diff fft.h @ 1:6422640a802f

first upload

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fft.h	Tue Oct 05 10:45:57 2010 +0100
@@ -0,0 +1,82 @@
+#ifndef fftH
+#define fftH
+
+/*
+  fft.cpp - fast Fourier and cosine transforms
+
+  Arguments of the function in this unit roughly follow the following rules:
+    Wid   : size of transform
+    Order : log2(Wid)
+    W     : FFT buffer: twiddle factors, standard size Wid/2
+    X     : FFT buffer: data buffer, standard size Wid
+    bitinv: FFT buffer: table of bit-inversed integers, standard size Wid
+    Window: window function, standard size Wid
+    spec  : complex spectrogram
+    Amp   : amplitude spectrogram
+    Arg   : phase spectrogram
+    prefix h- : half-size
+    prefix q- : quarter-size
+*/
+
+
+#include <math.h>
+#include "xcomplex.h"
+#include "align8.h"
+
+//---------------------------------------------------------------------------
+/*
+  macro AllocateFFTBuffer: allocates FFT buffers X and W of given length with an extra LDATA buffer the
+  right size for hosting such arrays as the standard-size window function or output amplitude spectrum.
+
+  This macro allocates buffer with 64-bit alignment, which must be freed with free8() or FreeFFTBuffer
+  macro.
+*/
+#define AllocateFFTBuffer(_WID, _LDATA, _W, _X) \
+  double *_LDATA=(double*)malloc8(sizeof(double)*_WID*4); \
+  cdouble *_X=(cdouble*)&_LDATA[_WID]; \
+  cdouble *_W=(cdouble*)&_X[_WID]; \
+  SetTwiddleFactors(_WID, _W);
+#define FreeFFTBuffer(_LDATA) free8(_LDATA);
+
+//--compelx FFT and IFFT-----------------------------------------------------
+void CFFTCbii(int Order, cdouble* W, cdouble* X); //complex FFT subroutine after bit-inversed ordering
+void CFFTC(int Order, cdouble* W, cdouble* X, int* bitinv=0); //complex FFT, compact in-place
+void CFFTC(cdouble* Input, double* Amp, double *Arg, int Order, cdouble* W, cdouble* X, int* bitinv=0); //complex FFT
+void CFFTCW(double* Window, int Order, cdouble* W, cdouble* X, int* bitinv=0);  //complex FFT with window, compact in-place
+void CFFTCW(cdouble* Input, double* Window, double *Amp, double *Arg, int Order, cdouble* W, cdouble* X, int* bitinv=0);  //complex FFT with window
+void CIFFTC(int Order, cdouble* W, cdouble* X, int* bitinv=0);  //complex IFFT, compact in-place
+void CIFFTC(cdouble* Input, int Order, cdouble* W, cdouble* X, int* bitinv=0);  //complex IFFT
+
+//--real FFT and IFFT--------------------------------------------------------
+void RFFTC_ual(double* Input, double* Amp, double* Arg, int Order, cdouble* W, cdouble* X, int* hbitinv=0); //real-to-complex FFT
+void RFFTC_ual_old(double* Input, double *Amp, double *Arg, int Order, cdouble* W, double* XR, double* XI, int* bitinv=0);  //depreciated
+void RFFTCW(double* Input, double* Window, double *Amp, double *Arg, int Order, cdouble* W, cdouble* X, int* hbitinv=0);  //real-to-complex FFT with window, double-type input
+void RFFTCW(__int16* Input, double* Window, double *Amp, double *Arg, int Order, cdouble* W, cdouble* X, int* hbitinv=0); //real-to-complex FFT with window, __int16 input
+void CIFFTR(cdouble* Input, int Order, cdouble* W, double* X, int* hbitinv=0);  //complex-to-real IFFT
+
+/*
+  macro RFFTC: was defined as RFFTC_ual (literally "unaligned RFFTC") enveloped by ALIGN8(). However, as
+  ALIGN8() is currently disabled for lack of compiler support, RFFTC is equivalent to RFFTC_ual.
+*/
+#define RFFTC(Input, Amp, Arg, Order, W, X, hbitinv) RFFTC_ual(Input, Amp, Arg, Order, W, X, hbitinv);
+
+//--MFT----------------------------------------------------------------------
+void CMFTC(double* xR, double* xI, int Order, cdouble** X, cdouble* W); //complex fast multiresolution FT
+
+//--DCT and IDCT-------------------------------------------------------------
+void RDCT1(double* Input, double* Output, int Order, cdouble* qW, cdouble* qX, int* qbitinv=0);   //DCT1
+void RDCT4(double* Input, double* Output, int Order, cdouble* hW, cdouble* hX, int* hbitinv=0);   //DCT4
+void RIDCT1(double* Input, double* Output, int Order, cdouble* qW, cdouble* qX, int* qbitinv=0);  //IDCT1
+void RIDCT4(double* Input, double* Output, int Order, cdouble* hW, cdouble* hX, int* hbitinv=0);  //IDCT4
+
+//--LCT----------------------------------------------------------------------
+void RLCT(double** spec, double* data, int Count, int Order, int wid, double* g); //local cosine transform
+void RILCT(double* data, double** spec, int Fr, int Order, int wid, double* g);   //inverse local cosine transform
+
+//--tools--------------------------------------------------------------------
+double Atan2(double, double);
+int* CreateBitInvTable(int Order);  //creates table of bit-inversed integers
+void SetTwiddleFactors(int N, cdouble* w);  //set twiddle factors
+
+
+#endif