BGM Class

//----------------------------------------
//  Plays background music &
//  manages loop points + fading
//----------------------------------------
using UnityEngine;

namespace Dark_Earth
{
    public class BGM : Singleton<BGM>
    {
        protected BGM () {}

        private const string FILE_EXTENSION = ".ogg";

        private AudioSource m_pMusic;
        private string m_sBGM_File = "";
        private float m_fLoop_From, m_fLoop_To, m_fFade_Time, m_fFade_Volume;
        private float m_fVolume = 1.00f;
        bool m_bFading;

        //----------------------------------------
        //  Allocate Memory
        //----------------------------------------
        void Awake ()
        {
            m_pMusic = gameObject.AddComponent ("AudioSource") as AudioSource;
        }

        //----------------------------------------
        //  Loop points + fading
        //----------------------------------------
        void Update ()
        {
            if (m_pMusic == null)
                return;
            if (m_bFading == true)
            {
                m_fFade_Volume -= ((1 / m_fFade_Time) * Time.deltaTime);
                if (m_fFade_Volume <= 0)
                    Stop ();
                else
                    m_pMusic.volume = (m_fVolume * m_fFade_Volume);
            }
            else
                m_pMusic.volume = m_fVolume;
            if (m_pMusic.loop == true)
            {
                if (m_pMusic.time >= m_fLoop_To)
                    m_pMusic.time = m_fLoop_From;
            }
        }

        //----------------------------------------
        //  Play BGM
        //----------------------------------------
        public void Play (string sFile, bool bLoop, float fLoop_From, float fLoop_To)
        {
            string sPath = (Application.dataPath + "/Resources/BGM/" + sFile + FILE_EXTENSION);
            if (System.IO.File.Exists (sPath) == false)
                return;
            if (sFile == m_sBGM_File)
                return;

            m_sBGM_File = sFile;
            m_bFading = false;
            if (m_pMusic.clip != null)
                Resources.UnloadAsset (m_pMusic.clip);
            m_pMusic.clip = Resources.Load ("BGM/"+sFile) as AudioClip;
            m_pMusic.loop = bLoop;
            if (fLoop_To == 0.00f)
                fLoop_To = m_pMusic.clip.length;
            m_fLoop_From = fLoop_From;
            m_fLoop_To = fLoop_To;

            m_pMusic.Play ();
        }
        public void Play (string sFile, bool bLoop)
        {
            Play (sFile, bLoop, 0.00f, 0.00f);
        }
        public void Play (string sFile)
        {
            Play (sFile, true);
        }

        //----------------------------------------
        //  Fading
        //----------------------------------------
        public void Fade_Out (float fTime)
        {
            if (m_sBGM_File == "")
                return;

            m_bFading = true;
            m_fFade_Time = fTime;
            m_fFade_Volume = 1.00f;
        }

        //----------------------------------------
        //  BGM Stop
        //----------------------------------------
        public void Stop ()
        {
            if (m_sBGM_File == "")
                return;
            m_pMusic.Stop ();
            m_sBGM_File = "";
            m_bFading = false;
        }

        //----------------------------------------
        //  BGM Pause
        //----------------------------------------
        public void Pause ()
        {
            if (m_sBGM_File == "" || m_bFading == true)
                return;
            m_pMusic.Pause ();

        }

        public int Volume
        {
            set { m_fVolume = ((float)value / 100); }
            get { return ((int)m_fVolume * 100); }
        }
    }
}

//@Copyright by Rhutos, Rising Games