Sample Code
Windows Driver Samples/ Msgsm610 Sample Codec/ C++/ config.c/
//==========================================================================;
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//
// Copyright (c) 1993-1999 Microsoft Corporation
//
//--------------------------------------------------------------------------;
//
// config.c
//
// Description:
// GSM 6.10 configuration init and dialog
//
//
// The configuration parameters for this codec are:
//
// MaxRTEncodeSetting:
// MaxRTDecodeSetting:
// These determine the highest mono sample rate that
// the codec will attempt to convert in real-time.
//
// PercentCPU:
// This configuration parameter is not normally changed
// by the user and is not presented in the config dialog.
// This value affects the config dialog's 'Auto-Config'
// calculation of MaxRTXxcodeSamplesPerSec.
//
// These parameters may be set in the registry, using the gsm610 subkey
// (which corresponds to the alias name used for installation) under
// the following key:
//
// HKEY_CURRENT_USER\Software\Microsoft\Multimedia
//
//==========================================================================;
#include <windows.h>
#include <windowsx.h>
#include <mmsystem.h>
#include <memory.h>
#include <mmreg.h>
#include <msacm.h>
#include <msacmdrv.h>
#include "codec.h"
#include "gsm610.h"
#include "debug.h"
#ifdef WIN32
#include <tchar.h>
#else
#define _tcstoul strtoul
#define _tcsncpy _fstrncpy
#endif
#include <string.h>
#include <stdlib.h>
#include <strsafe.h>
#ifndef NUMELMS
#define NUMELMS(a) (sizeof(a) / sizeof((a)[0]))
#endif
//
// Strings required to access configuration information in the registry.
//
const TCHAR BCODE gszMaxRTEncodeSetting[] = TEXT("MaxRTEncodeSetting");
const TCHAR BCODE gszMaxRTDecodeSetting[] = TEXT("MaxRTDecodeSetting");
const TCHAR BCODE gszPercentCPU[] = TEXT("PercentCPU");
const TCHAR gszMultimediaKey[] = TEXT("Software\\Microsoft\\Multimedia\\");
#define MSGSM610_CONFIG_TEXTLEN 80
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//
// Be careful changing the following!
//
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//
// Data required to access the dialog box help.
//
// Note that you must write your own help file for your codec, even if
// the configuration dialog box looks identical. If you use the file
// listed here, then the title will say "GSM 6.10" or something.
//
// Note: the number HELPCONTEXT_MSGSM610 must be unique in the file
// gszHelpFilename, and the number must defined in the [MAP]
// section of the .hpj help project file. Then the .rtf file
// will reference that number (using the keyword defined in
// the .hpj file). Then when we call WinHelp with the number,
// WinHelp will go to the right help entry.
//
const TCHAR BCODE gszHelpFilename[] = TEXT("audiocdc.hlp");
#define HELPCONTEXT_MSGSM610 1002
#define IDH_AUDIOCDC_COMPRESSION 100
#define IDH_AUDIOCDC_DECOMPRESSION 200
#define IDH_AUDIOCDC_AUTOCONFIGURE 300
static int aKeyWordIds[] = {
IDC_COMBO_MAXRTENCODE, IDH_AUDIOCDC_COMPRESSION,
IDC_STATIC_COMPRESS, IDH_AUDIOCDC_COMPRESSION,
IDC_COMBO_MAXRTDECODE, IDH_AUDIOCDC_DECOMPRESSION,
IDC_STATIC_DECOMPRESS, IDH_AUDIOCDC_DECOMPRESSION,
IDC_BTN_AUTOCONFIG, IDH_AUDIOCDC_AUTOCONFIGURE,
0, 0
};
//==========================================================================;
//
//
//
//
//==========================================================================;
LPVOID FNLOCAL GlobalAllocLock(HGLOBAL far * ph, DWORD dwc)
{
*ph = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, dwc);
if (NULL != *ph)
return GlobalLock(*ph);
else
return NULL;
}
VOID FNLOCAL GlobalUnlockFree(LPVOID p, HGLOBAL h)
{
if (NULL != h)
{
if (NULL != p) GlobalUnlock(h);
GlobalFree(h);
}
return;
}
//==========================================================================;
//
//
//
//
//==========================================================================;
//--------------------------------------------------------------------------;
//
// VOID configWriteConfiguration
//
// Description:
//
// This routine writes the configuration data in PDI to the registry.
