text: /*************************************************************************/
  /*  audio_driver_wasapi.h                                                */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
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  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #pragma once
  
  #ifdef WASAPI_ENABLED
  
  #include "core/os/mutex.h"
  #include "core/os/thread.h"
  #include "servers/audio_server.h"
  
  #include <audioclient.h>
  #include <mmdeviceapi.h>
  #include <windows.h>
  
  class AudioDriverWASAPI : public AudioDriver {
  
      class AudioDeviceWASAPI {
      public:
          IAudioClient *audio_client = nullptr;
          IAudioRenderClient *render_client = nullptr;
          IAudioCaptureClient *capture_client = nullptr;
          bool active = false;
  
          WORD format_tag=0;
          WORD bits_per_sample=0;
          unsigned int channels=0;
          unsigned int frame_size=0;
  
          String device_name;
          String new_device;
  
          AudioDeviceWASAPI() :
                  device_name("Default"),
                  new_device("Default") {
          }
      };
  
      AudioDeviceWASAPI audio_input;
      AudioDeviceWASAPI audio_output;
  
      Mutex mutex;
      Thread thread;
  
      Vector<int32_t> samples_in;
  
      unsigned int channels;
      int mix_rate;
      int buffer_frames;
  
      bool thread_exited;
      mutable bool exit_thread;
  
      static _FORCE_INLINE_ void write_sample(WORD format_tag, int bits_per_sample, BYTE *buffer, int i, int32_t sample);
      static _FORCE_INLINE_ int32_t read_sample(WORD format_tag, int bits_per_sample, BYTE *buffer, int i);
      static void thread_func(void *p_udata);
  
      Error init_render_device(bool reinit = false);
      Error init_capture_device(bool reinit = false);
  
      Error finish_render_device();
      Error finish_capture_device();
  
      Error audio_device_init(AudioDeviceWASAPI *p_device, bool p_capture, bool reinit);
      Error audio_device_finish(AudioDeviceWASAPI *p_device);
      Array audio_device_get_list(bool p_capture);
  
  public:
      virtual const char *get_name() const {
          return "WASAPI";
      }
  
      Error init() override;
      void start() override;
      int get_mix_rate() const override;
      SpeakerMode get_speaker_mode() const override;
      Array get_device_list() override;
      StringView get_device() override;
      void set_device(StringView device) override;
      void lock() override;
      void unlock() override;
      void finish() override;
  
      Error capture_start() override;
      Error capture_stop() override;
      Array capture_get_device_list() override;
      void capture_set_device(StringView p_name) override;
      String capture_get_device() override;
  
      AudioDriverWASAPI();
  };
  
  #endif //WASAPI_ENABLED
  