捕获源过滤器 - 更改分辨率 [英] Capture Source Filter - Change Resolution
问题描述
我是Directshow Development的新手，我真的不需要了解太多。
I am pretty new to Directshow Development and I don't really need to know that much about it.
我修改了 示例 从http://tmhare.mvps.org/downloads.htm捕获源过滤器以使用图像文件。
实际上这就是我现在所需要的全部内容！
I modified the sample Capture Source Filter from http://tmhare.mvps.org/downloads.htm to use an image file.
Actually that is all I need for now!
默认媒体类型设置为320x240。
The default media type is set to 320x240.
现在我正在使用 VIDEOINFOHEADER和VIDEO_STREAM_CONFIG_CAPS属性将分辨率更改为我的图像分辨率。
但我无法弄清楚我必须更改哪些值。
Now I was playing around with the VIDEOINFOHEADER and VIDEO_STREAM_CONFIG_CAPS properties to change the resolution to my image resolution.
But I could not figure out which values I have to change.
欢呼
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Filters.cpp：
Filters.cpp:
CVCamStream::CVCamStream(HRESULT *phr, CVCam *pParent, LPCWSTR pPinName) :
CSourceStream(NAME("Virtual Cam"),phr, pParent, pPinName), m_pParent(pParent)
{
// Set the default media type as 320x240x24@15
GetMediaType(4, &m_mt);
}
HRESULT CVCamStream :: GetMediaType（int iPosition，CMediaType * pmt）
{
if（iPosition< 0）返回E_INVALIDARG;
if（iPosition> 8）返回VFW_S_NO_MORE_ITEMS;
if（iPosition == 0）
{
* pmt = m_mt;
返回S_OK;
}
DECLARE_PTR（VIDEOINFOHEADER，pvi，pmt-> AllocFormatBuffer（sizeof（VIDEOINFOHEADER）））;
ZeroMemory（pvi，sizeof（VIDEOINFOHEADER））;
pvi-> bmiHeader.biCompression = BI_RGB;
pvi-> bmiHeader.biBitCount = 24;
pvi-> bmiHeader.biSize = sizeof（BITMAPINFOHEADER）;
pvi-> bmiHeader.biWidth = 80 * iPosition;
pvi-> bmiHeader.biHeight = 60 * iPosition;
pvi-> bmiHeader.biPlanes = 1;
pvi-> bmiHeader.biSizeImage = GetBitmapSize（& pvi-> bmiHeader）;
pvi-> bmiHeader.biClrImportant = 0;
pvi-> AvgTimePerFrame = 1000000;
SetRectEmpty（&（pvi-> rcSource））; //我们想要渲染整个图像区域。
SetRectEmpty（&（pvi-> rcTarget））; //没有特定的目标矩形
pmt-> SetType（& MEDIATYPE_Video）;
pmt-> SetFormatType（& FORMAT_VideoInfo）;
pmt-> SetTemporalCompression（FALSE）;
//从标题信息中计算出子类型的GUID。
const GUID SubTypeGUID = GetBitmapSubtype（& pvi-> bmiHeader）;
pmt-> SetSubtype（& SubTypeGUID）;
pmt-> SetSampleSize（pvi-> bmiHeader.biSizeImage）;
返回NOERROR;
} // GetMediaType
HRESULT CVCamStream :: CheckMediaType（const CMediaType * pMediaType）
{
VIDEOINFOHEADER * pvi =（VIDEOINFOHEADER *）（pMediaType - >格式（））;
if（* pMediaType！= m_mt）
返回E_INVALIDARG;
返回S_OK;
}
