main.cpp

// command : em++ --bind main.cpp -o test.html -g
#include <emscripten.h>
#include <emscripten/emscripten.h>
#include <emscripten/val.h>
#include <emscripten/bind.h>
#include <strings.h>

using namespace emscripten;

void awn_cb (int channels) {
  val console = val::global("console");
  console.call<void>("log", channels);
}

class AudioWorkletWrapper {
public:
  AudioWorkletWrapper(int sample_rate, int channels, val sab_view) {
    _channels = channels;
    _sample_rate = sample_rate;
    _sab_view = sab_view;

    val audio_ctx_options = val::object();
    audio_ctx_options.set("sampleRate", _sample_rate);

    _context = val::global("AudioContext").new_(audio_ctx_options);
    _context.call<void>("suspend");
  };

  void init_worklet_node() {
    val aw = _context["audioWorklet"];

    // bind awn_cb                                                                                                     
    val awn_cb_args = val::module_property("awn_cb").call<val>("bind", val::null(), 42);

    // val console = val::global("console");                                                                           
    // console.call<void>("log", awn_cb_args);                                                                         
    // awn_cb_args();                                                                                                  
    aw.call<val>("addModule", std::string("worklet-processor.js")).call<val>("then", awn_cb_args);
  }
  val getContext() const { return _context; }
  void setContext(val _) { _context = _; }

private:
  val _context = val::undefined();
  int _channels = 0;
  int _sample_rate = 0;
  val _sab_view = val::null();
};

EMSCRIPTEN_BINDINGS(AWWSCOPE) {
  function("awn_cb", &awn_cb);
  class_<AudioWorkletWrapper>("AudioWorkletWrapper")
    .constructor<int, int, val>()
    .function("initWorkletNode", &AudioWorkletWrapper::init_worklet_node)
    .property("context", &AudioWorkletWrapper::getContext, &AudioWorkletWrapper::setContext);
};

int main()
{
  val awInst = val::module_property("AudioWorkletWrapper").new_(44100, 2, val::array());
  awInst.call<val>("initWorkletNode");
}