audio-feeder - npm Package Compare versions

Comparing version 0.4.20 to 0.4.21

dist/AudioFeeder.min.js

@@ -1,1 +0,1 @@
-!function(a,b){"object"==typeof exports&&"object"==typeof module?module.exports=b():"function"==typeof define&&define.amd?define([],b):"object"==typeof exports?exports.AudioFeeder=b():a.AudioFeeder=b()}(this,function(){return function(a){function b(d){if(c[d])return c[d].exports;var e=c[d]={exports:{},id:d,loaded:!1};return a[d].call(e.exports,e,e.exports,b),e.loaded=!0,e.exports}var c={};return b.m=a,b.c=c,b.p="",b(0)}([function(a,b,c){!function(){function b(a){this._options=a||{},this._backend=null,this._resampleFractional=0,this._resampleLastSampleData=void 0}var d=(c(1),c(2)),e=c(4);b.prototype.rate=0,b.prototype.targetRate=0,b.prototype.channels=0,b.prototype.bufferSize=0,Object.defineProperty(b.prototype,"bufferDuration",{get:function(){return this.targetRate?this.bufferSize/this.targetRate:0}}),Object.defineProperty(b.prototype,"bufferThreshold",{get:function(){return this._backend?this._backend.bufferThreshold/this.targetRate:0},set:function(a){if(!this._backend)throw"Invalid state: AudioFeeder cannot set bufferThreshold before init";this._backend.bufferThreshold=Math.round(a*this.targetRate)}}),Object.defineProperty(b.prototype,"playbackPosition",{get:function(){if(this._backend){var a=this.getPlaybackState();return a.playbackPosition}return 0}}),Object.defineProperty(b.prototype,"durationBuffered",{get:function(){if(this._backend){var a=this.getPlaybackState();return a.samplesQueued/this.targetRate}return 0}}),Object.defineProperty(b.prototype,"muted",{get:function(){if(this._backend)return this._backend.muted;throw"Invalid state: cannot get mute before init"},set:function(a){if(!this._backend)throw"Invalid state: cannot set mute before init";this._backend.muted=a}}),b.prototype.mute=function(){this.muted=!0},b.prototype.unmute=function(){this.muted=!1},Object.defineProperty(b.prototype,"volume",{get:function(){if(this._backend)return this._backend.volume;throw"Invalid state: cannot get volume before init"},set:function(a){if(!this._backend)throw"Invalid state: cannot set volume before init";this._backend.volume=a}}),b.prototype.init=function(a,b){if(this.channels=a,this.rate=b,d.isSupported())this._backend=new d(a,b,this._options);else{if(!e.isSupported())throw"No supported backend";this._backend=new e(a,b,this._options)}this.targetRate=this._backend.rate,this.bufferSize=this._backend.bufferSize,this._backend.onstarved=function(){this.onstarved&&this.onstarved()}.bind(this),this._backend.onbufferlow=function(){this.onbufferlow&&this.onbufferlow()}.bind(this)},b.prototype._resample=function(a){var b=this.rate,c=this.channels,d=this._backend.rate,e=this._backend.channels;if(b==d&&c==e)return a;var f,g=[],h=a[0].length,i=this._resampleFractional,j=h*d/b+i,k=Math.trunc(j),l=j-k;f=b<d?function(a,c,e,f){for(var g=function(b){return b<0?e&&e.length+b>0?e[e.length+b]:a[0]:a[b]},h=0;h<c.length;h++){var j,k=(h+1-i)*b/d-1,l=Math.floor(k),m=Math.ceil(k);j=l==m?g(l):g(l)*(m-k)+g(m)*(k-l),c[h]=f*j}}:function(a,b,c,d){for(var e=0;e<b.length;e++)b[e]=d*a[e*a.length/b.length|0]};var m=1;e>c&&(m=Math.SQRT1_2);for(var n=0;n<e;n++){var o=n;n>=c&&(o=0);var p=a[o],q=new Float32Array(k),r=this._resampleLastSampleData?this._resampleLastSampleData[o]:void 0;f(p,q,r,m),g.push(q)}return this._resampleFractional=l,this._resampleLastSampleData=a,g},b.prototype.bufferData=function(a){if(!this._backend)throw"Invalid state: AudioFeeder cannot bufferData before init";var b=this._resample(a);this._backend.appendBuffer(b)},b.prototype.getPlaybackState=function(){if(this._backend)return