HRESULT CVCamStream::GetMediaType(int iPosition, CMediaType *pmt) { if(iPosition < 0) return E_INVALIDARG; if(iPosition > 8) return VFW_S_NO_MORE_ITEMS; if(iPosition == 0) { *pmt = m_mt; return S_OK; } DECLARE_PTR(VIDEOINFOHEADER, pvi, pmt->AllocFormatBuffer(sizeof(VIDEOINFOHEADER))); ZeroMemory(pvi, sizeof(VIDEOINFOHEADER)); pvi->bmiHeader.biCompression = BI_RGB; pvi->bmiHeader.biBitCount = 24; pvi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); pvi->bmiHeader.biWidth = 80 * iPosition; pvi->bmiHeader.biHeight = 60 * iPosition; pvi->bmiHeader.biPlanes = 1; pvi->bmiHeader.biSizeImage = GetBitmapSize(&pvi->bmiHeader); pvi->bmiHeader.biClrImportant = 0; pvi->AvgTimePerFrame = 1000000; SetRectEmpty(&(pvi->rcSource)); // we want the whole image area rendered. SetRectEmpty(&(pvi->rcTarget)); // no particular destination rectangle pmt->SetType(&MEDIATYPE_Video); pmt->SetFormatType(&FORMAT_VideoInfo); pmt->SetTemporalCompression(FALSE); // Work out the GUID for the subtype from the header info. const GUID SubTypeGUID = GetBitmapSubtype(&pvi->bmiHeader); pmt->SetSubtype(&SubTypeGUID); pmt->SetSampleSize(pvi->bmiHeader.biSizeImage); return NOERROR; } // GetMediaType HRESULT CVCamStream::CheckMediaType(const CMediaType *pMediaType) { VIDEOINFOHEADER *pvi = (VIDEOINFOHEADER *)(pMediaType->Format()); if(*pMediaType != m_mt) return E_INVALIDARG; return S_OK; }
HRESULT STDMETHODCALLTYPE CVCamStream :: GetStreamCaps（int iIndex，AM_MEDIA_TYPE ** pmt，BYTE * pSCC）
{
* pmt = CreateMediaType（& m_mt）;
DECLARE_PTR（VIDEOINFOHEADER，pvi，（* pmt） - > pbFormat）;
if（iIndex == 0）iIndex = 4;
pvi-> bmiHeader.biCompression = BI_RGB;
pvi-> bmiHeader.biBitCount = 24;
pvi-> bmiHeader.biSize = sizeof（BITMAPINFOHEADER）;
pvi-> bmiHeader.biWidth = 80 * iIndex;
pvi-> bmiHeader.biHeight = 60 * iIndex;
pvi-> bmiHeader.biPlanes = 1;
pvi-> bmiHeader.biSizeImage = GetBitmapSize（& pvi-> bmiHeader）;
pvi-> bmiHeader.biClrImportant = 0;
SetRectEmpty（&（pvi-> rcSource））; //我们想要渲染整个图像区域。
SetRectEmpty（&（pvi-> rcTarget））; //没有特定的目标矩形
（* pmt） - > majortype = MEDIATYPE_Video;
（* pmt） - > subtype = MEDIASUBTYPE_RGB24;
（* pmt） - > formattype = FORMAT_VideoInfo;
（* pmt） - > bTemporalCompression = FALSE;
（* pmt） - > bFixedSizeSamples = FALSE;
（* pmt） - > lSampleSize = pvi-> bmiHeader.biSizeImage;
（* pmt） - > cbFormat = sizeof（VIDEOINFOHEADER）;
DECLARE_PTR（VIDEO_STREAM_CONFIG_CAPS，pvscc，pSCC）;
pvscc-> guid = FORMAT_VideoInfo;
pvscc-> VideoStandard = AnalogVideo_None;
pvscc-> InputSize.cx = 640;
pvscc-> InputSize.cy = 480;
pvscc-> MinCroppingSize.cx = 80;
pvscc-> MinCroppingSize.cy = 60;
pvscc-> MaxCroppingSize.cx = 640;
pvscc-> MaxCroppingSize.cy = 480;
pvscc-> CropGranularityX = 80;
pvscc-> CropGranularityY = 60;
pvscc-> CropAlignX = 0;
pvscc-> CropAlignY = 0;
pvscc-> MinOutputSize.cx = 80;
pvscc-> MinOutputSize.cy = 60;
pvscc-> MaxOutputSize.cx = 640;
pvscc-> MaxOutputSize.cy = 480;
