/// <summary>
/// Adds a new audio song.
/// </summary>
/// <param name="key">The key of the audio song.</param>
/// <param name="audioEffect">The audio song.</param>
public void AddAudioSong(string key, AudioSong audioSong)
{
if (audioSongs.ContainsKey(key))
{
throw new Exception("They given key is already in use:" + key);
}
audioSongs.Add(key, audioSong);
}
/// <summary>
/// Play the audio song.
/// </summary>
/// <param name="key">The key of the audio song to play.</param>
public void PlayAudioSong(string key)
{
if (!audioSongs.ContainsKey(key))
{
throw new KeyNotFoundException("There is no audio song for the key: " + key);
}
if (activeAudioSong == null)
{
activeAudioSong = audioSongs[key];
activeAudioSong.VolumeTransitionIn();
}
else
{
nextAudioSong = audioSongs[key];
activeAudioSong.VolumeTransitionOut();
}
}
/// <summary>
/// Updates all sound effects and songs.
/// </summary>
/// <param name="gameTime">The game time since the last update.</param>
public void Update(GameTime gameTime)
{
// update all audio effects
foreach (var audioEffect in audioEffects.Values)
{
audioEffect.Update(gameTime);
}
// update music song
if (activeAudioSong != null)
{
// switch music song, when the transition is over
if (nextAudioSong != null)
{
if (!activeAudioSong.IsVolumeTransitionActive)
{
if (MediaPlayer.State == MediaState.Playing)
{
MediaPlayer.Stop();
}
activeAudioSong = nextAudioSong;
activeAudioSong.Reset();
activeAudioSong.VolumeTransitionIn();
MediaPlayer.Play(activeAudioSong.Song);
nextAudioSong = null;
}
}
// adjust music player volume
if (activeAudioSong.IsVolumeTransitionActive)
{
// TODO: check if the frequent volume update causes performance problems
MediaPlayer.Volume = audioSettings.MusicVolume * activeAudioSong.CurrentAudioVolumeFactor;
}
activeAudioSong.Update(gameTime);
}
}