/*CUDA*/
#include <cutil_inline.h>    // includes cuda.h and cuda_runtime_api.h
#include <device_launch_parameters.h>   //blockDim, blockIdx, threadIdx...

#define BLOCKDIM_X 512

#define PI 3.1416

void DFT_GPU(float *Dst_real_dev,float *Dst_imag_dev,float *signal_real_dev,float *signal_imag_dev,int N_DFT,int dir,dim3 grid,dim3 threads);