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  * Windows 版 Safari は QuickTime のインストールが必要\r
   7  * \r
   8  * 1. iOS4(iPod 2G) で ended に達すると音が鳴らなくなる fix で解決\r
   9  * 2. iOS6(iPod 4G) で ended に達すると音が鳴らなくなる fix で頻度が改善 emded イベントは発しないので、timeupdate 時に currentTime で判断する\r
  10  * 3. WP7(IS12T) で最後の方にある音が鳴らない? mp3 cbr を使えばいい? 裏に回っても音が鳴り続ける\r
  11  * 4. AOSP 2.x で ended に達すると音が鳴らなくなる -> リロード(audio.src='';audio.src=src;audio.load())でで解決\r
  12  * 5. AOSP 3.x で ended に達すると音が鳴らなくなる -> リロード(audio.src='';audio.sr=src)で解決、但し 2.x 4.x より遅延が大きく 1 秒弱程度ある\r
  13  * 6. AOSP 4.4.2- は ended に達した際に currentTime が変更できなくなり、リロードが必要になる, 4.0, 4.1, 4.2, 4.3 で確認, play() で頻度低下\r
  14  * 7. Android 4.4.4 Chrome WebView は ended に達した際に play() が必要\r
  15  * 8. BlinkOpera32 Win8 は HTMLAudio が壊れている、WebAudio は mp3 がデコードに失敗、ogg が動作\r
  16  * \r
  17  * memo\r
  18  * 1. Android4.1 iframe 内の Audio は親に focus が移っても再生を継続する\r
  19  */\r
  20 \r
  21 var X_HTMLAudio_playTrigger =\r
  22                 6 <= X_UA[ 'iOS' ] ? 'loadeddata' :\r
  23                 X_UA[ 'iOS' ] < 5  ? 'stalled' :\r
  24                 X_UA[ 'iOS' ]      ? 'suspend' :\r
  25                 X_UA[ 'Safari' ] < 4 ? 'canplaythrough' :\r
  26                 X_UA[ 'ChromeWV' ]   ? 'canplaythrough' :\r
  27                 // Android 2.3.5(SBM101SH) では stalled は発生しない,,,　ので必ず loadeddata もチェックする\r
  28                 X_UA[ 'AOSP' ] ? 'stalled' :\r
  29                 X_UA[ 'OperaMobile' ] || X_UA[ 'OperaTablet' ] ? 'loadeddata' :\r
  30                         'loadeddata', //'canplay',\r
  31         X_HTMLAudio,\r
  32         \r
  33         // ended が発生しない timeupdate 内で play() を呼ぶ (未検証) 不具合確認は iOS4,6\r
  34         X_HTMLAudio_endedFixIOS     = X_UA[ 'iOS' ] < 7,\r
  35         // Android 2.3.5 で ended 時に audio.src='';audio.src=src;audio.load() を実施。 2.3.4 でも問題なし。\r
  36         X_HTMLAudio_endedFixAOSP2   = X_UA[ 'AOSP' ] < 3,\r
  37         // Android 3.1 で ended 時に src='';src=src を実施。\r
  38         X_HTMLAudio_endedFixAOSP3   = !X_HTMLAudio_endedFixAOSP2 && X_UA[ 'AOSP' ] < 4,\r
  39         // ended 時に play() を実施, currentTime が duration に張り付き更新されなければ  src='';src=src を実施。\r
  40         X_HTMLAudio_endedFixAOSP4   = 4 <= X_UA[ 'AOSP' ] || X_UA[ 'ChromeWV' ],\r
  41         \r
  42         // Opera Mobile 12 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
  43         X_HTMLAudio_currentTimeFix  = !!X_UA[ 'OperaMobile' ] || !!X_UA[ 'OperaTablet' ],\r
  44 \r
  45         X_HTMLAudio_volumeFix       = X_UA[ 'Chrome' ],\r
  46         /*\r
  47          * win opera12 volume, mute の変更が2度目以降できない\r
  48          */\r
  49         X_HTMLAudio_volumeEnabled   = !( X_UA[ 'WinPhone' ] && X_UA[ 'IE9' ] ) && !X_UA[ 'Opera' ],\r
  50         // Gecko PC + Android でseek時に再生がしばしば止まる問題の修正\r
  51         X_HTMLAudio_needPlayForSeek = X_UA[ 'Gecko' ],\r
  52         // \r
  53         X_HTMLAudio_pauseFix            = ( X_UA[ 'Windows' ] && 12 <= X_UA[ 'Opera' ] && 0 < ' XP XPSP2 2003|XP64'.indexOf( X_UA[ 'Windows' ] ) ), // XP + Opera12 のみ?\r
  54         /*\r
  55          * durationFix\r
  56          *  duration が取得できるタイミングが遅くそれまでは infinity(PC Opera12), NaN(WP9), 0(Android 標準ブラウザ ChromeWebView) が入っている\r
  57          * \r
  58          *   1. touch が不要の場合、自動で再生を開始して duration を取得するまで再生する\r
  59          *        -> 取得後に pause or 通常再生\r
  60          *   2. touch が必要な場合、タッチイベント内の audio.play() で duration 取得\r
  61          * \r
  62          *  PC Opera12\r
  63          *   1. loadeddata 等では duration が infinity で、再生後の durationchange 時に duration が判明する\r
  64          *   2. 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
  65          *   3. Opera12.17 Win32(XP) portable apps は勝手に再生が始まる、、、Win8+Opera では発生しない\r
  66          *        -> 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
  67          *        -> opera11、10.54 WinXP はまとも、、、 portable が怪しい??\r
  68          */\r
  69         X_HTMLAudio_need1stTouch        = X_UA[ 'iOS' ] || X_UA[ 'ChromeWV' ] || ( X_UA[ 'WinPhone' ] && X_UA[ 'IE9' ] ),       \r
  70         X_HTMLAudio_durationFix     = ( X_UA[ 'Windows' ] && 12 <= X_UA[ 'Opera' ] ) || X_UA[ 'ChromeWV' ] || ( X_UA[ 'WinPhone' ] && X_UA[ 'IE9' ] ),\r
  71         \r
  72         X_HTMLAudio_shortPlayFix        = X_UA[ 'AOSP' ]; // Android 4.1.1 でも遭遇(ただしm4a, mp3は優秀, oggはシークが乱れる)\r
  73         \r
  74         \r
  75 \r
  76 if( X_Audio_constructor ){\r
  77         \r
  78         X_HTMLAudio = X_AudioBase[ 'inherits' ](\r
  79                 'X.HTMLAudio',\r
  80                 X_Class.POOL_OBJECT,\r
  81                 {\r
  82                         _closed               : true,\r
  83                         _loaded               : false,\r
