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                 6 <= X_UA[ 'iOS' ] ? 'loadeddata' :\r
   9                 X_UA[ 'iOS' ] < 5  ? 'stalled' :\r
  10                 X_UA[ 'iOS' ]      ? 'suspend' :\r
  11                 X_UA[ 'AndroidBrowser2' ] ? 'stalled' : // Android 2.3.5(SBM101SH) では stalled は発生しない,,,\r
  12                 X_UA[ 'AndroidBrowser4' ] ? 'loadeddata' : \r
  13                 X_UA[ 'OperaMobile' ] || X_UA[ 'OperaTablet' ] ? 'loadeddata' : 'loadeddata', //'canplay',\r
  14         X_Audio_HTMLAudioWrapper,\r
  15         X_Audio_constructor = window[ 'Audio' ] || window.HTMLAudioElement,\r
  16         X_Audio_rawAudio,\r
  17         // 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
  18         X_Audio_HTMLAudioWrapper_currentTimeFix  = !!X_UA[ 'OperaMobile' ] || !!X_UA[ 'OperaTablet' ], // || ( X_UA[ 'WinPhone' ] && X_UA[ 'IE9' ] ),\r
  19         // Android1.6+MobileOpera12では無理っぽい、、、\r
  20         X_Audio_HTMLAudioWrapper_badOperaAndroid = X_Audio_HTMLAudioWrapper_currentTimeFix && X_UA[ 'Android' ] < 2,\r
  21 \r
  22         // 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
  23         // opera12 volume, mute の変更が2度目以降できない\r
  24         // 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
  25         // canplay で play() durationchange で duration が取れたら loadedmetadata->loadeddata -> canplay する\r
  26         // 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
  27         // Opera12.17 Win32(XP) portable apps は勝手に再生が始まる、、、その際には timeupdate が発行されない、、、　iframe+image+audio で使わないときは破棄する、とか。\r
  28         // opera11、10.54 WinXP はまとも、、、\r
  29         // X_Audio_Sprite_handleEvent でも使用\r
  30         X_Audio_HTMLAudioWrapper_ieMobile9Fix    = ( X_UA[ 'WinPhone' ] && X_UA[ 'IE9' ] ),\r
  31         X_Audio_HTMLAudioWrapper_durationFix     = ( !X_Audio_HTMLAudioWrapper_currentTimeFix && 12 <= X_UA[ 'Opera' ] ),\r
  32         \r
  33         X_Audio_HTMLAudioWrapper_shortPlayFix    = X_UA[ 'AndroidBrowser' ] && X_UA[ 'AndroidWebkit' ] <= 534.3, // Android 4.1.1 でも遭遇\r
  34         \r
  35         X_Audio_codecs;\r
  36 \r
  37 if( X_Audio_constructor && !X_Audio_HTMLAudioWrapper_badOperaAndroid ){\r
  38         //http://himaxoff.blog111.fc2.com/blog-entry-97.html\r
  39         //引数なしで new Audio() とすると、Operaでエラーになるそうなので注意。\r
  40         X_Audio_rawAudio = new X_Audio_constructor( '' );\r
  41 \r
  42         if( X_Audio_rawAudio.canPlayType ){\r
  43                 X_Audio_codecs = {\r
  44               'mp3'  : X_Audio_rawAudio.canPlayType('audio/mpeg'),\r
  45               'opus' : X_Audio_rawAudio.canPlayType('audio/ogg; codecs="opus"'),\r
  46               'ogg'  : X_Audio_rawAudio.canPlayType('audio/ogg; codecs="vorbis"'),\r
  47               'wav'  : X_Audio_rawAudio.canPlayType('audio/wav; codecs="1"'),\r
  48               'aac'  : X_Audio_rawAudio.canPlayType('audio/aac'),\r
  49               'm4a'  : X_Audio_rawAudio.canPlayType('audio/x-m4a') + X_Audio_rawAudio.canPlayType('audio/m4a') + X_Audio_rawAudio.canPlayType('audio/aac'),\r
  50               'mp4'  : X_Audio_rawAudio.canPlayType('audio/x-mp4') + X_Audio_rawAudio.canPlayType('audio/mp4') + X_Audio_rawAudio.canPlayType('audio/aac'),\r
  51               'weba' : X_Audio_rawAudio.canPlayType('audio/webm; codecs="vorbis"')\r
  52                 };\r
  53                 (function( k, v ){\r
  54                         for( k in X_Audio_codecs ){\r
  55                                 if( X_EMPTY_OBJECT[ k ] ) continue;\r
  56                                 v = X_Audio_codecs[ k ];\r
  57                                 X_Audio_codecs[ k ] = v && v.split( 'no' ).join( '' );\r
  58                                 console.log( k + ' ' + X_Audio_codecs[ k ] );\r
  59                         };\r
  60                 })();\r
  61         } else {\r
  62                 // iOS3.2.3\r
  63                 X_Audio_codecs = {\r
  64               'mp3'  : X_UA[ 'IE' ] || X_UA[ 'Chrome' ] || ( X_UA[ 'Windows' ]  && X_UA[ 'Safari' ]  ),\r
  65               'ogg'  : 5 <= X_UA[ 'Gecko' ] || X_UA[ 'Chrome' ] || X_UA[ 'Opera' ] ,\r
  66               'wav'  : X_UA[ 'Gecko' ] || X_UA[ 'Opera' ] || ( X_UA[ 'Windows' ]  && X_UA[ 'Safari' ]  ),\r
  67               'aac'  : X_UA[ 'IE' ] || X_UA[ 'WebKit' ],\r
  68               'm4a'  : X_UA[ 'IE' ] || X_UA[ 'WebKit' ],\r
  69               'mp4'  : X_UA[ 'IE' ] || X_UA[ 'WebKit' ],\r
  70               'weba' : 2 <= X_UA[ 'Gecko' ] || 10.6 <= X_UA[ 'Opera' ] // firefox4+(Gecko2+)\r
  71                 };\r
  72         };\r
  73         \r
  74         X_Audio_HTMLAudioWrapper = X_Audio_AbstractAudioBackend[ 'inherits' ](\r
  75                 'X.AV.HTML5AudioWrapper',\r
  76                 X_Class.POOL_OBJECT,\r
