C++ WaveTrack::Clear方法代码示例

bool EffectNoise::Process()
{
   if (noiseDuration <= 0.0)
      noiseDuration = sDefaultGenerateLen;

   //Iterate over each track
   TrackListIterator iter(mWaveTracks);
   WaveTrack *track = (WaveTrack *)iter.First();
   while (track) {
      WaveTrack *tmp = mFactory->NewWaveTrack(track->GetSampleFormat(), track->GetRate());
      numSamples = (longSampleCount)(noiseDuration * track->GetRate() + 0.5);
      longSampleCount i = 0;
      float *data = new float[tmp->GetMaxBlockSize()];
      sampleCount block;

      while(i < numSamples) {
         block = tmp->GetBestBlockSize(i);
         if (block > (numSamples - i))
             block = numSamples - i;

         MakeNoise(data, block, track->GetRate(), noiseAmplitude);

         tmp->Append((samplePtr)data, floatSample, block);
         i += block;
      }
      delete[] data;

      tmp->Flush();
      track->Clear(mT0, mT1);
      track->Paste(mT0, tmp);
      delete tmp;

      //Iterate to the next track
      track = (WaveTrack *)iter.Next();
   }

   /*
      save last used values
      save duration unless value was got from selection, so we save only
      when user explicitely setup a value
   */
   if (mT1 == mT0)
      gPrefs->Write(wxT("/CsPresets/NoiseGen_Duration"), noiseDuration);

   gPrefs->Write(wxT("/CsPresets/NoiseGen_Type"), noiseType);
   gPrefs->Write(wxT("/CsPresets/NoiseGen_Amp"), noiseAmplitude);

   mT1 = mT0 + noiseDuration; // Update selection.

   return true;
}

bool EffectToneGen::Process()
{
   if (length <= 0.0)
      length = sDefaultGenerateLen;

   //Iterate over each track
   TrackListIterator iter(mWaveTracks);
   WaveTrack *track = (WaveTrack *)iter.First();
   while (track) {
      mSample = 0;
      WaveTrack *tmp = mFactory->NewWaveTrack(track->GetSampleFormat());
      mCurRate = track->GetRate();
      tmp->SetRate(mCurRate);
      longSampleCount numSamples =
         (longSampleCount)(length * mCurRate + 0.5);
      longSampleCount i = 0;
      float *data = new float[tmp->GetMaxBlockSize()];
      sampleCount block;

      while(i < numSamples) {
         block = tmp->GetBestBlockSize(i);
         if (block > (numSamples - i))
             block = numSamples - i;
         MakeTone(data, block);
         tmp->Append((samplePtr)data, floatSample, block);
         i += block;
      }
      delete[] data;

      tmp->Flush();
      track->Clear(mT0, mT1);
      track->Paste(mT0, tmp);
      delete tmp;
      
      //Iterate to the next track
      track = (WaveTrack *)iter.Next();
   }

	mT1 = mT0 + length; // Update selection.

   return true;
}

bool EffectSilence::Process()
{
   if (length <= 0.0)
      length = sDefaultGenerateLen;

   TrackListIterator iter(mWaveTracks);
   WaveTrack *track = (WaveTrack *)iter.First();
   while (track) {
      WaveTrack *tmp = mFactory->NewWaveTrack(track->GetSampleFormat(), track->GetRate());
      tmp->InsertSilence(0.0, length);
      tmp->Flush();
      track->Clear(mT0, mT1);
      track->Paste(mT0, tmp);
      delete tmp;
      
      //Iterate to the next track
      track = (WaveTrack *)iter.Next();
   }

	mT1 = mT0 + length; // Update selection.
   return true;
}

bool Generator::Process()
{
   if (GetDuration() < 0.0)
      return false;


   // Set up mOutputTracks.
   // This effect needs Track::All for sync-lock grouping.
   this->CopyInputTracks(Track::All);

   // Iterate over the tracks
   bool bGoodResult = true;
   int ntrack = 0;
   TrackListIterator iter(mOutputTracks);
   Track* t = iter.First();

   while (t != NULL)
   {
      if (t->GetKind() == Track::Wave && t->GetSelected()) {
         WaveTrack* track = (WaveTrack*)t;

         bool editClipCanMove;
         gPrefs->Read(wxT("/GUI/EditClipCanMove"), &editClipCanMove, true);

