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mfcwave.cpp
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mfcwave.cpp
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/*****************************************************************************/
/* MFCWAVE.CPP : class implementation for wave base classes */
/*****************************************************************************/
/******************************************************************************
Copyright (C) 2006 Hermann Seib
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
******************************************************************************/
/*****************************************************************************/
/* Includes */
/*****************************************************************************/
#include "stdafx.h"
#include "mfcwave.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/*****************************************************************************/
/* Global Data */
/*****************************************************************************/
static char szWMapName[] = WMAP_NAME; /* Wave Mapper device name */
/*===========================================================================*/
/* CWaveBuffer class members */
/*===========================================================================*/
/*****************************************************************************/
/* CWaveBuffer : constructor (various styles) */
/*****************************************************************************/
CWaveBuffer::CWaveBuffer(DWORD dwLen)
{
Init();
Set(dwLen);
}
CWaveBuffer::CWaveBuffer(LPWAVEHDR lpHdr)
{
Init();
Set(lpHdr);
}
CWaveBuffer::CWaveBuffer(LPVOID lpBuf, DWORD dwLen)
{
Init();
Set(lpBuf, dwLen);
}
/*****************************************************************************/
/* Set : sets Wave buffer in various ways */
/*****************************************************************************/
void CWaveBuffer::Set(DWORD dwLen)
{
Set((LPVOID)NULL, dwLen);
}
void CWaveBuffer::Set(LPWAVEHDR lpHdr)
{
Empty();
this->lpHdr = lpHdr;
}
void CWaveBuffer::Set(LPVOID lpBuf, DWORD dwLen)
{
Empty();
hGlPtr = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE,
sizeof(WAVEHDR) + dwLen);
if (!hGlPtr)
return;
lpHdr = (LPWAVEHDR)GlobalLock(hGlPtr);
if (lpHdr)
{
bAlloc = TRUE;
memset((LPVOID)lpHdr, 0, sizeof(WAVEHDR));
lpHdr->lpData = (LPSTR)(lpHdr+1);
lpHdr->dwBufferLength = dwLen;
lpHdr->dwBytesRecorded = (lpBuf) ? dwLen : 0;
if (lpBuf)
memcpy(lpHdr->lpData, lpBuf, dwLen);
else
memset(lpHdr->lpData, 0, dwLen);
}
}
/*****************************************************************************/
/* LPWAVEHDR : returns an LPWAVEHDR */
/*****************************************************************************/
CWaveBuffer::operator LPWAVEHDR()
{
return lpHdr;
}
/*****************************************************************************/
/* Length : returns the buffer's data length */
/*****************************************************************************/
DWORD CWaveBuffer::Length()
{
if (!lpHdr) /* if empty */
return 0; /* return that fact */
if (lpHdr->dwBytesRecorded) /* if something recorded in there */
return lpHdr->dwBytesRecorded; /* return that */
else /* otherwise */
return lpHdr->dwBufferLength; /* return allocated buffer length */
}
/*****************************************************************************/
/* Init : initialize memory */
/*****************************************************************************/
void CWaveBuffer::Init()
{
bAlloc = FALSE;
lpHdr = NULL;
hGlPtr = NULL;
dwStamp = 0;
}
/*****************************************************************************/
/* Empty : empy memory */
/*****************************************************************************/
