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Volume Mixer
Mix volume levels on per-app or per-device basis, with some additional features if time permits
John

About Volume Mixer

My intent is to create a Volume Mixer and explore the following topics or answer the following questions:

  • How much of the volume mixer code can be made platform independent?
  • Windows APIs around audio devices, application audio sessions, application icon retrieval.
  • Similar API functionality on other platforms as time permits
  • Can I route applications to specific devices?
  • Create a Microphone Monitor (Audio Input->Output passthrough) if time permits
  • Maybe some visualizations like waveforms or Frequency Bars from whatever apps you want
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John
Volume Mixer

Useful MSDN docs on some operations for default devices and device properties...

MMDeviceEnumerator::GetDefaultAudioEndpoint

https://learn.microsoft.com/en-us/windows/win32/api/mmdeviceapi/nf-mmdeviceapi-immdeviceenumerator-getdefaultaudioendpoint

IMMDevice::Activate

https://learn.microsoft.com/en-us/windows/win32/api/mmdeviceapi/nf-mmdeviceapi-immdevice-activate

IAudioEndpointVolume::SetMasterVolumeLevelScalar

https://learn.microsoft.com/en-us/windows/win32/api/endpointvolume/nf-endpointvolume-iaudioendpointvolume-setmastervolumelevelscalar

IAudioEndpointVolume::GetMasterVolumeLevelScalar

https://learn.microsoft.com/en-us/windows/win32/api/endpointvolume/nf-endpointvolume-iaudioendpointvolume-getmastervolumelevelscalar

IMMDevice::OpenPropertyStore

https://learn.microsoft.com/en-us/windows/win32/api/mmdeviceapi/nf-mmdeviceapi-immdevice-openpropertystore

PropVariantInit

https://learn.microsoft.com/en-us/windows/win32/api/propidl/nf-propidl-propvariantinit

IPropertyStore::GetValue

https://learn.microsoft.com/en-us/windows/win32/api/propsys/nf-propsys-ipropertystore-getvalue

PKEY_Device_FriendlyName

https://learn.microsoft.com/en-us/windows/win32/coreaudio/pkey-device-friendlyname