309 lines
9.4 KiB
C++
309 lines
9.4 KiB
C++
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/*
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* File: acmcaps.cpp
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*
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* Base ACM implementation of Microsoft Network Audio capability object.
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*
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* Revision History:
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*
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* 12/20/95 mikev created
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* 06/11/96 mikev separated protocol implementation specifics into
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* msiacaps.cpp (the original proprietary version) and
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* acmh323.cpp (H.323/H.245 implementation)
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*/
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#include "precomp.h"
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LPACMFORMATTAGDETAILS paftd_g;
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ACMDRIVERDETAILS *padd;
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ACMDRIVERDETAILS add;
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static UINT uMaxFormatSize =0;
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LPWAVEFORMATEX lpScratchFormat;
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//Variables imported from msiacaps.cpp.
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//uDefTableEntries is the count of default entries
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//and default_id_table is the table itself
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extern UINT uDefTableEntries;
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extern AUDCAP_DETAILS default_id_table[];
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BOOL __stdcall DriverEnumCallback(HACMDRIVERID hadid,
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DWORD_PTR dwInstance, DWORD fdwSupport);
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BOOL __stdcall ACMFormatTagEnumCallback(HACMDRIVERID hadid,
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LPACMFORMATTAGDETAILS paftd, DWORD_PTR dwInstance, DWORD fdwSupport);
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BOOL __stdcall FormatEnumCallback(HACMDRIVERID hadid,
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LPACMFORMATDETAILS pafd, DWORD_PTR dwInstance, DWORD fdwSupport);
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CAcmCapability::CAcmCapability()
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{
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hAcmDriver = NULL;
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}
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CAcmCapability::~CAcmCapability()
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{
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CloseACMDriver();
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}
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BOOL CAcmCapability::OpenACMDriver(HACMDRIVERID hadid)
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{
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MMRESULT mResult;
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// clear any previous open
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CloseACMDriver();
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// do it
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mResult = acmDriverOpen(&hAcmDriver, hadid, 0);
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if(mResult != MMSYSERR_NOERROR)
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{
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return FALSE;
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}
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return TRUE;
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}
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VOID CAcmCapability:: CloseACMDriver()
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{
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if(hAcmDriver)
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{
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acmDriverClose(hAcmDriver, 0);
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hAcmDriver = NULL;
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}
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}
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//
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// DriverEnum() is the root level enumeration of ACM formats. Each permutation of
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// format tag, bits per sample, and sample rate is considered a unique format
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// and will have a unique registry entry if it is "enabled" for internet audio
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//
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//
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// acmDriverEnum() calls DriverEnumCallback() which calls acmFormatTagEnum()
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// which calls FormatTagEnumCallback() which calls acmFormatEnum() which
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// calls FormatEnumCallback().
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//
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BOOL CAcmCapability::DriverEnum(DWORD_PTR pAppParam)
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{
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MMRESULT mResult;
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if(!GetFormatBuffer())
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{
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return FALSE;
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}
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mResult = acmDriverEnum(DriverEnumCallback, pAppParam, NULL);
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if(lpScratchFormat) {
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MEMFREE(lpScratchFormat);
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lpScratchFormat=NULL;
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}
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if(mResult != MMSYSERR_NOERROR)
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{
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return FALSE;
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}
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return TRUE;
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}
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// default implementation of FormatEnumHandler does nothing
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BOOL CAcmCapability::FormatEnumHandler(HACMDRIVERID hadid,
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LPACMFORMATDETAILS pafd, DWORD_PTR dwInstance, DWORD fdwSupport)
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{
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return FALSE;
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}
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BOOL __stdcall DriverEnumCallback(HACMDRIVERID hadid,
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DWORD_PTR dwInstance, DWORD fdwSupport)
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{
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MMRESULT mResult;
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PACM_APP_PARAM pAppParam = (PACM_APP_PARAM) dwInstance;