// This consists of the max real-time Encode and Decode settings.
//
// Arguments:
// PDRIVERINSTANCE pdi
//
// Return (VOID): None.
//
//--------------------------------------------------------------------------;
VOID configWriteConfiguration
(
PDRIVERINSTANCE pdi
)
{
DWORD dw;
if( NULL != pdi->hkey )
{
dw = (DWORD)pdi->nConfigMaxRTEncodeSetting;
(void)RegSetValueEx( pdi->hkey, (LPTSTR)gszMaxRTEncodeSetting, 0,
REG_DWORD, (LPBYTE)&dw, sizeof(DWORD) );
dw = (DWORD)pdi->nConfigMaxRTDecodeSetting;
(void)RegSetValueEx( pdi->hkey, (LPTSTR)gszMaxRTDecodeSetting, 0,
REG_DWORD, (LPBYTE)&dw, sizeof(DWORD) );
}
}
//--------------------------------------------------------------------------;
//
// DWORD dwReadRegistryDefault
//
// Description:
//
// This routine reads a given value from the registry, and returns a
// default value if the read is not successful.
//
// Arguments:
// HKEY hkey: Registry key to read from.
// LPTSTR lpszEntry:
// DWORD dwDefault:
//
// Return (DWORD):
//
//--------------------------------------------------------------------------;
INLINE DWORD dwReadRegistryDefault
(
HKEY hkey,
_In_ LPTSTR lpszEntry,
DWORD dwDefault
)
{
DWORD dwType = (DWORD)~REG_DWORD; // Init to anything but REG_DWORD.
DWORD cbSize = sizeof(DWORD);
DWORD dwRet;
LONG lError;
ASSERT( NULL != hkey );
ASSERT( NULL != lpszEntry );
lError = RegQueryValueEx( hkey,
lpszEntry,
NULL,
&dwType,
(LPBYTE)&dwRet,
&cbSize );
if( ERROR_SUCCESS != lError || REG_DWORD != dwType )
dwRet = dwDefault;
return dwRet;
}
//--------------------------------------------------------------------------;
//
// VOID configSetDefaults
//
// Description:
//
// This routine sets the configuration parameters to their default
// values.
//
// Arguments:
// PDRIVERINSTANCE pdi:
//
//--------------------------------------------------------------------------;
VOID configSetDefaults
(
PDRIVERINSTANCE pdi
)
{
pdi->nConfigMaxRTEncodeSetting =
MSGSM610_CONFIG_DEFAULT_MAXRTENCODESETTING;
pdi->nConfigMaxRTDecodeSetting =
MSGSM610_CONFIG_DEFAULT_MAXRTDECODESETTING;
pdi->nConfigPercentCPU =
MSGSM610_CONFIG_DEFAULT_PERCENTCPU;
}
//--------------------------------------------------------------------------;
//
// UINT configAutoConfig
//
// Description:
//
// We will determine how much time it takes to encode and then decode
// 2 seconds of data and use this to guess at the max sample
// rate we can convert in real-time.
//
// The max is computed with essentially 100% of the CPU. Practically,
// we won't have 100% of the CPU available. So we take a percentage
// of the computed max and use that as the max in the config dialog.
//
// The percentage that we use can be set in the ini file gsm610
// section by PercentCPU=xx.
//
//
// Arguments:
// HWND hwnd:
//
// Return (UINT): String identifier (IDS) of error message, or zero if
// the call succeeded.
