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video.cpp
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/*
Copyright (c) 2001-2004 Chris Lundie
http://lundie.ca/
This file is part of Fwink.
Fwink is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Fwink is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Fwink; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "WebCam.h"
#include <ctime>
#include <comdef.h>
// Open TV tuner properties
//
void
WebCam::TVTunerProperties(const HWND hwndParent, const bool bShowErrors)
{
if (!pBuilder) return;
HRESULT hr;
IAMTVTuner* pTuner = NULL;
hr = pBuilder->FindInterface(
&LOOK_UPSTREAM_ONLY,
NULL,
pVidcap,
IID_IAMTVTuner,
(void**)&pTuner);
if (FAILED(hr))
{
if (bShowErrors)
{
TCHAR buffer[512];
LoadString(GetModuleHandle(NULL), ERR_TVTUNERPROPERTIES, buffer, 512);
MessageBox(hwndParent, buffer, szAppname, MB_ICONEXCLAMATION);
}
return;
}
ISpecifyPropertyPages* pPropTuner = NULL;
pTuner->QueryInterface(IID_ISpecifyPropertyPages, (void **)&pPropTuner);
if (!pPropTuner)
{
pTuner->Release();
if (bShowErrors)
{
TCHAR buffer[512];
LoadString(GetModuleHandle(NULL), ERR_TVTUNERPROPERTIES, buffer, 512);
MessageBox(hwndParent, buffer, szAppname, MB_ICONEXCLAMATION);
}
return;
}
IUnknown* pFilterUnk;
CAUUID caGUID;
pTuner->QueryInterface(IID_IUnknown, (void **)&pFilterUnk);
pPropTuner->GetPages(&caGUID);
pPropTuner->Release();
pPropTuner = NULL;
// Show the page.
OleCreatePropertyFrame(
hwndParent, // Parent window
0, 0, // (Reserved)
OLESTR("TV Tuner"), // Caption for the dialog box
1, // Number of objects (just the filter)
&pFilterUnk, // Array of object pointers.
caGUID.cElems, // Number of property pages
caGUID.pElems, // Array of property page CLSIDs
0, // Locale identifier
0, NULL // Reserved
);
pFilterUnk->Release();
CoTaskMemFree(caGUID.pElems);
pTuner->Release();
}
// Open video format properties
//
void
WebCam::ChangeVideoFormat(const HWND hwndParent, const bool bShowErrors)
{
HRESULT hr;
IMediaControl* pMediaControl = NULL;
hr = pGraph->QueryInterface(IID_IMediaControl, (void**)(&pMediaControl));
if (SUCCEEDED(hr))
{
pMediaControl->Stop();
pMediaControl->Release();
}
NukeDownstream(pVidcap);
IPin* pinVidcapOut = GetPin(pVidcap, PINDIR_OUTPUT, PIN_CATEGORY_CAPTURE);
if (!pinVidcapOut)
{
if (bShowErrors)
{
TCHAR buffer[512];
LoadString(GetModuleHandle(NULL), ERR_MODIFYVIDEOFORMAT, buffer, 512);
MessageBox(hwndParent, buffer, szAppname, MB_ICONEXCLAMATION);
}
return;
}
ISpecifyPropertyPages* pPropVidcapOut = NULL;
pinVidcapOut->QueryInterface(IID_ISpecifyPropertyPages, (void **)&pPropVidcapOut);
if (!pPropVidcapOut)
{
pinVidcapOut->Release();
if (bShowErrors)
{
TCHAR buffer[512];
LoadString(GetModuleHandle(NULL), ERR_MODIFYVIDEOFORMAT, buffer, 512);
MessageBox(hwndParent, buffer, szAppname, MB_ICONEXCLAMATION);
}
return;
}
IUnknown* pFilterUnk;
CAUUID caGUID;
pinVidcapOut->QueryInterface(IID_IUnknown, (void **)&pFilterUnk);
pPropVidcapOut->GetPages(&caGUID);
pPropVidcapOut->Release();
pPropVidcapOut = NULL;
// Show the page.
