ref: 9aa38e0a65d48bd8265e497a18b971f3047f0e2b
dir: /platform/win32/volume_control.c/
#include "volume_control.h" #define COBJMACROS #define CINTERFACE #define MICROSOFT_WINDOWS_WINBASE_H_DEFINE_INTERLOCKED_CPLUSPLUS_OVERLOADS 0 #include <initguid.h> #include <audioclient.h> #include <audiopolicy.h> #include <mmdeviceapi.h> static ISimpleAudioVolume *GetSimpleAudioVolume(); DEFINE_GUID(IID_IMMDeviceEnumerator, 0XA95664D2, 0X9614, 0X4F35, 0XA7, 0X46, 0XDE, 0X8D, 0XB6, 0X36, 0X17, 0XE6); DEFINE_GUID(CLSID_MMDeviceEnumerator, 0XBCDE0395, 0XE52F, 0X467C, 0X8E, 0X3D, 0XC4, 0X57, 0X92, 0X91, 0X69, 0X2E); DEFINE_GUID(IID_IAudioSessionManager, 0X77AA99A0, 0X1BD6, 0X484F, 0X8B, 0XC7, 0X2C, 0X65, 0X4C, 0X9A, 0X9B, 0X6F); static void InitializeCom() { static bool com_initialized; if (!com_initialized) com_initialized = SUCCEEDED(CoInitialize(NULL)); } int GetApplicationVolume() { ISimpleAudioVolume *simple_audio_volume = GetSimpleAudioVolume(); if (!simple_audio_volume) return false; float volume_level = -1; HRESULT result = ISimpleAudioVolume_GetMasterVolume(simple_audio_volume, &volume_level); ISimpleAudioVolume_Release(simple_audio_volume); return (int)(volume_level * 100); } bool SetApplicationVolume(int volume_level) { ISimpleAudioVolume *simple_audio_volume = GetSimpleAudioVolume(); if (!simple_audio_volume) return false; HRESULT result = ISimpleAudioVolume_SetMasterVolume(simple_audio_volume, (float)(volume_level / 100.0), NULL); ISimpleAudioVolume_Release(simple_audio_volume); return SUCCEEDED(result); } bool SetApplicationMuted(bool muted) { ISimpleAudioVolume *simple_audio_volume = GetSimpleAudioVolume(); if (!simple_audio_volume) return false; HRESULT result = ISimpleAudioVolume_SetMute(simple_audio_volume, muted, NULL); ISimpleAudioVolume_Release(simple_audio_volume); return SUCCEEDED(result); } static ISimpleAudioVolume *GetSimpleAudioVolume() { HRESULT result; IMMDeviceEnumerator *device_enumerator = NULL; IMMDevice *device = NULL; IAudioSessionManager *audio_session_manager = NULL; ISimpleAudioVolume *simple_audio_volume = NULL; InitializeCom(); result = CoCreateInstance(&CLSID_MMDeviceEnumerator, NULL, CLSCTX_INPROC_SERVER, &IID_IMMDeviceEnumerator, &device_enumerator); if (FAILED(result) || device_enumerator == NULL) goto done; result = IMMDeviceEnumerator_GetDefaultAudioEndpoint(device_enumerator, eRender, eConsole, &device); if (FAILED(result) || device == NULL) goto done; result = IMMDevice_Activate(device, &IID_IAudioSessionManager, CLSCTX_INPROC_SERVER, NULL, &audio_session_manager); if (FAILED(result) || audio_session_manager == NULL) goto done; result = IAudioSessionManager_GetSimpleAudioVolume(audio_session_manager, &GUID_NULL, 0, &simple_audio_volume); done: if (device_enumerator) IMMDeviceEnumerator_Release(device_enumerator); if (device) IMMDevice_Release(device); if (audio_session_manager) IAudioSessionManager_Release(audio_session_manager); return simple_audio_volume; }