Esempi in C++ (Cpp) per LPDIRECTSOUNDCAPTUREBUFFER::GetCaps

Esempio n. 1

File: voice_record_dsound.cpp Progetto: RaisingTheDerp/raisingthebar

bool VoiceRecord_DSound::Init(int sampleRate)
{
	HRESULT hr;
	DSCBUFFERDESC dscDesc;
	DirectSoundCaptureCreateFn createFn;

	
	Term();


	WAVEFORMATEX recordFormat =
	{
		WAVE_FORMAT_PCM,		// wFormatTag
		1,						// nChannels
		sampleRate,				// nSamplesPerSec
		sampleRate*2,			// nAvgBytesPerSec
		2,						// nBlockAlign
		16,						// wBitsPerSample
		sizeof(WAVEFORMATEX)	// cbSize
	};


	
	// Load the DSound DLL.
	m_hInstDS = LoadLibrary("dsound.dll");
	if(!m_hInstDS)
		goto HandleError;

	createFn = (DirectSoundCaptureCreateFn)GetProcAddress(m_hInstDS, "DirectSoundCaptureCreate");
	if(!createFn)
		goto HandleError;

	hr = createFn(NULL, &m_pCapture, NULL);
	if(FAILED(hr))
		goto HandleError;

	// Create the capture buffer.
	memset(&dscDesc, 0, sizeof(dscDesc));
	dscDesc.dwSize = sizeof(dscDesc);
	dscDesc.dwFlags = 0;
	dscDesc.dwBufferBytes = recordFormat.nAvgBytesPerSec;
	dscDesc.lpwfxFormat = &recordFormat;

	hr = m_pCapture->CreateCaptureBuffer(&dscDesc, &m_pCaptureBuffer, NULL);
	if(FAILED(hr))
		goto HandleError;


	// Figure out how many bytes we got in our capture buffer.
	DSCBCAPS caps;
	memset(&caps, 0, sizeof(caps));
	caps.dwSize = sizeof(caps);

	hr = m_pCaptureBuffer->GetCaps(&caps);
	if(FAILED(hr))
		goto HandleError;

	m_nCaptureBufferBytes = caps.dwBufferBytes;


	// Set it up so we get notification when the buffer wraps.
	m_hWrapEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
	if(!m_hWrapEvent)
		goto HandleError;

	DSBPOSITIONNOTIFY dsbNotify;
	dsbNotify.dwOffset = dscDesc.dwBufferBytes - 1;
	dsbNotify.hEventNotify = m_hWrapEvent;
	
	// Get the IDirectSoundNotify interface.
	LPDIRECTSOUNDNOTIFY pNotify;
	hr = m_pCaptureBuffer->QueryInterface(IID_IDirectSoundNotify, (void**)&pNotify);
	if(FAILED(hr))
		goto HandleError;
	
	hr = pNotify->SetNotificationPositions(1, &dsbNotify);
	pNotify->Release();
	if(FAILED(hr))
		goto HandleError;

	// Start capturing.
	hr = m_pCaptureBuffer->Start(DSCBSTART_LOOPING);
	if(FAILED(hr))
		return false;

	return true;


HandleError:;
	Term();
	return false;
}