OleCreatePropertyFrame(
hwndParent, // Parent window
0, 0, // (Reserved)
OLESTR("Video Format"), // Caption for the dialog box
1, // Number of objects (just the filter)
&pFilterUnk, // Array of object pointers.
caGUID.cElems, // Number of property pages
caGUID.pElems, // Array of property page CLSIDs
0, // Locale identifier
0, NULL // Reserved
);
pFilterUnk->Release();
CoTaskMemFree(caGUID.pElems);
pinVidcapOut->Release();
UnNuke();
}
// Open video capture properties
//
void
WebCam::ChangeVidcapProperties(const HWND hwndParent, const bool bShowErrors)
{
if (uDeviceType != deviceType_camera)
{
return;
}
ISpecifyPropertyPages* pPropVidcap = NULL;
pVidcap->QueryInterface(IID_ISpecifyPropertyPages, (void **)&pPropVidcap);
if (!pPropVidcap)
{
if (bShowErrors)
{
TCHAR buffer[512];
LoadString(GetModuleHandle(NULL), ERR_MODIFYVIDCAP, buffer, 512);
MessageBox(hwndParent, buffer, szAppname, MB_ICONEXCLAMATION);
}
return;
}
IUnknown* pFilterUnk;
CAUUID caGUID;
pVidcap->QueryInterface(IID_IUnknown, (void **)&pFilterUnk);
pPropVidcap->GetPages(&caGUID);
pPropVidcap->Release();
pPropVidcap = NULL;
// Show the page.
OleCreatePropertyFrame(
hwndParent, // Parent window
0, 0, // (Reserved)
OLESTR("Image"), // Caption for the dialog box
1, // Number of objects (just the filter)
&pFilterUnk, // Array of object pointers.
caGUID.cElems, // Number of property pages
caGUID.pElems, // Array of property page CLSIDs
0, // Locale identifier
0, NULL // Reserved
);
pFilterUnk->Release();
CoTaskMemFree(caGUID.pElems);
}
void
WebCam::UploadImage(void)
{
::KillTimer(hwndMain, uCancelFtpTimerID);
if (hFTP)
{
InternetCloseHandle(hFTP);
hFTP = NULL;
}
if (bTempFile)
{
DeleteFile(szwFilenameJPEG);
bTempFile = false;
}
HRESULT hr;
// Stream interface for bitmap
//
IStream* pBitmapStream = NULL;
if (uDeviceType == deviceType_camera)
{
// Get sample grabber interface
//
ISampleGrabber *pGrabber = NULL;
hr = pSampleGrabber->QueryInterface(IID_ISampleGrabber,
reinterpret_cast<void**>(&pGrabber));
if (FAILED(hr))
{
return;
}
try
{
// Get size of captured frame
//
long lBufferSize = 0;
hr = pGrabber->GetCurrentBuffer(&lBufferSize, NULL);
if (FAILED(hr))
{
throw 0;
}
// Allocate memory for captured frame
//
void* pBuffer = new char[lBufferSize];
try
{
// Get captured frame
//
hr = pGrabber->GetCurrentBuffer(&lBufferSize, (long*)pBuffer);
if (FAILED(hr))
{
throw 0;
}
// Get media type
AM_MEDIA_TYPE MediaType;
ZeroMemory(&MediaType, sizeof(MediaType));
hr = pGrabber->GetConnectedMediaType(&MediaType);
if (FAILED(hr)) throw 0;
try
{
// Get a pointer to the video header
VIDEOINFOHEADER *pVideoHeader = (VIDEOINFOHEADER*)MediaType.pbFormat;
if (pVideoHeader == NULL) throw 0;
// Create a bitmap file header
BITMAPFILEHEADER BmpFileHeader;
BmpFileHeader.bfType = MAKEWORD('B','M');
BmpFileHeader.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)
+ pVideoHeader->bmiHeader.biSizeImage;
BmpFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
BmpFileHeader.bfReserved1 = 0;
BmpFileHeader.bfReserved2 = 0;
// Create stream
hr = CreateStreamOnHGlobal(NULL, TRUE, &pBitmapStream);
if (FAILED(hr)) throw 0;
ULARGE_INTEGER ularge;
ularge.QuadPart = BmpFileHeader.bfSize;
pBitmapStream->SetSize(ularge);