//
//--------------------------------------------------------------------------;
UINT FNLOCAL configAutoConfig
(
PDRIVERINSTANCE pdi,
UINT *pnEncodeSetting,
UINT *pnDecodeSetting
)
{
UINT nConfig;
UINT uIDS;
HCURSOR hCursorSave;
PSTREAMINSTANCE psi;
HGLOBAL hbPCM;
HGLOBAL hbGSM;
HGLOBAL hpcmwf;
HGLOBAL hgsmwf;
HGLOBAL hadsi;
HGLOBAL hadsh;
LPBYTE pbPCM, pbGSM;
DWORD cbPCMLength, cbGSMLength;
LPPCMWAVEFORMAT ppcmwf;
LPGSM610WAVEFORMAT pgsmwf;
LPACMDRVSTREAMINSTANCE padsi;
LPACMDRVSTREAMHEADER padsh;
DWORD dwTime;
DWORD dwMaxRate;
//
// We divide by this!
//
ASSERT( 0 != pdi->nConfigPercentCPU );
//
// Init stuff that gets cleaned up at errReturn
//
//
uIDS = 0;
psi = NULL;
hbPCM = NULL;
hbGSM = NULL;
hpcmwf = NULL;
hgsmwf = NULL;
hadsi = NULL;
hadsh = NULL;
pbPCM = NULL;
pbGSM = NULL;
ppcmwf = NULL;
pgsmwf = NULL;
padsi = NULL;
padsh = NULL;
//
// This function may take a while. Set hour glass cursor
//
//
hCursorSave = SetCursor(LoadCursor(NULL, IDC_WAIT));
//
// Allocate memory for all our structures
//
//
psi = (PSTREAMINSTANCE)LocalAlloc(LPTR, sizeof(*psi));
cbPCMLength = 2 * (8000 / 1 * 2);
cbGSMLength = 2 * (8000 / 320 * 65);
pbPCM = GlobalAllocLock(&hbPCM, cbPCMLength);
pbGSM = GlobalAllocLock(&hbGSM, cbGSMLength);
ppcmwf = GlobalAllocLock(&hpcmwf, sizeof(*ppcmwf));
pgsmwf = GlobalAllocLock(&hgsmwf, sizeof(*pgsmwf));
padsi = GlobalAllocLock(&hadsi, sizeof(*padsi));
padsh = GlobalAllocLock(&hadsh, sizeof(*padsh));
//
// if we couldn't allocate some of the memory
//
//
if ( (psi == NULL) ||
(pbPCM == NULL) ||
(pbGSM == NULL) ||
(ppcmwf == NULL) ||
(pgsmwf == NULL) ||
(padsi == NULL) ||
(padsh == NULL) )
{
uIDS = IDS_ERROR_NOMEM;
goto errReturn;
}
//
//
//
//
// Fill in format structures for GSM 6.10 and PCM
//
//
pgsmwf->wfx.wFormatTag = WAVE_FORMAT_GSM610;
pgsmwf->wfx.nChannels = 1;
pgsmwf->wfx.nSamplesPerSec = 8000;
pgsmwf->wfx.nAvgBytesPerSec = 8000 / 320 * 65;
pgsmwf->wfx.nBlockAlign = 65;
pgsmwf->wfx.wBitsPerSample = 0;
pgsmwf->wfx.cbSize = 0;
pgsmwf->wSamplesPerBlock = 320;
ppcmwf->wf.wFormatTag = WAVE_FORMAT_PCM;
ppcmwf->wf.nChannels = 1;
ppcmwf->wf.nSamplesPerSec = 8000;
ppcmwf->wf.nAvgBytesPerSec = 8000 / 1 * 2;
ppcmwf->wf.nBlockAlign = 2;
ppcmwf->wBitsPerSample = 16;
//
// get the time, do encode, get the time. btw, we've never written
// any data into our audio data buffers. we don't know what's in
// them nor do we care. we just want to see how long it takes to
// perform the conversion.
