MixerDLL

Change program volumes separately.

WASAPI Audio Mixer Simplification DLL for Volume Management of Sessions

What is MixerDLL?

It is kind of a wrapper-dll, enabling the use of WASAPIs Session Volume Management without digging into it too deep. It was created when we were building a hardware-mixer like the windows audio mixer that could change the volumes of sessions (different programs) separately. For fast testing we wanted to do it via Python, but could not find a way to access the sessions' volume. So I went through Microsofts Documentation and this is what came out of the effort: Some messy code, hopefully working without any memory leaks. But I think someone else could use it - I want to share it with you.

Implemented functionality

I hope this is quite self-explaining. If not, you might want to take a look at the python examples.

• char * version();

• void initAudio();

• void exitAudio();

• char * getErrorMessage();

• int getSessionCount();

• DWORD getSessionPID(const int sessionId);

• char * getSessionName(const int sessionId);

• char * getSessionTitle(const int sessionId);

• char * getPIDName (DWORD);

• char * getPIDTitle (DWORD);

• bool setSessionMute(const int sessionId, const bool mute);

• bool getSessionMute(const int sessionId);

• bool setMasterMute(const bool mute);

• bool getMasterMute();

• bool setSessionVolume(const int sessionId, const float volume);

• float getSessionVolume(const int sessionId);

• bool setMasterVolume(const float volume);

• float getMasterVolume();

• void printAudioInfo();

Using MixerDLL

If you want to use MixerDLL - just do it :) It's unlicensed. Leave me a note if you find it useful.