LARGE_INTEGER ilarge;
ilarge.QuadPart = 0;
pBitmapStream->Seek(ilarge, STREAM_SEEK_SET, NULL);
pBitmapStream->Write(&BmpFileHeader, sizeof(BITMAPFILEHEADER), NULL);
pBitmapStream->Write(&(pVideoHeader->bmiHeader), sizeof(BITMAPINFOHEADER), NULL);
pBitmapStream->Write(pBuffer, lBufferSize, NULL);
}
catch(int)
{
}
FreeMediaType(MediaType);
}
catch(int)
{
}
delete[] pBuffer;
}
catch (int)
{
}
pGrabber->Release();
pGrabber = NULL;
if (!pBitmapStream) return;
}
else if (uDeviceType == deviceType_file)
{
}
else
{
assert(false);
}
TCHAR* szPathname = new TCHAR[MAX_PATH];
try
{
// Get temporary path name
//
DWORD dwPathSize = GetTempPath(MAX_PATH, szPathname);
if (dwPathSize == 0)
{
SetStatus(ERR_CAPTURE);
throw 0;
}
if (dwPathSize > MAX_PATH)
{
delete[] szPathname;
szPathname = new TCHAR[dwPathSize];
DWORD dwNewPathSize = GetTempPath(dwPathSize, szPathname);
if ((dwNewPathSize == 0) || (dwNewPathSize > dwPathSize))
{
SetStatus(ERR_CAPTURE);
throw 0;
}
}
// Create Image object
//
Image* image = NULL;
if (uDeviceType == deviceType_camera)
{
image = Bitmap::FromStream(pBitmapStream);
pBitmapStream->Release();
pBitmapStream = NULL;
}
else if (uDeviceType == deviceType_file)
{
if (imageFile.get())
{
image = imageFile->Clone();
}
}
if (image && (Ok == image->GetLastStatus()))
{
Bitmap* image2 = new Bitmap(uImageWidth, uImageHeight, PixelFormat24bppRGB);
if (image2)
{
Graphics* g2 = Graphics::FromImage(image2);
if (g2)
{
g2->SetInterpolationMode(InterpolationModeHighQualityBicubic);
if (!bCrop)
{
g2->DrawImage(image, 0, 0, uImageWidth, uImageHeight);
}
else
{
g2->DrawImage(
image,
RectF(0., 0., (REAL)uImageWidth, (REAL)uImageHeight),
(REAL)uCropX, (REAL)uCropY,
(REAL)uCropWidth, (REAL)uCropHeight,
UnitPixel,
NULL,
NULL,
NULL
);
}
delete g2;
g2 = NULL;
}
delete image;
image = image2;
image2 = NULL;
}
// Flip image
if (bFlipHorizontal)
{
image->RotateFlip(RotateNoneFlipX);
}
if (bFlipVertical)
{
image->RotateFlip(RotateNoneFlipY);
}
// Add overlay to image
AddOverlay(image, NULL, false, uOverlayOpacity,
uOverlayScale,
(float)uOverlayScalePercent, (float)uOverlayScalePercent,
bOverlayColourKey,
GetRValue(rgbColourKey), GetGValue(rgbColourKey), GetBValue(rgbColourKey),
uOverlayPosition
);
// Add text to image
AddText(image);
IStream* pBMPStream = NULL;
CreateStreamOnHGlobal(NULL, TRUE, &pBMPStream);
if (pBMPStream)
{
CLSID idBMPEncoder;
GetEncoderClsid(L"image/bmp", &idBMPEncoder);
image->Save(pBMPStream, &idBMPEncoder);
delete image;
image = Bitmap::FromStream(pBMPStream);
pBMPStream->Release();
pBMPStream = NULL;
}
// Create a temporary file for the JPEG image.
UINT uUnique = GetTempFileName(szPathname, TEXT("cam"), 0, szwFilenameJPEG);
if (uUnique)
{
bTempFile = true;
// Get the class id of the JPEG encoder
//
CLSID idEncoder;
int iGotEncoder = GetEncoderClsid(L"image/jpeg", &idEncoder);
// Set JPEG compression quality
//
ULONG quality = uJPEGQuality;
EncoderParameters p;
p.Count = 1;
p.Parameter[0].Guid = EncoderQuality;
p.Parameter[0].Type = EncoderParameterValueTypeLong;
p.Parameter[0].NumberOfValues = 1;
p.Parameter[0].Value = &quality;
// Save the JPEG image
//
if (Ok == image->Save(szwFilenameJPEG, &idEncoder, &p))
{
// Save local file.
