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 +1,92 @@
+#pragma once
+#include <libremidi/backends/linux/dylib_loader.hpp>
+#include <libremidi/backends/linux/helpers.hpp>
+
+#include <libudev.h>
+
+#include <cassert>
+
+namespace libremidi
+{
+
+struct libudev
+{
+  // Useful one-liner:
+  // nm -A * | grep ' udev_'  | grep -v '@' | cut -f 2 -d 'U' | sort | uniq   | sed 's/ udev_//'| awk ' { print "LIBREMIDI_SYMBOL_DEF(udev, "$1");" }'
+
+  explicit libudev()
+      : library{"libudev.so.1"}
+  {
+    if (!library)
+    {
+      available = false;
+      return;
+    }
+
+    LIBREMIDI_SYMBOL_INIT(udev, device_get_action);
+    LIBREMIDI_SYMBOL_INIT(udev, device_get_subsystem);
+    LIBREMIDI_SYMBOL_INIT(udev, device_unref);
+    LIBREMIDI_SYMBOL_INIT(udev, monitor_enable_receiving);
+    LIBREMIDI_SYMBOL_INIT(udev, monitor_get_fd);
+    LIBREMIDI_SYMBOL_INIT(udev, monitor_new_from_netlink);
+    LIBREMIDI_SYMBOL_INIT(udev, monitor_receive_device);
+    LIBREMIDI_SYMBOL_INIT(udev, monitor_unref);
+    LIBREMIDI_SYMBOL_INIT2(udev, new, create);
+    LIBREMIDI_SYMBOL_INIT(udev, unref);
+  }
+
+  static const libudev& instance()
+  {
+    static const libudev self;
+    return self;
+  }
+
+  dylib_loader library;
+  bool available{true};
+
+  LIBREMIDI_SYMBOL_DEF(udev, device_get_action);
+  LIBREMIDI_SYMBOL_DEF(udev, device_get_subsystem);
+  LIBREMIDI_SYMBOL_DEF(udev, device_unref);
+  LIBREMIDI_SYMBOL_DEF(udev, monitor_enable_receiving);
+  LIBREMIDI_SYMBOL_DEF(udev, monitor_get_fd);
+  LIBREMIDI_SYMBOL_DEF(udev, monitor_new_from_netlink);
+  LIBREMIDI_SYMBOL_DEF(udev, monitor_receive_device);
+  LIBREMIDI_SYMBOL_DEF(udev, monitor_unref);
+  LIBREMIDI_SYMBOL_DEF2(udev, new, create);
+  LIBREMIDI_SYMBOL_DEF(udev, unref);
+};
+
+struct udev_helper
+{
+  udev_helper()
+  {
+    instance = udev.create();
+    assert(instance);
+
+    monitor = udev.monitor_new_from_netlink(instance, "udev");
+    assert(monitor);
+    udev.monitor_enable_receiving(monitor);
+  }
+
+  ~udev_helper()
+  {
+    udev.monitor_unref(monitor);
+    udev.unref(instance);
+  }
+
+  udev_helper(const udev_helper&) = delete;
+  udev_helper(udev_helper&&) = delete;
+  udev_helper& operator=(const udev_helper&) = delete;
+  udev_helper& operator=(udev_helper&&) = delete;
+
+  operator pollfd() const noexcept
+  {
+    return {.fd = udev.monitor_get_fd(monitor), .events = POLLIN, .revents = 0};
+  }
+
+  const libudev& udev = libudev::instance();
+  struct udev* instance{};
+  udev_monitor* monitor{};
+};
+
+}