GetMediaType设置Filter输出类型的设置方法

最新推荐文章于 2024-12-27 08:30:00 发布

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最新推荐文章于 2024-12-27 08:30:00 发布

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分类专栏： DirectShow 文章标签： filter video bi

本文链接：https://blog.youkuaiyun.com/lanhai/article/details/677086

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//设置输出的类型及尺寸,只支持输出rgb24 32 565 三种,只显示当前的
HRESULT CFilter::GetMediaType(int iPosition, CMediaType *pMediaType)
{
if(m_pInput->IsConnected() == FALSE)
{
  return E_UNEXPECTED;
}
if(iPosition < 0)
{
  return E_INVALIDARG;
}
if(iPosition > 0)
{
  return VFW_S_NO_MORE_ITEMS;
}

ASSERT (pMediaType) ;
pMediaType->InitMediaType() ;

pMediaType->SetType(&MEDIATYPE_Video) ;
switch(mbmDes.bmBitsPixel)
{
  case 24:
   pMediaType->SetSubtype(&MEDIASUBTYPE_RGB24);
   break;
  case 32:
   pMediaType->SetSubtype(&MEDIASUBTYPE_RGB32);
   break;
  case 16:
   pMediaType->SetSubtype(&MEDIASUBTYPE_RGB565);
  default:
   return VFW_S_NO_MORE_ITEMS;
}
RECT rcDest = {0};
VIDEOINFO *pvi = (VIDEOINFO *) pMediaType->AllocFormatBuffer(sizeof(VIDEOINFO));
ZeroMemory(pvi, sizeof(VIDEOINFO));

pvi->bmiHeader.biCompression = BI_RGB;
pvi->bmiHeader.biBitCount    = mbmDes.bmBitsPixel;
pvi->bmiHeader.biSize       = sizeof(BITMAPINFOHEADER);
pvi->bmiHeader.biWidth      = mbmDes.bmWidth;
pvi->bmiHeader.biHeight     = mbmDes.bmHeight;
pvi->bmiHeader.biPlanes     = 1;

long llBufferSize = (mbmDes.bmWidth * mbmDes.bmBitsPixel + 31) / 32 * 4;
llBufferSize *= abs(mbmDes.bmHeight);

rcDest.right = mbmDes.bmWidth;
rcDest.bottom = mbmDes.bmHeight;

pvi->bmiHeader.biSizeImage = llBufferSize;
//SetRectEmpty(&(pvi->rcSource));
memset(&(pvi->rcSource),0,sizeof(RECT));
pvi->rcSource.right = mBmpInfo.biWidth;
pvi->rcSource.bottom= mBmpInfo.biHeight;
memcpy(&(pvi->rcTarget),&rcDest,sizeof(RECT));
pMediaType->SetFormatType(&FORMAT_VideoInfo);
//pmt->SetTemporalCompression(FALSE);
pMediaType->SetSampleSize(pvi->bmiHeader.biSizeImage);

return NOERROR;
}