/*
* Descent 3 
* Copyright (C) 2024 Parallax Software
*
* 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/>.

--- HISTORICAL COMMENTS FOLLOW ---

 * $Logfile: /DescentIII/Main/D3Launch/AudioTab.cpp $
 * $Revision: 1.1.1.1 $
 * $Date: 2003-08-26 03:56:51 $
 * $Author: kevinb $
 *
 * 
 *
 * $Log: not supported by cvs2svn $
 * 
 * 39    9/29/99 10:39a Nate
 * Aureal OEM now allows other mixers
 * 
 * 38    8/19/99 6:13p Samir
 * detect vortex1 chipsets.
 * 
 * 37    6/09/99 2:46p Nate
 * Minor changes for different builds
 * 
 * 35    5/20/99 1:08p Samir
 * fixed EAX check.
 * 
 * 34    5/20/99 12:53p Nate
 * Added GLSetup window, EAX mixer support, and CHFlight+Mouseman Mode
 * options
 * 
 * 33    4/27/99 10:41p Nate
 * Added 16bit dsound support
 * 
 * 32    3/29/99 4:34p Samir
 * better checking of results from Aureal initialization.
 * 
 * 31    3/29/99 4:25p Nate
 * changed aureal check.
 * 
 * 30    3/29/99 4:08p Samir
 * check for Aureal 2.0 reflections to see if hardware is supported.
 * 
 * 29    3/29/99 3:52p Samir
 * Check for occlusions feature in Aureal after initialized.
 * 
 * 28    3/29/99 3:21p Samir
 * added aureal 2.0 check.
 * 
 * 27    3/29/99 3:14p Nate
 * Added OEM_GENERIC
 * 
 * 26    3/04/99 12:07p Nate
 * Made Software the default mixer (if it's available)
 * 
 * 25    2/28/99 5:31p Nate
 * Disabled DS3D and Aureal mixers for the Voodoo3 OEM
 * 
 * 24    2/05/99 3:51p Nate
 * Added conditional compilation directives for OEM support
 * 
 * 23    10/23/98 6:48p Nate
 * more fixes.
 * 
 * 22    10/23/98 5:29p Nate
 * Small fixes.
 * 
 * 21    10/21/98 4:51p Nate
 * More fixes.
 * 
 * 20    10/18/98 2:43p Nate
 * Dimmed D3D and Aureal Mixer options for the demo
 * 
 * 19    10/15/98 10:54a Nate
 * Added Launcher Sound toggling
 * 
 * 18    10/14/98 5:52p Nate
 * More fixes
 * 
 * 17    10/14/98 11:37a Nate
 * Added default to DS8 for Chris
 * 
 * 16    10/13/98 3:03p Nate
 * More fixes and changes.
 * 
 * 15    10/12/98 8:16p Nate
 * Commented out "old Aureal DLL" messages for now
 * 
 * 14    10/12/98 7:13p Nate
 * Fixed several bugs.
 * 
 * 13    10/10/98 4:05p Nate
 * Added detection/scanning window messages
 * 
 * 12    10/10/98 2:33p Nate
 * More fixes.
 * 
 * 11    10/08/98 6:23p Nate
 * Fixed a few bugs.
 * 
 * 10    9/25/98 6:57p Nate
 * If no card is in registry, the list box now defaults to none.
 * 
 * 9     9/22/98 3:33p Nate
 * Added conditional compiling to help system (can toggle between HTML and
 * standard windows help)
 * 
 * 8     9/21/98 5:40p Nate
 * Incorporated the new HTML help system
 * 
 * 7     9/21/98 12:12p Nate
 * Changed "Soundcard" registry value name to "SoundcardName"
 * 
 * 6     9/01/98 7:15p Nate
 * Major Revision #2
 * 
 * 5     8/31/98 6:44p Nate
 * Major Revision
 * 
 * 4     8/10/98 10:44a Nate
 * Added Language selection support
 * 
 * 3     8/05/98 4:52p Nate
 * Added registry reading and writing.
 * 
 * 2     8/05/98 11:54a Nate
 * Initial Version
 *
 * $NoKeywords: $
 */

