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