hw.cpp

winddk src目录下的WDM源码压缩!

/*++

Copyright (c) 1997-2000  Microsoft Corporation All Rights Reserved

Module Name:

    hw.cpp

Abstract:

    Implementation of MSVAD HW class. 
    MSVAD HW has an array for storing mixer and volume settings
    for the topology.


--*/
#include <msvad.h>
#include "hw.h"

//=============================================================================
// CMSVADHW
//=============================================================================

//=============================================================================
#pragma code_seg("PAGE")
CMSVADHW::CMSVADHW()
: m_ulMux(0)
/*++

Routine Description:

    Constructor for MSVADHW. 

Arguments:

Return Value:

    void

--*/
{
    PAGED_CODE();
    
    MixerReset();
} // CMSVADHW
#pragma code_seg()

//=============================================================================
BOOL
CMSVADHW::GetMixerMute
(
    IN  ULONG                   ulNode
)
/*++

Routine Description:

  Gets the HW (!) mute levels for MSVAD

Arguments:

  ulNode - topology node id

Return Value:

  mute setting

--*/
{
    if (ulNode < MAX_TOPOLOGY_NODES)
    {
        return m_MuteControls[ulNode];
    }

    return 0;
} // GetMixerMute

//=============================================================================
ULONG                       
CMSVADHW::GetMixerMux()
/*++

Routine Description:

  Return the current mux selection

Arguments:

Return Value:

  ULONG

--*/
{
    return m_ulMux;
} // GetMixerMux

//=============================================================================
LONG
CMSVADHW::GetMixerVolume
(   
    IN  ULONG                   ulNode,
    IN  LONG                    lChannel
)
/*++

Routine Description:

  Gets the HW (!) volume for MSVAD.

Arguments:

  ulNode - topology node id

  lChannel - which channel are we setting?

Return Value:

  LONG - volume level

--*/
{
    if (ulNode < MAX_TOPOLOGY_NODES)
    {
        return m_VolumeControls[ulNode];
    }

    return 0;
} // GetMixerVolume

//=============================================================================
#pragma code_seg("PAGE")
void 
CMSVADHW::MixerReset()
/*++

Routine Description:

  Resets the mixer registers.

Arguments:

Return Value:

    void

--*/
{
    PAGED_CODE();
    
    RtlFillMemory(m_VolumeControls, sizeof(LONG) * MAX_TOPOLOGY_NODES, 0xFF);
    RtlFillMemory(m_MuteControls, sizeof(BOOL) * MAX_TOPOLOGY_NODES, TRUE);
    
    // BUGBUG change this depending on the topology
    m_ulMux = 2;
} // MixerReset
#pragma code_seg()

//=============================================================================
void
CMSVADHW::SetMixerMute
(
    IN  ULONG                   ulNode,
    IN  BOOL                    fMute
)
/*++

Routine Description:

  Sets the HW (!) mute levels for MSVAD

Arguments:

  ulNode - topology node id

  fMute - mute flag

Return Value:

    void

--*/
{
    if (ulNode < MAX_TOPOLOGY_NODES)
    {
        m_MuteControls[ulNode] = fMute;
    }
} // SetMixerMute

//=============================================================================
void                        
CMSVADHW::SetMixerMux
(
    IN  ULONG                   ulNode
)
/*++

Routine Description:

  Sets the HW (!) mux selection

Arguments:

  ulNode - topology node id

Return Value:

    void

--*/
{
    m_ulMux = ulNode;
} // SetMixMux

//=============================================================================
void  
CMSVADHW::SetMixerVolume
(   
    IN  ULONG                   ulNode,
    IN  LONG                    lChannel,
    IN  LONG                    lVolume
)
/*++

Routine Description:

  Sets the HW (!) volume for MSVAD.

Arguments:

  ulNode - topology node id

  lChannel - which channel are we setting?

  lVolume - volume level

Return Value:

    void

--*/
{
    if (ulNode < MAX_TOPOLOGY_NODES)
    {
        m_VolumeControls[ulNode] = lVolume;
    }
} // SetMixerVolume