Method ProcessAudio

Source/Stutter.cpp:51–114

}

void Stutter::ProcessAudio(double time, ChannelBuffer* buffer)
{
   PROFILER(Stutter);

   float bufferSize = buffer->BufferSize();

   mRecordBuffer.SetNumChannels(buffer->NumActiveChannels());
   mStutterBuffer.SetNumActiveChannels(buffer->NumActiveChannels());

   for (int ch = 0; ch < buffer->NumActiveChannels(); ++ch)
      mRecordBuffer.WriteChunk(buffer->GetChannel(ch), bufferSize, ch);

   if (mBlendRamp.Target(time) > 0 || mBlendRamp.Value(time) > 0)
   {
      if (mCurrentStutter.interval == kInterval_None)
      {
         mStutterLengthRamp.Start(time, mFreeStutterLength * gSampleRate, time + 20);
         mStutterSpeed.Start(time, mFreeStutterSpeed, time + 20);
      }

      for (int i = 0; i < bufferSize; ++i)
      {
         if (mCurrentStutter.interval != kInterval_None)
            mStutterLength = int(TheTransport->GetDuration(mCurrentStutter.interval) / 1000 * gSampleRate);
         else
            mStutterLength = int(mStutterLengthRamp.Value(time));

         float offset = mStutterPos;
         if (offset > mStutterLength)
            offset -= mStutterLength;
         int pos = int(offset);
         int posNext = int(offset + 1) % mStutterLength;
         float a = offset - pos;

         for (int ch = 0; ch < buffer->NumActiveChannels(); ++ch)
         {
            float sample = GetStutterSampleWithWraparoundBlend(pos, ch);
            float nextSample = GetStutterSampleWithWraparoundBlend(posNext, ch);
            float stutterOut = (1 - a) * sample + a * nextSample; //interpolate

            float fade = 1;
            if (mFadeStutter)
               fade -= (offset / mStutterLength) * (offset / mStutterLength);

            float blend = mBlendRamp.Value(time);

            buffer->GetChannel(ch)[i] = stutterOut * blend * fade + buffer->GetChannel(ch)[i] * (1 - blend);
            buffer->GetChannel(ch)[i] = mJumpBlender[ch].Process(buffer->GetChannel(ch)[i], i);
         }

         //TODO(Ryan) what was this for?
         //if (blend == 0 && mBlendRamp.Target() == 0)
         //   break;

         mStutterPos += mStutterSpeed.Value(time);
         if (mStutterPos > mStutterLength)
            mStutterPos -= mStutterLength;
         if (mStutterPos < 0)