  84                         _ready            : false,              \r
  85                         _src                      : '',\r
  86                         \r
  87                         _currentFixStart  : 0,\r
  88                         _currentFixBegin  : 0,\r
  89 \r
  90                         _durationFixPhase : X_HTMLAudio_durationFix ? 1 : 0,\r
  91                         _durationFixSkip  : X_HTMLAudio_durationFix && !X_HTMLAudio_need1stTouch,                       \r
  92                         _lastCurrentTime  : 0,\r
  93 \r
  94                         _shortPlayFixON   : false,\r
  95                         _shortPlayFixTime : 0,\r
  96                         \r
  97                         _endedFixON               : false,\r
  98                         \r
  99                         _kickTimerID      : false, // 処理が混み入ると AOSP で音声が再生されない\r
 100                         _lastKickTime     : 0,\r
 101                         \r
 102                         'Constructor' : function( disatcher, source, option ){\r
 103                                 var raw;\r
 104                                 \r
 105                                 this.disatcher = disatcher || this;\r
 106                                 this._closed   = false;\r
 107                                 this._src          = source;\r
 108                                 \r
 109                                 if( X_HTMLAudio_shortPlayFix ){\r
 110                                         this._shortPlayFixON = X_URL_getEXT( source ) === 'm4a';\r
 111                                 };\r
 112                                 \r
 113                                 this.setState( option );\r
 114 \r
 115                                 if( option[ 'useVideo' ] ){\r
 116                                         raw = document.createElement( 'video' );\r
 117                                         raw.preload                   = 'none'; // auto, metadata, none\r
 118                                         raw.autoplay              = false, // no-auto\r
 119                                         raw.loop                          = false;\r
 120                                         raw.muted                         = false;\r
 121                                         raw.crossorigin       = option[ 'crossorigin' ] || ''; //crossorigin: "anonymous", X.URL.isSameDomain() で切り替え\r
 122                                         raw.style.cssText         = 'position:absolute;bottom:0;left:-50px;width:100px;height:100px;opacity:0;';\r
 123                                         raw.controls              = false;\r
 124                                         raw.WebKitPlaysInline = true;\r
 125                                         raw.src                       = source;\r
 126                                         X_elmBody.appendChild( raw );\r
 127                                 } else {\r
 128                                         raw = X_TEMP.rawAudio || new X_Audio_constructor( source );\r
 129                                         // X_Doc_create( 'audio', { src : source } )[ 'appendTo' ]( X.Doc.body );\r
 130                                         raw.autobuffer = raw.autoplay = false;\r
 131                                 };\r
 132                                 \r
 133                                 this[ '_rawObject' ] = raw;\r
 134                                 \r
 135                                 this[ 'listen' ]( [\r
 136                                                 X_EVENT_KILL_INSTANCE,\r
 137                                                 X_HTMLAudio_playTrigger,\r
 138                                                 //'loadstart', 'load',\r
 139                                                 'progress', 'error',\r
 140                                                 // 'suspend', 'abort', 'emptied', 'stalled',\r
 141                                                 // 'play', 'pause', 'seeked', 'ratechange', 'volumechange',\r
 142                                                 'loadedmetadata', 'loadeddata', 'canplay', 'canplaythrough',\r
 143                                                 'playing', 'waiting', 'seeking',\r
 144                                                 'durationchange', 'timeupdate', 'ended' ] );\r
 145 \r
 146                                 if( X_TEMP.rawAudio ){\r
 147                                         raw.src = source;\r
 148                                         raw.load(); // AOSP2 で必要\r
 149                                         delete X_TEMP.rawAudio;\r
 150                                 };\r
 151                         },\r
 152                         \r
