IPlugAPP_host.cpp

/*
 ==============================================================================
 
 This file is part of the iPlug 2 library. Copyright (C) the iPlug 2 developers. 
 
 See LICENSE.txt for  more info.
 
 ==============================================================================
*/
 
#include "IPlugAPP_host.h"
 
#ifdef OS_WIN
#include <sys/stat.h>
#endif
 
#include "IPlugLogger.h"
 
using namespace iplug;
 
#ifndef MAX_PATH_LEN
#define MAX_PATH_LEN 2048
#endif
 
#define STRBUFSZ 100
 
std::unique_ptr<IPlugAPPHost> IPlugAPPHost::sInstance;
UINT gSCROLLMSG;
 
IPlugAPPHost::IPlugAPPHost()
: mIPlug(MakePlug(InstanceInfo{this}))
{
}
 
IPlugAPPHost::~IPlugAPPHost()
{
  mExiting = true;
  
  CloseAudio();
  
  if (mMidiIn)
    mMidiIn->cancelCallback();
 
  if (mMidiOut)
    mMidiOut->closePort();
}
 
//static
IPlugAPPHost* IPlugAPPHost::Create()
{
  sInstance = std::make_unique<IPlugAPPHost>();
  return sInstance.get();
}
 
bool IPlugAPPHost::Init()
{
  mIPlug->SetHost("standalone", mIPlug->GetPluginVersion(false));
    
  if (!InitState())
    return false;
  
  TryToChangeAudioDriverType(); // will init RTAudio with an API type based on gState->mAudioDriverType
  ProbeAudioIO(); // find out what audio IO devs are available and put their IDs in the global variables gAudioInputDevs / gAudioOutputDevs
  InitMidi(); // creates RTMidiIn and RTMidiOut objects
  ProbeMidiIO(); // find out what midi IO devs are available and put their names in the global variables gMidiInputDevs / gMidiOutputDevs
  SelectMIDIDevice(ERoute::kInput, mState.mMidiInDev.Get());
  SelectMIDIDevice(ERoute::kOutput, mState.mMidiOutDev.Get());
  
  mIPlug->OnParamReset(kReset);
  mIPlug->OnActivate(true);
  
  return true;
}
 
bool IPlugAPPHost::OpenWindow(HWND pParent)
{
  return mIPlug->OpenWindow(pParent) != nullptr;
}
 
void IPlugAPPHost::CloseWindow()
{
  mIPlug->CloseWindow();
}
 
bool IPlugAPPHost::InitState()
{
#if defined OS_WIN
  TCHAR strPath[MAX_PATH_LEN];
  SHGetFolderPathA( NULL, CSIDL_LOCAL_APPDATA, NULL, 0, strPath );
  mINIPath.SetFormatted(MAX_PATH_LEN, "%s\\%s\\", strPath, BUNDLE_NAME);
#elif defined OS_MAC
  mINIPath.SetFormatted(MAX_PATH_LEN, "%s/Library/Application Support/%s/", getenv("HOME"), BUNDLE_NAME);
#else
  #error NOT IMPLEMENTED
#endif
 
  struct stat st;
 
  if (stat(mINIPath.Get(), &st) == 0) // if directory exists
  {
    mINIPath.Append("settings.ini"); // add file name to path
 
    char buf[STRBUFSZ];
    
    if (stat(mINIPath.Get(), &st) == 0) // if settings file exists read values into state
    {
      DBGMSG("Reading ini file from %s\n", mINIPath.Get());
      
      mState.mAudioDriverType = GetPrivateProfileInt("audio", "driver", 0, mINIPath.Get());
 
      GetPrivateProfileString("audio", "indev", "Built-in Input", buf, STRBUFSZ, mINIPath.Get()); mState.mAudioInDev.Set(buf);
      GetPrivateProfileString("audio", "outdev", "Built-in Output", buf, STRBUFSZ, mINIPath.Get()); mState.mAudioOutDev.Set(buf);
 
