diff --git a/dist/jsmediatags.js b/dist/jsmediatags.js
index a6baf3a..1431fc0 100644
--- a/dist/jsmediatags.js
+++ b/dist/jsmediatags.js
@@ -1157,7 +1157,7 @@ function () {
 
         var unsyncData;
 
-        if (flags && flags.format.unsynchronisation) {
+        if (flags && flags.format.unsynchronisation && !id3header.flags.unsynchronisation) {
           frameData = this.getUnsyncFileReader(frameData, frameDataOffset, frameSize);
           frameDataOffset = 0;
           frameSize = frameData.getSize();
diff --git a/dist/jsmediatags.min.js b/dist/jsmediatags.min.js
index c3706a5..75cae50 100644
--- a/dist/jsmediatags.min.js
+++ b/dist/jsmediatags.min.js
@@ -1,33 +1,33 @@
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+0,0,{offset:f,data:c});else{var k=this._fileData[g.startIx],r=this._fileData[g.endIx];b=b<r.offset+r.data.length-1;var a={offset:Math.min(f,k.offset),data:c};f>k.offset&&(f=this._sliceData(k.data,0,f-k.offset),a.data=this._concatData(f,c));b&&(f=this._sliceData(a.data,0,r.offset-a.offset),a.data=this._concatData(f,r.data));this._fileData.splice(g.startIx,g.endIx-g.startIx+1,a)}}},{key:"_concatData",value:function(f,c){if("undefined"!==typeof ArrayBuffer&&ArrayBuffer.isView&&ArrayBuffer.isView(f)){var b=
+new f.constructor(f.length+c.length);b.set(f,0);b.set(c,f.length);return b}return f.concat(c)}},{key:"_sliceData",value:function(f,c,b){return f.slice?f.slice(c,b):f.subarray(c,b)}},{key:"_getChunkRange",value:function(f,c){for(var b,g,k=-1,r=-1,a=0,e=0;e<this._fileData.length;e++,a=e){g=this._fileData[e].offset;b=g+this._fileData[e].data.length;if(c<g-1)break;if(f<=b+1&&c>=g-1){k=e;break}}if(-1===k)return{startIx:-1,endIx:-1,insertIx:a};for(e=k;e<this._fileData.length&&!(g=this._fileData[e].offset,
+b=g+this._fileData[e].data.length,c>=g-1&&(r=e),c<=b+1);e++);-1===r&&(r=k);return{startIx:k,endIx:r}}},{key:"hasDataRange",value:function(f,c){for(var b=0;b<this._fileData.length;b++){var g=this._fileData[b];if(c<g.offset)break;if(f>=g.offset&&c<g.offset+g.data.length)return!0}return!1}},{key:"getByteAt",value:function(f){for(var c,b=0;b<this._fileData.length;b++){var g=this._fileData[b].offset,k=g+this._fileData[b].data.length-1;if(f>=g&&f<=k){c=this._fileData[b];break}}if(c)return c.data[f-c.offset];
+throw Error("Offset "+f+" hasn't been loaded yet.");}}]);return h}();p.exports=h},{}],6:[function(h,p,n){function m(a){m="function"===typeof Symbol&&"symbol"===typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&"function"===typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?"symbol":typeof a};return m(a)}function q(a,e){for(var d=0;d<e.length;d++){var b=e[d];b.enumerable=b.enumerable||!1;b.configurable=!0;"value"in b&&(b.writable=!0);Object.defineProperty(a,b.key,b)}}
+function t(a,e,b){e&&q(a.prototype,e);b&&q(a,b);return a}function f(a){f=Object.setPrototypeOf?Object.getPrototypeOf:function(a){return a.__proto__||Object.getPrototypeOf(a)};return f(a)}function c(a){if(void 0===a)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return a}function b(a,e){if("function"!==typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function");a.prototype=Object.create(e&&e.prototype,{constructor:{value:a,writable:!0,
+configurable:!0}});e&&g(a,e)}function g(a,e){g=Object.setPrototypeOf||function(a,d){a.__proto__=d;return a};return g(a,e)}function k(a,e,b){e in a?Object.defineProperty(a,e,{value:b,enumerable:!0,configurable:!0,writable:!0}):a[e]=b;return a}var r=[4,132],a=[6,134],e="Other;32x32 pixels 'file icon' (PNG only);Other file icon;Cover (front);Cover (back);Leaflet page;Media (e.g. label side of CD);Lead artist/lead performer/soloist;Artist/performer;Conductor;Band/Orchestra;Composer;Lyricist/text writer;Recording Location;During recording;During performance;Movie/video screen capture;A bright coloured fish;Illustration;Band/artist logotype;Publisher/Studio logotype".split(";");
+h=function(d){function l(){var a;if(!(this instanceof l))throw new TypeError("Cannot call a class as a function");for(var d=arguments.length,e=Array(d),b=0;b<d;b++)e[b]=arguments[b];d=(a=f(l)).call.apply(a,[this].concat(e));a=!d||"object"!==m(d)&&"function"!==typeof d?c(this):d;k(c(a),"_commentOffset",void 0);k(c(a),"_pictureOffset",void 0);return a}b(l,d);t(l,[{key:"_loadData",value:function(a,d){var e=this;a.loadRange([4,7],{onSuccess:function(){e._loadBlock(a,4,d)}})}},{key:"_loadBlock",value:function(d,
+e,b){var l=this,c=d.getByteAt(e),k=d.getInteger24At(e+1,!0);if(-1!==r.indexOf(c)){var g=e+4;d.loadRange([g,g+k],{onSuccess:function(){l._commentOffset=g;l._nextBlock(d,e,c,k,b)}})}else-1!==a.indexOf(c)?(g=e+4,d.loadRange([g,g+k],{onSuccess:function(){l._pictureOffset=g;l._nextBlock(d,e,c,k,b)}})):l._nextBlock(d,e,c,k,b)}},{key:"_nextBlock",value:function(a,d,e,b,l){var c=this;if(127<e)if(c._commentOffset)l.onSuccess();else l.onError({type:"loadData",info:"Comment block could not be found."});else a.loadRange([d+
+4+b,d+4+4+b],{onSuccess:function(){c._loadBlock(a,d+4+b,l)}})}},{key:"_parseData",value:function(a,d){var b=a.getLongAt(this._commentOffset,!1)+(this._commentOffset+4);d=a.getLongAt(b,!1);b+=4;for(var l,c,k,g,u,r,f=0;f<d;f++){var w=a.getLongAt(b,!1),h=a.getStringWithCharsetAt(b+4,w,"utf-8").toString(),m=h.indexOf("=");h=[h.slice(0,m),h.slice(m+1)];switch(h[0]){case "TITLE":l=h[1];break;case "ARTIST":c=h[1];break;case "ALBUM":k=h[1];break;case "TRACKNUMBER":g=h[1];break;case "GENRE":u=h[1]}b+=4+w}this._pictureOffset&&
+(r=a.getLongAt(this._pictureOffset,!0),d=this._pictureOffset+4,b=a.getLongAt(d,!0),f=d+4,d=a.getStringAt(f,b),b=f+b,f=a.getLongAt(b,!0),w=b+4,b=a.getStringWithCharsetAt(w,f,"utf-8").toString(),f=w+f+16,w=a.getLongAt(f,!0),a=a.getBytesAt(f+4,w,!0),r={format:d,type:e[r],description:b,data:a});return{type:"FLAC",version:"1",tags:{title:l,artist:c,album:k,track:g,genre:u,picture:r}}}}],[{key:"getTagIdentifierByteRange",value:function(){return{offset:0,length:4}}},{key:"canReadTagFormat",value:function(a){return"fLaC"===
+String.fromCharCode.apply(String,a.slice(0,4))}}]);return l}(h("./MediaTagReader"));p.exports=h},{"./MediaTagReader":12}],7:[function(h,p,n){function m(b){m="function"===typeof Symbol&&"symbol"===typeof Symbol.iterator?function(b){return typeof b}:function(b){return b&&"function"===typeof Symbol&&b.constructor===Symbol&&b!==Symbol.prototype?"symbol":typeof b};return m(b)}function q(b,c){for(var a=0;a<c.length;a++){var e=c[a];e.enumerable=e.enumerable||!1;e.configurable=!0;"value"in e&&(e.writable=
+!0);Object.defineProperty(b,e.key,e)}}function t(b,c,a){c&&q(b.prototype,c);a&&q(b,a);return b}function f(b){f=Object.setPrototypeOf?Object.getPrototypeOf:function(b){return b.__proto__||Object.getPrototypeOf(b)};return f(b)}function c(c,g){if("function"!==typeof g&&null!==g)throw new TypeError("Super expression must either be null or a function");c.prototype=Object.create(g&&g.prototype,{constructor:{value:c,writable:!0,configurable:!0}});g&&b(c,g)}function b(c,g){b=Object.setPrototypeOf||function(a,
