To get the spectrum data, you can attach an FFT DSP to the channel the sound is playing on, and retrieve the spectrum data from it. You might also run into some audio crackling, which is caused by drifting between the drivers of the audio device and FMOD - the record example shows how to dynamically adjust the playback speed to compensate for the drift while keeping the same latency. In the Core API example previous mentioned by Jeff, the record_enumeration example demonstrates swapping between different audio devices, though in your case you may simply want to enumerate the devices and find the specific loopback device you want to use. Result = (sound, mcg, false, out channel) play the FMOD Sound (in this case, on the master channel group) Result = ("", _NORMAL |, ref exinfo, out sound) and start recording from the device into that sound create a new FMOD Sound using the extended sound info, Length = (uint)(nativeRate * sizeof(short) * nativeChannels) create extended sound info object using retrieved rate and channel infoįMOD.CREATESOUNDEXINFO exinfo = new FMOD.CREATESOUNDEXINFOĬbsize = MarshalHelper.SizeOf(typeof(FMOD.CREATESOUNDEXINFO)), Result = (deviceIndex, out _, 0, out _, out nativeRate, out _, out nativeChannels, out _) Int deviceIndex = 0 // arbitrary index, pick whichever one corresponds to the device you want grab the rate and channel info of the loopback audio device Record from the loopback device into the FMOD SoundĪ very basic implementation in Unity might look something like this: void Start().Create an FMOD Sound using the retrieved info.Grab the rate and channel info of the loopback audio device you want audio from.Int Activate(ref System.The basic steps to record and play from a WASAPI loopback are to: Int SetMute( bool bMute, System.Guid pguidEventContext) Int GetMasterVolumeLevelScalar(out float pfLevel) Int SetMasterVolumeLevelScalar(float fLevel, System.Guid pguidEventContext) Because headphones and speakers will have different audio settings, the loop ensures that the audio is adjusted if a user plugs in a different audio device during the test.Īdd-Type -TypeDefinition The script will end after 15 minutes of looping. It will continue to loop every 30 seconds. When the user first logs in, it will adjust the audio. This script is linked as a PowerShell logon script for our users when testing. My second instinct was the internet. The PowerShell script below will unmute the computer and raise the audio to 90%. Fortunately, I didn’t first try unmuting a computer by running no-volume. Unfortunately, that cmdlet has nothing to do with sound as it is part of the storage module. I searched the cmdlets for volume and saw a very promising cmdlet named Set-Volume. My first instinct was to start with PowerShell. We ran into this exact problem during a recent practice run. This setup works great unless something actually needs to be changed – like unmuting the audio or adjusting the volume. Labs either automatically login (if reserved for testing) or students use a generic username/password. A common setup is to use a custom user interface with a mandatory profile as this simplifies the entire process. ![]() Many schools are gearing up for standardized testing season.
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