//
//
dwTime = timeGetTime();
padsi->cbStruct = sizeof(*padsi);
padsi->pwfxSrc = (LPWAVEFORMATEX) ppcmwf;
padsi->pwfxDst = (LPWAVEFORMATEX) pgsmwf;
padsi->dwDriver = (DWORD_PTR) psi;
padsh->cbStruct = sizeof(*padsh);
padsh->pbSrc = pbPCM;
padsh->cbSrcLength = cbPCMLength;
padsh->pbDst = pbGSM;
padsh->cbDstLength = cbGSMLength;
padsh->fdwConvert = ACM_STREAMCONVERTF_BLOCKALIGN | ACM_STREAMCONVERTF_START;
gsm610Encode(padsi, padsh);
dwTime = timeGetTime() - dwTime;
//
// calculate what we might be able to do in real-time
//
//
if (dwTime == 0)
dwMaxRate = 0xFFFFFFFFL;
else
dwMaxRate = (1000L * 2L * ppcmwf->wf.nSamplesPerSec / dwTime);
if ( (0xFFFFFFFFL / pdi->nConfigPercentCPU) >= dwMaxRate )
dwMaxRate = dwMaxRate * pdi->nConfigPercentCPU / 100;
if (dwMaxRate > 0xFFFFL)
dwMaxRate = 0xFFFFL;
DPF(1,"Encode dwMaxRate=%u", dwMaxRate);
//
// Now set the configuration based on dwMaxRate. We scan the
// gaRateListFormat[] array looking at the dwMonoRate to determine
// the appropriate setting.
//
nConfig = 0;
while( gaRateListFormat[nConfig].dwMonoRate < dwMaxRate &&
MSGSM610_CONFIG_NUMSETTINGS > nConfig )
{
nConfig++;
}
*pnEncodeSetting = nConfig - 1; // We went too far.
//
// get the time, do decode, get the time
//
//
dwTime = timeGetTime();
padsi->cbStruct = sizeof(*padsi);
padsi->pwfxSrc = (LPWAVEFORMATEX) pgsmwf;
padsi->pwfxDst = (LPWAVEFORMATEX) ppcmwf;
padsi->dwDriver = (DWORD_PTR) psi;
padsh->cbStruct = sizeof(*padsh);
padsh->pbSrc = pbGSM;
padsh->cbSrcLength = cbGSMLength;
padsh->pbDst = pbPCM;
padsh->cbDstLength = cbPCMLength;
padsh->fdwConvert = ACM_STREAMCONVERTF_BLOCKALIGN | ACM_STREAMCONVERTF_START;
gsm610Decode(padsi, padsh);
dwTime = timeGetTime() - dwTime;
//
// calculate what we might be able to do in real-time
//
//
if (dwTime == 0)
dwMaxRate = 0xFFFFFFFFL;
else
dwMaxRate = (1000L * 2L * ppcmwf->wf.nSamplesPerSec / dwTime);
if ( (0xFFFFFFFFL / pdi->nConfigPercentCPU) >= dwMaxRate )
dwMaxRate = dwMaxRate * pdi->nConfigPercentCPU / 100;
if (dwMaxRate > 0xFFFFL)
dwMaxRate = 0xFFFFL;
DPF(1,"Decode dwMaxRate=%u", dwMaxRate);
//
// Now set the configuration based on these values. We scan the
// gaRateListFormat[] array looking at the dwMonoRate to determine
// the appropriate setting.
//
nConfig = 0;
while( gaRateListFormat[nConfig].dwMonoRate < dwMaxRate &&
MSGSM610_CONFIG_NUMSETTINGS > nConfig )
{
nConfig++;
}
*pnDecodeSetting = nConfig - 1; // We went too far.
//
// Clean up
//
//
errReturn:
GlobalUnlockFree(padsh, hadsh);
GlobalUnlockFree(padsi, hadsi);
GlobalUnlockFree(ppcmwf, hpcmwf);
GlobalUnlockFree(pgsmwf, hgsmwf);
GlobalUnlockFree(pbPCM, hbPCM);
GlobalUnlockFree(pbGSM, hbGSM);
LocalFree(psi);
SetCursor(hCursorSave);
return uIDS;
}
//==========================================================================;
//
//
//
//
//==========================================================================;
//--------------------------------------------------------------------------;
//
// BOOL acmdDlgProcConfigure
//
// Description:
// This routine handles the configuration dialog box.
