private void Setup()
{
// Create an audio pool for each audio channel
AudioMixerData[] allMixers = AudioSettings.AllMixers;
audioPools = new AudioMixerPool[allMixers.Length];
// Setup an audio pool for every audio channel
for (int i = 0; i < audioPools.Length; i++)
{
audioPools[i] = new AudioMixerPool(i, gameObject);
}
}
private static AudioSource PlayInternal(AudioClip clip, AudioMixerIndex index, int sourceIndex, bool looping, string methodSuffix)
{
// If index is null then set it to default
if (index == null)
{
index = AudioMixerIndex.Default;
}
// If index is invalid then throw an exception
if (index.Index < 0 || index.Index >= Instance.audioPools.Length)
{
throw IndexOutOfRangeException(index);
}
// Get the audio pool and identified method
AudioMixerPool pool = Instance.audioPools[index.Index];
string methodName = $"Play{methodSuffix}";
MethodInfo playMethod = pool.GetType().GetMethod($"Play{methodSuffix}");
// If reflection did not find the method then throw an internal error
if (playMethod == null)
{
throw new Exception($"INTERNAL ERROR: " +
$"no method defined in type '{nameof(AudioMixerPool)}' " +
$"with the name '{methodName}'");
}
// Get the result of the method
object result = playMethod.Invoke(pool, new object[] { clip, sourceIndex, looping });
// Check to make sure the object is not null
if (result is null)
{
throw new Exception("INTERNAL ERROR: " +
$"The return value of the method '{methodName}' " +
$"for the type '{nameof(AudioMixerPool)}' " +
$"is not permitted to be null");
}
// Check to make sure the result is an audio source
if (!(result is AudioSource))
{
throw new InvalidCastException($"INTERNAL ERROR: " +
$"The return value of the method '{methodName}' " +
$"for the type '{nameof(AudioMixerPool)}' must be of type " +
$"'{nameof(AudioSource)}', not type '{result.GetType().Name}'");
}
return(result as AudioSource);
}