wavefile - npm Package Compare versions

Comparing version 0.3.0 to 0.4.0

dist/wavefile-min.js

@@ -19,31 +19,33 @@ /*
 */
-var $jscomp=$jscomp||{};$jscomp.scope={};$jscomp.ASSUME_ES5=!1;$jscomp.ASSUME_NO_NATIVE_MAP=!1;$jscomp.ASSUME_NO_NATIVE_SET=!1;$jscomp.objectCreate=$jscomp.ASSUME_ES5||"function"==typeof Object.create?Object.create:function(a){var l=function(){};l.prototype=a;return new l};$jscomp.underscoreProtoCanBeSet=function(){var a={a:!0},l={};try{return l.__proto__=a,l.a}catch(h){}return!1};
+var $jscomp=$jscomp||{};$jscomp.scope={};$jscomp.ASSUME_ES5=!1;$jscomp.ASSUME_NO_NATIVE_MAP=!1;$jscomp.ASSUME_NO_NATIVE_SET=!1;$jscomp.objectCreate=$jscomp.ASSUME_ES5||"function"==typeof Object.create?Object.create:function(a){var l=function(){};l.prototype=a;return new l};$jscomp.underscoreProtoCanBeSet=function(){var a={a:!0},l={};try{return l.__proto__=a,l.a}catch(k){}return!1};
 $jscomp.setPrototypeOf="function"==typeof Object.setPrototypeOf?Object.setPrototypeOf:$jscomp.underscoreProtoCanBeSet()?function(a,l){a.__proto__=l;if(a.__proto__!==l)throw new TypeError(a+" is not extensible");return a}:null;
-$jscomp.inherits=function(a,l){a.prototype=$jscomp.objectCreate(l.prototype);a.prototype.constructor=a;if($jscomp.setPrototypeOf){var h=$jscomp.setPrototypeOf;h(a,l)}else for(h in l)if("prototype"!=h)if(Object.defineProperties){var f=Object.getOwnPropertyDescriptor(l,h);f&&Object.defineProperty(a,h,f)}else a[h]=l[h];a.superClass_=l.prototype};
-(function(a){function l(f){if(h[f])return h[f].exports;var k=h[f]={i:f,l:!1,exports:{}};a[f].call(k.exports,k,k.exports,l);k.l=!0;return k.exports}var h={};l.m=a;l.c=h;l.d=function(a,k,e){l.o(a,k)||Object.defineProperty(a,k,{configurable:!1,enumerable:!0,get:e})};l.n=function(a){var k=a&&a.__esModule?function(){return a["default"]}:function(){return a};l.d(k,"a",k);return k};l.o=function(a,k){return Object.prototype.hasOwnProperty.call(a,k)};l.p="";return l(l.s=5)})([function(a,l){function h(a,e){var b=
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-var k=h(0),e=new Float32Array(1),b=new Int32Array(e.buffer);a.exports.getBinary=f;a.exports.decodeFloat16=function(b){b=parseInt(f(b,!0),2);var a=(b&31744)>>10,d=b&1023;return(a?Math.pow(2,a-15)*(1+d/1024):d/1024*.00006103515625)*(b>>15?-1:1)};a.exports.decodeFloat64=function(b){if("0,0,0,0,0,0,0,0"==b.toString())return 0;b=f(b);for(var a="1"+b.substr(12,52),d=1,c=0,e=0;e<a.length;)c+=d*parseInt(a.charAt(e),10),d/=2,e++;return("1"==b.charAt(0)?-1:1)*c*Math.pow(2,parseInt(b.substr(1,11),2)-1023)};
-a.exports.toFloat64=function(b){if(0==b)return[0,0];var a=0;0>=b&&(a=2147483648,b=-b);var d=Math.floor(Math.log(b)/Math.log(2)),c=Math.floor(b/Math.pow(2,d)*Math.pow(2,52));b=c&4294967295;c/=Math.pow(2,32);return[a|d+1023<<20|c&1048575,b]};a.exports.toHalf=function(a){e[0]=a;var c=b[0];a=c>>16&32768;var d=c>>12&2047;c=c>>23&255;return 103>c?a:(a|c-112<<10|d>>1)+(d&1)}},function(a,l){a.exports.bitDepthOffsets={1:1,2:1,4:1,8:1,16:2,24:3,32:4,40:5,48:6,64:8};a.exports.maxBitDepth={2:4,4:16,8:256,16:65536,
-24:16777216,32:4294967296,40:1099511627776,48:281474976710656}},function(a,l,h){var f=h(6),k=h(12);a=function(a,b,c){b=void 0===b?!1:b;c=void 0===c?!1:c;var e=k.WaveFileHeader.call(this)||this;e.isFromScratch_=!1;e.enforceFact=b;e.enforceBext=c;e.WaveErrors={format:"Not a supported format.",wave:"Could not find the 'WAVE' chunk","fmt ":"Could not find the 'fmt ' chunk",data:"Could not find the 'data' chunk",fact:"Could not find the 'fact' chunk",bext:"Could not find the 'bext' chunk",bitDepth:"Invalid bit depth.",
-numChannels:"Invalid number of channels.",sampleRate:"Invalid sample rate."};e.samples_=[];e.bytes_=[];a&&e.fromBuffer(a);return e};$jscomp.inherits(a,k.WaveFileHeader);a.prototype.fromScratch=function(a,b,c,g,d){d=void 0===d?{}:d;d.container||(d.container="RIFF");this.isFromScratch_=!0;var e=parseInt(c,10)/8;this.chunkSize=36+g.length*e;this.subChunk1Size=16;this.byteRate=a*e*b;this.blockAlign=a*e;this.chunkId=d.container;this.format="WAVE";this.subChunk1Id="fmt ";this.audioFormat=this.headerFormats_[c];
-this.numChannels=a;this.sampleRate=b;this.bitsPerSample=parseInt(c,10);this.subChunk2Id="data";this.subChunk2Size=g.length*e;this.samples_=g;this.bitDepth_=c};a.prototype.fromBuffer=function(a){this.isFromScratch_=!1;this.readRIFFChunk_(a);this.readWAVEChunk_(a);this.readFmtChunk_(a);this.readFactChunk_(a);this.readBextChunk_(a);this.readDataChunk_(a)};a.prototype.toBuffer=function(){this.checkWriteInput_(this.numChannels,this.sampleRate,this.bitDepth_);this.samplesToBytes_();return new Uint8Array(this.createWaveFile_())};