void CWaveBuffer::Empty()
{
if (bAlloc) /* if self-allocated */
{
GlobalUnlock(hGlPtr); /* free buffer */
GlobalFree(hGlPtr);
}
Init(); /* then re-initialize */
}
/*===========================================================================*/
/* CWaveDevice class members */
/*===========================================================================*/
/*****************************************************************************/
/* CWaveDevice : constructor */
/*****************************************************************************/
CWaveDevice::CWaveDevice()
{
szDevName[0] = 0; /* reset device name */
hEvent = 0; /* no event handle allocated */
pEvtThread = 0; /* no event thread started */
bEvtCancel = FALSE; /* reset event thread cancel flag */
bIsOpen = FALSE; /* reset opened flag */
SetupWaveformat(&wf); /* default to 44.1kHz,16bit,stereo */
}
/*****************************************************************************/
/* SetupWaveformat : initializes a wave format buffer */
/*****************************************************************************/
void CWaveDevice::SetupWaveformat
(
LPWAVEFORMATEX pwf,
DWORD dwSamplesPerSec,
WORD wBitsPerSample,
WORD nChannels
)
{
pwf->wFormatTag = WAVE_FORMAT_PCM;
pwf->nChannels = nChannels;
pwf->nSamplesPerSec = dwSamplesPerSec;
pwf->nAvgBytesPerSec = dwSamplesPerSec * nChannels * wBitsPerSample / 8;
pwf->nBlockAlign = nChannels * wBitsPerSample / 8;
pwf->wBitsPerSample = wBitsPerSample;
pwf->cbSize = 0;
}
/*****************************************************************************/
/* ~CWaveDevice : destructor */
/*****************************************************************************/
CWaveDevice::~CWaveDevice()
{
KillEvt(); /* kill event thread & handle */
}
/*****************************************************************************/
/* CWaveDevice message map */
/*****************************************************************************/
BEGIN_MESSAGE_MAP(CWaveDevice, CWnd)
//{{AFX_MSG_MAP(CWaveDevice)
// NOTE - the ClassWizard will add and remove mapping macros here.
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/*****************************************************************************/
/* Create : creates necessary notification window */
/*****************************************************************************/
BOOL CWaveDevice::Create()
{
if (!CreateEx(0,
AfxRegisterWndClass(0),
"Wave Wnd",
WS_POPUP,
0,
0,
0,
0,
NULL,
NULL))
{
TRACE("Failed to create wave notification window");
return FALSE;
}
return TRUE;
}
/*****************************************************************************/
/* Open : */
/*****************************************************************************/
BOOL CWaveDevice::Open
(
int iID,
LPWAVEFORMATEX pwfx,
DWORD dwCallback,
DWORD dwCallbackInstance,
DWORD fdwOpen
)
{
if ((fdwOpen & CALLBACK_TYPEMASK) == /* if window callback */
CALLBACK_WINDOW)
AssureWnd(); /* make sure window is there */
bIsOpen = TRUE;
return TRUE;
}
BOOL CWaveDevice::Open
(
LPCSTR szName,
LPWAVEFORMATEX pwfx,
DWORD dwCallback,
DWORD dwCallbackInstance,
DWORD fdwOpen
)
{
strcpy(szDevName, szName);
return TRUE;
}
/*****************************************************************************/
/* Close : closes the device */
/*****************************************************************************/
BOOL CWaveDevice::Close ( )
{
KillEvt(); /* kill event thread & handle */
*szDevName = 0;
bIsOpen = FALSE;
return TRUE;
}
/*****************************************************************************/
/* GetSample : retrieves a sample from a buffer using open format */
/*****************************************************************************/
short CWaveDevice::GetSample(CWaveBuffer &buf, int nSample, int nChannel)
