very, very simple WP with midi CC out

2024-10-09 02:01:23 +02:00
commit 3d6fc151f1
126 changed files with 19539 additions and 0 deletions
@@ -0,0 +1,105 @@
+#if defined(__EMSCRIPTEN__)
+  #include <libremidi/backends/emscripten/midi_access.hpp>
+  #include <libremidi/backends/emscripten/observer.hpp>
+
+  #include <cassert>
+
+namespace libremidi
+{
+LIBREMIDI_INLINE observer_emscripten::observer_emscripten(
+    observer_configuration&& conf, emscripten_observer_configuration&& apiconf)
+    : configuration{std::move(conf), std::move(apiconf)}
+{
+  if (!configuration.has_callbacks())
+    return;
+
+  auto& webmidi = webmidi_helpers::midi_access_emscripten::instance();
+  webmidi.register_observer(*this);
+
+  // Trigger an initial notification
+  webmidi.load_current_infos();
+
+  if (configuration.notify_in_constructor)
+    update(webmidi.inputs(), webmidi.outputs());
+}
+
+LIBREMIDI_INLINE observer_emscripten::~observer_emscripten()
+{
+  if (!configuration.has_callbacks())
+    return;
+
+  webmidi_helpers::midi_access_emscripten::instance().unregister_observer(*this);
+}
+
+LIBREMIDI_INLINE
+libremidi::API observer_emscripten::get_current_api() const noexcept
+{
+  return libremidi::API::WEBMIDI;
+}
+
+template <bool Input>
+static auto to_port_info(int index, const webmidi_helpers::device_information& dev)
+    -> std::conditional_t<Input, input_port, output_port>
+{
+  return {
+      {.client = 0,
+       .port = (uint64_t)index,
+       .manufacturer = "",
+       .device_name = "",
+       .port_name = dev.name,
+       .display_name = dev.name}};
+}
+
+LIBREMIDI_INLINE
+std::vector<libremidi::input_port> observer_emscripten::get_input_ports() const noexcept
+{
+  std::vector<libremidi::input_port> ret;
+  auto& webmidi = webmidi_helpers::midi_access_emscripten::instance();
+  webmidi.load_current_infos();
+
+  for (std::size_t i = 0, n = webmidi.input_count(); i < n; i++)
+  {
+    ret.push_back(to_port_info<true>(i, webmidi.inputs()[i]));
+  }
+
+  return ret;
+}
+
+LIBREMIDI_INLINE
+std::vector<libremidi::output_port> observer_emscripten::get_output_ports() const noexcept
+{
+  std::vector<libremidi::output_port> ret;
+  auto& webmidi = webmidi_helpers::midi_access_emscripten::instance();
+  webmidi.load_current_infos();
+
+  for (std::size_t i = 0, n = webmidi.output_count(); i < n; i++)
+  {
+    ret.push_back(to_port_info<false>(i, webmidi.outputs()[i]));
+  }
+
+  return ret;
+}
+
+LIBREMIDI_INLINE void observer_emscripten::update(
+    const std::vector<observer_emscripten::device>& current_inputs,
+    const std::vector<observer_emscripten::device>& current_outputs)
+{
+  // WebMIDI never remove inputs, it just marks them as disconnected.
+  // At least in known browsers...
+  assert(current_inputs.size() >= m_known_inputs.size());
+  assert(current_outputs.size() >= m_known_outputs.size());
+
+  for (std::size_t i = m_known_inputs.size(); i < current_inputs.size(); i++)
+  {
+    m_known_inputs.push_back(current_inputs[i]);
+    configuration.input_added(to_port_info<true>(i, m_known_inputs[i]));
+  }
+
+  for (std::size_t i = m_known_outputs.size(); i < current_outputs.size(); i++)
+  {
+    m_known_outputs.push_back(current_outputs[i]);
+    configuration.output_added(to_port_info<false>(i, m_known_outputs[i]));
+  }
+}
+}
+#endif