CTransformFilter.Receive method
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 Receive method receives a media sample, processes it, and delivers an output sample to the downstream filter.
Syntax
HRESULT Receive(
IMediaSample *pSample
);
Parameters
-
pSample
-
Pointer to the IMediaSample interface on the input sample.
Return value
Returns an HRESULT value. Possible values include the following:
| Return code | Description |
|---|---|
|
The upstream filter should stop sending samples. |
|
Success. |
Remarks
The filter's input pin calls this method when it receives a sample. This method calls the CTransformFilter::InitializeOutputSample method, which prepares a new output sample. Then it calls the CTransformFilter::Transform method, which the derived class must implement. The Transform method processes the input data and produces output data.
If the Transform method returns S_FALSE, the Receive method drops this sample. On the first dropped sample, the filter sends an EC_QUALITY_CHANGE event to the filter graph manager. Otherwise, if the Transform method returns S_OK, the filter delivers the output sample. To do so, it calls the IMemInputPin::Receive method on the downstream input pin.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|