How to get video data in directshow?

Huthek

I want to write a transform filter, one of his input pins receives video data, and I perform image processing on these videos frame by frame (such as denoising), and then send it through the output pin

I intend to improve on the nullnull (minimal null filter) example in ds, may I ask:

How to get frame-by-frame video data and determine what format it is for processing?

Thank you! !! !!

underworld

As far as the nullnull example is concerned:

You can decide what type of data input your filter accepts in CheckInputType, for example:

HRESULT CheckInputType(const CMediaType* mtIn)
{
if (mtIn->subtype == MEDIASUBTYPE_RGB565)
return S_OK;
return E_FAIL;
}

Only RGB565 type data input is accepted. In addition, there is a member m_mt on the input pin, which is used to save the media type for connection, you can refer to it.

The video image frame is passed to the Transform function when the filter graph is running.