  77                 {\r
  78                         _playTime        : 0,\r
  79                         _closed          : true,\r
  80                         _loaded          : false,\r
  81                         _beginTime       : 0,\r
  82                         _playForDuration : 0,\r
  83                         _lastCurrentTime : 0,\r
  84                         _src             : '',\r
  85                         \r
  86                         Constructor : function( target, source, option ){\r
  87                                 var raw;\r
  88                                 \r
  89                                 this.target  = target || this;\r
  90                                 this._closed = false;\r
  91                                 \r
  92                                 this.setState( option );\r
  93 \r
  94                                 if( option[ 'useVideo' ] ){\r
  95                                         this[ '_rawObject' ]  = raw = document.createElement( 'video' );\r
  96                         raw.preload           = 'none'; // auto, metadata, none\r
  97                         //raw.autoplay = false, // no-auto\r
  98                         raw.loop              = false;\r
  99                         raw.muted             = false;\r
 100                         raw.crossorigin       = option[ 'crossorigin' ] || ''; //crossorigin: "anonymous", X.URL.isSameDomain() で切り替え\r
 101                         raw.style.cssText     = 'position:absolute;bottom:0;left:-50px;width:100px;height:100px;opacity:0;';\r
 102                                         raw.controls          = false;\r
 103                                         raw.WebKitPlaysInline = true;\r
 104                                         raw.src               = source;\r
 105                                         //raw.onclick  = "alert('play');this.actualPlay();";\r
 106                                         document.body.appendChild( raw );\r
 107                                         //raw.load();\r
 108                                 } else {\r
 109                                         this[ '_rawObject' ] = X_Audio_rawAudio || new X_Audio_constructor( source );\r
 110                                         // X_Doc_create( 'audio', { src : source } )[ 'appendTo' ]( X.Doc.body );\r
 111                                         this[ '_rawObject' ].autobuffer = false;\r
 112                                         this._src = source;\r
 113                                 };\r
 114                                 \r
 115                                 this[ 'listen' ]( [\r
 116                                                 'loadstart', 'load', 'progress', 'suspend', 'abort', 'error', 'emptied', 'stalled', 'play', 'pause', 'loadedmetadata',\r
 117                                                 'loadeddata', 'waiting', 'playing', 'canplay', 'canplaythrough', 'seeking', 'seeked', 'timeupdate', 'ended',\r
 118                                                 'ratechange', 'durationchange', 'volumechange' ], this.handleEventProxy );                              \r
 119 \r
 120                                 //document.body.appendChild( this[ '_rawObject' ] );\r
 121                                 this[ '_rawObject' ].autoplay = false;\r
 122 \r
 123                                 if( X_Audio_rawAudio === this[ '_rawObject' ] ){\r
 124                                         if( X_Audio_HTMLAudioWrapper_badOperaAndroid ){\r
 125                                                 X_Audio_HTMLAudioWrapper_badOperaAndroid && alert( 12 );\r
 126                                                 X_EventDispatcher_toggleAllEvents( this, false );\r
 127                                                 this[ '_rawObject' ] = new X_Audio_constructor( X_URL_toAbsolutePath( source ) );\r
 128                                                 //X_EventDispatcher_toggleAllEvents( this, true );\r
 129                                         } else {\r
 130                                                 X_Audio_rawAudio.src = source;\r
 131                                         };\r
 132 \r
 133                                         //this[ '_rawObject' ] = new X_Audio_constructor( X_URL_toAbsolutePath( source ) );\r
 134                                         /*!X_Audio_Sprite_needTouchFirst && */ X_Audio_rawAudio.load(); // 要る?\r
 135                                         X_Audio_rawAudio = null;\r
 136                                 };\r
 137 \r
 138                                 this[ 'listenOnce' ]( X_EVENT_KILL_INSTANCE );\r
 139                         },\r
 140                         \r
 141                         handleEvent : function( e ){\r
 142                                 switch( e.type ){\r