+e){a.__proto__=e;return a};return b(c,g)}n=h("./MediaTagReader");h("./MediaFileReader");h=function(b){function k(){if(!(this instanceof k))throw new TypeError("Cannot call a class as a function");var a=f(k).apply(this,arguments);if(!a||"object"!==m(a)&&"function"!==typeof a){if(void 0===this)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");a=this}return a}c(k,b);t(k,[{key:"_loadData",value:function(a,e){var d=a.getSize();a.loadRange([d-128,d-1],e)}},{key:"_parseData",
+value:function(a,e){var d=a.getSize()-128,b=a.getStringWithCharsetAt(d+3,30).toString(),c=a.getStringWithCharsetAt(d+33,30).toString(),k=a.getStringWithCharsetAt(d+63,30).toString(),f=a.getStringWithCharsetAt(d+93,4).toString();var h=a.getByteAt(d+97+28);e=a.getByteAt(d+97+29);if(0==h&&0!=e){var r="1.1";h=a.getStringWithCharsetAt(d+97,28).toString()}else r="1.0",h=a.getStringWithCharsetAt(d+97,30).toString(),e=0;a=a.getByteAt(d+97+30);a={type:"ID3",version:r,tags:{title:b,artist:c,album:k,year:f,
 comment:h,genre:255>a?g[a]:""}};e&&(a.tags.track=e);return a}}],[{key:"getTagIdentifierByteRange",value:function(){return{offset:-128,length:128}}},{key:"canReadTagFormat",value:function(a){return"TAG"===String.fromCharCode.apply(String,a.slice(0,3))}}]);return k}(n);var g="Blues;Classic Rock;Country;Dance;Disco;Funk;Grunge;Hip-Hop;Jazz;Metal;New Age;Oldies;Other;Pop;R&B;Rap;Reggae;Rock;Techno;Industrial;Alternative;Ska;Death Metal;Pranks;Soundtrack;Euro-Techno;Ambient;Trip-Hop;Vocal;Jazz+Funk;Fusion;Trance;Classical;Instrumental;Acid;House;Game;Sound Clip;Gospel;Noise;AlternRock;Bass;Soul;Punk;Space;Meditative;Instrumental Pop;Instrumental Rock;Ethnic;Gothic;Darkwave;Techno-Industrial;Electronic;Pop-Folk;Eurodance;Dream;Southern Rock;Comedy;Cult;Gangsta;Top 40;Christian Rap;Pop/Funk;Jungle;Native American;Cabaret;New Wave;Psychadelic;Rave;Showtunes;Trailer;Lo-Fi;Tribal;Acid Punk;Acid Jazz;Polka;Retro;Musical;Rock & Roll;Hard Rock;Folk;Folk-Rock;National Folk;Swing;Fast Fusion;Bebob;Latin;Revival;Celtic;Bluegrass;Avantgarde;Gothic Rock;Progressive Rock;Psychedelic Rock;Symphonic Rock;Slow Rock;Big Band;Chorus;Easy Listening;Acoustic;Humour;Speech;Chanson;Opera;Chamber Music;Sonata;Symphony;Booty Bass;Primus;Porn Groove;Satire;Slow Jam;Club;Tango;Samba;Folklore;Ballad;Power Ballad;Rhythmic Soul;Freestyle;Duet;Punk Rock;Drum Solo;Acapella;Euro-House;Dance Hall".split(";");
-p.exports=h},{"./MediaFileReader":11,"./MediaTagReader":12}],8:[function(h,p,n){function m(a,e){for(var c=0;c<e.length;c++){var b=e[c];b.enumerable=b.enumerable||!1;b.configurable=!0;"value"in b&&(b.writable=!0);Object.defineProperty(a,b.key,b)}}function q(a,e,c){e&&m(a.prototype,e);c&&m(a,c);return a}function t(a){switch(a){case 0:a="iso-8859-1";break;case 1:a="utf-16";break;case 2:a="utf-16be";break;case 3:a="utf-8";break;default:a="iso-8859-1"}return a}function f(a,e,c,b){var l=c.getStringWithCharsetAt(a+
-1,e-1,b);a=c.getStringWithCharsetAt(a+1+l.bytesReadCount,e-1-l.bytesReadCount,b);return{user_description:l.toString(),data:a.toString()}}h("./MediaFileReader");var d=h("./StringUtils"),b=h("./ArrayFileReader"),g={BUF:"Recommended buffer size",CNT:"Play counter",COM:"Comments",CRA:"Audio encryption",CRM:"Encrypted meta frame",ETC:"Event timing codes",EQU:"Equalization",GEO:"General encapsulated object",IPL:"Involved people list",LNK:"Linked information",MCI:"Music CD Identifier",MLL:"MPEG location lookup table",
+p.exports=h},{"./MediaFileReader":11,"./MediaTagReader":12}],8:[function(h,p,n){function m(a,e){for(var d=0;d<e.length;d++){var b=e[d];b.enumerable=b.enumerable||!1;b.configurable=!0;"value"in b&&(b.writable=!0);Object.defineProperty(a,b.key,b)}}function q(a,e,d){e&&m(a.prototype,e);d&&m(a,d);return a}function t(a){switch(a){case 0:a="iso-8859-1";break;case 1:a="utf-16";break;case 2:a="utf-16be";break;case 3:a="utf-8";break;default:a="iso-8859-1"}return a}function f(a,e,d,b){var l=d.getStringWithCharsetAt(a+
+1,e-1,b);a=d.getStringWithCharsetAt(a+1+l.bytesReadCount,e-1-l.bytesReadCount,b);return{user_description:l.toString(),data:a.toString()}}h("./MediaFileReader");var c=h("./StringUtils"),b=h("./ArrayFileReader"),g={BUF:"Recommended buffer size",CNT:"Play counter",COM:"Comments",CRA:"Audio encryption",CRM:"Encrypted meta frame",ETC:"Event timing codes",EQU:"Equalization",GEO:"General encapsulated object",IPL:"Involved people list",LNK:"Linked information",MCI:"Music CD Identifier",MLL:"MPEG location lookup table",
 PIC:"Attached picture",POP:"Popularimeter",REV:"Reverb",RVA:"Relative volume adjustment",SLT:"Synchronized lyric/text",STC:"Synced tempo codes",TAL:"Album/Movie/Show title",TBP:"BPM (Beats Per Minute)",TCM:"Composer",TCO:"Content type",TCR:"Copyright message",TDA:"Date",TDY:"Playlist delay",TEN:"Encoded by",TFT:"File type",TIM:"Time",TKE:"Initial key",TLA:"Language(s)",TLE:"Length",TMT:"Media type",TOA:"Original artist(s)/performer(s)",TOF:"Original filename",TOL:"Original Lyricist(s)/text writer(s)",
 TOR:"Original release year",TOT:"Original album/Movie/Show title",TP1:"Lead artist(s)/Lead performer(s)/Soloist(s)/Performing group",TP2:"Band/Orchestra/Accompaniment",TP3:"Conductor/Performer refinement",TP4:"Interpreted, remixed, or otherwise modified by",TPA:"Part of a set",TPB:"Publisher",TRC:"ISRC (International Standard Recording Code)",TRD:"Recording dates",TRK:"Track number/Position in set",TSI:"Size",TSS:"Software/hardware and settings used for encoding",TT1:"Content group description",TT2:"Title/Songname/Content description",
 TT3:"Subtitle/Description refinement",TXT:"Lyricist/text writer",TXX:"User defined text information frame",TYE:"Year",UFI:"Unique file identifier",ULT:"Unsychronized lyric/text transcription",WAF:"Official audio file webpage",WAR:"Official artist/performer webpage",WAS:"Official audio source webpage",WCM:"Commercial information",WCP:"Copyright/Legal information",WPB:"Publishers official webpage",WXX:"User defined URL link frame",AENC:"Audio encryption",APIC:"Attached picture",ASPI:"Audio seek point index",
@@ -36,60 +36,60 @@ RBUF:"Recommended buffer size",RVA2:"Relative volume adjustment (2)",RVAD:"Relat
 TIT1:"Content group description",TIT2:"Title/songname/content description",TIT3:"Subtitle/Description refinement",TKEY:"Initial key",TLAN:"Language(s)",TLEN:"Length",TMCL:"Musician credits list",TMED:"Media type",TMOO:"Mood",TOAL:"Original album/movie/show title",TOFN:"Original filename",TOLY:"Original lyricist(s)/text writer(s)",TOPE:"Original artist(s)/performer(s)",TORY:"Original release year",TOWN:"File owner/licensee",TPE1:"Lead performer(s)/Soloist(s)",TPE2:"Band/orchestra/accompaniment",TPE3:"Conductor/performer refinement",
