comparison dsp/rateconversion/Resampler.cpp @ 419:7ead6122aef7

Slightly simplify resampler

 #include "Resampler.h"
 
 #include "maths/MathUtilities.h"
 #include "base/KaiserWindow.h"
 #include "base/SincWindow.h"
-#include "thread/Thread.h"
 
 #include <iostream>
 #include <vector>
 #include <map>
 #include <cassert>
+#include <algorithm>
 
 using std::vector;
 using std::map;
 using std::cerr;
 using std::endl;

 
 Resampler::Resampler(int sourceRate, int targetRate) :
     m_sourceRate(sourceRate),
     m_targetRate(targetRate)
 {
+#ifdef DEBUG_RESAMPLER
+    cerr << "Resampler::Resampler(" <<  sourceRate << "," << targetRate << ")" << endl;
+#endif
     initialise(100, 0.02);
 }
 
 Resampler::Resampler(int sourceRate, int targetRate, 
                      double snr, double bandwidth) :

 Resampler::~Resampler()
 {
     delete[] m_phaseData;
 }
 
-// peakToPole -> length -> beta -> window
-static map<double, map<int, map<double, vector<double> > > >
-knownFilters;
-
-static Mutex
-knownFilterMutex;
-
 void
 Resampler::initialise(double snr, double bandwidth)
 {
     int higher = std::max(m_sourceRate, m_targetRate);
     int lower = std::min(m_sourceRate, m_targetRate);

         (params.length > 200001 ? 200001 : params.length);
 
     m_filterLength = params.length;
 
     vector<double> filter;
-    knownFilterMutex.lock();
-
-    if (knownFilters[m_peakToPole][m_filterLength].find(params.beta) ==
-	knownFilters[m_peakToPole][m_filterLength].end()) {
-
-	KaiserWindow kw(params);
-	SincWindow sw(m_filterLength, m_peakToPole * 2);
-
-	filter = vector<double>(m_filterLength, 0.0);
-	for (int i = 0; i < m_filterLength; ++i) filter[i] = 1.0;
-	sw.cut(filter.data());
-	kw.cut(filter.data());
-
-	knownFilters[m_peakToPole][m_filterLength][params.beta] = filter;
-    }
-
-    filter = knownFilters[m_peakToPole][m_filterLength][params.beta];
-    knownFilterMutex.unlock();
-
+
+    KaiserWindow kw(params);
+    SincWindow sw(m_filterLength, m_peakToPole * 2);
+
+    filter = vector<double>(m_filterLength, 0.0);
+    for (int i = 0; i < m_filterLength; ++i) filter[i] = 1.0;
+    sw.cut(filter.data());
+    kw.cut(filter.data());
+    
     int inputSpacing = m_targetRate / m_gcd;
     int outputSpacing = m_sourceRate / m_gcd;
 
 #ifdef DEBUG_RESAMPLER
     cerr << "resample " << m_sourceRate << " -> " << m_targetRate

 {
     Phase &pd = m_phaseData[m_phase];
     double v = 0.0;
     int n = pd.filter.size();
 
-    assert(n + m_bufferOrigin <= (int)m_buffer.size());
-
-    const double *const __restrict__ buf = m_buffer.data() + m_bufferOrigin;
-    const double *const __restrict__ filt = pd.filter.data();
+    if (n + m_bufferOrigin > (int)m_buffer.size()) {
+        cerr << "ERROR: n + m_bufferOrigin > m_buffer.size() [" << n << " + "
+             << m_bufferOrigin << " > " << m_buffer.size() << "]" << endl;
+        throw std::logic_error("n + m_bufferOrigin > m_buffer.size()");
+    }
+
+#if defined(__MSVC__)
+#define R__ __restrict
+#elif defined(__GNUC__)
+#define R__ __restrict__
+#else
+#define R__
+#endif
+
+    const double *const R__ buf(m_buffer.data() + m_bufferOrigin);
+    const double *const R__ filt(pd.filter.data());
 
     for (int i = 0; i < n; ++i) {
 	// NB gcc can only vectorize this with -ffast-math
 	v += buf[i] * filt[i];
     }

 }
 
 int
 Resampler::process(const double *src, double *dst, int n)
 {
-    for (int i = 0; i < n; ++i) {
-	m_buffer.push_back(src[i]);
-    }
+    m_buffer.insert(m_buffer.end(), src, src + n);
 
     int maxout = int(ceil(double(n) * m_targetRate / m_sourceRate));
     int outidx = 0;
 
 #ifdef DEBUG_RESAMPLER

 
     while (outidx < maxout &&
 	   m_buffer.size() >= m_phaseData[m_phase].filter.size() + m_bufferOrigin) {
 	dst[outidx] = scaleFactor * reconstructOne();
 	outidx++;
+    }
+
+    if (m_bufferOrigin > (int)m_buffer.size()) {
+        cerr << "ERROR: m_bufferOrigin > m_buffer.size() [" 
+             << m_bufferOrigin << " > " << m_buffer.size() << "]" << endl;
+        throw std::logic_error("m_bufferOrigin > m_buffer.size()");
     }
 
     m_buffer = vector<double>(m_buffer.begin() + m_bufferOrigin, m_buffer.end());
     m_bufferOrigin = 0;