HRESULT GetGUIDName(const GUID& guid, WCHAR **ppwsz)
{
HRESULT hr = S_OK;
WCHAR *pName = NULL;
LPCWSTR pcwsz = GetGUIDNameConst(guid);
if (pcwsz)
{
size_t cchLength = 0;
hr = StringCchLength(pcwsz, STRSAFE_MAX_CCH, &cchLength);
if (FAILED(hr))
{
goto done;
}
pName = (WCHAR*)CoTaskMemAlloc((cchLength + 1) * sizeof(WCHAR));
if (pName == NULL)
{
hr = E_OUTOFMEMORY;
goto done;
}
hr = StringCchCopy(pName, cchLength + 1, pcwsz);
if (FAILED(hr))
{
goto done;
}
}
else
{
hr = StringFromCLSID(guid, &pName);
}
done:
if (FAILED(hr))
{
*ppwsz = NULL;
CoTaskMemFree(pName);
}
else
{
*ppwsz = pName;
}
return hr;
}
PCHAR CMediaTypePrinter::ToString()
{
//
//Following are the important ones of Mediatype attributes
//
HRESULT hr = S_OK;
PROPVARIANT var;
LPSTR pTempBaseStr;
MF_ATTRIBUTE_TYPE pType;
GUID attrGuid;
GUID impGuids[] = {
MF_MT_SUBTYPE,
MF_MT_FRAME_SIZE,
MF_MT_SAMPLE_SIZE,
MF_MT_FRAME_RATE,
MF_MT_DEFAULT_STRIDE,
MF_XVP_DISABLE_FRC
};
if (pMediaType && !m_pBuffer)
{
buffLen = MEDIAPRINTER_STARTLEN;
m_pBuffer = new char[buffLen];
m_pBuffer[0] = 0;
for (UINT32 ulIndex = 0; ulIndex < ARRAYSIZE(impGuids); ulIndex++)
{
PropVariantInit(&var);
checkAdjustBufferCap(m_pBuffer, buffLen);
attrGuid = impGuids[ulIndex];
DMFTCHECKHR_GOTO(pMediaType->GetItemType(attrGuid, &pType), done);
DMFTCHECKHR_GOTO(pMediaType->GetItem(attrGuid, &var), done);
if (ulIndex > 0)
strcat_s(m_pBuffer, MEDIAPRINTER_STARTLEN, " : ");
strcat_s(m_pBuffer, buffLen, GetGUIDNameConst(attrGuid));
strcat_s(m_pBuffer, buffLen, "=");
pTempBaseStr = DumpAttribute(pType, var);
strcat_s(m_pBuffer, buffLen, pTempBaseStr);
delete(pTempBaseStr);
PropVariantClear(&var);
}
}
done:
return m_pBuffer;
}
/*++
Description:
Rudimentary function to print the complete Media type
--*/
PCHAR CMediaTypePrinter::ToCompleteString( )
{
HRESULT hr = S_OK;
UINT32 attrCount = 0;
GUID attrGuid = { 0 };
char *tempStore = nullptr;
PROPVARIANT var;
LPSTR pTempBaseStr;
MF_ATTRIBUTE_TYPE pType;
if ( pMediaType && !m_pBuffer )
{
DMFTCHECKHR_GOTO(pMediaType->GetCount(&attrCount), done);
buffLen = MEDIAPRINTER_STARTLEN;
m_pBuffer = new char[buffLen];
m_pBuffer[0] = 0;
for ( UINT32 ulIndex = 0; ulIndex < attrCount; ulIndex++ )
{
PropVariantInit( &var );
checkAdjustBufferCap( m_pBuffer, buffLen );
DMFTCHECKHR_GOTO( pMediaType->GetItemByIndex( ulIndex, &attrGuid, &var ), done );
DMFTCHECKHR_GOTO( pMediaType->GetItemType( attrGuid, &pType ), done );
if ( ulIndex > 0 )
strcat_s(m_pBuffer, MEDIAPRINTER_STARTLEN, " : ");
strcat_s( m_pBuffer, buffLen, GetGUIDNameConst( attrGuid ) );
strcat_s( m_pBuffer, buffLen, "=" );
pTempBaseStr = DumpAttribute( pType, var );
strcat_s( m_pBuffer, buffLen, pTempBaseStr );
delete( pTempBaseStr );
PropVariantClear( &var );
}
done:
if ( tempStore )
{
delete( tempStore );
}
}
return m_pBuffer;
}
