/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
//////////////////////////////////////////////////////////////////////////////
//                                                                          //
//  plWinMicLevel - Annoying class to deal with the annoying problem of     //
//                  setting the microphone recording volume in Windows.     //
//                  Yeah, you'd THINK there'd be some easier way...         //
//                                                                          //
//// Notes ///////////////////////////////////////////////////////////////////
//                                                                          //
//  5.8.2001 - Created by mcn.                                              //
//                                                                          //
//////////////////////////////////////////////////////////////////////////////


#include "HeadSpin.h"
#include "plWinMicLevel.h"


#if HS_BUILD_FOR_WIN32
#include <mmsystem.h>


//// Our Local Static Data ///////////////////////////////////////////////////

int         sNumMixers = 0;
HMIXER      sMixerHandle = nil;
MIXERCAPS   sMixerCaps;

DWORD       sMinValue = 0, sMaxValue = 0;
DWORD       sVolControlID = 0;


//// Local Static Helpers ////////////////////////////////////////////////////

hsBool  IGetMuxMicVolumeControl( void );
hsBool  IGetBaseMicVolumeControl( void );

hsBool  IGetControlValue( DWORD &value );
hsBool  ISetControlValue( DWORD value );

MIXERLINE       *IGetLineByType( DWORD type );
MIXERLINE       *IGetLineByID( DWORD id );
MIXERCONTROL    *IGetControlByType( MIXERLINE *line, DWORD type );
MIXERLINE       *IGetMixerSubLineByType( MIXERCONTROL *mux, DWORD type );
#endif

//// The Publics /////////////////////////////////////////////////////////////

float    plWinMicLevel::GetLevel( void )
{
    if( !CanSetLevel() )
        return -1;

#if HS_BUILD_FOR_WIN32
    DWORD   rawValue;
    if( !IGetControlValue( rawValue ) ) 
        return -1;

    return (float)( rawValue - sMinValue ) / (float)( sMaxValue - sMinValue );
#else
    return -1;
#endif
}

void    plWinMicLevel::SetLevel( float level )
{
    if( !CanSetLevel() )
        return;

#if HS_BUILD_FOR_WIN32
    DWORD   rawValue = (DWORD)(( level * ( sMaxValue - sMinValue ) ) + sMinValue);

    ISetControlValue( rawValue );
#endif
}

hsBool  plWinMicLevel::CanSetLevel( void )
{
    // Just to init
    plWinMicLevel   &instance = IGetInstance();

#if HS_BUILD_FOR_WIN32
    return ( sMixerHandle != nil ) ? true : false;
#else
    return false;
#endif
}


//// Protected Init Stuff ////////////////////////////////////////////////////

plWinMicLevel   &plWinMicLevel::IGetInstance( void )
{
    static plWinMicLevel    sInstance;
    return sInstance;
}

plWinMicLevel::plWinMicLevel()
{
#if HS_BUILD_FOR_WIN32
    sMixerHandle = nil;
    memset( &sMixerCaps, 0, sizeof( sMixerCaps ) );

    // Get the number of mixers in the system
    sNumMixers = ::mixerGetNumDevs();

    // So long as we have one, open the first one
    if( sNumMixers == 0 )
        return;

    if( ::mixerOpen( &sMixerHandle, 0, 
                                    nil,    // Window handle to receive callback messages
                                    nil, MIXER_OBJECTF_MIXER ) != MMSYSERR_NOERROR )
    {
        sMixerHandle = nil; // Just to be sure
        return;
    }

    if( ::mixerGetDevCaps( (UINT)sMixerHandle, &sMixerCaps, sizeof( sMixerCaps ) ) != MMSYSERR_NOERROR )
    {
        // Oh well, who cares
    }

