基于ARM处理器的基4和基5的FFT算法标准C程序，作者是JDB。-Base on ARM processor about Radix 4/5 FFT routines supporting 16/64/256 and 20/80 calculations. The source originally contributed by JDB

FFT implementation OggSquish, minus cosine transforms, minus all but radix 2 4 case. In Vorbis we only need this cut-down version. -FFT implementation OggSquish, minus cosine transforms, minus all but radix 2 4 case. In Vorbis we only need this cu