Calculate actual ratios and hops

meson.build

@@ -38,7 +38,6 @@ library_sources = [
   'src/faster/HighFrequencyAudioCurve.cpp',
   'src/faster/SilentAudioCurve.cpp',
   'src/faster/PercussiveAudioCurve.cpp',
-  'src/faster/StretchCalculator.cpp',
   'src/faster/StretcherChannelData.cpp',
   'src/faster/StretcherImpl.cpp',
   'src/faster/StretcherProcess.cpp',
@@ -46,9 +45,9 @@ library_sources = [
   'src/common/Resampler.cpp',
   'src/common/FFT.cpp',
   'src/common/Allocators.cpp',
+  'src/common/StretchCalculator.cpp',
   'src/common/sysutils.cpp',
   'src/common/Thread.cpp',
-  'src/temporary.cpp', 
   'src/finer/R3StretcherImpl.cpp', 
 ]
 

src/RubberBandStretcher.cpp

@@ -39,8 +39,9 @@ RubberBandStretcher::RubberBandStretcher(size_t sampleRate,
     */
     m_d(nullptr),
     //!!! +logger
-    m_r3d(new R3StretcherImpl(R3StretcherImpl::Parameters
-                              (sampleRate, channels)))
+    m_r3d(new R3StretcherImpl(R3StretcherImpl::Parameters(sampleRate, channels),
+                              initialTimeRatio,
+                              initialPitchScale))
 {
 }
 

src/common/StretchCalculator.cpp

@@ -30,7 +30,7 @@
 #include <cassert>
 #include <algorithm>
 
-#include "../common/sysutils.h"
+#include "sysutils.h"
 
 namespace RubberBand
 {

src/faster/StretcherImpl.cpp

@@ -27,9 +27,9 @@
 #include "HighFrequencyAudioCurve.h"
 #include "SilentAudioCurve.h"
 #include "CompoundAudioCurve.h"
-#include "StretchCalculator.h"
 #include "StretcherChannelData.h"
 
+#include "../common/StretchCalculator.h"
 #include "../common/Resampler.h"
 #include "../common/Profiler.h"
 #include "../common/sysutils.h"

src/faster/StretcherProcess.cpp

@@ -22,9 +22,9 @@
 */
 
 #include "StretcherImpl.h"
-#include "StretchCalculator.h"
 #include "StretcherChannelData.h"
 
+#include "../common/StretchCalculator.h"
 #include "../common/Resampler.h"
 #include "../common/Profiler.h"
 #include "../common/VectorOps.h"

src/finer/R3StretcherImpl.cpp

@@ -31,12 +31,39 @@ void
 R3StretcherImpl::setTimeRatio(double ratio)
 {
     m_timeRatio = ratio;
+    calculateHop();
 }
 
 void
 R3StretcherImpl::setPitchScale(double scale)
 {
     m_pitchScale = scale;
+    calculateHop();
+}
+
+void
+R3StretcherImpl::calculateHop()
+{
+    double ratio = getEffectiveRatio();
+    double proposedOuthop = 256;
+    
+    if (ratio > 1.0) {
+        double inhop = proposedOuthop / ratio;
+        if (inhop < 1.0) {
+            m_parameters.logger("WARNING: Extreme ratio yields ideal inhop < 1, results may be suspect");
+            m_inhop = 1;
+        } else {
+            m_inhop = int(round(inhop));
+        }
+    } else {
+        double inhop = std::min(proposedOuthop / ratio, 340.0);
+        m_inhop = int(round(inhop));
+    }
+
+    std::ostringstream str;
+    str << "R3StretcherImpl::calculateHop: for effective ratio " << ratio
+        << " calculated (typical) inhop of " << m_inhop << std::endl;
+    m_parameters.logger(str.str());
 }
 
 double
@@ -144,17 +171,29 @@ R3StretcherImpl::retrieve(float *const *output, size_t samples) const
 void
 R3StretcherImpl::consume()
 {
-    int inhop = 171, outhop = 256; //!!!
-    double ratio = double(outhop) / double(inhop);
+    double ratio = getEffectiveRatio();
 
     int longest = m_guideConfiguration.longestFftSize;
     int classify = m_guideConfiguration.classificationFftSize;
 
