Method Commit

libraries/lib-effects/EffectOutputTracks.cpp:103–167

Replace tracks with successfully processed mOutputTracks copies. Else clear and delete mOutputTracks copies.

// Replace tracks with successfully processed mOutputTracks copies.
// Else clear and delete mOutputTracks copies.
void EffectOutputTracks::Commit()
{
   if (!mOutputTracks) {
      // Already committed, violating precondition.  Maybe wrong intent...
      assert(false);
      // ... but harmless
      return;
   }

   size_t cnt = mOMap.size();
   size_t i = 0;

   while (!mOutputTracks->empty()) {
      const auto pOutputTrack = *mOutputTracks->begin();

      // If tracks were removed from mOutputTracks, then there will be
      // tracks in the map that must be removed from mTracks.
      while (i < cnt && mOMap[i] != pOutputTrack) {
         const auto t = mIMap[i];
         // Class invariant justifies the assertion
         assert(t);
         ++i;
         mTracks.Remove(*t);
      }

      // The output track, still in the list, must also have been placed in
      // the map
      assert(i < cnt);

      // Find the input track it corresponds to
      if (!mIMap[i])
         // This track was an addition to output tracks; add it to mTracks
         mTracks.AppendOne(std::move(*mOutputTracks));
      else if (
         mEffectType != EffectTypeNone && mEffectType != EffectTypeAnalyze)
         // Replace mTracks entry with the new track
         mTracks.ReplaceOne(*mIMap[i], std::move(*mOutputTracks));
      else
         // This output track was just a placeholder for pre-processing. Discard
         // it.
         mOutputTracks->Remove(*pOutputTrack);
      ++i;
   }

   // If tracks were removed from mOutputTracks, then there may be tracks
   // left at the end of the map that must be removed from mTracks.
   while (i < cnt) {
      const auto t = mIMap[i];
      // Class invariant justifies the assertion
      assert(t);
      ++i;
      mTracks.Remove(*t);
   }

   // Reset map
   mIMap.clear();
   mOMap.clear();