NScumm.Sky.Sound.FnStartFx C# (CSharp) Method

        public void FnStartFx(uint sound, byte channel)
        {
            SaveSounds[channel] = 0xFFFF;
            if (sound < 256 || sound > MaxFxNumber || SystemVars.Instance.SystemFlags.HasFlag(SystemFlags.FxOff))
                return;

            var screen = (byte)(Logic.ScriptVariables[Logic.SCREEN] & 0xff);
            if (sound == 278 && screen == 25) // is this weld in room 25
                sound = 394;

            unchecked
            {
                sound &= (uint)~(1 << 8);
            }

            var sfx = MusicList[sound];
            var roomList = sfx.RoomList;

            var i = 0;
            if (roomList[i].RoomNo != 0xff) // if room list empty then do all rooms
                while (roomList[i].RoomNo != screen)
                {
                    // check rooms
                    i++;
                    if (roomList[i].RoomNo == 0xff)
                        return;
                }

            // get fx volume

            var volume = _mainSfxVolume; // start with standard vol

            if (SystemVars.Instance.SystemFlags.HasFlag(SystemFlags.Sblaster))
                volume = roomList[i].AdlibVolume;
            if (SystemVars.Instance.SystemFlags.HasFlag(SystemFlags.Roland))
                volume = roomList[i].RolandVolume;
            volume = (byte)((volume * _mainSfxVolume) >> 8);

            // Check the flags, the sound may come on after a delay.
            if ((sfx.Flags & SfxfStartDelay) != 0)
            {
                for (var cnt = 0; cnt < MaxQueuedFx; cnt++)
                {
                    if (SfxQueue[cnt].Count == 0)
                    {
                        SfxQueue[cnt].Chan = channel;
                        SfxQueue[cnt].FxNo = sfx.SoundNo;
                        SfxQueue[cnt].Vol = volume;
                        SfxQueue[cnt].Count = (byte)(sfx.Flags & 0x7F);
                        return;
                    }
                }
                return; // ignore sound if it can't be queued
            }

            if ((sfx.Flags & SfxfSave) != 0)
                SaveSounds[channel] = (ushort)(sfx.SoundNo | (volume << 8));

            PlaySound(sfx.SoundNo, volume, channel);
        }