+    int outhop = m_calculator->calculateSingle(ratio,
+                                               1.0 / m_pitchScale,
+                                               1.f,
+                                               m_inhop,
+                                               longest,
+                                               longest);
+
+    double instantaneousRatio = double(outhop) / double(m_inhop);
+    
     while ((m_draining || m_channelData[0]->inbuf->getReadSpace() >= longest) &&
            m_channelData[0]->outbuf->getWriteSpace() >= outhop) {
 
         m_parameters.logger("consume looping");
 
+        if (m_draining && m_channelData[0]->inbuf->getReadSpace() == 0) {
+            break;
+        }
+        
         for (int c = 0; c < m_parameters.channels; ++c) {
 
             auto cd = m_channelData.at(c);
@@ -200,7 +239,8 @@ R3StretcherImpl::consume()
             m_troughPicker.findNearestAndNextPeaks
                 (classifyScale->mag.data(), 3, nullptr,
                  classifyScale->nextTroughs.data());
-            m_guide.calculate(ratio, classifyScale->mag.data(),
+            m_guide.calculate(instantaneousRatio,
+                              classifyScale->mag.data(),
                               classifyScale->nextTroughs.data(),
                               classifyScale->prevMag.data(),
                               cd->segmentation,
@@ -225,7 +265,7 @@ R3StretcherImpl::consume()
                  m_channelAssembly.phase.data(),
                  m_guideConfiguration,
                  m_channelAssembly.guidance.data(),
-                 inhop,
+                 m_inhop,
                  outhop);
         }
 
@@ -300,7 +340,7 @@ R3StretcherImpl::consume()
                 v_zero(acc.data() + n, outhop);
             }
             cd->outbuf->write(cd->mixdown.data(), outhop);
-            cd->inbuf->skip(inhop);
+            cd->inbuf->skip(m_inhop);
         }
     }
 }

src/finer/R3StretcherImpl.h

@@ -29,6 +29,7 @@
 #include "Peak.h"
 #include "PhaseAdvance.h"
 
+#include "../common/StretchCalculator.h"
 #include "../common/FFT.h"
 #include "../common/FixedVector.h"
 #include "../common/Allocators.h"
@@ -53,12 +54,17 @@ public:
             sampleRate(_sampleRate), channels(_channels), logger(_log) { }
     };
     
-    R3StretcherImpl(Parameters parameters) :
+    R3StretcherImpl(Parameters parameters,
+                    double initialTimeRatio,
+                    double initialPitchScale) :
         m_parameters(parameters),
+        m_timeRatio(initialTimeRatio),
+        m_pitchScale(initialPitchScale),
         m_guide(Guide::Parameters(m_parameters.sampleRate)),
         m_guideConfiguration(m_guide.getConfiguration()),
         m_channelAssembly(m_parameters.channels),
         m_troughPicker(m_guideConfiguration.classificationFftSize / 2 + 1),
+        m_inhop(1),
         m_draining(false)
     {
         BinSegmenter::Parameters segmenterParameters
@@ -89,6 +95,12 @@ public:
                  m_parameters.logger);
             m_scaleData[fftSize] = std::make_shared<ScaleData>(guidedParameters);
         }
+
+        m_calculator = std::unique_ptr<StretchCalculator>
+            (new StretchCalculator(int(round(m_parameters.sampleRate)), //!!! which is a double...
+                                   1, false)); // no fixed inputIncrement
+
+        calculateHop();
     }
     
     ~R3StretcherImpl() { }
@@ -198,9 +210,16 @@ protected:
     Guide::Configuration m_guideConfiguration;
     ChannelAssembly m_channelAssembly;
     Peak<float, std::less<float>> m_troughPicker;
+    std::unique_ptr<StretchCalculator> m_calculator;
+    int m_inhop;
     bool m_draining;
 
     void consume();
+    void calculateHop();
+
+    double getEffectiveRatio() const {
+        return m_timeRatio * m_pitchScale;
+    }
     
     static void logCerr(const std::string &message) {
         std::cerr << "RubberBandStretcher: " << message << std::endl;

vamp/RubberBandVampPlugin.cpp

@@ -23,7 +23,7 @@
 
 #include "RubberBandVampPlugin.h"
 
-#include "faster/StretchCalculator.h"
+#include "common/StretchCalculator.h"
 #include "common/sysutils.h"
 
 #include <cmath>