Method Process

libraries/lib-vst3/VST3Wrapper.cpp:860–946

}

size_t VST3Wrapper::Process(const float* const* inBlock, float* const* outBlock, size_t blockLen)
{
   using namespace Steinberg;
   
   InputParameterChanges inputParameterChanges(mParameters, mParameterQueues.get());
   mParameters.clear();

   Vst::ProcessData data;
   data.processMode = mSetup.processMode;
   data.symbolicSampleSize = mSetup.symbolicSampleSize;
   data.inputParameterChanges = &inputParameterChanges;
   data.processContext = &mProcessContext;

   static_assert(std::numeric_limits<decltype(blockLen)>::max()
      >= std::numeric_limits<decltype(data.numSamples)>::max());

   data.numSamples = static_cast<decltype(data.numSamples)>(std::min(
      blockLen, 
      static_cast<decltype(blockLen)>(mSetup.maxSamplesPerBlock)
   ));

   data.numInputs = inBlock == nullptr ? 0 : mEffectComponent->getBusCount(Vst::kAudio, Vst::kInput);
   data.numOutputs = outBlock == nullptr ? 0 : mEffectComponent->getBusCount(Vst::kAudio, Vst::kOutput);

   if(data.numInputs > 0)
   {
      int inputBlocksOffset {0};

      data.inputs = static_cast<Vst::AudioBusBuffers*>(
         alloca(sizeof(Vst::AudioBusBuffers) * data.numInputs));

      for(int busIndex = 0; busIndex < data.numInputs; ++busIndex)
      {
         Vst::BusInfo busInfo { };
         if(mEffectComponent->getBusInfo(Vst::kAudio, Vst::kInput, busIndex, busInfo) != kResultOk)
         {
            return 0;
         }
         if(busInfo.busType == Vst::kMain)
         {
            data.inputs[busIndex].numChannels = busInfo.channelCount;
            data.inputs[busIndex].channelBuffers32 = const_cast<float**>(inBlock + inputBlocksOffset);
            inputBlocksOffset += busInfo.channelCount;
         }
         else
         {
            //aux is not yet supported
            data.inputs[busIndex].numChannels = 0;
            data.inputs[busIndex].channelBuffers32 = nullptr;
         }
         data.inputs[busIndex].silenceFlags = 0UL;
      }
   }
   if(data.numOutputs > 0)
   {
      int outputBlocksOffset {0};

      data.outputs = static_cast<Vst::AudioBusBuffers*>(