      //audio
      mState.mAudioInChanL = GetPrivateProfileInt("audio", "in1", 1, mINIPath.Get()); // 1 is first audio input
      mState.mAudioInChanR = GetPrivateProfileInt("audio", "in2", 2, mINIPath.Get());
      mState.mAudioOutChanL = GetPrivateProfileInt("audio", "out1", 1, mINIPath.Get()); // 1 is first audio output
      mState.mAudioOutChanR = GetPrivateProfileInt("audio", "out2", 2, mINIPath.Get());
      //mState.mAudioInIsMono = GetPrivateProfileInt("audio", "monoinput", 0, mINIPath.Get());
 
      mState.mBufferSize = GetPrivateProfileInt("audio", "buffer", 512, mINIPath.Get());
      mState.mAudioSR = GetPrivateProfileInt("audio", "sr", 44100, mINIPath.Get());
 
      //midi
      GetPrivateProfileString("midi", "indev", "no input", buf, STRBUFSZ, mINIPath.Get()); mState.mMidiInDev.Set(buf);
      GetPrivateProfileString("midi", "outdev", "no output", buf, STRBUFSZ, mINIPath.Get()); mState.mMidiOutDev.Set(buf);
 
      mState.mMidiInChan = GetPrivateProfileInt("midi", "inchan", 0, mINIPath.Get()); // 0 is any
      mState.mMidiOutChan = GetPrivateProfileInt("midi", "outchan", 0, mINIPath.Get()); // 1 is first chan
    }
 
    // if settings file doesn't exist, populate with default values, otherwise overwrite
    UpdateINI();
  }
  else // folder doesn't exist - make folder and make file
  {
#if defined OS_WIN
    // folder doesn't exist - make folder and make file
    CreateDirectory(mINIPath.Get(), NULL);
    mINIPath.Append("settings.ini");
    UpdateINI(); // will write file if doesn't exist
#elif defined OS_MAC
    mode_t process_mask = umask(0);
    int result_code = mkdir(mINIPath.Get(), S_IRWXU | S_IRWXG | S_IRWXO);
    umask(process_mask);
 
    if (!result_code)
    {
      mINIPath.Append("settings.ini");
      UpdateINI(); // will write file if doesn't exist
    }
    else
    {
      return false;
    }
#else
  #error NOT IMPLEMENTED
#endif
  }
 
  return true;
}
 
void IPlugAPPHost::UpdateINI()
{
  char buf[STRBUFSZ]; // temp buffer for writing integers to profile strings
  const char* ini = mINIPath.Get();
 
  sprintf(buf, "%u", mState.mAudioDriverType);
  WritePrivateProfileString("audio", "driver", buf, ini);
 
  WritePrivateProfileString("audio", "indev", mState.mAudioInDev.Get(), ini);
  WritePrivateProfileString("audio", "outdev", mState.mAudioOutDev.Get(), ini);
 
  sprintf(buf, "%u", mState.mAudioInChanL);
  WritePrivateProfileString("audio", "in1", buf, ini);
  sprintf(buf, "%u", mState.mAudioInChanR);
  WritePrivateProfileString("audio", "in2", buf, ini);
  sprintf(buf, "%u", mState.mAudioOutChanL);
  WritePrivateProfileString("audio", "out1", buf, ini);
  sprintf(buf, "%u", mState.mAudioOutChanR);
  WritePrivateProfileString("audio", "out2", buf, ini);
  //sprintf(buf, "%u", mState.mAudioInIsMono);
  //WritePrivateProfileString("audio", "monoinput", buf, ini);
 
  WDL_String str;
  str.SetFormatted(32, "%i", mState.mBufferSize);
  WritePrivateProfileString("audio", "buffer", str.Get(), ini);
 
  str.SetFormatted(32, "%i", mState.mAudioSR);
  WritePrivateProfileString("audio", "sr", str.Get(), ini);
 
  WritePrivateProfileString("midi", "indev", mState.mMidiInDev.Get(), ini);
  WritePrivateProfileString("midi", "outdev", mState.mMidiOutDev.Get(), ini);
 
  sprintf(buf, "%u", mState.mMidiInChan);
  WritePrivateProfileString("midi", "inchan", buf, ini);
  sprintf(buf, "%u", mState.mMidiOutChan);
  WritePrivateProfileString("midi", "outchan", buf, ini);
}
 
std::string IPlugAPPHost::GetAudioDeviceName(uint32_t deviceID) const
{
  auto str = mDAC->getDeviceInfo(deviceID).name;
  std::size_t pos = str.find(':');
 
  if (pos != std::string::npos)
  {
    std::string subStr = str.substr(pos + 1);
    return subStr;
  }
  else
  {
    return str;
  }
}
 
std::optional<uint32_t> IPlugAPPHost::GetAudioDeviceID(const char* deviceNameToTest) const
{
  auto deviceIDs = mDAC->getDeviceIds();
 
  for (auto deviceID : deviceIDs)
  {
    auto name = GetAudioDeviceName(deviceID);
 
    if (std::string_view(deviceNameToTest) == name)
    {
      return deviceID;
    }
  }
  
  return std::nullopt;
}
 
int IPlugAPPHost::GetMIDIPortNumber(ERoute direction, const char* nameToTest) const
{
  int start = 1;
  
  auto nameStrView = std::string_view(nameToTest);
  
  if (direction == ERoute::kInput)
  {
    if (nameStrView == OFF_TEXT) return 0;
    
