0.6.x/js/07_audio/01_XWebAudio.js

   1
   2 var X_Audio_WebAudio_context = !X_UA[ 'iPhone_4s' ]  && !X_UA[ 'iPad_2Mini1' ]  && !X_UA[ 'iPod_4' ]  &&
   3                                                                 !( X_UA[ 'Gecko' ] && X_UA[ 'Android' ] ) &&
   4                                                                 ( window.AudioContext || window.webkitAudioContext ),
   5         X_Audio_BUFFER_LIST      = [],
   6         X_Audio_WebAudioWrapper,
   7         X_Audio_BufferLoader;
   8
   9 /*
  10  * iPhone 4s 以下、iPad2以下、iPad mini 1以下, iPod touch 4G 以下は不可
  11  */
  12 if( X_Audio_WebAudio_context ){
  13
  14         X_Audio_WebAudio_context = new X_Audio_WebAudio_context;
  15
  16         X_Audio_BufferLoader = X_EventDispatcher[ 'inherits' ](
  17                 'X.AV.WebAudioBufferLoader',
  18                 X_Class.POOL_OBJECT,
  19                 {
  20                         url             : '',
  21             xhr             : null,
  22             onDecodeSuccess : null,
  23             onDecodeError   : null,
  24
  25             buffer          : null,
  26             error           : 0,
  27             webAudioList    : null,
  28
  29                         Constructor : function( webAudio, url ){
  30                                 this.webAudioList = [ webAudio ];
  31                                 this.url = url;
  32                                 this.xhr = X.Net( { 'xhr' : url, 'dataType' : 'arraybuffer' } )
  33                                                                         [ 'listen' ]( X_EVENT_PROGRESS, this )
  34                                                                         [ 'listenOnce' ]( [ X_EVENT_SUCCESS, X_EVENT_COMPLETE ], this );
  35                         },
  36
  37                         handleEvent : function( e ){
  38                                 switch( e.type ){
  39                                         case X_EVENT_PROGRESS :
  40                                                 this[ 'dispatch' ]( { type : 'progress', 'percent' : e[ 'percent' ] } );
  41                                                 return;
  42
  43                                         case X_EVENT_SUCCESS :
  44                                         // TODO 旧api
  45                                         // https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API/Porting_webkitAudioContext_code_to_standards_based_AudioContext
  46
  47                                         // http://qiita.com/sou/items/5688d4e7d3a37b4e2ff1
  48                                         // iOS 7.1 で decodeAudioData に処理が入った瞬間にスクリーンを長押しする（スクロールを繰り返す）と
  49                                         // decoeAudioData の処理がキャンセルされることがある（エラーやコールバックの発火もなく、ただ処理が消滅する）。
  50                                         // ただし iOS 8.1.2 では エラーになる
  51                                                 if( X_Audio_WebAudio_context.createBuffer && X_UA[ 'iOS' ] < 8 ){
  52                                                         this._onDecodeSuccess( X_Audio_WebAudio_context.createBuffer( e.response, false ) );
  53                                                 } else
  54                                                 if( X_Audio_WebAudio_context.decodeAudioData ){
  55                                                         X_Audio_WebAudio_context.decodeAudioData( e.response,
  56                                                                 this.onDecodeSuccess = X_Callback_create( this, this._onDecodeSuccess ),
  57                                                                 this.onDecodeError   = X_Callback_create( this, this._onDecodeError ) );
  58                                                 } else {
  59                                                         this._onDecodeSuccess( X_Audio_WebAudio_context.createBuffer( e.response, false ) );
  60                                                 };
  61                                                 break;
  62
  63                                         case X_EVENT_COMPLETE :
  64                                                 this.error = 1;
  65                                                 this[ 'asyncDispatch' ]( X_EVENT_COMPLETE );
  66                                                 break;
  67                                 };
  68                                 this.xhr[ 'unlisten' ]( [ X_EVENT_PROGRESS, X_EVENT_SUCCESS, X_EVENT_COMPLETE ], this );
  69                                 delete this.xhr;
  70                         },
  71
  72                                 _onDecodeSuccess : function( buffer ){
  73                                         console.log( 'WebAudio decode success!' );
  74
  75                                         this.onDecodeSuccess && this._onDecodeComplete();
  76
  77                         if ( !buffer ) {
  78                                 this.error = 2;
  79                             this[ 'asyncDispatch' ]( X_EVENT_COMPLETE );
  80                             return;
  81                         };
  82
  83                         this.buffer   = buffer;
  84
  85                                         this[ 'asyncDispatch' ]( X_EVENT_COMPLETE );
  86
  87                         console.log( 'WebAudio decoded!' );
  88                                 },
