* Various tweaks to improve performance at large ratios

src/StretcherImpl.cpp

@@ -303,7 +303,8 @@ RubberBandStretcher::Impl::calculateSizes()
                 inputIncrement /= 2;
                 outputIncrement = lrint(ceil(inputIncrement * r));
             }
-            blockSize = std::max(blockSize, roundUp(outputIncrement * 4.5));
+            blockSize = std::max(blockSize, roundUp(outputIncrement * 6));
+            if (r > 5) while (blockSize < 8192) blockSize *= 2;
         }
 
     } else {
@@ -327,6 +328,7 @@ RubberBandStretcher::Impl::calculateSizes()
                 inputIncrement = int(outputIncrement / r);
             }
             blockSize = std::max(blockSize, roundUp(outputIncrement * 6));
+            if (r > 5) while (blockSize < 8192) blockSize *= 2;
         }
     }        
 
@@ -391,7 +393,7 @@ RubberBandStretcher::Impl::calculateSizes()
     //necessary. clearly something wrong in our calculations... or do
     //we just need to ensure client calls setMaxProcessBlockSize?
     if (!m_realtime && !m_threaded) {
-//!!!        m_outbufSize = m_outbufSize * 2;
+        m_outbufSize = m_outbufSize * 2;
     }
 }
 

src/StretcherProcess.cpp

@@ -481,9 +481,27 @@ RubberBandStretcher::Impl::modifyChunk(size_t channel, size_t outputIncrement,
 
         cd.freqPeak[0] = 0;
 
-        size_t limit0 = lrint((m_freq0 * m_blockSize) / rate);
+        float freq0 = m_freq0;
+
+        // As the stretch ratio increases, so the frequency thresholds
+        // for phase lamination should increase.  Beyond a ratio of
+        // about 1.5, the threshold should be about 1200Hz; beyond a
+        // ratio of 2, we probably want no lamination to happen at all
+        // by default.  This calculation aims for that.
+
+        //!!! we should only do this if asked to -- and when not
+        //setting f0,f1,f2 explicitly
+        float r = getEffectiveRatio();
+        if (r > 1) {
+            float rf0 = 600 + (600 * ((r-1)*(r-1)*2));
+//            std::cerr << "ratio = " << r << ", rf0 = " << rf0 << std::endl;
+            freq0 = std::max(freq0, rf0);
+        }
+
+        size_t limit0 = lrint((freq0 * m_blockSize) / rate);
         size_t limit1 = lrint((m_freq1 * m_blockSize) / rate);
         size_t limit2 = lrint((m_freq2 * m_blockSize) / rate);
+
         size_t range = 0;
 
         if (limit1 < limit0) limit1 = limit0;
@@ -700,6 +718,11 @@ RubberBandStretcher::Impl::writeChunk(size_t channel, size_t shiftIncrement, boo
             cd.resamplebuf = new float[cd.resamplebufSize];
         }
 
+#ifdef HAVE_IPP
+        if (m_threaded) {
+            m_resamplerMutex.lock();
+        }
+#endif
 
         size_t outframes = cd.resampler->resample(&cd.accumulator,
                                                   &cd.resamplebuf,
@@ -707,6 +730,11 @@ RubberBandStretcher::Impl::writeChunk(size_t channel, size_t shiftIncrement, boo
                                                   1.0 / m_pitchScale,
                                                   last);
 
+#ifdef HAVE_IPP
+        if (m_threaded) {
+            m_resamplerMutex.unlock();
+        }
+#endif
 
         writeOutput(*cd.outbuf, cd.resamplebuf,
                     outframes, cd.outCount, theoreticalOut);

src/ladspa/RubberBandPitchShifter.cpp

@@ -183,12 +183,12 @@ RubberBandPitchShifter::RubberBandPitchShifter(int sampleRate, size_t channels)
     m_extraLatency(8192), //!!! this should be at least the maximum possible displacement from linear at input rates, divided by the pitch scale factor.  It could be very large
     m_stretcher(new RubberBand::RubberBandStretcher
                 (sampleRate, channels,
-                 RubberBand::RubberBandStretcher::OptionProcessRealTime |
-                 RubberBand::RubberBandStretcher::OptionStretchPrecise  |
+                 RubberBand::RubberBandStretcher::OptionProcessRealTime)),// |
+//                 RubberBand::RubberBandStretcher::OptionStretchPrecise  |
 //                 RubberBand::RubberBandStretcher::OptionTransientsSmooth |
-                 RubberBand::RubberBandStretcher::OptionTransientsCrisp |
-                 RubberBand::RubberBandStretcher::OptionPhasePeakLocked |
-                 RubberBand::RubberBandStretcher::OptionThreadingNone)),
+//                 RubberBand::RubberBandStretcher::OptionTransientsCrisp |
+//                 RubberBand::RubberBandStretcher::OptionPhasePeakLocked |
+//                 RubberBand::RubberBandStretcher::OptionThreadingNone)),
     m_sampleRate(sampleRate),
     m_channels(channels)
 {

src/main.cpp

@@ -376,7 +376,7 @@ int main(int argc, char **argv)
                     float value = obf[c][i];
                     if (fabsf(value) > outpeak) outpeak = fabsf(value);
                     outsum += value * value;
-                    value *= 0.75;
+                    value *= 0.75;//!!!
                     if (value > 1.f) value = 1.f;
                     if (value < -1.f) value = -1.f;
                     fobf[i * channels + c] = value;