 153                         handleEvent : function( e ){\r
 154                                 var raw    = this[ '_rawObject' ],\r
 155                                         actualEnded = e.type === 'ended',\r
 156                                         ended       = actualEnded,\r
 157                                         ready       = e.type === X_HTMLAudio_playTrigger,\r
 158                                         eventType, duration, end, now;\r
 159                                 \r
 160                                 // global に公開\r
 161                                 //window[ '__rawAudio' ] = this[ '_rawObject' ];\r
 162                                 \r
 163                                 e.type !== 'timeupdate' && console.log( ' > ' + e.type );\r
 164                                         \r
 165                                 switch( e.type ){\r
 166 \r
 167                                         case X_EVENT_KILL_INSTANCE :\r
 168                                                 // 【javascript】モバイル向けブラウザでも音を鳴らしたい【WebAudio】\r
 169                                                 // http://ingaouhou.com/archives/3633\r
 170                                                 // ・使い終わったインスタンスはload()しておくとやや安定\r
 171                                                 this.playing && this.actualPause();\r
 172                                                 delete this._closed;\r
 173                                                 delete this._loaded;\r
 174                                                 \r
 175                                                 raw.src = '';\r
 176                                                 raw.load();\r
 177                                                 \r
 178                                                 // removeChild for video\r
 179                                                 break;\r
 180 \r
 181                                         //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
 182                                                 //break;\r
 183                                         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
 184                                                 // console.log( e.loaded + ' ' + e.total * 100 + '%' );\r
 185                                                 // iem9 で常に0 raw.networkState;\r
 186                                                 // 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
 187                                                 //console.log( 'buffered.end ' + raw.buffered && raw.buffered.end(0) ); \r
 188                                                 break;\r
 189                                         \r
 190                                         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
 191                                                 if( !this._endedFixON ){\r
 192                                                         ready = true;\r
 193                                                 };\r
 194                                         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
 195                                                 if( X_HTMLAudio_durationFix && !X_HTMLAudio_need1stTouch && this._durationFixPhase === 1 ){\r
 196                                                         console.log( '▲ DurationFix の開始 @' + e.type );\r
 197                                                         this._durationFixPhase = 2;\r
 198                                                         raw.play();\r
 199                                                         raw.currentTime = 0; // 必要！\r
 200                                                 };\r
 201                                         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
 202                                                 if( this._endedFixON ){\r
 203                                                         console.log( '▽ onEndedFix の終了 @' + e.type  );\r
 204                                                         this._endedFixON = false;\r
 205                                                         this.actualPlay();\r
 206                                                 };\r
 207                                         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
 208                                         case 'durationchange' : //  duration属性が更新された場合に発生\r
 209                                                 if( !this.duration ){\r
 210                                                         duration = raw.duration;\r
 211                                                 };\r
 212                                                 break;\r
 213         \r
