Animatroller.MonoExpander.Main.PlayNextBackground C# (CSharp) Method

        private void PlayNextBackground()
        {
            if (this.fmodSystem == null)
                return;

            // Find next background track
            if (this.backgroundAudioTracks.Count == 0)
                // No tracks
                return;

            int index;
            while (true)
            {
                index = this.random.Next(this.backgroundAudioTracks.Count - 1);
                if (this.backgroundAudioTracks.Count > 1 && this.currentBgTrack == index)
                    continue;
                break;
            }
            this.currentBgTrack = index;
            string fileName = this.backgroundAudioTracks[index];
            this.currentBgTrackName = Path.GetFileName(fileName);

            this.log.Info("Play background track {0}", Path.GetFileName(fileName));

            var sound = this.fmodSystem.CreateStream(fileName, Mode.Default);

            try
            {
                var chn = this.currentBgChannel;
                if (chn.HasValue)
                {
                    // Make sure we reset this first so we can ignore the callback
                    this.currentBgChannel = null;
                    chn?.Stop();
                }
            }
            catch (FmodInvalidHandleException)
            {
                // Ignore
            }

            if (this.currentBgSound.HasValue)
                this.disposeList.Add(this.currentBgSound);
            this.currentBgSound = null;

            var channel = this.fmodSystem.PlaySound(sound, this.bgGroup, true);

            string bgName = this.currentBgTrackName;
            channel.SetCallback((type, data1, data2) =>
            {
                if (type == ChannelControlCallbackType.End)
                {
                    this.log.Debug("Background {0} ended", bgName);

                    SendMessage(new AudioFinished
                    {
                        Id = bgName,
                        Type = AudioTypes.Background
                    });

                    if (this.currentBgChannel.HasValue)
                        PlayNextBackground();
                }
            });

            this.currentBgSound = sound;
            this.currentBgChannel = channel;

            // Play
            channel.Pause = false;

            SendMessage(new AudioStarted
            {
                Id = bgName,
                Type = AudioTypes.Background
            });

        }