 TPE4:"Interpreted, remixed, or otherwise modified by",TPOS:"Part of a set",TPRO:"Produced notice",TPUB:"Publisher",TRCK:"Track number/Position in set",TRDA:"Recording dates",TRSN:"Internet radio station name",TRSO:"Internet radio station owner",TSOA:"Album sort order",TSOP:"Performer sort order",TSOT:"Title sort order",TSIZ:"Size",TSRC:"ISRC (international standard recording code)",TSSE:"Software/Hardware and settings used for encoding",TSST:"Set subtitle",TYER:"Year",TXXX:"User defined text information frame",
 UFID:"Unique file identifier",USER:"Terms of use",USLT:"Unsychronized lyric/text transcription",WCOM:"Commercial information",WCOP:"Copyright/Legal information",WOAF:"Official audio file webpage",WOAR:"Official artist/performer webpage",WOAS:"Official audio source webpage",WORS:"Official internet radio station homepage",WPAY:"Payment",WPUB:"Publishers official webpage",WXXX:"User defined URL link frame"};h=function(){function a(){if(!(this instanceof a))throw new TypeError("Cannot call a class as a function");
-}q(a,null,[{key:"getFrameReaderFunction",value:function(a){return a in k?k[a]:"T"===a[0]?k["T*"]:"W"===a[0]?k["W*"]:null}},{key:"readFrames",value:function(e,c,b,d,g){for(var l={},k=this._getFrameHeaderSize(d);e<c-k;){var f=this._readFrameHeader(b,e,d),u=f.id;if(!u)break;var h=f.flags,w=f.size,r=e+f.headerSize,m=b;e+=f.headerSize+f.size;if(!g||-1!==g.indexOf(u)){if("MP3e"===u||"\x00MP3"===u||"\x00\x00MP"===u||" MP3"===u)break;h&&h.format.unsynchronisation&&(m=this.getUnsyncFileReader(m,r,w),r=0,w=
-m.getSize());h&&h.format.data_length_indicator&&(r+=4,w-=4);h=(f=a.getFrameReaderFunction(u))?f.apply(this,[r,w,m,h,d]):null;r=this._getFrameDescription(u);w={id:u,size:w,description:r,data:h};u in l?(l[u].id&&(l[u]=[l[u]]),l[u].push(w)):l[u]=w}}return l}},{key:"_getFrameHeaderSize",value:function(a){a=a.major;return 2==a?6:3==a||4==a?10:0}},{key:"_readFrameHeader",value:function(a,c,b){var e=b.major,l=null;b=this._getFrameHeaderSize(b);switch(e){case 2:var d=a.getStringAt(c,3);var g=a.getInteger24At(c+
-3,!0);break;case 3:d=a.getStringAt(c,4);g=a.getLongAt(c+4,!0);break;case 4:d=a.getStringAt(c,4),g=a.getSynchsafeInteger32At(c+4)}if(d==String.fromCharCode(0,0,0)||d==String.fromCharCode(0,0,0,0))d="";d&&2<e&&(l=this._readFrameFlags(a,c+8));return{id:d||"",size:g||0,headerSize:b||0,flags:l}}},{key:"_readFrameFlags",value:function(a,c){return{message:{tag_alter_preservation:a.isBitSetAt(c,6),file_alter_preservation:a.isBitSetAt(c,5),read_only:a.isBitSetAt(c,4)},format:{grouping_identity:a.isBitSetAt(c+
-1,7),compression:a.isBitSetAt(c+1,3),encryption:a.isBitSetAt(c+1,2),unsynchronisation:a.isBitSetAt(c+1,1),data_length_indicator:a.isBitSetAt(c+1,0)}}}},{key:"_getFrameDescription",value:function(a){return a in g?g[a]:"Unknown"}},{key:"getUnsyncFileReader",value:function(a,c,l){a=a.getBytesAt(c,l);for(c=0;c<a.length-1;c++)255===a[c]&&0===a[c+1]&&a.splice(c+1,1);return new b(a)}}]);return a}();var k={APIC:function(a,b,c,l,d){l=a;var e=t(c.getByteAt(a));switch(d&&d.major){case 2:d=c.getStringAt(a+1,
-3);a+=4;break;case 3:case 4:d=c.getStringWithCharsetAt(a+1,b-1);a+=1+d.bytesReadCount;break;default:throw Error("Couldn't read ID3v2 major version.");}var g=c.getByteAt(a);g=r[g];e=c.getStringWithCharsetAt(a+1,b-(a-l)-1,e);a+=1+e.bytesReadCount;return{format:d.toString(),type:g,description:e.toString(),data:c.getBytesAt(a,l+b-a)}},CHAP:function(a,b,c,l,g){l=a;var e={},k=d.readNullTerminatedString(c.getBytesAt(a,b));e.id=k.toString();a+=k.bytesReadCount;e.startTime=c.getLongAt(a,!0);a+=4;e.endTime=
-c.getLongAt(a,!0);a+=4;e.startOffset=c.getLongAt(a,!0);a+=4;e.endOffset=c.getLongAt(a,!0);a+=4;e.subFrames=this.readFrames(a,a+(b-(a-l)),c,g);return e},CTOC:function(a,b,c,l,g){l=a;var e={childElementIds:[],id:void 0,topLevel:void 0,ordered:void 0,entryCount:void 0,subFrames:void 0},k=d.readNullTerminatedString(c.getBytesAt(a,b));e.id=k.toString();a+=k.bytesReadCount;e.topLevel=c.isBitSetAt(a,1);e.ordered=c.isBitSetAt(a,0);a++;e.entryCount=c.getByteAt(a);a++;for(k=0;k<e.entryCount;k++){var f=d.readNullTerminatedString(c.getBytesAt(a,
-b-(a-l)));e.childElementIds.push(f.toString());a+=f.bytesReadCount}e.subFrames=this.readFrames(a,a+(b-(a-l)),c,g);return e},COMM:function(a,b,c,l,d){var e=a,g=t(c.getByteAt(a));l=c.getStringAt(a+1,3);d=c.getStringWithCharsetAt(a+4,b-4,g);a+=4+d.bytesReadCount;a=c.getStringWithCharsetAt(a,e+b-a,g);return{language:l,short_description:d.toString(),text:a.toString()}}};k.COM=k.COMM;k.PIC=function(a,b,c,l,d){return k.APIC(a,b,c,l,d)};k.PCNT=function(a,b,c,l,d){return c.getLongAt(a,!1)};k.CNT=k.PCNT;k["T*"]=
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+{};b=this._expandShortcutTags(b);this._readAtom(d,a,0,a.getSize(),b);for(var e in r)r.hasOwnProperty(e)&&(b=d[r[e]])&&(d[e]="track"===e?b.data.track:b.data);return{type:"MP4",ftyp:a.getStringAt(8,4),version:a.getLongAt(12,!0),tags:d}}},{key:"_readAtom",value:function(a,b,e,c,g,k,f){f=void 0===f?"":f+"  ";for(var d=e;d<e+c;){var l=b.getLongAt(d,!0);if(0==l)break;var h=b.getStringAt(d+4,4);if(this._isContainerAtom(h)){"meta"==h&&(d+=4);this._readAtom(a,b,d+8,l-8,g,(k?k+".":"")+h,f);break}(!g||0<=g.indexOf(h))&&
+"moov.udta.meta.ilst"===k&&this._canReadAtom(h)&&(a[h]=this._readMetadataAtom(b,d));d+=l}}},{key:"_readMetadataAtom",value:function(a,b){var d=a.getLongAt(b,!0),e=a.getStringAt(b+4,4),c=a.getInteger24At(b+16+1,!0);c=g[c];if("trkn"==e)var l={track:a.getByteAt(b+16+11),total:a.getByteAt(b+16+13)};else if("disk"==e)l={disk:a.getByteAt(b+16+11),total:a.getByteAt(b+16+13)};else{b+=24;var f=d-24;"covr"===e&&"uint8"===c&&(c="jpeg");switch(c){case "text":l=a.getStringWithCharsetAt(b,f,"utf-8").toString();
+break;case "uint8":l=a.getShortAt(b,!1);break;case "int":case "uint":l=("int"==c?1==f?a.getSByteAt:2==f?a.getSShortAt:4==f?a.getSLongAt:a.getLongAt:1==f?a.getByteAt:2==f?a.getShortAt:a.getLongAt).call(a,b+(8==f?4:0),!0);break;case "jpeg":case "png":l={format:"image/"+c,data:a.getBytesAt(b,f)}}}return{id:e,size:d,description:k[e]||"Unknown",data:l}}},{key:"getShortcuts",value:function(){return r}}],[{key:"getTagIdentifierByteRange",value:function(){return{offset:0,length:16}}},{key:"canReadTagFormat",
 value:function(a){return"ftyp"===String.fromCharCode.apply(String,a.slice(4,8))}}]);return b}(n);var g={0:"uint8",1:"text",13:"jpeg",14:"png",21:"int",22:"uint"},k={"\u00a9alb":"Album","\u00a9ART":"Artist",aART:"Album Artist","\u00a9day":"Release Date","\u00a9nam":"Title","\u00a9gen":"Genre",gnre:"Genre",trkn:"Track Number","\u00a9wrt":"Composer","\u00a9too":"Encoding Tool","\u00a9enc":"Encoded By",cprt:"Copyright",covr:"Cover Art","\u00a9grp":"Grouping",keyw:"Keywords","\u00a9lyr":"Lyrics","\u00a9cmt":"Comment",
