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Directshow, how to set volume?

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Query for a IBasicAudio interface from the graph builder.

m_pGraphBuilder->QueryInterface( IID_IBasicAudio, reinterpret_cast( &m_pBasicAudio ) )

With this interface you can simply change the volume by doing:

m_pBasicAudio->put_Volume( iVolumeRange[dwVolume] );

Careful, put_Volume uses dB in the range of 0 to -10000. You can also set the panning with put_Balance.
Don''t forget to release the interface again.

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