Method ProcessOne

libraries/lib-builtin-effects/PaulstretchBase.cpp:185–351

}

bool PaulstretchBase::ProcessOne(
   const WaveChannel& track, WaveChannel& outputTrack, double t0, double t1,
   int count)
{
   const auto badAllocMessage = XO("Requested value exceeds memory capacity.");

   const auto rate = track.GetTrack().GetRate();
   const auto stretch_buf_size = GetBufferSize(rate);
   if (stretch_buf_size == 0)
   {
      BasicUI::ShowMessageBox(badAllocMessage);
      return {};
   }

   double amount = this->mAmount;

   auto start = track.TimeToLongSamples(t0);
   auto end = track.TimeToLongSamples(t1);
   auto len = end - start;

   const auto minDuration = stretch_buf_size * 2 + 1;
   if (minDuration < stretch_buf_size)
   {
      // overflow!
      BasicUI::ShowMessageBox(badAllocMessage);
      return {};
   }

   if (len < minDuration)
   { // error because the selection is too short

      float maxTimeRes = log(len.as_double()) / log(2.0);
      maxTimeRes = pow(2.0, floor(maxTimeRes) + 0.5);
      maxTimeRes = maxTimeRes / rate;

      using namespace BasicUI;
      if (this->IsPreviewing())
      {
         double defaultPreviewLen;
         gPrefs->Read(
            wxT("/AudioIO/EffectsPreviewLen"), &defaultPreviewLen, 6.0);

         if ((minDuration / mProjectRate) < defaultPreviewLen)
         {
            ShowMessageBox(
               /* i18n-hint: 'Time Resolution' is the name of a control in the
                  Paulstretch effect.*/
               XO("Audio selection too short to preview.\n\n"
                  "Try increasing the audio selection to at least %.1f seconds,\n"
                  "or reducing the 'Time Resolution' to less than %.1f seconds.")
                  .Format(
                     (minDuration / rate) + 0.05, // round up to 1/10 s.
                     floor(maxTimeRes * 10.0) / 10.0),
               MessageBoxOptions {}.IconStyle(Icon::Warning));
         }
         else
         {
            ShowMessageBox(