 143 \r
 144                                         case X_EVENT_KILL_INSTANCE :\r
 145                                                 // 【javascript】モバイル向けブラウザでも音を鳴らしたい【WebAudio】\r
 146                                                 // http://ingaouhou.com/archives/3633\r
 147                                                 // ・使い終わったインスタンスはload()しておくとやや安定\r
 148                                                 this.playing && this.actualPause();\r
 149                                                 delete this._closed;\r
 150                                                 delete this._loaded;\r
 151                                                 \r
 152                                                 this[ '_rawObject' ].src = '';\r
 153                                                 this[ '_rawObject' ].load();\r
 154                                                 \r
 155                                                 // removeChild for video\r
 156                                                 break;\r
 157                                 };\r
 158                         },\r
 159                         /*\r
 160                          * http://uguisu.skr.jp/html/table3.html\r
 161                          */\r
 162                         handleEventProxy : function( e ){\r
 163                                 var type, loaded, end, now;\r
 164                                 \r
 165                                 X_Audio_HTMLAudioWrapper_badOperaAndroid && alert( e.type );\r
 166                                 \r
 167                                 //console.log( e.type );\r
 168                                 \r
 169                                 switch( e.type ){\r
 170                                         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
 171                                                 break;\r
 172                                         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
 173                                                 console.log( e.loaded + ' ' + e.total * 100 + '%' );\r
 174                                                 // iem9 で常に0 this[ '_rawObject' ].networkState;\r
 175                                                 // opera Android 12 で　buffered.end() へのアクセスはエラー　try catch も無効、iem9 は常に end(0) = 0\r
 176                                                 //console.log( 'buffered.end ' + this[ '_rawObject' ].buffered && this[ '_rawObject' ].buffered.end(0) ); \r
 177                                                 break;\r
 178                                         \r
 179                                         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
 180                                                 if( X_Audio_HTMLAudioWrapper_durationFix && this._playForDuration === 0 ){\r
 181                                                         //console.log( 'DurationFix開始 - ' + this[ '_rawObject' ].duration );\r
 182                                                         this._playForDuration = 1;\r
 183                                                         this[ '_rawObject' ].play();\r
 184                                                         this[ '_rawObject' ].currentTime = this._beginTime / 1000; // 必要！\r
 185                                                         return;\r
 186                                                 };\r
 187                                         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
 188                                         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
 189                                         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
 190                                                 if( X_Audio_HTMLAudioWrapper_durationFix && this._playForDuration !== 2 ) return;\r
 191                                                 this.duration = this.duration || this[ '_rawObject' ].duration * 1000;\r
 192                                                 break;\r
 193         \r
 194                                         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
 195                                                 // Android2 で ready 扱い?\r
 196                                         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
 197                                                 // iOS で ready 扱い\r
 198                                         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
 199                                         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
 200                                                 break;\r
 201                                                 \r
 202                                         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
