This commit is partial effort toward more libsoxr integration, that implements Rob Sykes's latest patch. I have no idea whether the Linux-specific stuff from the patch (e.g., M4 file) is still correct in this.

For Resample.* and QualityPrefs.cpp, this commit has my restructuring for distinguishing constant-rate vs variable-rate resamplers more generally. I think it's complete and ready for const-rate, but I have more review and testing to do for the var-rate cases. 

Variable-rate resampling is not implemented here, so Time Tracks are still broken, but this is a milestone in getting to a more general and correct structure. 

Also I think this fixes AboutDialog issues Steve noticed.

m4/audacity_checklib_libresample.m4

@@ -0,0 +1,46 @@
+dnl Add Audacity license?
+dnl Please increment the serial number below whenever you alter this macro
+dnl for the benefit of automatic macro update systems
+# audacity_checklib_libresample.m4 serial 1
+
+AC_DEFUN([AUDACITY_CHECKLIB_LIBRESAMPLE], [
+
+   AC_ARG_WITH(libresample,
+               [AS_HELP_STRING([--with-libresample],
+                               [use libresample for sample rate conversion: [yes,no]])],
+               LIBRESAMPLE_ARGUMENT=$withval,
+               LIBRESAMPLE_ARGUMENT="unspecified")
+
+   if false ; then
+      AC_DEFINE(USE_LIBRESAMPLE, 1,
+                [Define if libresample support should be enabled])
+   fi
+
+   dnl see if libresample is installed on the system
+
+   dnl ... but libresample isn't generally installed as a system library...
+
+   LIBRESAMPLE_SYSTEM_AVAILABLE="no"
+
+   dnl see if libresample is available locally
+
+   AC_CHECK_FILE(${srcdir}/lib-src/libresample/include/libresample.h,
+                 resample_h_found="yes",
+                 resample_h_found="no")
+
+   if test "x$resample_h_found" = "xyes" ; then
+      LIBRESAMPLE_LOCAL_AVAILABLE="yes"
+      LIBRESAMPLE_LOCAL_LIBS="libresample.a"
+      LIBRESAMPLE_LOCAL_CXXFLAGS='-I$(top_srcdir)/lib-src/libresample/include'
+      LIBRESAMPLE_LOCAL_CPPSYMBOLS="USE_LIBRESAMPLE"
+
+      if test ! -f lib-src/libresample/Makefile ; then
+         LIBRESAMPLE_LOCAL_CONFIG_SUBDIRS="lib-src/libresample"
+      fi
+      AC_MSG_NOTICE([libresample libraries are available in the local tree])
+   else
+      LIBRESAMPLE_LOCAL_AVAILABLE="no"
+      AC_MSG_NOTICE([libresample libraries are NOT available in the local tree])
+   fi
+])
+

src/AboutDialog.cpp

@@ -414,14 +414,17 @@ void AboutDialog::PopulateInformationPage( ShuttleGui & S )
    #elif USE_LIBSAMPLERATE
    AddBuildinfoRow(&informationStr, wxT("libsamplerate"),
          _("Sample rate conversion"), enabled);
-   #elif USE_LIBSOXR
-   AddBuildinfoRow(&informationStr, wxT("libsoxr"),
-         _("Sample rate conversion"), enabled);
    #else
       AddBuildinfoRow(&informationStr, wxT("libresample"),
             _("Sample rate conversion"), disabled);
       AddBuildinfoRow(&informationStr, wxT("libsamplerate"),
             _("Sample rate conversion"), disabled);
+   #endif
+
+   #if USE_LIBSOXR
+      AddBuildinfoRow(&informationStr, wxT("libsoxr"),
+            _("Sample rate conversion"), enabled);
+   #else
       AddBuildinfoRow(&informationStr, wxT("libsoxr"),
             _("Sample rate conversion"), disabled);
    #endif

src/AudioIO.cpp

@@ -1314,7 +1314,7 @@ int AudioIO::StartStream(WaveTrackArray playbackTracks,
             }
 
             mCaptureBuffers = new RingBuffer* [mCaptureTracks.GetCount()];
-            mResample = new Resample* [mCaptureTracks.GetCount()];
+            mResample = new ConstRateResample* [mCaptureTracks.GetCount()];
             mFactor = sampleRate / mRate;
 
