ebiten/exp/audio/internal/driver/driver_windows.c

// Copyright 2015 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <windows.h>
#include <mmsystem.h>

void releaseSemaphore(void);

static void CALLBACK soundFilled(HWAVEOUT waveOut, UINT msg, DWORD_PTR instance, DWORD_PTR param1, DWORD_PTR param2)
{
  if (msg != WOM_DONE) {
    return;
  }
  releaseSemaphore();
}

MMRESULT waveOutOpen2(HWAVEOUT* waveOut, WAVEFORMATEX* format)
{
  return waveOutOpen(waveOut, WAVE_MAPPER, format, (DWORD_PTR)soundFilled, 0, CALLBACK_FUNCTION);
}