//
// Arguments:
// HWND hwnd:
//
// UINT uMsg:
//
// WPARAM wParam:
//
// LPARAM lParam:
//
// Return (BOOL):
//
//
// Note: In order to avoid using a static fHelpRunning flag which will
// still be here after we exit, we allocate an fHelpRunning
// variable in the DRIVERINSTANCE structure. This is purely to
// avoid static variables (which force us to have a data segment
// of 4K); the fHelpRunning is not used in any other procedures.
//
//--------------------------------------------------------------------------;
INT_PTR FNWCALLBACK acmdDlgProcConfigure
(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
)
{
PDRIVERINSTANCE pdi;
HWND hctrlEnc;
HWND hctrlDec;
UINT uCmdId;
UINT u;
int n;
TCHAR szFormat[MSGSM610_CONFIG_TEXTLEN];
TCHAR szOutput[MSGSM610_CONFIG_TEXTLEN];
UINT nConfigMaxRTEncodeSetting;
UINT nConfigMaxRTDecodeSetting;
switch (uMsg)
{
case WM_INITDIALOG:
pdi = (PDRIVERINSTANCE)lParam;
pdi->fHelpRunning = FALSE; // Used only in this procedure.
#ifdef WIN4
//
// This driver is marked Windows Subsystem version 3.5 in order
// that it be compatible with Daytona - however, that means that
// Chicago will think it is a Win 3.1 application and give it
// Win 3.1 default colors. This makes the config dialog look
// white, whereas the Chicago default uses 3DFACE. This code
// (and the CTLCOLOR messages) sets the colors explicitly.
//
pdi->hbrDialog = CreateSolidBrush( GetSysColor(COLOR_3DFACE) );
#endif
SetWindowLongPtr(hwnd, DWLP_USER, lParam);
nConfigMaxRTEncodeSetting = pdi->nConfigMaxRTEncodeSetting;
nConfigMaxRTDecodeSetting = pdi->nConfigMaxRTDecodeSetting;
hctrlEnc = GetDlgItem(hwnd, IDC_COMBO_MAXRTENCODE);
hctrlDec = GetDlgItem(hwnd, IDC_COMBO_MAXRTDECODE);
for( u=0; u<MSGSM610_CONFIG_NUMSETTINGS; u++ )
{
LoadString( pdi->hinst, gaRateListFormat[u].idsFormat,
szFormat, SIZEOF(szFormat) );
switch( gaRateListFormat[u].uFormatType )
{
case CONFIG_RLF_NONUMBER:
(void)StringCchCopy(szOutput, NUMELMS(szOutput), szFormat);
break;
case CONFIG_RLF_MONOONLY:
(void)StringCchPrintf(szOutput, NUMELMS(szOutput), szFormat,
gaRateListFormat[u].dwMonoRate);
break;
}
ComboBox_AddString(hctrlEnc, szOutput);
ComboBox_AddString(hctrlDec, szOutput);
}
ComboBox_SetCurSel( hctrlEnc, nConfigMaxRTEncodeSetting );
ComboBox_SetCurSel( hctrlDec, nConfigMaxRTDecodeSetting );
return (TRUE);
case WM_DESTROY:
pdi = (PDRIVERINSTANCE)GetWindowLongPtr(hwnd, DWLP_USER);
if (pdi->fHelpRunning)
{
WinHelp(hwnd, gszHelpFilename, HELP_QUIT, 0L);
}
#ifdef WIN4
DeleteObject( pdi->hbrDialog );
#endif
//
// Let dialog box process this message
//
//
return (FALSE);
#ifdef WIN4
//
// Handle CTLCOLOR messages to get the dialog boxes to the default
// Chicago colors. See the INITDIALOG message, above.
