/*
*   JavaScript interface for the SoundCloud Player widget
*   Author: Matas Petrikas, matas@soundcloud.com
*   Copyright (c) 2009  SoundCloud Ltd.
*   Licensed under the MIT license:
*   http://www.opensource.org/licenses/mit-license.php
*/
(function(){
  var isIE = (/msie/i).test(navigator.userAgent) && !(/opera/i).test(navigator.userAgent);
  
  var soundcloud = window.soundcloud = {
    version: "0.1",
    debug: false,
    _listeners: [],
    // re-dispatches widget events in the DOM, using JS library support, the events also should bubble up the DOM
    _redispatch: function(eventType, flashId, data) {
      try{
        // find the flash player
        var playerNode = this.getPlayer(flashId),
            listeners  = this._listeners[eventType] || [];
            // construct the custom eventType  e.g. 'soundcloud:onPlayerReady'
            customEventType = 'soundcloud:' + eventType;
      }catch(e){
        if(this.debug && window.console){
          console.error('unable to dispatch widget event ' + eventType + ' for the widget id ' + flashId, data, e);
        }
        return;
      }
      // re-dispatch SoundCloud events up in the DOM
      if(window.jQuery){
        // if jQuery is available, trigger the custom event
        jQuery(playerNode).trigger(customEventType, [data]);
      }else if(window.Prototype){
        // if Prototype.js is available, fire the custom event
        $(playerNode).fire(customEventType, data);
      }else{
        // TODO add more JS libraries that support custom DOM events
      }
      // if there are any listeners registered to this event, trigger them all
      for(i in listeners){
        listeners[i].apply(playerNode, [playerNode, data]);
      }
      // log the events in debug mode
      if(this.debug && window.console){
        console.log(customEventType, eventType, flashId, data);
      }

    },
    // you can add multiple listeners to a certain event
    // e.g. soundcloud.addEventListener('onPlayerReady', myFunctionOne);
    //      soundcloud.addEventListener('onPlayerReady', myFunctionTwo);
    addEventListener: function(eventType, callback) {
      if(!this._listeners[eventType]){
        this._listeners[eventType] = [];
      }
      this._listeners[eventType].push(callback);
    },
    // you can also remove the function listener if e.g you want to trigger it only once
    // soundcloud.removeEventListener('onMediaPlay', myFunctionOne);
    removeEventListener: function(eventType, callback) {
      var listeners = this._listeners[eventType];
      if(listeners){
        for(i in listeners){
          if(listeners[i] === callback){
            listeners.splice(i, 1);
          }
        }
      }
    },
    // get widget node based on its id (if object tag) or name (if embed tag)
    // if you're using SWFObject or other dynamic Flash generators, please make sure that you set the id parameter
    //  only if the DOM has an id/name it's possible to call player's methods.
    // Important!: because of the bug in Opera browser, the Flash can't get its own id
    // so the generator should set it additionally through flashvars parameter 'object_id'
    getPlayer: function(id){
      var flash;
      try{
        if(!id){
          throw "The SoundCloud Widget DOM object needs an id atribute, please refer to SoundCloud Widget API documentation.";
        }
        flash = isIE ? window[id] : document[id];
        if(flash){
          if(flash.api_getFlashId){
            return flash;
          }else{
            throw "The SoundCloud Widget External Interface is not accessible. Check that allowscriptaccess is set to 'always' in embed code";
          }
        }else{
          throw "The SoundCloud Widget with an id " + id + " couldn't be found";
        }
      }catch(e){
        if (console && console.error) {
         console.error(e);
        }
        throw e;
      }
    },
    // fired when widget has loaded its data and is ready to accept calls from outside
    // the widget will call these functions only if in it's flashvars there's a parameter enable_api=true
    // @flashId: the widget id, basically the Flash node should be accessible to JS with soundcloud.getPlayer(flashId)
    // @data: an object containing .mediaUri (eg. 'http://api.soundcloud.com/tracks/49931') .mediaId (e.g. '4532')
    // in buffering events data contains also .percent = (e.g. '99')
    onPlayerReady: function(flashId, data) {
      this._redispatch('onPlayerReady', flashId, data);
    },
    // fired when widget starts playing current track (fired only once per track)
    onMediaStart : function(flashId, data) {
      this._redispatch('onMediaStart', flashId, data);
    },
    // fired when the track/playlist has finished playing
    onMediaEnd : function(flashId, data) {
      this._redispatch('onMediaEnd', flashId, data);
    },
    // fired when widget starts playing current track (fired on every play, seek)
    onMediaPlay : function(flashId, data) {
      this._redispatch('onMediaPlay', flashId, data);
    },
    // fired when track was paused
    onMediaPause : function(flashId, data) {
      this._redispatch('onMediaPause', flashId, data);
    },
    // fired when the widget is still buffering, means you can't seek in the track fully yet
    onMediaBuffering : function(flashId, data) {
      this._redispatch('onMediaBuffering', flashId, data);
    },
    // fired when the widget is done buffering and the whole track length is seekable
    onMediaDoneBuffering : function(flashId, data) {
      this._redispatch('onMediaDoneBuffering', flashId, data);
    },
    // fired when the widget can't get the requested data from the server (the resource is removed, hidden, etc.)
    onPlayerError : function(flashId, data) {
      this._redispatch('onPlayerError', flashId, data);
    }
  };
  
})();


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