The Design And Implement Of SWF Decoder In Set Top Box

At the present stage, the Digital TV is being developed rapidly in the global range. Various kinds of research about the technology of the DTV are being studied in an all-round way. The DTV has enriched the content of the program, has improved the definition of the picture. Rich and colorful data broadcasting serves are developed gradually too. Meet the need of the DTV, the terminal of DTV—Set Top Box is developed towards the direction of the multimedia application platform. People are no longer satisfied with passive watching TV for information, but have higher demands for the interactive serves of broadband. SWF is a popular interactive vector file format of multimedia on Internet, usually called Flash too. The webpage based on SWF technology has realized rich and colorful interactive application, and elegant in appearance. SWF technology is open and ripe now, available resources are quite abundant, very suitable for transplanting to the DTV field. SWF will realize the enormous evolution of user's interface and operation mode of STB, promote the development of the interactive serves of the DTV. For the reason, the practical digital STB SWF decoder was designed and realized in this paper, focal point and difficult point of the decoder was analysed. The development of the whole system adopts standard ANSI-C language, based on the international standard to generally using at present. Decoder is an interchangeable independent decode system, not involving the specific STB hardware or operating system. SWF data compressed transport based on DVB standard was also designed in this paper. Cooperated with SWF decoder, they can realize the interactive application of various kinds of SWF on STB of the DTV. From technology point and applicable prospect, using of SWF in embedded browser Flash plug-in, STB's GUI customizing and Interactive TV Middleware was analysed in this paper. There also provided the concrete technological detail and implement scheme. SWF technology has very great potentiality of using in the field of DTV. When carry on further development, its research direction in the future is to combine DTV standard and charge mode.