             // Set everything to zero in case we have to delete these due to a memory exception.
@@ -1325,7 +1325,7 @@ int AudioIO::StartStream(WaveTrackArray playbackTracks,
             {
                mCaptureBuffers[i] = new RingBuffer( mCaptureTracks[i]->GetSampleFormat(),
                                                     captureBufferSize );
-               mResample[i] = new Resample( true, mFactor, mFactor );
+               mResample[i] = new ConstRateResample(true, mFactor);
             }
          }
       }

src/AudioIO.h

@@ -38,7 +38,7 @@
 class AudioIO;
 class RingBuffer;
 class Mixer;
-class Resample;
+class ConstRateResample;
 class TimeTrack;
 class AudioThread;
 class Meter;
@@ -474,7 +474,7 @@ private:
 #ifdef EXPERIMENTAL_MIDI_OUT
    AudioThread         *mMidiThread;
 #endif
-   Resample          **mResample;
+   ConstRateResample **mResample;
    RingBuffer        **mCaptureBuffers;
    WaveTrackArray      mCaptureTracks;
    RingBuffer        **mPlaybackBuffers;

src/Mix.cpp

@@ -281,7 +281,7 @@ Mixer::Mixer(int numInputTracks, WaveTrack **inputTracks,
    mQueueStart = new int[mNumInputTracks];
    mQueueLen = new int[mNumInputTracks];
    mSampleQueue = new float *[mNumInputTracks];
-   mSRC = new Resample*[mNumInputTracks];
+   mSRC = new Resample*[mNumInputTracks]; //vvvvv
    for(i=0; i<mNumInputTracks; i++) {
       double factor = (mRate / mInputTrack[i]->GetRate());
       double lowFactor = factor, highFactor = factor;
@@ -289,7 +289,7 @@ Mixer::Mixer(int numInputTracks, WaveTrack **inputTracks,
          highFactor /= timeTrack->GetRangeLower() / 100.0;
          lowFactor /= timeTrack->GetRangeUpper() / 100.0;
       }
-      mSRC[i] = new Resample(highQuality, lowFactor, highFactor);
+      mSRC[i] = new Resample(); //vvvvv
       mSampleQueue[i] = new float[mQueueMaxLen];
       mQueueStart[i] = 0;
       mQueueLen[i] = 0;

src/Resample.cpp

@@ -1,16 +1,19 @@
 /**********************************************************************
 
    Audacity: A Digital Audio Editor
+   Audacity(R) is copyright (c) 1999-2012 Audacity Team.
+   License: GPL v2.  See License.txt.
 
-  Dominic Mazzoni
+   Resample.cpp
+   Dominic Mazzoni, Rob Sykes, Vaughan Johnson
 
-*******************************************************************//*!
+******************************************************************//**
 
 \class Resample
-\brief Combined interface to libresample and libsamplerate (which libsoxr emulates).
+\brief Combined interface to libresample, libsamplerate, and libsoxr.
 
-  This class abstracts the interface to two different resampling
+   This class abstracts the interface to two different variable-rate
-  libraries:
+   resampling libraries:
 
       libresample, written by Dominic Mazzoni based on Resample-1.7
       by Julius Smith.  LGPL.
@@ -19,37 +22,119 @@
       of libsamplerate requests that you not distribute a binary version
       of Audacity that links to libsamplerate and also has plug-in support.
 
+      Since Audacity always does resampling on mono streams that are
+      contiguous in memory, this class doesn't support multiple channels
+      or some of the other optional features of some of these resamplers.
+
+   and the fixed-rate resampling library:
+
+      libsoxr, written by Rob Sykes. LGPL.
 
 *//*******************************************************************/
 
 
 #include "Resample.h"
-#include "Prefs.h"
 
 #include <wx/intl.h>
 
-int Resample::GetFastMethod()
+//v Currently unused.
+//void Resample::SetFastMethod(int index)
+//{
+//   gPrefs->Write(GetFastMethodKey(), (long)index);
+//   gPrefs->Flush();
+//}
+//
+//void Resample::SetBestMethod(int index)
+//{
+//   gPrefs->Write(GetBestMethodKey(), (long)index);
+//   gPrefs->Flush();
+//}
+
+// constant-rate resampler(s)
+#ifdef USE_LIBSOXR
+
+   #include <soxr.h>
+
+   ConstRateResample::ConstRateResample(const bool useBestMethod, const double dFactor)
+      : Resample()
    {
-   return gPrefs->Read(GetFastMethodKey(), GetFastMethodDefault());
+      soxr_quality_spec_t q_spec = soxr_quality_spec("\0\1\4\6"[mMethod], 0);
+      mHandle = (void *)soxr_create(1, dFactor, 1, 0, 0, &q_spec, 0);
    }
 