  89
  90                                 _onDecodeError : function(){
  91                                         console.log( 'WebAudio decode error!' );
  92                                         this._onDecodeComplete();
  93                                         this.error = 2;
  94                                         this[ 'asyncDispatch' ]( X_EVENT_COMPLETE );
  95                                 },
  96
  97                                 _onDecodeComplete : function(){
  98                                         X_Callback_correct( this.onDecodeSuccess );
  99                                         delete this.onDecodeSuccess;
 100                                         X_Callback_correct( this.onDecodeError );
 101                                         delete this.onDecodeError;
 102                                 },
 103
 104                         unregister : function( webAudio ){
 105                                 var list = this.webAudioList,
 106                                         i    = list.indexOf( webAudio );
 107                                 if( 0 < i ){
 108                                         list.splice( i, 1 );
 109                                         if( list.length ){
 110                                                 this.xhr && this.xhr[ 'kill' ]();
 111                                                 this[ 'kill' ]();
 112                                         };
 113                                 };
 114                         }
 115
 116                 }
 117         );
 118
 119
 120         X_Audio_WebAudioWrapper = X_Audio_AbstractAudioBackend[ 'inherits' ](
 121                 'X.AV.WebAudioWrapper',
 122                 X_Class.POOL_OBJECT,
 123                 {
 124
 125                         loader          : null,
 126
 127                         _startPos       : 0,
 128                         _endPosition    : 0,
 129                         _startTime      : 0,
 130             _timerID        : 0,
 131             _interval       : 0,
 132                 buffer          : null,
 133                 source          : null,
 134             gainNode        : null,
 135             _onended        : null,
 136
 137                         Constructor : function( target, url, option ){
 138                                 var i = 0,
 139                                         l = X_Audio_BUFFER_LIST.length,
 140                                         loader;
 141
 142                                 for( ; i < l; ++i ){
 143                                         loader = X_Audio_BUFFER_LIST[ i ];
 144                                         if( loader.url === url ){
 145                                                 this.loader = loader;
 146                                                 loader.webAudioList.push( this );
 147                                                 break;
 148                                         };
 149                                 };
 150
 151                                 if( !this.loader ){
 152                                         this.loader = loader = new X_Audio_BufferLoader( this, url );
 153                                 };
 154
 155                                 this.target  = target || this;
 156
 157                                 this.setState( option );
 158
 159                                 this[ 'listenOnce' ]( X_EVENT_KILL_INSTANCE, this.onKill );
 160
 161                                 if( loader.buffer || loader.error ){
 162                                         this._onLoadBufferComplete();
 163                                 } else {
 164                                         loader[ 'listenOnce' ]( X_EVENT_COMPLETE, this, this._onLoadBufferComplete );
 165                                 };
 166                         },
 167
 168                         onKill : function(){
 169                                 this.loader[ 'unlisten' ]( X_EVENT_COMPLETE, this, this._onLoadBufferComplete )
 170                                         .unregister( this );
 171
 172                                 delete this.buffer;
 173
 174                                 this.playing  && this.actualPause();
 175                     this.source   && this._sourceDispose();
 176
 177                     this._onended && X_Callback_correct( this._onended );
 178
 179                     this.gainNode && this.gainNode.disconnect();
 180                         },
 181                                 _onLoadBufferComplete : function( e ){
 182                                         var loader = this.loader,
 183                                                 buffer = loader.buffer;
 184
 185                                         e && loader[ 'unlisten' ]( X_EVENT_COMPLETE, this, this._onLoadBufferComplete );
 186
 187                         if ( !buffer ) {
 188                                 this.error = loader.error;
 189
 190                             this.target[ 'dispatch' ]({
 191                                                                 type    : X_EVENT_ERROR,
 192                                                                 error   : loader.error,
 193                                                                 message : loader.error === 1 ?