// AudioTab.cpp : implementation file
//

#include "stdafx.h"
#include "afxpriv.h"
#include "afxext.h"
#include "D3Launch.h"
#include "D3LaunchDlg.h"
#include "AudioTab.h"

#include <windows.h>
#include <mmsystem.h>
#include <dsound.h>
#include <objbase.h>
#include <initguid.h>

#include "ia3dapi.h"
#include "ia3dutil.h"
#include "eax.h"

#include "OS_Config.h"


#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#define MAX_CARDS 32

#define SBT_PRIMARY	0

// Supported sound mixers (for saving to registry)
#define SOUND_MIXER_SOFTWARE_16	0
#define SOUND_MIXER_DS_16			1
#define SOUND_MIXER_DS_8			2
#define SOUND_MIXER_DS3D_16		3
#define SOUND_MIXER_AUREAL_16		4
#define SOUND_MIXER_NONE			5
#define SOUND_MIXER_EAX				6

// Setup available mixer flags
#define SOFTWARE_MIXER	0x01
#define DS8BIT_MIXER		0x02
#define DS16BIT_MIXER	0x04
#define DS3D_MIXER		0x08
#define AUREAL_MIXER		0x10	// Unused
#define EAX_MIXER			0x20

typedef struct {
	GUID	guid;
	LPGUID	pguid;

	char name[1024];	// Name of the device
	UINT mixers;		// Mixers supported by device
} SoundCard;

static SoundCard Cards[MAX_CARDS];
static int Num_cards;

// the callback for the DirectSound enumeration process
BOOL WINAPI dsound_enum_callback
( 
	GUID FAR * lpGuid,
	LPSTR lpDeviceDescription,
	LPSTR lpDeviceName,
	LPVOID lpContext
)
{
	SoundCard *card=&Cards[Num_cards++];

	if ( lpGuid )	{
		memmove( &card->guid, lpGuid, sizeof(GUID) );
		card->pguid = &card->guid;
	} else {
		memset( &card->guid, 0, sizeof(GUID) );
		card->pguid = NULL;
	}

	// Save name of device
	sprintf(card->name, "%s", lpDeviceDescription);

	return TRUE;
}


// Creates a  Primary direct sound buffer
HRESULT 
CreateDSBuffer
(
	LPDIRECTSOUND lpDirectSound,
	int buffer_type, 
	LPDIRECTSOUNDBUFFER *lp_lp_dsb, 
	DWORD sound_bytes, 
	DWORD frequency, 
	bool f_is_stereo, 
	bool f_is_16_bit,
	bool positional
) 
{
	DSBUFFERDESC dsbd;
	tWAVEFORMATEX fmt;
	HRESULT result;
	
	if(frequency != 44100 && frequency != 22050 && frequency != 11025)
		return 0;

	if(lpDirectSound==NULL)
		return 0;

	// Setup the wave format
	fmt.nChannels = (f_is_stereo)?2:1;
	fmt.wBitsPerSample = (f_is_16_bit)?16:8;
	fmt.nSamplesPerSec = ((DWORD)frequency);
	fmt.nBlockAlign = fmt.nChannels*(fmt.wBitsPerSample>>3);
	fmt.nAvgBytesPerSec = ((DWORD)fmt.nSamplesPerSec)*((DWORD)fmt.nBlockAlign);
	fmt.wFormatTag = WAVE_FORMAT_PCM;

	// Setup the secondary direct sound buffer
	memset(&dsbd, 0, sizeof(dsbd));
	dsbd.lpwfxFormat = (LPWAVEFORMATEX)&fmt;
	dsbd.dwSize = sizeof(DSBUFFERDESC);
	dsbd.dwBufferBytes = sound_bytes;