 tmpo:"Tempo",cpil:"Compilation",disk:"Disc Number",tvsh:"TV Show Name",tven:"TV Episode ID",tvsn:"TV Season",tves:"TV Episode",tvnn:"TV Network",desc:"Description",ldes:"Long Description",sonm:"Sort Name",soar:"Sort Artist",soaa:"Sort Album",soco:"Sort Composer",sosn:"Sort Show",purd:"Purchase Date",pcst:"Podcast",purl:"Podcast URL",catg:"Category",hdvd:"HD Video",stik:"Media Type",rtng:"Content Rating",pgap:"Gapless Playback",apID:"Purchase Account",sfID:"Country Code",atID:"Artist ID",cnID:"Catalog ID",
-plID:"Collection ID",geID:"Genre ID","xid ":"Vendor Information",flvr:"Codec Flavor"},r={title:"\u00a9nam",artist:"\u00a9ART",album:"\u00a9alb",year:"\u00a9day",comment:"\u00a9cmt",track:"trkn",genre:"\u00a9gen",picture:"covr",lyrics:"\u00a9lyr"};p.exports=h},{"./MediaFileReader":11,"./MediaTagReader":12}],11:[function(h,p,n){function m(d,b){for(var g=0;g<b.length;g++){var k=b[g];k.enumerable=k.enumerable||!1;k.configurable=!0;"value"in k&&(k.writable=!0);Object.defineProperty(d,k.key,k)}}function q(d,
-b,g){b&&m(d.prototype,b);g&&m(d,g);return d}function t(d,b,g){b in d?Object.defineProperty(d,b,{value:g,enumerable:!0,configurable:!0,writable:!0}):d[b]=g;return d}var f=h("./StringUtils");h=function(){function d(b){if(!(this instanceof d))throw new TypeError("Cannot call a class as a function");t(this,"_isInitialized",void 0);t(this,"_size",void 0);this._isInitialized=!1;this._size=0}q(d,[{key:"init",value:function(b){var d=this;if(this._isInitialized)setTimeout(b.onSuccess,1);else return this._init({onSuccess:function(){d._isInitialized=
-!0;b.onSuccess()},onError:b.onError})}},{key:"_init",value:function(b){throw Error("Must implement init function");}},{key:"loadRange",value:function(b,d){throw Error("Must implement loadRange function");}},{key:"getSize",value:function(){if(!this._isInitialized)throw Error("init() must be called first.");return this._size}},{key:"getByteAt",value:function(b){throw Error("Must implement getByteAt function");}},{key:"getBytesAt",value:function(b,d){for(var g=Array(d),f=0;f<d;f++)g[f]=this.getByteAt(b+
-f);return g}},{key:"isBitSetAt",value:function(b,d){return 0!=(this.getByteAt(b)&1<<d)}},{key:"getSByteAt",value:function(b){b=this.getByteAt(b);return 127<b?b-256:b}},{key:"getShortAt",value:function(b,d){b=d?(this.getByteAt(b)<<8)+this.getByteAt(b+1):(this.getByteAt(b+1)<<8)+this.getByteAt(b);0>b&&(b+=65536);return b}},{key:"getSShortAt",value:function(b,d){b=this.getShortAt(b,d);return 32767<b?b-65536:b}},{key:"getLongAt",value:function(b,d){var g=this.getByteAt(b),f=this.getByteAt(b+1),a=this.getByteAt(b+
-2);b=this.getByteAt(b+3);d=d?(((g<<8)+f<<8)+a<<8)+b:(((b<<8)+a<<8)+f<<8)+g;0>d&&(d+=4294967296);return d}},{key:"getSLongAt",value:function(b,d){b=this.getLongAt(b,d);return 2147483647<b?b-4294967296:b}},{key:"getInteger24At",value:function(b,d){var g=this.getByteAt(b),f=this.getByteAt(b+1);b=this.getByteAt(b+2);d=d?((g<<8)+f<<8)+b:((b<<8)+f<<8)+g;0>d&&(d+=16777216);return d}},{key:"getStringAt",value:function(b,d){for(var g=[],f=b,a=0;f<b+d;f++,a++)g[a]=String.fromCharCode(this.getByteAt(f));return g.join("")}},
-{key:"getStringWithCharsetAt",value:function(b,d,k){b=this.getBytesAt(b,d);switch((k||"").toLowerCase()){case "utf-16":case "utf-16le":case "utf-16be":k=f.readUTF16String(b,"utf-16be"===k);break;case "utf-8":k=f.readUTF8String(b);break;default:k=f.readNullTerminatedString(b)}return k}},{key:"getCharAt",value:function(b){return String.fromCharCode(this.getByteAt(b))}},{key:"getSynchsafeInteger32At",value:function(b){var d=this.getByteAt(b),f=this.getByteAt(b+1),h=this.getByteAt(b+2);return this.getByteAt(b+
-3)&127|(h&127)<<7|(f&127)<<14|(d&127)<<21}}],[{key:"canReadFile",value:function(b){throw Error("Must implement canReadFile function");}}]);return d}();p.exports=h},{"./StringUtils":13}],12:[function(h,p,n){function m(f,d){for(var b=0;b<d.length;b++){var g=d[b];g.enumerable=g.enumerable||!1;g.configurable=!0;"value"in g&&(g.writable=!0);Object.defineProperty(f,g.key,g)}}function q(f,d,b){d&&m(f.prototype,d);b&&m(f,b);return f}function t(f,d,b){d in f?Object.defineProperty(f,d,{value:b,enumerable:!0,
-configurable:!0,writable:!0}):f[d]=b;return f}h("./MediaFileReader");h=function(){function f(d){if(!(this instanceof f))throw new TypeError("Cannot call a class as a function");t(this,"_mediaFileReader",void 0);t(this,"_tags",void 0);this._mediaFileReader=d;this._tags=null}q(f,[{key:"setTagsToRead",value:function(d){this._tags=d;return this}},{key:"read",value:function(d){var b=this;this._mediaFileReader.init({onSuccess:function(){b._loadData(b._mediaFileReader,{onSuccess:function(){try{var g=b._parseData(b._mediaFileReader,
-b._tags)}catch(k){if(d.onError){d.onError({type:"parseData",info:k.message});return}}d.onSuccess(g)},onError:d.onError})},onError:d.onError})}},{key:"getShortcuts",value:function(){return{}}},{key:"_loadData",value:function(d,b){throw Error("Must implement _loadData function");}},{key:"_parseData",value:function(d,b){throw Error("Must implement _parseData function");}},{key:"_expandShortcutTags",value:function(d){if(!d)return null;for(var b=[],g=this.getShortcuts(),f=0,h;h=d[f];f++)b=b.concat(g[h]||
-[h]);return b}}],[{key:"getTagIdentifierByteRange",value:function(){throw Error("Must implement");}},{key:"canReadTagFormat",value:function(d){throw Error("Must implement");}}]);return f}();p.exports=h},{"./MediaFileReader":11}],13:[function(h,p,n){function m(d,b){for(var g=0;g<b.length;g++){var f=b[g];f.enumerable=f.enumerable||!1;f.configurable=!0;"value"in f&&(f.writable=!0);Object.defineProperty(d,f.key,f)}}function q(d,b,f){b&&m(d.prototype,b);f&&m(d,f);return d}function t(d,b,f){b in d?Object.defineProperty(d,
-b,{value:f,enumerable:!0,configurable:!0,writable:!0}):d[b]=f;return d}var f=function(){function d(b,f){if(!(this instanceof d))throw new TypeError("Cannot call a class as a function");t(this,"_value",void 0);t(this,"bytesReadCount",void 0);t(this,"length",void 0);this._value=b;this.bytesReadCount=f;this.length=b.length}q(d,[{key:"toString",value:function(){return this._value}}]);return d}();p.exports={readUTF16String:function(d,b,g){var k=0,h=1,a=0;g=Math.min(g||d.length,d.length);254==d[0]&&255==
-d[1]?(b=!0,k=2):255==d[0]&&254==d[1]&&(b=!1,k=2);b&&(h=0,a=1);b=[];for(var e=0;k<g;e++){var c=d[k+h],l=(c<<8)+d[k+a];k+=2;if(0==l)break;else 216>c||224<=c?b[e]=String.fromCharCode(l):(c=(d[k+h]<<8)+d[k+a],k+=2,b[e]=String.fromCharCode(l,c))}return new f(b.join(""),k)},readUTF8String:function(d,b){var g=0;b=Math.min(b||d.length,d.length);239==d[0]&&187==d[1]&&191==d[2]&&(g=3);for(var h=[],m=0;g<b;m++){var a=d[g++];if(0==a)break;else if(128>a)h[m]=String.fromCharCode(a);else if(194<=a&&224>a){var e=
