如何在我的过滤器图形中添加Default Directsound设备 [英] how can i add a Default Directsound Device to my filter graph

问题描述

嗨伙计们：

我是一个关于Default Directsound Device的小谜题。< graphedit / Audio Rederers / Default Directsound Device>

如何在我的过滤器图形中添加Default Directsound设备，以便我的播放器可以正常工作。

任何人有任何想法或用于添加默认DirectSound设备到过滤器图表的链接只是帮助我！

hi guys:
i''m a little puzzle about "Default Directsound Device".< graphedit / Audio Rederers/ Default Directsound Device>
how can i add a Default Directsound Device to my filter graph so that my player can work correctly.
Anyone got any ideas or links for adding the Default DirectSound Device to filter graph just help me!

推荐答案

HRESULT CPlayer::AddDefaultDirectSoundDevice (	IFilterGraph *pfG,IBaseFilter ** ppF,
											  LPCWSTR wszName)
{
	HRESULT hr ;
	ICreateDevEnum *pSysDevEnum = NULL;
	hr = CoCreateInstance(CLSID_SystemDeviceEnum,NULL,CLSCTX_INPROC_SERVER,
		IID_ICreateDevEnum,(void**)&pSysDevEnum);

	if(FAILED(hr))
	{
		return hr; 
	}
	IEnumMoniker *pEnumCat = NULL;
	hr = pSysDevEnum->CreateClassEnumerator(CLSID_AudioRendererCategory, &pEnumCat, 0);

	if(hr ==S_OK)
	{
		IMoniker *pMoniker = NULL;
		ULONG cFetched;
		CString temp ;

		while(pEnumCat->Next(1, &pMoniker, &cFetched) == S_OK)
		{
			IPropertyBag *pPropBag;
			hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, 
				(void **)&pPropBag);
			if (SUCCEEDED(hr))
			{
				// To retrieve the filter's friendly name, do the following:
				VARIANT varName;
				VariantInit(&varName);
				hr = pPropBag->Read(L"FriendlyName", &varName, 0);
	
				if (SUCCEEDED(hr))
				{
					// Display the name in your UI somehow.
					temp.Format(TEXT("%s"),varName.bstrVal);
					if(temp.Compare(wszName)==0)
					{
						// To create an instance of the filter, do the following:
						IBaseFilter *pFilter;
						hr = pMoniker->BindToObject(NULL, NULL, IID_IBaseFilter,
							(void**)&pFilter);
						// Now add the filter to the graph. 
						hr = pfG->AddFilter(pFilter,wszName);
						if(SUCCEEDED(hr))
							*ppF=pFilter ;
						else
							pFilter->Release();
					}
				}
				VariantClear(&varName);		
				pPropBag->Release();
			}
			pMoniker->Release();
		}
		pEnumCat->Release();
	}
	pSysDevEnum->Release();
}

已添加< pre>标签以提高可读性 - Code-o-mat [/ EDIT]

Added <pre> tags for better readability - Code-o-mat [/EDIT]

这是图编辑的解决方案。

This is a solution from graph edit plus.

CComPtr<ibasefilter> CreateFilterByName(const WCHAR* filterName, const GUID& category)
{
	HRESULT hr = S_OK;
	CComPtr<icreatedevenum> pSysDevEnum;
	hr = pSysDevEnum.CoCreateInstance(CLSID_SystemDeviceEnum);
	if (hrcheck(hr, "Can't create System Device Enumerator"))
	{
		return NULL;
	}
	
	CComPtr<ienummoniker> pEnumCat;
	hr = pSysDevEnum->CreateClassEnumerator(category, &pEnumCat, 0);
	if (hr == S_OK)
	{
		CComPtr<imoniker> pMoniker;
		ULONG cFetched;
		while(pEnumCat->Next(1, &pMoniker, &cFetched) == S_OK)
		{
			CComPtr<ipropertybag> pPropBag;
			hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void * *)&pPropBag);
			if (SUCCEEDED(hr))
			{
				VARIANT varName;
				VariantInit(&varName);
				hr = pPropBag->Read(L"FriendlyName", &varName, 0);
				if (SUCCEEDED(hr))
				{
					if (wcscmp(filterName, varName.bstrVal)==0)
					{
						CComPtr<ibasefilter> pFilter;
						hr = pMoniker->BindToObject(NULL, NULL, IID_IBaseFilter, (void**)&pFilter);
						if (hrcheck(hr, "Can't bind moniker to filter object"))
							return NULL;
						return pFilter;
					}
				}
				VariantClear(&varName);
			}
			pMoniker.Release();
		}
	}
	return NULL;
}

使用：

And using:

DEFINE_GUID(CLSID_AudioRenderers,
0xE0F158E1, 0xCB04, 0x11D0, 0xBD, 0x4E, 0x00, 0xA0, 0xC9, 0x11, 0xCE, 0x86);

//add Default DirectSound Device
	CComPtr<IBaseFilter> pDefaultDirectSoundDevice = CreateFilterByName(L"Default DirectSound Device", CLSID_AudioRenderers);
	hr = pGraph->AddFilter(pDefaultDirectSoundDevice, L"Default DirectSound Device");
	CHECK_HR(hr, "Can't add Default DirectSound Device to graph");

如上所述这里 [ ^ ]：



音频渲染器类别包含两个额外的过滤器实例，命名为Default DirectSound Device和Default WaveOut Device。这些对应于默认声音设备，由用户通过控制面板选择。



所以我会说，枚举过滤并查找名为Default DirectSound Device的文件。

As stated here[^]:

The audio renderer category contains two additional filter instances, named "Default DirectSound Device" and "Default WaveOut Device." These correspond to the default sound device, as chosen by the user through the Control Panel.

So i''d say, enumerate the filters and look for one that is called "Default DirectSound Device".

这篇关于如何在我的过滤器图形中添加Default Directsound设备的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！