-a.prototype.toRIFF=function(){this.chunkId="RIFF"};a.prototype.toRIFX=function(){this.chunkId="RIFX"};a.prototype.interleave=function(){var a=[],b,c,g=this.samples_[0].length;for(b=0;b<g;b++)for(c=0;c<this.samples_.length;c++)a.push(this.samples_[c][b]);this.samples_=a};a.prototype.deInterleave=function(){var a=[],b;for(b=0;b<this.numChannels;b++)a[b]=[];b=0;for(var c;b<this.samples_.length;){for(c=0;c<this.numChannels;c++)a[c].push(this.samples_[b+c]);b+=c}this.samples_=a};a.prototype.readRIFFChunk_=
-function(a){this.chunkId=f.fromBytes(a.slice(0,4),8,{"char":!0});if("RIFF"!=this.chunkId&&"RIFX"!=this.chunkId)throw Error(this.WaveErrors.format);this.chunkSize=f.fromBytes(a.slice(4,8),32,{be:"RIFX"==this.chunkId})[0]};a.prototype.readWAVEChunk_=function(a){if(-1===f.findString(a,"WAVE"))throw Error(this.WaveErrors.wave);this.format="WAVE"};a.prototype.readFmtChunk_=function(a){var b=f.findString(a,"fmt ");if(-1===b)throw Error(this.WaveErrors["fmt "]);var c={be:"RIFX"==this.chunkId};this.subChunk1Id=
-"fmt ";this.subChunk1Size=f.fromBytes(a.slice(b+4,b+8),32,c)[0];this.audioFormat=f.fromBytes(a.slice(b+8,b+10),16,c)[0];this.numChannels=f.fromBytes(a.slice(b+10,b+12),16,c)[0];this.sampleRate=f.fromBytes(a.slice(b+12,b+16),32,c)[0];this.byteRate=f.fromBytes(a.slice(b+16,b+20),32,c)[0];this.blockAlign=f.fromBytes(a.slice(b+20,b+22),16,c)[0];this.bitsPerSample=f.fromBytes(a.slice(b+22,b+24),16,c)[0];this.bitDepth_=3==this.audioFormat&&32==this.bitsPerSample?"32f":this.bitsPerSample.toString()};a.prototype.readFactChunk_=
-function(a){a=f.findString(a,"fact");if(-1===a&&this.enforceFact)throw Error(this.WaveErrors.fact);-1<a&&(this.factChunkId="fact")};a.prototype.readBextChunk_=function(a){a=f.findString(a,"bext");if(-1===a&&this.enforceBext)throw Error(this.WaveErrors.bext);-1<a&&(this.bextChunkId="bext")};a.prototype.readDataChunk_=function(a){var b=f.findString(a,"data");if(-1===b)throw Error(this.WaveErrors.data);this.subChunk2Id="data";this.subChunk2Size=f.fromBytes(a.slice(b+4,b+8),32,{be:"RIFX"==this.chunkId})[0];
-this.samplesFromBytes_(a,b)};a.prototype.samplesFromBytes_=function(a,b){var c={signed:8==this.bitsPerSample?!1:!0,be:"RIFX"==this.chunkId};32==this.bitsPerSample&&3==this.audioFormat&&(c.float=!0);a=a.slice(b+8,b+8+this.subChunk2Size);this.samples_=4==this.bitsPerSample?f.fromBytes(a,8,c):f.fromBytes(a,this.bitsPerSample,c)};a.prototype.checkWriteInput_=function(){if(!this.headerFormats_[this.bitDepth_])throw Error(this.WaveErrors.bitDepth);this.validateNumChannels_();this.validateSampleRate_()};
-a.prototype.validateNumChannels_=function(){var a=this.numChannels*this.bitsPerSample/8;if(1>this.numChannels||65535<a)throw Error(this.WaveErrors.numChannels);return!0};a.prototype.validateSampleRate_=function(){var a=this.bitsPerSample/8*this.numChannels*this.sampleRate;if(1>this.sampleRate||4294967295<a)throw Error(this.WaveErrors.sampleRate);return!0};a.prototype.samplesToBytes_=function(){var a={be:"RIFX"==this.chunkId};32==this.bitsPerSample&&3==this.audioFormat&&(a.float=!0);this.bytes_=f.toBytes(this.samples_,
-4==this.bitsPerSample?8:this.bitsPerSample,a);this.bytes_.length%2&&this.bytes_.push(0)};a.prototype.createWaveFile_=function(){var a=[];this.factChunkId&&(a=f.toBytes(this.factChunkId,8,{"char":!0}));var b={be:"RIFX"==this.chunkId};return f.toBytes(this.chunkId,8,{"char":!0}).concat(f.toBytes([this.chunkSize],32,b),f.toBytes(this.format,8,{"char":!0}),f.toBytes(this.subChunk1Id,8,{"char":!0}),f.toBytes([this.subChunk1Size],32,b),f.toBytes([this.audioFormat],16,b),f.toBytes([this.numChannels],16,
-b),f.toBytes([this.sampleRate],32,b),f.toBytes([this.byteRate],32,b),f.toBytes([this.blockAlign],16,b),f.toBytes([this.bitsPerSample],16,b),a,f.toBytes(this.subChunk2Id,8,{"char":!0}),f.toBytes([this.subChunk2Size],32,b),this.bytes_)};window.WaveFile=a},function(a,l,h){l=h(7);var f=h(9);h=h(11);a.exports.findString=function(a,e){for(var b,c=0;c<a.length;c++)if(b=f.fromBytes(a.slice(c,c+e.length),8,{"char":!0}),b==e)return c;return-1};a.exports.toBytes=l.toBytes;a.exports.fromBytes=f.fromBytes;a.exports.packBooleans=
-h.packBooleans;a.exports.unpackBooleans=h.unpackBooleans;a.exports.packCrumbs=h.packCrumbs;a.exports.unpackCrumbs=h.unpackCrumbs;a.exports.packNibbles=h.packNibbles;a.exports.unpackNibbles=h.unpackNibbles},function(a,l,h){function f(a,b,c){4==b?k(a,c,e.paddingNibble):2==b?k(a,c,e.paddingCrumb):1==b?k(a,c,function(){}):k(a,c)}function k(a,b,c){c=void 0===c?e.padding:c;if(10!=b)for(var d=0,g=a.length;d<g;)a[d]=a[d].toString(b),c(a,b,d),d++}h(1);var e=h(0),b=h(2),c=h(8),g=h(4);a.exports.toBytes=function(a,
-e,k){k=void 0===k?{}:k;var d=10;"base"in k&&(d=k.base);var h=k.char?c.writeString:c["write"+e+"Bit"+(k.float?"Float":"")];for(var l=0,m=0,p=a.length,n=[];l<p;)m=h(n,a,l,m),l++;a=n;k.be&&b.endianness(a,g.bitDepthOffsets[e]);f(a,e,d);k.buffer&&(a=new Uint8Array(a));return a}},function(a,l,h){function f(a,c,g,d){a[d++]=c[g]&255;a[d++]=c[g]>>>8&255;a[d++]=c[g]>>>16&255;a[d++]=c[g]>>>24&255;return d}var k=h(3),e=h(1);a.exports.write64Bit=function(a,c,g,d){c=k.toFloat64(c[g]);d=f(a,c,1,d);return f(a,c,
