Remove elastic/loose processing support

main/main.cpp

@@ -90,7 +90,7 @@ int main(int argc, char **argv)
     double frequencyshift = 1.0;
     int debug = 0;
     bool realtime = false;
-    bool precise = true;
+    bool precisiongiven = false;
     int threading = 0;
     bool lamination = true;
     bool longwin = false;
@@ -179,8 +179,8 @@ int main(int argc, char **argv)
         case 'f': frequencyshift = atof(optarg); haveRatio = true; break;
         case 'd': debug = atoi(optarg); break;
         case 'R': realtime = true; break;
-        case 'L': precise = false; break;
+        case 'L': precisiongiven = true; break;
-        case 'P': precise = true; break;
+        case 'P': precisiongiven = true; break;
         case 'F': formant = true; break;
         case '0': threading = 1; break;
         case '@': threading = 2; break;
@@ -276,9 +276,10 @@ int main(int argc, char **argv)
         cerr << "crispness parameter are intended to provide the best sounding set of options" << endl;
         cerr << "for most situations. The default is to use none of these options." << endl;
         cerr << endl;
-        cerr << "  -L,    --loose          Relax timing in hope of better transient preservation" << endl;
+        cerr << "  -R,    --realtime       Select realtime mode (implies --no-threads)." << endl;
-        cerr << "  -P,    --precise        Ignored: The opposite of -L, this is default from 1.6" << endl;
+        cerr << "                          This utility does not do realtime stream processing;" << endl;
-        cerr << "  -R,    --realtime       Select realtime mode (implies --no-threads)" << endl;
+        cerr << "                          the option merely selects realtime mode for the" << endl;
+        cerr << "                          stretcher it uses" << endl;
         cerr << "         --no-threads     No extra threads regardless of CPU and channel count" << endl;
         cerr << "         --threads        Assume multi-CPU even if only one CPU is identified" << endl;
         cerr << "         --no-transients  Disable phase resynchronisation at transients" << endl;
@@ -294,6 +295,8 @@ int main(int argc, char **argv)
         cerr << "                          (at a cost in width and individual channel quality)" << endl;
         cerr << "         --ignore-clipping Ignore clipping at output; the default is to restart" << endl;
         cerr << "                          with reduced gain if clipping occurs" << endl;
+        cerr << "  -L,    --loose          [Accepted for compatibility but ignored; always off]" << endl;
+        cerr << "  -P,    --precise        [Accepted for compatibility but ignored; always on]" << endl;
         cerr << endl;
         cerr << "  -d<N>, --debug <N>      Select debug level (N = 0,1,2,3); default 0, full 3" << endl;
         cerr << "                          (N.B. debug level 3 includes audible ticks in output)" << endl;
@@ -330,6 +333,11 @@ int main(int argc, char **argv)
         hqpitch = false;
     }
 
+    if (precisiongiven) {
+        cerr << "NOTE: The -L/--loose and -P/--precise options are both ignored -- precise" << endl;
+        cerr << "      became the default in v1.6 and loose was removed in v3.0" << endl;
+    }
+    
     switch (crispness) {
     case -1: crispness = 5; break;
     case 0: detector = CompoundDetector; transients = NoTransients; lamination = false; longwin = true; shortwin = false; break;
@@ -493,7 +501,6 @@ int main(int argc, char **argv)
 
     RubberBandStretcher::Options options = 0;
     if (realtime)    options |= RubberBandStretcher::OptionProcessRealTime;
-    if (precise)     options |= RubberBandStretcher::OptionStretchPrecise;
     if (!lamination) options |= RubberBandStretcher::OptionPhaseIndependent;
     if (longwin)     options |= RubberBandStretcher::OptionWindowLong;
     if (shortwin)    options |= RubberBandStretcher::OptionWindowShort;

meson.build

@@ -38,10 +38,8 @@ library_sources = [
   'src/base/Profiler.cpp',
   'src/dsp/AudioCurveCalculator.cpp',
   'src/audiocurves/CompoundAudioCurve.cpp',
-  'src/audiocurves/SpectralDifferenceAudioCurve.cpp',
   'src/audiocurves/HighFrequencyAudioCurve.cpp',
   'src/audiocurves/SilentAudioCurve.cpp',
-  'src/audiocurves/ConstantAudioCurve.cpp',
   'src/audiocurves/PercussiveAudioCurve.cpp',
   'src/dsp/Resampler.cpp',
   'src/dsp/FFT.cpp',