 203                                                 type = X_EVENT_ERROR;\r
 204                                                 break;\r
 205                                         \r
 206                                         case 'playing' :        //      再生が開始された場合に発生\r
 207                                                 if( X_Audio_HTMLAudioWrapper_currentTimeFix ){\r
 208                                                         this._playTime  = X_Timer_now();\r
 209                                                 };\r
 210                                                 type = X_EVENT_MEDIA_PLAYING;\r
 211                                         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
 212                                         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
 213                                         case 'seeked' :         //      シークがfalseに変化した場合に発生\r
 214                                         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
 215                                         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
 216                                                 if( this._playForDuration === 1 ) return;\r
 217                                                 break;\r
 218                                                 \r
 219                                         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
 220                                                 type = X_EVENT_MEDIA_WAITING;\r
 221                                         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
 222                                                 type = type || X_EVENT_MEDIA_SEEKING;\r
 223                                                 if( this._playForDuration === 1 ) return;\r
 224                                                 break;\r
 225                                                 \r
 226                                         case 'ended' :\r
 227                                                 if( !this._closed && this.autoLoop ){\r
 228                                                         if( !( this.target[ 'dispatch' ]( X_EVENT_MEDIA_BEFORE_LOOP ) & X_Callback_PREVENT_DEFAULT ) ){\r
 229                                                                 this.looped = true;\r
 230                                                                 this.target[ 'dispatch' ]( X_EVENT_MEDIA_LOOPED );\r
 231                                                                 this.actualPlay();\r
 232                                                         };\r
 233                                                         return;\r
 234                                                 };\r
 235                                                 type = X_EVENT_MEDIA_ENDED;\r
 236                                                 this.seekTime = 0;\r
 237                                                 delete this.playing;\r
 238                                                 break;\r
 239         \r
 240                                         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
 241                                                 if( X_Audio_HTMLAudioWrapper_ieMobile9Fix ){\r
 242                                                         if( this._playForDuration === 1 ){\r
 243                                                                 console.log( 'tu ' + this[ '_rawObject' ].duration );\r
 244                                                                 if( !this.duration && X_Type_isFinite( this[ '_rawObject' ].duration ) ){\r
 245                                                                         this.duration = this.duration || this[ '_rawObject' ].duration * 1000;\r
 246                                                                         this._playForDuration = 2;\r
 247                                                         loaded = true;\r
 248                                                         //console.log( 'durationFix が完了' + this.duration );\r
 249                                                         break;\r
 250                                                                 } else {\r
 251                                                                         this[ '_rawObject' ].currentTime = this._beginTime / 1000; // 必要！\r
 252                                                                         return;\r
 253                                                                 };\r
 254                                                         } else\r
 255                                                         if( this[ '_rawObject' ].currentTime === this._lastCurrentTime ){\r