         //if we can't move clips, and we're generating into an empty space,
         //make sure there's room.
         if (!editClipCanMove &&
             track->IsEmpty(mT0, mT1+1.0/track->GetRate()) &&
             !track->IsEmpty(mT0, mT0+GetDuration()-(mT1-mT0)-1.0/track->GetRate()))
         {
            wxMessageBox(
                  _("There is not enough room available to generate the audio"),
                  _("Error"), wxICON_STOP);
            Failure();
            return false;
         }

         if (GetDuration() > 0.0)
         {
            AudacityProject *p = GetActiveProject();
            // Create a temporary track
            std::unique_ptr<WaveTrack> tmp(
               mFactory->NewWaveTrack(track->GetSampleFormat(),
               track->GetRate())
            );
            BeforeTrack(*track);
            BeforeGenerate();

            // Fill it with data
            if (!GenerateTrack(&*tmp, *track, ntrack))
               bGoodResult = false;
            else {
               // Transfer the data from the temporary track to the actual one
               tmp->Flush();
               SetTimeWarper(new StepTimeWarper(mT0+GetDuration(), GetDuration()-(mT1-mT0)));
               bGoodResult = track->ClearAndPaste(p->GetSel0(), p->GetSel1(), &*tmp, true,
                     false, GetTimeWarper());
            }

            if (!bGoodResult) {
               Failure();
               return false;
            }
         }
         else
         {
            // If the duration is zero, there's no need to actually
            // generate anything
            track->Clear(mT0, mT1);
         }

         ntrack++;
      }
      else if (t->IsSyncLockSelected()) {
         t->SyncLockAdjust(mT1, mT0 + GetDuration());
      }
      // Move on to the next track
      t = iter.Next();
   }

   Success();

   this->ReplaceProcessedTracks(bGoodResult);

   mT1 = mT0 + GetDuration(); // Update selection.

   return true;
}

//------------------------- Processing methods -------------------------
bool EffectSineSweepGenerator::Process()
{
   // taken `as is` from Audacity`s Generator.cpp to resolve
   // a vc++ linking problem...
   
   if (mDuration < 0.0)
      return false;

   BeforeGenerate();

   // Set up mOutputTracks. This effect needs Track::All for grouping
   this->CopyInputTracks(Track::All);

   // Iterate over the tracks
   bool bGoodResult = true;
   int ntrack = 0;
   TrackListIterator iter(mOutputTracks);
   Track* t = iter.First();

   while (t != NULL)
   {
      if (t->GetKind() == Track::Wave && t->GetSelected()) 
      {
         WaveTrack* track = (WaveTrack*)t;
         
         bool editClipCanMove = true;
         //gPrefs->Read(wxT("/GUI/EditClipCanMove"), &editClipCanMove, true);

         //if we can't move clips, and we're generating into an empty space,
         //make sure there's room.
         if (!editClipCanMove &&
             track->IsEmpty(mT0, mT1+1.0/track->GetRate()) &&
             !track->IsEmpty(mT0, mT0+mDuration-(mT1-mT0)-1.0/track->GetRate()))
         {
             wxMessageBox(_("There is not enough room available to generate the audio"),
                          _("Error"), wxICON_STOP);   
            Failure();
            return false;
         }

         if (mDuration > 0.0)
         {
            // Create a temporary track
            WaveTrack *tmp = mFactory->NewWaveTrack(track->GetSampleFormat(),
                                                    track->GetRate());
            //BeforeTrack(*track);

            // Fill it with data
            if (!GenerateTrack(tmp, *track, ntrack))
               bGoodResult = false;
            else 
            {
               // Transfer the data from the temporary track to the actual one
               tmp->Flush();
               SetTimeWarper(new AFStepTimeWarper(mT0+mDuration, mDuration-(mT1-mT0)));
               bGoodResult = track->ClearAndPaste(mT0, mT1, tmp, true,
                     false, GetTimeWarper());
               delete tmp;
            }

            if (!bGoodResult) 
            {
               Failure();
               return false;
            }
         }
         else
         {
            // If the duration is zero, there's no need to actually
            // generate anything
            track->Clear(mT0, mT1);
         }

         ntrack++;
      }
      else if (t->IsSyncLockSelected()) 
      {
         t->SyncLockAdjust(mT1, mT0 + mDuration);
      }
      // Move on to the next track
      t = iter.Next();
   }

