audio-router/index.js

A Node.js package for interacting with audio devices using C++ DLL

const path = require('path');
const koffi = require('koffi');

const dllPath = path.join(__dirname, 'AudioDLL.dll');
const audioLib = koffi.load(dllPath);


const C_AudioEndpointInfo = koffi.struct('C_AudioEndpointInfo', {
  id: koffi.pointer('char16_t'),
  friendlyName: koffi.pointer('char16_t'),
  description: koffi.pointer('char16_t'),
  dataFlow: 'int',
  role: 'int',
  state: 'uint32',
  isDefault: 'int'
});

const C_AudioSessionInfo = koffi.struct('C_AudioSessionInfo', {
  displayName: koffi.pointer('char16_t'),
  iconPath: koffi.pointer('char16_t'),
  processId: 'uint32',
  processName: koffi.pointer('char16_t'),
  volume: 'float',
  isMuted: 'int',
  sessionId: koffi.pointer('char16_t')
});
// 工具函数：JS 字符串转 wchar_t
function stringToWCharBuffer (str) {
  return Buffer.from(str + '\0', 'ucs2');
}
module.exports = {
  CreateAudioUtils: audioLib.func('int __stdcall CreateAudioUtils(void**)'),
  DestroyAudioUtils: audioLib.func('int __stdcall DestroyAudioUtils(void*)'),

  AudioUtils_Initialize: audioLib.func('int __stdcall AudioUtils_Initialize(void*)'),
  AudioUtils_Cleanup: audioLib.func('void __stdcall AudioUtils_Cleanup(void*)'),

  AudioUtils_GetAudioEndpoints: audioLib.func(
    'AudioUtils_GetAudioEndpoints',
    'int',
    [
      'void*',
      koffi.out(koffi.pointer(C_AudioEndpointInfo, 2)), // C_AudioEndpointInfo**
      koffi.out(koffi.pointer('int')) // int*
    ]
  ),

  AudioUtils_FreeAudioEndpoints: audioLib.func('void __stdcall AudioUtils_FreeAudioEndpoints(void*, int*)'),

  AudioUtils_GetAudioSessions: audioLib.func(
    'AudioUtils_GetAudioSessions',
    'int',
    [
      'void*',
      // koffi.pointer('char16_t'),
      koffi.pointer('char16_t'),
      koffi.out(koffi.pointer(C_AudioSessionInfo, 2)), // 二级指针
      koffi.out(koffi.pointer('int'))
    ]
  ),

  AudioUtils_GetAllAudioSessions: audioLib.func(
    'AudioUtils_GetAllAudioSessions',
    'int',
    [
      'void*',
      koffi.out(koffi.pointer(C_AudioSessionInfo, 2)),
      koffi.out(koffi.pointer('int'))
    ]
  ),

  AudioUtils_FreeAudioSessions: audioLib.func('void __stdcall AudioUtils_FreeAudioSessions(void* sessions, int count)'),

  AudioUtils_SetDefaultEndpoint: audioLib.func('int __stdcall AudioUtils_SetDefaultEndpoint(void*, wchar_t*, int)'),
  AudioUtils_SetEndpointName: audioLib.func('int __stdcall AudioUtils_SetEndpointName(void*, wchar_t*, wchar_t*)'),

  AudioUtils_SetPersistedDefaultAudioEndpoint: audioLib.func('int __stdcall AudioUtils_SetPersistedDefaultAudioEndpoint(void*, int, int, wchar_t)'),
  AudioUtils_GetPersistedDefaultAudioEndpoint: audioLib.func(
    'AudioUtils_GetPersistedDefaultAudioEndpoint',
    'int',
    [
      'void*',
      'int',
      'int',
      koffi.out(koffi.pointer(koffi.pointer('char16_t'))) // wchar_t* 也是二级指针
    ]
  ),

  AudioUtils_FreeString: audioLib.func('void __stdcall AudioUtils_FreeString(wchar_t*)'),

  AudioUtils_StartMultiCapture: audioLib.func('int __stdcall AudioUtils_StartMultiCapture(void*, wchar_t*, int, wchar_t*)'),
  AudioUtils_StopMultiCapture: audioLib.func('int __stdcall AudioUtils_StopMultiCapture(void*)'),

  AudioUtils_AddCaptureEndpoint: audioLib.func('int __stdcall AudioUtils_AddCaptureEndpoint(void*, wchar_t*, float)'),
  AudioUtils_RemoveCaptureEndpoint: audioLib.func('int __stdcall AudioUtils_RemoveCaptureEndpoint(void*, wchar_t*)'),
  AudioUtils_SetCaptureEndpointVolume: audioLib.func('int __stdcall AudioUtils_SetCaptureEndpointVolume(void*, wchar_t*, float)'),

  AudioUtils_GetCaptureStatus: audioLib.func(
    'AudioUtils_GetCaptureStatus',
    'int',
    [
      'void*',
      koffi.out(koffi.pointer(koffi.pointer('char16_t'))), // wchar_t** → 三重指针
      koffi.out(koffi.pointer('int'))
    ]
  ),
  AudioUtils_FreeCaptureStatus: audioLib.func('void __stdcall AudioUtils_FreeCaptureStatus(wchar_t*, int*)'),

  AudioUtils_GetAudioActivity: audioLib.func('int __stdcall AudioUtils_GetAudioActivity(void*, float*, int*)'),
  AudioUtils_IsCapturing: audioLib.func('int __stdcall AudioUtils_IsCapturing(void*)'),

  stringToWCharBuffer,
  C_AudioEndpointInfo,
  C_AudioSessionInfo,
};