  #ifdef OS_MAC
    start = 2;
    if (nameStrView == "virtual input") return 1;
  #endif
    
    for (int i = 0; i < mMidiIn->getPortCount(); i++)
    {
      if (nameStrView == mMidiIn->getPortName(i).c_str())
        return (i + start);
    }
  }
  else
  {
    if (nameStrView == OFF_TEXT) return 0;
  
  #ifdef OS_MAC
    start = 2;
    if (nameStrView == "virtual output") return 1;
  #endif
  
    for (int i = 0; i < mMidiOut->getPortCount(); i++)
    {
      if (nameStrView == mMidiOut->getPortName(i).c_str())
        return (i + start);
    }
  }
  
  return -1;
}
 
void IPlugAPPHost::ProbeAudioIO()
{
  DBGMSG("\nRtAudio Version %s", RtAudio::getVersion().c_str());
 
  RtAudio::DeviceInfo info;
 
  mAudioInputDevIDs.clear();
  mAudioOutputDevIDs.clear();
 
  auto deviceIDs = mDAC->getDeviceIds();
 
  for (auto deviceID : deviceIDs)
  {
    info = mDAC->getDeviceInfo(deviceID);
 
    if (info.inputChannels > 0)
    {
      mAudioInputDevIDs.push_back(deviceID);
    }
    
    if (info.outputChannels > 0)
    {
      mAudioOutputDevIDs.push_back(deviceID);
    }
    
    if (info.isDefaultInput)
    {
      mDefaultInputDev = deviceID;
    }
    
    if (info.isDefaultOutput)
    {
      mDefaultOutputDev = deviceID;
    }
  }
}
 
void IPlugAPPHost::ProbeMidiIO()
{
  if (!mMidiIn || !mMidiOut)
    return;
  else
  {
    int nInputPorts = mMidiIn->getPortCount();
 
    mMidiInputDevNames.push_back(OFF_TEXT);
 
#ifdef OS_MAC
    mMidiInputDevNames.push_back("virtual input");
#endif
 
    for (int i=0; i<nInputPorts; i++)
    {
      mMidiInputDevNames.push_back(mMidiIn->getPortName(i));
    }
 
    int nOutputPorts = mMidiOut->getPortCount();
 
    mMidiOutputDevNames.push_back(OFF_TEXT);
 
#ifdef OS_MAC
    mMidiOutputDevNames.push_back("virtual output");
#endif
 
    for (int i=0; i<nOutputPorts; i++)
    {
      mMidiOutputDevNames.push_back(mMidiOut->getPortName(i));
      //This means the virtual output port wont be added as an input
    }
  }
}
 
bool IPlugAPPHost::AudioSettingsInStateAreEqual(AppState& os, AppState& ns)
{
  if (os.mAudioDriverType != ns.mAudioDriverType) return false;
  if (std::string_view(os.mAudioInDev.Get()) != ns.mAudioInDev.Get()) return false;
  if (std::string_view(os.mAudioOutDev.Get()) != ns.mAudioOutDev.Get()) return false;
  if (os.mAudioSR != ns.mAudioSR) return false;
  if (os.mBufferSize != ns.mBufferSize) return false;
  if (os.mAudioInChanL != ns.mAudioInChanL) return false;
  if (os.mAudioInChanR != ns.mAudioInChanR) return false;
  if (os.mAudioOutChanL != ns.mAudioOutChanL) return false;
  if (os.mAudioOutChanR != ns.mAudioOutChanR) return false;
//  if (os.mAudioInIsMono != ns.mAudioInIsMono) return false;
 
