capture.h

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// capture.h
// Emmanuel Grolleau (c) 2002
// This file is a part of AviCapTcl
// Describes the class CCapture which uses VFW to implement
// a Tk widget that captures a video or image from a source

// Version 1.0.0.0
// Last modification 01/05/2002

#ifndef _CCAPTURE_H_
#define _CCAPTURE_H_
#include <afxwin.h>
#include <vfw.h>
#include <tk.h>
#include "avifile.h"
#include "avitimer.h"
#define	MAXCAPDRIVERS	10
// maximum drivers list size


typedef VOID (CALLBACK *PROGRESSCALLBACK)(LPSTR , DWORD);
typedef LRESULT (CALLBACK *FRAMECALLBACK)(HWND , LPVIDEOHDR);
typedef LRESULT (CALLBACK *ERRORCALLBACK)(HWND , int , LPCSTR);

#define TCL_CALLBK_NOTCOMPRESSED 0
// The tcl frame callbacks are called with uncompressed data
#define TCL_CALLBK_COMPRESSED 1
// The tcl frame callbacks are called with compressed data
#define TCL_CALLBK_BOTH 2
// The tcl frame callbacks are called with both compressed and uncompressed data

class CCapture {
public:
	static void GetDriversList(CStringArray &Names);
	// Names contains the names of all the drivers
	CCapture(const CString name,Tcl_Interp *interp,BOOL &ok,int w=320,int h=240);
	// Constructor of a capture widget
	// name is yhe tclname
	// ok is true iff no error occurred while creating the window
	~CCapture();
	// Destructor
	LPBITMAPINFO GetBitmapInfo();
	// returns uncompressed bmihdr

	static CCapture *FindFromHwnd(HWND hwnd);

	// Connection & deconnection
	BOOL Connect(int indx);
	//connect by index
	BOOL Disconnect();

	BOOL Preview(int rate);
	// Start/Stop preview: if rate is greater than 0, then starts
	// preview at the specified rate in milliseconds, if rate is 0 then
	// stops preview
	BOOL Overlay(BOOL onoff);
	// Start/Stop overlay

	//Standard AVICap window Dialogs
	BOOL CompressDlg(char fccHandler[4]);
	BOOL DisplayDlg();
	BOOL FormatDlg();
	BOOL VSourceDlg();

	// Capture functions
	BOOL GetCaptureSetup(CAPTUREPARMS *parms);
	BOOL SetCaptureSetup(CAPTUREPARMS *parms);
	BOOL SetCaptureFile(LPSTR pathname);
	BOOL GetCaptureStatus(CAPSTATUS *stat);
	BOOL StartCapture();
	BOOL StartSeq();
	BOOL StopCapture();
	CAVIFile *_avifile;  // current avi file for capture
	long TimeFrame();
	
	// Compression functions
	BOOL BeginCompression();	// Initiates compression
	BOOL EndCompression();	// End compression
	BOOL IsCompressed();	// Returns true if the user selected a compression format other than "not compressed"
	BOOL CompressionStarted();  // Returns true if in context compression
	PCOMPVARS GetCompressor();
	void SetCompressor(PCOMPVARS compvars);
	LPVOID Compress(LPVOID data,long *size,BOOL *isIndex);
	LPVOID DefaultCompressCallbackAction(LPVIDEOHDR lpVHdr); // called in order to compress frame into the avifile

	// Callback functions, the first parameter is the Tcl_Obj containing the tcl function
	// to call on callback, the second is one of TCL_CALLBK_NOTCOMPRESSED
	// TCL_CALLBK_COMPRESSED TCL_CALLBK_BOTH
	BOOL SetTclVideoStreamCallback(Tcl_Obj *o,int compressed);
	BOOL SetTclWaveStreamCallback(Tcl_Obj *o);
	BOOL SetTclYieldCallback(Tcl_Obj *o);
	BOOL SetTclFrameCallback(Tcl_Obj *o,int compressed);
	BOOL SetTclErrorCallback(Tcl_Obj *o);

	void Debug(char * txt);
	// Calls a tcl function called "Debug", giving it txt as argument
protected:
	static LPTOP_LEVEL_EXCEPTION_FILTER _pastExceptionHandler;
	// Exception handling functions
	static void FreeAllDrivers();
	// Called by an exception handler in order to destroy all the Capture objects
	// and to free the drivers
	friend LONG WINAPI exceptionhandler (LPEXCEPTION_POINTERS arg);
	// Exception handler
	friend LRESULT PASCAL TclVideoStreamCallback(HWND hWnd, LPVIDEOHDR lpVHdr);
	friend LRESULT PASCAL TclWaveStreamCallback(HWND hWnd, LPWAVEHDR lpVHdr);
	friend LRESULT CALLBACK TclYieldCallback(HWND hWnd);
	friend LRESULT PASCAL TclFrameCallback(HWND hWnd, LPVIDEOHDR lpVHdr);
	friend LRESULT CALLBACK TclErrorCallback(HWND hWnd,int nID,LPCSTR lpsz);

	BOOL _getBITMAPINFO(); // retrieves the BITMAPINFO associated to capture device

	static CCapture *FindCapture(const CString tclname);
	// Returns the CCapture instance corresponding to tclname
	// null if it does not exist
	static void AddCapture(CCapture* cap);
	// Adds a CCapture instance to the list of instances
	static void RemoveCapture(const CCapture *cap);
	// Removes a CCapture instance from the list of instances
	static class cell {
	// Linked list of all the instances of a CCapture
	public:
		CCapture *cap;
		cell * suiv;
		cell(CCapture *c,cell *s):cap(c),suiv(s) {};
	};
	void _clearAllCb();
	// Removes any callback function
	static cell *_allCaptures;
	// List of all the instances of a CCapture
	static nb_capwindow;
	Tk_Window tkwin;
	void _selfInit();
	BOOL _connected;
	BOOL _preview;
	BOOL _overlay;
	BOOL _compressionstarted;
	LPBITMAPINFO _bmpInfo;
	COMPVARS _compvars;
	CString tclname;
	Tcl_Interp *tclinterp;
	HWND tk_hwnd,capHwnd;
	LPVOID _VideoStreamCb;
	LPVOID _WavStreamCb;
	PROGRESSCALLBACK _YieldCb;
	FRAMECALLBACK _FrameCb;
	LPVOID _ErrorCb;
	AVITimer *_timer;
	// Tcl callback functions
	Tcl_Obj* _tcl_VideoStreamCb;
	int _tcl_VideoStreamCbCompression;
	// 0 for uncompressed frames, 1 for compressed frames,
	// 2 for both compressed and uncompressed frames
	Tcl_Obj* _tcl_WaveStreamCb;
	Tcl_Obj* _tcl_YieldCb;
	Tcl_Obj* _tcl_FrameCb;
	int _tcl_FrameCbCompression;
	Tcl_Obj* _tcl_ErrorCb;
};	

#endif