Bug 2367 - Change Pitch effect may create spurious clip at end

Fixes residual mentioned in Comment #11

src/effects/ChangePitch.cpp

@@ -207,7 +207,6 @@ bool EffectChangePitch::LoadFactoryDefaults()
 
 bool EffectChangePitch::Init()
 {
-   mSoundTouch.reset();
    return true;
 }
 
@@ -230,9 +229,11 @@ bool EffectChangePitch::Process()
       // ensure that m_dSemitonesChange is set.
       Calc_SemitonesChange_fromPercentChange();
 
-      mSoundTouch = std::make_unique<soundtouch::SoundTouch>();
+      auto initer = [&](soundtouch::SoundTouch *soundtouch)
+      {
+         soundtouch->setPitchSemiTones((float)(m_dSemitonesChange));
+      };
       IdentityTimeWarper warper;
-      mSoundTouch->setPitchSemiTones((float)(m_dSemitonesChange));
 #ifdef USE_MIDI
       // Pitch shifting note tracks is currently only supported by SoundTouchEffect
       // and non-real-time-preview effects require an audio track selection.
@@ -246,7 +247,7 @@ bool EffectChangePitch::Process()
       // eliminate the next line:
       mSemitones = m_dSemitonesChange;
 #endif
-      return EffectSoundTouch::ProcessWithTimeWarper(warper);
+      return EffectSoundTouch::ProcessWithTimeWarper(initer, warper);
    }
 }
 

src/effects/ChangeSpeed.cpp

@@ -553,7 +553,7 @@ bool EffectChangeSpeed::ProcessOne(WaveTrack * track,
    {
       LinearTimeWarper warper { mCurT0, mCurT0, mCurT1, mCurT0 + newLength };
       track->ClearAndPaste(
-         mCurT0, mCurT1, outputTrack.get(), false, true, &warper);
+         mCurT0, mCurT1, outputTrack.get(), true, false, &warper);
    }
 
    if (newLength > mMaxNewLength)

src/effects/ChangeTempo.cpp

@@ -191,8 +191,6 @@ bool EffectChangeTempo::Init()
    m_FromLength = mT1 - mT0;
    m_ToLength = (m_FromLength * 100.0) / (100.0 + m_PercentChange);
 
-   mSoundTouch.reset();
-
    return true;
 }
 
@@ -212,12 +210,14 @@ bool EffectChangeTempo::Process()
    else
 #endif
    {
-      mSoundTouch = std::make_unique<soundtouch::SoundTouch>();
-      mSoundTouch->setTempoChange(m_PercentChange);
+      auto initer = [&](soundtouch::SoundTouch *soundtouch)
+      {
+         soundtouch->setTempoChange(m_PercentChange);
+      };
       double mT1Dashed = mT0 + (mT1 - mT0)/(m_PercentChange/100.0 + 1.0);
       RegionTimeWarper warper{ mT0, mT1,
          std::make_unique<LinearTimeWarper>(mT0, mT0, mT1, mT1Dashed )  };
-      success = EffectSoundTouch::ProcessWithTimeWarper(warper);
+      success = EffectSoundTouch::ProcessWithTimeWarper(initer, warper);
    }
 
    if(success)

src/effects/SoundTouchEffect.cpp

@@ -67,7 +67,7 @@ bool EffectSoundTouch::ProcessNoteTrack(NoteTrack *nt, const TimeWarper &warper)
 }
 #endif
 
-bool EffectSoundTouch::ProcessWithTimeWarper(const TimeWarper &warper)
+bool EffectSoundTouch::ProcessWithTimeWarper(InitFunction initer, const TimeWarper &warper)
 {
    // Assumes that mSoundTouch has already been initialized
    // by the subclass for subclass-specific parameters. The
@@ -118,6 +118,8 @@ bool EffectSoundTouch::ProcessWithTimeWarper(const TimeWarper &warper)
 
          // Process only if the right marker is to the right of the left marker
          if (mCurT1 > mCurT0) {
+            mSoundTouch = std::make_unique<soundtouch::SoundTouch>();
+            initer(mSoundTouch.get());
 
             // TODO: more-than-two-channels
             auto channels = TrackList::Channels(leftTrack);
@@ -158,6 +160,8 @@ bool EffectSoundTouch::ProcessWithTimeWarper(const TimeWarper &warper)
                if (!ProcessOne(leftTrack, start, end, warper))
                   bGoodResult = false;
             }
+
+            mSoundTouch.reset();
          }
          mCurTrackNum++;
       },

src/effects/SoundTouchEffect.h

@@ -48,7 +48,8 @@ public:
 protected:
    // Effect implementation
 
-   bool ProcessWithTimeWarper(const TimeWarper &warper);
+   using InitFunction = std::function< void(soundtouch::SoundTouch *soundtouch) >;
+   bool ProcessWithTimeWarper(InitFunction initer, const TimeWarper &warper);
 
    std::unique_ptr<soundtouch::SoundTouch> mSoundTouch;
    double mCurT0;