#include <objbase.h>
#include <mmdeviceapi.h>
#include <audiopolicy.h>

IAudioSessionManager2 *GetSessionManager()
{
    IAudioSessionManager2* manager = NULL;
    IMMDeviceEnumerator* devenum = NULL;
    if (CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_ALL,
        __uuidof(IMMDeviceEnumerator), (void**)&devenum) == S_OK) {
        IMMDevice* device = NULL;
        if (devenum->GetDefaultAudioEndpoint(eRender, eConsole, &device) == S_OK) {
            device->Activate(__uuidof(IAudioSessionManager2), CLSCTX_ALL, NULL, (void**)&manager);
            device->Release();
        }
        devenum->Release();
    }
    return manager;
}


int _tmain(int argc, _TCHAR* argv[])
{
    CoInitializeEx(NULL, COINIT_MULTITHREADED);

    IAudioSessionManager2* manager = GetSessionManager();
    if (manager != NULL) {
        IAudioSessionEnumerator *sessions;
        if (manager->GetSessionEnumerator(&sessions) == S_OK) {
            int s_count;
            sessions->GetCount(&s_count);
            for (int i = 0; i < s_count; i++) {
                IAudioSessionControl *current;
                if (sessions->GetSession(i, &current) == S_OK) {
                    ISimpleAudioVolume *vol = NULL;
                    current->QueryInterface(__uuidof(ISimpleAudioVolume), (void**)&vol);
                    if (vol != NULL) {
                        vol->SetMasterVolume(0.0f, NULL);
                        vol->Release();
                    }
                    current->Release();
                }
            }
            sessions->Release();
        }
        manager->Release();
    }

    CoUninitialize();
    return 0;
}