【摘要】 该文介绍了Bt848卡的主要结构和工作原理,并详细描述了集成到可以实现上网和多媒体通信双重功能的IS-DN卡上的Bt848芯片驱动程序的实现,包括分配DMA内存区,分配视频缓冲区,以及视频数据在芯片和PC机内存之间的流动过程,并给出了具体的实现方法。更多还原

【Abstract】 In this paper,the architecture and character of Bt848are analyzed,and the core technology of implementing the driver of Bt848video capture,which is integrated in an ISDN adapter card with two functions of browsing the In-ternet and multimedia communication is discussed.Some techniques employed such as allocating DMA memory,allotting video buffer and sharing the video data between the Bt848chip and computer memory are described in detail.Finally the implementation of WDM driver is presented.更多还原