已经获取到一帧图像数据，怎样用vfw将其解码为位图

Question

现在从摄像头接收到了一帧h.264数据 存储在了缓存 p 中，现在我想使用vfw将p中存储的内容解码为bmp，应该怎样做？

Answer 1

BITMAPINFO     bminfoOrigin;     //压缩前图片的BITMAPINFO结构        
BITMAPINFO     bminfoCode;         //压缩后图片的BITMAPINFO结构        
 
//     填压缩前图片的BITMAPINFO结构        
ZeroMemory(&bminfoOrigin,     sizeof(BITMAPINFO));    
 
bminfoOrigin.bmiHeader.biSize     =     sizeof(BITMAPINFOHEADER);    
bminfoOrigin.bmiHeader.biCompression     =     BI_RGB;    
bminfoOrigin.bmiHeader.biWidth     =     518;    
bminfoOrigin.bmiHeader.biHeight     =     405;    
bminfoOrigin.bmiHeader.biPlanes     =     1;    
bminfoOrigin.bmiHeader.biBitCount     =     24;    
bminfoOrigin.bmiHeader.biSizeImage     =     0;         //518*405*3;    
 
bminfoOrigin.bmiHeader.biXPelsPerMeter     =     0;    
bminfoOrigin.bmiHeader.biYPelsPerMeter     =     0;    
bminfoOrigin.bmiHeader.biClrUsed     =     0;    
bminfoOrigin.bmiHeader.biClrImportant     =     0;    
 
ZeroMemory(&bminfoCode,     sizeof(BITMAPINFO));    
 
BOOL     bKeyFrame;    
COMPVARS     m_CV;    
 
//初始化     COMPVARS    
memset(&m_CV,0,sizeof(COMPVARS));    
m_CV.cbSize     =     sizeof(m_CV);    
m_CV.dwFlags     =ICMF_COMPVARS_VALID;    
m_CV.fccType     =ICTYPE_VIDEO;    
m_CV.cbState     =0;    
m_CV.fccHandler     =mmioFOURCC( 'd ', 'i ', 'v ', 'x ');    
m_CV.lpbiOut     =0;    
m_CV.lKey=1;    
m_CV.lDataRate     =6;    
m_CV.lQ     =ICQUALITY_HIGH;    
 
DWORD     fcchandler=m_CV.fccHandler;    
 
//     编码压缩                            
m_CV.hic     =     ICOpen(ICTYPE_VIDEO,fcchandler,ICMODE_COMPRESS);        
 
if(!(m_CV.hic))    
{    
AfxMessageBox( "ICOpen     Enc     Error! ");    
}    
 
  //         -----------------     单帧压缩ICCompress     -------------------------    
LONG     msize=518*405*3;    
char     *lpout     =new     char[msize];     //输出缓冲    
memset(lpout,0,sizeof(lpout));    
DWORD     dwCKID=0;    
DWORD     dFlags=AVIIF_KEYFRAME;    
 
ICCompressGetFormat(m_CV.hic     ,&bminfoOrigin,&bminfoCode);    
 
DWORD     dwSize     =     ICCompressGetFormatSize(m_CV.hic,     &bminfoOrigin);    
 
//ICSendMessage(m_CV.hic     ,     0x60c9,     0xf7329ace,     0xacdeaea2);    
if(ICCompressBegin(m_CV.hic,&bminfoOrigin,&bminfoCode)!=ICERR_OK)//此处即出错    
                      AfxMessageBox( "ICCompressBegin     Enc     Error! ");    
if(ICCompress(m_CV.hic     ,0,&bminfoCode.bmiHeader     ,    
                      lpout,&bminfoOrigin.bmiHeader     ,    
                      m_pData,0,&dFlags,0,0,0,NULL,NULL)!=ICERR_OK)    
                      AfxMessageBox( "ICCompress     Error! ");            
ICCompressEnd(m_CV.hic);    
ICClose(m_CV.hic);    
 
//解码    
HIC     dehic;    
 
dehic=ICOpen(ICTYPE_VIDEO,fcchandler,ICMODE_DECOMPRESS);    
if(dehic==NULL)    
                      AfxMessageBox( "ICOpen     decompressor     error ");    
static     BYTE     Buf[518*405*10];    
memset(Buf,0,sizeof(Buf));    
ICDecompressGetFormat(dehic     ,&bminfoCode,&bminfoOrigin);    
if(ICDecompressBegin(dehic     ,     &bminfoCode,     &bminfoOrigin)!=ICERR_OK)    
                      AfxMessageBox( "ICDecompressBegin     Error! ");    
if(ICDecompress(dehic     ,0,    
          &(bminfoCode.bmiHeader     ),lpout,&(bminfoOrigin.bmiHeader     ),Buf)!=ICERR_OK)    
                      AfxMessageBox( "ICDecompress     Error! ");    
ICDecompressEnd(dehic);    
ICClose(dehic);    
 
CDC*     pDC     =     GetDC();    
HDC     hDC=pDC-> GetSafeHdc     ();    
::SetDIBitsToDevice(hDC,        
                      0,     0,     bminfoOrigin.bmiHeader.biWidth,     bminfoOrigin.bmiHeader.biHeight,    
                      0,     0,     0,     bminfoOrigin.bmiHeader.biHeight,    
                      Buf,     &bminfoOrigin,     DIB_RGB_COLORS);