-0,d)};a.exports.write48Bit=function(a,c,g,d){a[d++]=c[g]&255;a[d++]=c[g]>>8&255;a[d++]=c[g]>>16&255;a[d++]=c[g]>>24&255;a[d++]=c[g]/4294967296&255;a[d++]=c[g]/1099511627776&255;return d};a.exports.write40Bit=function(a,c,g,d){a[d++]=c[g]&255;a[d++]=c[g]>>8&255;a[d++]=c[g]>>16&255;a[d++]=c[g]>>24&255;a[d++]=c[g]/4294967296&255;return d};a.exports.write32BitFloat=function(a,c,g,d){c=e.unpack(c[g]);a[d++]=c&255;a[d++]=c>>>8&255;a[d++]=c>>>16&255;a[d++]=c>>>24&255;return d};a.exports.write32Bit=f;a.exports.write24Bit=
-function(a,c,g,d){a[d++]=c[g]&255;a[d++]=c[g]>>>8&255;a[d++]=c[g]>>>16&255;return d};a.exports.write16Bit=function(a,c,g,d){a[d++]=c[g]&255;a[d++]=c[g]>>>8&255;return d};a.exports.write16BitFloat=function(a,c,g,d){c=k.toHalf(c[g]);a[d++]=c>>>8&255;a[d++]=c&255;return d};a.exports.write8Bit=function(a,c,g,d){a[d++]=c[g]&255;return d};a.exports.write4Bit=function(a,c,g,d){a[d++]=c[g]&15;return d};a.exports.write2Bit=function(a,c,g,d){a[d++]=0>c[g]?c[g]+4:c[g];return d};a.exports.write1Bit=function(a,
-c,g,d){a[d++]=c[g]?1:0;return d};a.exports.writeString=function(a,c,g,d){a[d++]=c.charCodeAt(g);return d}},function(a,l,h){function f(a,d,b,e){var g=[],f=0,h=0,l=c.bitDepthOffsets[d],m=a.length-(l-1);d=c.maxBitDepth[d];for(b=b?k:function(a,b){return a};f<m;)g[h]=b(e(a,f),d),f+=l,h++;return g}function k(a,b){a>parseInt(b/2,10)-1&&(a-=b);return a}var e=h(2),b=h(10),c=h(4);a.exports.fromBytes=function(a,c,k){k=void 0===k?{}:k;var d=10;"base"in k&&(d=k.base);k.be&&e.endianness(a,c/8);if(10!=d)for(var g=
-0,h=a.length;g<h;)a[g]=parseInt(a[g],d),g++;a=f(a,c,k.signed,k.char?b.readChar:b["read"+(2==c||4==c?8:c)+"Bit"+(k.float?"Float":"")]);k.char&&(a=a.join(""));return a}},function(a,l,h){function f(a,c,b){--b;for(var d="";0<=b;)d+=e.bytePadding(a[b+c].toString(2),2),b--;return parseInt(d,2)}function k(a,b){return(a[3+b]<<24|a[2+b]<<16|a[1+b]<<8|a[b])>>>0}var e=h(0),b=h(3),c=h(1);a.exports.readChar=function(a,b){return String.fromCharCode(a[b])};a.exports.read1Bit=function(a,b){return parseInt(a[b],2)};
-a.exports.read8Bit=function(a,b){return a[b]};a.exports.read16Bit=function(a,b){return a[1+b]<<8|a[b]};a.exports.read16BitFloat=function(a,c){return b.decodeFloat16(a.slice(c,c+2))};a.exports.read24Bit=function(a,b){return a[2+b]<<16|a[1+b]<<8|a[b]};a.exports.read32Bit=k;a.exports.read32BitFloat=function(a,b){return c.pack(k(a,b))};a.exports.read40Bit=function(a,b){return f(a,b,5)};a.exports.read48Bit=function(a,b){return f(a,b,6)};a.exports.read64Bit=function(a,c){return b.decodeFloat64(a.slice(c,
-c+8))}},function(a,l,h){var f=h(0);a.exports.packBooleans=function(a){var e=[],b=0,c=0;f.fixByteArraySize(a,8);for(var g=a.length-7;b<g;)e[c++]=parseInt(a[b].toString(2)+a[b+1].toString(2)+a[b+2].toString(2)+a[b+3].toString(2)+a[b+4].toString(2)+a[b+5].toString(2)+a[b+6].toString(2)+a[b+7].toString(2),2),b+=8;return e};a.exports.unpackBooleans=function(a){for(var e=[],b=0,c=0,g=a.length,d;b<g;)d=f.lPadZeros(a[b].toString(2),8),e[c++]=parseInt(d[0],2),e[c++]=parseInt(d[1],2),e[c++]=parseInt(d[2],2),
-e[c++]=parseInt(d[3],2),e[c++]=parseInt(d[4],2),e[c++]=parseInt(d[5],2),e[c++]=parseInt(d[6],2),e[c++]=parseInt(d[7],2),b++;return e};a.exports.packCrumbs=function(a){var e=[],b=0,c=0;f.fixByteArraySize(a,4);for(var g=a.length-3;b<g;)e[c++]=parseInt(f.lPadZeros(a[b].toString(2),2)+f.lPadZeros(a[b+1].toString(2),2)+f.lPadZeros(a[b+2].toString(2),2)+f.lPadZeros(a[b+3].toString(2),2),2),b+=4;return e};a.exports.unpackCrumbs=function(a){var e=[],b=0,c=0,g=a.length;for(console.log(g);b<g;){var d=f.lPadZeros(a[b].toString(2),
-8);e[c++]=parseInt(d[0]+d[1],2);e[c++]=parseInt(d[2]+d[3],2);e[c++]=parseInt(d[4]+d[5],2);e[c++]=parseInt(d[6]+d[7],2);b++}return e};a.exports.packNibbles=function(a){var e=[],b=0,c=0,f=a.length;for(f%2&&a.push(0);b<f;)e[c++]=parseInt(a[b].toString(16)+a[b+1].toString(16),16),b+=2;return e};a.exports.unpackNibbles=function(a){for(var e=[],b=0,c=0,f=a.length;b<f;)e[c++]=parseInt(a[b].toString(16)[0],16),e[c++]=parseInt(a[b].toString(16)[1],16),b++;return e}},function(a,l){a.exports.WaveFileHeader=
-function(){this.chunkId="";this.chunkSize=0;this.format=this.subChunk1Id="";this.cbSize=this.bitsPerSample=this.blockAlign=this.byteRate=this.sampleRate=this.numChannels=this.audioFormat=this.subChunk1Size=0;this.factChunkId="";this.factChunkSize=4;this.dwSampleLength=0;this.subChunk2Id="";this.subChunk2Size=0;this.bextChunkId="";this.headerFormats_={4:17,8:1,16:1,24:1,32:1,"32f":3,64:3}}}]);
+$jscomp.inherits=function(a,l){a.prototype=$jscomp.objectCreate(l.prototype);a.prototype.constructor=a;if($jscomp.setPrototypeOf){var k=$jscomp.setPrototypeOf;k(a,l)}else for(k in l)if("prototype"!=k)if(Object.defineProperties){var g=Object.getOwnPropertyDescriptor(l,k);g&&Object.defineProperty(a,k,g)}else a[k]=l[k];a.superClass_=l.prototype};
