gives the flexibility to write simple user interface faster. Media player is the essential part of the product application. Through the analysis, Microsoft DirectShow provides the foundation for multimedia services on Windows CE. By using DirectShow, it is easy to provide the user with a rich multimedia experience. It offers the services for playback of multimedia streaming, applications control filter graph activities and other customized applications such as photo viewer, system setup and so on. The result of the functional testing has shown that the major functionalities of the audio and video system have successfully applied. In allusion to the Intel platform of the performance testing, it has pointed out the bottleneck. This result indicates the future direction to improve the performance.