	// Setup for Software 16 bit mixer
	dsbd.dwFlags = DSBCAPS_GETCURRENTPOSITION2;

	if(buffer_type != SBT_PRIMARY) return 0;
		
	//m_primary_frequency = m_current_frequency = frequency;	
	//m_primary_bit_depth = fmt.wBitsPerSample;	
	//m_primary_alignment   = fmt.nBlockAlign;

	dsbd.lpwfxFormat = NULL;
	dsbd.dwBufferBytes = 0;
	dsbd.dwFlags = DSBCAPS_PRIMARYBUFFER | DSBCAPS_GETCURRENTPOSITION2;
	if (positional) {
		dsbd.dwFlags |= DSBCAPS_CTRL3D;
	}

	// Create the buffer
	result = lpDirectSound->CreateSoundBuffer(&dsbd, lp_lp_dsb, 0);

	if (result == DS_OK && buffer_type == SBT_PRIMARY) 
	{ 
		// Succeeded. Set primary buffer to desired format. 
		result = (*lp_lp_dsb)->SetFormat(&fmt); 
	}

	return result;
}

BOOL CreativeEAXCheck(LPDIRECTSOUND lpds)
{
	BOOL retval=FALSE;
	DWORD properties=0;
	ULONG ulAnswer=0;
	LPKSPROPERTYSET	lpksps = NULL;
	WAVEFORMATEX wave;
	DSBUFFERDESC dsbdesc;
	LPDIRECTSOUNDBUFFER lpdsb=NULL;

	const DWORD EAX_ENVIRONMENTS_AVAILABLE = 1,
				EAX_BUFFERMIX_AVAILABLE =2;

	memset(&wave, 0, sizeof(WAVEFORMATEX)); 
	wave.wFormatTag = WAVE_FORMAT_PCM;
	wave.nChannels = 1; 
	wave.nSamplesPerSec = 11025; 
	wave.wBitsPerSample = 8; 
	wave.nBlockAlign = wave.wBitsPerSample / 8 * wave.nChannels;
	wave.nAvgBytesPerSec = wave.nSamplesPerSec * wave.nBlockAlign;

	memset(&dsbdesc, 0, sizeof(DSBUFFERDESC)); 
	dsbdesc.dwSize = sizeof(DSBUFFERDESC); 
	dsbdesc.dwFlags = DSBCAPS_STATIC|DSBCAPS_CTRL3D; 
	dsbdesc.dwBufferBytes = DSBSIZE_MIN*2;  
	dsbdesc.lpwfxFormat = &wave; 

	if ( FAILED(lpds->CreateSoundBuffer(&dsbdesc, &lpdsb, NULL)) ) {
		retval = FALSE;
	}
	else if ( FAILED(lpdsb->QueryInterface(IID_IKsPropertySet, (LPVOID *)&lpksps)) ) {
		retval = FALSE;
	}
	else if (FAILED(lpksps->QuerySupport(DSPROPSETID_EAX_ReverbProperties, DSPROPERTY_EAX_ALL, &ulAnswer)) )	 {
		retval = FALSE;
	}
	else {
		if ( (ulAnswer & KSPROPERTY_SUPPORT_SET|KSPROPERTY_SUPPORT_GET) == (KSPROPERTY_SUPPORT_SET|KSPROPERTY_SUPPORT_GET) ) {
			properties |= EAX_ENVIRONMENTS_AVAILABLE;
			if (FAILED(lpksps->QuerySupport(DSPROPSETID_EAXBUFFER_ReverbProperties, DSPROPERTY_EAXBUFFER_REVERBMIX, &ulAnswer)) ) {
				retval = FALSE;
			}
			else {
				properties |= EAX_BUFFERMIX_AVAILABLE;
			}
		}
		else {
			retval = FALSE;
		}
	}

	if (lpksps) {
		lpksps->Release();
	}
	if (lpdsb) {
		lpdsb->Release();
	}

	if (properties & (EAX_BUFFERMIX_AVAILABLE+EAX_ENVIRONMENTS_AVAILABLE)) {
		retval = TRUE;
	}

	return retval;
}

   