//
if (bSaveToFile)
{
CopyFile(szwFilenameJPEG, sLocalFilename.c_str(), FALSE);
if (bOneShot && bDisableFTP)
{
SendMessage(hwndMain, uQuitMessage, 0, 0);
}
}
// Start FTP session
//
if (!bDisableFTP)
{
if (bReadyToUpload && ConnectedToInternet()
&& (sServer.length() > 1) && (sServer[0] != 0) )
{
DWORD dwFlags = 0;
if (bPassiveFTP) dwFlags |= INTERNET_FLAG_PASSIVE;
SetStatus(STATUS_CONNECTING);
InternetConnect(
hInternet,
sServer.c_str(),
INTERNET_DEFAULT_FTP_PORT,
sUsername.c_str(),
sPassword.c_str(),
INTERNET_SERVICE_FTP,
dwFlags,
reinterpret_cast<DWORD_PTR>(this));
}
else if (bOneShot)
{
SendMessage(hwndMain, uQuitMessage, 0, 0);
}
}
}
else
{
// Image not saved! Uh oh.
SetStatus(ERR_CAPTURE);
}
}
}
if (image)
delete image;
image = NULL;
}
catch(int)
{
}
delete[] szPathname;
szPathname = NULL;
}
void
WebCam::CaptureFrame(void)
{
if (uDeviceType == deviceType_file)
{
InitImageFile();
if (bDisableFTP && !bSaveToFile && bOneShot)
{
SendMessage(hwndMain, uQuitMessage, 0, 0);
return;
}
UploadImage();
}
else if (uDeviceType == deviceType_camera)
{
/*
if (time(NULL) > _expireTime)
{
throw ERR_EXPIRED;
}
*/
if ((bDisableFTP && !bSaveToFile) || !pSampleGrabber)
{
if (bOneShot) SendMessage(hwndMain, uQuitMessage, 0, 0);
return;
}
HRESULT hr;
// Get sample grabber interface
//
ISampleGrabber *pGrabber = NULL;
hr = pSampleGrabber->QueryInterface(IID_ISampleGrabber,
reinterpret_cast<void**>(&pGrabber));
if (FAILED(hr))
{
if (bOneShot) SendMessage(hwndMain, uQuitMessage, 0, 0);
return;
}
IMediaEventEx* pEvent = NULL;
hr = pGraph->QueryInterface(IID_IMediaEventEx, (void**)&pEvent);
if (FAILED(hr))
{
pGrabber->Release();
pGrabber = NULL;
if (bOneShot) SendMessage(hwndMain, uQuitMessage, 0, 0);
return;
}
// Start buffering samples
//
pEvent->CancelDefaultHandling(EC_COMPLETE);
pEvent->SetNotifyFlags(0);
pGrabber->SetOneShot(TRUE);
pGrabber->SetBufferSamples(TRUE);
StartCapture();
pEvent->Release();
pEvent = NULL;
pGrabber->Release();
pGrabber = NULL;
}
}
void
WebCam::StopCapture(void)
{
if (!pGraph) return;
IMediaControl* pMediaControl = NULL;
if (SUCCEEDED(pGraph->QueryInterface(IID_IMediaControl, (void**)(&pMediaControl))))
{
pMediaControl->Stop();
pMediaControl->Release();
}
}
void
WebCam::StartCapture(void)
{
if (!pGraph) return;
IMediaControl* pMediaControl = NULL;
if (SUCCEEDED(pGraph->QueryInterface(IID_IMediaControl, (void**)(&pMediaControl))))
{
pMediaControl->Stop();
pMediaControl->Run();
pMediaControl->Release();
}
}
int
WebCam::GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
UINT num = 0; // number of image encoders
UINT size = 0; // size of the image encoder array in bytes
ImageCodecInfo* pImageCodecInfo = NULL;
GetImageEncodersSize(&num, &size);
if(size == 0)
return -1; // Failure
pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
if(pImageCodecInfo == NULL)
return -1; // Failure
GetImageEncoders(num, size, pImageCodecInfo);
for(UINT j = 0; j < num; ++j)
{
if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
{
*pClsid = pImageCodecInfo[j].Clsid;
free(pImageCodecInfo);
return j; // Success
}
}
free(pImageCodecInfo);
return -1; // Failure
}
HRESULT
WebCam::GetPinCategory(IPin* pPin, GUID* pPinCategory)
{
IKsPropertySet *pKs;
HRESULT hr = pPin->QueryInterface(IID_IKsPropertySet, (void **)&pKs);