{
if (!IsOpen()) /* if not opened */
return 0; /* no sample, sonny... */
if (Channels() < 2) /* if mono */
nChannel = 0; /* reset requested channel # */
if ((nSample < 0) || /* sample must be in range! */
(nSample * BlockAlignment() > (int)buf.Length()))
return 0;
/* position on sample */
LPSTR lpPos = ((LPWAVEHDR)buf)->lpData +
(nSample * BlockAlignment()) +
(nChannel * Bits() / 8);
switch (Bits()) /* process according to sample bits */
{
case 8 : /* 8 bits ? */
return ((short)(*(BYTE *)lpPos) * 256) - (short)32768;
case 16 : /* 16 bits ? */
return *((short *)lpPos);
default : /* anything else ? */
return 0; /* we don't deal with pro values here*/
}
}
/*****************************************************************************/
/* SetSample : puts a sample into a buffer using open format */
/*****************************************************************************/
void CWaveDevice::SetSample
(
CWaveBuffer &buf,
int nSample,
int nChannel,
short sValue
)
{
if ((!IsOpen()) || /* if not opened */
(nChannel >= Channels()) || /* or beyond possible channels */
(nSample < 0) || /* sample must be in range! */
(nSample * BlockAlignment() > (int)buf.Length()))
return; /* no sample, sonny... */
/* position on sample */
LPSTR lpPos = ((LPWAVEHDR)buf)->lpData +
(nSample * BlockAlignment()) +
(nChannel * Bits() / 8);
switch (Bits()) /* process according to sample bits */
{
case 8 : /* 8 bits ? */
*((BYTE *)lpPos) =
(BYTE)((sValue / 256) + 128);
break;
case 16 : /* 16 bits ? */
*((short *)lpPos) = sValue;
break;
default : /* anything else ? */
return; /* we don't deal with pro values here*/
}
}
/*****************************************************************************/
/* EvtThreadProc : event thread procedure */
/*****************************************************************************/
UINT CWaveDevice::EvtThreadProc(LPVOID pParam)
{
UINT result;
CWaveDevice *pDev = (CWaveDevice *)pParam;
while (!pDev->bEvtCancel)
{
result = WaitForSingleObject(pDev->hEvent,INFINITE);
if ((result == WAIT_OBJECT_0) &&
(!pDev->bEvtCancel))
pDev->OnEvent();
else
break;
}
pDev->bEvtCancel = FALSE;
return 0;
}
/*****************************************************************************/
/* StartEvt : creates an event handle & thread */
/*****************************************************************************/
BOOL CWaveDevice::StartEvt()
{
KillEvt(); /* make sure none's there */
/* then create a new event handle */
hEvent = CreateEvent(NULL,FALSE,FALSE,NULL);
if (!hEvent) /* upon error */
return FALSE; /* return error */
/* then create the thread */
pEvtThread = AfxBeginThread(EvtThreadProc, this,
THREAD_PRIORITY_NORMAL, 0,
CREATE_SUSPENDED, NULL);
if (!pEvtThread) /* upon error */
{
KillEvt(); /* kill event handle */
return FALSE; /* and return error */
}
pEvtThread->m_bAutoDelete = TRUE; /* let it go! */
pEvtThread->ResumeThread();
return TRUE;
}
/*****************************************************************************/
/* KillEvt : kills an eventually running event thread or window */
/*****************************************************************************/
void CWaveDevice::KillEvt()
{
if (hEvent) /* if event handle allocated */
{
TRACE0("Killing event thread\n");
if (pEvtThread) /* if thread still running */
{
bEvtCancel = TRUE; /* set cancel flag */
SetEvent(hEvent); /* tell thread to die */
int nLoop = 0;
while (bEvtCancel) /* wait until it does. */
{
TRACE0("Waiting for thread to stop\n");
Sleep(50);
if (++nLoop > 40) /* if 2 seconds have passed, */
{
TRACE0("Timed out waiting for thread to stop!\n");
break;
}
}
pEvtThread = 0; /* and thread handle */
}
CloseHandle(hEvent); /* and close the event handle */
hEvent = 0; /* and reset it... */
}
if (m_hWnd) /* if window handle there, */