// Checks capabilities of given directsound device to see which mixers
// it can handle
bool DetermineMixerOptions(LPDIRECTSOUND lpDirectSound, UINT &mixer_flags)
{
    DSCAPS dscaps;
    HRESULT hr;

	// Default to just having DirectSound 8 bit available
	mixer_flags=DS8BIT_MIXER;

    dscaps.dwSize = sizeof(DSCAPS);
    hr = lpDirectSound->GetCaps(&dscaps);
    if(hr != DS_OK) {
		return FALSE;
    }

/* We have decided to remove Direct Sound mixers as an option
	// Check DirectSound 8 Bit support
	if(dscaps.dwFlags & DSCAPS_PRIMARY8BIT)
		mixer_flags |= DS8BIT_MIXER;
	else
		mixer_flags &= ~DS8BIT_MIXER;
*/
	// Check DirectSound 16 Bit support
	if(dscaps.dwFlags & DSCAPS_PRIMARY16BIT)
		mixer_flags |= DS16BIT_MIXER;
	else
		mixer_flags &= ~DS16BIT_MIXER;

#if (!defined(DEMO) && !defined(OEM_VOODOO3))
	// Check DirectSound 3D Bit support
	if(dscaps.dwMaxHw3DAllBuffers>0)
		mixer_flags |= DS3D_MIXER;
	else
		mixer_flags &= ~DS3D_MIXER;
#endif

	// Check for Software and Creative EAX support
	//////////////////////////////////////////////
	if(dscaps.dwFlags & DSCAPS_EMULDRIVER) 
		return TRUE; // In NT or bad sound card, so don't set software flag

	//Set the Cooperative level AND make sure it is ok to do it
	HRESULT scl_status;
	scl_status = lpDirectSound->SetCooperativeLevel(pLaunchDlg->m_hWnd, DSSCL_WRITEPRIMARY);
	if(scl_status != DS_OK)
		return TRUE; // don't set software flag

	// EAX support
	if (CreativeEAXCheck(lpDirectSound)) {
		mixer_flags |= EAX_MIXER;
	}

	// Try and create a buffer
	HRESULT result;
	LPDIRECTSOUNDBUFFER lp_primary_buffer;
	lp_primary_buffer=NULL;

	// test software
	result=CreateDSBuffer(lpDirectSound, SBT_PRIMARY, &lp_primary_buffer, 0, 22050, true, true, false);

	// Make sure buffer was created successfully
	if(lp_primary_buffer == NULL)
		return TRUE;

	if(result!=DS_OK) {
		lp_primary_buffer->Release();
		return TRUE;
	}

	// Determine if we are running NT or have a bad Win95 sound card
	{
		DSBCAPS dsbcaps;
		dsbcaps.dwSize = sizeof(DSBCAPS);
		lp_primary_buffer->GetCaps(&dsbcaps);
			
		// Is you want to see the caps, here is where -- mprintf all you want
		if(!(dsbcaps.dwFlags & DSBCAPS_LOCHARDWARE))
		{
			lp_primary_buffer->Release();
			return TRUE;
		}
	}

	// Release the buffer
	lp_primary_buffer->Release();

	// Device passed all four software tests, so set the flag
	mixer_flags |= SOFTWARE_MIXER;

	return TRUE;
} 

typedef BOOL (CALLBACK *LPFN_DIRECTSOUNDENUMERATE)(LPDSENUMCALLBACKA lpDSEnumCallback, LPVOID lpContext);
typedef HRESULT (CALLBACK *LPFN_DIRECTSOUNDCREATE)(GUID FAR * lpGuid,LPDIRECTSOUND * ppDS,IUnknown FAR * pUnkOuter);

