0.6.x/js/07_audio/02_XHTMLAudio.js

   1 \r
   2 /*\r
   3  * original : uupaa-js HTML5Audio.js\r
   4  * https://code.google.com/p/uupaa-js/source/browse/trunk/0.8/src/Audio/HTML5Audio.js?r=568\r
   5  */\r
   6 \r
   7 var X_Audio_HTMLAudio_playTrigger =\r
   8                 X_UA.iOS ? 'suspend' :\r
   9                 X_UA.AndroidBrowser2 ? 'stalled' : // Android 2.3.5(SBM101SH) では stalled は発生しない,,,\r
  10                 X_UA.AndroidBrowser4 ? 'loadeddata' : 'canplay',\r
  11         X_Audio_HTMLAudioWrapper,\r
  12         X_Audio_rawAudio,\r
  13         // Opera Mobile 12 android4.4.4 & 2.3.5 は 2回目以降の currentTime へのセットで currentTime が更新されなくなるため、タイマーを使用する\r
  14         X_Audio_HTMLAudioWrapper_currentTimeFix  = !!X_UA.OperaMobile || !!X_UA.OperaTablet,\r
  15         // 一方 Desktop の Opera12 は、loadeddata 等では duration が infinity で、再生後の durationchange 時に duration が判明する。\r
  16         // duration 判明後には currentTime によるシークと、現在時間の取得が可能になる。\r
  17         // canplay で play() durationchange で duration が取れたら loadedmetadata->loadeddata -> canplay する\r
  18         // boombox.js に書いてあった currentTime の効かないブラウザってこいつのことみたい、、、\r
  19         X_Audio_HTMLAudioWrapper_currentTimeFix2 = !X_Audio_HTMLAudioWrapper_currentTimeFix && X_UA.Opera,\r
  20         \r
  21         X_Audio_HTMLAudioWrapper_shortPlayFix    = !!X_UA.AndroidBrowser4;\r
  22         \r
  23 \r
  24 if( window.HTMLAudioElement ){\r
  25         \r
  26         X_Audio_HTMLAudioWrapper = X.EventDispatcher.inherits(\r
  27                 'X.AV.HTML5AudioWrapper',\r
  28                 X.Class.POOL_OBJECT,\r
  29                 {\r
  30                         \r
  31                         proxy           : null,\r
  32                         \r
  33                         startTime       : 0,\r
  34                         endTime         : -1,\r
  35                         loopStartTime   : -1,\r
  36                         loopEndTime     : -1,\r
  37                         seekTime        : -1,\r
  38                         duration        : 0,\r
  39                         \r
  40                         playing         : false,\r
  41                         error           : 0,                    \r
  42                         loop            : false,\r
  43                         looped          : false,\r
  44                         autoplay        : false,\r
  45                         volume          : 0.5,\r
  46 \r
  47             _timerID         : 0,\r
  48                         _playTime        : 0,\r
  49                         _closed          : true,\r
  50                         _loaded          : false,\r
  51                         _playForDuration : false,\r
  52                         _currentTimeFix  : 0,\r
  53                         _shortFix        : 0,\r
  54                         \r
  55                         Constructor : function( proxy, source, option ){\r
  56                                 this.proxy   = proxy;\r
  57                                 this._closed = false;\r
  58                                 \r
  59                                 X_AudioWrapper_updateStates( this, option );\r
  60 \r
  61                                 if( option[ 'useVideo' ] ){\r
  62                                         this._rawObject = document.createElement( 'video' );\r
  63                         this._rawObject.preload           = 'none'; // auto, metadata, none\r
  64                         //this._rawObject.autoplay = false, // no-auto\r
  65                         this._rawObject.loop     = false;\r
  66                         this._rawObject.muted    = false;\r
  67                         //this._rawObject.crossorigin       = option[ 'crossorigin' ] || ''; //crossorigin: "anonymous", X.URL.isSameDomain() で切り替え\r
  68                         this._rawObject.style.cssText     = 'position:absolute;bottom:0;left:-50px;width:100px;height:100px;opacity:0;';\r
  69                                         this._rawObject.controls          = false;\r
  70                                         this._rawObject.WebKitPlaysInline = true;\r
  71                                         this._rawObject.src               = source;\r
  72                                         //this._rawObject.onclick  = "alert('play');this.play();";\r
  73                                         document.body.appendChild( this._rawObject );\r
  74                                         //this._rawObject.load();\r
  75                                 } else {\r
