CBaseRenderer.PrepareReceive 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 PrepareReceive method prepares the filter to render a sample.
Syntax
virtual HRESULT PrepareReceive(
IMediaSample *pMediaSample
);
Parameters
-
pMediaSample
-
Pointer to the sample's IMediaSample interface.
Return value
Returns an HRESULT value. Possible values include those in the following table.
| Return code | Description |
|---|---|
|
Success. |
|
Failed. |
|
Unexpected error. |
|
Filter is dropping this sample. |
Remarks
The filter calls this method from inside the CBaseRenderer::Receive method, before it renders a sample. If the filter is running, this method schedules the sample for rendering.
If the filter already has a pending sample, or if the end-of-stream was already reached, the method returns E_UNEXPECTED. Possibly the upstream filter is not serializing its streaming calls correctly.
If the scheduling algorithm determines that the sample should be dropped (see CBaseRenderer::ScheduleSample), the method returns VFW_E_SAMPLE_REJECTED. However, the input pin's IMemInputPin::Receive method does not pass this error code to the upstream filter, because dropping a sample is not an error.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|
See also
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