// Adds any Direct Sound devices to the list of available sound settings
void check_direct_sound()
{
	int j;
	HINSTANCE ds_dll_handle;
	HRESULT dsrval;
	LPFN_DIRECTSOUNDENUMERATE pfn_DirectSoundEnumerate;
	LPFN_DIRECTSOUNDCREATE pfn_DirectSoundCreate;
	LPDIRECTSOUND lpDirectSound;

	ds_dll_handle = LoadLibrary("dsound.dll");
	if (ds_dll_handle==NULL)
		return;

	// Get function pointers from DLL
	pfn_DirectSoundEnumerate = (LPFN_DIRECTSOUNDENUMERATE) GetProcAddress(ds_dll_handle, "DirectSoundEnumerateA");
	if (pfn_DirectSoundEnumerate==NULL) {
		OutputDebugString( "Could not find DirectSoundEnumerate()\n" );
		goto DSoundCleanup;
	}

	pfn_DirectSoundCreate = (LPFN_DIRECTSOUNDCREATE) GetProcAddress(ds_dll_handle, "DirectSoundCreate");
	if (pfn_DirectSoundCreate==NULL) {
		OutputDebugString( "Could not find DirectSoundCreate()\n" );
		goto DSoundCleanup;
	}

	// Enumerate sound cards/devices on user's system
	dsrval = pfn_DirectSoundEnumerate((LPDSENUMCALLBACKA)dsound_enum_callback, NULL );
	if ( dsrval != DS_OK ) {
		OutputDebugString( "DirectSoundEnumerate failed.\n" );
		goto DSoundCleanup;
	}

	// Evaluate mixer capabilities for each device
	for(j=1; j<Num_cards; j++) {

		// No matter what, allow default mixer to be selected
		Cards[j].mixers=DS8BIT_MIXER;

		// Initialize Direct sound and get available mixers
		if(DirectSoundCreate(Cards[j].pguid, &lpDirectSound, NULL) == DS_OK) {
			// Creation succeeded.
			//lpDirectSound->lpVtbl->SetCooperativeLevel(lpDirectSound, hwnd, DSSCL_NORMAL);
			// .
			// . Place code to access DirectSound object here.
			// .
			DetermineMixerOptions(lpDirectSound,Cards[j].mixers);
			lpDirectSound->Release();
		} 
		else {
			OutputDebugString( "DirectSoundCreate failed.\n" );
			//goto DSoundCleanup;
		}

#if (!defined(DEMO) && !defined(OEM_VOODOO3))
		// Try to initialize Aureal 3D sound
		{
			Cards[j].mixers &= ~AUREAL_MIXER;
		}
#endif
	}

DSoundCleanup:
	FreeLibrary(ds_dll_handle);
	return;
}

/////////////////////////////////////////////////////////////////////////////
// CAudioTab property page

IMPLEMENT_DYNCREATE(CAudioTab, CPropertyPage)

CAudioTab::CAudioTab() : CPropertyPage(CAudioTab::IDD)
{
	//{{AFX_DATA_INIT(CAudioTab)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
}

CAudioTab::~CAudioTab()
{
}

// Fills in Cards and Num_cards
void detect_sound_cards(int really_detect)
{ 
	Num_cards = 0;

	CString no_sound_msg;
	no_sound_msg.LoadString(IDS_AUDIOTAB_NO_SOUND);

	// Setup "None" card slot
	strcpy(Cards[Num_cards].name, no_sound_msg);
	Cards[Num_cards].mixers=0;
	Cards[Num_cards].pguid=NULL;
	memset( &Cards[Num_cards].guid, 0, sizeof(GUID) );
	Num_cards++;	

