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Code Issues Releases Wiki Activity

Code cleanup: Changed a few pointers to const pointers in FFT code

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This commit is contained in:
Raphaël Marinier 2016-06-25 20:36:00 +02:00
parent 6ac68db5be
commit 3120fa361e
4 changed files with 22 additions and 18 deletions
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10
src/FFT.cpp
View File

@ -137,7 +137,8 @@ inline int FastReverseBits(int i, int NumBits)
void FFT(int NumSamples,
bool InverseTransform,
float *RealIn, float *ImagIn, float *RealOut, float *ImagOut)
const float *RealIn, const float *ImagIn,
float *RealOut, float *ImagOut)
{
int NumBits; /* Number of bits needed to store indices */
int i, j, k, n;
@ -236,7 +237,7 @@ void FFT(int NumSamples,
* This is merely a wrapper of RealFFTf() from RealFFTf.h.
*/
void RealFFT(int NumSamples, float *RealIn, float *RealOut, float *ImagOut)
void RealFFT(int NumSamples, const float *RealIn, float *RealOut, float *ImagOut)
{
int i;
HFFT hFFT = GetFFT(NumSamples);
@ -277,7 +278,8 @@ void RealFFT(int NumSamples, float *RealIn, float *RealOut, float *ImagOut)
*
* This is merely a wrapper of InverseRealFFTf() from RealFFTf.h.
*/
void InverseRealFFT(int NumSamples, float *RealIn, float *ImagIn, float *RealOut)
void InverseRealFFT(int NumSamples, const float *RealIn, const float *ImagIn,
float *RealOut)
{
int i;
HFFT hFFT = GetFFT(NumSamples);
@ -316,7 +318,7 @@ void InverseRealFFT(int NumSamples, float *RealIn, float *ImagIn, float *RealOut
* of its code.
*/
void PowerSpectrum(int NumSamples, float *In, float *Out)
void PowerSpectrum(int NumSamples, const float *In, float *Out)
{
int i;
HFFT hFFT = GetFFT(NumSamples);

8
src/FFT.h
View File

@ -61,7 +61,7 @@
* input array, and that NumSamples must be a power of two.
*/
void PowerSpectrum(int NumSamples, float *In, float *Out);
void PowerSpectrum(int NumSamples, const float *In, float *Out);
/*
* Computes an FFT when the input data is real but you still
@ -71,7 +71,7 @@ void PowerSpectrum(int NumSamples, float *In, float *Out);
*/
void RealFFT(int NumSamples,
float *RealIn, float *RealOut, float *ImagOut);
const float *RealIn, float *RealOut, float *ImagOut);
/*
* Computes an Inverse FFT when the input data is conjugate symmetric
@ -79,7 +79,7 @@ void RealFFT(int NumSamples,
* two.
*/
void InverseRealFFT(int NumSamples,
float *RealIn, float *ImagIn, float *RealOut);
const float *RealIn, const float *ImagIn, float *RealOut);
/*
* Computes a FFT of complex input and returns complex output.
@ -89,7 +89,7 @@ void InverseRealFFT(int NumSamples,
void FFT(int NumSamples,
bool InverseTransform,
float *RealIn, float *ImagIn, float *RealOut, float *ImagOut);
const float *RealIn, const float *ImagIn, float *RealOut, float *ImagOut);
/*
* Multiply values in data by values of the chosen function

17
src/RealFFTf.cpp
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@ -191,9 +191,9 @@ void CleanupFFT()
void RealFFTf(fft_type *buffer,HFFT h)
{
fft_type *A,*B;
fft_type *sptr;
fft_type *endptr1,*endptr2;
int *br1,*br2;
const fft_type *sptr;
const fft_type *endptr1,*endptr2;
const int *br1,*br2;
fft_type HRplus,HRminus,HIplus,HIminus;
fft_type v1,v2,sin,cos;
@ -293,9 +293,9 @@ void RealFFTf(fft_type *buffer,HFFT h)
void InverseRealFFTf(fft_type *buffer,HFFT h)
{
fft_type *A,*B;
fft_type *sptr;
fft_type *endptr1,*endptr2;
int *br1;
const fft_type *sptr;
const fft_type *endptr1,*endptr2;
const int *br1;
fft_type HRplus,HRminus,HIplus,HIminus;
fft_type v1,v2,sin,cos;
@ -373,7 +373,8 @@ void InverseRealFFTf(fft_type *buffer,HFFT h)
}
}
void ReorderToFreq(HFFT hFFT, fft_type *buffer, fft_type *RealOut, fft_type *ImagOut)
void ReorderToFreq(HFFT hFFT, const fft_type *buffer,
fft_type *RealOut, fft_type *ImagOut)
{
// Copy the data into the real and imaginary outputs
for(int i=1;i<hFFT->Points;i++) {
@ -386,7 +387,7 @@ void ReorderToFreq(HFFT hFFT, fft_type *buffer, fft_type *RealOut, fft_type *Ima
ImagOut[hFFT->Points] = 0;
}
void ReorderToTime(HFFT hFFT, fft_type *buffer, fft_type *TimeOut)
void ReorderToTime(HFFT hFFT, const fft_type *buffer, fft_type *TimeOut)
{
// Copy the data into the real outputs
for(int i=0;i<hFFT->Points;i++) {

5
src/RealFFTf.h
View File

@ -21,8 +21,9 @@ void ReleaseFFT(HFFT);
void CleanupFFT();
void RealFFTf(fft_type *,HFFT);
void InverseRealFFTf(fft_type *,HFFT);
void ReorderToTime(HFFT hFFT, fft_type *buffer, fft_type *TimeOut);
void ReorderToFreq(HFFT hFFT, fft_type *buffer, fft_type *RealOut, fft_type *ImagOut);
void ReorderToTime(HFFT hFFT, const fft_type *buffer, fft_type *TimeOut);
void ReorderToFreq(HFFT hFFT, const fft_type *buffer,
fft_type *RealOut, fft_type *ImagOut);
#endif