System To Receive Dvb-based Broadband Network Software Design And Implementation

The application of DVB system which started with satellite living broadcast system was adoptted by CATV gradually. By the growing up of Internet, DVB system based on llnternet became the research object of researchers and engineers. However, narrow band and high error rate of Internet limited the application of DVB system which should transport lots of data on network. Nowadays high-speed broadband network of CATV is used to realize DVB system whose client is personal computer. We developed the client software of this DVB system which was based on windows platform. The hardware used in client is a DVI3 receive card and the archecture of the receive card driver is NDIS which makes the driver can be migrated in different windows platforms easily. The application software part is based on filter structure in Directshow and we developed a source filter through which ~ve can control the playing back of the mediaplayer. By our test, the DVB receive system can play back the MPEG-2 and MPEG-I vedio and download files. The softe-vare part of the DVB receiving system has following advantages. 1) The design of driver based on NDIS make it easy that the software can be migrated in different windows platforms without too much modification. 2) Multi-level buffer is used to resolve the problem of slow play and packet re-assemble. The system use one buffer in kernel mode and one buffer in user mode which makes the movie can be played frequently when there is any speed difference between sending and receiving. 3) Multi-level software module is used which makes the system can be updated and modified easily. For example, miniport dirver answers for the communication to receiving card and the receiption of TS packet without re-assembling the TS packet to PS packet. So if a new kind of media type is demanded in this system, the miniport driver part of the system should not be aniniended. 4) MediaPlayer and IE are the most popular software built in windows operating system. So the software using these tools are friendly to users.