CMiniportWaveCyclicStream Class Reference

#include <wavecyclicstream.h>

Inheritance diagram for CMiniportWaveCyclicStream:

Collaboration diagram for CMiniportWaveCyclicStream:

Public Member Functions
	DECLARE_STD_UNKNOWN ()
	DEFINE_STD_CONSTRUCTOR (CMiniportWaveCyclicStream)
	~CMiniportWaveCyclicStream ()
NTSTATUS	Init_ ()
void	InterruptServiceRoutine ()
Public Member Functions inherited from CMiniportStream
	~CMiniportStream ()
void	ResetDMA (void)
void	PauseDMA (void)
void	ResumeDMA (ULONG state=DMA_ENGINE_ON)
int	GetBuffPos (DWORD *buffPos)
void	WriteReg8 (ULONG addr, UCHAR data)
void	WriteReg16 (ULONG addr, USHORT data)
void	WriteReg32 (ULONG addr, ULONG data)
UCHAR	ReadReg8 (ULONG addr)
USHORT	ReadReg16 (ULONG addr)
ULONG	ReadReg32 (ULONG addr)
	STDMETHODIMP_ (NTSTATUS) SetFormat(_In_ PKSDATAFORMAT Format)
void	PowerChangeNotify (IN POWER_STATE NewState)
virtual void	PowerChangeNotify_ (IN POWER_STATE NewState)
ULONG	GetCurrentSampleRate (void)
NTSTATUS	Init (IN CMiniport *Miniport_, IN PUNKNOWN PortStream, IN WavePins Pin_, IN BOOLEAN Capture_, IN PKSDATAFORMAT DataFormat_, OUT PSERVICEGROUP *ServiceGroup_)
virtual void	InterruptServiceRoutine () PURE
virtual NTSTATUS	Init_ () PURE
NTSTATUS	NonDelegatingQueryInterface (_In_ REFIID Interface, _COM_Outptr_ PVOID *Object, _In_ REFIID iStream, _In_ PUNKNOWN stream)
NTSTATUS	SetState (_In_ KSSTATE State)
NTSTATUS	NormalizePhysicalPosition (_Inout_ PLONGLONG PhysicalPosition)
PVOID	BDList_Alloc ()
void	BDList_Free ()
void	UpdateLviCyclic ()

Public Attributes
	IMP_IMiniportWaveCyclicStream
Public Attributes inherited from CUnknown
union {
IUnknown   IUnknown
INonDelegatingUnknown   INonDelegatingUnknown
};
LONG	m_ref_count
PUNKNOWN	m_outer_unknown
Public Attributes inherited from CMiniportStream
CMiniport *	Miniport
WavePins	Pin
BOOL	Capture
WORD	NumberOfChannels
DEVICE_POWER_STATE	m_PowerState
PPORTSTREAM_	PortStream
PKSDATAFORMAT_WAVEFORMATEX	DataFormat
PSERVICEGROUP	ServiceGroup
ULONG	CurrentRate
ULONG	DMAEngineState
ULONG	m_ulBDAddr
PHYSICAL_ADDRESS	BDList_PhysAddr
tBDEntry *	BDList
	IMP_IDrmAudioStream

Private Member Functions
CMiniportWaveCyclic *	Wave ()
NTSTATUS	ResizeBuffer (void)

Private Attributes
DWORD	m_bufferSize

Detailed Description

Definition at line 61 of file wavecyclicstream.h.

Constructor & Destructor Documentation

~CMiniportWaveCyclicStream()

CMiniportWaveCyclicStream::~CMiniportWaveCyclicStream

(

)

Definition at line 74 of file wavecyclicstream.cpp.

