ddgrab.h

在matlab环境下讲视频文件读入

/***************************************************
This is the header file for the Grabber code.  Include this
in your files.

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 "atlbase.h"
#include "dshow.h"
#include "qedit.h"
#include <assert.h>

#ifdef REMOVEMSDLL
	class intListEntry
	{
		public:
		int data;
		intListEntry* next;

		intListEntry()
		{
			next = NULL;
			data = 0;
		};

		intListEntry(int thisData, intListEntry* parent)
		{
			data = thisData;
			next = NULL;
			if (parent)
			{
				while (parent->next)
				{
					parent = parent->next;
				}
				parent->next = this;
			}
		};

		int size()
		{
			intListEntry* entry = this;
			int count = 0;
			while(entry->next)
			{
				count++;
				entry = entry->next;
			}
			return count;
		};

		int at(int index)
		{
			intListEntry* entry = this;
			int count = 0;
			while(entry->next)
			{
				count++;
				entry = entry->next;
				if (index+1 == count)
				{
					return entry->data;
				}
			}
			return 0;
		};
	};
#else
	#include <vector>
	using namespace std;
#endif

// since the Audio and Video CB vectors are public we need to make the CB interface public too
class CSampleGrabberCB : public ISampleGrabberCB
{
public:
	CSampleGrabberCB();
	virtual ~CSampleGrabberCB();

#ifdef REMOVEMSDLL
	intListEntry* frames;
	intListEntry* frameBytes;
	intListEntry* frameNrs;
#else
	vector<BYTE*>* frames;
	vector<int>* frameBytes;
	vector<int>* frameNrs;
#endif

	// use this to get data format information, ie. bit depth, sampling rate...
	BYTE *pbFormat;

	unsigned int frameNr;
	bool disabled;
	bool done;

	int bytesPerWORD;
	int rate;
	double startTime, stopTime;
//	double time;

	// Fake out any COM ref counting
	//
	STDMETHODIMP_(ULONG) AddRef() { return 2; }
	STDMETHODIMP_(ULONG) Release() { return 1; }

	// Fake out any COM QI'ing
	//
	STDMETHODIMP QueryInterface(REFIID riid, void ** ppv);

	// We don't implement this one
	//
	STDMETHODIMP SampleCB( double SampleTime, IMediaSample * pSample ){ return 0; }

	// The sample grabber is calling us back on its deliver thread.
	// This is NOT the main app thread!
	//
	STDMETHODIMP BufferCB( double dblSampleTime, BYTE * pBuffer, long lBufferSize );
};

// this is the main grabber class.  I think the interfaces and names are fairly self explanatory
class DDGrabber
{
public:
#ifdef REMOVEMSDLL
	intListEntry* VideoCBs;
	intListEntry* AudioCBs;
#else
	vector<CSampleGrabberCB*>* VideoCBs;
	vector<CSampleGrabberCB*>* AudioCBs;
#endif
	DDGrabber();

	HRESULT buildGraph(char* filename);
	HRESULT doCapture();
	HRESULT getVideoInfo(unsigned int id, int* width, int* height, int* rate, int* nrFramesCaptured, int* nrFramesTotal);
	HRESULT getAudioInfo(unsigned int id, int* nrChannels, int* rate, int* bits, int* nrFramesCaptured, int* nrFramesTotal);
	void getCaptureInfo(int* nrVideo, int* nrAudio);
	// data must be freed by caller
	HRESULT getVideoFrame(unsigned int id, int frameNr, char** data, int* nrBytes);
	// data must be freed by caller
	HRESULT getAudioFrame(unsigned int id, int frameNr, char** data, int* nrBytes);
	void setFrames(int* frameNrs, int nrFrames);
	void setTime(double startTime, double stopTime);
	void disableVideo();
	void disableAudio();
	void cleanUp(); // must be called at the end, in order to render anything afterward.
private:
	CComPtr<IGraphBuilder> pGraphBuilder;
	bool stopForced;

	void MyFreeMediaType(AM_MEDIA_TYPE& mt);
	PIN_INFO getPinInfo(IPin* pin);
	IPin* getInputPin(IBaseFilter* filt);
	IPin* getOutputPin(IBaseFilter* filt);
	bool isRenderer(IBaseFilter* filt);
	IPin* connectedToInput(IBaseFilter* filt);
	GUID getMajorType(IBaseFilter* filt);
	HRESULT insertCapture(IGraphBuilder* pGraphBuilder, IBaseFilter* pRenderer, AM_MEDIA_TYPE* mt, CSampleGrabberCB** grabberCB);
	HRESULT insertVideoCapture(IGraphBuilder* pGraphBuilder, IBaseFilter* pRenderer);
	HRESULT insertAudioCapture(IGraphBuilder* pGraphBuilder, IBaseFilter* pRenderer);
	HRESULT changeToNull(IGraphBuilder* pGraphBuilder, IBaseFilter* pRenderer);
	HRESULT mangleGraph(IGraphBuilder* pGraphBuilder);
};