  return true;
}
 
bool IPlugAPPHost::MIDISettingsInStateAreEqual(AppState& os, AppState& ns)
{
  if (std::string_view(os.mMidiInDev.Get()) != ns.mMidiInDev.Get()) return false;
  if (std::string_view(os.mMidiOutDev.Get()) != ns.mMidiOutDev.Get()) return false;
  if (os.mMidiInChan != ns.mMidiInChan) return false;
  if (os.mMidiOutChan != ns.mMidiOutChan) return false;
 
  return true;
}
 
bool IPlugAPPHost::TryToChangeAudioDriverType()
{
  CloseAudio();
  
  if (mDAC)
  {
    mDAC = nullptr;
  }
 
#if defined OS_WIN
  if (mState.mAudioDriverType == kDeviceASIO)
    mDAC = std::make_unique<RtAudio>(RtAudio::WINDOWS_ASIO);
  else if (mState.mAudioDriverType == kDeviceDS)
    mDAC = std::make_unique<RtAudio>(RtAudio::WINDOWS_DS);
#elif defined OS_MAC
  if (mState.mAudioDriverType == kDeviceCoreAudio)
    mDAC = std::make_unique<RtAudio>(RtAudio::MACOSX_CORE);
  //else
  //mDAC = std::make_unique<RtAudio>(RtAudio::UNIX_JACK);
#else
  #error NOT IMPLEMENTED
#endif
 
  if (mDAC)
  {
    mDAC->setErrorCallback(ErrorCallback);
    return true;
  }
 
  return false;
}
 
bool IPlugAPPHost::TryToChangeAudio()
{
#if defined OS_WIN
  // ASIO has one device, use the output for the input ID
  auto inputID = GetAudioDeviceID(mState.mAudioDriverType == kDeviceASIO ? mState.mAudioOutDev.Get() : mState.mAudioInDev.Get());
#elif defined OS_MAC
  auto inputID = GetAudioDeviceID(mState.mAudioInDev.Get());
#else
  #error NOT IMPLEMENTED
#endif
  auto outputID = GetAudioDeviceID(mState.mAudioOutDev.Get());
 
  bool failedToFindDevice = false;
  bool resetToDefault = false;
 
  if (!inputID)
  {
    if (mDefaultInputDev)
    {
      resetToDefault = true;
      inputID = mDefaultInputDev;
 
      if (mAudioInputDevIDs.size())
        mState.mAudioInDev.Set(GetAudioDeviceName(inputID.value()).c_str());
    }
    else
      failedToFindDevice = true;
  }
 
  if (!outputID)
  {
    if (mDefaultOutputDev)
    {
      resetToDefault = true;
      outputID = mDefaultOutputDev;
 
      if (mAudioOutputDevIDs.size())
        mState.mAudioOutDev.Set(GetAudioDeviceName(outputID.value()).c_str());
    }
    else
      failedToFindDevice = true;
  }
 
  if (resetToDefault)
  {
    DBGMSG("Couldn't find previous audio device, reseting to default\n");
    UpdateINI();
  }
 
  if (failedToFindDevice)
    MessageBox(gHWND, "Please check the audio settings", "Error", MB_OK);
 
  if (inputID && outputID)
  {
    return InitAudio(inputID.value(), outputID.value(), mState.mAudioSR, mState.mBufferSize);
  }
 
  return false;
}
 
bool IPlugAPPHost::SelectMIDIDevice(ERoute direction, const char* pPortName)
{
  int port = GetMIDIPortNumber(direction, pPortName);
 
  if (direction == ERoute::kInput)
  {
    if (port == -1)
    {
      mState.mMidiInDev.Set(OFF_TEXT);
      UpdateINI();
      port = 0;
    }
 
    //TODO: send all notes off?
    if (mMidiIn)
    {
      mMidiIn->closePort();
 
      if (port == 0)
      {
        return true;
      }
  #if defined OS_WIN
      else
      {
        mMidiIn->openPort(port-1);
        return true;
      }
  #elif defined OS_MAC
      else if (port == 1)
      {
        std::string virtualMidiInputName = "To ";
        virtualMidiInputName += BUNDLE_NAME;
        mMidiIn->openVirtualPort(virtualMidiInputName);
        return true;
      }
      else
      {
        mMidiIn->openPort(port-2);
        return true;
      }
  #else
   #error NOT IMPLEMENTED
  #endif
    }
  }
  else
  {
    if (port == -1)
    {
      mState.mMidiOutDev.Set(OFF_TEXT);
      UpdateINI();
      port = 0;
    }
    