-int Resample::GetBestMethod()
+   ConstRateResample::~ConstRateResample()
    {
-   return gPrefs->Read(GetBestMethodKey(), GetBestMethodDefault());
+      delete mHandle;
+      mHandle = NULL;
+      soxr_delete((soxr_t)mHandle);
    }
 
-void Resample::SetFastMethod(int index)
+   //v Currently unused. 
+   //wxString ConstRateResample::GetResamplingLibraryName()
+   //{
+   //   return _("Libsoxr by Rob Sykes");
+   //}
+
+   int ConstRateResample::GetNumMethods() { return 4; }
+
+   static char const * const soxr_method_names[] = {
+      "Quick & dirty", "Basic quality", "High quality", "Very high quality"
+   };
+
+   wxString ConstRateResample::GetMethodName(int index)
    {
-   gPrefs->Write(GetFastMethodKey(), (long)index);
+      return wxString(wxString::FromAscii(soxr_method_names[index]));
-   gPrefs->Flush();
    }
 
-void Resample::SetBestMethod(int index)
+   const wxString ConstRateResample::GetFastMethodKey()
    {
-   gPrefs->Write(GetBestMethodKey(), (long)index);
+      return wxT("/Quality/SampleRateConverter");
-   gPrefs->Flush();
    }
 
+   const wxString ConstRateResample::GetBestMethodKey()
+   {
+      return wxT("/Quality/HQSampleRateConverter");
+   }
+
+   int ConstRateResample::GetFastMethodDefault() {return 1;}
+   int ConstRateResample::GetBestMethodDefault() {return 3;}
+
+   int ConstRateResample::Process(double  factor,
+                                  float  *inBuffer,
+                                  int     inBufferLen,
+                                  bool    lastFlag,
+                                  int    *inBufferUsed,
+                                  float  *outBuffer,
+                                  int     outBufferLen)
+   {
+      size_t idone , odone;
+      soxr_set_oi_ratio((soxr_t)mHandle, factor);
+      soxr_process((soxr_t)mHandle,
+            inBuffer , (size_t)(lastFlag? ~inBufferLen : inBufferLen), &idone,
+            outBuffer, (size_t)                          outBufferLen, &odone);
+      *inBufferUsed = (int)idone;
+      return (int)odone;
+   }
+
+#else // no const-rate resampler
+   ConstRateResample::ConstRateResample(const bool useBestMethod, const double dFactor)
+      : Resample()
+   {
+   }
+
+   ConstRateResample::~ConstRateResample()
+   {
+   }
+#endif
+
+
+
+
+
+
+
+//vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
+
 #if USE_LIBRESAMPLE
 
 #include "libresample.h"
@@ -59,10 +144,11 @@ bool Resample::ResamplingEnabled()
    return true;
 }
 
-wxString Resample::GetResamplingLibraryName()
+//v Currently unused. 
-{
+//wxString Resample::GetResamplingLibraryName()
-   return _("Libresample by Dominic Mazzoni and Julius Smith");
+//{
-}
+//   return _("Libresample by Dominic Mazzoni and Julius Smith");
+//}
 
 int Resample::GetNumMethods()
 {
@@ -129,7 +215,7 @@ Resample::~Resample()
    resample_close(mHandle);
 }
 
-#elif USE_LIBSAMPLERATE || USE_LIBSOXR
+#elif USE_LIBSAMPLERATE 
 
 #include <samplerate.h>
 
@@ -138,16 +224,17 @@ bool Resample::ResamplingEnabled()
    return true;
 }
 
-wxString Resample::GetResamplingLibraryName()
+//v Currently unused. 
-{
+//wxString Resample::GetResamplingLibraryName()
-#ifdef USE_LIBSAMPLERATE
+//{
-   return _("Libsamplerate by Erik de Castro Lopo");
+//#ifdef USE_LIBSAMPLERATE
-#elif USE_LIBSOXR
+//   return _("Libsamplerate by Erik de Castro Lopo");
-   return _("Libsoxr by Rob Sykes");
+//#elif USE_LIBSOXR
-#else
+//   return _("Libsoxr by Rob Sykes");
-   return _("Unknown");
+//#else
-#endif
+//   return _("Unknown");
-}
+//#endif
+//}
 
 int Resample::GetNumMethods()
 {
@@ -248,96 +335,4 @@ Resample::~Resample()
    src_delete((SRC_STATE *)mHandle);
 }
 