   Success();

   this->ReplaceProcessedTracks(bGoodResult);

   mT1 = mT0 + mDuration; // Update selection.

   return true;
}

//.........这里部分代码省略.........
                     buffer[tndx][truncIndex+fr] = ((mBlendFrameCount-fr)*buffer[tndx][truncIndex+fr] + fr*buffer[tndx][curOffset + fr]) / mBlendFrameCount;
                  }
                  // Append the 'keep' samples, if any
                  for ( ; fr < keep; fr++) {
                     buffer[tndx][truncIndex+fr] = buffer[tndx][curOffset + fr];
                  }
               }
               truncIndex += keep;
            }
            consecutiveSilentFrames = 0;
            ignoringFrames = false;
            truncToMinimum = false;
         }

         // Can get here either because > dbThreshold
         // or silence duration isn't longer than allowed
         for (tndx = 0; tndx < tcount; tndx++) {
            buffer[tndx][truncIndex] = buffer[tndx][i];
         }
         truncIndex++;
      }

      // Update tracks if any samples were removed, now or before
      if (outTrackOffset + truncIndex != index + limit) {
         // Put updated sample back into output tracks.
         tndx = 0;
         t = (WaveTrack *) iterOut.First();
         while (t) {
            t->Set((samplePtr)buffer[tndx++], floatSample, outTrackOffset, truncIndex);
            t = (WaveTrack *) iterOut.Next();
         }
      }

      // If currently in a silent section, retain samples for the next pass
      if(ignoringFrames) {
         keep = consecutiveSilentFrames - truncInitialAllowedSilentSamples;
         if(keep > (truncLongestAllowedSilentSamples+mBlendFrameCount))
            keep = truncLongestAllowedSilentSamples+mBlendFrameCount;
         for (tndx = 0; tndx < tcount; tndx++) {
            for(fr = 0; fr < truncInitialAllowedSilentSamples; fr++) {
               buffer[tndx][fr] = buffer[tndx][truncIndex-truncInitialAllowedSilentSamples+fr];
            }
            for(fr = 0; fr < keep; fr++) {
               buffer[tndx][truncInitialAllowedSilentSamples+fr] = buffer[tndx][i-keep+fr];
            }
         }
         // Update the output index, less what we are retaining for next time
         outTrackOffset += truncIndex - truncInitialAllowedSilentSamples;
         // Append the following buffer to the existing data
         i = consecutiveSilentFrames = truncInitialAllowedSilentSamples + keep;
         truncIndex = truncInitialAllowedSilentSamples;
      } else {
         // Maintain output index
         outTrackOffset += truncIndex;
         // Reset the buffer pointers to the beginning
         i = 0;
         truncIndex = 0;
         consecutiveSilentFrames = 0;
      }

      // Update progress and bail if user cancelled
      cancelled = TrackProgress(0, ((double)index / (double)end));
      if (cancelled) {
         break;
      }

      // Bump to next block
      index += count;
   }

   AudacityProject *p = GetActiveProject();
   if (!p)
      return false;

   // Remove stale data at end of output tracks.
   if (!cancelled && (outTrackOffset < end)) {
      t = (WaveTrack *) iterOut.First();
      if( p->IsSticky() )
         t->Clear(outTrackOffset / rate, t1, mOutputTracks);
      else
         while(t) {
            t->Clear(outTrackOffset / rate, t1, mOutputTracks);
            t = (WaveTrack *) iterOut.Next();
         }         

      t1 = outTrackOffset / rate;
   }

   // Free buffers
   for (tndx = 0; tndx < tcount; tndx++) {
      delete [] buffer[tndx];
   }
   delete [] buffer;

   mT0 = t0;
   mT1 = t1;

   this->ReplaceProcessedTracks(!cancelled); 
   return !cancelled;
}

bool EffectNoise::Process()
{
   if (noiseDuration <= 0.0)
      noiseDuration = sDefaultGenerateLen;

   //Iterate over each track
   int ntrack = 0;
   this->CopyInputWaveTracks(); // Set up mOutputWaveTracks.
   bool bGoodResult = true;