-d[g++];h[m]=String.fromCharCode(((a&31)<<6)+(e&63))}else if(224<=a&&240>a){e=d[g++];var c=d[g++];h[m]=String.fromCharCode(((a&255)<<12)+((e&63)<<6)+(c&63))}else if(240<=a&&245>a){e=d[g++];c=d[g++];var l=d[g++];c=((a&7)<<18)+((e&63)<<12)+((c&63)<<6)+(l&63)-65536;h[m]=String.fromCharCode((c>>10)+55296,(c&1023)+56320)}}return new f(h.join(""),g)},readNullTerminatedString:function(d,b){var g=[];b=b||d.length;for(var h=0;h<b;){var m=d[h++];if(0==m)break;g[h-1]=String.fromCharCode(m)}return new f(g.join(""),
-h)}}},{}],14:[function(h,p,n){function m(a){m="function"===typeof Symbol&&"symbol"===typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&"function"===typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?"symbol":typeof a};return m(a)}function q(a,b){for(var c=0;c<b.length;c++){var d=b[c];d.enumerable=d.enumerable||!1;d.configurable=!0;"value"in d&&(d.writable=!0);Object.defineProperty(a,d.key,d)}}function t(a,b,c){b&&q(a.prototype,b);c&&q(a,c);return a}function f(a){f=
-Object.setPrototypeOf?Object.getPrototypeOf:function(a){return a.__proto__||Object.getPrototypeOf(a)};return f(a)}function d(a){if(void 0===a)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return a}function b(a,b){if("function"!==typeof b&&null!==b)throw new TypeError("Super expression must either be null or a function");a.prototype=Object.create(b&&b.prototype,{constructor:{value:a,writable:!0,configurable:!0}});b&&g(a,b)}function g(a,b){g=Object.setPrototypeOf||
-function(a,b){a.__proto__=b;return a};return g(a,b)}function k(a,b,c){b in a?Object.defineProperty(a,b,{value:c,enumerable:!0,configurable:!0,writable:!0}):a[b]=c;return a}var r=h("./ChunkedFileData");n=function(a){function e(a){if(!(this instanceof e))throw new TypeError("Cannot call a class as a function");var b=f(e).call(this);b=!b||"object"!==m(b)&&"function"!==typeof b?d(this):b;k(d(b),"_url",void 0);k(d(b),"_fileData",void 0);b._url=a;b._fileData=new r;return b}b(e,a);t(e,[{key:"_init",value:function(a){e._config.avoidHeadRequests?
-this._fetchSizeWithGetRequest(a):this._fetchSizeWithHeadRequest(a)}},{key:"_fetchSizeWithHeadRequest",value:function(a){var b=this;this._makeXHRRequest("HEAD",null,{onSuccess:function(c){(c=b._parseContentLength(c))?(b._size=c,a.onSuccess()):b._fetchSizeWithGetRequest(a)},onError:a.onError})}},{key:"_fetchSizeWithGetRequest",value:function(a){var b=this,c=this._roundRangeToChunkMultiple([0,0]);this._makeXHRRequest("GET",c,{onSuccess:function(c){var d=b._parseContentRange(c);c=b._getXhrResponseContent(c);
-if(d){if(null==d.instanceLength){b._fetchEntireFile(a);return}b._size=d.instanceLength}else b._size=c.length;b._fileData.addData(0,c);a.onSuccess()},onError:a.onError})}},{key:"_fetchEntireFile",value:function(a){var b=this;this._makeXHRRequest("GET",null,{onSuccess:function(c){c=b._getXhrResponseContent(c);b._size=c.length;b._fileData.addData(0,c);a.onSuccess()},onError:a.onError})}},{key:"_getXhrResponseContent",value:function(a){return a.responseBody||a.responseText||""}},{key:"_parseContentLength",
-value:function(a){a=this._getResponseHeader(a,"Content-Length");return null==a?a:parseInt(a,10)}},{key:"_parseContentRange",value:function(a){if(a=this._getResponseHeader(a,"Content-Range")){var b=a.match(/bytes (\d+)-(\d+)\/(?:(\d+)|\*)/i);if(!b)throw Error("FIXME: Unknown Content-Range syntax: "+a);return{firstBytePosition:parseInt(b[1],10),lastBytePosition:parseInt(b[2],10),instanceLength:b[3]?parseInt(b[3],10):null}}return null}},{key:"loadRange",value:function(a,b){var c=this;c._fileData.hasDataRange(a[0],
-Math.min(c._size,a[1]))?setTimeout(b.onSuccess,1):(a=this._roundRangeToChunkMultiple(a),a[1]=Math.min(c._size,a[1]),this._makeXHRRequest("GET",a,{onSuccess:function(d){d=c._getXhrResponseContent(d);c._fileData.addData(a[0],d);b.onSuccess()},onError:b.onError}))}},{key:"_roundRangeToChunkMultiple",value:function(a){return[a[0],a[0]+1024*Math.ceil((a[1]-a[0]+1)/1024)-1]}},{key:"_makeXHRRequest",value:function(a,b,d){var c=this._createXHRObject();c.open(a,this._url);var f=function(){if(200===c.status||
-206===c.status)d.onSuccess(c);else if(d.onError)d.onError({type:"xhr",info:"Unexpected HTTP status "+c.status+".",xhr:c});c=null};"undefined"!==typeof c.onload?(c.onload=f,c.onerror=function(){if(d.onError)d.onError({type:"xhr",info:"Generic XHR error, check xhr object.",xhr:c})}):c.onreadystatechange=function(){4===c.readyState&&f()};e._config.timeoutInSec&&(c.timeout=1E3*e._config.timeoutInSec,c.ontimeout=function(){if(d.onError)d.onError({type:"xhr",info:"Timeout after "+c.timeout/1E3+"s. Use jsmediatags.Config.setXhrTimeout to override.",
-xhr:c})});c.overrideMimeType("text/plain; charset=x-user-defined");b&&this._setRequestHeader(c,"Range","bytes="+b[0]+"-"+b[1]);this._setRequestHeader(c,"If-Modified-Since","Sat, 01 Jan 1970 00:00:00 GMT");c.send(null)}},{key:"_setRequestHeader",value:function(a,b,d){0>e._config.disallowedXhrHeaders.indexOf(b.toLowerCase())&&a.setRequestHeader(b,d)}},{key:"_hasResponseHeader",value:function(a,b){a=a.getAllResponseHeaders();if(!a)return!1;a=a.split("\r\n");for(var c=[],d=0;d<a.length;d++)c[d]=a[d].split(":")[0].toLowerCase();
-return 0<=c.indexOf(b.toLowerCase())}},{key:"_getResponseHeader",value:function(a,b){return this._hasResponseHeader(a,b)?a.getResponseHeader(b):null}},{key:"getByteAt",value:function(a){return this._fileData.getByteAt(a).charCodeAt(0)&255}},{key:"_isWebWorker",value:function(){return"undefined"!==typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope}},{key:"_createXHRObject",value:function(){if("undefined"===typeof window&&!this._isWebWorker())return new (h("xhr2").XMLHttpRequest);if("undefined"!==
+plID:"Collection ID",geID:"Genre ID","xid ":"Vendor Information",flvr:"Codec Flavor"},r={title:"\u00a9nam",artist:"\u00a9ART",album:"\u00a9alb",year:"\u00a9day",comment:"\u00a9cmt",track:"trkn",genre:"\u00a9gen",picture:"covr",lyrics:"\u00a9lyr"};p.exports=h},{"./MediaFileReader":11,"./MediaTagReader":12}],11:[function(h,p,n){function m(c,b){for(var g=0;g<b.length;g++){var k=b[g];k.enumerable=k.enumerable||!1;k.configurable=!0;"value"in k&&(k.writable=!0);Object.defineProperty(c,k.key,k)}}function q(c,
+b,g){b&&m(c.prototype,b);g&&m(c,g);return c}function t(c,b,g){b in c?Object.defineProperty(c,b,{value:g,enumerable:!0,configurable:!0,writable:!0}):c[b]=g;return c}var f=h("./StringUtils");h=function(){function c(b){if(!(this instanceof c))throw new TypeError("Cannot call a class as a function");t(this,"_isInitialized",void 0);t(this,"_size",void 0);this._isInitialized=!1;this._size=0}q(c,[{key:"init",value:function(b){var c=this;if(this._isInitialized)setTimeout(b.onSuccess,1);else return this._init({onSuccess:function(){c._isInitialized=
+!0;b.onSuccess()},onError:b.onError})}},{key:"_init",value:function(b){throw Error("Must implement init function");}},{key:"loadRange",value:function(b,c){throw Error("Must implement loadRange function");}},{key:"getSize",value:function(){if(!this._isInitialized)throw Error("init() must be called first.");return this._size}},{key:"getByteAt",value:function(b){throw Error("Must implement getByteAt function");}},{key:"getBytesAt",value:function(b,c){for(var g=Array(c),f=0;f<c;f++)g[f]=this.getByteAt(b+