  76                                         this._rawObject = X_Audio_rawAudio || new Audio( source );// X_Doc_create( 'audio', { src : source } ).appendToRoot();//( X.X_Node_systemNode );\r
  77                                 };\r
  78                                 \r
  79                                 this.listen( [\r
  80                                                 'loadstart', 'load', 'progress', 'suspend', 'abort', 'error', 'emptied', 'stalled', 'play', 'pause', 'loadedmetadata',\r
  81                                                 'loadeddata', 'waiting', 'playing', 'canplay', 'canplaythrough', 'seeking', 'seeked', 'timeupdate', 'ended',\r
  82                                                 'ratechange', 'durationchange', 'volumechange' ], this.handleEventProxy );                              \r
  83                                 \r
  84                                 if( X_Audio_rawAudio === this._rawObject ){\r
  85                                         X_Audio_rawAudio.src = source;\r
  86                                         /*!X_Audio_Sprite_needTouchFirst && */ X_Audio_rawAudio.load(); // 要る?\r
  87                                         X_Audio_rawAudio = null;\r
  88                                 };\r
  89 \r
  90                                 //document.body.appendChild( this._rawObject );\r
  91 \r
  92                                 this._rawObject.autoplay = false;\r
  93                                 \r
  94                                 this.listenOnce( X.Event.KILL_INSTANCE );\r
  95                         },\r
  96                         \r
  97                         handleEvent : function( e ){\r
  98                                 switch( e.type ){\r
  99 \r
 100                                         case X.Event.KILL_INSTANCE :\r
 101                                                 break;\r
 102                                 };\r
 103                         },\r
 104                         /*\r
 105                          * http://uguisu.skr.jp/html/table3.html\r
 106                          */\r
 107                         handleEventProxy : function( e ){\r
 108                                 var loaded;\r
 109                                 console.log( 'HTMLAudio ' + e.type );\r
 110                                 \r
 111                                 switch( e.type ){\r
 112                                         case 'loadstart' :      //      ブラウザがコンテンツの検索を開始した場合に発生\r
 113                                                 break;\r
 114                                         case 'progress' :       //      ブラウザがコンテンツの取得を実行した場合に発生\r
 115                                                 console.log( e.loaded + ' ' + e.total * 100 + '%' );\r
 116                                                 //this._rawObject.duration &&\r
 117                                                 //      console.dir( this._rawObject );\r
 118                                                         //console.log( this._rawObject.buffered.end(0) / this._rawObject.duration * 100 + '%' );\r
 119                                                 break;\r
 120                                         \r
 121                                         case 'canplay' :        //      今すぐに再生を再開できるが、バッファリングが不十分でコンテンツを最後まで表示できないと予測している場合に発生\r
 122                                                 if( X_Audio_HTMLAudioWrapper_currentTimeFix2 ){\r
 123                                                         console.log( 'play ' + this.duration );\r
 124                                                         this._playForDuration = true;\r
 125                                                         this._rawObject.currentTime = 0;\r
 126                                                         this._rawObject.play();\r
 127                                                         this._rawObject.currentTime = 0;\r
 128                                                 };\r
 129                                         case 'loadedmetadata' : //      ブラウザがメディアリソースの長さと寸法を判定した場合に発生\r
 130                                         case 'loadeddata' :     //      コンテンツの表示を現在の再生位置で初めて行えるようになった場合に発生\r
 131                                         case 'canplaythrough' : //      今すぐに再生を開始してもバッファリングで停止することなく最後まで表示できると予測している場合に発生\r
 132                                                 if( X_Audio_HTMLAudioWrapper_currentTimeFix2 ) return;\r
 133                                                 this.duration = this._rawObject.duration * 1000;\r
