Sub BufferFrameMix( _
   ByVal _bsLineFrom As String, _
   ByVal _pFrameTo As MFFrame, _
   ByRef _plSamplesMix As Integer, _
   ByVal _dblGainFromStartDb As Double, _
   ByVal _dblGainFromEndDb As Double, _
   ByVal _bsChannelsListIn As String, _
   ByVal _bsChannelsListOut As String _
) 

void BufferFrameMix( 
   string _bsLineFrom,
   MFFrame _pFrameTo,
   out int _plSamplesMix,
   double _dblGainFromStartDb,
   double _dblGainFromEndDb,
   string _bsChannelsListIn,
   string _bsChannelsListOut
)

procedure BufferFrameMix( 
    _bsLineFrom: String;
    _pFrameTo: MFFrame;
   Out  _plSamplesMix: Integer;
    _dblGainFromStartDb: Double;
    _dblGainFromEndDb: Double;
    _bsChannelsListIn: String;
    _bsChannelsListOut: String
); 

void BufferFrameMix( 
   BSTR* _bsLineFrom,
   MFFrame* _pFrameTo,
   [PARAMFLAG::Out] int _plSamplesMix,
   double _dblGainFromStartDb,
   double _dblGainFromEndDb,
   BSTR* _bsChannelsListIn,
   BSTR* _bsChannelsListOut
) 

Parameters

_bsLineFrom

buffer's line from which audio will be mixed

_pFrameTo

frame to which mixed audio will be implemented

_plSamplesMix

mixed samples

_dblGainFromStartDb

start gain in dB

_dblGainFromEndDb

end gain in dB

_bsChannelsListIn

input channels' list, for example "0,1,2,3"

_bsChannelsListOut

output channels' list, for example "0,2,1,3"

Reference

IMFAudioBuffer Interface
IMFAudioBuffer Members