+(function(a){function l(g){if(k[g])return k[g].exports;var f=k[g]={i:g,l:!1,exports:{}};a[g].call(f.exports,f,f.exports,l);f.l=!0;return f.exports}var k={};l.m=a;l.c=k;l.d=function(a,f,e){l.o(a,f)||Object.defineProperty(a,f,{configurable:!1,enumerable:!0,get:e})};l.n=function(a){var f=a&&a.__esModule?function(){return a["default"]}:function(){return a};l.d(f,"a",f);return f};l.o=function(a,f){return Object.prototype.hasOwnProperty.call(a,f)};l.p="";return l(l.s=5)})([function(a,l){function k(a,e){var b=
+a.length+1;2==e?b=8:16==e&&(b=2);return g(a,b)}function g(a,e){for(;a.length<e;)a="0"+a;return a}a.exports.fixByteArraySize=function(a,e){var b=0,c=a.length%e;if(c)for(c=-1*(c-e);b<c;)a.push(0),b++};a.exports.padding=function(a,e,b){a[b]=k(a[b],e)};a.exports.paddingNibble=function(a,e,b){2==e&&4>a[b].length&&(a[b]=Array(5-a[b].length).join("0")+a[b])};a.exports.paddingCrumb=function(a,e,b){(2==e||16==e)&&2>a[b].length&&(a[b]="0"+a[b])};a.exports.bytePadding=k;a.exports.lPadZeros=g},function(a,l){function k(a){g[0]=
+a;return f[0]}l=new Int8Array(4);var g=new Int32Array(l.buffer,0,1),f=new Float32Array(l.buffer,0,1);a.exports=k;a.exports.pack=k;a.exports.unpack=function(a){f[0]=a;return g[0]}},function(a,l){a.exports.BitDepthOffsets={1:1,2:1,4:1,8:1,16:2,24:3,32:4,40:5,48:6,64:8};a.exports.BitDepthMaxValues={2:4,4:16,8:256,16:65536,24:16777216,32:4294967296,40:1099511627776,48:281474976710656}},function(a,l){a.exports.endianness=function(a,g){for(var f=a.length,e=0;e<f;){for(var b,c=a,h=e,d=0,m=g-1,k=parseInt(g/
+2,10);d<k;)b=c[h+d],c[h+d]=c[h+m],c[h+m]=b,d++,m--;e+=g}return a}},function(a,l,k){function g(b,a){a=void 0===a?!1:a;for(var d="",c=0,h=b.length;c<h;){var e=f.lPadZeros(b[c].toString(2),8);d=a?d+e:e+d;c++}return d}var f=k(0),e=new Float32Array(1),b=new Int32Array(e.buffer);a.exports.getBinary=g;a.exports.decodeFloat16=function(b){b=parseInt(g(b,!0),2);var c=(b&31744)>>10,d=b&1023;return(c?Math.pow(2,c-15)*(1+d/1024):d/1024*.00006103515625)*(b>>15?-1:1)};a.exports.decodeFloat64=function(b){if("0,0,0,0,0,0,0,0"==
+b.toString())return 0;b=g(b);for(var a="1"+b.substr(12,52),d=1,c=0,e=0;e<a.length;)c+=d*parseInt(a.charAt(e),10),d/=2,e++;return("1"==b.charAt(0)?-1:1)*c*Math.pow(2,parseInt(b.substr(1,11),2)-1023)};a.exports.toFloat64=function(b){if(0==b)return[0,0];var a=0;0>=b&&(a=2147483648,b=-b);var d=Math.floor(Math.log(b)/Math.log(2)),c=Math.floor(b/Math.pow(2,d)*Math.pow(2,52));b=c&4294967295;c/=Math.pow(2,32);return[a|d+1023<<20|c&1048575,b]};a.exports.toHalf=function(a){e[0]=a;var c=b[0];a=c>>16&32768;var d=
+c>>12&2047;c=c>>23&255;return 103>c?a:(a|c-112<<10|d>>1)+(d&1)}},function(a,l,k){var g=k(6),f=k(12);a=function(a,b,c){b=void 0===b?!1:b;c=void 0===c?!1:c;var e=f.WaveFileHeader.call(this)||this;e.isFromScratch_=!1;e.enforceFact=b;e.enforceBext=c;e.WaveErrors={format:"Not a supported format.",wave:"Could not find the 'WAVE' chunk","fmt ":"Could not find the 'fmt ' chunk",data:"Could not find the 'data' chunk",fact:"Could not find the 'fact' chunk",bext:"Could not find the 'bext' chunk",bitDepth:"Invalid bit depth.",
+numChannels:"Invalid number of channels.",sampleRate:"Invalid sample rate."};e.samples_=[];e.bytes_=[];a&&e.fromBuffer(a);return e};$jscomp.inherits(a,f.WaveFileHeader);a.prototype.fromScratch=function(a,b,c,h,d){d=void 0===d?{}:d;d.container||(d.container="RIFF");this.isFromScratch_=!0;var e=parseInt(c,10)/8;this.chunkSize=36+h.length*e;this.subChunk1Size=16;this.byteRate=a*e*b;this.blockAlign=a*e;this.chunkId=d.container;this.format="WAVE";this.subChunk1Id="fmt ";this.audioFormat=this.headerFormats_[c];
+this.numChannels=a;this.sampleRate=b;this.bitsPerSample=parseInt(c,10);this.subChunk2Id="data";this.subChunk2Size=h.length*e;this.samples_=h;this.bitDepth_=c};a.prototype.fromBuffer=function(a){this.isFromScratch_=!1;this.readRIFFChunk_(a);this.readWAVEChunk_(a);this.readFmtChunk_(a);this.readFactChunk_(a);this.readBextChunk_(a);this.readDataChunk_(a)};a.prototype.toBuffer=function(){this.checkWriteInput_(this.numChannels,this.sampleRate,this.bitDepth_);this.samplesToBytes_();return new Uint8Array(this.createWaveFile_())};
+a.prototype.toRIFF=function(){this.chunkId="RIFF"};a.prototype.toRIFX=function(){this.chunkId="RIFX"};a.prototype.toBitDepth=function(a){if(a!=this.bitDepth_){var b=this.bitDepth_;this.bitDepth_=a;try{this.validateBitDepth_()}catch(n){throw this.bitDepth_=b,n;}a=this.samples_.length;for(var c=[],e=parseInt(g.BitDepthMaxValues[parseInt(b,10)]/2,10),d=parseInt((g.BitDepthMaxValues[parseInt(this.bitDepth_,10)]-1)/2,10),f=0;f<a;f++)"8"==b&&(this.samples_[f]-=128),"32f"==this.bitDepth_||"64"==this.bitDepth_?
