Trying to control audio gain

Hello,

i am trying to write an app for ATEM Mini.
Thanks to Sample codes i have an idea how to controll transition and input. But I can't find how to controll audio gain. I tried topics here on forum called "Control Audio Mixer Atem" and "ATEM Audio Interface" but they not worked for me.
When i trying to do something like that

Code: Select all

IBMDSwitcherAudioMixer m_audiomixer;
            m_audiomixer = (BMDSwitcherAPI.IBMDSwitcherAudioMixer)switcher;

It showed me error

System.InvalidCastException: 'Unable to cast COM object of type 'System.__ComObject' to interface type 'BMDSwitcherAPI.IBMDSwitcherAudioMixer'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{BCED8CA2-E915-4701-87D4-F68045701E09}' failed due to the following error: Neznámé rozhraní (0x80004002 (E_NOINTERFACE)).'

Can someone help me how to control audio? Or can someone provide me a sample code?

Thanks a lot,

Tomas

[Cameron Nichols]

Hi Tomas,

The ATEM Mini does not implement the older audio mixer (IBMDSwitcherAudioMixer interface). Instead it implements the Fairlight audio mixer (IBMDSwitcherFairlightAudioMixer interface) which is a more advanced and feature-rich audio mixer.

For full compatibility with both mixers, you should implement similar to:

Code: Select all

IBMDSwitcherFairlightAudioMixer m_fairlightAudioMixer;
IBMDSwitcherAudioMixer m_audiomixer;

try
{
    m_fairlightAudioMixer = (IBMDSwitcherFairlightAudioMixer)switcher;
}
catch (InvalidCastException)
{
   m_audiomixer = (IBMDSwitcherAudioMixer)switcher;
}


Then test (eg m_audiomixer != null) to determine which mixer should be used to set audio gain.

Regards
Cameron

Hello Cameron!

Thanks a lot for yout answer!
It helped me a lot!

Tomas.