 214                                         // TODO firefox で 短い音声でtimeupdate, ended が発火しない <- 最後の音に無音部分を追加する\r
 215                                         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
 216                                                 if( this._durationFixPhase & 3 ){ // 1 or 2\r
 217                                                         duration = raw.duration;\r
 218                                                 } else\r
 219                                                 if( raw.currentTime === this._lastCurrentTime ){\r
 220                                                         eventType = X_EVENT_MEDIA_WAITING;\r
 221                                                 } else {\r
 222                                                         this._lastCurrentTime = raw.currentTime;\r
 223 \r
 224                                                         if( this.playing ){\r
 225                                                                 end = X_Audio_getEndTime( this ) + this._shortPlayFixTime;\r
 226                                                                 now = this.getActualCurrentTime();\r
 227                                                                 //console.log( now + ' / ' + end );\r
 228                                                                 if( 0 + end <= 0 + now ){ // 0+ なぜか iem9 で必要,,,\r
 229                                                                         if( this.autoLoop ){\r
 230                                                                                 console.log( '☆★☆ 曲の最後に到達 @timeupdate now-end:' + ( now - end ) );\r
 231                                                                                 ended = true;\r
 232                                                                                 if( X_HTMLAudio_endedFixIOS ) actualEnded = true;\r
 233                                                                         } else {\r
 234                                                                                 this.actualPause();\r
 235                                                                                 eventType = X_EVENT_MEDIA_ENDED;\r
 236                                                                         };\r
 237                                                                 } else {\r
 238                                                                         eventType = X_EVENT_MEDIA_PLAYING;\r
 239                                                                 };\r
 240                                                         };\r
 241                                                 };\r
 242                                                 break;\r
 243         \r
 244                                         //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
 245                                                 // Android2 で ready 扱い?\r
 246                                         //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
 247                                                 // iOS で ready 扱い\r
 248                                         //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
 249                                         //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
 250                                         //      break;\r
 251                                                 \r
 252                                         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
 253                                                 // Opera12 src = '' で error が発生、無視する\r
 254                                                 // eventType = X_EVENT_ERROR;\r
 255                                                 break;\r
 256                                                 \r
 257                                         case 'playing' :                //      再生が開始された場合に発生\r
 258                                                 if( X_HTMLAudio_volumeFix ){\r
 259                                                         raw.volume = this.gain;\r
 260                                                 };\r
 261                                                 if( X_HTMLAudio_currentTimeFix ){\r
 262                                                         this._currentFixStart = X_Timer_now(); // 正確な再生開始時間に補正\r
 263                                                 };\r
 264                                                 eventType = !this._durationFixSkip && !this._endedFixON ? X_EVENT_MEDIA_PLAYING : X_EVENT_MEDIA_WAITING;\r
 265                                         //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
 266                                         //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