//
case WM_CTLCOLORSTATIC:
case WM_CTLCOLORDLG:
case WM_CTLCOLORBTN:
SetTextColor( (HDC)wParam, GetSysColor(COLOR_WINDOWTEXT) );
SetBkColor( (HDC)wParam, GetSysColor(COLOR_3DFACE) );
pdi = (PDRIVERINSTANCE)GetWindowLongPtr(hwnd, DWLP_USER);
return (UINT_PTR)(pdi->hbrDialog);
#endif
case WM_HELP:
WinHelp(((LPHELPINFO)lParam)->hItemHandle, gszHelpFilename,
HELP_WM_HELP, (ULONG_PTR)aKeyWordIds);
return TRUE;
case WM_COMMAND:
pdi = (PDRIVERINSTANCE)GetWindowLongPtr(hwnd, DWLP_USER);
uCmdId = (UINT) wParam;
switch (uCmdId)
{
case IDC_BTN_AUTOCONFIG:
{
UINT uErrorIDS;
uErrorIDS = configAutoConfig( pdi,
&nConfigMaxRTEncodeSetting,
&nConfigMaxRTDecodeSetting );
if( 0==uErrorIDS )
{
//
// No error - set dialog box settings.
//
hctrlEnc = GetDlgItem( hwnd, IDC_COMBO_MAXRTENCODE );
ComboBox_SetCurSel( hctrlEnc, nConfigMaxRTEncodeSetting );
hctrlDec = GetDlgItem( hwnd, IDC_COMBO_MAXRTDECODE );
ComboBox_SetCurSel( hctrlDec, nConfigMaxRTDecodeSetting );
}
else
{
//
// Display error message.
//
TCHAR tstrErr[200];
TCHAR tstrErrTitle[200];
if (0 == LoadString(pdi->hinst, IDS_ERROR, tstrErrTitle, SIZEOF(tstrErrTitle)))
break;
if (0 == LoadString(pdi->hinst, uErrorIDS, tstrErr, SIZEOF(tstrErr)))
break;
MessageBox(hwnd, tstrErr, tstrErrTitle, MB_ICONEXCLAMATION | MB_OK);
}
}
break;
case IDOK:
n = DRVCNF_CANCEL;
//
// RT Encode setting
//
hctrlEnc = GetDlgItem(hwnd, IDC_COMBO_MAXRTENCODE);
nConfigMaxRTEncodeSetting = ComboBox_GetCurSel( hctrlEnc );
if (nConfigMaxRTEncodeSetting != pdi->nConfigMaxRTEncodeSetting)
{
pdi->nConfigMaxRTEncodeSetting = nConfigMaxRTEncodeSetting;
n = DRVCNF_OK;
}
//
// RT Decode setting
//
hctrlDec = GetDlgItem(hwnd, IDC_COMBO_MAXRTDECODE);
nConfigMaxRTDecodeSetting = ComboBox_GetCurSel( hctrlDec );
if (nConfigMaxRTDecodeSetting != pdi->nConfigMaxRTDecodeSetting)
{
pdi->nConfigMaxRTDecodeSetting = nConfigMaxRTDecodeSetting;
n = DRVCNF_OK;
}
//
// If we changed something, write the data to the
// registry.
//
if( DRVCNF_OK == n )
{
configWriteConfiguration( pdi );
}
EndDialog(hwnd, DRVCNF_OK);
break;
case IDCANCEL:
EndDialog(hwnd, DRVCNF_CANCEL);
break;
case IDC_BTN_HELP:
pdi->fHelpRunning = TRUE;
WinHelp(hwnd, gszHelpFilename, HELP_CONTEXT, HELPCONTEXT_MSGSM610);
break;
}
return (TRUE);
}
return (FALSE);
} // gsm610DlgProcConfigure()
//--------------------------------------------------------------------------;
//
// BOOL acmdDriverConfigInit
//
// Description:
// This routine initializes the configuration parameters by reading them
// from the registry. If there are no entries in the registry, this
// codec auto-configures itself and writes the results to the registry.