-#else // No resampling support
-
-bool Resample::ResamplingEnabled()
-{
-   return false;
-}
-
-wxString Resample::GetResamplingLibraryName()
-{
-   return _("Resampling disabled.");
-}
-
-int Resample::GetNumMethods()
-{
-   return 1;
-}
-
-wxString Resample::GetMethodName(int index)
-{
-   return _("Resampling disabled.");
-}
-
-const wxString Resample::GetFastMethodKey()
-{
-   return wxT("/Quality/DisabledConverter");
-}
-
-const wxString Resample::GetBestMethodKey()
-{
-   return wxT("/Quality/DisabledConverter");
-}
-
-int Resample::GetFastMethodDefault()
-{
-   return 0;
-}
-
-int Resample::GetBestMethodDefault()
-{
-   return 0;
-}
-
-Resample::Resample(bool, double, double)
-{
-}
-
-bool Resample::Ok()
-{
-   return false;
-}
-
-int Resample::Process(double  factor,
-                      float  *inBuffer,
-                      int     inBufferLen,
-                      bool    lastFlag,
-                      int    *inBufferUsed,
-                      float  *outBuffer,
-                      int     outBufferLen)
-{
-   int i;
-   int len = inBufferLen;
-
-   if (len > outBufferLen)
-      len = outBufferLen;
-
-   for(i=0; i<len; i++)
-      outBuffer[i] = inBuffer[i];
-
-   return len;
-}
-
-Resample::~Resample()
-{
-}
-
 #endif
-
-
-
-
-
-
-// Indentation settings for Vim and Emacs and unique identifier for Arch, a
-// version control system. Please do not modify past this point.
-//
-// Local Variables:
-// c-basic-offset: 3
-// indent-tabs-mode: nil
-// End:
-//
-// vim: et sts=3 sw=3
-// arch-tag: ceb8c6d0-3df6-4b6f-b763-100fe856f6fb
-

src/Resample.h

@@ -1,22 +1,11 @@
 /**********************************************************************
 
    Audacity: A Digital Audio Editor
+   Audacity(R) is copyright (c) 1999-2012 Audacity Team.
+   License: GPL v2.  See License.txt.
 
-  Dominic Mazzoni
+   Resample.cpp
-
+   Dominic Mazzoni, Rob Sykes, Vaughan Johnson
-  This class abstracts the interface to two different resampling
-  libraries:
-
-    libresample, written by Dominic Mazzoni based on Resample-1.7
-    by Julius Smith.  LGPL.
-
-    libsamplerate, written by Erik de Castro Lopo.  GPL.  The author
-    of libsamplerate requests that you not distribute a binary version
-    of Audacity that links to libsamplerate and also has plug-in support.
-
-  Since Audacity always does resampling on mono streams that are
-  contiguous in memory, this class doesn't support multiple channels
-  or some of the other optional features of some of these resamplers.
 
 **********************************************************************/
 
@@ -27,51 +16,54 @@
 
 #include <wx/string.h>
 
+#include "Prefs.h"
 #include "SampleFormat.h"
 
 class Resample
 {
  public:
-
+   /// The first parameter lets you select either the best method or
-   /// This will return true if Audacity is being compiled with
+   /// the fast method. 
-   /// resampling support.
+   //v (The particular method used was previously set by
-   static bool ResamplingEnabled();
+   /// SetFastMethod or SetBestMethod.)  
+   // minFactor and maxFactor
+   /// specify the range of factors that will be used, if you plan
+   /// to vary the factor over time.  Otherwise set minFactor and
+   /// maxFactor to the same value for optimized performance.
+   Resample() 
+   { 
+      mMethod = 0; 
+      mHandle = NULL;
+      mInitial = false;
+   };
+   virtual ~Resample() {};
 
    /// Returns the name of the library used for resampling
    /// (long format, may include author name and version number).
-   static wxString GetResamplingLibraryName();
+   //v Currently unused. 
+   // virtual wxString GetResamplingLibraryName() { return _("Resampling disabled."); };
 
    /// Resamplers may have more than one method, offering a
    /// tradeoff between speed and quality.  This lets you query
    /// the various methods available.
-   static int GetNumMethods();
+   static int GetNumMethods() { return 1; };
-   static wxString GetMethodName(int index);
+   static wxString GetMethodName(int index) { return _("Resampling disabled."); };
 
    /// Audacity identifies two methods out of all of the choices:
    /// a Fast method intended for real-time audio I/O, and a Best
-   /// method intended for mixing and exporting.  These are saved
+   /// method intended for mixing and exporting. 
-   /// in the preferences when you call Set[Best,Fast]Method.
+   //v (These were previously saved
-   static int GetFastMethod();
+   /// in the preferences when you call Set[Best,Fast]Method.)
-   static int GetBestMethod();
+   int GetFastMethod() { return gPrefs->Read(GetFastMethodKey(), GetFastMethodDefault()); };
-   static void SetFastMethod(int index);
+   int GetBestMethod() { return gPrefs->Read(GetBestMethodKey(), GetBestMethodDefault()); };
-   static void SetBestMethod(int index);
+   //v Currently unused.
+   //static void SetFastMethod(int index);
+   //static void SetBestMethod(int index);
 
