Method Process

Source/SampleCanvas.cpp:86–138

}

void SampleCanvas::Process(double time)
{
   PROFILER(SampleCanvas);

   IAudioReceiver* target = GetTarget();

   if (!mEnabled || target == nullptr)
      return;

   float canvasPos = GetCurPos(time);

   mCanvas->SetCursorPos(canvasPos);

   int bufferSize = target->GetBuffer()->BufferSize();
   assert(bufferSize == gBufferSize);

   gWorkChannelBuffer.Clear();

   const std::vector<CanvasElement*>& elements = mCanvas->GetElements();
   for (int elemIdx = 0; elemIdx < elements.size(); ++elemIdx)
   {
      SampleCanvasElement* element = static_cast<SampleCanvasElement*>(elements[elemIdx]);
      Sample* clip = element->GetSample();
      float vol = element->GetVolume();
      if (clip == nullptr || element->IsMuted())
         continue;

      for (int i = 0; i < bufferSize; ++i)
      {
         float sampleIndex = 0;

         float pos = GetCurPos(time + i * gInvSampleRateMs);

         sampleIndex = ofMap(pos, element->GetStart(), element->GetEnd(), 0, clip->LengthInSamples());

         if (sampleIndex >= 0 && sampleIndex < clip->LengthInSamples())
         {
            for (int ch = 0; ch < target->GetBuffer()->NumActiveChannels(); ++ch)
            {
               int sampleChannel = MAX(ch, clip->NumChannels() - 1);
               gWorkChannelBuffer.GetChannel(ch)[i] += GetInterpolatedSample(sampleIndex, clip->Data()->GetChannel(sampleChannel), clip->LengthInSamples()) * vol;
            }
         }
      }
   }

   for (int ch = 0; ch < target->GetBuffer()->NumActiveChannels(); ++ch)
   {
      ChannelBuffer* out = GetTarget()->GetBuffer();
      Add(out->GetChannel(ch), gWorkChannelBuffer.GetChannel(ch), gBufferSize);
      GetVizBuffer()->WriteChunk(gWorkChannelBuffer.GetChannel(ch), gBufferSize, ch);
   }
}

double SampleCanvas::GetCurPos(double time) const
{