Cocos2dxMusic.java

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org

http://www.cocos2d-x.org

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 ****************************************************************************/
package org.cocos2dx.lib;

import java.io.FileInputStream;

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;
	private boolean mIsmid = false;

	// ===========================================================
	// 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.createMediaplayer(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.createMediaplayer(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.createMediaplayer(pPath);

				// record the path
				this.mCurrentPath = pPath;
			}
		}
		
		if(this.mCurrentPath.indexOf(".mid")!=-1){
			mIsmid = true;
		}

		if (this.mBackgroundMediaPlayer == null) {
			Log.e(Cocos2dxMusic.TAG, "playBackgroundMusic: background media player is null");
		} else {
			// if the music is playing or paused, stop it
			if (!mIsmid)
				this.mBackgroundMediaPlayer.stop();

			this.mBackgroundMediaPlayer.setLooping(isLoop);

			try {
				if (!mIsmid)
					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) {
			if (mIsmid)
				this.mBackgroundMediaPlayer.pause();
			else
				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 createMediaplayer(final String pPath) {
		MediaPlayer mediaPlayer = new MediaPlayer();

		try {
			if (pPath.startsWith("/")) {
				final FileInputStream fis = new FileInputStream(pPath);
				mediaPlayer.setDataSource(fis.getFD());
				fis.close();
			} 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
	// ===========================================================
}