rubberband/RubberBandStretcher.h

@@ -109,27 +109,6 @@ public:
      * non-real-time operation on seekable files: Offline; real-time
      * or streaming operation: RealTime.
      *
-     * 2. Flags prefixed \c OptionStretch control the profile used for
-     * variable timestretching.  Rubber Band always adjusts the
-     * stretch profile to minimise stretching of busy broadband
-     * transient sounds, but the degree to which it does so is
-     * adjustable.  These options may not be changed after
-     * construction.
-     *
-     *   \li \c OptionStretchElastic - Only meaningful in offline
-     *   mode, and the default in that mode.  The audio will be
-     *   stretched at a variable rate, aimed at preserving the quality
-     *   of transient sounds as much as possible.  The timings of low
-     *   activity regions between transients may be less exact than
-     *   when the precise flag is set.
-     * 
-     *   \li \c OptionStretchPrecise - Although still using a variable
-     *   stretch rate, the audio will be stretched so as to maintain
-     *   as close as possible to a linear stretch ratio throughout.
-     *   Timing may be better than when using \c OptionStretchElastic, at
-     *   slight cost to the sound quality of transients.  This setting
-     *   is always used when running in real-time mode.
-     *
      * 3. Flags prefixed \c OptionTransients control the component
      * frequency phase-reset mechanism that may be used at transient
      * points to provide clarity and realism to percussion and other
@@ -293,6 +272,10 @@ public:
      *   setting).  This usually leads to better focus in the centre
      *   but a loss of stereo space and width.  Any channels beyond
      *   the first two are processed individually.
+     *
+     * Finally, flags prefixed \c OptionStretch are obsolete flags
+     * provided for backward compatibility only. They are ignored by
+     * the stretcher.
      */
     
     enum Option {
@@ -300,8 +283,8 @@ public:
         OptionProcessOffline       = 0x00000000,
         OptionProcessRealTime      = 0x00000001,
 
-        OptionStretchElastic       = 0x00000000,
+        OptionStretchElastic       = 0x00000000, // obsolete
-        OptionStretchPrecise       = 0x00000010,
+        OptionStretchPrecise       = 0x00000010, // obsolete
     
         OptionTransientsCrisp      = 0x00000000,
         OptionTransientsMixed      = 0x00000100,

rubberband/rubberband-c.h

@@ -57,8 +57,8 @@ enum RubberBandOption {
     RubberBandOptionProcessOffline       = 0x00000000,
     RubberBandOptionProcessRealTime      = 0x00000001,
 
-    RubberBandOptionStretchElastic       = 0x00000000,
+    RubberBandOptionStretchElastic       = 0x00000000, // obsolete
-    RubberBandOptionStretchPrecise       = 0x00000010,
+    RubberBandOptionStretchPrecise       = 0x00000010, // obsolete
     
     RubberBandOptionTransientsCrisp      = 0x00000000,
     RubberBandOptionTransientsMixed      = 0x00000100,

src/StretchCalculator.cpp

@@ -74,11 +74,8 @@ StretchCalculator::setKeyFrameMap(const std::map<size_t, size_t> &mapping)
 
 std::vector<int>
 StretchCalculator::calculate(double ratio, size_t inputDuration,
-                             const std::vector<float> &phaseResetDf,
+                             const std::vector<float> &phaseResetDf)
-                             const std::vector<float> &stretchDf)
 {
-    assert(phaseResetDf.size() == stretchDf.size());
-    
     m_peaks = findPeaks(phaseResetDf);
 
     size_t totalCount = phaseResetDf.size();
@@ -107,16 +104,6 @@ StretchCalculator::calculate(double ratio, size_t inputDuration,
 
     size_t totalInput = 0, totalOutput = 0;
 
-    // For each region between two consecutive time sync points, we
-    // want to take the number of output chunks to be allocated and
-    // the detection function values within the range, and produce a
-    // series of increments that sum to the number of output chunks,
-    // such that each increment is displaced from the input increment
-    // by an amount inversely proportional to the magnitude of the
-    // stretch detection function at that input step.
-
-    size_t regionTotalChunks = 0;
-
     std::vector<int> increments;
 
     for (size_t i = 0; i <= peaks.size(); ++i) {
@@ -147,41 +134,55 @@ StretchCalculator::calculate(double ratio, size_t inputDuration,
         if (regionEndChunk > totalCount) regionEndChunk = totalCount;
         if (regionEnd > outputDuration) regionEnd = outputDuration;
 
+        if (regionEndChunk < regionStartChunk) regionEndChunk = regionStartChunk;
+        if (regionEnd < regionStart) regionEnd = regionStart;
+
         size_t regionDuration = regionEnd - regionStart;
-        regionTotalChunks += regionDuration;
 
-        std::vector<float> dfRegion;
+        size_t nchunks = regionEndChunk - regionStartChunk;
 
-        for (size_t j = regionStartChunk; j != regionEndChunk; ++j) {
+        if (nchunks == 0) {
-            dfRegion.push_back(stretchDf[j]);
+            //!!!
+            break;
         }
 
-        if (m_debugLevel > 1) {
+        double per = double(regionDuration) / double(nchunks);
-            std::cerr << "distributeRegion from " << regionStartChunk << " to " << regionEndChunk << " (samples " << regionStart << " to " << regionEnd << ")" << std::endl;
+        double acc = 0.0;
-        }
+        size_t nremaining = nchunks;
-
-        dfRegion = smoothDF(dfRegion);
-        
-        std::vector<int> regionIncrements = distributeRegion
-            (dfRegion, regionDuration, ratio, phaseReset);
-
         size_t totalForRegion = 0;
 
