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IAudioProcessingObject::IsOutputFormatSupported method (audioenginebaseapo.h)

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The IsOutputFormatSupported method is used to verify that a specific output format is supported.

Syntax

HRESULT IsOutputFormatSupported(
  [in, optional]  IAudioMediaType *pOppositeFormat,
  [in, optional]  IAudioMediaType *pRequestedOutputFormat,
  [out, optional] IAudioMediaType **ppSupportedOutputFormat
);

Parameters

[in, optional] pOppositeFormat

A pointer to an IAudioMediaType interface. This parameter indicates the output format. This parameter must be set to NULL to indicate that the output format can be any type.

[in, optional] pRequestedOutputFormat

A pointer to an IAudioMediaType interface. This parameter indicates the output format that is to be verified.

[out, optional] ppSupportedOutputFormat

This parameter indicates the supported output format that is closest to the format to be verified.

Return value

If the call completes successfully, the ppSupportedOutputFormat parameter returns a pRequestedOutputFormat pointer and the IsOutputFormatSupported method returns a value of S_OK. Otherwise, this method returns one of the following error codes:

Return code Description
S_FALSE
 The format of Input/output format pair is not supported. The ppSupportedOutPutFormat parameter returns a suggested new format.
APOERR_FORMAT_NOT_SUPPORTED
 The format is not supported. The value of ppSupportedOutputFormat does not change.
E_POINTER
 An invalid pointer was passed to the function. The value of ppSupportedOutputFormat does not change.
Other HRESULT values
 These additional error conditions are tracked by the audio engine.

Remarks

There are differences in the implementation of the IsOutputFormatSupported method by the different APOs. For example, with certain implementations, the output can only be of type float when the input format is of type integer.

Requirements

Requirement Value
Minimum supported client Available with Windows Vista and later versions of the Windows operating system.
Target Platform Universal
Header audioenginebaseapo.h
Library Audioenginebaseapo.idl
IRQL All Levels

See also

IAudioMediaType

IAudioProcessingObject