/***************************************************
This?is?the?main?Grabber?code.??It?builds?the?Direct?Show?graphs?
and?then?inserts?SampleGrabbers?right?before?the?renderers.??It?
then?changes?all?of?the?renderers?to?NullRenderers.??This?code?
supports?any?number?of?audio?or?video?streams.??Raw?midi?streams
are?not?supported?--?I?didn‘t?think?I?should?bother.

This?code?was?intended?to?be?used?inside?of?a?matlab?interface
but?can?be?used?as?a?generic?grabber?class?for?anyone?who?needs?
one.

Written?by?Micah?Richert.
07/14/2005
**************************************************/

#include?“DDGrab.h“

GUID?NULLGUID?=?{0};

CSampleGrabberCB::CSampleGrabberCB（）
{
	pbFormat?=?NULL;
	frameNr?=?0;
	disabled?=?FALSE;
}

CSampleGrabberCB::~CSampleGrabberCB（）
{
	if?（pbFormat）?free（pbFormat）;
	for?（int?f=0;fames.size（）;f++）?if?（frames[f]）?free（frames[f]）;
}

//?Fake?out?any?COM?QI‘ing
//
STDMETHODIMP?CSampleGrabberCB::QueryInterface（REFIID?riid?void?**?ppv）
{
	if?（!ppv）?return?E_POINTER;
	
	if（?riid?==?IID_ISampleGrabberCB?||?riid?==?IID_IUnknown?）?
	{
		*ppv?=?（void?*）?static_cast?（?this?）;
		return?NOERROR;
	}	

	return?E_NOINTERFACE;
}

//?The?sample?grabber?is?calling?us?back?on?its?deliver?thread.
//?This?is?NOT?the?main?app?thread!
//
STDMETHODIMP?CSampleGrabberCB::BufferCB（?double?dblSampleTime?BYTE?*?pBuffer?long?lBufferSize?）
{
	if?（disabled）?return?0;

	if?（!pBuffer）?return?E_POINTER;

	frameNr++;

	bool?foundNr?=?false;
	for?（int?i=0;iameNrs.size（）;i++）?if?（frameNrs[i]?==?frameNr）?foundNr?=?true;

	if?（frameNrs.size（）?==?0?||?foundNr）
	{
		BYTE*?tmp?=?new?BYTE[lBufferSize];
		if?（!tmp）?return?E_OUTOFMEMORY;

		memcpy（tmppBufferlBufferSize）;
		frames.push_back（tmp）;
		frameBytes.push_back（lBufferSize）;
	}

	return?0;
}

void?DDGrabber::cleanUp（）
{
	IEnumFilters*?filterList;
	IbaseFilter*?filt;
	ULONG?tmp;
	int?i;

	for?（i=0;?i	for?（i=0;?i
	VideoCBs.clear（）;
	AudioCBs.clear（）;

	if?（!FAILED（pGraphBuilder->EnumFilters（&filterList）））
	{
		filterList->Reset（）;
		while?（filterList->Next（1?&filt?&tmp）?==?S_OK）
		{
			filt->Release（）;
		}	
		filterList->Release（）;
	}
	pGraphBuilder?=?NULL;
}

void?DDGrabber::MyFreeMediaType（AM_MEDIA_TYPE&?mt）
{
	if?（mt.cbFormat?!=?0）
	{
		CoTaskMemFree（（PVOID）mt.pbFormat）;
		mt.cbFormat?=?0;
		mt.pbFormat?=?NULL;
	}
	if?（mt.pUnk?!=?NULL）
	{
		//?Unecessary?because?pUnk?should?not?be?used?but?safest.
		mt.pUnk->Release（）;
		mt.pUnk?=?NULL;
	}
}

PIN_INFO?DDGrabber::getPinInfo（IPin*?pin）
{
	PIN_INFO	info?=?{0};

	if?（pin）
	{
		if?（!FAILED（pin->QueryPinInfo（&info）））
		{
			info.pFilter->Release（）;
		}
	}

	return?info;
}

IPin*?DDGrabber::getInputPin（IbaseFilter*?filt）
{
	IPin*?pin?=?NULL;
	IEnumPins*?pinList;
	ULONG?tmp;
	
	if?（!filt）?return?NULL;

	//get?the?input

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????目錄??????????0??2006-05-20?16:51??matlab視頻讀取

?????文件??????15457??2005-07-14?18:01??matlab視頻讀取\DDGrab.cpp

?????文件???????3205??2005-07-14?17:50??matlab視頻讀取\DDGrab.h

?????文件???????4280??2005-07-14?18:35??matlab視頻讀取\makedll.m

?????文件???????6511??2005-07-14?17:08??matlab視頻讀取\mexDDGrab.cpp

?????文件??????36864??2005-07-14?18:41??matlab視頻讀取\mexDDGrab.dll

?????文件???????5050??2005-07-27?14:05??matlab視頻讀取\mmread.m

-----------?---------??----------?-----??----

????????????????71585????????????????????8