	if (really_detect) {
		check_direct_sound();
	}
}

void CAudioTab::DoDataExchange(CDataExchange* pDX)
{
	CPropertyPage::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAudioTab)
	DDX_Control(pDX, IDC_LAUNCHER_SND_CHECK, m_LauncherSndCheck);
	DDX_Control(pDX, IDC_AUDIO_LIST, m_audio_list);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CAudioTab, CPropertyPage)
	//{{AFX_MSG_MAP(CAudioTab)
	ON_BN_CLICKED(IDC_BTN_AUDIO_DETECT, OnBtnAudioDetect)
	ON_CBN_SELCHANGE(IDC_AUDIO_LIST, OnSelchangeAudioList)
	ON_WM_HELPINFO()
	ON_MESSAGE(WM_COMMANDHELP,OnCommandHelp)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CAudioTab message handlers

void CAudioTab::OnBtnAudioDetect() 
{
	// TODO: Add your control notification handler code here
	int i;

	// Set the wait cursor
	CWaitCursor wc;

	// Display the scanning window
	m_MsgDlg.m_ScanningMsg.LoadString(IDS_AUDIOTAB_SCANNING);
	m_MsgDlg.m_WaitMsg.LoadString(IDS_PLEASE_WAIT_MSG);
	m_MsgDlg.Create(IDD_MSG_DLG,this);
	m_MsgDlg.ShowWindow(SW_SHOW);
	m_MsgDlg.UpdateData(FALSE);

	m_audio_list.ResetContent();
	detect_sound_cards(1);

	// Remove the scanning window
	m_MsgDlg.DestroyWindow();

	for (i=0; i<Num_cards; i++)
		m_audio_list.InsertString(i, Cards[i].name);

	// Set selection and available mixer settings
	m_audio_list.SetCurSel(Num_cards - 1);
	EnableMixerSettings(Cards[Num_cards-1].mixers);

	// Automatically default to software (if available)
	SetMixerButton(DetermineDefaultMixer(Num_cards-1),Cards[Num_cards-1].mixers);
}

void CAudioTab::OnOK() 
{
	bool ds16_supported;

	int current = m_audio_list.GetCurSel();

	if ((current < 0) || (current >= Num_cards)) {
		current = 0;
	}

	// See if the chosen card supports direct sound 16 bit
	if(Cards[current].mixers & DS16BIT_MIXER)
		ds16_supported=TRUE;
	else
		ds16_supported=FALSE;

	os_config_write_string(szSectionName, "SoundcardName", Cards[current].name);

	int mixer_id;
	mixer_id=GetMixerButton();

	// For Chris, make DS8 be the mixer if user has a card selected 
	// (other than No sound) and no sound mixers could be detected for
	// the device
	if(current>0 && mixer_id==SOUND_MIXER_NONE)
		mixer_id=SOUND_MIXER_DS_8;

	// If user has ds16 support, and has chosen direct sound, use it
	if(mixer_id==SOUND_MIXER_DS_8 && ds16_supported)
		mixer_id=SOUND_MIXER_DS_16;

	// Write out the default mixer
	os_config_write_uint(NULL, "SoundMixer", mixer_id);

	// Write out the Launcher sound setting
	LauncherSoundEnabled=m_LauncherSndCheck.GetCheck();
	os_config_write_uint(szSectionName, "LauncherSoundEnabled", LauncherSoundEnabled);
	
	CPropertyPage::OnOK();
}

BOOL CAudioTab::OnInitDialog() 
{
	CPropertyPage::OnInitDialog();
	
	// TODO: Add extra initialization here
	char *current_card;
	int i, current;
	int allow_user_to_choose_ds3d = 0;
	UINT mixer_id;

	// Set the wait cursor
	CWaitCursor wc;

	// Clear the box
	m_audio_list.ResetContent();

	// Display the scanning window
	m_MsgDlg.m_ScanningMsg.LoadString(IDS_AUDIOTAB_SCANNING);
	m_MsgDlg.m_WaitMsg.LoadString(IDS_PLEASE_WAIT_MSG);
	m_MsgDlg.Create(IDD_MSG_DLG,this);
	m_MsgDlg.ShowWindow(SW_SHOW);
	m_MsgDlg.UpdateData(FALSE);

