我目前正在研究“音量混音器”来控制我电脑上每个程序的音量(

Windows 10).

如何将每个节目/音频会话的音量级别设置为0到100的标量？

如您所见,在下面的代码中,我找到了GetPeakValue函数,但它返回的值如0.0812654或0.021352.

我确信这些值是标量中从1.0到0.0的每个音频会话的音量.但我想要的是音量限制,你可以在Windows音频混音器中设置,例如,而不是当前级别.因此,如果我将程序音量设置为50％,我想要一个像0.5的值.

在第二个函数(getVolume)中,您将看到我已经在0-100标量中获得了主卷,但是端点设备已经具有标量级别的函数.所以我至少需要相同的函数或计算,以便为每个音频会话获得这样的标量.

void getSessions() {

CoInitialize(NULL);

IMMDeviceEnumerator *pDeviceEnumerator = NULL;

IMMDevice *pDevice = NULL;

IAudioSessionManager2 *pAudioSessionManager2 = NULL;

IAudioSessionEnumerator *pAudioSessionEnumerator = NULL;

CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&pDeviceEnumerator);

pDeviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &pDevice);

pDevice->Activate(__uuidof(IAudioSessionManager2), CLSCTX_ALL, NULL, (void **) &pAudioSessionManager2);

pAudioSessionManager2->GetSessionEnumerator(&pAudioSessionEnumerator);

int nSessionCount;

pAudioSessionEnumerator->GetCount(&nSessionCount);

std::cout << "Session Count: " << nSessionCount << std::endl;

while (true) {

for (int nSessionIndex = 0; nSessionIndex < nSessionCount; nSessionIndex++) {

IAudioSessionControl *pSessionControl = NULL;

if (FAILED(pAudioSessionEnumerator->GetSession(nSessionIndex, &pSessionControl)))

continue;

IAudioMeterInformation *pAudioMeterInformation = NULL;

pSessionControl->QueryInterface(&pAudioMeterInformation);

float fPeak = NULL;

pAudioMeterInformation->GetPeakValue(&fPeak);

std::cout << "fPeak Value: " << fPeak << std::endl;

}

std::cout << "\n\n";

Sleep(1000);

}

CoUninitialize();

}

double getVolume() {

float currentVolume = 0;

CoInitialize(NULL);

IMMDeviceEnumerator *deviceEnumerator = NULL;

CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);

IMMDevice *defaultDevice = NULL;

deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &defaultDevice);

deviceEnumerator->Release();

deviceEnumerator = NULL;

IAudioEndpointVolume *endpointVolume = NULL;

defaultDevice->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);

defaultDevice->Release();

defaultDevice = NULL;

float fLevel;

endpointVolume->GetMasterVolumeLevel(&fLevel);

qDebug() << "FLevel: ";

qDebug() << fLevel;

endpointVolume->GetMasterVolumeLevelScalar(&currentVolume);

endpointVolume->Release();

CoUninitialize();

return (double)(currentVolume * 100);

}

好的,我找到了解决问题的方法！

我不得不在SessionControl上调用QueryInterface来访问ISimpleAudioVolume,您可以在其中使用GetMasterVolume和SetMasterVolume函数.它是0-1标量,但你可以将它乘以100得到0-100标量.如果系统的主音量为50％,如果程序音量也为50％,则输出为1,因此输出基于系统的主音量！

感谢您的每一条评论和帮助！

这里的工作代码：

void getSessions() {

CoInitialize(NULL);

IMMDeviceEnumerator *pDeviceEnumerator;

IMMDevice *pDevice;

IAudioSessionManager2 *pAudioSessionManager2;

IAudioSessionEnumerator *pAudioSessionEnumerator;

CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&pDeviceEnumerator);

pDeviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &pDevice);

pDevice->Activate(__uuidof(IAudioSessionManager2), CLSCTX_ALL, NULL, (void **) &pAudioSessionManager2);

pAudioSessionManager2->GetSessionEnumerator(&pAudioSessionEnumerator);

int nSessionCount;

pAudioSessionEnumerator->GetCount(&nSessionCount);

while (true) {

for (int nSessionIndex = 0; nSessionIndex < nSessionCount; nSessionIndex++) {

IAudioSessionControl *pSessionControl;

if (FAILED(pAudioSessionEnumerator->GetSession(nSessionIndex, &pSessionControl)))

continue;

ISimpleAudioVolume *pSimpleAudioVolume;

pSessionControl->QueryInterface(&pSimpleAudioVolume);

float fLevel;

pSimpleAudioVolume->GetMasterVolume(&fLevel);

std::cout << "fLevel Value: " << fLevel << std::endl;

}

Sleep(1000);

}

CoUninitialize();

}