this._backend.getPlaybackState();throw"Invalid state: AudioFeeder cannot getPlaybackState before init"},b.prototype.waitUntilReady=function(a){if(!this._backend)throw"Invalid state: AudioFeeder cannot waitUntilReady before init";this._backend.waitUntilReady(a)},b.prototype.start=function(){if(!this._backend)throw"Invalid state: AudioFeeder cannot start before init";this._backend.start()},b.prototype.stop=function(){if(!this._backend)throw"Invalid state: AudioFeeder cannot stop before init";this._backend.stop()},b.prototype.flush=function(){if(this._resampleFractional=0,this._resampleLastSampleData=void 0,!this._backend)throw"Invalid state: AudioFeeder cannot flush before init";this._backend.flush()},b.prototype.close=function(){this._backend&&(this._backend.close(),this._backend=null)},b.prototype.onstarved=null,b.prototype.onbufferlow=null,b.isSupported=function(){return!!Float32Array&&(d.isSupported()||e.isSupported())},b.initSharedAudioContext=function(){return d.isSupported()?d.initSharedAudioContext():null},a.exports=b}()},function(a,b){function c(a,b){if(a<1||a!==Math.round(a))throw"Invalid channel count for BufferQueue";this.channels=a,this.bufferSize=b,this.flush()}c.prototype.flush=function(){this._buffers=[],this._pendingBuffer=this.createBuffer(this.bufferSize),this._pendingPos=0},c.prototype.sampleCount=function(){var a=0;return this._buffers.forEach(function(b){a+=b[0].length}),a},c.prototype.createBuffer=function(a){for(var b=[],c=0;c<this.channels;c++)b[c]=new Float32Array(a);return b},c.prototype.validate=function(a){if(a.length!==this.channels)return!1;for(var b,c=0;c<a.length;c++){var d=a[c];if(!(d instanceof Float32Array))return!1;if(0==c)b=d.length;else if(d.length!==b)return!1}return!0},c.prototype.appendBuffer=function(a){if(!this.validate(a))throw"Invalid audio buffer passed to BufferQueue.appendBuffer";for(var b=a[0],c=b.length,d=this.channels,e=this._pendingPos,f=this._pendingBuffer,g=this.bufferSize,h=0;h<c;h++){for(var i=0;i<d;i++)f[i][e]=a[i][h];++e==g&&(this._buffers.push(f),e=this._pendingPos=0,f=this._pendingBuffer=this.createBuffer(g))}this._pendingPos=e},c.prototype.prependBuffer=function(a){if(!this.validate(a))throw"Invalid audio buffer passed to BufferQueue.prependBuffer";var b=this._buffers.slice(0);b.push(this.trimBuffer(this._pendingBuffer,0,this._pendingPos)),this.flush(),this.appendBuffer(a);for(var c=0;c<b.length;c++)this.appendBuffer(b[c])},c.prototype.nextBuffer=function(){if(this._buffers.length)return this._buffers.shift();var a=this.trimBuffer(this._pendingBuffer,0,this._pendingPos);return this._pendingBuffer=this.createBuffer(this.bufferSize),this._pendingPos=0,a},c.prototype.trimBuffer=function(a,b,c){var d=a[0].length,e=b+Math.min(c,d);if(0==b&&e>=d)return a;for(var f=[],g=0;g<this.channels;g++)f[g]=a[g].subarray(b,e);return f},a.exports=c},function(a,b,c){!function(){function b(a,c,d){var f=d.audioContext||b.initSharedAudioContext();if(this._context=f,this.output=d.output||f.destination,this.rate=f.sampleRate,this.channels=2,d.bufferSize&&(this.bufferSize=0|d.bufferSize),this.bufferThreshold=2*this.bufferSize,this._bufferQueue=new e(this.channels,this.bufferSize),this._playbackTimeAtBufferTail=f.currentTime,this._queuedTime=0,this._delayedTime=0,this._dropped=0,this._liveBuffer=this._bufferQueue.createBuffer(this.bufferSize),f.createScriptProcessor)this._node=f.createScriptProcessor(this.bufferSize,0,this.channels);else{if(!f.createJavaScriptNode)throw new Error("Bad version of web audio API?");this._node=f.createJavaScriptNode(this.bufferSize,0,this.channels)}}var