+"32f"==b||"64"==b?c.push(this.samples_[f]):c.push(this.samples_[f]/e):("32f"==b||"64"==b?c.push(this.samples_[f]*d):c.push(parseInt(this.samples_[f]/e*d,10)),0>c[f]&&c[f]--,"8"==this.bitDepth_&&(c[f]+=128));this.fromScratch(this.numChannels,this.sampleRate,this.bitDepth_,c,{container:this.chunkId})}};a.prototype.interleave=function(){var a=[],b,c,h=this.samples_[0].length;for(b=0;b<h;b++)for(c=0;c<this.samples_.length;c++)a.push(this.samples_[c][b]);this.samples_=a};a.prototype.deInterleave=function(){var a=
+[],b;for(b=0;b<this.numChannels;b++)a[b]=[];b=0;for(var c;b<this.samples_.length;){for(c=0;c<this.numChannels;c++)a[c].push(this.samples_[b+c]);b+=c}this.samples_=a};a.prototype.readRIFFChunk_=function(a){this.chunkId=g.fromBytes(a.slice(0,4),8,{"char":!0});if("RIFF"!=this.chunkId&&"RIFX"!=this.chunkId)throw Error(this.WaveErrors.format);this.chunkSize=g.fromBytes(a.slice(4,8),32,{be:"RIFX"==this.chunkId})[0]};a.prototype.readWAVEChunk_=function(a){if(-1===g.findString(a,"WAVE"))throw Error(this.WaveErrors.wave);
+this.format="WAVE"};a.prototype.readFmtChunk_=function(a){var b=g.findString(a,"fmt ");if(-1===b)throw Error(this.WaveErrors["fmt "]);var c={be:"RIFX"==this.chunkId};this.subChunk1Id="fmt ";this.subChunk1Size=g.fromBytes(a.slice(b+4,b+8),32,c)[0];this.audioFormat=g.fromBytes(a.slice(b+8,b+10),16,c)[0];this.numChannels=g.fromBytes(a.slice(b+10,b+12),16,c)[0];this.sampleRate=g.fromBytes(a.slice(b+12,b+16),32,c)[0];this.byteRate=g.fromBytes(a.slice(b+16,b+20),32,c)[0];this.blockAlign=g.fromBytes(a.slice(b+
+20,b+22),16,c)[0];this.bitsPerSample=g.fromBytes(a.slice(b+22,b+24),16,c)[0];this.bitDepth_=3==this.audioFormat&&32==this.bitsPerSample?"32f":this.bitsPerSample.toString()};a.prototype.readFactChunk_=function(a){a=g.findString(a,"fact");if(-1===a&&this.enforceFact)throw Error(this.WaveErrors.fact);-1<a&&(this.factChunkId="fact")};a.prototype.readBextChunk_=function(a){a=g.findString(a,"bext");if(-1===a&&this.enforceBext)throw Error(this.WaveErrors.bext);-1<a&&(this.bextChunkId="bext")};a.prototype.readDataChunk_=
+function(a){var b=g.findString(a,"data");if(-1===b)throw Error(this.WaveErrors.data);this.subChunk2Id="data";this.subChunk2Size=g.fromBytes(a.slice(b+4,b+8),32,{be:"RIFX"==this.chunkId})[0];this.samplesFromBytes_(a,b)};a.prototype.samplesFromBytes_=function(a,b){var c={signed:8==this.bitsPerSample?!1:!0,be:"RIFX"==this.chunkId};32==this.bitsPerSample&&3==this.audioFormat&&(c.float=!0);a=a.slice(b+8,b+8+this.subChunk2Size);this.samples_=4==this.bitsPerSample?g.fromBytes(a,8,c):g.fromBytes(a,this.bitsPerSample,
+c)};a.prototype.checkWriteInput_=function(){this.validateBitDepth_();this.validateNumChannels_();this.validateSampleRate_()};a.prototype.validateBitDepth_=function(){if(!this.headerFormats_[this.bitDepth_])throw Error(this.WaveErrors.bitDepth);return!0};a.prototype.validateNumChannels_=function(){var a=this.numChannels*this.bitsPerSample/8;if(1>this.numChannels||65535<a)throw Error(this.WaveErrors.numChannels);return!0};a.prototype.validateSampleRate_=function(){var a=this.bitsPerSample/8*this.numChannels*
+this.sampleRate;if(1>this.sampleRate||4294967295<a)throw Error(this.WaveErrors.sampleRate);return!0};a.prototype.samplesToBytes_=function(){var a={be:"RIFX"==this.chunkId};32==this.bitsPerSample&&3==this.audioFormat&&(a.float=!0);this.bytes_=g.toBytes(this.samples_,4==this.bitsPerSample?8:this.bitsPerSample,a);this.bytes_.length%2&&this.bytes_.push(0)};a.prototype.createWaveFile_=function(){var a=[];this.factChunkId&&(a=g.toBytes(this.factChunkId,8,{"char":!0}));var b={be:"RIFX"==this.chunkId};return g.toBytes(this.chunkId,
+8,{"char":!0}).concat(g.toBytes([this.chunkSize],32,b),g.toBytes(this.format,8,{"char":!0}),g.toBytes(this.subChunk1Id,8,{"char":!0}),g.toBytes([this.subChunk1Size],32,b),g.toBytes([this.audioFormat],16,b),g.toBytes([this.numChannels],16,b),g.toBytes([this.sampleRate],32,b),g.toBytes([this.byteRate],32,b),g.toBytes([this.blockAlign],16,b),g.toBytes([this.bitsPerSample],16,b),a,g.toBytes(this.subChunk2Id,8,{"char":!0}),g.toBytes([this.subChunk2Size],32,b),this.bytes_)};window.WaveFile=a},function(a,
+l,k){l=k(7);var g=k(9),f=k(11);k=k(2);a.exports.findString=function(a,b){for(var c,h=0;h<a.length;h++)if(c=g.fromBytes(a.slice(h,h+b.length),8,{"char":!0}),c==b)return h;return-1};a.exports.toBytes=l.toBytes;a.exports.fromBytes=g.fromBytes;a.exports.packBooleans=f.packBooleans;a.exports.unpackBooleans=f.unpackBooleans;a.exports.packCrumbs=f.packCrumbs;a.exports.unpackCrumbs=f.unpackCrumbs;a.exports.packNibbles=f.packNibbles;a.exports.unpackNibbles=f.unpackNibbles;a.exports.BitDepthOffsets=k.BitDepthOffsets;
+a.exports.BitDepthMaxValues=k.BitDepthMaxValues},function(a,l,k){function g(a,b,c){4==b?f(a,c,e.paddingNibble):2==b?f(a,c,e.paddingCrumb):1==b?f(a,c,function(){}):f(a,c)}function f(a,b,c){c=void 0===c?e.padding:c;if(10!=b)for(var d=0,h=a.length;d<h;)a[d]=a[d].toString(b),c(a,b,d),d++}k(1);var e=k(0),b=k(3),c=k(8),h=k(2);a.exports.toBytes=function(a,f,e){e=void 0===e?{}:e;var d=10;"base"in e&&(d=e.base);var k=e.char?c.writeString:c["write"+f+"Bit"+(e.float?"Float":"")];for(var l=0,m=0,n=a.length,p=