 267                                         //case 'seeked' : \r
 268                                         //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
 269                                         //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
 270                                                 break;\r
 271                                         \r
 272                                         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
 273                                                 eventType = X_EVENT_MEDIA_WAITING;\r
 274                                                 break;\r
 275                                         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
 276                                                 eventType = X_EVENT_MEDIA_SEEKING;\r
 277                                                 break;\r
 278                                 };\r
 279                                 \r
 280                                 // duration は Infinity, NaN, 0 の場合があるため、これを除外する\r
 281                                 if( 0 < duration && X_Type_isFinite( duration ) ){\r
 282                                         this.duration = duration * 1000;\r
 283 \r
 284                                         if( this._durationFixPhase === 2 ){\r
 285                                                 console.log( '▼ DurationFix の終了 @' + e.type );\r
 286                                                 this._durationFixPhase = 4;\r
 287                                                 \r
 288                                                 ready = true;\r
 289                                                 \r
 290                                                 if( this.autoplay || this._loaded ){\r
 291                                                         console.log( '☆ 再生 <- DurationFix の終了' );\r
 292                                                         this._durationFixSkip = false;\r
 293                                                         this.actualPlay();\r
 294                                                 } else\r
 295                                                 if( X_HTMLAudio_pauseFix ){\r
 296                                                         console.log( '☆ PAUSE <- DurationFix の終了' );\r
 297                                                         //raw.src = '';\r
 298                                                         //raw.load();\r
 299                                                         this.actualPause();                             \r
 300                                                 };\r
 301                                         } else\r
 302                                         if( this._durationFixPhase ){\r
 303                                                 this._durationFixPhase = 4;\r
 304                                         };                                      \r
 305                                 };\r
 306 \r
 307                                 this._loaded  = this._loaded || ready;\r
 308 \r
 309                                 // \r
 310                                 if( ended ){\r
 311                                         if( !this._closed && this.autoLoop ){\r
 312                                                 if( !( this.disatcher[ 'dispatch' ]( X_EVENT_MEDIA_BEFORE_LOOP ) & X_CALLBACK_PREVENT_DEFAULT ) ){\r
 313                                                         this.looped = true;\r
 314                                                         this.disatcher[ 'dispatch' ]( X_EVENT_MEDIA_LOOPED );\r
 315                                                         ( X_HTMLAudio_endedFixAOSP3 || X_HTMLAudio_endedFixAOSP4 || X_HTMLAudio_endedFixIOS ) && actualEnded && console.log( '☆★☆ 音声の継続用の play() @ended' );\r
 316                                                         this.actualPlay(\r
 317                                                                 ( X_HTMLAudio_endedFixAOSP4 || X_HTMLAudio_endedFixIOS ) && actualEnded,\r
 318                                                                 ( X_HTMLAudio_endedFixAOSP3 || X_HTMLAudio_endedFixAOSP2 ) && actualEnded );\r
 319                                                 };\r
 320                                         } else {\r
 321                                                 this.seekTime = 0;\r
 322                                                 delete this.playing;\r
 323                                                 this.disatcher[ 'dispatch' ]( X_EVENT_MEDIA_ENDED );\r
 324                                         };\r
 325                                 } else\r
 326                                 if( this._loaded && this.duration && !this._ready ){\r
