IPerChannelDbLevel::GetLevel method (devicetopology.h)

The GetLevel method gets the volume level, in decibels, of the specified channel.

Syntax

HRESULT GetLevel(
  [in]  UINT  nChannel,
  [out] float *pfLevelDB
);

Parameters

[in] nChannel

The channel number. If the audio stream has N channels, the channels are numbered from 0 to N– 1. To get the number of channels in the stream, call the IPerChannelDbLevel::GetChannelCount method.

[out] pfLevelDB

Pointer to a float variable into which the method writes the volume level, in decibels, of the specified channel.

Return value

If the method succeeds, it returns S_OK. If it fails, possible return codes include, but are not limited to, the values shown in the following table.

Return code	Description
E_INVALIDARG	Parameter nChannel is out of range.
E_POINTER	Pointer pfLevelDB is NULL.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	devicetopology.h

See also

IPerChannelDbLevel Interface

IPerChannelDbLevel::GetChannelCount