config.c

一个关于声音驱动的例子程序一个关于声音驱动的例子程序一个关于声音驱动的例子程序

//==========================================================================;
//
//  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>


//
//  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,
    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 )