-        for (size_t j = 0; j < regionIncrements.size(); ++j) {
+        if (phaseReset) {
-
+            size_t incr;
-            int incr = regionIncrements[j];
+            if (nchunks > 1) {
-
+                incr = m_increment;
-            if (j == 0 && phaseReset) increments.push_back(-incr);
+                if (incr > regionDuration) {
-            else increments.push_back(incr);
+                    incr = regionDuration;
-
+                }
-            if (incr > 0) totalForRegion += incr;
+            } else {
-            else totalForRegion += -incr;
+                incr = regionDuration;
-
+            }
+            increments.push_back(- int64_t(incr));
+            per = double(regionDuration - incr) / double(nchunks - 1);
+            acc += incr;
+            totalForRegion += incr;
             totalInput += m_increment;
+            nremaining = nremaining - 1;
         }
 
-        if (totalForRegion != regionDuration) {
+        if (nremaining > 0) {
-            std::cerr << "*** ERROR: distributeRegion returned wrong duration " << totalForRegion << ", expected " << regionDuration << std::endl;
+            for (size_t j = 0; j+1 < nremaining; ++j) {
+                acc += per;
+                size_t incr = size_t(round(acc - totalForRegion));
+                increments.push_back(incr);
+                totalForRegion += incr;
+                totalInput += m_increment;
+            }
+            if (regionDuration > totalForRegion) {
+                size_t final = regionDuration - totalForRegion;
+                increments.push_back(final);
+                totalForRegion += final;
+                totalInput += m_increment;
+            }
         }
 
         totalOutput += totalForRegion;
@@ -189,7 +190,6 @@ StretchCalculator::calculate(double ratio, size_t inputDuration,
 
     if (m_debugLevel > 0) {
         std::cerr << "total input increment = " << totalInput << " (= " << totalInput / m_increment << " chunks), output = " << totalOutput << ", ratio = " << double(totalOutput)/double(totalInput) << ", ideal output " << size_t(ceil(totalInput * ratio)) << std::endl;
-        std::cerr << "(region total = " << regionTotalChunks << ")" << std::endl;
     }
 
     return increments;
@@ -861,285 +861,5 @@ StretchCalculator::smoothDF(const std::vector<float> &df)
     return smoothedDF;
 }
 