{
    PAGED_CODE ();
 
 
    DOUT (DBG_PRINT, ("[CMiniportWaveCyclicStream::~CMiniportWaveCyclicStream]"));
 
    // Release the scatter/gather table.
    BDList_Free();
}

Member Function Documentation

DECLARE_STD_UNKNOWN()

CMiniportWaveCyclicStream::DECLARE_STD_UNKNOWN

(

)

DEFINE_STD_CONSTRUCTOR()

CMiniportWaveCyclicStream::DEFINE_STD_CONSTRUCTOR

(

CMiniportWaveCyclicStream

)

Init_()

NTSTATUS CMiniportWaveCyclicStream::Init_ ( )

virtual

Reimplemented from CMiniportStream.

Definition at line 92 of file wavecyclicstream.cpp.

{
    PAGED_CODE ();
 
    DOUT (DBG_PRINT, ("[CMiniportWaveCyclicStream::Init]"));
 
    //
    // Setup the Buffer Descriptor List (BDL)
    // Allocate 32 entries of 8 bytes (one BDL entry).
    // The pointer is aligned on a 8 byte boundary (that's what we need).
    //
 
    if (!BDList_Alloc())
    {
        DOUT (DBG_ERROR, ("Failed AllocateCommonBuffer!"));
        return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    return ResizeBuffer();
}

InterruptServiceRoutine()

void CMiniportWaveCyclicStream::InterruptServiceRoutine ( )

virtual

Reimplemented from CMiniportStream.

Definition at line 219 of file wavecyclicstream.cpp.

{
    //
    // Update the LVI so that we cycle around in the scatter gather list.
    //
    UpdateLviCyclic();
 
    //
    // Request DPC service for PCM out.
    //
    Miniport->Port->Notify (ServiceGroup);
}

ResizeBuffer()

NTSTATUS CMiniportWaveCyclicStream::ResizeBuffer ( void  )

private

Definition at line 124 of file wavecyclicstream.cpp.

{
    // calculate buffer size
    DWORD nSamples = DataFormat->WaveFormatEx.nSamplesPerSec * BUFFERTIME / 1000;
    DWORD bufferSize = DataFormat->WaveFormatEx.nBlockAlign * nSamples;
    DWORD totalSize = bufferSize * NBUFFERS;
 
    // allocate buffer
    PDMACHANNEL DmaChannel = Miniport->DmaChannel;
    DWORD allocSize = DmaChannel->AllocatedBufferSize();
    if(totalSize > allocSize)
    {
        DmaChannel->FreeBuffer();
        NTSTATUS ntStatus = DmaChannel->AllocateBuffer(totalSize, 0);
        if (!NT_SUCCESS (ntStatus)) {
            m_bufferSize = 0;
            return ntStatus;
        }
    }
 
    DmaChannel->SetBufferSize(totalSize);
 
    // initialize bdList
    DWORD addr = DmaChannel->PhysicalAddress().LowPart;
    for (UINT loop = 0; loop < MAX_BDL_ENTRIES; loop++)
    {
        BDList[loop].dwPtrToPhyAddress = addr + bufferSize * (loop % NBUFFERS);
        BDList[loop].wLength = (WORD)bufferSize/2;
        BDList[loop].wPolicyBits = BUP_SET | IOC_ENABLE;
    }
 
    // update buffer size
    m_bufferSize = bufferSize;
    return STATUS_SUCCESS;
}

Referenced by Init_(), and STDMETHODIMP_().

Wave()

CMiniportWaveCyclic * CMiniportWaveCyclicStream::Wave ( )

inlineprivate

Definition at line 76 of file wavecyclicstream.h.

                                {
      return (CMiniportWaveCyclic*)Miniport; }

Member Data Documentation

IMP_IMiniportWaveCyclicStream

CMiniportWaveCyclicStream::IMP_IMiniportWaveCyclicStream

Definition at line 100 of file wavecyclicstream.h.

m_bufferSize

DWORD CMiniportWaveCyclicStream::m_bufferSize

private

Definition at line 66 of file wavecyclicstream.h.

Referenced by ResizeBuffer(), and STDMETHODIMP_().

---

The documentation for this class was generated from the following files:

• drivers/wdm/audio/drivers/ac97/wavecyclicstream.h
• drivers/wdm/audio/drivers/ac97/wavecyclicstream.cpp