linux下的简单音频播放软件，支持wav等基本格式，代码很小，适合移植到嵌入式设备使用-linux under the simple audio player software, and other basic support wav format, the code is very small, suitable for transplant to the use of embedded devices

fft的快速实现，核心部分无任何耗时的sin,cos运算，所需要的数据初始化时全部已经计算好了。并且提供了fft的定点代码（这是很多fft不具有的），可以方便地移植到嵌入式和DSP环境-fft of rapid implementation, the core portion without any time-consuming sin cos operation, the initialization of the data needed all been calculated. And pr