-   static const wxString GetFastMethodKey();
+   static const wxString GetFastMethodKey() { return wxT("/Quality/DisabledConverter"); };
-   static const wxString GetBestMethodKey();
+   static const wxString GetBestMethodKey() { return wxT("/Quality/DisabledConverter"); };
-   static int GetFastMethodDefault();
+   static int GetFastMethodDefault() { return 0; };
-   static int GetBestMethodDefault();
+   static int GetBestMethodDefault() { return 0; };
-
-   /// Constructor.
-   /// The first parameter lets you select either the best method or
-   /// the fast method - the particular method used was set by
-   /// SetFastMethod or SetBestMethod, above.  minFactor and maxFactor
-   /// specify the range of factors that will be used, if you plan
-   /// to vary the factor over time.  Otherwise set minFactor and
-   /// maxFactor to the same value for optimized performance.
-   Resample(bool useBestMethod, double minFactor, double maxFactor);
-
-   /// Returns true if the constructor succeeded.
-   bool Ok();
 
    /** @brief Main processing function. Resamples from the input buffer to the 
     * output buffer.
@@ -95,33 +87,57 @@ class Resample
     @param outBufferLen How big outBuffer is.
     @return Number of output samples created by this call
    */
-   int Process(double  factor,
+   virtual int Process(double  factor,
+                        float  *inBuffer,
+                        int     inBufferLen,
+                        bool    lastFlag,
+                        int    *inBufferUsed,
+                        float  *outBuffer,
+                        int     outBufferLen) 
+   {
+      // Base class method just copies data with no change. 
+      int i;
+      int len = inBufferLen;
+
+      if (len > outBufferLen)
+         len = outBufferLen;
+
+      for(i=0; i<len; i++)
+         outBuffer[i] = inBuffer[i];
+
+      return len;
+   };
+
+ protected:
+   int   mMethod; // resampler-specific enum for resampling method
+   void* mHandle; // constant-rate or variable-rate resampler (XOR per instance)
+   bool  mInitial;
+};
+
+class ConstRateResample : public Resample
+{
+ public:
+   ConstRateResample(const bool useBestMethod, const double dFactor);
+   virtual ~ConstRateResample();
+
+   // Override base class methods only if we actually have a const-rate library.
+   #if USE_LIBSOXR
+      static int GetNumMethods();
+      static wxString GetMethodName(int index);
+
+      static const wxString GetFastMethodKey();
+      static const wxString GetBestMethodKey();
+      static int GetFastMethodDefault();
+      static int GetBestMethodDefault();
+
+      virtual int Process(double  factor,
                            float  *inBuffer,
                            int     inBufferLen,
                            bool    lastFlag,
                            int    *inBufferUsed,
                            float  *outBuffer,
                            int     outBufferLen);
-
+   #endif
-   // Destructor
-   ~Resample();
-
- private:
-   int   mMethod;
-   void *mHandle;
-   bool  mInitial;
 };
 
 #endif // __AUDACITY_RESAMPLE_H__
-
-// Indentation settings for Vim and Emacs and unique identifier for Arch, a
-// version control system. Please do not modify past this point.
-//
-// Local Variables:
-// c-basic-offset: 3
-// indent-tabs-mode: nil
-// End:
-//
-// vim: et sts=3 sw=3
-// arch-tag: bffbe34c-3029-47dc-af4c-f83d9a26002c
-

src/WaveClip.cpp

@@ -1523,7 +1523,7 @@ bool WaveClip::Resample(int rate, ProgressDialog *progress)
       return true; // Nothing to do
 
    double factor = (double)rate / (double)mRate;
-   ::Resample* resample = new ::Resample(true, factor, factor);
+   ConstRateResample* resample = new ConstRateResample(true, factor);
    
    int bufsize = 65536;
    float* inBuffer = new float[bufsize];

src/effects/ChangeSpeed.cpp

@@ -209,7 +209,7 @@ bool EffectChangeSpeed::ProcessOne(WaveTrack * track,
    float * outBuffer = new float[outBufferSize]; 
 
    // Set up the resampling stuff for this track.
-   Resample resample(true, mFactor, mFactor);
+   ConstRateResample resample(true, mFactor);
 
