xawtv绝版源码，适合初学v4l编程者-xawtv out-of-print source, suitable for novice programmers v4l

基于XILINX ISE下的数字上变频设计，其中用到了XILINX的乘法IP。已经通过工程实用，好用。-XILINX ISE based on frequency of figure design, use one of the XILINX multiplication IP. Has passed the project practical, easy to use.