    // Try to get the Mux/mixer-based mic volume control first, since that seems to work better/more often/at all
    if( !IGetMuxMicVolumeControl() )
    {
        // Failed, so try getting the volume control from the base mic-in line
        if( !IGetBaseMicVolumeControl() )
        {
            IShutdown();
            return;
        }
    }
#endif
}

plWinMicLevel::~plWinMicLevel()
{
    IShutdown();
}

void    plWinMicLevel::IShutdown( void )
{
#if HS_BUILD_FOR_WIN32
    if( sMixerHandle != nil )
        ::mixerClose( sMixerHandle );

    sMixerHandle = nil;
#endif
}

#if HS_BUILD_FOR_WIN32
//// IGetMuxMicVolumeControl /////////////////////////////////////////////////
//  Tries to get the volume control of the microphone subline of the MUX or
//  mixer control of the WaveIn destination line of the audio system (whew!)
//  Note: testing indcates that this works but the direct SRC_MICROPHONE
//  doesn't, hence we try this one first.

hsBool  IGetMuxMicVolumeControl( void )
{
    if( sMixerHandle == nil )
        return false;

    // Get the WaveIn destination line
    MIXERLINE *waveInLine = IGetLineByType( MIXERLINE_COMPONENTTYPE_DST_WAVEIN );
    if( waveInLine == nil )
        return false;

    // Get the mixer or MUX controller from the line
    MIXERCONTROL *control = IGetControlByType( waveInLine, MIXERCONTROL_CONTROLTYPE_MIXER );
    if( control == nil )
        control = IGetControlByType( waveInLine, MIXERCONTROL_CONTROLTYPE_MUX );
    if( control == nil )
        return false;

    // Get the microphone sub-component
    // Note: this eventually calls IGetLineByType(), which destroys the waveInLine pointer we had before
    MIXERLINE *micLine = IGetMixerSubLineByType( control, MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE );
    if( micLine == nil )
        return false;

    // Get the volume subcontroller
    MIXERCONTROL *micVolCtrl = IGetControlByType( micLine, MIXERCONTROL_CONTROLTYPE_VOLUME );
    if( micVolCtrl == nil )
        return false;

    // Found it! store our values
    char *dbgLineName = micLine->szName;
    char *dbgControlName = micVolCtrl->szName;
    sMinValue = micVolCtrl->Bounds.dwMinimum;
    sMaxValue = micVolCtrl->Bounds.dwMaximum;
    sVolControlID = micVolCtrl->dwControlID;

    return true;
}

//// IGetBaseMicVolumeControl ////////////////////////////////////////////////
//  Tries to get the volume control of the mic-in line. See 
//  IGetMuxMicVolumeControl for why we don't do this one first.

hsBool  IGetBaseMicVolumeControl( void )
{
    if( sMixerHandle == nil )
        return false;

    // Get the mic source line
    MIXERLINE *micLine = IGetLineByType( MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE );
    if( micLine == nil )
        return false;

    // Get the volume subcontroller
    MIXERCONTROL *micVolCtrl = IGetControlByType( micLine, MIXERCONTROL_CONTROLTYPE_VOLUME );
    if( micVolCtrl == nil )
        return false;

    // Found it! store our values
    char *dbgLineName = micLine->szName;
    char *dbgControlName = micVolCtrl->szName;
    sMinValue = micVolCtrl->Bounds.dwMinimum;
    sMaxValue = micVolCtrl->Bounds.dwMaximum;
    sVolControlID = micVolCtrl->dwControlID;

    return true;
}


//// IGetControlValue ////////////////////////////////////////////////////////
//  Gets the raw value of the current volume control.

hsBool  IGetControlValue( DWORD &value )
{
    if( sMixerHandle == nil )
        return false;

    MIXERCONTROLDETAILS_UNSIGNED mxcdVolume;
    MIXERCONTROLDETAILS mxcd;
    mxcd.cbStruct = sizeof( MIXERCONTROLDETAILS );
    mxcd.dwControlID = sVolControlID;
    mxcd.cChannels = 1;
    mxcd.cMultipleItems = 0;
    mxcd.cbDetails = sizeof( MIXERCONTROLDETAILS_UNSIGNED );
    mxcd.paDetails = &mxcdVolume;
    
    if( ::mixerGetControlDetails( (HMIXEROBJ)sMixerHandle, &mxcd, 
            MIXER_OBJECTF_HMIXER | MIXER_GETCONTROLDETAILSF_VALUE ) != MMSYSERR_NOERROR )
        return false;
    
    value = mxcdVolume.dwValue;
    return true;
}

//// ISetControlValue ////////////////////////////////////////////////////////
//  Sets the raw value of the current volume control.