	// Detect all cards and fill the list
	detect_sound_cards(1);
	for (i=0; i<Num_cards; i++)
		m_audio_list.InsertString(i, Cards[i].name);

	// Remove the scanning window
	m_MsgDlg.DestroyWindow();

	// Get current card name from the registry
	current_card = os_config_read_string(szSectionName, "SoundcardName", NULL);

	// Get the currently selected mixer
	mixer_id = os_config_read_uint(NULL, "SoundMixer", SOUND_MIXER_NONE);

	current=-1;
	if (current_card) {
		i = m_audio_list.FindStringExact(-1, current_card);
		if (i != CB_ERR)
			current = i;
		else {
			// User's selected card could not be detected!
			CString card_missing_msg, title_msg;
			card_missing_msg.Format(IDS_AUDIOTAB_CARD_MISSING,current_card);
			title_msg.LoadString(IDS_AUDIOTAB_WARNING);
			MessageBox(card_missing_msg,title_msg, MB_OK | MB_ICONEXCLAMATION );
		}
	}
	else if (Num_cards>0) { 
		current=0;		
	}

	if (current < 0) {
		current = Num_cards - 1;
		mixer_id=DetermineDefaultMixer(current);
	}

	// If it's the first time since install, autodetect the best card
	if(theApp.m_straight_to_setup) {
		current=DetermineBestCard();
		mixer_id=DetermineDefaultMixer(current);
	}

	// Set the current selection and available mixers
	m_audio_list.SetCurSel(current);
	EnableMixerSettings(Cards[current].mixers);

	SetMixerButton(mixer_id,Cards[current].mixers);

	// Set the Launcher sound check button if necessary
	LauncherSoundEnabled = os_config_read_uint(szSectionName, "LauncherSoundEnabled", 1);
	m_LauncherSndCheck.SetCheck(LauncherSoundEnabled);

	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}


void CAudioTab::OnSelchangeAudioList() 
{
	// TODO: Add your control notification handler code here
	int index;
	index=m_audio_list.GetCurSel();
	if(index!=CB_ERR && index<Num_cards) {
		EnableMixerSettings(Cards[index].mixers);

		// Automatically default to software (if available)
		SetMixerButton(DetermineDefaultMixer(index),Cards[index].mixers);
	}
}


// Determine the sound card with the most available mixers (for auto-detection)
int CAudioTab::DetermineBestCard(void)
{
	int card_pos=0;
	int j;

	for(j=0;j<Num_cards;j++) 
		if(Cards[j].mixers >= Cards[card_pos].mixers) card_pos=j;

	return(card_pos);
}


// Enables/disables mixer options according to given mixer flags
void CAudioTab::EnableMixerSettings(UINT mixers)
{
	HWND hwnd;

	GetDlgItem(IDC_MIXER_SOFTWARE,&hwnd);
	::EnableWindow(hwnd, mixers & SOFTWARE_MIXER);

	GetDlgItem(IDC_MIXER_DS8BIT,&hwnd);
	::EnableWindow(hwnd, mixers & DS8BIT_MIXER);

/* We're not handling directsound 8 or 16 visually anymore
	GetDlgItem(IDC_MIXER_DS16BIT,&hwnd);
	::EnableWindow(hwnd, mixers & DS16BIT_MIXER);
*/

	GetDlgItem(IDC_MIXER_DS3D,&hwnd);
	::EnableWindow(hwnd, mixers & DS3D_MIXER);

	GetDlgItem(IDC_MIXER_EAX,&hwnd);
	::EnableWindow(hwnd, mixers & EAX_MIXER);
}

// selects the radio button corresponding to given registry ID
void CAudioTab::SetMixerButton(int mixer_id, UINT mixer_flags) 
{
	// Turn them all off
	((CButton *) GetDlgItem(IDC_MIXER_SOFTWARE))->SetCheck(0);
	((CButton *) GetDlgItem(IDC_MIXER_DS16BIT))->SetCheck(0);
	((CButton *) GetDlgItem(IDC_MIXER_DS8BIT))->SetCheck(0);
	((CButton *) GetDlgItem(IDC_MIXER_DS3D))->SetCheck(0);
	((CButton *) GetDlgItem(IDC_MIXER_EAX))->SetCheck(0);

