Method CrossFadeMix

src/CrossFade.cpp:59–286

}

bool CrossFader::CrossFadeMix(samplePtr buffer, sampleFormat format, sampleCount start, size_t len)
{

   std::cout << "Crossfading from " << start.as_long_long()
      << " to " << ( len + start ).as_long_long()
      << std::endl;

   // start refers to the position in the wave.


   //just mix the right things together.


   //For each relevant clip, we need to construct a buffer.
   //we should use one of the size len, because this has already
   //been determined to be good in Mixer

   //Go through each clip, adding it to the total in the appropriate way.

   //this could be 'optimized' by getting all of the sequences and then
   //iterating through each of them.

   int numclips = mClips.size();

   //create vectors to store the important info for each clip.
   std::vector<sampleCount> clipStart(numclips);
   std::vector<sampleCount> clipLength(numclips);
   std::vector<Sequence*> tmpSequence(numclips);


   unsigned int i = 0;
   //Now, go through the clips and load up the vectors.
   for(const auto &tmpclip: mClips)
   {
      tmpSequence[i] = tmpclip->GetSequence();


      //start is the position of the beginning of the buffer
      //relative to the beginning of the clip.  It could be negative.
      clipStart[i]= start - tmpclip->GetStartSample();



      //determine the index of the last sample to get, relative to the start of the clip

      //it will be no longer than  the clip itself.
      clipLength[i] = tmpclip->GetNumSamples()-clipStart[i];

      std::cout << "X:" <<  " "
         << clipLength[i].as_long_long()
         << "  "
         << tmpclip->GetStartSample().as_long_long()
         <<  " ";
      //if the buffer ends before the clip does, adjust the length
      if(clipStart[i] + len   < clipLength[i])
      {
         clipLength[i] = len  +  clipStart[i];
      }