 134                                                 console.log( this.duration );\r
 135                                                 break;\r
 136         \r
 137                                         case 'suspend' :        //      ブラウザが意図的にコンテンツの取得を現在行っていない場合に発生（ダウンロードは未完了）\r
 138                                         case 'abort' :          //      ダウンロードの完了前にコンテンツの取得を停止した場合に発生（この停止はエラーによるものではない）\r
 139                                         case 'error' :          //      コンテンツの取得実行中にエラーが発生した場合に発生\r
 140                                         case 'emptied' :        //      読み込み中に致命的なエラーが発生したか、実行状態ででload()メソッドが実行された場合に発生\r
 141                                         case 'stalled' :        //      ブラウザがコンテンツの取得を試みたが、データがまだ用意されていない場合に発生\r
 142                                                 break;\r
 143                                         \r
 144                                         \r
 145                                         case 'play' :           //      再生が開始された。play()メソッドからの復帰後に発生する場合に発生\r
 146                                         case 'pause' :          //      再生が一時停止された。pauseメソッドからの復帰後に発生する場合に発生\r
 147                                         case 'waiting' :        //      次のフレームが利用不可のため再生を停止したが、そのフレームがやがて利用可能になると想定している場合に発生\r
 148                                         case 'playing' :        //      再生が開始された場合に発生 \r
 149                                         case 'seeking' :        //      シークがtrueに変化し、イベントを発生させるのに十分な時間がシーク操作にかかっている場合に発生\r
 150                                         case 'seeked' :         //      シークがfalseに変化した場合に発生\r
 151                                         case 'ratechange' :     // defaultPlaybackRate属性とplaybackRate属性のどちらかが更新された場合に発生\r
 152                                         case 'volumechange' :   // volume属性とmuted属性のどちらかが変化した場合に発生\r
 153                                                 if( this._playForDuration ) return;\r
 154                                                 break;\r
 155                                                 \r
 156                                         case 'timeupdate' :     //      通常の再生が行われ現在の再生位置の変化が起こった場合に発生\r
 157                                                 // console.log( this._rawObject.currentTime );\r
 158                                                 if( this._playForDuration ) return;                     \r
 159                                                 this._onEnded();\r
 160                                                 break;\r
 161                                         \r
 162                                         case 'ended' :\r
 163                                                 if( X_Audio_HTMLAudioWrapper_currentTimeFix2 ){\r
 164                                                         delete this._currentTimeFix;\r
 165                                                 };\r
 166                                                 if( !this._closed && this.loop ){\r
 167                                                         this.looped = true;\r
 168                                                         ( this.proxy.dispatch( 'looped' ) & X.Callback.PREVENT_DEFAULT ) || this.play();\r
 169                                                 } else {\r
 170                                                         this._timerID && X.Timer.remove( this._timerID );\r
 171                                                         this.seekTime = 0;\r
 172                                                         delete this._timerID;\r
 173                                                         delete this.playing;\r
 174                                                 };\r
 175                                                 break;\r
 176         \r
 177                                         case 'durationchange' : // duration属性が更新された場合に発生\r
 178                                                 this.duration = this._rawObject.duration * 1000;\r
 179                                                 // console.log( this._rawObject.duration );\r
 180                                                 \r
 181                                                 if( this._playForDuration ){\r
 182                                                         this._rawObject.pause();\r
 183                                                         this._rawObject.currentTime = 0.001;\r
 184                                                         delete this._playForDuration;\r
 185                                                         \r