   TrackListIterator iter(mOutputWaveTracks);
   WaveTrack *track = (WaveTrack *)iter.First();
   while (track) {
      WaveTrack *tmp = mFactory->NewWaveTrack(track->GetSampleFormat(), track->GetRate());
      numSamples = (longSampleCount)(noiseDuration * track->GetRate() + 0.5);
      longSampleCount i = 0;
      float *data = new float[tmp->GetMaxBlockSize()];
      sampleCount block;

      while ((i < numSamples) && bGoodResult) {
         block = tmp->GetBestBlockSize(i);
         if (block > (numSamples - i))
             block = numSamples - i;

         MakeNoise(data, block, track->GetRate(), noiseAmplitude);

         tmp->Append((samplePtr)data, floatSample, block);
         i += block;

         //Update the Progress meter
         if (TrackProgress(ntrack, (double)i / numSamples))
            bGoodResult = false;
      }
      delete[] data;

      tmp->Flush();
      track->Clear(mT0, mT1);
      track->Paste(mT0, tmp);
      delete tmp;

      if (!bGoodResult)
         break;

      //Iterate to the next track
      ntrack++;
      track = (WaveTrack *)iter.Next();
   }

   if (bGoodResult)
   {
      /*
         save last used values
         save duration unless value was got from selection, so we save only
         when user explicitely setup a value
      */
      if (mT1 == mT0)
         gPrefs->Write(wxT("/CsPresets/NoiseGen_Duration"), noiseDuration);

      gPrefs->Write(wxT("/CsPresets/NoiseGen_Type"), noiseType);
      gPrefs->Write(wxT("/CsPresets/NoiseGen_Amp"), noiseAmplitude);

      mT1 = mT0 + noiseDuration; // Update selection.
   }

   this->ReplaceProcessedWaveTracks(bGoodResult); 
   return bGoodResult;
}

void ControlToolBar::OnRecord(wxCommandEvent &evt)
{
   if (gAudioIO->IsBusy()) {
      mRecord->PopUp();
      return;
   }
   AudacityProject *p = GetActiveProject();

   if( evt.GetInt() == 1 ) // used when called by keyboard shortcut. Default (0) ignored.
      mRecord->SetShift(true);
   if( evt.GetInt() == 2 )
      mRecord->SetShift(false);

   SetRecord(true, mRecord->WasShiftDown());

   if (p) {
      TrackList *t = p->GetTracks();
      TrackListIterator it(t);
      if(it.First() == NULL)
         mRecord->SetShift(false);
      double t0 = p->GetSel0();
      double t1 = p->GetSel1();
      if (t1 == t0)
         t1 = 1000000000.0;     // record for a long, long time (tens of years)

      /* TODO: set up stereo tracks if that is how the user has set up
       * their preferences, and choose sample format based on prefs */
      WaveTrackArray newRecordingTracks, playbackTracks;
#ifdef EXPERIMENTAL_MIDI_OUT
      NoteTrackArray midiTracks;
#endif
      bool duplex;
      gPrefs->Read(wxT("/AudioIO/Duplex"), &duplex, true);

      if(duplex){
         playbackTracks = t->GetWaveTrackArray(false);
#ifdef EXPERIMENTAL_MIDI_OUT
         midiTracks = t->GetNoteTrackArray(false);
#endif
     }
      else {
         playbackTracks = WaveTrackArray();
#ifdef EXPERIMENTAL_MIDI_OUT
         midiTracks = NoteTrackArray();
#endif
     }

      // If SHIFT key was down, the user wants append to tracks
      int recordingChannels = 0;
      bool shifted = mRecord->WasShiftDown();
      if (shifted) {
         bool sel = false;
         double allt0 = t0;

         // Find the maximum end time of selected and all wave tracks
         // Find whether any tracks were selected.  (If any are selected,
         // record only into them; else if tracks exist, record into all.)
         for (Track *tt = it.First(); tt; tt = it.Next()) {
            if (tt->GetKind() == Track::Wave) {
               WaveTrack *wt = static_cast<WaveTrack *>(tt);
               if (wt->GetEndTime() > allt0) {
                  allt0 = wt->GetEndTime();
               }

               if (tt->GetSelected()) {
                  sel = true;
                  if (wt->GetEndTime() > t0) {
                     t0 = wt->GetEndTime();
                  }
               }
            }
         }

         // Use end time of all wave tracks if none selected
         if (!sel) {
            t0 = allt0;
         }