-std::vector<int>
-StretchCalculator::distributeRegion(const std::vector<float> &dfIn,
-                                    size_t duration, float ratio, bool phaseReset)
-{
-    std::vector<float> df(dfIn);
-    std::vector<int> increments;
-
-    // The peak for the stretch detection function may appear after
-    // the peak that we're using to calculate the start of the region.
-    // We don't want that.  If we find a peak in the first half of
-    // the region, we should set all the values up to that point to
-    // the same value as the peak.
-
-    // (This might not be subtle enough, especially if the region is
-    // long -- we want a bound that corresponds to acoustic perception
-    // of the audible bounce.)
-
-    for (size_t i = 1; i < df.size()/2; ++i) {
-        if (df[i] < df[i-1]) {
-            if (m_debugLevel > 1) {
-                std::cerr << "stretch peak offset: " << i-1 << " (peak " << df[i-1] << ")" << std::endl;
-            }
-            for (size_t j = 0; j < i-1; ++j) {
-                df[j] = df[i-1];
-            }
-            break;
-        }
-    }
-
-    float maxDf = 0;
-
-    for (size_t i = 0; i < df.size(); ++i) {
-        if (i == 0 || df[i] > maxDf) maxDf = df[i];
-    }
-
-    // We want to try to ensure the last 100ms or so (if possible) are
-    // tending back towards the maximum df, so that the stretchiness
-    // reduces at the end of the stretched region.
-    
-    int reducedRegion = lrint((0.1 * m_sampleRate) / m_increment);
-    if (reducedRegion > int(df.size()/5)) reducedRegion = df.size()/5;
-
-    for (int i = 0; i < reducedRegion; ++i) {
-        size_t index = df.size() - reducedRegion + i;
-        df[index] = df[index] + ((maxDf - df[index]) * i) / reducedRegion;
-    }
-
-    long toAllot = long(duration) - long(m_increment * df.size());
-    
-    if (m_debugLevel > 1) {
-        std::cerr << "region of " << df.size() << " chunks, output duration " << duration << ", increment " << m_increment << ", toAllot " << toAllot << std::endl;
-    }
-
-    size_t totalIncrement = 0;
-
-    // We place limits on the amount of displacement per chunk.  if
-    // ratio < 0, no increment should be larger than increment*ratio
-    // or smaller than increment*ratio/2; if ratio > 0, none should be
-    // smaller than increment*ratio or larger than increment*ratio*2.
-    // We need to enforce this in the assignment of displacements to
-    // allotments, not by trying to respond if something turns out
-    // wrong.
-
-    // Note that the ratio is only provided to this function for the
-    // purposes of establishing this bound to the displacement.
-    
-    // so if
-    // maxDisplacement / totalDisplacement > increment * ratio*2 - increment
-    // (for ratio > 1)
-    // or
-    // maxDisplacement / totalDisplacement < increment * ratio/2
-    // (for ratio < 1)
-
-    // then we need to adjust and accommodate
-    
-    double totalDisplacement = 0;
-    double maxDisplacement = 0; // min displacement will be 0 by definition
-
-    maxDf = 0;
-    float adj = 0;
-
-    bool tooShort = true, tooLong = true;
-    const int acceptableIterations = 10;
-    int iteration = 0;
-    int prevExtreme = 0;
-    bool better = false;
-
-    while ((tooLong || tooShort) && iteration < acceptableIterations) {
-
-        ++iteration;
-
-        tooLong = false;
-        tooShort = false;
-        calculateDisplacements(df, maxDf, totalDisplacement, maxDisplacement,
-                               adj);
-
-        if (m_debugLevel > 1) {
-            std::cerr << "totalDisplacement " << totalDisplacement << ", max " << maxDisplacement << " (maxDf " << maxDf << ", df count " << df.size() << ")" << std::endl;
-        }
-
-        if (totalDisplacement == 0) {
-// Not usually a problem, in fact
-//            std::cerr << "WARNING: totalDisplacement == 0 (duration " << duration << ", " << df.size() << " values in df)" << std::endl;
-            if (!df.empty() && adj == 0) {
-                tooLong = true; tooShort = true;
-                adj = 1;
-            }
-            continue;
-        }
-
-        int extremeIncrement = m_increment +
-            lrint((toAllot * maxDisplacement) / totalDisplacement);
-
-        if (extremeIncrement < 0) {
-            if (m_debugLevel > 0) {
-                std::cerr << "NOTE: extreme increment " << extremeIncrement << " < 0, adjusting" << std::endl;
-            }
-            tooShort = true;
-        } else {
-            if (ratio < 1.0) {
-                if (extremeIncrement > lrint(ceil(m_increment * ratio))) {
-                    std::cerr << "WARNING: extreme increment "
-                              << extremeIncrement << " > "
-                              << m_increment * ratio << std::endl;
-                } else if (extremeIncrement < (m_increment * ratio) / 2) {
-                    if (m_debugLevel > 0) {
-                        std::cerr << "NOTE: extreme increment "
-                                  << extremeIncrement << " < " 
-                                  << (m_increment * ratio) / 2
-                                  << ", adjusting" << std::endl;
-                    }
-                    tooShort = true;
-                    if (iteration > 0) {
-                        better = (extremeIncrement > prevExtreme);
-                    }
-                    prevExtreme = extremeIncrement;
-                }
-            } else {
-                if (extremeIncrement > m_increment * ratio * 2) {
-                    if (m_debugLevel > 0) {
-                        std::cerr << "NOTE: extreme increment "
-                                  << extremeIncrement << " > "
-                                  << m_increment * ratio * 2
-                                  << ", adjusting" << std::endl;
-                    }
-                    tooLong = true;
-                    if (iteration > 0) {
-                        better = (extremeIncrement < prevExtreme);
-                    }
-                    prevExtreme = extremeIncrement;
-                } else if (extremeIncrement < lrint(floor(m_increment * ratio))) {
-                    std::cerr << "WARNING: extreme increment "
-                              << extremeIncrement << " < "
-                              << m_increment * ratio << std::endl;
-                }
-            }
-        }
-
-        if (tooLong || tooShort) {
-            // Need to make maxDisplacement smaller as a proportion of
-            // the total displacement, yet ensure that the
-            // displacements still sum to the total.
-            adj += maxDf/10;
-        }
-    }
-
-    if (tooLong) {
-        if (better) {
-            // we were iterating in the right direction, so
-            // leave things as they are (and undo that last tweak)
-            std::cerr << "WARNING: No acceptable displacement adjustment found, using latest values:\nthis region could sound bad" << std::endl;
-            adj -= maxDf/10;
-        } else {
-            std::cerr << "WARNING: No acceptable displacement adjustment found, using defaults:\nthis region could sound bad" << std::endl;
-            adj = 1;
-            calculateDisplacements(df, maxDf, totalDisplacement, maxDisplacement,
-                                   adj);
-        }
-    } else if (tooShort) {
-        std::cerr << "WARNING: No acceptable displacement adjustment found, using flat distribution:\nthis region could sound bad" << std::endl;
-        adj = 1;
-        for (size_t i = 0; i < df.size(); ++i) {
-            df[i] = 1.f;
-        }
-        calculateDisplacements(df, maxDf, totalDisplacement, maxDisplacement,
-                               adj);
-    }
-
-    for (size_t i = 0; i < df.size(); ++i) {
-
-        double displacement = maxDf - df[i];
-        if (displacement < 0) displacement -= adj;
-        else displacement += adj;
-
-        if (i == 0 && phaseReset) {
-            if (m_debugLevel > 2) {
-                std::cerr << "Phase reset at first chunk" << std::endl;
-            }
-            if (df.size() == 1) {
-                increments.push_back(duration);
-                totalIncrement += duration;
-            } else {
-                increments.push_back(m_increment);
-                totalIncrement += m_increment;
-            }
-            totalDisplacement -= displacement;
-            continue;
-        }
-
-        double theoreticalAllotment = 0;
-
-        if (totalDisplacement != 0) {
-            theoreticalAllotment = (toAllot * displacement) / totalDisplacement;
-        }
-        int allotment = lrint(theoreticalAllotment);
-        if (i + 1 == df.size()) allotment = toAllot;
-
-        int increment = m_increment + allotment;
-
-        if (increment < 0) {
-            // this is a serious problem, the allocation is quite
-            // wrong if it allows increment to diverge so far from the
-            // input increment (though it can happen legitimately if
-            // asked to squash very violently)
-            std::cerr << "*** WARNING: increment " << increment << " <= 0, rounding to zero" << std::endl;
-
-            toAllot += m_increment;
-            increment = 0;
-
-        } else {
-            toAllot -= allotment;
-        }
-
-        increments.push_back(increment);
-        totalIncrement += increment;
-
-        totalDisplacement -= displacement;
-
-        if (m_debugLevel > 2) {
-            std::cerr << "df " << df[i] << ", smoothed " << df[i] << ", disp " << displacement << ", allot " << theoreticalAllotment << ", incr " << increment << ", remain " << toAllot << std::endl;
-        }
-    }
-    
-    if (m_debugLevel > 2) {
-        std::cerr << "total increment: " << totalIncrement << ", left over: " << toAllot << " to allot, displacement " << totalDisplacement << std::endl;
-    }
-
-    if (totalIncrement != duration) {
-        std::cerr << "*** WARNING: calculated output duration " << totalIncrement << " != expected " << duration << std::endl;
-    }
-
-    return increments;
-}
-
-void
-StretchCalculator::calculateDisplacements(const std::vector<float> &df,
-                                          float &maxDf,
-                                          double &totalDisplacement,
-                                          double &maxDisplacement,
-                                          float adj) const
-{
-    totalDisplacement = maxDisplacement = 0;
-
-    maxDf = 0;
-
-    for (size_t i = 0; i < df.size(); ++i) {
-        if (i == 0 || df[i] > maxDf) maxDf = df[i];
-    }
-
-    for (size_t i = 0; i < df.size(); ++i) {
-        double displacement = maxDf - df[i];
-        if (displacement < 0) displacement -= adj;
-        else displacement += adj;
-        totalDisplacement += displacement;
-        if (i == 0 || displacement > maxDisplacement) {
-            maxDisplacement = displacement;
-        }
-    }
-}
-
 }
 