+f);return g}},{key:"isBitSetAt",value:function(b,c){return 0!=(this.getByteAt(b)&1<<c)}},{key:"getSByteAt",value:function(b){b=this.getByteAt(b);return 127<b?b-256:b}},{key:"getShortAt",value:function(b,c){b=c?(this.getByteAt(b)<<8)+this.getByteAt(b+1):(this.getByteAt(b+1)<<8)+this.getByteAt(b);0>b&&(b+=65536);return b}},{key:"getSShortAt",value:function(b,c){b=this.getShortAt(b,c);return 32767<b?b-65536:b}},{key:"getLongAt",value:function(b,c){var g=this.getByteAt(b),f=this.getByteAt(b+1),a=this.getByteAt(b+
+2);b=this.getByteAt(b+3);c=c?(((g<<8)+f<<8)+a<<8)+b:(((b<<8)+a<<8)+f<<8)+g;0>c&&(c+=4294967296);return c}},{key:"getSLongAt",value:function(b,c){b=this.getLongAt(b,c);return 2147483647<b?b-4294967296:b}},{key:"getInteger24At",value:function(b,c){var g=this.getByteAt(b),f=this.getByteAt(b+1);b=this.getByteAt(b+2);c=c?((g<<8)+f<<8)+b:((b<<8)+f<<8)+g;0>c&&(c+=16777216);return c}},{key:"getStringAt",value:function(b,c){for(var g=[],f=b,a=0;f<b+c;f++,a++)g[a]=String.fromCharCode(this.getByteAt(f));return g.join("")}},
+{key:"getStringWithCharsetAt",value:function(b,c,k){b=this.getBytesAt(b,c);switch((k||"").toLowerCase()){case "utf-16":case "utf-16le":case "utf-16be":k=f.readUTF16String(b,"utf-16be"===k);break;case "utf-8":k=f.readUTF8String(b);break;default:k=f.readNullTerminatedString(b)}return k}},{key:"getCharAt",value:function(b){return String.fromCharCode(this.getByteAt(b))}},{key:"getSynchsafeInteger32At",value:function(b){var c=this.getByteAt(b),f=this.getByteAt(b+1),h=this.getByteAt(b+2);return this.getByteAt(b+
+3)&127|(h&127)<<7|(f&127)<<14|(c&127)<<21}}],[{key:"canReadFile",value:function(b){throw Error("Must implement canReadFile function");}}]);return c}();p.exports=h},{"./StringUtils":13}],12:[function(h,p,n){function m(f,c){for(var b=0;b<c.length;b++){var g=c[b];g.enumerable=g.enumerable||!1;g.configurable=!0;"value"in g&&(g.writable=!0);Object.defineProperty(f,g.key,g)}}function q(f,c,b){c&&m(f.prototype,c);b&&m(f,b);return f}function t(f,c,b){c in f?Object.defineProperty(f,c,{value:b,enumerable:!0,
+configurable:!0,writable:!0}):f[c]=b;return f}h("./MediaFileReader");h=function(){function f(c){if(!(this instanceof f))throw new TypeError("Cannot call a class as a function");t(this,"_mediaFileReader",void 0);t(this,"_tags",void 0);this._mediaFileReader=c;this._tags=null}q(f,[{key:"setTagsToRead",value:function(c){this._tags=c;return this}},{key:"read",value:function(c){var b=this;this._mediaFileReader.init({onSuccess:function(){b._loadData(b._mediaFileReader,{onSuccess:function(){try{var g=b._parseData(b._mediaFileReader,
+b._tags)}catch(k){if(c.onError){c.onError({type:"parseData",info:k.message});return}}c.onSuccess(g)},onError:c.onError})},onError:c.onError})}},{key:"getShortcuts",value:function(){return{}}},{key:"_loadData",value:function(c,b){throw Error("Must implement _loadData function");}},{key:"_parseData",value:function(c,b){throw Error("Must implement _parseData function");}},{key:"_expandShortcutTags",value:function(c){if(!c)return null;for(var b=[],g=this.getShortcuts(),f=0,h;h=c[f];f++)b=b.concat(g[h]||
+[h]);return b}}],[{key:"getTagIdentifierByteRange",value:function(){throw Error("Must implement");}},{key:"canReadTagFormat",value:function(c){throw Error("Must implement");}}]);return f}();p.exports=h},{"./MediaFileReader":11}],13:[function(h,p,n){function m(c,b){for(var g=0;g<b.length;g++){var f=b[g];f.enumerable=f.enumerable||!1;f.configurable=!0;"value"in f&&(f.writable=!0);Object.defineProperty(c,f.key,f)}}function q(c,b,f){b&&m(c.prototype,b);f&&m(c,f);return c}function t(c,b,f){b in c?Object.defineProperty(c,
+b,{value:f,enumerable:!0,configurable:!0,writable:!0}):c[b]=f;return c}var f=function(){function c(b,f){if(!(this instanceof c))throw new TypeError("Cannot call a class as a function");t(this,"_value",void 0);t(this,"bytesReadCount",void 0);t(this,"length",void 0);this._value=b;this.bytesReadCount=f;this.length=b.length}q(c,[{key:"toString",value:function(){return this._value}}]);return c}();p.exports={readUTF16String:function(c,b,g){var k=0,h=1,a=0;g=Math.min(g||c.length,c.length);254==c[0]&&255==
+c[1]?(b=!0,k=2):255==c[0]&&254==c[1]&&(b=!1,k=2);b&&(h=0,a=1);b=[];for(var e=0;k<g;e++){var d=c[k+h],l=(d<<8)+c[k+a];k+=2;if(0==l)break;else 216>d||224<=d?b[e]=String.fromCharCode(l):(d=(c[k+h]<<8)+c[k+a],k+=2,b[e]=String.fromCharCode(l,d))}return new f(b.join(""),k)},readUTF8String:function(c,b){var g=0;b=Math.min(b||c.length,c.length);239==c[0]&&187==c[1]&&191==c[2]&&(g=3);for(var h=[],m=0;g<b;m++){var a=c[g++];if(0==a)break;else if(128>a)h[m]=String.fromCharCode(a);else if(194<=a&&224>a){var e=
+c[g++];h[m]=String.fromCharCode(((a&31)<<6)+(e&63))}else if(224<=a&&240>a){e=c[g++];var d=c[g++];h[m]=String.fromCharCode(((a&255)<<12)+((e&63)<<6)+(d&63))}else if(240<=a&&245>a){e=c[g++];d=c[g++];var l=c[g++];d=((a&7)<<18)+((e&63)<<12)+((d&63)<<6)+(l&63)-65536;h[m]=String.fromCharCode((d>>10)+55296,(d&1023)+56320)}}return new f(h.join(""),g)},readNullTerminatedString:function(c,b){var g=[];b=b||c.length;for(var h=0;h<b;){var m=c[h++];if(0==m)break;g[h-1]=String.fromCharCode(m)}return new f(g.join(""),
+h)}}},{}],14:[function(h,p,n){function m(a){m="function"===typeof Symbol&&"symbol"===typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&"function"===typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?"symbol":typeof a};return m(a)}function q(a,b){for(var d=0;d<b.length;d++){var c=b[d];c.enumerable=c.enumerable||!1;c.configurable=!0;"value"in c&&(c.writable=!0);Object.defineProperty(a,c.key,c)}}function t(a,b,d){b&&q(a.prototype,b);d&&q(a,d);return a}function f(a){f=
+Object.setPrototypeOf?Object.getPrototypeOf:function(a){return a.__proto__||Object.getPrototypeOf(a)};return f(a)}function c(a){if(void 0===a)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return a}function b(a,b){if("function"!==typeof b&&null!==b)throw new TypeError("Super expression must either be null or a function");a.prototype=Object.create(b&&b.prototype,{constructor:{value:a,writable:!0,configurable:!0}});b&&g(a,b)}function g(a,b){g=Object.setPrototypeOf||
+function(a,b){a.__proto__=b;return a};return g(a,b)}function k(a,b,d){b in a?Object.defineProperty(a,b,{value:d,enumerable:!0,configurable:!0,writable:!0}):a[b]=d;return a}var r=h("./ChunkedFileData");n=function(a){function e(a){if(!(this instanceof e))throw new TypeError("Cannot call a class as a function");var b=f(e).call(this);b=!b||"object"!==m(b)&&"function"!==typeof b?c(this):b;k(c(b),"_url",void 0);k(c(b),"_fileData",void 0);b._url=a;b._fileData=new r;return b}b(e,a);t(e,[{key:"_init",value:function(a){e._config.avoidHeadRequests?