         // Pad selected/all wave tracks to make them all the same length
         // Remove recording tracks from the list of tracks for duplex ("overdub")
         // playback.
         for (Track *tt = it.First(); tt; tt = it.Next()) {
            if (tt->GetKind() == Track::Wave && (tt->GetSelected() || !sel)) {
               WaveTrack *wt = static_cast<WaveTrack *>(tt);
               if (duplex)
                  playbackTracks.Remove(wt);
               t1 = wt->GetEndTime();
               if (t1 < t0) {
                  WaveTrack *newTrack = p->GetTrackFactory()->NewWaveTrack();
                  newTrack->InsertSilence(0.0, t0 - t1);
                  newTrack->Flush();
                  wt->Clear(t1, t0);
                  bool bResult = wt->Paste(t1, newTrack);
                  wxASSERT(bResult); // TO DO: Actually handle this.
                  delete newTrack;
               }
               newRecordingTracks.Add(wt);
            }
         }

//.........这里部分代码省略.........

void ControlToolBar::OnRecord(wxCommandEvent &evt)
{
   auto doubleClicked = mRecord->IsDoubleClicked();
   mRecord->ClearDoubleClicked();

   if (doubleClicked) {
      // Display a fixed recording head while scrolling the waves continuously.
      // If you overdub, you may want to anticipate some context in existing tracks,
      // so center the head.  If not, put it rightmost to display as much wave as we can.
      const auto project = GetActiveProject();
      bool duplex;
      gPrefs->Read(wxT("/AudioIO/Duplex"), &duplex, true);

      if (duplex) {
         // See if there is really anything being overdubbed
         if (gAudioIO->GetNumPlaybackChannels() == 0)
            // No.
            duplex = false;
      }

      using Mode = AudacityProject::PlaybackScroller::Mode;
      project->GetPlaybackScroller().Activate(duplex ? Mode::Centered : Mode::Right);
      return;
   }

   if (gAudioIO->IsBusy()) {
      if (!CanStopAudioStream() || 0 == gAudioIO->GetNumCaptureChannels())
         mRecord->PopUp();
      else
         mRecord->PushDown();
      return;
   }
   AudacityProject *p = GetActiveProject();

   if( evt.GetInt() == 1 ) // used when called by keyboard shortcut. Default (0) ignored.
      mRecord->SetShift(true);
   if( evt.GetInt() == 2 )
      mRecord->SetShift(false);

   SetRecord(true, mRecord->WasShiftDown());

   if (p) {
      TrackList *trackList = p->GetTracks();
      TrackListIterator it(trackList);
      if(it.First() == NULL)
         mRecord->SetShift(false);
      double t0 = p->GetSel0();
      double t1 = p->GetSel1();
      if (t1 == t0)
         t1 = 1000000000.0;     // record for a long, long time (tens of years)

      /* TODO: set up stereo tracks if that is how the user has set up
       * their preferences, and choose sample format based on prefs */
      WaveTrackArray newRecordingTracks, playbackTracks;
#ifdef EXPERIMENTAL_MIDI_OUT
      NoteTrackArray midiTracks;
#endif
      bool duplex;
      gPrefs->Read(wxT("/AudioIO/Duplex"), &duplex, true);

      if(duplex){
         playbackTracks = trackList->GetWaveTrackArray(false);
#ifdef EXPERIMENTAL_MIDI_OUT
         midiTracks = trackList->GetNoteTrackArray(false);
#endif
     }
      else {
         playbackTracks = WaveTrackArray();
#ifdef EXPERIMENTAL_MIDI_OUT
         midiTracks = NoteTrackArray();
#endif
     }

      // If SHIFT key was down, the user wants append to tracks
      int recordingChannels = 0;
      TrackList tracksCopy{};
      bool tracksCopied = false;
      bool shifted = mRecord->WasShiftDown();
      if (shifted) {
         bool sel = false;
         double allt0 = t0;

         // Find the maximum end time of selected and all wave tracks
         // Find whether any tracks were selected.  (If any are selected,
         // record only into them; else if tracks exist, record into all.)
         for (Track *tt = it.First(); tt; tt = it.Next()) {
            if (tt->GetKind() == Track::Wave) {
               WaveTrack *wt = static_cast<WaveTrack *>(tt);
               if (wt->GetEndTime() > allt0) {
                  allt0 = wt->GetEndTime();
               }

               if (tt->GetSelected()) {
                  sel = true;
                  if (wt->GetEndTime() > t0) {
                     t0 = wt->GetEndTime();
                  }
               }
            }
         }
//.........这里部分代码省略.........