src/StretchCalculator.h

@@ -51,13 +51,10 @@ public:
     /**
      * Calculate phase increments for a region of audio, given the
      * overall target stretch ratio, input duration in audio samples,
-     * and the audio curves to use for identifying phase lock points
+     * and the audio curves to use for identifying phase lock points.
-     * (lockAudioCurve) and for allocating stretches to relatively
-     * less prominent points (stretchAudioCurve).
      */
     std::vector<int> calculate(double ratio, size_t inputDuration,
-                               const std::vector<float> &lockAudioCurve,
+                               const std::vector<float> &lockAudioCurve);
-                               const std::vector<float> &stretchAudioCurve);
 
     /**
      * Calculate the phase increment for a single audio block, given
@@ -96,16 +93,6 @@ protected:
     void mapPeaks(std::vector<Peak> &peaks, std::vector<size_t> &targets,
                   size_t outputDuration, size_t totalCount);
 
-    std::vector<int> distributeRegion(const std::vector<float> &regionCurve,
-                                      size_t outputDuration, float ratio,
-                                      bool phaseReset);
-
-    void calculateDisplacements(const std::vector<float> &df,
-                                float &maxDf,
-                                double &totalDisplacement,
-                                double &maxDisplacement,
-                                float adj) const;
-
     size_t m_sampleRate;
     size_t m_increment;
     float m_prevDf;

src/StretcherImpl.cpp

@@ -25,9 +25,7 @@
 
 #include "audiocurves/PercussiveAudioCurve.h"
 #include "audiocurves/HighFrequencyAudioCurve.h"
-#include "audiocurves/SpectralDifferenceAudioCurve.h"
 #include "audiocurves/SilentAudioCurve.h"
-#include "audiocurves/ConstantAudioCurve.h"
 #include "audiocurves/CompoundAudioCurve.h"
 
 #include "dsp/Resampler.h"
@@ -105,7 +103,6 @@ RubberBandStretcher::Impl::Impl(size_t sampleRate,
     m_lastProcessPhaseResetDf(16),
     m_emergencyScavenger(10, 4),
     m_phaseResetAudioCurve(0),
-    m_stretchAudioCurve(0),
     m_silentAudioCurve(0),
     m_stretchCalculator(0),
     m_freq0(600),
@@ -150,12 +147,7 @@ RubberBandStretcher::Impl::Impl(size_t sampleRate,
     }
 
     if (m_options & OptionProcessRealTime) {
-
         m_realtime = true;
-
-        if (!(m_options & OptionStretchPrecise)) {
-            m_options |= OptionStretchPrecise;
-        }
     }
 
 #ifndef NO_THREADING
@@ -203,7 +195,6 @@ RubberBandStretcher::Impl::~Impl()
     }
 
     delete m_phaseResetAudioCurve;
-    delete m_stretchAudioCurve;
     delete m_silentAudioCurve;
     delete m_stretchCalculator;
     delete m_studyFFT;
@@ -249,7 +240,6 @@ RubberBandStretcher::Impl::reset()
 
     m_mode = JustCreated;
     if (m_phaseResetAudioCurve) m_phaseResetAudioCurve->reset();
-    if (m_stretchAudioCurve) m_stretchAudioCurve->reset();
     if (m_silentAudioCurve) m_silentAudioCurve->reset();
     m_inputDuration = 0;
     m_silentHistory = 0;
@@ -701,10 +691,6 @@ RubberBandStretcher::Impl::configure()
         }
     }
     