    if (mMidiOut)
    {
      //TODO: send all notes off?
      mMidiOut->closePort();
      
      if (port == 0)
        return true;
#if defined OS_WIN
      else
      {
        mMidiOut->openPort(port-1);
        return true;
      }
#elif defined OS_MAC
      else if (port == 1)
      {
        std::string virtualMidiOutputName = "From ";
        virtualMidiOutputName += BUNDLE_NAME;
        mMidiOut->openVirtualPort(virtualMidiOutputName);
        return true;
      }
      else
      {
        mMidiOut->openPort(port-2);
        return true;
      }
#else
  #error NOT IMPLEMENTED
#endif
    }
  }
  
  return false;
}
 
void IPlugAPPHost::CloseAudio()
{
  if (mDAC && mDAC->isStreamOpen())
  {
    if (mDAC->isStreamRunning())
    {
      mAudioEnding = true;
    
      while (!mAudioDone)
        Sleep(10);
      
      mDAC->abortStream();
    }
    
    mDAC->closeStream();
  }
}
 
bool IPlugAPPHost::InitAudio(uint32_t inID, uint32_t outID, uint32_t sr, uint32_t iovs)
{
  CloseAudio();
 
  RtAudio::StreamParameters iParams, oParams;
  iParams.deviceId = inID;
  iParams.nChannels = GetPlug()->MaxNChannels(ERoute::kInput); // TODO: flexible channel count
  iParams.firstChannel = 0; // TODO: flexible channel count
 
  oParams.deviceId = outID;
  oParams.nChannels = GetPlug()->MaxNChannels(ERoute::kOutput); // TODO: flexible channel count
  oParams.firstChannel = 0; // TODO: flexible channel count
 
  mBufferSize = iovs; // mBufferSize may get changed by stream
 
  DBGMSG("trying to start audio stream @ %i sr, buffer size %i\nindev = %s\noutdev = %s\ninputs = %i\noutputs = %i\n",
    sr, mBufferSize, GetAudioDeviceName(inID).c_str(), GetAudioDeviceName(outID).c_str(), iParams.nChannels, oParams.nChannels);
 
  RtAudio::StreamOptions options;
  options.flags = RTAUDIO_NONINTERLEAVED;
  // options.streamName = BUNDLE_NAME; // JACK stream name, not used on other streams
 
  mBufIndex = 0;
  mSamplesElapsed = 0;
  mSampleRate = static_cast<double>(sr);
  mVecWait = 0;
  mAudioEnding = false;
  mAudioDone = false;
  
  mIPlug->SetBlockSize(APP_SIGNAL_VECTOR_SIZE);
  mIPlug->SetSampleRate(mSampleRate);
  mIPlug->OnReset();
 
  auto status = mDAC->openStream(&oParams, iParams.nChannels > 0 ? &iParams : nullptr, RTAUDIO_FLOAT64, sr, &mBufferSize, &AudioCallback, this, &options);
 
  if (status != RtAudioErrorType::RTAUDIO_NO_ERROR)
  {
    DBGMSG("%s", mDAC->getErrorText().c_str());
    return false;
  }
 
  for (int i = 0; i < iParams.nChannels; i++)
  {
    mInputBufPtrs.Add(nullptr); //will be set in callback
  }
    
  for (int i = 0; i < oParams.nChannels; i++)
  {
    mOutputBufPtrs.Add(nullptr); //will be set in callback
  }
    
  if (mDAC->startStream() != RTAUDIO_NO_ERROR)
  {
    DBGMSG("Error starting stream: %s\n", mDAC->getErrorText().c_str());
    return false;
  }
 
  mActiveState = mState;
 
  return true;
}
 
bool IPlugAPPHost::InitMidi()
{
  try
  {
    mMidiIn = std::make_unique<RtMidiIn>();
  }
  catch (RtMidiError &error)
  {
    mMidiIn = nullptr;
    error.printMessage();
    return false;
  }
 
  try
  {
    mMidiOut = std::make_unique<RtMidiOut>();
  }
  catch (RtMidiError &error)
  {
    mMidiOut = nullptr;
    error.printMessage();
    return false;
  }
 
  mMidiIn->setCallback(&MIDICallback, this);
  mMidiIn->ignoreTypes(false, true, false );
 
  return true;
}
 
void ApplyFades(double *pBuffer, int nChans, int nFrames, bool down)
{
  for (int i = 0; i < nChans; i++)
  {
    double *pIO = pBuffer + (i * nFrames);
    
    if (down)
    {
      for (int j = 0; j < nFrames; j++)
        pIO[j] *= ((double) (nFrames - (j + 1)) / (double) nFrames);
    }
    else
    {
      for (int j = 0; j < nFrames; j++)
        pIO[j] *= ((double) j / (double) nFrames);
    }
  }
}
 