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CAcmCapability *pCapObject = pAppParam->pCapObject;
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ACMFORMATTAGDETAILS aftd;
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// not interested unless it's a codec driver
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if(!(fdwSupport & ACMDRIVERDETAILS_SUPPORTF_CODEC))
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return TRUE; // continue enumeration
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add.cbStruct = sizeof(add);
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aftd.cbStruct = sizeof(ACMFORMATTAGDETAILS);
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aftd.dwFormatTagIndex=0;
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aftd.cbFormatSize=0;
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// I do NOT know why, but fdwSupport MUST be initialized to zero before
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// calling acmFormatTagEnum(). (returns MMSYSERR_INVALPARAM otherwise)
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aftd.fdwSupport = 0;
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aftd.dwFormatTag = WAVE_FORMAT_UNKNOWN;
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aftd.szFormatTag[0]=0;
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// now see what formats this driver supports
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mResult = acmDriverDetails(hadid, &add, 0);
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if(mResult != MMSYSERR_NOERROR)
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{
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return TRUE; //error, but continue enumerating
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}
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// set global driver details pointer
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padd = &add;
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// # of formats are in add.cFormatTags;
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DEBUGMSG(ZONE_ACM,("DriverEnumCallback: driver %s has %d formats\r\n",
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add.szShortName, add.cFormatTags));
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aftd.cStandardFormats = add.cFormatTags;
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// open the driver so we can query it for stuff
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//mResult = acmDriverOpen(&had, hadid, 0);
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//if(mResult != MMSYSERR_NOERROR)
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if(!pCapObject->OpenACMDriver(hadid))
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{
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ERRORMESSAGE(("DriverEnumCallback: driver open failed:0x%08lX\r\n",mResult));
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padd = NULL;
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return TRUE; //error, but continue enumerating
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}
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mResult = acmFormatTagEnum(pCapObject->GetDriverHandle(), &aftd, ACMFormatTagEnumCallback, dwInstance, 0);
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if(mResult != MMSYSERR_NOERROR)
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{
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ERRORMESSAGE(("DriverEnumCallback: acmFormatTagEnum failed:0x%08lX\r\n",mResult));
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}
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// cleanup
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pCapObject->CloseACMDriver();
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padd = NULL;
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return TRUE;
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}
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BOOL GetFormatBuffer()
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{
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// get size of largest WAVEFORMATEX structure in the system
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MMRESULT mResult = acmMetrics(NULL, ACM_METRIC_MAX_SIZE_FORMAT,
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(LPVOID) &uMaxFormatSize);
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if(mResult != MMSYSERR_NOERROR)
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{
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ERRORMESSAGE(("GetFormatBuffer: acmMetrics failed:0x%08lX\r\n",mResult));
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return FALSE;
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}
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// workaround bug in some third party codecs: it has been observed that the
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// Voxware RT-24 codec distributed by Netscape CoolTalk corrupts the heap when
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// the codec is enumerated. It writes more data to the WAVEFORMATEX that it
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// indicates when metrics are evaluated. Workaround by allocating twice as much as
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// we think we need.
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lpScratchFormat = (LPWAVEFORMATEX) MEMALLOC(2* uMaxFormatSize);
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if(!lpScratchFormat)
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{
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ERRORMESSAGE(("GetFormatBuffer: allocation failed\r\n"));
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return FALSE;
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}
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ZeroMemory(lpScratchFormat, uMaxFormatSize);
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//Set the size of the extra buffer to maximum possible size...
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lpScratchFormat->cbSize=(WORD)(uMaxFormatSize - sizeof (WAVEFORMATEX));
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return TRUE;
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}
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//
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// Gets format details (all permutations of formats) for a given format tag that
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// the driver supports
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//
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BOOL __stdcall ACMFormatTagEnumCallback(
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HACMDRIVERID hadid,
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LPACMFORMATTAGDETAILS paftd,
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DWORD_PTR dwInstance,
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DWORD fdwSupport)
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{
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PACM_APP_PARAM pAppParam = (PACM_APP_PARAM) dwInstance;
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CAcmCapability *pCapObject = pAppParam->pCapObject;
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MMRESULT mResult;
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ACMFORMATDETAILS afd;
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UINT i;
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//Set this first, so that if we are using a default format, we can help the enumerator
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//narrow the field.