 186                                         this.proxy.asyncDispatch( 'loadedmetadata' );\r
 187                                         this.proxy.asyncDispatch( 'loadeddata' );\r
 188                                         this.proxy.asyncDispatch( 'canplay' );\r
 189                                         this.proxy.asyncDispatch( 'canplaythrough' );\r
 190                                         loaded = true;\r
 191                                         console.log( 'DEsktop Opera のための currentTime と duration の fix が完了' + this.duration );\r
 192                                                 };\r
 193                                                 if( this._currentTimeFix === 1 ){\r
 194                                                         this._currentTimeFix++;\r
 195                                                         this._rawObject.currentTime = this._beginTime / 1000;\r
 196                                                         return;\r
 197                                                 };\r
 198                                                 break;\r
 199                                         \r
 200                                 };\r
 201                                 //console.log( 'html5 ' + e.type + ' ' + ( this.proxy._listeners && this.proxy._listeners[ e.type ] && this.proxy._listeners[ e.type ].length ) );\r
 202                                 //e.type === 'canplaythrough' && console.dir( e );\r
 203                                 loaded || this.proxy.dispatch( e );\r
 204                                 \r
 205                                 if( X_Audio_HTMLAudio_playTrigger === e.type || ( X_UA.AndroidBrowser2 && e.type === 'loadeddata' ) || loaded ){\r
 206                                         !this._loaded && this.autoplay && X.Timer.once( 16, this, this.play );\r
 207                                         this._loaded = true;\r
 208                                         console.log( 'Loaded! ' + e.type );\r
 209                                 };\r
 210                         },\r
 211                         \r
 212                         close : function(){\r
 213                                 // 【javascript】モバイル向けブラウザでも音を鳴らしたい【WebAudio】\r
 214                                 // http://ingaouhou.com/archives/3633\r
 215                                 // ・使い終わったインスタンスはload()しておくとやや安定\r
 216                                 this.playing && this.pause();\r
 217                                 delete this._closed;\r
 218                                 delete this._loaded;\r
 219                                 \r
 220                                 this._rawObject.src = '';\r
 221                                 this._rawObject.load();\r
 222                         },\r
 223                         \r
 224                         play : function(){\r
 225                                 var begin, end;\r
 226                                 \r
 227                                 // もし kill 後に autoplayTimer で呼ばれても、_closed==true なので平気\r
 228                                 if( this._closed ) return;\r
 229                                 if( !this._loaded /* && !X_Audio_Sprite_inTouchAction */ ){\r
 230                         this.autoplay = true;\r
 231                         return;\r
 232                                 };\r
 233 \r
 234                                 end   = X_AudioWrapper_getEndTime( this );\r
 235                                 begin = X_AudioWrapper_getStartTime( this, end, true );\r
 236                                 \r
 237 \r
 238                     if( X_Audio_HTMLAudioWrapper_shortPlayFix ){\r
 239                         begin -= end - begin > 1000 ? 200 : 400;\r
 240                         begin  = begin < 0 ? 0 : begin;\r
 241                     };                          \r
 242                                 \r
 243                                 this._rawObject.currentTime = begin / 1000;\r
 244 \r
 245 \r
 246                                 if( X_Audio_HTMLAudioWrapper_currentTimeFix2 ){\r
 247                                         //this._currentTimeFix++;\r
 248                                         this._beginTime = begin;\r
 249                                 };\r
 250 \r
 251                             console.log( '[HTMLAudio] play ' + begin + ' -> ' + end );\r
 252                             \r
 253                             if( !this.playing ){\r
 254                                     if( X_UA.Chrome ){ // [CHROME][FIX] volume TODO どの version で 修正される？\r