    //Go through the track one buffer at a time. samplePos counts which
    //sample the current buffer starts at.

src/prefs/QualityPrefs.cpp

@@ -109,11 +109,17 @@ void QualityPrefs::GetNamesAndLabels()
    //------------- Converter Names
    // We used to set and get best/fast method via Resample.cpp.
    // Need to ensure that preferences strings in Resample.cpp match.
+   // Note that these methods used to be public and static, but are now protected and pure virtual.
    // int converterHQ = Resample::GetBestMethod();
    // int converter = Resample::GetFastMethod();
-   int numConverters = Resample::GetNumMethods();
+   //
+   //vvvvv Note that we're now using libsoxr for constant-rate resampling 
+   // and either libresample or libsamplerate for variable-rate, 
+   // and currently *not* allowing method choice for variable-rate, 
+   // per discussion on -devel.
+   int numConverters = ConstRateResample::GetNumMethods();
    for (int i = 0; i < numConverters; i++) {
-      mConverterNames.Add(Resample::GetMethodName(i));
+      mConverterNames.Add(ConstRateResample::GetMethodName(i));
       mConverterLabels.Add(i);
    }
 }
@@ -169,8 +175,8 @@ void QualityPrefs::PopulateOrExchange(ShuttleGui & S)
          S.SetStretchyCol(2);
 
          S.TieChoice(_("Sample Rate Con&verter:"),
-                     Resample::GetFastMethodKey(),
+                     ConstRateResample::GetFastMethodKey(),
-                     Resample::GetFastMethodDefault(),
+                     ConstRateResample::GetFastMethodDefault(),
                      mConverterNames,
                      mConverterLabels),
          S.SetSizeHints(mConverterNames);
@@ -191,8 +197,8 @@ void QualityPrefs::PopulateOrExchange(ShuttleGui & S)
       S.StartMultiColumn(2);
       {
          S.TieChoice(_("Sample Rate Conver&ter:"),
-                     Resample::GetBestMethodKey(),
+                     ConstRateResample::GetBestMethodKey(),
-                     Resample::GetBestMethodDefault(),
+                     ConstRateResample::GetBestMethodDefault(),
                      mConverterNames,
                      mConverterLabels),
          S.SetSizeHints(mConverterNames);