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afd.pwfx = lpScratchFormat;
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// if caller wanted to enum ALL formats go right to it (for adding a format)
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if (((pAppParam->dwFlags && ACMAPP_FORMATENUMHANDLER_MASK) != ACMAPP_FORMATENUMHANDLER_ADD) &&
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(pAppParam->pRegCache)) {
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//Do we care about this particular format?
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//rrf_nFormats is the number of formats we read in the
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//registry.
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if (pAppParam->pRegCache->nFormats) {
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for (i=0;i<pAppParam->pRegCache->nFormats;i++) {
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if (((AUDCAP_DETAILS *)pAppParam->pRegCache->pData[i])->wFormatTag == paftd->dwFormatTag){
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//Add some guesses based on the default information
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break;
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}
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}
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// i is the index of either the found tag (so we care.) or
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// equal to the # of formats in the cache, which means not
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// found, so check the default list.
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if (i==pAppParam->pRegCache->nFormats) {
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//Check the case that some (but not all) of the default formats are missing.
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for (i=0;i<uDefTableEntries;i++) {
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if (paftd->dwFormatTag == default_id_table[i].wFormatTag) {
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break;
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}
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}
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if (i==uDefTableEntries) {
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//We don't care about this format, it's not in the cache, or default list
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return TRUE;
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}
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}
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}
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}
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//We support mono formats
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afd.pwfx->nChannels=1;
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afd.cbStruct = sizeof(afd);
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afd.dwFormatIndex = 0;
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afd.dwFormatTag = paftd->dwFormatTag;
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afd.fdwSupport = 0;
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afd.cbwfx = uMaxFormatSize;
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afd.szFormat[0]=0;
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//afd.dwFormatTag = WAVE_FORMAT_UNKNOWN;
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//lpScratchFormat->wFormatTag = WAVE_FORMAT_UNKNOWN;
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lpScratchFormat->wFormatTag = LOWORD(paftd->dwFormatTag);
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DEBUGMSG(ZONE_ACM,("ACMFormatTagEnumCallback:dwFormatTag 0x%08lX, cbFormatSize 0x%08lX,\r\n",
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paftd->dwFormatTag, paftd->cbFormatSize));
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DEBUGMSG(ZONE_ACM,("ACMFormatTagEnumCallback:cStandardFormats 0x%08lX, szTag %s,\r\n",
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paftd->cStandardFormats, paftd->szFormatTag));
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paftd_g = paftd;
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// just setting the global paftd_g should be fine, but I'd like to rid of it later
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pAppParam->paftd = paftd;
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DEBUGMSG(ZONE_ACM,(""));
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DEBUGMSG(ZONE_ACM,("All %s formats known to ACM", paftd->szFormatTag));
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DEBUGMSG(ZONE_ACM,("====================================="));
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DEBUGMSG(ZONE_ACM,("Tag Channels SampPerSec AvgBytPerSec Block BitsPerSample cbSize szFormat"));
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mResult = acmFormatEnum(pCapObject->GetDriverHandle(), &afd,
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FormatEnumCallback, dwInstance, ACM_FORMATENUMF_WFORMATTAG|ACM_FORMATENUMF_NCHANNELS);
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return TRUE;
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}
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BOOL __stdcall FormatEnumCallback(HACMDRIVERID hadid,
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LPACMFORMATDETAILS pafd, DWORD_PTR dwInstance, DWORD fdwSupport)
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{
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PACM_APP_PARAM pAppParam = (PACM_APP_PARAM) dwInstance;
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CAcmCapability *pCapObject = pAppParam->pCapObject;
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DEBUGMSG(ZONE_ACM,("0x%04x %8d 0x%08lx 0x%010lx 0x%04x 0x%011x 0x%04x %s",
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pafd->pwfx->wFormatTag, pafd->pwfx->nChannels,
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pafd->pwfx->nSamplesPerSec, pafd->pwfx->nAvgBytesPerSec,
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pafd->pwfx->nBlockAlign, pafd->pwfx->wBitsPerSample,
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pafd->pwfx->cbSize, pafd->szFormat));
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return pCapObject->FormatEnumHandler(hadid, pafd, dwInstance, fdwSupport);
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}
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