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Audio Adding AudioMixer, AudioMixer groups programatically or any alternative

Discussion in 'Audio & Video' started by JMota7, Apr 5, 2023.

  1. JMota7

    JMota7

    Joined:
    Nov 15, 2017
    Posts:
    6
    Hi everyone,

    I want to modify the pitch from multiple AudioSources in a scene, these AudioSources are attached to GameObjects that are instantiated and the AudioSource components are attached programatically. So, after struggling with this for a while, I tried to use Unity AudioMixer and its groups, but I could not instantiate at runtime those AudioMixers and after reading the API, it seems that it is on purpose.

    So, I would like to change the pitch programmatically without altering any AudioClip. Is that possible using AudioMixers? or using an alternative?

    Thanks a lot!
     
    JMota7, Apr 5, 2023
    #1

  2. SeventhString

    SeventhString

    Unity Technologies

    Joined:
    Jan 12, 2023
    Posts:
    305
    I'd suggest you have a kind of PitchManager (or any relevant audio management class in your context) to which your sources would subscribe/unsubscribe in their Enable/Disable methods.

    Code (CSharp):
    1. [RequireComponent(typeof(AudioSource))]
    2. public class LinkToPitchManager: MonoBehaviour
    3. {
    4.     public PitchManager pitchManager; // could be a singleton, ScriptableObject, something set manually, etc..
    5.  
    6.     private void OnEnable()
    7.     {
    8.         pitchManager.Register(GetComponent<AudioSource>());
    9.     }
    10.  
    11.     public void Unregister(AudioSource source)
    12.     {
    13.         pitchManager.Unregister(GetComponent<AudioSource>());
    14.     }
    15. }
    16.  
    17. public class PitchManager : MonoBehaviour
    18. {
    19.     private List<AudioSource> audioSources = new List<AudioSource>();
    20.  
    21.     public void Register(AudioSource source)
    22.     {
    23.         if (!audioSources.Contains(source))
    24.         {
    25.             audioSources.Add(source);
    26.         }
    27.     }
    28.  
    29.     public void Unregister(AudioSource source)
    30.     {
    31.         if (audioSources.Contains(source))
    32.         {
    33.             audioSources.Remove(source);
    34.         }
    35.     }
    36.  
    37.     public void UpdatePitch(float newPitch)
    38.     {
    39.         foreach (AudioSource source in audioSources)
    40.         {
    41.             source.pitch = newPitch;
    42.         }
    43.     }
    44. }
     
    SeventhString, Apr 12, 2023
    #2

  3. jmota_vbw

    jmota_vbw

    Joined:
    Nov 16, 2022
    Posts:
    1
    Thanks for your answer!

    Sorry, but I didn't explain myself properly. The thing is, I'm trying to change the pitch of an audio signal without changing its speed. So, as far as I know, this needs a pitch shifter to not alter the speed of the audio instead of changing it through the AudioSource. Does there exist a solution for this?

    I'm starting to use FMOD, but I don't know if I'm using a sledgehammer to crack a nut...
     
    Last edited: Apr 13, 2023
    jmota_vbw, Apr 12, 2023
    #3

  4. SeventhString

    SeventhString

    Unity Technologies

    Joined:
    Jan 12, 2023
    Posts:
    305
    Mmmmm... yes...

    You might have to stretch out before getting on this!

    I don't think there is anything like this on the Asset Store. The shortest path I'd see is writing a C++ DLL wrapping an external audio library (SoundTouch?) and then exposing it so it alters your audio data in OnAudioFilterRead or as an AudioMixer native audio plugin.

    *evil laughter heard in distant tunnels*
     
    SeventhString, Apr 12, 2023
    #4
    jmota_vbw likes this.