public AudioChannelPool(int mixerIndex, int channelIndex, GameObject parent)
{
// Set this template channel
index = (mixerIndex, channelIndex);
// Get the channel referenced by the index
AudioChannel channel = AudioSettings.GetChannel(index);
// Create an object under my transform
gameObject = new GameObject($"Output {channelIndex}: '{channel.Output}'");
gameObject.transform.SetParent(parent.transform);
// Initialize the array
pool = new AudioSource[channel.AudioSourceCount];
// Create an audio source for each element in the array
for (int i = 0; i < pool.Length; i++)
{
// Create an object for the source and set its parent
GameObject sourceObject = new GameObject($"Source {i}");
sourceObject.transform.SetParent(gameObject.transform);
// Add the audio source and set it up
pool[i] = sourceObject.AddComponent <AudioSource>();
pool[i].outputAudioMixerGroup = channel.Output;
pool[i].playOnAwake = false;
}
}
// Change this to not throw and instead use an "out" parameter
public static bool GetVolume(AudioChannelIndex index, out float volume)
{
bool result = GetDecibels(index, out volume);
volume = DecibelsToVolume(volume);
return(result);
}
// Change this to return true or false
public static void ResetDecibels(AudioChannelIndex index)
{
AudioMixer mixer = index.MixerIndex.Data.Mixer;
bool success = mixer.ClearFloat(GetVolumeParameterName(index));
if (!success)
{
Debug.LogWarning(GetMissingParameterWarning(index));
}
}
// Change this to not throw and instead use an "out" parameter
public static bool GetDecibels(AudioChannelIndex index, out float decibels)
{
AudioMixer mixer = index.MixerIndex.Data.Mixer;
bool result = mixer.GetFloat(GetVolumeParameterName(index), out decibels);
// If there was no volume then log a warning
if (!result)
{
Debug.LogWarning(GetMissingParameterWarning(index));
}
return(result);
}
// Change this to return true or false
public static bool SetVolume(AudioChannelIndex index, float volume)
{
AudioMixer mixer = index.MixerIndex.Data.Mixer;
bool success = mixer.SetFloat(
GetVolumeParameterName(index),
VolumeToDecibels(volume));
if (!success)
{
Debug.LogWarning(GetMissingParameterWarning(index));
}
return(success);
}
// Arbitrary channel
public static AudioSource PlayFromChannel(AudioClip clip, AudioChannelIndex index, int sourceIndex = -1, bool looping = false)
{
// If index is null then throw an exception
if (index == null)
{
throw new ArgumentNullException(nameof(index));
}
// If the number is invalid then throw an exception
if (index.MixerIndex.Index < 0 || index.MixerIndex.Index >= Instance.audioPools.Length)
{
throw IndexOutOfRangeException(index.MixerIndex);
}
// Play from the channel on the correct audio pool
return(Instance.audioPools[index.MixerIndex.Index].PlayFromChannel(clip, index.ChannelIndex, sourceIndex, looping));
}
public static AudioChannel GetChannel(AudioChannelIndex index)
{
AudioMixerData mixer = GetMixer(index.MixerIndex);
return(mixer.GetChannel(index.ChannelIndex));
}
public static string GetVolumeParameterName(AudioChannelIndex index)
{
return($"{index.Channel.Output.name}Volume");
}
public static string GetMissingParameterWarning(AudioChannelIndex index)
{
return($"Expected audio mixer '{index.MixerIndex.Data.Mixer}' " +
$"to have exposed parameter with the name '{GetVolumeParameterName(index)}', " +
$"but no such parameter could be found.");
}