 256                                                                 //this.target[ 'dispatch' ]( 'seeking' );\r
 257                                                                 this.target[ 'dispatch' ]( X_EVENT_MEDIA_WAITING );\r
 258                                                                 return;\r
 259                                                         };\r
 260                                                         this._lastCurrentTime = this[ '_rawObject' ].currentTime;\r
 261                                                 };\r
 262                                                 this.duration = this.duration || this[ '_rawObject' ].duration * 1000;\r
 263 \r
 264                                     if( this.playing ){\r
 265                                         end = X_AudioWrapper_getEndTime( this );\r
 266                                         now = this.getActualCurrentTime();\r
 267                                         //console.log( end + ' / ' + now );\r
 268                                         if( 0 + end <= 0 + now ){ // なぜか iem9 で必要,,,\r
 269                                                 if( this.autoLoop ){\r
 270                                                         if( !( this.target[ 'dispatch' ]( X_EVENT_MEDIA_BEFORE_LOOP ) & X_Callback_PREVENT_DEFAULT ) ){\r
 271                                                                 this.looped = true;\r
 272                                                                 this.target[ 'dispatch' ]( X_EVENT_MEDIA_LOOPED );\r
 273                                                                 this.actualPlay();\r
 274                                                         };\r
 275                                                 } else {\r
 276                                                         this.actualPause();\r
 277                                                         this.target[ 'dispatch' ]( X_EVENT_MEDIA_ENDED );\r
 278                                                 };\r
 279                                                 return;\r
 280                                         };\r
 281                                     } else {\r
 282                                         return;\r
 283                                     };\r
 284                                     type = X_EVENT_MEDIA_PLAYING;\r
 285                                                 break;\r
 286                                                 \r
 287                                         case 'durationchange' : // duration属性が更新された場合に発生\r
 288                                                 \r
 289                                                 if( !X_Audio_HTMLAudioWrapper_durationFix ){\r
 290                                                         this.duration = this[ '_rawObject' ].duration * 1000;\r
 291                                                 } else\r
 292                                                 // Desktop Opera では Infinity, IEM9 では NaN\r
 293                                                 if( !this.duration && X_Type_isFinite( this[ '_rawObject' ].duration ) ){\r
 294                                                         \r
 295                                                         //console.log( this[ '_rawObject' ].duration );\r
 296                                                         \r
 297                                                         this.duration = this[ '_rawObject' ].duration * 1000;\r
 298                                                         \r
 299                                                         if( this._playForDuration === 0 ) this._playForDuration = 2;\r
 300                                                         \r
 301                                                         if( this._playForDuration === 1 ){\r
 302                                                                 this._playForDuration = 2;\r
 303                                                                 \r
 304                                                                 console.log( 'Loaded ' + this._loaded );\r
 305                                                                 \r
 306                                                                 if( this._loaded ){\r
 307                                                                         this[ '_rawObject' ].currentTime = this._beginTime / 1000;\r
 308                                                                         console.log( '設定 ' + this._beginTime );\r
 309                                                                         return;\r
 310                                                                 };\r
 311 \r
 312                                                 loaded = true;\r