DestroyWindow(); /* destroy the window */
}
/*****************************************************************************/
/* BoostPriority : increases the thread's priority */
/*****************************************************************************/
BOOL CWaveDevice::BoostPriority()
{
if (pEvtThread)
{
pEvtThread->SetThreadPriority(THREAD_PRIORITY_ABOVE_NORMAL);
return TRUE;
}
return FALSE;
}
/*===========================================================================*/
/* Class CWaveInDeviceList */
/*===========================================================================*/
/*****************************************************************************/
/* CWaveInDeviceList : constructor */
/*****************************************************************************/
CWaveInDeviceList::CWaveInDeviceList ( )
{
WORD wNumDevices;
int i;
WAVEINCAPS wcap;
wNumDevices = waveInGetNumDevs(); /* get # Wave input devices */
if (wNumDevices)
{
for (i=0; i < (int) wNumDevices; i++)
{
waveInGetDevCaps(i, &wcap, sizeof(wcap));
Add(wcap.szPname);
}
}
}
/*===========================================================================*/
/* Class CWaveInDevice */
/*===========================================================================*/
/*****************************************************************************/
/* CWaveInDevice message map */
/*****************************************************************************/
BEGIN_MESSAGE_MAP(CWaveInDevice, CWaveDevice)
//{{AFX_MSG_MAP(CWaveInDevice)
ON_MESSAGE(MM_WIM_OPEN, OnWimOpen)
ON_MESSAGE(MM_WIM_DATA, OnWimData)
ON_MESSAGE(MM_WIM_CLOSE, OnWimClose)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/*****************************************************************************/
/* CWaveInDevice : constructor */
/*****************************************************************************/
CWaveInDevice::CWaveInDevice ( )
{
hDev = NULL; /* reset device handle */
hGlobal = NULL; /* Wave In buffers */
pGlobal = NULL;
lpGlHdr = NULL;
nAllocated = 0;
nAllocCount = WAVEINHDRS;
nAllocSize = WAVEINBUFSIZE;
bRecording = FALSE; /* reset recording flag */
dwStamp = 0; /* set internal time stamp */
bClosing = FALSE;
}
/*****************************************************************************/
/* ~CWaveInDevice : destructor */
/*****************************************************************************/
CWaveInDevice::~CWaveInDevice ( )
{
if (IsOpen())
Close();
if (lpGlHdr)
delete[] lpGlHdr;
}
/*****************************************************************************/
/* WaveInProc : callback procedure */
/*****************************************************************************/
static void CALLBACK WaveInProc
(
HWAVEIN hMidiIn,
UINT wMsg,
DWORD dwInstance,
DWORD dwParam1,
DWORD dwParam2
)
{
CWaveInDevice * pInDev = (CWaveInDevice *)dwInstance;
switch (wMsg)
{
case WIM_CLOSE :
pInDev->OnWimClose();
break;
case WIM_OPEN :
pInDev->OnWimOpen();
break;
case WIM_DATA :
#if 0
pInDev->OnWimData((LPWAVEHDR)dwParam1);
#else
/* postpone processing since it could*/
/* lead to a deadlock */
pInDev->PostMessage(MM_WIM_DATA, 0, dwParam1);
#endif
break;
}
}
/*****************************************************************************/
/* Open : opens a Wave In Device with its ID */
/*****************************************************************************/
BOOL CWaveInDevice::Open
(
int iID,
LPWAVEFORMATEX pwfx,
DWORD dwCallback,
DWORD dwCallbackInstance,
DWORD fdwOpen
)
{
if (IsOpen()) /* if already open */
Close(); /* close the opened device */
if ((fdwOpen & CALLBACK_TYPEMASK) == /* if window callback */
CALLBACK_WINDOW)
AssureWnd(); /* make sure window is there */
waveInGetDevCaps(iID, /* get device capabilities */
&wCap, sizeof(wCap));
if (!pwfx) /* if no wave format defined */
