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IMiniportAudioSignalProcessing::GetModes method (portcls.h)

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The GetModes method retrieves the audio signal processing modes supported by an audio pin.

Syntax

NTSTATUS GetModes(
  [in]            ULONG Pin,
  [out, optional] GUID  *SignalProcessingModes,
  [in, out]       ULONG *NumSignalProcessingModes
);

Parameters

[in] Pin

The index of the audio pin.

[out, optional] SignalProcessingModes

This parameter is optional. It returns an array of GUIDs that identify the signal processing modes supported by the Pin parameter.

[in, out] NumSignalProcessingModes

When used as an input, it specifies the number of elements that can be written to the buffer that is specified in SignalProcessingModes. When used as an output, it returns the number of elements that were written to the buffer.

Return value

GetModes returns STATUS_SUCCESS if the call was successful. Otherwise, the method returns an appropriate error code.

Remarks

If SignalProcessingModes is NULL, then GetModes writes the number of supported modes to NumSignalProcessingModes and returns STATUS_SUCCESS. This allows callers to query the number of supported modes in order to allocate buffers.

If SignalProcessingModes is not NULL, then GetModes verifies that NumSignalProcessingModes is greater than or equal to the number of supported modes. If it is, then the method writes the supported modes to the SignalProcessingModes buffer, writes the actual number of supported modes to NumSignalProcessingModes, and returns STATUS_SUCCESS.

The following table presents and explains the error messages than can be returned by GetModes.

Error code Description
STATUS_BUFFER_TOO_SMALL The buffer that was set aside for NumSignalProcessingModes is too small.
STATUS_INVALID_PARAMETER The value of the Pin parameter indicates a Pin ID that is >= the number of pin factories on the filter. The pin index is zero-based, so for n pin factories on a filter, the highest index value should be n-1.
STATUS_NOT_SUPPORTED A Pin ID was specified for a pin which does not support signal processing modes. For example, if the Pin ID refers to an audio loopback pin or a bridge pin, then GetModes will return this error code.

Requirements

Requirement Value
Minimum supported client Windows 8.1
Minimum supported server Windows Server 2012 R2
Target Platform Universal
Header portcls.h

See also

IMiniportAudioSignalProcessing