// static
int IPlugAPPHost::AudioCallback(void* pOutputBuffer, void* pInputBuffer, uint32_t nFrames, double streamTime, RtAudioStreamStatus status, void* pUserData)
{
  IPlugAPPHost* _this = (IPlugAPPHost*) pUserData;
 
  int nins = _this->GetPlug()->MaxNChannels(ERoute::kInput);
  int nouts = _this->GetPlug()->MaxNChannels(ERoute::kOutput);
  
  double* pInputBufferD = static_cast<double*>(pInputBuffer);
  double* pOutputBufferD = static_cast<double*>(pOutputBuffer);
 
  bool startWait = _this->mVecWait >= APP_N_VECTOR_WAIT; // wait APP_N_VECTOR_WAIT * iovs before processing audio, to avoid clicks
  bool doFade = _this->mVecWait == APP_N_VECTOR_WAIT || _this->mAudioEnding;
  
  if (startWait && !_this->mAudioDone)
  {
    if (doFade)
      ApplyFades(pInputBufferD, nins, nFrames, _this->mAudioEnding);
    
    for (int i = 0; i < nFrames; i++)
    {
      _this->mBufIndex %= APP_SIGNAL_VECTOR_SIZE;
 
      if (_this->mBufIndex == 0)
      {
        for (int c = 0; c < nins; c++)
        {
          _this->mInputBufPtrs.Set(c, (pInputBufferD + (c * nFrames)) + i);
        }
        
        for (int c = 0; c < nouts; c++)
        {
          _this->mOutputBufPtrs.Set(c, (pOutputBufferD + (c * nFrames)) + i);
        }
        
        _this->mIPlug->AppProcess(_this->mInputBufPtrs.GetList(), _this->mOutputBufPtrs.GetList(), APP_SIGNAL_VECTOR_SIZE);
 
        _this->mSamplesElapsed += APP_SIGNAL_VECTOR_SIZE;
      }
      
      for (int c = 0; c < nouts; c++)
      {
        pOutputBufferD[c * nFrames + i] *= APP_MULT;
      }
 
      _this->mBufIndex++;
    }
    
    if (doFade)
      ApplyFades(pOutputBufferD, nouts, nFrames, _this->mAudioEnding);
    
    if (_this->mAudioEnding)
      _this->mAudioDone = true;
  }
  else
  {
    memset(pOutputBufferD, 0, nFrames * nouts * sizeof(double));
  }
  
  _this->mVecWait = std::min(_this->mVecWait + 1, uint32_t(APP_N_VECTOR_WAIT + 1));
 
  return 0;
}
 
// static
void IPlugAPPHost::MIDICallback(double deltatime, std::vector<uint8_t>* pMsg, void* pUserData)
{
  IPlugAPPHost* _this = (IPlugAPPHost*) pUserData;
  
  if (pMsg->size() == 0 || _this->mExiting)
    return;
  
  if (pMsg->size() > 3)
  {
    if (pMsg->size() > MAX_SYSEX_SIZE)
    {
      DBGMSG("SysEx message exceeds MAX_SYSEX_SIZE\n");
      return;
    }
    
    SysExData data { 0, static_cast<int>(pMsg->size()), pMsg->data() };
    
    _this->mIPlug->mSysExMsgsFromCallback.Push(data);
    return;
  }
  else if (pMsg->size())
  {
    IMidiMsg msg;
    msg.mStatus = pMsg->at(0);
    pMsg->size() > 1 ? msg.mData1 = pMsg->at(1) : msg.mData1 = 0;
    pMsg->size() > 2 ? msg.mData2 = pMsg->at(2) : msg.mData2 = 0;
 
    _this->mIPlug->mMidiMsgsFromCallback.Push(msg);
  }
}
 
// static
void IPlugAPPHost::ErrorCallback(RtAudioErrorType type, const std::string &errorText)
{
  std::cerr << "\nerrorCallback: " << errorText << "\n\n";
}