{
SetupWaveformat(&wf); /* default to 16bit stereo 44.1kHz */
pwfx = &wf;
}
if ((fdwOpen & CALLBACK_TYPEMASK) == /* if function callback */
CALLBACK_FUNCTION)
{
if (dwCallback == WAVEOPENDEFAULT) /* if default value */
dwCallback = (DWORD)WaveInProc; /* set LP1 to procedure */
if (dwCallbackInstance == /* if default value */
WAVEOPENDEFAULT)
dwCallbackInstance = (DWORD)this; /* set LP2 to object */
}
else if ((fdwOpen&CALLBACK_TYPEMASK)== /* if event callback */
CALLBACK_EVENT)
{
if (dwCallback == WAVEOPENDEFAULT) /* if default value */
{
if (!StartEvt()) /* start event thread */
return FALSE; /* upon error terminate */
dwCallback = (DWORD)hEvent; /* set LP1 to event handle */
}
if (dwCallbackInstance == /* if default value */
WAVEOPENDEFAULT)
dwCallbackInstance = /* set LP2 to instance */
(UINT)AfxGetInstanceHandle();
}
/* if thread callback */
else if ((fdwOpen & CALLBACK_TYPEMASK) ==
CALLBACK_THREAD)
{
if (dwCallback == WAVEOPENDEFAULT) /* if default value */
dwCallback = (DWORD) /* set LP1 to current thread */
GetCurrentThread();
if (dwCallbackInstance == /* if default value */
WAVEOPENDEFAULT)
dwCallbackInstance = /* set LP2 to instance */
(UINT)AfxGetInstanceHandle();
}
else
{
if (dwCallback == WAVEOPENDEFAULT) /* if default value */
dwCallback = (UINT)m_hWnd; /* set LP1 to window */
if (dwCallbackInstance == /* if default value */
WAVEOPENDEFAULT)
dwCallbackInstance = /* set LP2 to instance */
(UINT)AfxGetInstanceHandle();
}
WORD wRtn = waveInOpen(&hDev, /* open the device */
iID, /* with the passed ID */
pwfx, dwCallback, dwCallbackInstance, fdwOpen);
if (wRtn) /* if open error */
{
#if defined(_DEBUG) || defined(_DEBUGFILE)
char szTxt[256];
waveInGetErrorText(wRtn, szTxt, sizeof(szTxt));
TRACE2("CWaveInDevice::Open(%d): %s\n", wRtn, szTxt);
#endif
hDev = NULL; /* make sure that handle is reset */
return FALSE;
}
if ((!AllocBuf(nAllocCount, /* allocate Wave Input buffers */
nAllocSize * pwfx->nBlockAlign))
#if 0
|| (!PrepareBuf()) /* and prepare them for usage */
#endif
)
{
Close(); /* upon error close device */
return FALSE; /* and return error */
}
/* call base class */
CWaveDevice::Open(iID, pwfx, dwCallback, dwCallbackInstance, fdwOpen);
if (pwfx != &wf) /* remember wave format called with */
wf = *pwfx;
#if 0
// if you want to have this computing-intensive task running all the time,
// use this method
return Start(); /* start recording */
#else
// if you want to start/stop recording manually to save processing power
// for more important tasks when not recording, use this method
return TRUE;
#endif
}
/*****************************************************************************/
/* Open : opens a device with its name */
/*****************************************************************************/
BOOL CWaveInDevice::Open
(
LPCSTR szName,
LPWAVEFORMATEX pwfx,
DWORD dwCallback,
DWORD dwCallbackInstance,
DWORD fdwOpen
)
{
WORD wNumDevices;
int i;
WORD wRtn;
WAVEINCAPS wcap;
if (IsOpen()) /* if already open */
Close(); /* close the opened device */
if (!szName) /* if no name passed */
szName = szWMapName; /* assume wave mapper */
wNumDevices = waveInGetNumDevs(); /* get # Wave input devices */
if (wNumDevices)
{
for (i=-1; i < (int) wNumDevices; i++)
{
if (i == -1)
lstrcpy(wcap.szPname, szWMapName);
else
wRtn = waveInGetDevCaps(i, &wcap, sizeof(wcap));
if (!lstrcmp(szName, wcap.szPname))
{
if (!Open(i, pwfx, dwCallback, dwCallbackInstance, fdwOpen))
return(FALSE); /* error - return NOT OK */
return CWaveDevice::Open(szName, /* opened - return OK */
pwfx, dwCallback, dwCallbackInstance, fdwOpen);
}
}
}
return(FALSE); /* return NOT OK */
}
/*****************************************************************************/
/* Start : start recording from device */
/*****************************************************************************/
