very, very simple WP with midi CC out
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Sebastian
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#pragma once
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#include <libremidi/backends/alsa_raw/config.hpp>
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#include <libremidi/backends/alsa_raw/helpers.hpp>
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#include <libremidi/backends/dummy.hpp>
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#if LIBREMIDI_HAS_UDEV
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#include <libremidi/backends/linux/helpers.hpp>
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#include <libremidi/backends/linux/udev.hpp>
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#include <libremidi/detail/observer.hpp>
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#include <stdexcept>
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namespace libremidi::alsa_raw
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{
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template <typename Enumerator>
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class observer_impl_base : public observer_api
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{
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public:
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struct
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: observer_configuration
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, alsa_raw_observer_configuration
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{
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} configuration;
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const libasound& snd = libasound::instance();
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explicit observer_impl_base(
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observer_configuration&& conf, alsa_raw_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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fds[0] = this->udev;
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fds[1] = termination_event;
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fds[2] = timer_fd;
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// Set-up initial state
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if (configuration.notify_in_constructor)
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this->check_devices();
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// Start thread
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thread = std::thread{[this] { this->run(); }};
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}
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~observer_impl_base()
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{
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termination_event.notify();
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if (thread.joinable())
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thread.join();
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}
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std::vector<libremidi::input_port> get_input_ports() const noexcept override
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{
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std::vector<libremidi::input_port> ret;
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Enumerator new_devs;
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new_devs.enumerate_cards();
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for (auto& d : new_devs.inputs)
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{
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ret.push_back(to_port_info<true>(d));
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}
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return ret;
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}
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std::vector<libremidi::output_port> get_output_ports() const noexcept override
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{
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std::vector<libremidi::output_port> ret;
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Enumerator new_devs;
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new_devs.enumerate_cards();
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for (auto& d : new_devs.outputs)
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{
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ret.push_back(to_port_info<false>(d));
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}
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return ret;
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}
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private:
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void run()
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{
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for (;;)
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{
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if (int err = poll(fds, 3, -1); err < 0)
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{
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if (err == -EAGAIN)
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continue;
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else
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return;
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}
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// Check udev
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if (fds[0].revents & POLLIN)
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{
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udev_device* dev = udev.udev.monitor_receive_device(udev.monitor);
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if (!dev)
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continue;
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std::string_view act = udev.udev.device_get_action(dev);
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std::string_view ss = udev.udev.device_get_subsystem(dev);
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if (!act.empty() && ss == "snd_seq")
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{
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if (act == "add" || act == "remove")
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{
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// Check every 100 milliseconds for ten seconds
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this->timer_fd.restart(configuration.poll_period.count());
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timer_check_counts = 100;
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}
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}
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udev.udev.device_unref(dev);
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fds[0].revents = 0;
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}
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// Check eventfd
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if (fds[1].revents & POLLIN)
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{
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break;
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}
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// Check timer
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if (fds[2].revents & POLLIN)
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{
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if (this->timer_check_counts-- <= 0)
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this->timer_fd.cancel();
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fds[2].revents = 0;
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check_devices();
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}
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}
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}
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template <bool Input>
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auto to_port_info(alsa_raw::alsa_raw_port_info p) const noexcept
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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 = raw_to_port_handle({p.card, p.dev, p.sub}),
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.manufacturer = p.card_name,
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.device_name = p.device_name,
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.port_name = p.subdevice_name,
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.display_name = p.subdevice_name}};
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}
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void check_devices()
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{
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Enumerator new_devs;
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new_devs.enumerate_cards();
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for (auto& in_prev : current_inputs)
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{
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if (auto it = std::find(new_devs.inputs.begin(), new_devs.inputs.end(), in_prev);
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it == new_devs.inputs.end())
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{
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if (auto& cb = this->configuration.input_removed)
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{
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cb(to_port_info<true>(in_prev));
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}
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}
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}
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for (auto& in_next : new_devs.inputs)
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{
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if (auto it = std::find(current_inputs.begin(), current_inputs.end(), in_next);
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it == current_inputs.end())
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{
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if (auto& cb = this->configuration.input_added)
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{
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cb(to_port_info<true>(in_next));
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}
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}
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}
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for (auto& out_prev : current_outputs)
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{
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if (auto it = std::find(new_devs.outputs.begin(), new_devs.outputs.end(), out_prev);
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it == new_devs.outputs.end())
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{
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if (auto& cb = this->configuration.output_removed)
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{
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cb(to_port_info<false>(out_prev));
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}
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}
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}
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for (auto& out_next : new_devs.outputs)
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{
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if (auto it = std::find(current_outputs.begin(), current_outputs.end(), out_next);
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it == current_outputs.end())
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{
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if (auto& cb = this->configuration.output_added)
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{
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cb(to_port_info<false>(out_next));
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}
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}
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}
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current_inputs = std::move(new_devs.inputs);
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current_outputs = std::move(new_devs.outputs);
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}
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udev_helper udev{};
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eventfd_notifier termination_event{};
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timerfd_timer timer_fd{};
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int timer_check_counts = 0;
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std::thread thread;
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std::vector<alsa_raw_port_info> current_inputs;
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std::vector<alsa_raw_port_info> current_outputs;
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pollfd fds[3]{};
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};
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}
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#else
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#include <libremidi/backends/dummy.hpp>
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namespace libremidi::alsa_raw
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{
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template <typename Enumerator>
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struct observer_impl_base : observer_dummy
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{
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explicit observer_impl_base(
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[[maybe_unused]] observer_configuration&& conf,
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[[maybe_unused]] alsa_raw_observer_configuration&& apiconf)
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: observer_dummy{dummy_configuration{}, dummy_configuration{}}
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{
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}
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};
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}
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#endif
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namespace libremidi::alsa_raw
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{
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struct observer_impl : observer_impl_base<alsa_raw::midi1_enumerator>
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{
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using alsa_raw::observer_impl_base<midi1_enumerator>::observer_impl_base;
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libremidi::API get_current_api() const noexcept override { return libremidi::API::ALSA_RAW; }
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};
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}
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