win/Projects/Audacity/Audacity.vcproj

@@ -47,7 +47,7 @@
 			<Tool
 				Name="VCCLCompilerTool"
 				Optimization="2"
-				AdditionalIncludeDirectories="&quot;$(WXWIN)\lib\vc_dll\mswu&quot;;&quot;$(WXWIN)\include&quot;;..\..;..\..\..\src\include\win32;..\..\..\src\include;&quot;..\..\..\lib-src\FileDialog&quot;;&quot;..\..\..\lib-src\expat&quot;;&quot;..\..\..\lib-src\ffmpeg\win32&quot;;&quot;..\..\..\lib-src\ffmpeg&quot;;&quot;..\..\..\lib-src\lib-widget-extra&quot;;&quot;..\..\..\lib-src\libflac\include&quot;;&quot;..\..\..\lib-src\libid3tag&quot;;&quot;..\..\..\lib-src\liblrdf&quot;;&quot;..\..\..\lib-src\libmad&quot;;&quot;..\..\..\lib-src\libnyquist&quot;;&quot;..\..\..\lib-src\libogg\include&quot;;&quot;..\..\..\lib-src\libresample\include&quot;;&quot;..\..\..\lib-src\libsamplerate\src&quot;;&quot;..\..\..\lib-src\libscorealign&quot;;..\libsndfile;&quot;..\..\..\lib-src\libvamp&quot;;&quot;..\..\..\lib-src\libvorbis\include&quot;;&quot;..\..\..\lib-src\portaudio-v19\include&quot;;&quot;..\..\..\lib-src\portmixer\include&quot;;&quot;..\..\..\lib-src\portsmf&quot;;&quot;..\..\..\lib-src\redland\raptor\src&quot;;&quot;..\..\..\lib-src\slv2&quot;;&quot;..\..\..\lib-src\sbsms\include&quot;;&quot;..\..\..\lib-src\soundtouch\include&quot;;&quot;..\..\..\lib-src\twolame\libtwolame&quot;;&quot;..\..\..\lib-src\portmidi\pm_common&quot;;&quot;..\..\..\lib-src\portmidi\pm_win&quot;;&quot;..\..\..\lib-src\portmidi\porttime&quot;"
+				AdditionalIncludeDirectories="&quot;$(WXWIN)\lib\vc_dll\mswu&quot;;&quot;$(WXWIN)\include&quot;;..\..;..\..\..\src\include\win32;..\..\..\src\include;&quot;..\..\..\lib-src\FileDialog&quot;;&quot;..\..\..\lib-src\expat&quot;;&quot;..\..\..\lib-src\ffmpeg\win32&quot;;&quot;..\..\..\lib-src\ffmpeg&quot;;&quot;..\..\..\lib-src\lib-widget-extra&quot;;&quot;..\..\..\lib-src\libflac\include&quot;;&quot;..\..\..\lib-src\libid3tag&quot;;&quot;..\..\..\lib-src\liblrdf&quot;;&quot;..\..\..\lib-src\libmad&quot;;&quot;..\..\..\lib-src\libnyquist&quot;;&quot;..\..\..\lib-src\libogg\include&quot;;&quot;..\..\..\lib-src\libresample\include&quot;;&quot;..\..\..\lib-src\libsamplerate\src&quot;;&quot;..\..\..\lib-src\libscorealign&quot;;..\libsndfile;&quot;..\..\..\lib-src\libsoxr\src&quot;;&quot;..\..\..\lib-src\libvamp&quot;;&quot;..\..\..\lib-src\libvorbis\include&quot;;&quot;..\..\..\lib-src\portaudio-v19\include&quot;;&quot;..\..\..\lib-src\portmixer\include&quot;;&quot;..\..\..\lib-src\portsmf&quot;;&quot;..\..\..\lib-src\redland\raptor\src&quot;;&quot;..\..\..\lib-src\slv2&quot;;&quot;..\..\..\lib-src\sbsms\include&quot;;&quot;..\..\..\lib-src\soundtouch\include&quot;;&quot;..\..\..\lib-src\twolame\libtwolame&quot;;&quot;..\..\..\lib-src\portmidi\pm_common&quot;;&quot;..\..\..\lib-src\portmidi\pm_win&quot;;&quot;..\..\..\lib-src\portmidi\porttime&quot;"
 				PreprocessorDefinitions="BUILDING_AUDACITY;FLAC__NO_DLL;__STDC_CONSTANT_MACROS;WXUSINGDLL;__WXMSW__;NDEBUG;WIN32;STRICT"
 				StringPooling="true"
 				RuntimeLibrary="2"
@@ -133,7 +133,7 @@
 			<Tool
 				Name="VCCLCompilerTool"
 				Optimization="0"
-				AdditionalIncludeDirectories="&quot;$(WXWIN)\lib\vc_dll\mswud&quot;;&quot;$(WXWIN)\include&quot;;..\..;..\..\..\src\include\win32;..\..\..\src\include;&quot;..\..\..\lib-src\FileDialog&quot;;&quot;..\..\..\lib-src\expat&quot;;&quot;..\..\..\lib-src\lib-widget-extra&quot;;&quot;..\..\..\lib-src\libflac\include&quot;;&quot;..\..\..\lib-src\libid3tag&quot;;&quot;..\..\..\lib-src\liblrdf&quot;;&quot;..\..\..\lib-src\libmad&quot;;&quot;..\..\..\lib-src\libnyquist&quot;;&quot;..\..\..\lib-src\libogg\include&quot;;&quot;..\..\..\lib-src\libresample\include&quot;;&quot;..\..\..\lib-src\libsamplerate\src&quot;;&quot;..\..\..\lib-src\libscorealign&quot;;..\libsndfile;&quot;..\..\..\lib-src\libvamp&quot;;&quot;..\..\..\lib-src\libvorbis\include&quot;;&quot;..\..\..\lib-src\portaudio-v19\include&quot;;&quot;..\..\..\lib-src\portmixer\include&quot;;&quot;..\..\..\lib-src\portsmf&quot;;&quot;..\..\..\lib-src\redland\raptor\src&quot;;&quot;..\..\..\lib-src\slv2&quot;;&quot;..\..\..\lib-src\sbsms\include&quot;;&quot;..\..\..\lib-src\soundtouch\include&quot;;&quot;..\..\..\lib-src\twolame\libtwolame&quot;;&quot;..\..\..\lib-src\portmidi\pm_common&quot;;&quot;..\..\..\lib-src\portmidi\pm_win&quot;;&quot;..\..\..\lib-src\portmidi\porttime&quot;;&quot;..\..\..\lib-src\ffmpeg\win32&quot;;&quot;..\..\..\lib-src\ffmpeg&quot;"
+				AdditionalIncludeDirectories="&quot;$(WXWIN)\lib\vc_dll\mswud&quot;;&quot;$(WXWIN)\include&quot;;..\..;..\..\..\src\include\win32;..\..\..\src\include;&quot;..\..\..\lib-src\FileDialog&quot;;&quot;..\..\..\lib-src\expat&quot;;&quot;..\..\..\lib-src\lib-widget-extra&quot;;&quot;..\..\..\lib-src\libflac\include&quot;;&quot;..\..\..\lib-src\libid3tag&quot;;&quot;..\..\..\lib-src\liblrdf&quot;;&quot;..\..\..\lib-src\libmad&quot;;&quot;..\..\..\lib-src\libnyquist&quot;;&quot;..\..\..\lib-src\libogg\include&quot;;&quot;..\..\..\lib-src\libresample\include&quot;;&quot;..\..\..\lib-src\libsamplerate\src&quot;;&quot;..\..\..\lib-src\libscorealign&quot;;..\libsndfile;&quot;..\..\..\lib-src\libsoxr\src&quot;;&quot;..\..\..\lib-src\libvamp&quot;;&quot;..\..\..\lib-src\libvorbis\include&quot;;&quot;..\..\..\lib-src\portaudio-v19\include&quot;;&quot;..\..\..\lib-src\portmixer\include&quot;;&quot;..\..\..\lib-src\portsmf&quot;;&quot;..\..\..\lib-src\redland\raptor\src&quot;;&quot;..\..\..\lib-src\slv2&quot;;&quot;..\..\..\lib-src\sbsms\include&quot;;&quot;..\..\..\lib-src\soundtouch\include&quot;;&quot;..\..\..\lib-src\twolame\libtwolame&quot;;&quot;..\..\..\lib-src\portmidi\pm_common&quot;;&quot;..\..\..\lib-src\portmidi\pm_win&quot;;&quot;..\..\..\lib-src\portmidi\porttime&quot;;&quot;..\..\..\lib-src\ffmpeg\win32&quot;;&quot;..\..\..\lib-src\ffmpeg&quot;"
 				PreprocessorDefinitions="BUILDING_AUDACITY;FLAC__NO_DLL;__STDC_CONSTANT_MACROS;WXUSINGDLL;__WXMSW__;__WXDEBUG__;_DEBUG;WIN32;STRICT"
 				StringPooling="true"
 				BasicRuntimeChecks="3"