 313                                                 console.log( 'durationFix が完了' + this.duration );\r
 314                                                 \r
 315                                                 if( this.autoplay ){\r
 316                                                                         this[ '_rawObject' ].currentTime = this._beginTime / 1000;      \r
 317                                                 } else {\r
 318                                                         // Opera12.17 WinXP で勝手に再生される不具合\r
 319                                                         // これで一応再生は止まる、、、\r
 320                                                                         this[ '_rawObject' ].src = '';\r
 321                                                                         //this[ '_rawObject' ].load();                                          \r
 322                                                 };\r
 323                                                         };\r
 324                                                         \r
 325                                                 };\r
 326                                                 break;\r
 327                                         \r
 328                                 };\r
 329                                 \r
 330                                 \r
 331                                 if( !this._loaded && ( loaded || e.type === X_Audio_HTMLAudio_playTrigger || e.type === 'loadeddata' ) ){\r
 332                                         this.autoplay && X_Timer_once( 16, this, this.play );\r
 333                                         this._loaded = true;\r
 334                                         this.target[ 'asyncDispatch' ]( X_EVENT_READY );\r
 335                                         console.log( 'Loaded! ' + e.type + ' d:' + ( this.duration | 0 ) );\r
 336                                         return;\r
 337                                 };\r
 338                                 \r
 339                                 if( !loaded && type ){\r
 340                                         this.target[ 'dispatch' ]( type );\r
 341                                         type === X_EVENT_ERROR && this[ 'kill' ]();\r
 342                                 };\r
 343                         },\r
 344 \r
 345                         actualPlay : function(){\r
 346                                 var begin, end;\r
 347                                 \r
 348                                 // もし kill 後に autoplayTimer で呼ばれても、_closed==true なので平気\r
 349                                 if( this._closed ) return;\r
 350                                 if( !this._loaded /* && !X_Audio_Sprite_inTouchAction */ ){\r
 351                         this.autoplay = true;\r
 352                         return;\r
 353                                 };\r
 354 \r
 355                                 if( X_Audio_HTMLAudioWrapper_ieMobile9Fix && this._playForDuration === 0 ){\r
 356                                         console.log( 'DurationFix開始 - ' + this[ '_rawObject' ].duration );\r
 357                                         this._playForDuration = 1;\r
 358                                 };\r
 359 \r
 360                                 end   = X_AudioWrapper_getEndTime( this );\r
 361                                 begin = this._beginTime = X_AudioWrapper_getStartTime( this, end, true );\r
 362 \r
 363                     if( X_Audio_HTMLAudioWrapper_shortPlayFix ){\r
 364                         begin -= end - begin > 1000 ? 200 : 400;\r
 365                         begin  = begin < 0 ? 0 : begin;\r
 366                     };\r
 367 \r
 368                                 if( !this[ '_rawObject' ].src ){\r
 369                                         this._beginTime = begin;\r
 370                                         this[ '_rawObject' ].src = this._src;\r
 371                                         delete this._playForDuration;\r
 372                                 };\r
 373 \r
 374                             if( !this.playing ){\r
 375                                     if( X_UA[ 'Chrome' ] ){ // [CHROME][FIX] volume TODO どの version で 修正される？\r
 376                                         // [!] delay\r
 377                                         X_Timer_once( 0, this, this._fixForChrome );\r
 378                                         this[ '_rawObject' ].volume = 0;\r
 379                                     } else {\r
 380                                         this[ '_rawObject' ].volume = this.gain;\r
 381                                     };\r
 382                                 this[ '_rawObject' ].play();\r
 383                                 this.playing = true;\r
 384                             };\r
