content: /****************************************************************************
  Copyright (c) 2010-2011 cocos2d-x.org
  
  http://www.cocos2d-x.org
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
   ****************************************************************************/
  package org.cocos2dx.lib;
  
  import android.content.Context;
  import android.content.res.AssetFileDescriptor;
  import android.media.MediaPlayer;
  import android.util.Log;
  
  public class Cocos2dxMusic {
  	// ===========================================================
  	// Constants
  	// ===========================================================
  
  	private static final String TAG = Cocos2dxMusic.class.getSimpleName();
  
  	// ===========================================================
  	// Fields
  	// ===========================================================
  
  	private final Context mContext;
  	private MediaPlayer mBackgroundMediaPlayer;
  	private float mLeftVolume;
  	private float mRightVolume;
  	private boolean mPaused;
  	private String mCurrentPath;
  
  	// ===========================================================
  	// Constructors
  	// ===========================================================
  
  	public Cocos2dxMusic(final Context pContext) {
  		this.mContext = pContext;
  
  		this.initData();
  	}
  
  	// ===========================================================
  	// Getter & Setter
  	// ===========================================================
  
  	// ===========================================================
  	// Methods for/from SuperClass/Interfaces
  	// ===========================================================
  
  	// ===========================================================
  	// Methods
  	// ===========================================================
  
  	public void preloadBackgroundMusic(final String pPath) {
  		if ((this.mCurrentPath == null) || (!this.mCurrentPath.equals(pPath))) {
  			// preload new background music
  
  			// release old resource and create a new one
  			if (this.mBackgroundMediaPlayer != null) {
  				this.mBackgroundMediaPlayer.release();
  			}
  
  			this.mBackgroundMediaPlayer = this.createMediaplayerFromAssets(pPath);
  
  			// record the path
  			this.mCurrentPath = pPath;
  		}
  	}
  
  	public void playBackgroundMusic(final String pPath, final boolean isLoop) {
  		if (this.mCurrentPath == null) {
  			// it is the first time to play background music or end() was called
  			this.mBackgroundMediaPlayer = this.createMediaplayerFromAssets(pPath);
  			this.mCurrentPath = pPath;
  		} else {
  			if (!this.mCurrentPath.equals(pPath)) {
  				// play new background music
  
  				// release old resource and create a new one
  				if (this.mBackgroundMediaPlayer != null) {
  					this.mBackgroundMediaPlayer.release();
  				}
  				this.mBackgroundMediaPlayer = this.createMediaplayerFromAssets(pPath);
  
  				// record the path
  				this.mCurrentPath = pPath;
  			}
  		}
  
  		if (this.mBackgroundMediaPlayer == null) {
  			Log.e(Cocos2dxMusic.TAG, "playBackgroundMusic: background media player is null");
  		} else {
  			// if the music is playing or paused, stop it
  			this.mBackgroundMediaPlayer.stop();
  
  			this.mBackgroundMediaPlayer.setLooping(isLoop);
  
  			try {
  				this.mBackgroundMediaPlayer.prepare();
  				this.mBackgroundMediaPlayer.seekTo(0);
  				this.mBackgroundMediaPlayer.start();
  
  				this.mPaused = false;
  			} catch (final Exception e) {
  				Log.e(Cocos2dxMusic.TAG, "playBackgroundMusic: error state");
  			}
  		}
  	}
  
  	public void stopBackgroundMusic() {
  		if (this.mBackgroundMediaPlayer != null) {
  			this.mBackgroundMediaPlayer.stop();
  
  			// should set the state, if not, the following sequence will be error
  			// play -> pause -> stop -> resume
  			this.mPaused = false;
  		}
  	}
  
  	public void pauseBackgroundMusic() {
  		if (this.mBackgroundMediaPlayer != null && this.mBackgroundMediaPlayer.isPlaying()) {
  			this.mBackgroundMediaPlayer.pause();
  			this.mPaused = true;
  		}
  	}
  
  	public void resumeBackgroundMusic() {
  		if (this.mBackgroundMediaPlayer != null && this.mPaused) {
  			this.mBackgroundMediaPlayer.start();
  			this.mPaused = false;
  		}
  	}
  
  	public void rewindBackgroundMusic() {
  		if (this.mBackgroundMediaPlayer != null) {
  			this.mBackgroundMediaPlayer.stop();
  
  			try {
  				this.mBackgroundMediaPlayer.prepare();
  				this.mBackgroundMediaPlayer.seekTo(0);
  				this.mBackgroundMediaPlayer.start();
  
  				this.mPaused = false;
  			} catch (final Exception e) {
  				Log.e(Cocos2dxMusic.TAG, "rewindBackgroundMusic: error state");
  			}
  		}
  	}
  
  	public boolean isBackgroundMusicPlaying() {
  		boolean ret = false;
  
  		if (this.mBackgroundMediaPlayer == null) {
  			ret = false;
  		} else {
  			ret = this.mBackgroundMediaPlayer.isPlaying();
  		}
  
  		return ret;
  	}
  
  	public void end() {
  		if (this.mBackgroundMediaPlayer != null) {
  			this.mBackgroundMediaPlayer.release();
  		}
  
  		this.initData();
  	}
  
  	public float getBackgroundVolume() {
  		if (this.mBackgroundMediaPlayer != null) {
  			return (this.mLeftVolume + this.mRightVolume) / 2;
  		} else {
  			return 0.0f;
  		}
  	}
  
  	public void setBackgroundVolume(float pVolume) {
  		if (pVolume < 0.0f) {
  			pVolume = 0.0f;
  		}
  
  		if (pVolume > 1.0f) {
  			pVolume = 1.0f;
  		}
  
  		this.mLeftVolume = this.mRightVolume = pVolume;
  		if (this.mBackgroundMediaPlayer != null) {
  			this.mBackgroundMediaPlayer.setVolume(this.mLeftVolume, this.mRightVolume);
  		}
  	}
  
  	private void initData() {
  		this.mLeftVolume = 0.5f;
  		this.mRightVolume = 0.5f;
  		this.mBackgroundMediaPlayer = null;
  		this.mPaused = false;
  		this.mCurrentPath = null;
  	}
  
  	/**
  	 * create mediaplayer for music
  	 * 
  	 * @param pPath
  	 *            the pPath relative to assets
  	 * @return
  	 */
  	private MediaPlayer createMediaplayerFromAssets(final String pPath) {
  		MediaPlayer mediaPlayer = new MediaPlayer();
  
  		try {
  			if (pPath.startsWith("/")) {
  				mediaPlayer.setDataSource(pPath);
  			} else {
  				final AssetFileDescriptor assetFileDescritor = this.mContext.getAssets().openFd(pPath);
  				mediaPlayer.setDataSource(assetFileDescritor.getFileDescriptor(), assetFileDescritor.getStartOffset(), assetFileDescritor.getLength());
  			}
  
  			mediaPlayer.prepare();
  
  			mediaPlayer.setVolume(this.mLeftVolume, this.mRightVolume);
  		} catch (final Exception e) {
  			mediaPlayer = null;
  			Log.e(Cocos2dxMusic.TAG, "error: " + e.getMessage(), e);
  		}
  
  		return mediaPlayer;
  	}
  
  	// ===========================================================
  	// Inner and Anonymous Classes
  	// ===========================================================
  }
  