BOOL CWaveInDevice::Start ( )
{
if (!IsOpen() || IsRecording()) /* if no device open or recording */
return FALSE; /* return error */
if ((!PrepareBuf()) || /* start recording from device */
(waveInStart(hDev)))
return FALSE; /* upon error return error */
dwStamp = timeGetTime(); /* set internal time stamp */
bRecording = TRUE; /* set recording flag */
return TRUE;
}
/*****************************************************************************/
/* Stop : stop recording from device */
/*****************************************************************************/
BOOL CWaveInDevice::Stop ( )
{
#if 1
if (!IsOpen() || !IsRecording()) /* if no device open or recording */
return FALSE; /* return error */
#else
if (!IsOpen()) /* if no device open */
return FALSE; /* return error */
if (!IsRecording()) /* if not recording */
{
if (PreparedBuffers()) /* but buffers prepared */
return UnprepareBuf(); /* unprepare buffers */
return FALSE; /* otherwise just return error */
}
#endif
bRecording = FALSE; /* reset recording flag */
Sleep(10); /* allow others to find that out */
waveInStop(hDev); /* stop recording */
Sleep(10); /* allow others to find that out */
dwStamp = 0; /* set internal time stamp */
return TRUE;
}
/*****************************************************************************/
/* PrepareHeader : prepares a header for use in mmsystem */
/*****************************************************************************/
BOOL CWaveInDevice::PrepareHeader(LPWAVEHDR lpHdr)
{
if (!hDev)
return FALSE;
return !waveInPrepareHeader(hDev, lpHdr, sizeof(WAVEHDR));
}
/*****************************************************************************/
/* UnprepareHeader : unprepares a used header */
/*****************************************************************************/
BOOL CWaveInDevice::UnprepareHeader(LPWAVEHDR lpHdr)
{
if (!hDev)
return FALSE;
return !waveInUnprepareHeader(hDev, lpHdr, sizeof(WAVEHDR));
}
/*****************************************************************************/
/* Reset : resets the attached Wave In device */
/*****************************************************************************/
BOOL CWaveInDevice::Reset ( )
{
if (!IsOpen()) /* if no device open */
return FALSE; /* return error */
Stop(); /* make sure recording is stopped */
waveInReset(hDev); /* reset the attached device */
Sleep(10); /* allow others to find out */
int nSleeps = 0; /* simple fuse... */
while (PreparedBuffers()) /* wait until all buffers unprepared */
{
TRACE1("CWaveInDevice::Reset(): waiting for %d buffers to be unprepared\n",
PreparedBuffers());
Sleep(50);
if (++nSleeps > 20) /* wait up to a second */
{
TRACE1("CWaveInDevice::Reset(): ABORTED (%d buffers to be unprepared)\n",
PreparedBuffers());
return FALSE; /* return with error */
}
}
return TRUE; /* and pass back OK */
}
/*****************************************************************************/
/* Close : closes the opened Wave In Device */
/*****************************************************************************/
BOOL CWaveInDevice::Close ( )
{
if (!IsOpen()) /* if no device open */
return FALSE; /* return error */
bClosing = TRUE; /* set flag that we're closing now */
Stop(); /* stop recording from device */
Reset(); /* reset the attached device */
UnprepareBuf(); /* unprepare allocated data */
waveInClose(hDev); /* close the attached device */
hDev = NULL; /* and reset the handle */
bClosing = FALSE;
return CWaveDevice::Close(); /* and pass back OK */
}
/*****************************************************************************/
/* GetPosition : returns the current Wave In position */
/*****************************************************************************/
BOOL CWaveInDevice::GetPosition
(
LPMMTIME pmmt,
UINT cbmmt
