IAMDecoderCaps::GetDecoderCaps method (strmif.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetDecoderCaps method queries the decoder for its capabilities.
Syntax
HRESULT GetDecoderCaps(
[in] DWORD dwCapIndex,
[out] DWORD *lpdwCap
);
Parameters
[in] dwCapIndex
Specifies the capability being queried for.
| Constant | Value | Description |
|---|---|---|
| AM_QUERY_DECODER_VMR_SUPPORT | 0x00000001 | Video Mixing Renderer Filter 7 (VMR-7) support |
| AM_QUERY_DECODER_DXVA_1_SUPPORT | 0x00000002 | DirectX Video Acceleration support |
| AM_QUERY_DECODER_DVD_SUPPORT | 0x00000003 | DVD Video support |
| AM_QUERY_DECODER_ATSC_SD_SUPPORT | 0x00000004 | Standard-definition (SD) ATSC video support |
| AM_QUERY_DECODER_ATSC_HD_SUPPORT | 0x00000005 | High-definition (HD) ATSC video support |
| AM_GETDECODERCAP_QUERY_VMR9_SUPPORT | 0x00000006 | Video Mixing Renderer Filter 9 (VMR-9) support |
| AM_GETDECODERCAP_QUERY_EVR_SUPPORT | 0x00000007 | Enhanced Video Renderer (EVR) support. |
[out] lpdwCap
Receives one of the following values.
| Value | Description |
|---|---|
| DECODER_CAP_NOTSUPPORTED | The decoder does not support this capability. |
| DECODER_CAP_SUPPORTED | The decoder supports this capability. |
Return value
If the method succeeds, it returns S_OK. Otherwise it returns an HRESULT error code.
Remarks
The DVD Graph Builder uses this method when it builds a DVD graph. If the decoder does not support the Video Mixing Renderer filter, then the DVD Graph Builder uses the Overlay Mixer filter instead.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | strmif.h (include Dshow.h) |
| Library | Strmiids.lib |