1 files changed, 148 insertions, 0 deletions
diff --git a/noatun/modules/winskin/vis/winSkinFFT_impl.cpp b/noatun/modules/winskin/vis/winSkinFFT_impl.cpp
new file mode 100644
index 00000000..5396ac3c
--- /dev/null
+++ b/noatun/modules/winskin/vis/winSkinFFT_impl.cpp
@@ -0,0 +1,148 @@
+/*
+  implementation for winskin fft
+  Copyright (C) 2000  Martin Vogt
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+
+#include "winSkinFFT_impl.h"
+#include <audiosubsys.h>
+#include <cstring>
+
+#define __BANDS  75
+
+namespace Noatun {
+
+WinSkinFFT_impl::WinSkinFFT_impl() {
+  fftBands_short=256;
+  realFFTFilter= new RealFFTFilter(fftBands_short);
+  fftArray=new int[fftBands_short];
+  bands=0;
+
+  fragCnt=(int)(AudioSubSystem::the()->fragmentCount());
+  visQueue=new VISQueue(fragCnt);
+  writePos=0;
+
+}
+
+WinSkinFFT_impl::~WinSkinFFT_impl(){
+  delete realFFTFilter;
+  delete fftArray;
+  delete visQueue;
+}
+
+void WinSkinFFT_impl::streamInit() {
+}
+
+
+void WinSkinFFT_impl::streamStart() {
+}
+
+
+void WinSkinFFT_impl::calculateBlock(unsigned long samples) {
+
+
+  unsigned long i;
+
+  // monitoring only tasks can't be done with that StereoEffect
+  // interface nicely - copy input to output until there is
+  // something better
+  // (when?)
+  int n=sizeof(float)*samples;
+  memcpy(outleft,inleft,n);
+  memcpy(outright,inright,n);
+
+
+  if (realFFTFilter->fft16(inleft,inright,samples) == false) {
+    return;
+  }
+
+
+  
+  //
+  // The following modifications have nothing to do
+  // with an fft, they only make the output look nice.
+  // (mostly scaling)
+
+  short* fftPtr;
+  int* bitReversed;
+
+  fftPtr=realFFTFilter->getPointPtr();
+  bitReversed=realFFTFilter->getBitReversed();
+
+  int pos=0;
+  int step=realFFTFilter->getPoints()/__BANDS;
+
+
+  int re;
+  int im;
+  int tmp;
+
+  float max=0.0;
+  float avg=0.0;
+
+
+
+  for (i=0;i<__BANDS;i++) {
+    re=(int)fftPtr[bitReversed[pos]];
+    im=(int)fftPtr[bitReversed[pos]+1];
+    
+    tmp=re*re+im*im;  
+    // Here I check a new idea. We remove all low values
+    // and all values over xyz to xyz.
+    fftArray[pos]=(int)(::sqrt(::sqrt(tmp)));
+    
+    if (fftArray[pos]<=15) {
+      max+=fftArray[pos];
+    } else {
+      max+=15+fftArray[pos]/2;
+    }
+    pos=pos+step;
+  }
+  avg=0.65*max/(float)__BANDS;
+  
+  pos=0;
+  vector<float>* visAnalyserArray=visQueue->getElement(writePos);
+  visAnalyserArray->clear();
+  visAnalyserArray->reserve(__BANDS);
+  for (i=0;i<__BANDS;i++) {
+    float val=(float)(fftArray[pos]-avg);
+    visAnalyserArray->push_back(val);
+    pos=pos+step;
+  }
+  writePos++;
+  if (writePos >= fragCnt) writePos=0;
+
+}
+
+
+void WinSkinFFT_impl::bandResolution(float res) {
+  bands=(int)res;
+}
+
+float WinSkinFFT_impl::bandResolution() {
+  return (float)bands;
+}
+
+
+vector<float>* WinSkinFFT_impl::scope() {
+  int delay=writePos+1;
+  if (delay >= fragCnt) delay=0;
+ 
+
+  vector<float>* visAnalyserArray=visQueue->getElement(delay);
+    
+  return new vector<float>(*visAnalyserArray);
+}
+
+
+REGISTER_IMPLEMENTATION(WinSkinFFT_impl);
+  
+}