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 |
---|---|
|
Parameter nChannel is out of range. |
|
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 |