Method Process

libraries/lib-builtin-effects/ChangeSpeedBase.cpp:128–223

}

bool ChangeSpeedBase::Process(EffectInstance&, EffectSettings&)
{
   // Similar to SoundTouchBase::Process()

   // Iterate over each track.
   // All needed because this effect needs to introduce
   // silence in the sync-lock group tracks to keep sync
   EffectOutputTracks outputs { *mTracks, GetType(), { { mT0, mT1 } }, true };
   bool bGoodResult = true;

   mCurTrackNum = 0;

   mFactor = 100.0 / (100.0 + m_PercentChange);

   outputs.Get().Any().VisitWhile(
      bGoodResult,
      [&](LabelTrack& lt) {
         if (SyncLock::IsSelectedOrSyncLockSelected(lt))
         {
            if (!ProcessLabelTrack(&lt))
               bGoodResult = false;
         }
      },
      [&](auto&& fallthrough) {
         return [&](WaveTrack& outWaveTrack) {
            if (!outWaveTrack.GetSelected())
               return fallthrough();

            // Get start and end times from track
            mCurT0 = outWaveTrack.GetStartTime();
            mCurT1 = outWaveTrack.GetEndTime();

            // Set the current bounds to whichever left marker is
            // greater and whichever right marker is less:
            mCurT0 = std::max(mT0, mCurT0);
            mCurT1 = std::min(mT1, mCurT1);

            // Process only if the right marker is to the right of the left
            // marker
            if (mCurT1 > mCurT0)
            {
               // Transform the marker timepoints to samples
               auto start = outWaveTrack.TimeToLongSamples(mCurT0);
               auto end = outWaveTrack.TimeToLongSamples(mCurT1);

               const auto gaps = FindGaps(outWaveTrack, mCurT0, mCurT1);

               auto pNewTrack = outWaveTrack.EmptyCopy();
               auto iter = pNewTrack->Channels().begin();
               for (const auto pChannel : outWaveTrack.Channels())
               {
                  // ProcessOne() (implemented below) processes a single channel
                  if (ProcessOne(*pChannel, **iter++, start, end))
                     ++mCurTrackNum;
                  else
                  {
                     pNewTrack.reset();
                     break;