-    // stretchAudioCurve is unused in RT mode; phaseResetAudioCurve,
-    // silentAudioCurve and stretchCalculator however are used in all
-    // modes
-
     delete m_phaseResetAudioCurve;
     m_phaseResetAudioCurve = new CompoundAudioCurve
         (CompoundAudioCurve::Parameters(m_sampleRate, m_fftSize));
@@ -714,17 +700,6 @@ RubberBandStretcher::Impl::configure()
     m_silentAudioCurve = new SilentAudioCurve
         (SilentAudioCurve::Parameters(m_sampleRate, m_fftSize));
 
-    if (!m_realtime) {
-        delete m_stretchAudioCurve;
-        if (!(m_options & OptionStretchPrecise)) {
-            m_stretchAudioCurve = new SpectralDifferenceAudioCurve
-                (SpectralDifferenceAudioCurve::Parameters(m_sampleRate, m_fftSize));
-        } else {
-            m_stretchAudioCurve = new ConstantAudioCurve
-                (ConstantAudioCurve::Parameters(m_sampleRate, m_fftSize));
-        }
-    }
-
     delete m_stretchCalculator;
     m_stretchCalculator = new StretchCalculator
         (m_sampleRate, m_increment,
@@ -765,7 +740,6 @@ RubberBandStretcher::Impl::reconfigure()
             // the df vectors
             calculateStretch();
             m_phaseResetDf.clear();
-            m_stretchDf.clear();
             m_silence.clear();
             m_inputDuration = 0;
         }
@@ -854,9 +828,6 @@ RubberBandStretcher::Impl::reconfigure()
     if (m_fftSize != prevFftSize) {
         m_phaseResetAudioCurve->setFftSize(m_fftSize);
         m_silentAudioCurve->setFftSize(m_fftSize);
-        if (m_stretchAudioCurve) {
-            m_stretchAudioCurve->setFftSize(m_fftSize);
-        }
         somethingChanged = true;
     }
 
@@ -1069,9 +1040,6 @@ RubberBandStretcher::Impl::study(const float *const *input, size_t samples, bool
 
 //            cout << m_phaseResetDf.size() << " [" << final << "] -> " << df << " \t: ";
 
-            df = m_stretchAudioCurve->processFloat(cd.fltbuf, m_increment);
-            m_stretchDf.push_back(df);
-
             df = m_silentAudioCurve->processFloat(cd.fltbuf, m_increment);
             bool silent = (df > 0.f);
             if (silent && m_debugLevel > 1) {
@@ -1163,28 +1131,10 @@ RubberBandStretcher::Impl::calculateStretch()
         }
     }
 
-/*
-    double prdm = 0, sdm = 0;
-    if (!m_phaseResetDf.empty()) {
-        for (int i = 0; i < (int)m_phaseResetDf.size(); ++i) {
-            prdm += m_phaseResetDf[i];
-        }
-        prdm /= m_phaseResetDf.size();
-    }
-    if (!m_stretchDf.empty()) {
-        for (int i = 0; i < (int)m_stretchDf.size(); ++i) {
-            sdm += m_stretchDf[i];
-        }
-        sdm /= m_stretchDf.size();
-    }
-    std::cerr << "phase reset df mean = " << prdm << ", stretch df mean = " << sdm << std::endl;
-*/
-
     std::vector<int> increments = m_stretchCalculator->calculate
         (getEffectiveRatio(),
          inputDuration,
-         m_phaseResetDf,
+         m_phaseResetDf);
-         m_stretchDf);
 
     int history = 0;
     for (size_t i = 0; i < increments.size(); ++i) {

src/StretcherImpl.h

@@ -221,18 +221,18 @@ protected:
     typedef std::set<ProcessThread *> ThreadSet;
     ThreadSet m_threadSet;
 
-#if defined HAVE_IPP && !defined USE_SPEEX
+#if defined(HAVE_IPP) && !defined(NO_THREADING) && !defined(USE_BQRESAMPLER) && !defined(USE_SPEEX) && !defined(HAVE_LIBSAMPLERATE)
     // Exasperatingly, the IPP polyphase resampler does not appear to
-    // be thread-safe as advertised -- a good reason to prefer the
+    // be thread-safe as advertised -- a good reason to prefer any of
-    // Speex alternative
+    // the alternatives
+#define STRETCHER_IMPL_RESAMPLER_MUTEX_REQUIRED 1
     Mutex m_resamplerMutex;
 #endif
-#endif
+#endif // ! NO_THREADING
     
     size_t m_inputDuration;
     CompoundAudioCurve::Type m_detectorType;
     std::vector<float> m_phaseResetDf;
-    std::vector<float> m_stretchDf;
     std::vector<bool> m_silence;
     int m_silentHistory;
 
@@ -246,7 +246,6 @@ protected:
     Scavenger<RingBuffer<float> > m_emergencyScavenger;
 
     CompoundAudioCurve *m_phaseResetAudioCurve;
-    AudioCurveCalculator *m_stretchAudioCurve;
     AudioCurveCalculator *m_silentAudioCurve;
     StretchCalculator *m_stretchCalculator;
 

src/StretcherProcess.cpp

@@ -22,11 +22,6 @@
 */
 
 #include "StretcherImpl.h"
-
-#include "audiocurves/PercussiveAudioCurve.h"
-#include "audiocurves/HighFrequencyAudioCurve.h"
-#include "audiocurves/ConstantAudioCurve.h"
-
 #include "StretchCalculator.h"
 #include "StretcherChannelData.h"
 
