CBaseOutputPin.Deliver 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 Deliver method delivers a media sample to the connected input pin.
Syntax
virtual HRESULT Deliver(
IMediaSample *pSample
);
Parameters
-
pSample
-
Pointer to the sample's IMediaSample interface.
Return value
Returns an HRESULT value. Possible values include those listed in the following table.
| Return code | Description |
|---|---|
|
Success. |
|
Pin is not connected. |
Remarks
This method calls the IMemInputPin::Receive method on the input pin. Receive can block if the IMemInputPin::ReceiveCanBlock method returns S_OK.
Release the sample after calling this method. The input pin might hold a reference count on the sample, so do not reuse the sample. Always call the CBaseOutputPin::GetDeliveryBuffer method to obtain a new sample.
Hold the filter's critical section before calling this method. Otherwise, the pin might get disconnected during the method call. If the filter uses a worker thread to deliver samples, hold the critical section when the filter is ready to deliver a sample. Otherwise, you can hold the critical section in the filter's IMemInputPin::Receive method, where the filter processes samples.
Worker threads can create a potential deadlock. When the thread holds the critical section, it might wait on a state change in the filter. At the same time, the state change might be waiting for the thread to complete. To prevent this, the state-change code should signal an event that terminates the thread, and then wait for the thread to signal completion.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|