 385                                 //http://himaxoff.blog111.fc2.com/blog-entry-97.html\r
 386                                 //Firefox3.6では一度も play() していない状態で currentTime = 0 を実行するとエラーになる。\r
 387                                 //また、GoogleChrome7 では currentTime = 0 直後に play() すると、pause()した位置前後の音が混ざることがある。(少なくとも自分の環境では)\r
 388                                 this[ '_rawObject' ].currentTime = this._lastCurrentTime = begin / 1000;\r
 389 \r
 390                             console.log( '[HTMLAudio] play ' + begin + ' -> ' + end );\r
 391                     \r
 392                     if( X_Audio_HTMLAudioWrapper_currentTimeFix ){\r
 393                         this._beginTime = begin;\r
 394                         this._playTime  = X_Timer_now();\r
 395                     };\r
 396 \r
 397                         },\r
 398                                 \r
 399                                 // [CHROME][FIX] volume\r
 400                                 _fixForChrome : X_UA[ 'Chrome' ] && function(){\r
 401                                         !this._closed && ( this[ '_rawObject' ].volume = this.gain );\r
 402                                 },\r
 403                         \r
 404                         actualPause : function(){\r
 405                                 if( !this.playing ) return;\r
 406                                 \r
 407                                 this.seekTime = this.getActualCurrentTime();\r
 408 \r
 409                                 delete this._playTime;\r
 410 \r
 411                         !this[ '_rawObject' ].error && this[ '_rawObject' ].pause();\r
 412                         \r
 413                         if( X_Audio_HTMLAudioWrapper_durationFix ){\r
 414                                 this[ '_rawObject' ].src = '';\r
 415                                 // load();\r
 416                         };\r
 417                         delete this.playing;\r
 418                         },\r
 419                         \r
 420                         getActualCurrentTime : function(){\r
 421                                 return ( X_Audio_HTMLAudioWrapper_currentTimeFix ?\r
 422                                                                 X_Timer_now() - this._playTime + this._beginTime :\r
 423                                                                 this[ '_rawObject' ].currentTime * 1000 | 0 );\r
 424                         },\r
 425                 /*\r
 426                 http://www.w3schools.com/tags/av_prop_error.asp\r
 427                 1 = MEDIA_ERR_ABORTED - fetching process aborted by user\r
 428             2 = MEDIA_ERR_NETWORK - error occurred when downloading\r
 429             3 = MEDIA_ERR_DECODE - error occurred when decoding\r
 430             4 = MEDIA_ERR_SRC_NOT_SUPPORTED - audio/video not supported\r
 431             */                  \r
 432                         getActualError : function(){\r
 433                                 return this[ '_rawObject' ].error || 0;\r
 434                         },\r
 435                         \r
 436                         afterUpdateState : function( result ){\r
 437                                 if( result & 3 ){ // seek\r
 438                         this.actualPlay();\r
 439                                 } else\r
 440                                 if( result & 4 ){\r
 441                        this[ '_rawObject' ].volume = this.gain;\r
 442                                 };                              \r
 443                         }\r
 444         \r
 445                 }\r
 446         );\r
 447         \r
 448         X_Audio_BACKENDS.push(\r
 449                 {\r
 450                         backendName : 'HTML Audio',\r
 451                 /*\r
 452                  * 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
 453                  * https://developer.mozilla.org/ja/docs/Web/HTML/Supported_media_formats\r
 454                  * \r
 455                  * 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
 456                  * http://sothis.blog.so-net.ne.jp/2010-10-27\r
 457                  * 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
 458                  * \r
 459                  * IE9 の HTML5 Audio について\r
 460                  * http://kentablog.cluscore.com/2011/05/ie9-html5-audio.html\r
 461                  * 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
 462                  * 2.クロスドメインアクセスには、「clientaccesspolicy.xml」か「crossdomain.xml」が必要\r
 463                  * 3.wav が不可\r
 464                  * \r
 465                  * IE9でHTML5 autio タグが無効になる\r
 466                  * http://bbs.wankuma.com/index.cgi?mode=al2&namber=64886&KLOG=109\r
 467                  *  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