//.........这里部分代码省略.........
      // Look for silences in current block
      for (sampleCount i = 0; i < limit; i++) {

         // Is current frame in all tracks below threshold
         bool below = true;
         for (tndx = 0; tndx < tcount; tndx++) {
            if (fabs(buffer[tndx][i]) >= truncDbSilenceThreshold) {
               below = false;
               break;
            }
         }

         // Count frame if it's below threshold
         if (below) {
            consecutiveSilentFrames++;

            // Ignore this frame (equivalent to cutting it)
            // otherwise, keep sample to be part of allowed silence
            if (consecutiveSilentFrames > truncLongestAllowedSilentSamples) {
               ignoringFrames = true;
               continue;
            }
         }
         else {
            if (ignoringFrames == true) {
               sampleCount curOffset = i - rampInFrames;
               truncIndex -= rampInFrames; // backup into ignored frames

               for (tndx = 0; tndx < tcount; tndx++) {
                  sampleCount trunci = truncIndex;
                  for (int fr = 0; fr < rampInFrames; fr++) {
                     buffer[tndx][trunci++] = buffer[tndx][curOffset + fr];
                  }
                  if(((trunci - rampInFrames) - mBlendFrameCount) >= 0) {
                     BlendFrames(buffer[tndx], mBlendFrameCount,
                             ((trunci - rampInFrames) - mBlendFrameCount), 
                             ((i - rampInFrames) - mBlendFrameCount));
                  }
               }
               truncIndex += rampInFrames;
            }
            consecutiveSilentFrames = 0;
            ignoringFrames = false;
         }

         // Can get here either because > dbThreshold
         // or silence duration isn't longer than allowed
         for (tndx = 0; tndx < tcount; tndx++) {
            buffer[tndx][truncIndex] = buffer[tndx][i];
         }
         truncIndex++;
      }

      // Update tracks if any samples were removed
      if (truncIndex < limit) {

         // Put updated sample back into output tracks.
         tndx = 0;
         t = (WaveTrack *) iterOut.First();
         while (t) {
            t->Set((samplePtr)buffer[tndx++], floatSample, outTrackOffset, truncIndex);
            t = (WaveTrack *) iterOut.Next();
         }
      }

      // Maintain output index
      outTrackOffset += truncIndex;

      // Update progress and bail if user cancelled
      cancelled = TrackProgress(0, ((double)index / (double)end));
      if (cancelled) {
         break;
      }

      // Bump to next block
      index += limit;
   }

   // Remove stale data at end of output tracks.
   if (!cancelled && (outTrackOffset < end)) {
      t = (WaveTrack *) iterOut.First();
      while (t) {
         t->Clear(outTrackOffset / rate, t1);
         t = (WaveTrack *) iterOut.Next();
      }
      t1 = outTrackOffset / rate;
   }

   // Free buffers
   for (tndx = 0; tndx < tcount; tndx++) {
      delete [] buffer[tndx];
   }
   delete [] buffer;

   mT0 = t0;
   mT1 = t1;

   this->ReplaceProcessedWaveTracks(!cancelled); 
   return !cancelled;
}

//.........这里部分代码省略.........
   for (rit = silences.rbegin(); rit != silences.rend(); ++rit) {
      Region *r = *rit;

      // Progress dialog and cancellation. Do additional cleanup before return.
      if (TotalProgress(detectFrac + (1 - detectFrac) * whichReg / (double)silences.size()))
      {
         ReplaceProcessedTracks(false);
         return false;
      }

      // Intersection may create regions smaller than allowed; ignore them.
      // Allow one nanosecond extra for consistent results with exact milliseconds of allowed silence.
      if ((r->end - r->start) < (mInitialAllowedSilence - 0.000000001))
         continue;

      // Find new silence length as requested
      double inLength = r->end - r->start;
      double outLength;

      switch (mProcessIndex) {
      case 0:
         outLength = wxMin(mTruncLongestAllowedSilence, inLength);
         break;
      case 1:
         outLength = mInitialAllowedSilence +
                        (inLength - mInitialAllowedSilence) * mSilenceCompressPercent / 100.0;
         break;
      default: // Not currently used.
         outLength = wxMin(mInitialAllowedSilence +
                              (inLength - mInitialAllowedSilence) * mSilenceCompressPercent / 100.0,
                           mTruncLongestAllowedSilence);
      }

      double cutLen = inLength - outLength;
      totalCutLen += cutLen;

