IMediaObject::GetStreamCount method (mediaobj.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetStreamCount method retrieves the number of input and output streams.
Syntax
HRESULT GetStreamCount(
[out] DWORD *pcInputStreams,
[out] DWORD *pcOutputStreams
);
Parameters
[out] pcInputStreams
Pointer to a variable that receives the number of input streams. Cannot be NULL.
[out] pcOutputStreams
Pointer to a variable that receives the number of output streams. Cannot be NULL.
Return value
Returns an HRESULT value. Possible values include those in the following table.
| Return code | Description |
|---|---|
|
NULL pointer argument |
|
Success |
Remarks
The DMO might have zero input streams or zero output streams. The number of streams does not change; a DMO cannot dynamically add or remove streams.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | mediaobj.h (include Dmo.h) |
| Library | Dmoguids.lib |