	// Now, check the appropriate one
	switch(mixer_id) {
		case SOUND_MIXER_SOFTWARE_16:
			if(mixer_flags & SOFTWARE_MIXER)
				((CButton *) GetDlgItem(IDC_MIXER_SOFTWARE))->SetCheck(1);
			break;

		// Now set and DS mixer to Default
		case SOUND_MIXER_DS_16:
			if(mixer_flags & DS16BIT_MIXER)
				((CButton *) GetDlgItem(IDC_MIXER_DS8BIT))->SetCheck(1);
			break;

		case SOUND_MIXER_DS_8:
			if(mixer_flags & DS8BIT_MIXER)
				((CButton *) GetDlgItem(IDC_MIXER_DS8BIT))->SetCheck(1);
			break;

		case SOUND_MIXER_DS3D_16:
			if(mixer_flags & DS3D_MIXER)
				((CButton *) GetDlgItem(IDC_MIXER_DS3D))->SetCheck(1);
			break;
		case SOUND_MIXER_EAX:
			if(mixer_flags & EAX_MIXER)
				((CButton *) GetDlgItem(IDC_MIXER_EAX))->SetCheck(1);
			break;
		default:
			break;
	}
}

// Returns the registry ID for the selected radio button
int CAudioTab::GetMixerButton(void) 
{
	int mixer_id=SOUND_MIXER_NONE;

	if ( ((CButton *) GetDlgItem(IDC_MIXER_SOFTWARE))->GetCheck() == 1 )
		mixer_id=SOUND_MIXER_SOFTWARE_16;
/*
	else if ( ((CButton *) GetDlgItem(IDC_MIXER_DS16BIT))->GetCheck() == 1 )
		mixer_id=SOUND_MIXER_DS_16;
*/
	else if ( ((CButton *) GetDlgItem(IDC_MIXER_DS8BIT))->GetCheck() == 1 )
		mixer_id=SOUND_MIXER_DS_8;
	else if ( ((CButton *) GetDlgItem(IDC_MIXER_DS3D))->GetCheck() == 1 )
		mixer_id=SOUND_MIXER_DS3D_16;
	else if ( ((CButton *) GetDlgItem(IDC_MIXER_EAX))->GetCheck() == 1 )
		mixer_id=SOUND_MIXER_EAX;

	return(mixer_id);
}

// Returns the default mixer for a given card index
UINT CAudioTab::DetermineDefaultMixer(int card_index)
{
	int mixer_type;

	// make 8 bit direct sound the generic default
	mixer_type=SOUND_MIXER_DS_8;

	// make sure index is valid
	if(card_index<0 || card_index>=Num_cards)
		return(mixer_type);

	// if mixer supports software, make it the default
	if(Cards[card_index].mixers & SOFTWARE_MIXER)
		mixer_type=SOUND_MIXER_SOFTWARE_16;

	return(mixer_type);
}

// Display the html help file
BOOL CAudioTab::OnHelpInfo(HELPINFO* pHelpInfo) 
{
#ifdef USE_HTML_HELP_SYSTEM
	CWaitCursor wc;
	help_launch(AUDIOTAB_HELP);
	return 1;
#else
	return CPropertyPage::OnHelpInfo(pHelpInfo);
#endif
}

// Display the html help file
afx_msg LRESULT CAudioTab::OnCommandHelp(WPARAM wParam, LPARAM lParam)
{
#ifdef USE_HTML_HELP_SYSTEM
	help_launch(AUDIOTAB_HELP);
	return 1;
#else
	return CPropertyPage::OnCommandHelp(wParam,lParam);
#endif
}