IAMVideoAccelerator::QueryRenderStatus method (videoacc.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 QueryRenderStatus method queries the read/write status of a DirectX Video Acceleration (DXVA) decoding surface.
Syntax
HRESULT QueryRenderStatus(
[in] DWORD dwTypeIndex,
[in] DWORD dwBufferIndex,
[in] DWORD dwFlags
);
Parameters
[in] dwTypeIndex
Specifies the type of surface to query:
- For a compressed surface, specify one of the DXVA surface types defined in dxva.h.
- For an uncompressed output surface, set this parameter to 0xFFFFFFFF.
[in] dwBufferIndex
The zero-based index of the surface, within the pool of surfaces that were allocated for the specified surface type.
[in] dwFlags
Specifies the type of query to perform.
| Value | Meaning |
|---|---|
|
Test whether the surface is safe to use for writing. |
|
Test whether the surface is safe to use for reading. |
Return value
Returns an HRESULT value. Possible values include the following:
| Return code | Description |
|---|---|
|
The operation is still in progress. |
|
The operation is complete. |
|
The decoder did not use a DXVA decoding type when it connected to the video renderer. |
|
The pins on the decoder and video renderer filters are not connected. |
Remarks
If the filter's pins are not connected, the method returns VFW_E_NOT_CONNECTED.
Requirements
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | videoacc.h |
| Library | Strmiids.lib |