Friday, March 30, 2007

S.No

Tasks completed


1

sample application for loading JPEG,BMP images using Windows SDK

VC++

2

Source Filter for displaying numbers on the screen…

completed

3

Source filter for displaying the image file Source

completed



30 –March-2007….


Problems faced …


Directshow Source Filter development :


While developing the filter I got The error as the


I developed the source filter for displaying numbers on the screen...


The code related to this ...


But I faced the following problem...


---------------------------

GraphEdit

---------------------------

Sorry, the Filter Graph cannot render this pin.


Class not registered (Return code: 0x80040154)

---------------------------

OK

---------------------------




HRESULT CMySourceStream::GetMediaType(CMediaType* pMediaType)

{

try

{


HRESULT hr = S_OK;


CheckPointer(pMediaType,E_POINTER);

OutputDebugString("n CMySourceStream::GetMediaType() fn");

ZeroMemory(pMediaType,sizeof(CMediaType));


VIDEOINFO *pvi = (VIDEOINFO*)pMediaType->AllocFormatBuffer(sizeof(VIDEOINFO));


pvi->bmiHeader.biCompression = BI_RGB;

pvi->bmiHeader.biBitCount = 24;

pvi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

pvi->bmiHeader.biWidth = 300;

pvi->bmiHeader.biHeight = 300;


pvi->bmiHeader.biPlanes = 1;

pvi->bmiHeader.biSizeImage = pvi->bmiHeader.biWidth * pvi->bmiHeader.biHeight * (pvi->bmiHeader.biBitCount/8);

pvi->bmiHeader.biClrImportant = 0;


SetRectEmpty(&(pvi->rcSource));

SetRectEmpty(&(pvi->rcTarget));

pMediaType->SetType(&MEDIATYPE_Video);

pMediaType->SetFormatType(&FORMAT_VideoInfo);

pMediaType->SetTemporalCompression(FALSE);


//pMediaType->SetSubtype(&MEDIASUBTYPE_Vi)

const GUID SubTypeGUID = GetBitmapSubtype(&pvi->bmiHeader);

pMediaType->SetSubtype(&SubTypeGUID);

pMediaType->SetSampleSize(pvi->bmiHeader.biSizeImage);


m_bmpInfo.bmiHeader = pvi->bmiHeader;


return hr;

}

catch(...)

{

OutputDebugString("n Errror in CMySourceStream::GetMediaType() fn");

return E_FAIL;


}

}





Solution :

--------------

1.I added the checkMediaType() fn as follows...


CheckMediaType() is an important Function for any filter....


without it, the filter will not work...


HRESULT CMySourceStream::CheckMediaType(const CMediaType *pMediaType)

{

CheckPointer(pMediaType,E_POINTER);

try

{

OutputDebugString("n CheckMediaType fn...");

if((*(pMediaType->Type()) != MEDIATYPE_Video) || // we only output video

!(pMediaType->IsFixedSize())) // in fixed size samples

{

return E_INVALIDARG;

}


// Check for the subtypes we support

const GUID *SubType = pMediaType->Subtype();

if (SubType == NULL)

return E_INVALIDARG;


if(*SubType != MEDIASUBTYPE_RGB24)

{

return E_INVALIDARG;

}


// Get the format area of the media type

VIDEOINFO *pvi = (VIDEOINFO *) pMediaType->Format();


if(pvi == NULL)

return E_INVALIDARG;


if(pvi->bmiHeader.biBitCount==24)

return NOERROR;

else

return E_INVALIDARG;

}

catch(...)

{

OutputDebugString("n Exception in CheckMediaType() fn...");

return E_INVALIDARG;

}



}






S.No

Tasks To be Done Next


1

Identify the time taken for filter's processing per frame…


2

look at WMINTF


3

Prepare Class diagram and Architecture Diagram for Ur Directshow filters

4

Prepare DFD for ur directshow filters


5

Prepare Documentation


6

Directshow source filter for screen capturing


7

Add File Dialog to Directshow Image File source filter


8

Add histogram and property dialog to the filter


1

Sample application for displaying numbers on the screen

D:samplesSDKBitmapTest

2

Sample application for source filter

SnakeSource filter on Desktop…

3

Directshow source filter

D:samplesSourceFilter



S.No

Puzzle





1

There are 3 glasses. The biggest one can hold 24 ounces. The medium one can hold 11 ounces and the smallest one can hold 5 ounces. Now you have 24 ounces of soft drink in the largest glass. Can you use just these 3 glasses to make the largest glass contain 12 ounces of soft drink by pouring soft drink from one glass to another?












Ans

24ounce

11 ounce

5 ounce


24ounce is filled

24

0

0

Initial State



13

11

0

From 24 ounce, Fill the 11 ounce



18

6

0




18

1

5




23

1

0




23

0

1




12

11

1

Target state


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