Sounds device preparation for recording:

Even we could achieve the prepare of recprding with sounds devices on the code of C on windowsapi.

Thank you very much of microsoft samples.

//---
// REFERENCE_TIME time units per second and per millisecond
#define REFTIMES_PER_SEC  10000000
#define REFTIMES_PER_MILLISEC  10000

#define EXIT_ON_ERROR(hres)  \
              if (FAILED(hres)) { goto Exit; }
#define SAFE_RELEASE(punk)  \
              if ((punk) != NULL)  \
                { (punk)->Release(); (punk) = NULL; }
//---
const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator);
const IID IID_IAudioClient = __uuidof(IAudioClient);
const IID IID_IAudioCaptureClient = __uuidof(IAudioCaptureClient);
//---
IMMDevice* pDevice = NULL;
IMMDeviceEnumerator* pEnumerator = NULL;
//---
IAudioClient* pAudioClient = NULL;
WAVEFORMATEX* pwfx = NULL;
REFERENCE_TIME hnsRequestedDuration = REFTIMES_PER_SEC;
UINT32 bufferFrameCount;
IAudioCaptureClient* pCaptureClient = NULL;
REFERENCE_TIME hnsActualDuration;
//---

//---

void sounds_recording() ;
HRESULT  sounds_recording_prepare();

HRESULT  sounds_recording_prepare()
{
    HRESULT hr;

    hr = CoCreateInstance(
        CLSID_MMDeviceEnumerator, NULL,
        CLSCTX_ALL, IID_IMMDeviceEnumerator,
        (void**)&pEnumerator);

    EXIT_ON_ERROR(hr)

        hr = pEnumerator->GetDefaultAudioEndpoint(
            eCapture, eConsole, &pDevice);
    EXIT_ON_ERROR(hr)

        hr = pDevice->Activate(
            IID_IAudioClient, CLSCTX_ALL,
            NULL, (void**)&pAudioClient);
    EXIT_ON_ERROR(hr)

        hr = pAudioClient->GetMixFormat(&pwfx);
    EXIT_ON_ERROR(hr)

        hr = pAudioClient->Initialize(
            AUDCLNT_SHAREMODE_SHARED,
            0,
            hnsRequestedDuration,
            0,
            pwfx,
            NULL);
    EXIT_ON_ERROR(hr)

        // Get the size of the allocated buffer.
        hr = pAudioClient->GetBufferSize(&bufferFrameCount);
    EXIT_ON_ERROR(hr)

        hr = pAudioClient->GetService(
            IID_IAudioCaptureClient,
            (void**)&pCaptureClient);
    EXIT_ON_ERROR(hr)

        // Notify the audio sink which format to use.
        //hr = pMySink->SetFormat(pwfx);
    EXIT_ON_ERROR(hr)

        // Calculate the actual duration of the allocated buffer.
        hnsActualDuration = (double)REFTIMES_PER_SEC *
        bufferFrameCount / pwfx->nSamplesPerSec;

Exit:
    return hr;
}