m2decdll.cpp

mpeg2编码解码源程序代码

// m2decdll.cpp : Defines the initialization routines for the DLL.
//



#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#include "config.h"
#include "global.h"
#include "io.h"
#include "math.h"

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <fcntl.h>
#include "io.h"
#include "windowsx.h"
#include  <math.h>


static AFX_EXTENSION_MODULE M2decdllDLL = { NULL, NULL };

extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
	// Remove this if you use lpReserved
	UNREFERENCED_PARAMETER(lpReserved);
	if (dwReason == DLL_PROCESS_ATTACH)
	{
		TRACE0("M2DECDLL.DLL Initializing!\n");
		
		// Extension DLL one-time initialization
		if (!AfxInitExtensionModule(M2decdllDLL, hInstance))
			return 0;

		// Insert this DLL into the resource chain
		// NOTE: If this Extension DLL is being implicitly linked to by
		//  an MFC Regular DLL (such as an ActiveX Control)
		//  instead of an MFC application, then you will want to
		//  remove this line from DllMain and put it in a separate
		//  function exported from this Extension DLL.  The Regular DLL
		//  that uses this Extension DLL should then explicitly call that
		//  function to initialize this Extension DLL.  Otherwise,
		//  the CDynLinkLibrary object will not be attached to the
		//  Regular DLL's resource chain, and serious problems will
		//  result.

		new CDynLinkLibrary(M2decdllDLL);
	}
	else if (dwReason == DLL_PROCESS_DETACH)
	{
		TRACE0("M2DECDLL.DLL Terminating!\n");
		// Terminate the library before destructors are called
		AfxTermExtensionModule(M2decdllDLL);
	}

	return 1;   // ok
}

extern "C"  HANDLE WINAPI OpenMpeg(char* infile,void *Cal)
{

//	::MessageBox(NULL,NULL,"OpenMpeg1",MB_OK);
	HANDLE filehandle=OpenMpeg2(infile, NULL);
	return filehandle;
   
}

extern "C"  BOOL WINAPI GetHeader(HANDLE filehandle, header_data *head)
{
//	::MessageBox(NULL,NULL,"GetHeader",MB_OK);

   long total;
   char temp[16];
   total=head->totalframe;
   memset(head,1,sizeof(header_data));

//   if()
   if(!filehandle)
   {
	   head->totalframe=0;
	   return false;
   }

    OK_ID=false;
	  
    memset(temp,0,16);
    lseek(ld->Infile,-16l,SEEK_END);
	 read(ld->Infile,temp,16);
	 int i=0;
	 while(1)
	 {
		   if((temp[i]=='0')&&(temp[i+1]=='0')&&(temp[i+2]=='o')&&(temp[i+3]=='k'))
		   {
			   break;
		   }
		   if(i>8)
			   break;
		   i++;
	  }
	   if(i>8)
	   {
		   OK_ID=false;
		  
	   }
	   else
	   {
		   OK_ID=true;
	   }

	lseek(ld->Infile,0l,SEEK_SET);
  
   GetHeader1(filehandle);
  
   
 
  
  GetTotal(filehandle,&total);
  TotalFrame=total;
 
 
   
   head->headsize=sizeof(header_data);
   head->totalframe=total;
   head->aspect_ratio_information=aspect_ratio_information;
   head->bit_rate=bit_rate;
   head->chroma_format=chroma_format;
   head->color_primaries=color_primaries;
   head->display_horizontal_size=display_horizontal_size;
   head->display_vertical_size=display_vertical_size;
   head->frame_rate=frame_rate;
   if(fabs(factor-1.000)>0.001)
     head->horizontal_size=WIDTHBYTES((int)((double)horizontal_size*factor))*8;
    else
     head->horizontal_size=horizontal_size;
   head->matrix_coefficients=matrix_coefficients;
   head->mb_height=mb_height;
   head->mb_width=mb_width;
   head->transfer_characteristics=transfer_characteristics;
   head->vertical_size=vertical_size;
   head->video_format=video_format; 
   return true;
}


extern "C"  short WINAPI  MpegDecode(HANDLE filehandle,long frameno,long framenum,short Mode,unsigned char* dst,long stride)
{
//	::MessageBox(NULL,NULL,"MpegDecode",MB_OK);
	if(!filehandle)
       return 0; 



	short num=DecodeMpeg2(filehandle,dst,framenum,frameno+1,Mode,stride);

	return num;
}
extern "C"  void  WINAPI CloseMpeg(HANDLE filehandle)
{
//	::MessageBox(NULL,NULL,"CloseMpeg",MB_OK);
    CloseMpeg2(filehandle);
   
}