      TrackListIterator iterOut(mOutputTracks);
      for (Track *t = iterOut.First(); t; t = iterOut.Next())
      {
         // Don't waste time past the end of a track
         if (t->GetEndTime() < r->start)
            continue;

         if (t->GetKind() == Track::Wave && (
                  t->GetSelected() || t->IsSyncLockSelected()))
         {
            // In WaveTracks, clear with a cross-fade
            WaveTrack *wt = (WaveTrack *)t;
            sampleCount blendFrames = mBlendFrameCount;
            double cutStart = (r->start + r->end - cutLen) / 2;
            double cutEnd = cutStart + cutLen;
            // Round start/end times to frame boundaries
            cutStart = wt->LongSamplesToTime(wt->TimeToLongSamples(cutStart));
            cutEnd = wt->LongSamplesToTime(wt->TimeToLongSamples(cutEnd));

            // Make sure the cross-fade does not affect non-silent frames
            if (wt->LongSamplesToTime(blendFrames) > inLength) {
               blendFrames = wt->TimeToLongSamples(inLength);
            }

            // Perform cross-fade in memory
            float *buf1 = new float[blendFrames];
            float *buf2 = new float[blendFrames];
            sampleCount t1 = wt->TimeToLongSamples(cutStart) - blendFrames / 2;
            sampleCount t2 = wt->TimeToLongSamples(cutEnd) - blendFrames / 2;

            wt->Get((samplePtr)buf1, floatSample, t1, blendFrames);
            wt->Get((samplePtr)buf2, floatSample, t2, blendFrames);

            for (sampleCount i = 0; i < blendFrames; ++i) {
               buf1[i] = ((blendFrames-i) * buf1[i] + i * buf2[i]) /
                         (double)blendFrames;
            }

            // Perform the cut
            wt->Clear(cutStart, cutEnd);

            // Write cross-faded data
            wt->Set((samplePtr)buf1, floatSample, t1, blendFrames);

            delete [] buf1;
            delete [] buf2;
         }
         else if (t->GetSelected() || t->IsSyncLockSelected())
         {
            // Non-wave tracks: just do a sync-lock adjust
            double cutStart = (r->start + r->end - cutLen) / 2;
            double cutEnd = cutStart + cutLen;
            t->SyncLockAdjust(cutEnd, cutStart);
         }
      }
      ++whichReg;
   }

   mT1 -= totalCutLen;

   ReplaceProcessedTracks(true);

   return true;
}

//.........这里部分代码省略.........
         numSamplesSilence += (diff/(dtmfNTones-1));
         diff = numSamplesSequence - (dtmfNTones*numSamplesTone) - (dtmfNTones-1)*numSamplesSilence;
      }
      // this var will be used as extra samples distributor
      int extra=0;

      longSampleCount i = 0;
      longSampleCount j = 0;
      int n=0; // pointer to string in dtmfString
      sampleCount block;
      bool isTone = true;
      float *data = new float[tmp->GetMaxBlockSize()];

      // for the whole dtmf sequence, we will be generating either tone or silence
      // according to a bool value, and this might be done in small chunks of size
      // 'block', as a single tone might sometimes be larger than the block
      // tone and silence generally have different duration, thus two generation blocks
      //
      // Note: to overcome a 'clicking' noise introduced by the abrupt transition from/to
      // silence, I added a fade in/out of 1/250th of a second (4ms). This can still be
      // tweaked but gives excellent results at 44.1kHz: I haven't tried other freqs.
      // A problem might be if the tone duration is very short (<10ms)... (?)
      //
      // One more problem is to deal with the approximations done when calculating the duration 
      // of both tone and silence: in some cases the final sum might not be same as the initial
      // duration. So, to overcome this, we had a redistribution block up, and now we will spread
      // the remaining samples in every bin in order to achieve the full duration: test case was
      // to generate an 11 tone DTMF sequence, in 4 seconds, and with DutyCycle=75%: after generation
      // you ended up with 3.999s or in other units: 3 seconds and 44097 samples.
      //
      while(i < numSamplesSequence) {
         if (isTone)
         // generate tone
         {
            // the statement takes care of extracting one sample from the diff bin and
            // adding it into the tone block until depletion
            extra=(diff-- > 0?1:0);
            for(j=0; j < numSamplesTone+extra; j+=block) {
               block = tmp->GetBestBlockSize(j);
               if (block > (numSamplesTone+extra - j))
                   block = numSamplesTone+extra - j;

