Method openPort

TheForceEngine/TFE_Audio/RtMidi.cpp:3762–3781

}

void MidiInWeb::openPort( unsigned int portNumber, const std::string &portName )
{
  if( !checkWebMidiAvailability() )
    return;
  if (open_port_number >= 0)
    return;

  MAIN_THREAD_EM_ASM( {
    // In Web MIDI API world, there is no step to open a port, but we have to register the input callback instead.
    var input = window._rtmidi_internals_get_port_by_number($0, true);
    input.onmidimessage = function(e) {
      // In RtMidi world, timestamps are delta time from previous message, while in Web MIDI world
      // timestamps are relative to window creation time (i.e. kind of absolute time with window "epoch" time).
      var rtmidiTimestamp = window._rtmidi_internals_latest_message_timestamp == 0.0 ? 0.0 : e.timeStamp - window._rtmidi_internals_latest_message_timestamp;
      window._rtmidi_internals_latest_message_timestamp = e.timeStamp;
      Module.ccall( 'rtmidi_onMidiMessageProc', 'void', ['number', 'array', 'number', 'number'], [$1, e.data, e.data.length, rtmidiTimestamp] );
    };
  }, portNumber, &inputData_ );
  open_port_number = portNumber;
}

void MidiInWeb::openVirtualPort( const std::string &portName )
{