working on win32 uwp! and libremidi update

include/libremidi/detail/conversion.hpp

@@ -0,0 +1,59 @@
+#pragma once
+// clang-format off
+#include <libremidi/config.hpp>
+// clang-format on
+
+#include <libremidi/cmidi2.hpp>
+#include <libremidi/error.hpp>
+#include <libremidi/message.hpp>
+#include <libremidi/ump.hpp>
+namespace libremidi
+{
+struct midi1_to_midi2
+{
+  stdx::error
+  convert(const unsigned char* message, std::size_t size, int64_t timestamp, auto on_ump)
+  {
+    context.midi1 = const_cast<unsigned char*>(message);
+    context.midi1_num_bytes = size;
+    context.midi1_proceeded_bytes = 0;
+    context.ump = ump;
+    context.ump_num_bytes = sizeof(ump);
+    context.ump_proceeded_bytes = 0;
+
+    if (auto res = cmidi2_convert_midi1_to_ump(&context); res != CMIDI2_CONVERSION_RESULT_OK)
+      return std::errc::invalid_argument;
+
+    return on_ump(context.ump, context.ump_proceeded_bytes / 4, timestamp);
+  }
+
+  cmidi2_midi_conversion_context context = [] {
+    cmidi2_midi_conversion_context tmp;
+    cmidi2_midi_conversion_context_initialize(&tmp);
+    return tmp;
+  }();
+  uint32_t ump[65536 / 4];
+};
+
+struct midi2_to_midi1
+{
+  stdx::error
+  convert(const uint32_t* message, std::size_t /* size */, int64_t timestamp, auto on_midi)
+  {
+    auto n
+        = cmidi2_convert_single_ump_to_midi1(midi, sizeof(midi), const_cast<uint32_t*>(message));
+    if (n > 0)
+      return on_midi(midi, n, timestamp);
+    else
+      return std::errc::no_buffer_space;
+  }
+
+  cmidi2_midi_conversion_context context = [] {
+    cmidi2_midi_conversion_context tmp;
+    cmidi2_midi_conversion_context_initialize(&tmp);
+    return tmp;
+  }();
+  uint8_t midi[65536];
+};
+
+}