 194                                                                                         'load buffer network error' :
 195                                                                                         'buffer decode error'
 196                                                         });
 197                                                 this[ 'kill' ]();
 198                             return;
 199                         };
 200
 201                         this.buffer   = buffer;
 202                         this.duration = buffer.duration * 1000;
 203
 204                                         this.target[ 'asyncDispatch' ]( X_EVENT_READY );
 205
 206                         this.autoplay && X_Timer_once( 16, this, this.play );
 207
 208                                 },
 209
 210                         actualPlay : function(){
 211                                 var begin, end;
 212
 213                     if( !this.buffer ){
 214                         this.autoplay = true;
 215                         return;
 216                     };
 217
 218                                 end   = X_AudioWrapper_getEndTime( this );
 219                                 begin = X_AudioWrapper_getStartTime( this, end, true );
 220
 221                                 console.log( '[WebAudio] play ' + begin + ' -> ' + end );
 222
 223                                 if( this.source ) this._sourceDispose();
 224                                 if( !this.gainNode ){
 225                                         this.gainNode = X_Audio_WebAudio_context.createGain ? X_Audio_WebAudio_context.createGain() : X_Audio_WebAudio_context.createGainNode();
 226                         this.gainNode.connect( X_Audio_WebAudio_context.destination );
 227                                 };
 228                     this.source        = X_Audio_WebAudio_context.createBufferSource();
 229                     this.source.buffer = this.buffer;
 230                     this.source.connect( this.gainNode );
 231
 232                     this.gainNode.gain.value = this.gain;
 233
 234                     // おかしい、stop 前に外していても呼ばれる、、、@Firefox33.1
 235                     // 破棄された X.Callback が呼ばれて、obj.proxy() でエラーになる。Firefox では、onended は使わない
 236                 if( false && this.source.onended !== undefined ){
 237                         //console.log( '> use onended' );
 238                         this.source.onended = this._onended || ( this._onended = X_Callback_create( this, this._onEnded ) );
 239                 } else {
 240                         this._timerID && X_Timer_remove( this._timerID );
 241                                         this._timerID = X_Timer_once( end - begin, this, this._onEnded );
 242                 };
 243
 244                     if( this.source.start ){
 245                         this.source.start( 0, begin / 1000, end / 1000 );
 246                     } else {
 247                         this.source.noteGrainOn( 0, begin / 1000, end / 1000 );
 248                     };
 249
 250                     this.playing      = true;
 251                     this._startPos    = begin;
 252                     this._endPosition = end;
 253                     this._startTime   = X_Audio_WebAudio_context.currentTime * 1000;
 254                     this._interval    = this._interval || X_Timer_add( 1000, 0, this, this._onInterval );
 255                         },
 256
 257                                 _sourceDispose : function(){
 258                             this.source.disconnect();
 259                             delete this.source.onended;
 260                             delete this.source;
 261                         },
 262
 263                                 _onInterval : function(){
 264                                         if( !this.playing ){
 265                                                 delete this._interval;
 266                                                 return X_Callback_UN_LISTEN;
 267                                         };
 268                                         this.target[ 'dispatch' ]( X_EVENT_MEDIA_PLAYING );
 269                                 },
 270
 271                                 _onEnded : function(){
 272                                         var time;
 273                                         delete this._timerID;
 274
 275                             if( this.playing ){