pvscc-> OutputGranularityX = 0;
pvscc-> OutputGranularityY = 0;
pvscc-> StretchTapsX = 0;
pvscc-> StretchTapsY = 0;
pvscc-> ShrinkTapsX = 0;
pvscc-> ShrinkTapsY = 0;
pvscc-> MinFrameInterval = 200000; // 50 fps
pvscc-> MaxFrameInterval = 50000000; // 0.2 fps
pvscc-> MinBitsPerSecond =（80 * 60 * 3 * 8）/ 5;
pvscc-> MaxBitsPerSecond = 640 * 480 * 3 * 8 * 50;
返回S_OK;
}
HRESULT STDMETHODCALLTYPE CVCamStream::GetStreamCaps(int iIndex, AM_MEDIA_TYPE **pmt, BYTE *pSCC)
{
*pmt = CreateMediaType(&m_mt);
DECLARE_PTR(VIDEOINFOHEADER, pvi, (*pmt)->pbFormat);
if (iIndex == 0) iIndex = 4;
pvi->bmiHeader.biCompression = BI_RGB;
pvi->bmiHeader.biBitCount = 24;
pvi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pvi->bmiHeader.biWidth = 80 * iIndex;
pvi->bmiHeader.biHeight = 60 * iIndex;
pvi->bmiHeader.biPlanes = 1;
pvi->bmiHeader.biSizeImage = GetBitmapSize(&pvi->bmiHeader);
pvi->bmiHeader.biClrImportant = 0;
SetRectEmpty(&(pvi->rcSource)); // we want the whole image area rendered.
SetRectEmpty(&(pvi->rcTarget)); // no particular destination rectangle
(*pmt)->majortype = MEDIATYPE_Video;
(*pmt)->subtype = MEDIASUBTYPE_RGB24;
(*pmt)->formattype = FORMAT_VideoInfo;
(*pmt)->bTemporalCompression = FALSE;
(*pmt)->bFixedSizeSamples= FALSE;
(*pmt)->lSampleSize = pvi->bmiHeader.biSizeImage;
(*pmt)->cbFormat = sizeof(VIDEOINFOHEADER);
DECLARE_PTR(VIDEO_STREAM_CONFIG_CAPS, pvscc, pSCC);
pvscc->guid = FORMAT_VideoInfo;
pvscc->VideoStandard = AnalogVideo_None;
pvscc->InputSize.cx = 640;
pvscc->InputSize.cy = 480;
pvscc->MinCroppingSize.cx = 80;
pvscc->MinCroppingSize.cy = 60;
pvscc->MaxCroppingSize.cx = 640;
pvscc->MaxCroppingSize.cy = 480;
pvscc->CropGranularityX = 80;
pvscc->CropGranularityY = 60;
pvscc->CropAlignX = 0;
pvscc->CropAlignY = 0;
pvscc->MinOutputSize.cx = 80;
pvscc->MinOutputSize.cy = 60;
pvscc->MaxOutputSize.cx = 640;
pvscc->MaxOutputSize.cy = 480;
pvscc->OutputGranularityX = 0;
pvscc->OutputGranularityY = 0;
pvscc->StretchTapsX = 0;
pvscc->StretchTapsY = 0;
pvscc->ShrinkTapsX = 0;
pvscc->ShrinkTapsY = 0;
pvscc->MinFrameInterval = 200000; //50 fps
pvscc->MaxFrameInterval = 50000000; // 0.2 fps
pvscc->MinBitsPerSecond = (80 * 60 * 3 * 8) / 5;
pvscc->MaxBitsPerSecond = 640 * 480 * 3 * 8 * 50;
return S_OK;
}
推荐答案
老实说，如果你不这样做知道DirectShow然后你最好不要学习它。这是一个弃用的API。
To be honest, if you don't know DirectShow then you are better off not learning it. It is a deprecated API.
你会更好地学习
Microsoft Media Foundation 做你想做的事。
You would do much better to learn the Microsoft Media Foundation to do what you are trying to do.
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