IWMCodecInfo::GetCodecInfoCount method (wmsdkidl.h)

Article
4/26/2023

[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The GetCodecInfoCount method retrieves the number of supported codecs for a specified major type of digital media (audio or video).

Syntax

HRESULT GetCodecInfoCount(
  [in]  REFGUID guidType,
  [out] DWORD   *pcCodecs
);

Parameters

[in] guidType

GUID identifying the major type of digital media. This must be one of the following constants.

Constant	Description
WMMEDIATYPE_Video	Specifies a video codec.
WMMEDIATYPE_Audio	Specifies an audio codec.

[out] pcCodecs

Pointer to a count of supported codecs.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
E_POINTER	pcCodecs has been passed a null value.
E_INVALIDARG	guidType is not a type for which codecs are used.

Remarks

Use this method along with GetCodecFormatCount and GetCodecFormat to enumerate through the supported codecs for each media type, and the supported formats for each codec.

The Windows Media Format SDK provides codecs only for audio and video. If you specify another major type, this method will return an error.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only],Windows Media Format 7 SDK, or later versions of the SDK
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	wmsdkidl.h (include Wmsdk.h)
Library	Wmvcore.lib; WMStubDRM.lib (if you use DRM)

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