 276                                 time = X_Audio_WebAudio_context.currentTime * 1000 - this._startTime - this._endPosition + this._startPos | 0;
 277                                 //console.log( '> onEnd ' + ( this.playing && ( X_Audio_WebAudio_context.currentTime * 1000 - this._startTime ) ) + ' < ' + ( this._endPosition - this._startPos ) );
 278                                 if( this._onended ){
 279                                         // Firefox 用の対策,,,
 280                                         if( time < 0 ) return;
 281                                 } else {
 282                                         if( time < 0 ){
 283                                                 console.log( '> onEnd crt:' + ( X_Audio_WebAudio_context.currentTime * 1000 ) + ' startTime:' + this._startTime +
 284                                                         ' from:' + this._startPos + ' to:' + this._endPosition );
 285                                                 this._timerID = X_Timer_once( -time, this, this._onEnded );
 286                                                 return;
 287                                         };
 288                                 };
 289
 290                                 if( this.autoLoop ){
 291                                         if( !( this.target[ 'dispatch' ]( X_EVENT_MEDIA_BEFORE_LOOP ) & X_Callback_PREVENT_DEFAULT ) ){
 292                                                 this.looped = true;
 293                                                 this.target[ 'dispatch' ]( X_EVENT_MEDIA_LOOPED );
 294                                                 this.actualPlay();
 295                                         };
 296                                 } else {
 297                                         this.actualPause();
 298                                         this.target[ 'dispatch' ]( X_EVENT_MEDIA_ENDED );
 299                                 };
 300                             };
 301                                 },
 302
 303                         actualPause : function(){
 304                                 if( !this.playing ) return this;
 305
 306                                 console.log( '[WebAudio] pause' );
 307
 308                                 this.seekTime = this.getActualCurrentTime();
 309
 310                     this._timerID && X_Timer_remove( this._timerID );
 311                                 delete this._timerID;
 312                                 delete this.playing;
 313
 314                     if( this.source ){
 315                         if( this.source.onended ) delete this.source.onended;
 316
 317                         this.source.stop ?
 318                                 this.source.stop( 0 ) : this.source.noteOff( 0 );
 319                     };
 320                         },
 321
 322                         getActualCurrentTime : function(){
 323                                 return X_Audio_WebAudio_context.currentTime * 1000 - this._startTime + this._startPos | 0;
 324                         },
 325
 326                         afterUpdateState : function( result ){
 327                                 if( result & 2 || result & 1 ){ // seek
 328                         this.actualPlay();
 329                                 } else
 330                                 if( result & 4 ){
 331                        this.gainNode.gain.value = this.gain;
 332                                 };
 333                         }
 334
 335                 }
 336         );
 337
 338         /*
 339          * http://qiita.com/sou/items/5688d4e7d3a37b4e2ff1
 340          * L-01F 等の一部端末で Web Audio API の再生結果に特定条件下でノイズが混ざることがある。
 341          * 描画レート（描画 FPS）が下がるとノイズが混ざり始め、レートを上げると再生結果が正常になるというもので、オーディオ処理が描画スレッドに巻き込まれているような動作を見せる。
 342          */
 343         if( X_UA[ 'Android' ] && X_UA[ 'Chrome' ] ){
 344                 X_Node_systemNode.create( 'div', { id : 'fps-slowdown-make-sound-noisy' } );
 345         };
 346
 347         X_Audio_BACKENDS.push(
 348                 {
 349                         backendName : 'Web Audio',
 350
 351                         //
 352                         detect : function( proxy, source, ext ){
 353                                 proxy[ 'asyncDispatch' ]( { type : X_EVENT_COMPLETE, canPlay : X_Audio_codecs[ ext ] } );
 354                         },
 355
 356                         klass : X_Audio_WebAudioWrapper
 357                 }
 358         );
 359 };