// If the auto-configure fails, or if we don't know our alias name,
// then we set the configuration to default values.
//
// Arguments:
// PDRIVERINSTANCE pdi:
//
// LPCTSTR pszAliasName:
//
// Return (BOOL):
//
//
//--------------------------------------------------------------------------;
BOOL FNGLOBAL acmdDriverConfigInit
(
PDRIVERINSTANCE pdi,
LPCTSTR pszAliasName
)
{
UINT nEncodeSetting;
UINT nDecodeSetting;
UINT uErrorIDS;
//
// If pszAliasName is NULL then just set all defaults
//
//
if (NULL == pszAliasName)
{
DPF(2,"acmdDriverConfigInit: no alias name; using default settings.");
configSetDefaults( pdi );
return (TRUE);
}
//
// If we haven't got an open hkey, then open it. Note that this routine
// may be called more than once; on the second time, we should not
// re-open the key.
//
if( NULL == pdi->hkey )
{
HKEY hkey;
LONG error;
error = RegCreateKeyEx( MSGSM610_CONFIG_DEFAULTKEY, gszMultimediaKey, 0,
NULL, 0, KEY_CREATE_SUB_KEY, NULL, &hkey, NULL );
if (error == ERROR_SUCCESS)
{
ASSERT( NULL != pszAliasName );
ASSERT( NULL != hkey );
RegCreateKeyEx( hkey, pszAliasName, 0, NULL, 0,
KEY_SET_VALUE | KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS,
NULL, &pdi->hkey, NULL );
RegCloseKey( hkey );
}
}
//
// Read configuration data from registry.
//
if( NULL == pdi->hkey )
{
configSetDefaults( pdi );
}
else
{
pdi->nConfigMaxRTEncodeSetting =
(UINT)dwReadRegistryDefault( pdi->hkey,
(LPTSTR)gszMaxRTEncodeSetting,
MSGSM610_CONFIG_UNCONFIGURED );
pdi->nConfigMaxRTDecodeSetting =
(UINT)dwReadRegistryDefault( pdi->hkey,
(LPTSTR)gszMaxRTDecodeSetting,
MSGSM610_CONFIG_UNCONFIGURED );
pdi->nConfigPercentCPU =
(UINT)dwReadRegistryDefault( pdi->hkey,
(LPTSTR)gszPercentCPU,
MSGSM610_CONFIG_DEFAULT_PERCENTCPU );
//
// Check that nConfigPercentCPU is a valid value.
//
if( pdi->nConfigPercentCPU <= 0 )
{
pdi->nConfigPercentCPU = MSGSM610_CONFIG_DEFAULT_PERCENTCPU;
}
}
//
// If either the encode or decode setting is out of range, then
// we call the auto-configure routine and write out the results.
// This should only happen the first time the codec is run.
//
if( MSGSM610_CONFIG_NUMSETTINGS <= pdi->nConfigMaxRTEncodeSetting ||
MSGSM610_CONFIG_NUMSETTINGS <= pdi->nConfigMaxRTDecodeSetting )
{
DPF( 1, "acmdDriverConfigInit: performing initial auto-config." );
uErrorIDS = configAutoConfig( pdi,
&nEncodeSetting,
&nDecodeSetting );
if( 0 != uErrorIDS )
{
//
// Error in auto-config. Use defaults instead.
//
nEncodeSetting = MSGSM610_CONFIG_DEFAULT_MAXRTENCODESETTING;
nDecodeSetting = MSGSM610_CONFIG_DEFAULT_MAXRTDECODESETTING;
}
pdi->nConfigMaxRTEncodeSetting = nEncodeSetting;
pdi->nConfigMaxRTDecodeSetting = nDecodeSetting;
//
// Always write the results to the registry, even if we hit an
// error, so we won't hit the automatic auto-config next
// time we run. One failure is enough!
//
configWriteConfiguration( pdi );
}
return (TRUE);
} // acmdDriverConfigInit()
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