Unable to set second AudioSource to loop

Questions & Answers
1

Hi,

Using scripting I added a couple of AudioSource components however I found that when I tried to set AudioSource.audio.loop = true I was always changing the value of the first AudioSource. I tried a number of approaches but this kept happening. I created a brand new empty project in Unity 4.2.1 Pro to demonstrate this. I attached the following script to the MainCamera and then hit run, you can see in the inspector that the loop tickbox on the second audio source is unticked when I think it ought to be ticked.

using UnityEngine;
using System.Collections;

public class audiotest : MonoBehaviour {

	private AudioSource musicAudioSource = null;
	private AudioSource ambientAudioSource = null;
	private AudioSource[] audioSources;
	
	void Awake () {
	    musicAudioSource = gameObject.AddComponent<AudioSource>() as AudioSource;
		musicAudioSource.audio.loop = true;
		
	    ambientAudioSource = gameObject.AddComponent<AudioSource>() as AudioSource;
		ambientAudioSource.audio.loop = true;
		
		// NOTE: musicAudioSource is not the same as ambientAudioSource
		//       however setting ambientAudioSource.audio.loop = false
		//       actually changes the loop boolean on the first AudioSource
		
		if (musicAudioSource == ambientAudioSource)
			Debug.Log("musicAudioSource == ambientAudioSource");
		
		// Another approach to try and set all Audio Sources to loop
		audioSources = GetComponents<AudioSource>();
		for(int i=0; i < audioSources.Length; i++)
		{
			audioSources*.audio.loop = true;*

  •  	Debug.Log("Set audio source " + i + " to loop");*

  •  }*

  •  // Uncomment either of the following two lines and you'll see that*

  •  // the first AudioSource's loop boolean is changed.*

  •  //ambientAudioSource.audio.loop = false;*

  •  //audioSources[1].audio.loop = false;*

  • }*
    }
    Have I misunderstood something here or is this a bug in Unity?
    I have worked around this in my project by creating the audio sources in the inspector, ticking their loop checkboxes, and then working with those in scripting.
    Cheers,
    Mark

2

Don’t use the audio property: audio refers to the first AudioSource attached to the GameObject. You already has the references to all AudioSources: use them directly.

void Awake () {
    musicAudioSource = gameObject.AddComponent<AudioSource>() as AudioSource;
    musicAudioSource.loop = true; // don't use property *audio* !

    ambientAudioSource = gameObject.AddComponent<AudioSource>() as AudioSource;
    ambientAudioSource.loop = true;

Unity allows direct access to several GameObject properties from any of its components, thus ambientAudioSource.audio.loop is the same as gameObject.audio.loop or just audio.loop - that’s why you’re always modifying the same AudioSource (the first one).