if (SUCCEEDED(hr))
{
DWORD cbReturned;
hr = pKs->Get(AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY, NULL, 0,
pPinCategory, sizeof(GUID), &cbReturned);
pKs->Release();
if (SUCCEEDED(hr))
{
return S_OK;
}
}
return E_FAIL;
}
IPin*
WebCam::GetPin(IBaseFilter *pFilter, PIN_DIRECTION PinDir, unsigned iIndex)
{
BOOL bFound = FALSE;
IEnumPins *pEnum;
IPin *pPin;
unsigned i = 0;
pFilter->EnumPins(&pEnum);
while(pEnum->Next(1, &pPin, 0) == S_OK)
{
PIN_DIRECTION PinDirThis;
pPin->QueryDirection(&PinDirThis);
if (PinDir == PinDirThis)
{
if (i == iIndex)
{
bFound = TRUE;
break;
}
++i;
}
pPin->Release();
}
pEnum->Release();
return (bFound ? pPin : 0);
}
IPin*
WebCam::GetPin(IBaseFilter *pFilter, PIN_DIRECTION PinDir, const GUID& PinCategory)
{
BOOL bFound = FALSE;
IEnumPins *pEnum;
IPin *pPin;
pFilter->EnumPins(&pEnum);
while(pEnum->Next(1, &pPin, 0) == S_OK)
{
PIN_DIRECTION PinDirThis;
pPin->QueryDirection(&PinDirThis);
if (PinDir == PinDirThis)
{
GUID ThisCategory;
HRESULT hr = GetPinCategory(pPin, &ThisCategory);
if ((SUCCEEDED(hr)) && (IsEqualGUID(ThisCategory, PinCategory)))
{
bFound = TRUE;
break;
}
}
pPin->Release();
}
pEnum->Release();
return (bFound ? pPin : 0);
}
void WebCam::InitImageFile(void)
{
std::auto_ptr<Image> i(Image::FromFile(sDevicePath.c_str()));
if (i->GetLastStatus() != Ok)
{
return;
}
std::auto_ptr<Bitmap> b(new Bitmap(i->GetWidth(), i->GetHeight()));
std::auto_ptr<Graphics> g(new Graphics(b.get()));
g->DrawImage(i.get(), 0, 0, i->GetWidth(), i->GetHeight());
g.reset();
i.reset();
imageFile.reset(b.get());
b.release();
RECT rVideoWindow;
GetClientRect(GetDlgItem(hwndMain, IDC_PREVIEW), &rVideoWindow);
LONG windowWidth = rVideoWindow.right - rVideoWindow.left;
LONG windowHeight = rVideoWindow.bottom - rVideoWindow.top;
float aspectRatio = (float)imageFile->GetWidth() / (float)imageFile->GetHeight();
long destWidth, destHeight;
if (aspectRatio * windowHeight > windowWidth)
{
destWidth = windowWidth;
destHeight = (long)((float)destWidth / aspectRatio);
}
else
{
destHeight = windowHeight;
destWidth = (long)((float)destHeight * aspectRatio);
}
imageFilePreview.reset(new Bitmap(destWidth, destHeight));
g.reset(new Graphics(imageFilePreview.get()));
g->DrawImage(imageFile.get(), 0, 0, destWidth, destHeight);
g.reset();
HBITMAP hbm;
if (Ok != imageFilePreview->GetHBITMAP(Color::Color(0, 255, 255, 255), &hbm))
{
return;
}
HBITMAP oldBitmap = (HBITMAP)SendDlgItemMessage(hwndMain, IDC_PREVIEW, STM_SETIMAGE, (WPARAM)IMAGE_BITMAP, (LPARAM)(HANDLE)hbm);
if (oldBitmap)
{
DeleteBitmap(oldBitmap);
}
}
void
WebCam::InitDirectShow(void)
{
HRESULT hr;
// Create the Filter Graph Manager.
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC,
IID_IGraphBuilder, (void **)&pGraph);
if (FAILED(hr))
throw ERR_CREATEGRAPHBUILDER;
// Create the capture graph builder
//
hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC,
IID_ICaptureGraphBuilder2, (void **)&pBuilder);
if (FAILED(hr))
throw ERR_CREATECAPTUREGRAPHBUILDER;
pBuilder->SetFiltergraph(pGraph);
// Create the system device enumerator.
ICreateDevEnum *pDevEnum = NULL;
CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC,
IID_ICreateDevEnum, (void **)&pDevEnum);
if (!pDevEnum)
throw ERR_NOVIDEOCAPTURE;
// Create an enumerator for video capture devices.