 255                                         // [!] delay\r
 256                                         X.Timer.once( 0, this, this._fixForChrome );\r
 257                                         this._rawObject.volume = 0;\r
 258                                     } else {\r
 259                                         this._rawObject.volume = this.volume;\r
 260                                     };\r
 261                                 this._rawObject.play();\r
 262                                 this.playing = true;\r
 263                             };\r
 264                     \r
 265                     if( X_Audio_HTMLAudioWrapper_currentTimeFix ){\r
 266                         //this._timerID && X.Timer.remove( this._timerID );\r
 267                         this._beginTime = begin;\r
 268                         this._playTime  = X_Timer_now();\r
 269                                                 \r
 270                         if( end < this.duration ){\r
 271                                                 //this._timerID   = X.Timer.once( end - begin, this, this._onEnded );\r
 272                         } else {\r
 273                                 delete this._timerID;\r
 274                         };                      \r
 275                     };\r
 276 \r
 277                         },\r
 278                                 \r
 279                                 // [CHROME][FIX] volume\r
 280                                 _fixForChrome : X_UA.Chrome && function(){\r
 281                                         !this._closed && ( this._rawObject.volume = this.volume );\r
 282                                 },\r
 283                                 \r
 284                                 _onEnded : function(){\r
 285                                         var currentTime, time;\r
 286                                         \r
 287                                         delete this._timerID;\r
 288                                         \r
 289                             if( this.playing ){\r
 290                                 currentTime = X_Audio_HTMLAudioWrapper_currentTimeFix ? X_Timer_now() - this._playTime + this._beginTime : this._rawObject.currentTime * 1000 | 0;\r
 291                                 time        = currentTime - X_AudioWrapper_getEndTime( this );\r
 292 \r
 293                                     if( X_Audio_HTMLAudioWrapper_shortPlayFix ){\r
 294                                         //time -= this._shortFix;\r
 295                                     };\r
 296 \r
 297                                 if( time < 0 ){\r
 298                                         console.log( '> onEnd ' + (-time) + ' ' + currentTime + '/' + ( X_AudioWrapper_getEndTime( this ) ) );\r
 299                                         //if( X_Audio_HTMLAudioWrapper_currentTimeFix ) this._timerID = X.Timer.once( -time, this, this._onEnded );\r
 300                                         return;\r
 301                                 };\r
 302                                 \r
 303                                 if( this.loop ){\r
 304                                         this.looped = true;\r
 305                                         ( this.proxy.dispatch( 'looped' ) & X.Callback.PREVENT_DEFAULT ) || this.play();\r
 306                                 } else {\r
 307                                         this.pause();\r
 308                                         this.dispatch( 'ended' );\r
 309                                 };\r
 310                             };\r
 311                                 },\r
 312                         \r
 313                         pause : function(){\r
 314                                 if( !this.playing ) return;\r
 315                                 \r
 316                                 this.seekTime = this.state().currentTime;\r
 317                                 \r
 318                                 if( X_Audio_HTMLAudioWrapper_currentTimeFix2 ){\r
 319                                         delete this._currentTimeFix;\r
 320                                 };\r
 321                                 \r
 322                                 //this._timerID && X.Timer.remove( this._timerID );\r
 323                                 //delete this._timerID;\r
 324                                 delete this._playTime;\r
 325 \r
 326                         !this._rawObject.error && this._rawObject.pause();\r
 327                         delete this.playing;\r
 328                         },\r