+[];l<n;)m=k(p,a,l,m),l++;a=p;e.be&&b.endianness(a,h.BitDepthOffsets[f]);g(a,f,d);e.buffer&&(a=new Uint8Array(a));return a}},function(a,l,k){function g(a,c,h,d){a[d++]=c[h]&255;a[d++]=c[h]>>>8&255;a[d++]=c[h]>>>16&255;a[d++]=c[h]>>>24&255;return d}var f=k(4),e=k(1);a.exports.write64Bit=function(a,c,h,d){c=f.toFloat64(c[h]);d=g(a,c,1,d);return g(a,c,0,d)};a.exports.write48Bit=function(a,c,h,d){a[d++]=c[h]&255;a[d++]=c[h]>>8&255;a[d++]=c[h]>>16&255;a[d++]=c[h]>>24&255;a[d++]=c[h]/4294967296&255;a[d++]=
+c[h]/1099511627776&255;return d};a.exports.write40Bit=function(a,c,h,d){a[d++]=c[h]&255;a[d++]=c[h]>>8&255;a[d++]=c[h]>>16&255;a[d++]=c[h]>>24&255;a[d++]=c[h]/4294967296&255;return d};a.exports.write32BitFloat=function(a,c,h,d){c=e.unpack(c[h]);a[d++]=c&255;a[d++]=c>>>8&255;a[d++]=c>>>16&255;a[d++]=c>>>24&255;return d};a.exports.write32Bit=g;a.exports.write24Bit=function(a,c,h,d){a[d++]=c[h]&255;a[d++]=c[h]>>>8&255;a[d++]=c[h]>>>16&255;return d};a.exports.write16Bit=function(a,c,h,d){a[d++]=c[h]&
+255;a[d++]=c[h]>>>8&255;return d};a.exports.write16BitFloat=function(a,c,h,d){c=f.toHalf(c[h]);a[d++]=c>>>8&255;a[d++]=c&255;return d};a.exports.write8Bit=function(a,c,h,d){a[d++]=c[h]&255;return d};a.exports.write4Bit=function(a,c,h,d){a[d++]=c[h]&15;return d};a.exports.write2Bit=function(a,c,h,d){a[d++]=0>c[h]?c[h]+4:c[h];return d};a.exports.write1Bit=function(a,c,h,d){a[d++]=c[h]?1:0;return d};a.exports.writeString=function(a,c,h,d){a[d++]=c.charCodeAt(h);return d}},function(a,l,k){function g(a,
+b,e,g){var d=[],h=0,k=0,l=c.BitDepthOffsets[b],m=a.length-(l-1);b=c.BitDepthMaxValues[b];for(e=e?f:function(a,b){return a};h<m;)d[k]=e(g(a,h),b),h+=l,k++;return d}function f(a,b){a>parseInt(b/2,10)-1&&(a-=b);return a}var e=k(3),b=k(10),c=k(2);a.exports.fromBytes=function(a,c,f){f=void 0===f?{}:f;var d=10;"base"in f&&(d=f.base);f.be&&e.endianness(a,c/8);if(10!=d)for(var h=0,k=a.length;h<k;)a[h]=parseInt(a[h],d),h++;a=g(a,c,f.signed,f.char?b.readChar:b["read"+(2==c||4==c?8:c)+"Bit"+(f.float?"Float":
+"")]);f.char&&(a=a.join(""));return a}},function(a,l,k){function g(a,c,b){--b;for(var d="";0<=b;)d+=e.bytePadding(a[b+c].toString(2),2),b--;return parseInt(d,2)}function f(a,b){return(a[3+b]<<24|a[2+b]<<16|a[1+b]<<8|a[b])>>>0}var e=k(0),b=k(4),c=k(1);a.exports.readChar=function(a,b){return String.fromCharCode(a[b])};a.exports.read1Bit=function(a,b){return parseInt(a[b],2)};a.exports.read8Bit=function(a,b){return a[b]};a.exports.read16Bit=function(a,b){return a[1+b]<<8|a[b]};a.exports.read16BitFloat=
+function(a,c){return b.decodeFloat16(a.slice(c,c+2))};a.exports.read24Bit=function(a,b){return a[2+b]<<16|a[1+b]<<8|a[b]};a.exports.read32Bit=f;a.exports.read32BitFloat=function(a,b){return c.pack(f(a,b))};a.exports.read40Bit=function(a,b){return g(a,b,5)};a.exports.read48Bit=function(a,b){return g(a,b,6)};a.exports.read64Bit=function(a,c){return b.decodeFloat64(a.slice(c,c+8))}},function(a,l,k){var g=k(0);a.exports.packBooleans=function(a){var e=[],b=0,c=0;g.fixByteArraySize(a,8);for(var f=a.length-
+7;b<f;)e[c++]=parseInt(a[b].toString(2)+a[b+1].toString(2)+a[b+2].toString(2)+a[b+3].toString(2)+a[b+4].toString(2)+a[b+5].toString(2)+a[b+6].toString(2)+a[b+7].toString(2),2),b+=8;return e};a.exports.unpackBooleans=function(a){for(var e=[],b=0,c=0,f=a.length,d;b<f;)d=g.lPadZeros(a[b].toString(2),8),e[c++]=parseInt(d[0],2),e[c++]=parseInt(d[1],2),e[c++]=parseInt(d[2],2),e[c++]=parseInt(d[3],2),e[c++]=parseInt(d[4],2),e[c++]=parseInt(d[5],2),e[c++]=parseInt(d[6],2),e[c++]=parseInt(d[7],2),b++;return e};
+a.exports.packCrumbs=function(a){var e=[],b=0,c=0;g.fixByteArraySize(a,4);for(var f=a.length-3;b<f;)e[c++]=parseInt(g.lPadZeros(a[b].toString(2),2)+g.lPadZeros(a[b+1].toString(2),2)+g.lPadZeros(a[b+2].toString(2),2)+g.lPadZeros(a[b+3].toString(2),2),2),b+=4;return e};a.exports.unpackCrumbs=function(a){var e=[],b=0,c=0,f=a.length;for(console.log(f);b<f;){var d=g.lPadZeros(a[b].toString(2),8);e[c++]=parseInt(d[0]+d[1],2);e[c++]=parseInt(d[2]+d[3],2);e[c++]=parseInt(d[4]+d[5],2);e[c++]=parseInt(d[6]+
+d[7],2);b++}return e};a.exports.packNibbles=function(a){var e=[],b=0,c=0,f=a.length;for(f%2&&a.push(0);b<f;)e[c++]=parseInt(a[b].toString(16)+a[b+1].toString(16),16),b+=2;return e};a.exports.unpackNibbles=function(a){for(var e=[],b=0,c=0,f=a.length;b<f;)e[c++]=parseInt(a[b].toString(16)[0],16),e[c++]=parseInt(a[b].toString(16)[1],16),b++;return e}},function(a,l){a.exports.WaveFileHeader=function(){this.chunkId="";this.chunkSize=0;this.format=this.subChunk1Id="";this.cbSize=this.bitsPerSample=this.blockAlign=
+this.byteRate=this.sampleRate=this.numChannels=this.audioFormat=this.subChunk1Size=0;this.factChunkId="";this.factChunkSize=4;this.dwSampleLength=0;this.subChunk2Id="";this.subChunk2Size=0;this.bextChunkId="";this.headerFormats_={4:17,8:1,16:1,24:1,32:1,"32f":3,64:3}}}]);