@@ -213,12 +208,10 @@ RubberBandStretcher::Impl::consumeChannel(size_t c,
             cd.setResampleBufSize(reqSize);
         }
 
-#ifndef NO_THREADING
+#if defined(STRETCHER_IMPL_RESAMPLER_MUTEX_REQUIRED)
-#if defined HAVE_IPP && !defined USE_SPEEX
         if (m_threaded) {
             m_resamplerMutex.lock();
         }
-#endif
 #endif
 
         if (useMidSide) {
@@ -235,12 +228,10 @@ RubberBandStretcher::Impl::consumeChannel(size_t c,
                                          1.0 / m_pitchScale,
                                          final);
 
-#ifndef NO_THREADING
+#if defined(STRETCHER_IMPL_RESAMPLER_MUTEX_REQUIRED)
-#if defined HAVE_IPP && !defined USE_SPEEX
         if (m_threaded) {
             m_resamplerMutex.unlock();
         }
-#endif
 #endif
     }
 
@@ -1102,12 +1093,11 @@ RubberBandStretcher::Impl::writeChunk(size_t channel, size_t shiftIncrement, boo
             cd.setResampleBufSize(reqSize);
         }
 
-#ifndef NO_THREADING
+
-#if defined HAVE_IPP && !defined USE_SPEEX
+#if defined(STRETCHER_IMPL_RESAMPLER_MUTEX_REQUIRED)
         if (m_threaded) {
             m_resamplerMutex.lock();
         }
-#endif
 #endif
 
         size_t outframes = cd.resampler->resample(&cd.resamplebuf,
@@ -1117,12 +1107,10 @@ RubberBandStretcher::Impl::writeChunk(size_t channel, size_t shiftIncrement, boo
                                                   1.0 / m_pitchScale,
                                                   last);
 
-#ifndef NO_THREADING
+#if defined(STRETCHER_IMPL_RESAMPLER_MUTEX_REQUIRED)
-#if defined HAVE_IPP && !defined USE_SPEEX
         if (m_threaded) {
             m_resamplerMutex.unlock();
         }
-#endif
 #endif
 
         writeOutput(*cd.outbuf, cd.resamplebuf,

src/audiocurves/ConstantAudioCurve.cpp

@@ -1,57 +0,0 @@
-/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
-
-/*
-    Rubber Band Library
-    An audio time-stretching and pitch-shifting library.
-    Copyright 2007-2022 Particular Programs Ltd.
-
-    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; either version 2 of the
-    License, or (at your option) any later version.  See the file
-    COPYING included with this distribution for more information.
-
-    Alternatively, if you have a valid commercial licence for the
-    Rubber Band Library obtained by agreement with the copyright
-    holders, you may redistribute and/or modify it under the terms
-    described in that licence.
-
-    If you wish to distribute code using the Rubber Band Library
-    under terms other than those of the GNU General Public License,
-    you must obtain a valid commercial licence before doing so.
-*/
-
-#include "ConstantAudioCurve.h"
-
-namespace RubberBand
-{
-
-
-ConstantAudioCurve::ConstantAudioCurve(Parameters parameters) :
-    AudioCurveCalculator(parameters)
-{
-}
-
-ConstantAudioCurve::~ConstantAudioCurve()
-{
-}
-
-void
-ConstantAudioCurve::reset()
-{
-}
-
-float
-ConstantAudioCurve::processFloat(const float *R__, int)
-{
-    return 1.f;
-}
-
-double
-ConstantAudioCurve::processDouble(const double *R__, int)
-{
-    return 1.0;
-}
-
-}
-

src/audiocurves/ConstantAudioCurve.h

@@ -1,45 +0,0 @@
-/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
-
-/*
-    Rubber Band Library
-    An audio time-stretching and pitch-shifting library.
-    Copyright 2007-2022 Particular Programs Ltd.
-
-    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; either version 2 of the
-    License, or (at your option) any later version.  See the file
-    COPYING included with this distribution for more information.
-
-    Alternatively, if you have a valid commercial licence for the
-    Rubber Band Library obtained by agreement with the copyright
-    holders, you may redistribute and/or modify it under the terms
-    described in that licence.
-
-    If you wish to distribute code using the Rubber Band Library
-    under terms other than those of the GNU General Public License,
-    you must obtain a valid commercial licence before doing so.
-*/
-
-#ifndef RUBBERBAND_CONSTANT_AUDIO_CURVE_H
-#define RUBBERBAND_CONSTANT_AUDIO_CURVE_H
-
-#include "../dsp/AudioCurveCalculator.h"
-
-namespace RubberBand
-{
-
-class ConstantAudioCurve : public AudioCurveCalculator
-{
-public:
-    ConstantAudioCurve(Parameters parameters);
-    virtual ~ConstantAudioCurve();
-
-    virtual float processFloat(const float *R__ mag, int increment);
-    virtual double processDouble(const double *R__ mag, int increment);
-    virtual void reset();
-};
-
-}
-
-#endif

