123 lines
3.3 KiB
C++
123 lines
3.3 KiB
C++
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/*
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* File: vcmcaps.cpp
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*
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* Base VCM 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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* vcmh323.cpp (H.323/H.245 implementation)
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* 07/28/96 philf added support for video
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*/
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#include "precomp.h"
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//UINT uVidNumLocalFormats =0; // # of active entries in pLocalFormats
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//UINT uVidLocalFormatCapacity=0; // size of pLocalFormats (in multiples of VIDCAP_DETAILS)
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//UINT uVidStaticRef = 0; // global ref count
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//UINT uVidNumCustomDecodeFormats=0; // # of custom entries for decode
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//VIDEO_FORMAT_ID VIDsByRank[MAX_CAPS_PRESORT]; // the best 16 ranked formats, sorted (descending, best first)
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//AUDIO_FORMAT_ID IDsByBandwidth[MAX_CAPS_PRESORT]; // ascending, least BW reqirement first
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//AUDIO_FORMAT_ID IDsByLossTolerance[MAX_CAPS_PRESORT]; // descending, most tolerant first
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//AUDIO_FORMAT_ID IDsByCPULoad[MAX_CAPS_PRESORT]; // ascending, lightest load first
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//#pragma data_seg()
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PVCMFORMATDETAILS pvfd_g;
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static UINT uMaxFormatSize =0;
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PVIDEOFORMATEX lpScratchFormat = NULL;
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BOOL __stdcall VCMFormatEnumCallback(HVCMDRIVERID hvdid, PVCMDRIVERDETAILS pvdd, PVCMFORMATDETAILS pvfd, DWORD_PTR dwInstance);
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CVcmCapability::CVcmCapability()
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:m_dwDeviceID(VIDEO_MAPPER)
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{
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}
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CVcmCapability::~CVcmCapability()
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{
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}
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// FormatEnum() is the root level enumeration of VCM 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 video
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// vcmFormatEnum() calls VCMFormatEnumCallback().
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BOOL CVcmCapability::FormatEnum(CVcmCapability *pCapObject, DWORD dwFlags)
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{
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MMRESULT mResult;
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VCMDRIVERDETAILS vdd;
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VCMFORMATDETAILS vfd;
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if(!GetVideoFormatBuffer())
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return FALSE;
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vdd.dwSize = sizeof(VCMDRIVERDETAILS);
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vfd.cbStruct = sizeof(VCMFORMATDETAILS);
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vfd.pvfx = lpScratchFormat;
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vfd.cbvfx = uMaxFormatSize;
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vfd.szFormat[0]=(WCHAR)0;
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mResult = vcmFormatEnum(m_dwDeviceID, VCMFormatEnumCallback, &vdd, &vfd, (DWORD_PTR)pCapObject,
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dwFlags | VCM_FORMATENUMF_BOTH);
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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 CVcmCapability::FormatEnumHandler(HVCMDRIVERID hvdid,
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PVCMFORMATDETAILS pvfd, VCMDRIVERDETAILS *pvdd, DWORD_PTR dwInstance)
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{
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return FALSE;
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}
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BOOL __stdcall VCMFormatEnumCallback(HVCMDRIVERID hvdid,
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PVCMDRIVERDETAILS pvdd, PVCMFORMATDETAILS pvfd, DWORD_PTR dwInstance)
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{
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CVcmCapability *pCapability = (CVcmCapability *)dwInstance;
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return pCapability->FormatEnumHandler(hvdid, pvfd, pvdd, dwInstance);
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}
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BOOL GetVideoFormatBuffer()
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{
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// Get size of largest VIDEOFORMATEX structure in the system
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MMRESULT mResult;
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if((mResult = vcmMetrics(NULL, VCM_METRIC_MAX_SIZE_FORMAT, (LPVOID) &uMaxFormatSize)) != MMSYSERR_NOERROR)
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{
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ERRORMESSAGE(("GetFormatBuffer: vcmMetrics failed:0x%08lX\r\n",mResult));
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return FALSE;
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}
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if(!(lpScratchFormat = (PVIDEOFORMATEX) MemAlloc(uMaxFormatSize)))
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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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return TRUE;
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}
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