dist/wavefile.js

@@ -195,2 +195,48 @@ /******/ (function(modules) { // webpackBootstrap
 
+/*
+ * bit-depth: Configurations based on bit depth.
+ * Copyright (c) 2017 Rafael da Silva Rocha.
+ * https://github.com/rochars/byte-data
+ */
+
+/**
+ * Offset for reading each bit depth.
+ * @enum {number}
+ */
+const BitDepthOffsets = {
+    1: 1,
+    2: 1,
+    4: 1,
+    8: 1,
+    16: 2,
+    24: 3,
+    32: 4,
+    40: 5,
+    48: 6,
+    64: 8
+};
+
+/**
+ * Max value for each bit depth.
+ * @enum {number}
+ */
+const BitDepthMaxValues = {
+    2: 4,
+    4: 16,
+    8: 256,
+    16: 65536,
+    24: 16777216,
+    32: 4294967296,
+    40: 1099511627776,
+    48: 281474976710656
+};
+
+module.exports.BitDepthOffsets = BitDepthOffsets;
+module.exports.BitDepthMaxValues = BitDepthMaxValues;
+
+
+/***/ }),
+/* 3 */
+/***/ (function(module, exports) {
+
 /*!
@@ -248,3 +294,3 @@ * endianness: Swap byte endianness in a array of bytes.
 /***/ }),
-/* 3 */
+/* 4 */
 /***/ (function(module, exports, __webpack_require__) {
@@ -377,48 +423,2 @@
 /***/ }),
-/* 4 */
-/***/ (function(module, exports) {
-
-/*
- * bit-depth: Configurations based on bit depth.
- * Copyright (c) 2017 Rafael da Silva Rocha.
- * https://github.com/rochars/byte-data
- */
-
-/**
- * Offset for reading each bit depth.
- * @enum {number}
- */
-const bitDepthOffsets = {
-    1: 1,
-    2: 1,
-    4: 1,
-    8: 1,
-    16: 2,
-    24: 3,
-    32: 4,
-    40: 5,
-    48: 6,
-    64: 8
-};
-
-/**
- * Max value for each bit depth.
- * @enum {number}
- */
-const maxBitDepth = {
-    2: 4,
-    4: 16,
-    8: 256,
-    16: 65536,
-    24: 16777216,
-    32: 4294967296,
-    40: 1099511627776,
-    48: 281474976710656
-};
-
-module.exports.bitDepthOffsets = bitDepthOffsets;
-module.exports.maxBitDepth = maxBitDepth;
-
-
-/***/ }),
 /* 5 */
@@ -541,2 +541,3 @@ /***/ (function(module, exports, __webpack_require__) {
      * Turn the file to RIFF.
+     * All values will be little-endian when writing.
      */
@@ -549,2 +550,3 @@ toRIFF() {
      * Turn the file to RIFX.
+     * All values but FourCCs will be big-endian when writing.
      */
@@ -556,2 +558,64 @@ toRIFX() {
     /**
+     * Change the bit depth of the data.
+     * @param {string} bitDepth The new bit depth of the data.
+     *      One of "8", "16", "24", "32", "32f", "64"
+     */
+    toBitDepth(bitDepth) {
+        if (bitDepth == this.bitDepth_) {
+            return;
+        }
+        let originalBitDepth = this.bitDepth_;
+        this.bitDepth_ = bitDepth;
+        try {
+            this.validateBitDepth_();
+        } catch(err) {
+            this.bitDepth_ = originalBitDepth;
+            throw err;
+        }
+        let len = this.samples_.length;
+        let newSamples = [];
+
+        // change the bit depth of the samples
+        let oldMaxValue =
+            parseInt((byteData.BitDepthMaxValues[parseInt(originalBitDepth, 10)]) / 2, 10);
+        let newMaxValue =
+            parseInt((byteData.BitDepthMaxValues[parseInt(this.bitDepth_, 10)] -1) / 2, 10);
+
+        for (let i=0; i<len;i++) {
+            if (originalBitDepth == "8") {
+                this.samples_[i] -= 128;
+            }
+            if (this.bitDepth_ == "32f" || this.bitDepth_ == "64") {
+                if (originalBitDepth == "32f" || originalBitDepth == "64") {
+                    newSamples.push(this.samples_[i]);
+                } else {
+                    newSamples.push(this.samples_[i] / oldMaxValue);
+                }
+            }else {
+                if (originalBitDepth == "32f" || originalBitDepth == "64" ) {
+                    newSamples.push(this.samples_[i] * newMaxValue);
+                } else {
+                    newSamples.push(
+                        parseInt((this.samples_[i] / oldMaxValue) * newMaxValue, 10)
+                    );
+                }
+                if (newSamples[i] < 0) {
+                    newSamples[i]--;
+                }
+                if (this.bitDepth_ == "8") {
+                    newSamples[i] += 128;
+                }
+            }  
+        }
+        // recreate the file with the new samples
+        this.fromScratch(
+            this.numChannels,
+            this.sampleRate,
+            this.bitDepth_,
+            newSamples,
+            {"container": this.chunkId}
+        );
+    }
+
+    /**
      * Interleave multi-channel samples.
@@ -737,7 +801,19 @@ */
     checkWriteInput_() {
+        this.validateBitDepth_();
+        this.validateNumChannels_();
+        this.validateSampleRate_();
+    }
+
+    /**
+     * Validate the bit depth.
+     * @param {number} numChannels The number of channels
+     * @param {string} bitDepth The audio bit depth.
+     *     Should be one of "8", "16", "24", "32", "32f", "64".
+     * @throws {Error} If any argument does not meet the criteria.
+     */
+    validateBitDepth_() {
         if (!this.headerFormats_[this.bitDepth_]) {
             throw new Error(this.WaveErrors.bitDepth);
         }
-        this.validateNumChannels_();
-        this.validateSampleRate_();
+        return true;
     }
@@ -839,2 +915,3 @@
 let bitPacker = __webpack_require__(11);
+let bitDepth = __webpack_require__(2);
 
@@ -872,3 +949,6 @@ /**
 
+module.exports.BitDepthOffsets = bitDepth.BitDepthOffsets;
+module.exports.BitDepthMaxValues = bitDepth.BitDepthMaxValues;
 