 329         \r
 330                         state : function( obj ){\r
 331                                 var result;\r
 332                                 \r
 333                                 if( obj === undefined ){\r
 334                                     return {\r
 335                                         startTime     : this.startTime,\r
 336                                         endTime       : this.endTime < 0 ? this.duration : this.endTime,\r
 337                                         loopStartTime : this.loopStartTime < 0 ? this.startTime : this.loopStartTime,\r
 338                                         loopEndTime   : this.loopEndTime < 0 ? ( this.endTime || this.duration ) : this.loopEndTime,\r
 339                                         \r
 340                                         loop          : this.loop,\r
 341                                         looped        : this.looped,\r
 342                                         volume        : this.volume,\r
 343                                         playing       : this.playing, // && !this._rawObject.error && !this._rawObject.paused && !this._rawObject.ended,                                \r
 344                                         duration      : this.duration,\r
 345                                         \r
 346                                         currentTime   :\r
 347                                                 this.playing ?\r
 348                                                         ( X_Audio_HTMLAudioWrapper_currentTimeFix ?\r
 349                                                                 X_Timer_now() - this._playTime + this._beginTime :\r
 350                                                                 this._rawObject.currentTime * 1000 | 0 ) :\r
 351                                                         this.seekTime,\r
 352                                         /*\r
 353         http://www.w3schools.com/tags/av_prop_error.asp\r
 354         1 = MEDIA_ERR_ABORTED - fetching process aborted by user\r
 355     2 = MEDIA_ERR_NETWORK - error occurred when downloading\r
 356     3 = MEDIA_ERR_DECODE - error occurred when decoding\r
 357     4 = MEDIA_ERR_SRC_NOT_SUPPORTED - audio/video not supported\r
 358     */\r
 359                                         error         : this._rawObject.error || 0   // 0, 1 ~ 4 \r
 360                                     };                                  \r
 361                                 };\r
 362                         \r
 363                                 result = X_AudioWrapper_updateStates( this, obj );\r
 364                             \r
 365                                 if( result & 2 ){ // seek\r
 366                         this.play();\r
 367                                 //} else\r
 368                                 //if( result & 1 ){\r
 369                                         //if( X_Audio_HTMLAudioWrapper_currentTimeFix ){\r
 370                                         //      this.play();                                            \r
 371                                         //};\r
 372 \r
 373                                 } else\r
 374                                 if( result & 4 ){\r
 375                        this._rawObject.volume = this.volume;\r
 376                                 };\r
 377                             \r
 378                         }\r
 379         \r
 380                 }\r
 381         );\r
 382         \r
 383         X_Audio_BACKENDS.push(\r
 384                 {\r
 385                         backendName : 'HTML Audio',\r
 386                 /*\r
 387                  * HTML5 の audio 要素と video 要素でサポートされているメディアフォーマット\r
 388                  * https://developer.mozilla.org/ja/docs/Web/HTML/Supported_media_formats\r
 389                  * \r
 390                  * 主要ブラウザのHTML5 audioタグで使えるファイル形式の再生対応状況を調べてみた\r
 391                  * http://sothis.blog.so-net.ne.jp/2010-10-27\r
 392                  * ダメ元で仕様に含まれていない SHOUTcast もテストしてみました。\r
 393                  * \r
 394                  * IE9 の HTML5 Audio について\r
 395                  * http://kentablog.cluscore.com/2011/05/ie9-html5-audio.html\r
 396                  * 1.Audioオブジェクトを作ることができないので、Audioタグを使う\r
 397                  * 2.クロスドメインアクセスには、「clientaccesspolicy.xml」か「crossdomain.xml」が必要\r
 398                  * 3.wav が不可\r
 399                  * \r
 400                  * IE9でHTML5 autio タグが無効になる\r
 401                  * http://bbs.wankuma.com/index.cgi?mode=al2&namber=64886&KLOG=109\r