+this._fetchSizeWithGetRequest(a):this._fetchSizeWithHeadRequest(a)}},{key:"_fetchSizeWithHeadRequest",value:function(a){var b=this;this._makeXHRRequest("HEAD",null,{onSuccess:function(d){(d=b._parseContentLength(d))?(b._size=d,a.onSuccess()):b._fetchSizeWithGetRequest(a)},onError:a.onError})}},{key:"_fetchSizeWithGetRequest",value:function(a){var b=this,d=this._roundRangeToChunkMultiple([0,0]);this._makeXHRRequest("GET",d,{onSuccess:function(d){var c=b._parseContentRange(d);d=b._getXhrResponseContent(d);
+if(c){if(null==c.instanceLength){b._fetchEntireFile(a);return}b._size=c.instanceLength}else b._size=d.length;b._fileData.addData(0,d);a.onSuccess()},onError:a.onError})}},{key:"_fetchEntireFile",value:function(a){var b=this;this._makeXHRRequest("GET",null,{onSuccess:function(d){d=b._getXhrResponseContent(d);b._size=d.length;b._fileData.addData(0,d);a.onSuccess()},onError:a.onError})}},{key:"_getXhrResponseContent",value:function(a){return a.responseBody||a.responseText||""}},{key:"_parseContentLength",
+value:function(a){a=this._getResponseHeader(a,"Content-Length");return null==a?a:parseInt(a,10)}},{key:"_parseContentRange",value:function(a){if(a=this._getResponseHeader(a,"Content-Range")){var b=a.match(/bytes (\d+)-(\d+)\/(?:(\d+)|\*)/i);if(!b)throw Error("FIXME: Unknown Content-Range syntax: "+a);return{firstBytePosition:parseInt(b[1],10),lastBytePosition:parseInt(b[2],10),instanceLength:b[3]?parseInt(b[3],10):null}}return null}},{key:"loadRange",value:function(a,b){var d=this;d._fileData.hasDataRange(a[0],
+Math.min(d._size,a[1]))?setTimeout(b.onSuccess,1):(a=this._roundRangeToChunkMultiple(a),a[1]=Math.min(d._size,a[1]),this._makeXHRRequest("GET",a,{onSuccess:function(c){c=d._getXhrResponseContent(c);d._fileData.addData(a[0],c);b.onSuccess()},onError:b.onError}))}},{key:"_roundRangeToChunkMultiple",value:function(a){return[a[0],a[0]+1024*Math.ceil((a[1]-a[0]+1)/1024)-1]}},{key:"_makeXHRRequest",value:function(a,b,c){var d=this._createXHRObject();d.open(a,this._url);var f=function(){if(200===d.status||
+206===d.status)c.onSuccess(d);else if(c.onError)c.onError({type:"xhr",info:"Unexpected HTTP status "+d.status+".",xhr:d});d=null};"undefined"!==typeof d.onload?(d.onload=f,d.onerror=function(){if(c.onError)c.onError({type:"xhr",info:"Generic XHR error, check xhr object.",xhr:d})}):d.onreadystatechange=function(){4===d.readyState&&f()};e._config.timeoutInSec&&(d.timeout=1E3*e._config.timeoutInSec,d.ontimeout=function(){if(c.onError)c.onError({type:"xhr",info:"Timeout after "+d.timeout/1E3+"s. Use jsmediatags.Config.setXhrTimeout to override.",
+xhr:d})});d.overrideMimeType("text/plain; charset=x-user-defined");b&&this._setRequestHeader(d,"Range","bytes="+b[0]+"-"+b[1]);this._setRequestHeader(d,"If-Modified-Since","Sat, 01 Jan 1970 00:00:00 GMT");d.send(null)}},{key:"_setRequestHeader",value:function(a,b,c){0>e._config.disallowedXhrHeaders.indexOf(b.toLowerCase())&&a.setRequestHeader(b,c)}},{key:"_hasResponseHeader",value:function(a,b){a=a.getAllResponseHeaders();if(!a)return!1;a=a.split("\r\n");for(var d=[],c=0;c<a.length;c++)d[c]=a[c].split(":")[0].toLowerCase();
+return 0<=d.indexOf(b.toLowerCase())}},{key:"_getResponseHeader",value:function(a,b){return this._hasResponseHeader(a,b)?a.getResponseHeader(b):null}},{key:"getByteAt",value:function(a){return this._fileData.getByteAt(a).charCodeAt(0)&255}},{key:"_isWebWorker",value:function(){return"undefined"!==typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope}},{key:"_createXHRObject",value:function(){if("undefined"===typeof window&&!this._isWebWorker())return new (h("xhr2").XMLHttpRequest);if("undefined"!==
 typeof XMLHttpRequest)return new XMLHttpRequest;throw Error("XMLHttpRequest is not supported");}}],[{key:"canReadFile",value:function(a){return"string"===typeof a&&/^[a-z]+:\/\//i.test(a)}},{key:"setConfig",value:function(a){for(var b in a)a.hasOwnProperty(b)&&(this._config[b]=a[b]);a=this._config.disallowedXhrHeaders;for(b=0;b<a.length;b++)a[b]=a[b].toLowerCase()}}]);return e}(h("./MediaFileReader"));k(n,"_config",void 0);n._config={avoidHeadRequests:!1,disallowedXhrHeaders:[],timeoutInSec:30};p.exports=
-n},{"./ChunkedFileData":5,"./MediaFileReader":11,xhr2:2}],15:[function(h,p,n){function m(a,b){if(!(a instanceof b))throw new TypeError("Cannot call a class as a function");}function q(a,b){for(var d=0;d<b.length;d++){var c=b[d];c.enumerable=c.enumerable||!1;c.configurable=!0;"value"in c&&(c.writable=!0);Object.defineProperty(a,c.key,c)}}function t(a,b,d){b&&q(a.prototype,b);d&&q(a,d);return a}function f(a,b,d){b in a?Object.defineProperty(a,b,{value:d,enumerable:!0,configurable:!0,writable:!0}):a[b]=
-d;return a}function d(a,b){var d=0>a.offset&&(-a.offset>b||0<a.offset+a.length);return!(0<=a.offset&&a.offset+a.length>=b||d)}h("./MediaFileReader");var b=h("./XhrFileReader"),g=h("./BlobFileReader"),k=h("./ArrayFileReader");h("./MediaTagReader");var r=h("./ID3v1TagReader"),a=h("./ID3v2TagReader"),e=h("./MP4TagReader"),c=h("./FLACTagReader"),l=[],u=[],w=function(){function a(b){m(this,a);f(this,"_file",void 0);f(this,"_tagsToRead",void 0);f(this,"_fileReader",void 0);f(this,"_tagReader",void 0);this._file=
-b}t(a,[{key:"setTagsToRead",value:function(a){this._tagsToRead=a;return this}},{key:"setFileReader",value:function(a){this._fileReader=a;return this}},{key:"setTagReader",value:function(a){this._tagReader=a;return this}},{key:"read",value:function(a){var b=new (this._getFileReader())(this._file),d=this;b.init({onSuccess:function(){d._getTagReader(b,{onSuccess:function(c){(new c(b)).setTagsToRead(d._tagsToRead).read(a)},onError:a.onError})},onError:a.onError})}},{key:"_getFileReader",value:function(){return this._fileReader?