+
 /***/ }),
@@ -886,5 +966,5 @@ /* 7 */
 const pad = __webpack_require__(0);
-const endianness = __webpack_require__(2);
+const endianness = __webpack_require__(3);
 const writer = __webpack_require__(8);
-const bitDepths = __webpack_require__(4);
+const bitDepths = __webpack_require__(2);
 
@@ -972,3 +1052,3 @@ /**
     if (isBigEndian) {
-        endianness.endianness(bytes, bitDepths.bitDepthOffsets[bitDepth]);
+        endianness.endianness(bytes, bitDepths.BitDepthOffsets[bitDepth]);
     }
@@ -1008,3 +1088,3 @@ }
 
-const float = __webpack_require__(3);
+const float = __webpack_require__(4);
 const intBits = __webpack_require__(1);
@@ -1126,5 +1206,5 @@
 
-const endianness = __webpack_require__(2);
+const endianness = __webpack_require__(3);
 const reader = __webpack_require__(10);
-const bitDepths = __webpack_require__(4);
+const bitDepths = __webpack_require__(2);
 
@@ -1174,5 +1254,5 @@ /**
     let j = 0;
-    let offset = bitDepths.bitDepthOffsets[bitDepth];
+    let offset = bitDepths.BitDepthOffsets[bitDepth];
     let len = bytes.length - (offset -1);
-    let maxBitDepthValue = bitDepths.maxBitDepth[bitDepth];
+    let maxBitDepthValue = bitDepths.BitDepthMaxValues[bitDepth];
     let signFunction = isSigned ? signed : function(x,y){return x;};
@@ -1260,3 +1340,3 @@ while (i < len) {
 let pad = __webpack_require__(0);
-const float = __webpack_require__(3);
+const float = __webpack_require__(4);
 const intBits = __webpack_require__(1);
@@ -1263,0 +1343,0 @@

index.js

@@ -115,2 +115,3 @@ /*!
      * Turn the file to RIFF.
+     * All values will be little-endian when writing.
      */
@@ -123,2 +124,3 @@ toRIFF() {
      * Turn the file to RIFX.
+     * All values but FourCCs will be big-endian when writing.
      */
@@ -130,2 +132,64 @@ toRIFX() {
     /**
+     * Change the bit depth of the data.
+     * @param {string} bitDepth The new bit depth of the data.
+     *      One of "8", "16", "24", "32", "32f", "64"
+     */
+    toBitDepth(bitDepth) {
+        if (bitDepth == this.bitDepth_) {
+            return;
+        }
+        let originalBitDepth = this.bitDepth_;
+        this.bitDepth_ = bitDepth;
+        try {
+            this.validateBitDepth_();
+        } catch(err) {
+            this.bitDepth_ = originalBitDepth;
+            throw err;
+        }
+        let len = this.samples_.length;
+        let newSamples = [];
+
+        // change the bit depth of the samples
+        let oldMaxValue =
+            parseInt((byteData.BitDepthMaxValues[parseInt(originalBitDepth, 10)]) / 2, 10);
+        let newMaxValue =
+            parseInt((byteData.BitDepthMaxValues[parseInt(this.bitDepth_, 10)] -1) / 2, 10);
+
+        for (let i=0; i<len;i++) {
+            if (originalBitDepth == "8") {
+                this.samples_[i] -= 128;
+            }
+            if (this.bitDepth_ == "32f" || this.bitDepth_ == "64") {
+                if (originalBitDepth == "32f" || originalBitDepth == "64") {
+                    newSamples.push(this.samples_[i]);
+                } else {
+                    newSamples.push(this.samples_[i] / oldMaxValue);
+                }
+            }else {
+                if (originalBitDepth == "32f" || originalBitDepth == "64" ) {
+                    newSamples.push(this.samples_[i] * newMaxValue);
+                } else {
+                    newSamples.push(
+                        parseInt((this.samples_[i] / oldMaxValue) * newMaxValue, 10)
+                    );
+                }
+                if (newSamples[i] < 0) {
+                    newSamples[i]--;
+                }
+                if (this.bitDepth_ == "8") {
+                    newSamples[i] += 128;
+                }
+            }  
+        }
+        // recreate the file with the new samples
+        this.fromScratch(
+            this.numChannels,
+            this.sampleRate,
+            this.bitDepth_,
+            newSamples,
+            {"container": this.chunkId}
+        );
+    }
+
+    /**
      * Interleave multi-channel samples.
@@ -311,7 +375,19 @@ */
     checkWriteInput_() {
+        this.validateBitDepth_();
+        this.validateNumChannels_();
+        this.validateSampleRate_();
+    }
+
+    /**
+     * Validate the bit depth.
+     * @param {number} numChannels The number of channels
+     * @param {string} bitDepth The audio bit depth.
+     *     Should be one of "8", "16", "24", "32", "32f", "64".
+     * @throws {Error} If any argument does not meet the criteria.
+     */
+    validateBitDepth_() {
         if (!this.headerFormats_[this.bitDepth_]) {
             throw new Error(this.WaveErrors.bitDepth);
         }
-        this.validateNumChannels_();
-        this.validateSampleRate_();
+        return true;
     }
@@ -318,0 +394,0 @@

package.json

 {
   "name": "wavefile",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "Read & write wave files with 8, 16, 24, 32 PCM, 32 IEEE & 64-bit data.",
@@ -57,5 +57,5 @@ "homepage": "https://github.com/rochars/wavefile",
   "dependencies": {
-    "byte-data": "^0.4.1"
+    "byte-data": "^0.4.2"
   },
   "main": "index.js"
 }

README.md

@@ -52,2 +52,24 @@ # wavefile
 
+## Change the bit depth
+```javascript
+let wav = new wavefile.Wavefile(fs.readFileSync("file.wav"));
+
+// Stereo samples must be interleaved with interleave()
+// before changing the bit depth.
+// Possible values are:
+//  "8", "16", "24", "32", "32f", "64"
+wav.toBitDepth("24");
+```
+
+## Interleave and de-interleave stereo samples
+```javascript
+let wav = new wavefile.Wavefile(fs.readFileSync("file.wav"));
+
+// Interleave stereo samples
+wav.interleave();
+
+// De-interleave the samples into multiple channels
+wav.deInterleave();
+```
+
 ## RIFF to RIFX and RIFX to RIFF
@@ -101,8 +123,2 @@ ```javascript
 
-## Interleave and de-interleave stereo samples
-```javascript
-wav.interleave();
-wav.deInterleave();
-```
-
 ## LICENSE
@@ -109,0 +125,0 @@ Copyright (c) 2017 Rafael da Silva Rocha.

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Improved metrics

Total package byte prevSize

1168443

increased by1.14%

Lines of code

2771

increased by5.68%

Number of lines in readme file

143

increased by12.6%

Dependency changes

• Updatedbyte-data@^0.4.2