 327                                         this._ready = true;\r
 328                                         this.autoplay && X_Timer_once( 16, this, this.play );\r
 329                                         this.disatcher[ 'asyncDispatch' ]( X_EVENT_READY );\r
 330                                         console.log( '> Audio Loaded!! ' + e.type + ' d:' + ( this.duration | 0 ) );\r
 331                                 } else\r
 332                                 if( eventType ){\r
 333                                         this.disatcher[ 'dispatch' ]( eventType );\r
 334                                         eventType === X_EVENT_ERROR && this[ 'kill' ]();\r
 335                                 };\r
 336                         },\r
 337 \r
 338                         actualPlay : function( forcePlay, forceReload ){\r
 339                                 var raw = this[ '_rawObject' ],\r
 340                                         begin, end;\r
 341                                 \r
 342                                 // もし kill 後に autoplayTimer で呼ばれても、_closed==true なので平気\r
 343                                 if( this._closed ) return;\r
 344                                 \r
 345                                 \r
 346                                 if( !raw.src ){ // X_HTMLAudio_pauseFix によって src が空になっている\r
 347                                         console.log( '○ 削除された audio.src の復帰' );\r
 348                                         raw.src = this._src;\r
 349                                         //return;\r
 350                                 };                              \r
 351                                 \r
 352                                 if( !this._ready && ( !X_HTMLAudio_durationFix || !X_HTMLAudio_need1stTouch ) ){\r
 353                                         this.autoplay = true;\r
 354                                         return;\r
 355                                 };\r
 356 \r
 357                                 if( X_HTMLAudio_durationFix && X_HTMLAudio_need1stTouch && this._durationFixPhase === 1 ){\r
 358                                         console.log( '▲ DurationFix の開始(タッチ用)' );\r
 359                                         this._durationFixPhase = 2;\r
 360                                 };\r
 361 \r
 362                                 end   = X_Audio_getEndTime( this );\r
 363                                 begin = X_Audio_getStartTime( this, end, true );\r
 364 \r
 365                                 this._lastCurrentTime = begin / 1000;\r
 366 \r
 367                                 if( this._shortPlayFixON ){\r
 368                                         this._shortPlayFixTime = ( 1000 < end - begin ) ? 200 : 400;\r
 369                                         if( this.duration < end + this._shortPlayFixTime ){\r
 370                                                 this._shortPlayFixTime = this.duration - end;\r
 371                                         };\r
 372                                 };\r
 373 \r
 374                                 if( this._durationFixSkip || this._endedFixON ){\r
 375                                         console.log( '☆ audio.play をスキップ ' + begin + ' -> ' + end + ' crt:' + ( raw.currentTime | 0 ) );\r
 376                                 } else {\r
 377                                         if( !this.playing ){\r
 378                                                 if( X_HTMLAudio_volumeFix ){\r
 379                                                         raw.volume = 0;\r
 380                                                 } else {\r
 381                                                         raw.volume = X_HTMLAudio_volumeEnabled ? this.gain : 1;\r
 382                                                 };\r
 383                                                 raw.play();\r
 384                                                 this.playing = true;\r
 385                                                 \r
 386                                                 if( X_UA[ 'AOSP' ] && !this._kickTimerID ){\r
 387                                                         this._kickTimerID = X_Timer_add( 100, 0, this, this._kick );\r
 388                                                 };\r
 389                                         } else\r
 390                                         if( X_HTMLAudio_needPlayForSeek || forcePlay ){\r
 391                                                 raw.play();\r
 392                                                 console.log( '[HTMLAudio] currentTime より先.' );\r
 393                                         };\r
 394                                         \r
