About media type of SOurce filter

Question

Hi All,

I am adding a source filter using addsourcefilter api wherein i am providing the path of teh file which happens to be an AMR file. How do i get to know what media type the output pin of this source filter is ...

do i have an API or do i have to set it ...

I need the MAJOR type to be AUDIO and minor type to be _AMR

Regards,

Burrrough

Answer 1

You have two ways to handle this :

1) register a custom file type ( see : http://msdn2.microsoft.com/en-us/library/ms787558.aspx ) so that the file source can determine the correct media type from the extension and/or patterns in the content of the file.

2) an easier way is to explicitely create the file source filter (cocreate), add it to the graph, and use the IFileSource interface::Load  method to specify the filename and the media type :

HRESULT Load(
  LPCOLESTR pszFileName,
  const AM_MEDIA_TYPE *pmt
);

The you just do ICaptureGraphBuilder2.renderstream with the filter as a source.

Answer 2

Thanx a lot for that reply..

I understand that the after the load i will be succesfully creating the source filter with Major type as AUDIO and minor type as AMR..

I have my own transform filter written (output of major type AUDIO and minor type PCM) ,so i do a cocreat and add it ot the graph and connnect.(please correct me if i am wrong here)

I was just wondering whats the best option i have to render after the above manual connection fo the filter...

I mean what do i use to render ???

 

 

Regards

Answer 3

After connecting your source to your transform, the easiest solution is to do

ICaptureGraphBuilder2->RenderStream with your  transform as the source, leaving compressor and renderer Null.

You could also add a default audio renderer and connect it manually.

Rgds,