               // generate the tone and append
               MakeDtmfTone(data, block, track->GetRate(), dtmfString[n], j, numSamplesTone);
               tmp->Append((samplePtr)data, floatSample, block);
            }
            i += numSamplesTone;
            n++;
            if(n>=dtmfNTones)break;
         }
         else
         // generate silence
         {
            // the statement takes care of extracting one sample from the diff bin and
            // adding it into the silence block until depletion
            extra=(diff-- > 0?1:0);
            for(j=0; j < numSamplesSilence+extra; j+=block) {
               block = tmp->GetBestBlockSize(j);
               if (block > (numSamplesSilence+extra - j))
                   block = numSamplesSilence+extra - j;

               // generate silence and append
               memset(data, 0, sizeof(float)*block);
               tmp->Append((samplePtr)data, floatSample, block);
            }
            i += numSamplesSilence;
         }
         // flip flag
         isTone=!isTone;
      } // finished the whole dtmf sequence

      delete[] data;

      tmp->Flush();
      track->Clear(mT0, mT1);
      track->Paste(mT0, tmp);
      delete tmp;

      //Iterate to the next track
      track = (WaveTrack *)iter.Next();
   }

   /*
      save last used values
      save duration unless value was got from selection, so we save only
      when user explicitely setup a value
   */
   if (mT1 == mT0)
      gPrefs->Write(wxT("/CsPresets/DtmfGen_SequenceDuration"), dtmfDuration);

   gPrefs->Write(wxT("/CsPresets/DtmfGen_String"), dtmfString);
   gPrefs->Write(wxT("/CsPresets/DtmfGen_DutyCycle"), dtmfDutyCycle);

   // Update selection: this is not accurate if my calculations are wrong.
   // To validate, once the effect is done, unselect, and select all, then
   // see what the selection length is being reported (in sec,ms,samples)
   mT1 = mT0 + dtmfDuration;

   return true;
}

//.........这里部分代码省略.........
         // Find the maximum end time of selected and all wave tracks
         for (Track *tt = it.First(); tt; tt = it.Next()) {
            if (tt->GetKind() == Track::Wave) {
               wt = (WaveTrack *)tt;
               if (wt->GetEndTime() > allt0) {
                  allt0 = wt->GetEndTime();
               }
            
               if (tt->GetSelected()) {
                  sel = true;
                  if (duplex)
                     playbackTracks.Remove(wt);
                  if (wt->GetEndTime() > t0) {
                     t0 = wt->GetEndTime();
                  }
               }
            }
         }

         // Use end time of all wave tracks if none selected
         if (!sel) {
            t0 = allt0;
         }

         // Pad selected/all wave tracks to make them all the same length
         for (Track *tt = it.First(); tt; tt = it.Next()) {
            if (tt->GetKind() == Track::Wave && (tt->GetSelected() || !sel)) {
               wt = (WaveTrack *)tt;
               t1 = wt->GetEndTime();
               if (t1 < t0) {
                  WaveTrack *newTrack = p->GetTrackFactory()->NewWaveTrack();
                  newTrack->InsertSilence(0.0, t0 - t1);
                  newTrack->Flush();
                  wt->Clear(t1, t0);
                  wt->Paste(t1, newTrack);
                  delete newTrack;
               }
               newRecordingTracks.Add(wt);
            }
         }

         t1 = 1000000000.0;     // record for a long, long time (tens of years)
      }
      else {
         recordingChannels = gPrefs->Read(wxT("/AudioIO/RecordChannels"), 2);
         for (int c = 0; c < recordingChannels; c++) {
            WaveTrack *newTrack = p->GetTrackFactory()->NewWaveTrack();

            int initialheight = newTrack->GetHeight();

            newTrack->SetOffset(t0);

            if (recordingChannels <= 2) {
               newTrack->SetHeight(initialheight/recordingChannels);
            }
            else {
               newTrack->SetMinimized(true);
            }

            if (recordingChannels == 2) {
               if (c == 0) {
                  newTrack->SetChannel(Track::LeftChannel);
                  newTrack->SetLinked(true);
               }
               else {
                  newTrack->SetChannel(Track::RightChannel);