 402                  *  IEのバージョン9.0.8112.16421では、Audioオブジェクトのnewも対応してました。\r
 403                  *  createElement等で動的生成すると、よろしくない\r
 404                  * \r
 405                  * media-can-play-wav-audio.html\r
 406                  * https://github.com/adobe/webkit/blob/master/LayoutTests/media/media-can-play-wav-audio.html\r
 407                  * testExpected("audio.canPlayType('audio/wav; codecs=1')", "probably");\r
 408                  * \r
 409                  * HTML5 audioタグ ブラウザ間の違い\r
 410                  * http://wiki.bit-hive.com/tomizoo/pg/HTML5%20audio%A5%BF%A5%B0%20%A5%D6%A5%E9%A5%A6%A5%B6%B4%D6%A4%CE%B0%E3%A4%A4\r
 411                  *  - volume, muted iPhone(iOS4-6)、Android(2.3.6)では動作せず。\r
 412                  *  - FireFox3.6, Android 2.3.6については、src変更後、load()を呼び出さないと切り替わらなかった。iPhoneはload()が不要。\r
 413                  */     \r
 414                         detect : function( proxy, source, ext ){\r
 415                                 var ok, mineType = 'audio/' + ext;\r
 416                                 switch( ext ){\r
 417                                         case 'mp3' :\r
 418                                                 ok = X_UA.IE || X_UA.Chrome || ( X_UA.Windows && X_UA.Safari );\r
 419                                                 mineType = 'audio/mpeg';\r
 420                                                 //if( X_UA.Android && X_UA.Gecko ) mineType = '';\r
 421                                                 break;\r
 422                                         case 'ogg' :\r
 423                                                 ok = 15 <= X_UA.Gecko || X_UA.Chrome || X_UA.Opera;\r
 424                                                 if( X_UA.AndroidBrowser ) mineType = '';\r
 425                                                 break;\r
 426                                         case 'm4a' :\r
 427                                                 ok = X_UA.IE || X_UA.WebKit;\r
 428                                                 mineType = 'audio/mp4';\r
 429                                                 break;\r
 430                                         case 'webm' :\r
 431                                                 ok = 2 <= X_UA.Gecko || 10.6 <= X_UA.Opera; // firefox4+(Gecko2+)\r
 432                                                 break;\r
 433                                         case 'wav' :\r
 434                                                 ok = X_UA.Gecko || X_UA.Opera || ( X_UA.Windows && X_UA.Safari );\r
 435                                                 //mineType = 'audio/wav'; // audio/x-wav ?\r
 436                                                 break;\r
 437                                         default :\r
 438                                                 mineType = '';\r
 439                                 };\r
 440                                 \r
 441                                 if( !ok && mineType ){\r
 442                                         if( !X_Audio_rawAudio ) X_Audio_rawAudio = new Audio;\r
 443                                         ok = X_Audio_rawAudio.canPlayType( mineType );\r
 444                                 };\r
 445                                 \r
 446                                 proxy.asyncDispatch( ok ? 'support' : 'nosupport' );\r
 447                         },\r
 448                         \r
 449                         klass : X_Audio_HTMLAudioWrapper\r
 450                         \r
 451                 } );\r
 452 \r
 453 /*\r
 454  * \r
 455  * howler.js\r
 456  *     codecs = {\r
 457       mp3: !!audioTest.canPlayType('audio/mpeg;').replace(/^no$/, ''),\r
 458       opus: !!audioTest.canPlayType('audio/ogg; codecs="opus"').replace(/^no$/, ''),\r
 459       ogg: !!audioTest.canPlayType('audio/ogg; codecs="vorbis"').replace(/^no$/, ''),\r
 460       wav: !!audioTest.canPlayType('audio/wav; codecs="1"').replace(/^no$/, ''),\r
 461       aac: !!audioTest.canPlayType('audio/aac;').replace(/^no$/, ''),\r
 462       m4a: !!(audioTest.canPlayType('audio/x-m4a;') || audioTest.canPlayType('audio/m4a;') || audioTest.canPlayType('audio/aac;')).replace(/^no$/, ''),\r
 463       mp4: !!(audioTest.canPlayType('audio/x-mp4;') || audioTest.canPlayType('audio/mp4;') || audioTest.canPlayType('audio/aac;')).replace(/^no$/, ''),\r
 464       weba: !!audioTest.canPlayType('audio/webm; codecs="vorbis"').replace(/^no$/, '')\r
 465     };\r
 466  */\r
 467         \r
 468 };\r
 469 \r
 470 \r
 471 \r
 472 \r
 473 \r