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/**************************************************************************
A/V Stream Camera Sample
Copyright (c) 2014, Microsoft Corporation.
File:
ExtendedMetadata.h
Abstract:
This file contains the helper class CExtendedMetadata.
The class is provides initialization and accessor functions for
KSCAMERA_EXTENDEDPROP_METADATAINFO.
History:
created 6/20/2014
**************************************************************************/
//
// Helper class for Extended Metadata.
//
class CExtendedMetadata
: public CExtendedHeader
{
public:
KSCAMERA_EXTENDEDPROP_METADATAINFO m_Info;
// Maximum metadata required ... except for Histogram
static const ULONG METADATA_MAX=4096;
// Standardized ctors to help ensure a consistant definition.
CExtendedMetadata(
_In_ ULONG pinId=0, // Just so we have a default ctor.
_In_ ULONG size=METADATA_MAX,
_In_ ULONG align=KSCAMERA_EXTENDEDPROP_MetadataAlignment_32,
_In_ ULONGLONG flags=(KSCAMERA_EXTENDEDPROP_METADATA_ALIGNMENTREQUIRED | KSCAMERA_EXTENDEDPROP_METADATA_SYSTEMMEMORY),
_In_ ULONG result=STATUS_SUCCESS
)
: CExtendedHeader( flags, result )
{
PinId = pinId;
Size = sizeof(*this);
m_Info.BufferAlignment = align;
m_Info.MaxMetadataBufferSize= size;
}
// Used to modify the metadata allocation size.
CExtendedMetadata &
operator =( ULONG x )
{
m_Info.MaxMetadataBufferSize = x;
return *this;
}
bool isValid()
{
return CExtendedHeader::isValid() &&
(Size == sizeof(*this)) &&
((Flags & ~(KSCAMERA_EXTENDEDPROP_METADATA_SYSTEMMEMORY | KSCAMERA_EXTENDEDPROP_METADATA_ALIGNMENTREQUIRED)) == 0) && // Only valid flags
((m_Info.BufferAlignment-1) & m_Info.BufferAlignment); // Not more than 1 bit set.
}
};
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