 395                                         //http://himaxoff.blog111.fc2.com/blog-entry-97.html\r
 396                                         //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
 397                                         //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
 398                                         raw.currentTime = this._lastKickTime = this._lastCurrentTime;\r
 399                                         console.log( '[HTMLAudio] play ' + begin + ' -> ' + end + ' crt:' + ( raw.currentTime | 0 ) + ' last:' + this._lastCurrentTime );\r
 400                                         \r
 401                                         // Android4.0.5 で ended イベント時に currentTime が duration に張り付いたまま変更できない\r
 402                                         if( forceReload || ( X_HTMLAudio_endedFixAOSP4 && raw.duration && raw.currentTime === raw.duration ) ){\r
 403                                                 raw.src          = '';\r
 404                                                 raw.src          = this._src;\r
 405                                                 this.playing     = false;\r
 406                                                 this._endedFixON = true;\r
 407                                                 console.log( '△ onEndedFix の開始' );\r
 408                                                 raw.currentTime  = this._lastCurrentTime;\r
 409                                                 this.disatcher[ 'dispatch' ]( X_EVENT_MEDIA_WAITING );\r
 410                                                 X_HTMLAudio_endedFixAOSP2 && raw.load();\r
 411                                         };                                                      \r
 412                                 };\r
 413 \r
 414                                 if( X_HTMLAudio_currentTimeFix ){\r
 415                                         this._currentFixBegin = begin;\r
 416                                         this._currentFixStart = X_Timer_now();\r
 417                                 };\r
 418                         },\r
 419                         \r
 420                                 _kick : function(){\r
 421                                         var raw = this[ '_rawObject' ];\r
 422                                         \r
 423                                         console.log( ' >> KICK ? ct:' + ( raw.currentTime ) + ' lkt:' + this._lastKickTime );\r
 424                                         if( this.playing && raw.currentTime === this._lastKickTime ){\r
 425                                                 this.disatcher[ 'dispatch' ]( X_EVENT_MEDIA_WAITING );\r
 426                                                 console.log( ' >> KICK !!' );\r
 427                                                 raw.play();\r
 428                                         } else {\r
 429                                                 delete this._kickTimerID;\r
 430                                                 return X_CALLBACK_UN_LISTEN;\r
 431                                         };\r
 432                                 },\r
 433                         \r
 434                         actualPause : function(){\r
 435                                 console.log( '[HTMLAudio] pause' );\r
 436                                 \r
 437                                 this.seekTime = this.getActualCurrentTime();\r
 438 \r
 439                                 delete this._currentFixStart;\r
 440 \r
 441                                 !this[ '_rawObject' ].error && this[ '_rawObject' ].pause();\r
 442                                 \r
 443                                 if( X_HTMLAudio_pauseFix ){\r
 444                                         this[ '_rawObject' ].src = '';\r
 445                                         if( X_HTMLAudio_durationFix ){\r
 446                                                 delete this._durationFixPhase;\r
 447                                                 delete this._durationFixSkip;\r
 448                                         };\r
 449                                 };\r
 450                                 delete this.playing;\r
 451                         },\r
 452                         \r
 453                         getActualCurrentTime : function(){\r
 454                                 return ( X_HTMLAudio_currentTimeFix ?\r
 455                                                         X_Timer_now() - this._currentFixStart + this._currentFixBegin :\r
 456                                                         this[ '_rawObject' ].currentTime * 1000 | 0 );\r
 457                         },\r
 458                 /*\r