-this._fileReader:this._findFileReader()}},{key:"_findFileReader",value:function(){for(var a=0;a<l.length;a++)if(l[a].canReadFile(this._file))return l[a];throw Error("No suitable file reader found for "+this._file);}},{key:"_getTagReader",value:function(a,b){if(this._tagReader){var d=this._tagReader;setTimeout(function(){b.onSuccess(d)},1)}else this._findTagReader(a,b)}},{key:"_findTagReader",value:function(a,b){for(var c=[],e=[],f=a.getSize(),g=0;g<u.length;g++){var h=u[g].getTagIdentifierByteRange();
-d(h,f)&&(0<=h.offset&&h.offset<f/2||0>h.offset&&h.offset<-f/2?c.push(u[g]):e.push(u[g]))}var k=!1;g={onSuccess:function(){if(k){for(var c=0;c<u.length;c++){var e=u[c].getTagIdentifierByteRange();if(d(e,f)){try{var g=a.getBytesAt(0<=e.offset?e.offset:e.offset+f,e.length)}catch(x){if(b.onError)b.onError({type:"fileReader",info:x.message});return}if(u[c].canReadTagFormat(g)){b.onSuccess(u[c]);return}}}if(b.onError)b.onError({type:"tagFormat",info:"No suitable tag reader found"})}else k=!0},onError:b.onError};
-this._loadTagIdentifierRanges(a,c,g);this._loadTagIdentifierRanges(a,e,g)}},{key:"_loadTagIdentifierRanges",value:function(a,b,d){if(0===b.length)setTimeout(d.onSuccess,1);else{for(var c=[Number.MAX_VALUE,0],e=a.getSize(),f=0;f<b.length;f++){var g=b[f].getTagIdentifierByteRange(),h=0<=g.offset?g.offset:g.offset+e;g=h+g.length-1;c[0]=Math.min(h,c[0]);c[1]=Math.max(g,c[1])}a.loadRange(c,d)}}}]);return a}();n=function(){function a(){m(this,a)}t(a,null,[{key:"addFileReader",value:function(b){l.push(b);
-return a}},{key:"addTagReader",value:function(b){u.push(b);return a}},{key:"removeTagReader",value:function(b){b=u.indexOf(b);0<=b&&u.splice(b,1);return a}},{key:"EXPERIMENTAL_avoidHeadRequests",value:function(){b.setConfig({avoidHeadRequests:!0})}},{key:"setDisallowedXhrHeaders",value:function(a){b.setConfig({disallowedXhrHeaders:a})}},{key:"setXhrTimeoutInSec",value:function(a){b.setConfig({timeoutInSec:a})}}]);return a}();n.addFileReader(b).addFileReader(g).addFileReader(k).addTagReader(a).addTagReader(r).addTagReader(e).addTagReader(c);
+n},{"./ChunkedFileData":5,"./MediaFileReader":11,xhr2:2}],15:[function(h,p,n){function m(a,b){if(!(a instanceof b))throw new TypeError("Cannot call a class as a function");}function q(a,b){for(var c=0;c<b.length;c++){var d=b[c];d.enumerable=d.enumerable||!1;d.configurable=!0;"value"in d&&(d.writable=!0);Object.defineProperty(a,d.key,d)}}function t(a,b,c){b&&q(a.prototype,b);c&&q(a,c);return a}function f(a,b,c){b in a?Object.defineProperty(a,b,{value:c,enumerable:!0,configurable:!0,writable:!0}):a[b]=
+c;return a}function c(a,b){var c=0>a.offset&&(-a.offset>b||0<a.offset+a.length);return!(0<=a.offset&&a.offset+a.length>=b||c)}h("./MediaFileReader");var b=h("./XhrFileReader"),g=h("./BlobFileReader"),k=h("./ArrayFileReader");h("./MediaTagReader");var r=h("./ID3v1TagReader"),a=h("./ID3v2TagReader"),e=h("./MP4TagReader"),d=h("./FLACTagReader"),l=[],u=[],w=function(){function a(b){m(this,a);f(this,"_file",void 0);f(this,"_tagsToRead",void 0);f(this,"_fileReader",void 0);f(this,"_tagReader",void 0);this._file=
+b}t(a,[{key:"setTagsToRead",value:function(a){this._tagsToRead=a;return this}},{key:"setFileReader",value:function(a){this._fileReader=a;return this}},{key:"setTagReader",value:function(a){this._tagReader=a;return this}},{key:"read",value:function(a){var b=new (this._getFileReader())(this._file),c=this;b.init({onSuccess:function(){c._getTagReader(b,{onSuccess:function(d){(new d(b)).setTagsToRead(c._tagsToRead).read(a)},onError:a.onError})},onError:a.onError})}},{key:"_getFileReader",value:function(){return this._fileReader?
+this._fileReader:this._findFileReader()}},{key:"_findFileReader",value:function(){for(var a=0;a<l.length;a++)if(l[a].canReadFile(this._file))return l[a];throw Error("No suitable file reader found for "+this._file);}},{key:"_getTagReader",value:function(a,b){if(this._tagReader){var c=this._tagReader;setTimeout(function(){b.onSuccess(c)},1)}else this._findTagReader(a,b)}},{key:"_findTagReader",value:function(a,b){for(var d=[],e=[],f=a.getSize(),g=0;g<u.length;g++){var h=u[g].getTagIdentifierByteRange();
+c(h,f)&&(0<=h.offset&&h.offset<f/2||0>h.offset&&h.offset<-f/2?d.push(u[g]):e.push(u[g]))}var k=!1;g={onSuccess:function(){if(k){for(var d=0;d<u.length;d++){var e=u[d].getTagIdentifierByteRange();if(c(e,f)){try{var g=a.getBytesAt(0<=e.offset?e.offset:e.offset+f,e.length)}catch(x){if(b.onError)b.onError({type:"fileReader",info:x.message});return}if(u[d].canReadTagFormat(g)){b.onSuccess(u[d]);return}}}if(b.onError)b.onError({type:"tagFormat",info:"No suitable tag reader found"})}else k=!0},onError:b.onError};
+this._loadTagIdentifierRanges(a,d,g);this._loadTagIdentifierRanges(a,e,g)}},{key:"_loadTagIdentifierRanges",value:function(a,b,c){if(0===b.length)setTimeout(c.onSuccess,1);else{for(var d=[Number.MAX_VALUE,0],e=a.getSize(),f=0;f<b.length;f++){var g=b[f].getTagIdentifierByteRange(),h=0<=g.offset?g.offset:g.offset+e;g=h+g.length-1;d[0]=Math.min(h,d[0]);d[1]=Math.max(g,d[1])}a.loadRange(d,c)}}}]);return a}();n=function(){function a(){m(this,a)}t(a,null,[{key:"addFileReader",value:function(b){l.push(b);
+return a}},{key:"addTagReader",value:function(b){u.push(b);return a}},{key:"removeTagReader",value:function(b){b=u.indexOf(b);0<=b&&u.splice(b,1);return a}},{key:"EXPERIMENTAL_avoidHeadRequests",value:function(){b.setConfig({avoidHeadRequests:!0})}},{key:"setDisallowedXhrHeaders",value:function(a){b.setConfig({disallowedXhrHeaders:a})}},{key:"setXhrTimeoutInSec",value:function(a){b.setConfig({timeoutInSec:a})}}]);return a}();n.addFileReader(b).addFileReader(g).addFileReader(k).addTagReader(a).addTagReader(r).addTagReader(e).addTagReader(d);
 "undefined"===typeof process||process.browser||(h="undefined"!==typeof navigator&&"ReactNative"===navigator.product?h("./ReactNativeFileReader"):h("./NodeFileReader"),n.addFileReader(h));p.exports={read:function(a,b){(new w(a)).read(b)},Reader:w,Config:n}},{"./ArrayFileReader":3,"./BlobFileReader":4,"./FLACTagReader":6,"./ID3v1TagReader":7,"./ID3v2TagReader":9,"./MP4TagReader":10,"./MediaFileReader":11,"./MediaTagReader":12,"./NodeFileReader":1,"./ReactNativeFileReader":1,"./XhrFileReader":14}]},
 {},[15])(15)});
diff --git a/package.json b/package.json
index 8e0dc9a..6bddc6c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "jsmediatags",
-  "version": "3.9.3",
+  "version": "3.9.4",
   "description": "Media Tags Reader (ID3, MP4)",
   "author": {
     "name": "António Afonso",