IEnumMoniker *pClassEnum = NULL;
pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pClassEnum, 0);
if (!pClassEnum)
{
pDevEnum->Release();
throw ERR_NOVIDEOCAPTURE;
}
ULONG cFetched;
IMoniker *pMoniker = NULL;
wstring newDevicePath, newDeviceName;
while (pClassEnum->Next(1, &pMoniker, &cFetched) == S_OK)
{
wstring friendlyName, devicePath;
// Get the property bag of the moniker
{
IPropertyBagPtr propBag;
hr = pMoniker->BindToStorage(NULL, NULL, IID_IPropertyBag,
reinterpret_cast<void**>(&propBag));
if (FAILED(hr))
{
pMoniker->Release();
continue;
}
_variant_t v;
hr = propBag->Read(L"Description", &v, 0);
if (FAILED(hr))
{
hr = propBag->Read(L"FriendlyName", &v, 0);
}
if (S_OK == hr)
{
friendlyName = v.bstrVal;
}
hr = propBag->Read(L"DevicePath", &v, 0);
if (S_OK == hr)
{
devicePath = v.bstrVal;
}
}
// Bind the first moniker to a filter object.
if (pVidcap == NULL)
{
pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pVidcap);
newDeviceName = friendlyName;
newDevicePath = devicePath;
}
else if (
(devicePath == this->sDevicePath)
||
(this->sDevicePath.empty() && !devicePath.compare(0, 8, L"\\\\?\\usb#"))
)
{
if (pVidcap)
{
pVidcap->Release();
pVidcap = NULL;
}
pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pVidcap);
newDeviceName = friendlyName;
newDevicePath = devicePath;
}
pMoniker->Release();
}
pClassEnum->Release();
pDevEnum->Release();
this->sDeviceName = newDeviceName;
this->sDevicePath = newDevicePath;
SaveSetting(L"devicePath", newDevicePath.c_str());
if (!pVidcap)
throw ERR_NOVIDEOCAPTURE;
// add video capture to graph
//
hr = pGraph->AddFilter(pVidcap, L"vidcap");
if (FAILED(hr))
throw ERR_ADDVIDEOCAPTURE;
// Set video capture size
SetCaptureSize();
// create sample grabber
hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC,
IID_IBaseFilter, (void **)&pSampleGrabber);
if (FAILED(hr))
throw ERR_CREATEGRABBER;
// add sample grabber to graph
//
hr = pGraph->AddFilter(pSampleGrabber, L"sample grabber");
if (FAILED(hr))
throw ERR_ADDGRABBER;
// set media format of sample grabber
ISampleGrabber *pGrabber = NULL;
hr = pSampleGrabber->QueryInterface(IID_ISampleGrabber,
reinterpret_cast<void**>(&pGrabber));
if (FAILED(hr))
throw ERR_QUERYGRABBER;
try
{
AM_MEDIA_TYPE mt;
ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));
mt.majortype = MEDIATYPE_Video;
mt.subtype = MEDIASUBTYPE_RGB24;
hr = pGrabber->SetMediaType(&mt);
if (FAILED(hr))
throw ERR_SETMEDIATYPE;
}
catch(...)
{
pGrabber->Release();
throw;
}
pGrabber->Release();
// create null renderer
hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC,
IID_IBaseFilter, (void **)&pNullRenderer);
if (FAILED(hr))
throw ERR_CREATENULLRENDERER;
// add null renderer to graph
//
hr = pGraph->AddFilter(pNullRenderer, L"null renderer");
if (FAILED(hr))
throw ERR_ADDNULLRENDERER;
// send video preview to renderer
//
hr = pBuilder->RenderStream(&PIN_CATEGORY_PREVIEW,
&MEDIATYPE_Video,
pVidcap,
NULL,
NULL);
// send video capture to null renderer
//
hr = pBuilder->RenderStream(&PIN_CATEGORY_CAPTURE,
&MEDIATYPE_Video,
pVidcap,
NULL,
pNullRenderer);
// insert sample grabber in front of null renderer
//
// get null renderer input pin
//
IPin* pinNullIn = GetPin(pNullRenderer, PINDIR_INPUT, 0);
if (pinNullIn)
{
// get pin that null renderer input pin is connected to
IPin* pinBeforeNull;
hr = pinNullIn->ConnectedTo(&pinBeforeNull);
if (SUCCEEDED(hr) && pinBeforeNull)
{