 459                 http://www.w3schools.com/tags/av_prop_error.asp\r
 460                 1 = MEDIA_ERR_ABORTED - fetching process aborted by user\r
 461                 2 = MEDIA_ERR_NETWORK - error occurred when downloading\r
 462                 3 = MEDIA_ERR_DECODE - error occurred when decoding\r
 463                 4 = MEDIA_ERR_SRC_NOT_SUPPORTED - audio/video not supported\r
 464                 */                      \r
 465                         getActualError : function(){\r
 466                                 return this[ '_rawObject' ].error || 0;\r
 467                         },\r
 468                         \r
 469                         afterUpdateState : function( result ){\r
 470                                 if( result & 3 ){ // seek\r
 471                                         this.actualPlay();\r
 472                                 } else\r
 473                                 if( ( result & 4 ) && X_HTMLAudio_volumeEnabled ){\r
 474                                    this[ '_rawObject' ].volume = this.gain;\r
 475                                 };                              \r
 476                         }\r
 477         \r
 478                 }\r
 479         );\r
 480         \r
 481         X_HTMLAudio && X_Audio_BACKENDS.push(\r
 482                 {\r
 483                         backendID   : 2,\r
 484                         \r
 485                         backendName : 'HTMLAudio',\r
 486                         \r
 487                         canPlay : X_Audio_codecs,\r
 488                 /*\r
 489                  * 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
 490                  * https://developer.mozilla.org/ja/docs/Web/HTML/Supported_media_formats\r
 491                  * \r
 492                  * 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
 493                  * http://sothis.blog.so-net.ne.jp/2010-10-27\r
 494                  * 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
 495                  * \r
 496                  * IE9 の HTML5 Audio について\r
 497                  * http://kentablog.cluscore.com/2011/05/ie9-html5-audio.html\r
 498                  * 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
 499                  * 2.クロスドメインアクセスには、「clientaccesspolicy.xml」か「crossdomain.xml」が必要\r
 500                  * 3.wav が不可\r
 501                  * \r
 502                  * IE9でHTML5 autio タグが無効になる\r
 503                  * http://bbs.wankuma.com/index.cgi?mode=al2&namber=64886&KLOG=109\r
 504                  *  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
 505                  *  createElement等で動的生成すると、よろしくない\r
 506                  * \r
 507                  * media-can-play-wav-audio.html\r
 508                  * https://github.com/adobe/webkit/blob/master/LayoutTests/media/media-can-play-wav-audio.html\r
 509                  * testExpected("audio.canPlayType('audio/wav; codecs=1')", "probably");\r
 510                  * \r
 511                  * HTML5 audioタグ ブラウザ間の違い\r
 512                  * 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
 513                  *  - volume, muted iPhone(iOS4-6)、Android(2.3.6)では動作せず。\r
 514                  *  - 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
 515                  */     \r
 516                         detect : function( proxy, source, ext ){\r
 517                                 proxy[ 'asyncDispatch' ]( { type : X_EVENT_COMPLETE, canPlay : X_Audio_codecs[ ext ] } );\r
 518                         },\r
 519                         \r
 520                         klass : X_HTMLAudio\r
 521                         \r
 522                 } );\r
 523 \r
 524 /*\r
 525  * \r
 526  * howler.js\r
 527  *       codecs = {\r
 528           mp3: !!audioTest.canPlayType('audio/mpeg;').replace(/^no$/, ''),\r
 529           opus: !!audioTest.canPlayType('audio/ogg; codecs="opus"').replace(/^no$/, ''),\r
 530           ogg: !!audioTest.canPlayType('audio/ogg; codecs="vorbis"').replace(/^no$/, ''),\r
 531           wav: !!audioTest.canPlayType('audio/wav; codecs="1"').replace(/^no$/, ''),\r
 532           aac: !!audioTest.canPlayType('audio/aac;').replace(/^no$/, ''),\r
 533           m4a: !!(audioTest.canPlayType('audio/x-m4a;') || audioTest.canPlayType('audio/m4a;') || audioTest.canPlayType('audio/aac;')).replace(/^no$/, ''),\r
 534           mp4: !!(audioTest.canPlayType('audio/x-mp4;') || audioTest.canPlayType('audio/mp4;') || audioTest.canPlayType('audio/aac;')).replace(/^no$/, ''),\r
 535           weba: !!audioTest.canPlayType('audio/webm; codecs="vorbis"').replace(/^no$/, '')\r
 536         };\r
 537  */\r
 538         \r
 539 };\r
 540 \r
 541 \r
 542 \r
 543 \r
 544 \r