Method Finalize

libraries/lib-builtin-effects/SoundTouchBase.cpp:374–431

}

void SoundTouchBase::Finalize(
   WaveTrack &orig, WaveTrack &out, const TimeWarper &warper)
{
   assert(out.NChannels() == orig.NChannels());
   if (mPreserveLength) {
      auto newLen = out.GetVisibleSampleCount();
      auto oldLen = out.TimeToLongSamples(mT1) - out.TimeToLongSamples(mT0);

      // Pad output track to original length since SoundTouch may remove samples
      if (newLen < oldLen) {
         const auto t = out.LongSamplesToTime(newLen - 1);
         const auto len = out.LongSamplesToTime(oldLen - newLen);
         out.InsertSilence(t, len);
      }
      // Trim output track to original length since SoundTouch may add extra samples
      else if (newLen > oldLen) {
         const auto t1 = out.LongSamplesToTime(oldLen);
         out.Trim(0, t1);
      }
   }

   // Silenced samples will be inserted in gaps between clips, so capture where
   // these gaps are for later deletion
   std::vector<std::pair<double, double>> gaps;
   double last = mT0;
   auto clips = orig.SortedIntervalArray();
   auto front = clips.front();
   auto back = clips.back();
   for (auto &clip : clips) {
      auto st = clip->GetPlayStartTime();
      auto et = clip->GetPlayEndTime();

      if (st >= mT0 || et < mT1) {
         if (mT0 < st && clip == front) {
            gaps.push_back(std::make_pair(mT0, st));
         }
         else if (last < st && mT0 <= last ) {
            gaps.push_back(std::make_pair(last, st));
         }

         if (et < mT1 && clip == back) {
            gaps.push_back(std::make_pair(et, mT1));
         }
      }
      last = et;
   }

   // Take the output track and insert it in place of the original sample data
   orig.ClearAndPaste(mT0, mT1, out, true, true, &warper);

   // Finally, recreate the gaps
   for (auto gap : gaps) {
      const auto st = orig.SnapToSample(gap.first);
      const auto et = orig.SnapToSample(gap.second);
      if (st >= mT0 && et <= mT1 && st != et)
         orig.SplitDelete(warper.Warp(st), warper.Warp(et));
   }
}