1 files changed, 88 insertions, 0 deletions
diff --git a/noatun/modules/winskin/vis/realFFTFilter.cpp b/noatun/modules/winskin/vis/realFFTFilter.cpp
new file mode 100644
index 00000000..13343bce
--- /dev/null
+++ b/noatun/modules/winskin/vis/realFFTFilter.cpp
@@ -0,0 +1,88 @@
+/*
+  a FFT filter
+  Copyright (C) 1998  Martin Vogt;Philip VanBaren, 2 September 1993
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#include "realFFTFilter.h"
+
+RealFFTFilter::RealFFTFilter(int fftPoints) {
+  this->fftPoints = fftPoints;
+  data=new short[fftPoints*4];  
+  realFFT= new RealFFT(fftPoints*2);
+}
+
+
+RealFFTFilter::~RealFFTFilter() {
+  delete data;
+  delete realFFT;
+}
+
+
+int RealFFTFilter::getPoints() {
+  return fftPoints;
+}
+
+
+short* RealFFTFilter::getPointPtr() {
+  return data;
+}
+
+
+/*
+  the array is expected to be a PCM stream (real data)
+*/
+int RealFFTFilter::fft16(float* left,float* right,int len) {
+  int i;
+
+  len=len/4;
+
+
+  int mixTmp;
+
+  // take care for no array overflows:
+  int n=min(len,fftPoints);
+
+  // copy things into fftArray.
+
+  for (i = 0 ; i < n; i++) {
+    mixTmp=(int) (16384.0*(left[i]+right[i]));
+
+    if (mixTmp < SHRT_MIN) {
+      data[i]= SHRT_MIN; 
+    } else {
+      if (mixTmp > SHRT_MAX) {
+	data[i] = SHRT_MAX; 
+      } else {
+	data[i]=(short)mixTmp;
+      }
+    }
+  }
+
+  realFFT->fft(data);
+  return true;
+}
+
+
+
+int* RealFFTFilter::getBitReversed() { 
+  return realFFT->getBitReversed();
+}
+
+
+
+int RealFFTFilter::min(int x1,int x2) { 
+  if (x1 < x2) {
+    return x1;
+  }
+  return x2;
+}
+
+