hsBool  ISetControlValue( DWORD value )
{
    if( sMixerHandle == nil )
        return false;

    MIXERCONTROLDETAILS_UNSIGNED mxcdVolume = { value };
    MIXERCONTROLDETAILS mxcd;
    mxcd.cbStruct = sizeof( MIXERCONTROLDETAILS );
    mxcd.dwControlID = sVolControlID;
    mxcd.cChannels = 1;
    mxcd.cMultipleItems = 0;
    mxcd.cbDetails = sizeof( MIXERCONTROLDETAILS_UNSIGNED );
    mxcd.paDetails = &mxcdVolume;

    if( ::mixerSetControlDetails( (HMIXEROBJ)sMixerHandle, &mxcd, 
            MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE ) != MMSYSERR_NOERROR )
        return false;
    
    return true;
}


//// Helper Functions ////////////////////////////////////////////////////////

MIXERLINE *IGetLineByType( DWORD type )
{
    static MIXERLINE mxl;

    mxl.cbStruct = sizeof( MIXERLINE );
    mxl.dwComponentType = type;
    if( ::mixerGetLineInfo( (HMIXEROBJ)sMixerHandle, &mxl, MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE ) != MMSYSERR_NOERROR )
        return nil;

    return &mxl;
}

MIXERLINE *IGetLineByID( DWORD id )
{
    static MIXERLINE mxl;

    mxl.cbStruct = sizeof( MIXERLINE );
    mxl.dwLineID = id;
    if( ::mixerGetLineInfo( (HMIXEROBJ)sMixerHandle, &mxl, MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_LINEID ) != MMSYSERR_NOERROR )
        return nil;

    return &mxl;
}

MIXERCONTROL    *IGetControlByType( MIXERLINE *line, DWORD type )
{
    static MIXERCONTROL mxc;

    MIXERLINECONTROLS mxlc;
    mxlc.cbStruct = sizeof( MIXERLINECONTROLS );
    mxlc.dwLineID = line->dwLineID;
    mxlc.dwControlType = type;
    mxlc.cControls = 1;
    mxlc.cbmxctrl = sizeof( MIXERCONTROL );
    mxlc.pamxctrl = &mxc;
    if( ::mixerGetLineControls( (HMIXEROBJ)sMixerHandle, &mxlc, MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE ) != MMSYSERR_NOERROR )
        return nil;

    return &mxc;
}

MIXERLINE   *IGetMixerSubLineByType( MIXERCONTROL *mux, DWORD type )
{
    // A mixer or MUX is really a combination of MORE lines. And beautifully, you can't
    // just ask for a single one off of it, you have to ask for them all and search through yourself
    MIXERCONTROLDETAILS_LISTTEXT *lineInfo = new MIXERCONTROLDETAILS_LISTTEXT[ mux->cMultipleItems ];
    if( lineInfo == nil )
        return nil;

    MIXERCONTROLDETAILS details;
    details.cbStruct = sizeof( MIXERCONTROLDETAILS );
    details.dwControlID = mux->dwControlID;
    details.cChannels = 1;
    details.cMultipleItems = mux->cMultipleItems;
    details.cbDetails = sizeof( MIXERCONTROLDETAILS_LISTTEXT );
    details.paDetails = lineInfo;
    if( ::mixerGetControlDetails( (HMIXEROBJ)sMixerHandle, &details, MIXER_OBJECTF_HMIXER | MIXER_GETCONTROLDETAILSF_LISTTEXT ) != MMSYSERR_NOERROR )
    {
        delete [] lineInfo;
        return nil;
    }

    // Loop through and find the one with the right component type. But of course it doesn't give us that offhand...
    for( unsigned int i = 0; i < mux->cMultipleItems; i++ )
    {
        MIXERLINE *line = IGetLineByID( lineInfo[ i ].dwParam1 );
        if( line->dwComponentType == type )
        {
            delete [] lineInfo;
            return line;
        }
    }

    delete [] lineInfo;
    return nil;
}

#endif