win/audacity.sln

@@ -111,7 +111,9 @@ Global
 		{7AA41BED-41B0-427A-9148-DEA40549D158}.Unicode Release|Win32.ActiveCfg = Unicode Release|Win32
 		{7AA41BED-41B0-427A-9148-DEA40549D158}.Unicode Release|Win32.Build.0 = Unicode Release|Win32
 		{F00717F2-67C8-44E1-AF00-541DFA9CB7F2}.Unicode Debug|Win32.ActiveCfg = Unicode Debug|Win32
+		{F00717F2-67C8-44E1-AF00-541DFA9CB7F2}.Unicode Debug|Win32.Build.0 = Unicode Debug|Win32
 		{F00717F2-67C8-44E1-AF00-541DFA9CB7F2}.Unicode Release|Win32.ActiveCfg = Unicode Release|Win32
+		{F00717F2-67C8-44E1-AF00-541DFA9CB7F2}.Unicode Release|Win32.Build.0 = Unicode Release|Win32
 		{3DDDCAA9-276D-4FC3-A15C-485F7B9B24CC}.Unicode Debug|Win32.ActiveCfg = Unicode Debug|Win32
 		{3DDDCAA9-276D-4FC3-A15C-485F7B9B24CC}.Unicode Release|Win32.ActiveCfg = Unicode Release|Win32
 		{F4B4A272-4ED3-4951-A6EE-B7BAAC1C4952}.Unicode Debug|Win32.ActiveCfg = Unicode Debug|Win32

win/configwin.h

@@ -22,10 +22,14 @@
 // #define USE_LIBLRDF 1
 #define USE_LIBMAD 1
 
-// Resampling -- should build only one of these.
+// Resamplers
+// libsoxr is used for constant-rate resampling.
+#define USE_LIBSOXR 1
+// Should build only one of libresample or libsamplerate for variable-rate resampling, 
+// but if both are defined, USE_LIBRESAMPLE is used and USE_LIBSAMPLERATE is not.
+//vvvvv Turn back on after completing refactoring.
 #undef USE_LIBRESAMPLE 
 #undef USE_LIBSAMPLERATE
-#define USE_LIBSOXR 1
 
 #define USE_LIBTWOLAME 1
 #define USE_LIBVORBIS 1