)
{
return !waveInGetPosition(hDev, pmmt, cbmmt);
}
/*****************************************************************************/
/* Message : sends a special message to the device */
/*****************************************************************************/
DWORD CWaveInDevice::Message
(
UINT msg,
DWORD dw1,
DWORD dw2
)
{
DWORD rc = 0;
if (hDev)
rc = waveInMessage(hDev, msg, dw1, dw2);
return rc;
}
/*****************************************************************************/
/* AddHeader : adds a Wave Input buffer to the device */
/*****************************************************************************/
BOOL CWaveInDevice::AddHeader
(
LPWAVEHDR lpHdr
)
{
if (lpHdr->dwFlags & WHDR_PREPARED)
#if 1
return TRUE;
#else
UnprepareHeader(lpHdr);
#endif
lpHdr->dwFlags = 0;
//Hdr->dwBufferLength = wf.nAvgBytesPerSec / (2 * nAllocated);
lpHdr->dwBytesRecorded = 0;
if (!PrepareHeader(lpHdr))
return FALSE;
if (waveInAddBuffer(hDev, lpHdr, sizeof(WAVEHDR)))
return FALSE;
return TRUE;
}
/*****************************************************************************/
/* CheckHeader : checks the passed Wave header for validity */
/*****************************************************************************/
BOOL CWaveInDevice::CheckHeader
(
LPWAVEHDR lpHdr
)
{
int i;
if ((IsBadReadPtr(lpHdr, sizeof(WAVEHDR))) ||
(!lpGlHdr))
goto Ouch;
for (i = 0; i < nAllocated; i++) /* if it's one we allocated */
if (lpHdr == lpGlHdr[i])
return TRUE; /* pass back OK */
Ouch:
TRACE0("CWaveInDevice::CheckHeader: invalid header encountered!\n");
return FALSE;
}
/*****************************************************************************/
/* AllocBuf : allocates Wave In buffers */
/*****************************************************************************/
BOOL CWaveInDevice::AllocBuf (int nCount, int nSize)
{
int i; /* loop counter */
FreeBuf(); /* free eventually allocated buffers */
hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE,
nCount * (sizeof(WAVEHDR) + nSize));
if (hGlobal == NULL)
return FALSE;
pGlobal = (char *)GlobalLock(hGlobal); /* lock allocated memory */
if (pGlobal == NULL)
{
GlobalFree(hGlobal);
hGlobal = NULL;
return FALSE;
}
lpGlHdr = new LPWAVEHDR[nCount];
if (!lpGlHdr)
return FALSE;
for (i = 0; i < nCount; i++) /* now generate the wave buffers */
{
lpGlHdr[i] = (LPWAVEHDR)
(pGlobal + i * (sizeof(WAVEHDR) + nSize));
memset(lpGlHdr[i], 0, sizeof(WAVEHDR) + nSize);
lpGlHdr[i]->dwBufferLength = nSize;
lpGlHdr[i]->lpData = (char *)(lpGlHdr[i]+1);
}
nAllocated = nCount;
return TRUE;
}
/*****************************************************************************/
/* FreeBuf : frees allocated Wave In buffers */
/*****************************************************************************/
BOOL CWaveInDevice::FreeBuf ( )
{
int i;
if (!hGlobal) /* if nothing allocated */
return(TRUE); /* pass back OK */
UnprepareBuf(); /* make sure everything's unprepared */
for (i = 0; i < nAllocated; i++) /* otherwise remove the Wave buffers */
lpGlHdr[i] = NULL; /* reset buffer pointer */
pGlobal = NULL; /* reset global buffer pointer */
GlobalUnlock(hGlobal); /* unlock the global buffer */
GlobalFree(hGlobal); /* free it */
hGlobal = NULL; /* and reset the handle */
if (lpGlHdr)
delete[] lpGlHdr;
lpGlHdr = NULL;
nAllocated = 0;
return(TRUE);
}
/*****************************************************************************/
/* PrepareBuf : prepares Wave In buffers */
/*****************************************************************************/
BOOL CWaveInDevice::PrepareBuf ( )
{
int i; /* loop counter */
if ((!hGlobal) || (!pGlobal)) /* if not already allocated */
return FALSE; /* pass back NOT OK */
for (i = 0; i < nAllocated; i++) /* now prepare the Wave buffers */
if (!AddHeader(lpGlHdr[i]))
return FALSE;
return TRUE;
}