IMediaSample::GetMediaType method (strmif.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The GetMediaType method retrieves the media type, if the media type differs from the previous sample.
Syntax
HRESULT GetMediaType(
AM_MEDIA_TYPE **ppMediaType
);
Parameters
ppMediaType
Address of a variable that receives a pointer to an AM_MEDIA_TYPE structure. If the media type has not changed from the previous sample, *ppMediaType is set to NULL.
Return value
Returns an HRESULT value. Possible values include those shown in the following table.
| Return code | Description |
|---|---|
|
The media type has not changed from the previous sample. |
|
Success. |
|
Insufficient memory. |
Remarks
This method enables a filter to make limited changes to the media type, such as changing the palette. To make a significant change to the media type, the pins might need to reconnect and renegotiate the media type.
If the method returns S_OK, the caller must free the memory for the media type, including the format block. You can use the DeleteMediaType function in the DirectShow base class library.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | strmif.h (include Dshow.h) |
| Library | Strmiids.lib |