C++ AVFrame转BMP 或者其他形式转化也可

void CffmpegUIDlg::SaveAsBMP(AVFrame *pFrameRGB, int width, int height, int index, int bpp)
{
    BITMAPFILEHEADER bmpheader;
    BITMAPINFOHEADER bmpinfo;

    bmpheader.bfType = 0x4d42;
    bmpheader.bfReserved1 = 0;
    bmpheader.bfReserved2 = 0;
    bmpheader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
    bmpheader.bfSize = bmpheader.bfOffBits + width*height*bpp / 8;

    bmpinfo.biSize = sizeof(BITMAPINFOHEADER);
    bmpinfo.biWidth = width;
    bmpinfo.biHeight = height;
    bmpinfo.biPlanes = 1;
    bmpinfo.biBitCount = bpp;
    bmpinfo.biCompression = BI_RGB;
    bmpinfo.biSizeImage = (width*bpp + 31) / 32 * 4 * height;
    bmpinfo.biXPelsPerMeter = 100;
    bmpinfo.biYPelsPerMeter = 100;
    bmpinfo.biClrUsed = 0;
    bmpinfo.biClrImportant = 0;


    DWORD dwInfoSize = width*height*bpp / 8;
    HGLOBAL hGlobal = GlobalAlloc( GMEM_MOVEABLE, sizeof(bmpheader) + sizeof(bmpinfo) + dwInfoSize);
    BYTE *pvData = (BYTE*)GlobalLock( hGlobal );
    memcpy(pvData, &bmpheader, sizeof(bmpheader));
    memcpy(pvData + sizeof(bmpheader), &bmpinfo, sizeof(bmpinfo));
    memcpy(pvData + sizeof(bmpheader) + sizeof(bmpinfo), pFrameRGB->data[0], dwInfoSize);
    GlobalUnlock( hGlobal );

    Gdiplus::Graphics graphics(hdcClient);
    IStream *pStream = NULL;
    HRESULT hr = CreateStreamOnHGlobal( hGlobal,  TRUE,  &pStream );
    Gdiplus::Bitmap bmp(pStream);
    graphics.DrawImage(&bmp, 0, 0);
    GlobalFree( hGlobal ); // 使用Bitmap完后，需要释放资源，以免造成内存泄漏。
}