 468                  *  createElement等で動的生成すると、よろしくない\r
 469                  * \r
 470                  * media-can-play-wav-audio.html\r
 471                  * https://github.com/adobe/webkit/blob/master/LayoutTests/media/media-can-play-wav-audio.html\r
 472                  * testExpected("audio.canPlayType('audio/wav; codecs=1')", "probably");\r
 473                  * \r
 474                  * HTML5 audioタグ ブラウザ間の違い\r
 475                  * 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
 476                  *  - volume, muted iPhone(iOS4-6)、Android(2.3.6)では動作せず。\r
 477                  *  - 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
 478                  */     \r
 479                         detect : function( proxy, source, ext ){\r
 480                                 /*\r
 481                                 var ok, mineType = 'audio/' + ext;\r
 482                                 switch( ext ){\r
 483                                         case 'mp3' :\r
 484                                                 ok = X_UA[ 'IE' ] || X_UA[ 'Chrome' ] || ( X_UA[ 'Windows' ]  && X_UA[ 'Safari' ]  );\r
 485                                                 mineType = 'audio/mpeg';\r
 486                                                 //if( X_UA[ 'Android' ] && X_UA[ 'Gecko' ] ) mineType = '';\r
 487                                                 break;\r
 488                                         case 'ogg' :\r
 489                                                 ok = 15 <= X_UA[ 'Gecko' ] || X_UA[ 'Chrome' ] || X_UA[ 'Opera' ] ;\r
 490                                                 if( X_UA[ 'AndroidBrowser' ] ) mineType = '';\r
 491                                                 break;\r
 492                                         case 'm4a' :\r
 493                                                 ok = X_UA[ 'IE' ] || X_UA[ 'WebKit' ];\r
 494                                                 mineType = 'audio/mp4';\r
 495                                                 break;\r
 496                                         case 'webm' :\r
 497                                                 ok = 2 <= X_UA[ 'Gecko' ] || 10.6 <= X_UA[ 'Opera' ] ; // firefox4+(Gecko2+)\r
 498                                                 break;\r
 499                                         case 'wav' :\r
 500                                                 ok = X_UA[ 'Gecko' ] || X_UA[ 'Opera' ] || ( X_UA[ 'Windows' ]  && X_UA[ 'Safari' ]  );\r
 501                                                 //mineType = 'audio/wav'; // audio/x-wav ?\r
 502                                                 break;\r
 503                                         default :\r
 504                                                 mineType = '';\r
 505                                 };\r
 506                                 \r
 507                                 if( !ok && mineType ){\r
 508                                         if( !X_Audio_rawAudio ) X_Audio_rawAudio = new Audio;\r
 509                                         ok = X_Audio_rawAudio.canPlayType( mineType );\r
 510                                         //console.log( 'HTML Audio ' + ok + ' ext:' + ext );\r
 511                                 };\r
 512                                 console.log( 'HTML Audio ' + ok + ' ext:' + ext );\r
 513                                 */\r
 514                                 \r
 515                                 proxy[ 'asyncDispatch' ]( { type : X_EVENT_COMPLETE, canPlay : X_Audio_codecs[ ext ] } );\r
 516                         },\r
 517                         \r
 518                         klass : X_Audio_HTMLAudioWrapper\r
 519                         \r
 520                 } );\r
 521 \r
 522 /*\r
 523  * \r
 524  * howler.js\r
 525  *     codecs = {\r
 526       mp3: !!audioTest.canPlayType('audio/mpeg;').replace(/^no$/, ''),\r
 527       opus: !!audioTest.canPlayType('audio/ogg; codecs="opus"').replace(/^no$/, ''),\r
 528       ogg: !!audioTest.canPlayType('audio/ogg; codecs="vorbis"').replace(/^no$/, ''),\r
 529       wav: !!audioTest.canPlayType('audio/wav; codecs="1"').replace(/^no$/, ''),\r
 530       aac: !!audioTest.canPlayType('audio/aac;').replace(/^no$/, ''),\r
 531       m4a: !!(audioTest.canPlayType('audio/x-m4a;') || audioTest.canPlayType('audio/m4a;') || audioTest.canPlayType('audio/aac;')).replace(/^no$/, ''),\r
 532       mp4: !!(audioTest.canPlayType('audio/x-mp4;') || audioTest.canPlayType('audio/mp4;') || audioTest.canPlayType('audio/aac;')).replace(/^no$/, ''),\r
 533       weba: !!audioTest.canPlayType('audio/webm; codecs="vorbis"').replace(/^no$/, '')\r
 534     };\r
 535  */\r
 536         \r
 537 };\r
 538 \r
 539 \r
 540 \r
 541 \r
 542 \r