src/audiocurves/SpectralDifferenceAudioCurve.cpp

@@ -1,107 +0,0 @@
-/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
-
-/*
-    Rubber Band Library
-    An audio time-stretching and pitch-shifting library.
-    Copyright 2007-2022 Particular Programs Ltd.
-
-    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; either version 2 of the
-    License, or (at your option) any later version.  See the file
-    COPYING included with this distribution for more information.
-
-    Alternatively, if you have a valid commercial licence for the
-    Rubber Band Library obtained by agreement with the copyright
-    holders, you may redistribute and/or modify it under the terms
-    described in that licence.
-
-    If you wish to distribute code using the Rubber Band Library
-    under terms other than those of the GNU General Public License,
-    you must obtain a valid commercial licence before doing so.
-*/
-
-#include "SpectralDifferenceAudioCurve.h"
-
-#include "../system/Allocators.h"
-#include "../system/VectorOps.h"
-
-namespace RubberBand
-{
-
-
-SpectralDifferenceAudioCurve::SpectralDifferenceAudioCurve(Parameters parameters) :
-    AudioCurveCalculator(parameters)
-{
-    m_mag = allocate<double>(m_lastPerceivedBin + 1);
-    m_tmpbuf = allocate<double>(m_lastPerceivedBin + 1);
-    v_zero(m_mag, m_lastPerceivedBin + 1);
-}
-
-SpectralDifferenceAudioCurve::~SpectralDifferenceAudioCurve()
-{
-    deallocate(m_mag);
-    deallocate(m_tmpbuf);
-}
-
-void
-SpectralDifferenceAudioCurve::reset()
-{
-    v_zero(m_mag, m_lastPerceivedBin + 1);
-}
-
-void
-SpectralDifferenceAudioCurve::setFftSize(int newSize)
-{
-    deallocate(m_tmpbuf);
-    deallocate(m_mag);
-    AudioCurveCalculator::setFftSize(newSize);
-    m_mag = allocate<double>(m_lastPerceivedBin + 1);
-    m_tmpbuf = allocate<double>(m_lastPerceivedBin + 1);
-    reset();
-}
-
-float
-SpectralDifferenceAudioCurve::processFloat(const float *R__ mag, int)
-{
-    double result = 0.0;
-
-    const int hs1 = m_lastPerceivedBin + 1;
-
-    v_convert(m_tmpbuf, mag, hs1);
-    v_square(m_tmpbuf, hs1);
-    v_subtract(m_mag, m_tmpbuf, hs1);
-    v_abs(m_mag, hs1);
-    v_sqrt(m_mag, hs1);
-    
-    for (int i = 0; i < hs1; ++i) {
-        result += m_mag[i];
-    }
-
-    v_copy(m_mag, m_tmpbuf, hs1);
-    return result;
-}
-
-double
-SpectralDifferenceAudioCurve::processDouble(const double *R__ mag, int)
-{
-    double result = 0.0;
-
-    const int hs1 = m_lastPerceivedBin + 1;
-
-    v_convert(m_tmpbuf, mag, hs1);
-    v_square(m_tmpbuf, hs1);
-    v_subtract(m_mag, m_tmpbuf, hs1);
-    v_abs(m_mag, hs1);
-    v_sqrt(m_mag, hs1);
-    
-    for (int i = 0; i < hs1; ++i) {
-        result += m_mag[i];
-    }
-
-    v_copy(m_mag, m_tmpbuf, hs1);
-    return result;
-}
-
-}
-

src/audiocurves/SpectralDifferenceAudioCurve.h

@@ -1,54 +0,0 @@
-/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
-
-/*
-    Rubber Band Library
-    An audio time-stretching and pitch-shifting library.
-    Copyright 2007-2022 Particular Programs Ltd.
-
-    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; either version 2 of the
-    License, or (at your option) any later version.  See the file
-    COPYING included with this distribution for more information.
-
-    Alternatively, if you have a valid commercial licence for the
-    Rubber Band Library obtained by agreement with the copyright
-    holders, you may redistribute and/or modify it under the terms
-    described in that licence.
-
-    If you wish to distribute code using the Rubber Band Library
-    under terms other than those of the GNU General Public License,
-    you must obtain a valid commercial licence before doing so.
-*/
-
-#ifndef RUBBERBAND_SPECTRALDIFFERENCE_AUDIO_CURVE_H
-#define RUBBERBAND_SPECTRALDIFFERENCE_AUDIO_CURVE_H
-
-#include "../dsp/AudioCurveCalculator.h"
-#include "../dsp/Window.h"
-
-namespace RubberBand
-{
-
-class SpectralDifferenceAudioCurve : public AudioCurveCalculator
-{
-public:
-    SpectralDifferenceAudioCurve(Parameters parameters);
-
-    virtual ~SpectralDifferenceAudioCurve();
-
-    virtual void setFftSize(int newSize);
-
-    virtual float processFloat(const float *R__ mag, int increment);
-    virtual double processDouble(const double *R__ mag, int increment);
-    virtual void reset();
-    virtual const char *getUnit() const { return "V"; }
-
-protected:
-    double *R__ m_mag;
-    double *R__ m_tmpbuf;
-};
-
-}
-
-#endif