d=window.AudioContext||window.webkitAudioContext,e=c(1),f=c(3);b.prototype.bufferSize=4096,b.prototype.bufferThreshold=8192,b.prototype._volume=1,Object.defineProperty(b.prototype,"volume",{get:function(){return this._volume},set:function(a){this._volume=+a}}),b.prototype._muted=!1,Object.defineProperty(b.prototype,"muted",{get:function(){return this._muted},set:function(a){this._muted=!!a}}),b.prototype._audioProcess=function(a){var b,c,d,e,g;g="number"==typeof a.playbackTime?a.playbackTime:this._context.currentTime+this.bufferSize/this.rate;var h=this._playbackTimeAtBufferTail;if(h<g&&(this._delayedTime+=g-h),this._bufferQueue.sampleCount()<this.bufferSize&&this.onstarved&&this.onstarved(),this._bufferQueue.sampleCount()<this.bufferSize){for(b=0;b<this.channels;b++)for(d=a.outputBuffer.getChannelData(b),e=0;e<this.bufferSize;e++)d[e]=0;return void this._dropped++}var i=this.muted?0:this.volume,j=this._bufferQueue.nextBuffer();if(j[0].length<this.bufferSize)throw"Audio buffer not expected length.";for(b=0;b<this.channels;b++)for(c=j[b],this._liveBuffer[b].set(j[b]),d=a.outputBuffer.getChannelData(b),e=0;e<c.length;e++)d[e]=c[e]*i;this._queuedTime+=this.bufferSize/this.rate,this._playbackTimeAtBufferTail=g+this.bufferSize/this.rate,this._bufferQueue.sampleCount()<Math.max(this.bufferSize,this.bufferThreshold)&&this.onbufferlow&&f(this.onbufferlow.bind(this))},b.prototype._samplesQueued=function(){var a=this._bufferQueue.sampleCount(),b=Math.floor(this._timeAwaitingPlayback()*this.rate);return a+b},b.prototype._timeAwaitingPlayback=function(){return Math.max(0,this._playbackTimeAtBufferTail-this._context.currentTime)},b.prototype.getPlaybackState=function(){return{playbackPosition:this._queuedTime-this._timeAwaitingPlayback(),samplesQueued:this._samplesQueued(),dropped:this._dropped,delayed:this._delayedTime}},b.prototype.waitUntilReady=function(a){a()},b.prototype.appendBuffer=function(a){this._bufferQueue.appendBuffer(a)},b.prototype.start=function(){this._node.onaudioprocess=this._audioProcess.bind(this),this._node.connect(this.output),this._playbackTimeAtBufferTail=this._context.currentTime},b.prototype.stop=function(){if(this._node){var a=this._timeAwaitingPlayback();if(a>0){var b=Math.round(a*this.rate),c=this._liveBuffer?this._liveBuffer[0].length:0;b>c?(this._bufferQueue.prependBuffer(this._liveBuffer),this._bufferQueue.prependBuffer(this._bufferQueue.createBuffer(b-c))):this._bufferQueue.prependBuffer(this._bufferQueue.trimBuffer(this._liveBuffer,c-b,b)),this._playbackTimeAtBufferTail-=a}this._node.onaudioprocess=null,this._node.disconnect()}},b.prototype.flush=function(){this._bufferQueue.flush()},b.prototype.close=function(){this.stop(),this._context=null},b.prototype.onstarved=null,b.prototype.onbufferlow=null,b.isSupported=function(){return!!d},b.sharedAudioContext=null,b.initSharedAudioContext=function(){if(!b.sharedAudioContext&&b.isSupported()){var a,c=new d;if(c.createScriptProcessor)a=c.createScriptProcessor(1024,0,2);else{if(!c.createJavaScriptNode)throw new Error("Bad version of web audio API?");a=c.createJavaScriptNode(1024,0,2)}a.connect(c.destination),a.disconnect(),b.sharedAudioContext=c}return b.sharedAudioContext},a.exports=b}()},function(a,b){a.exports=function(){if("undefined"!=typeof window.setImmediate)return window.setImmediate;if(window&&window.postMessage){var a=[];return window.addEventListener("message",function(b){if(b.source===window){var c=b.data;if("object"==typeof c&&c.nextTickBrowserPingMessage){var d=a.pop();d&&d()}}}),function(b){a.push(b),window.postMessage({nextTickBrowserPingMessage:!0},document.location.toString())}}return function(a){setTimeout(a,0)}}()},function(a,b,c){!function(){function b(a){for(var b=new Uint8Array(a),c=b.length,d="",e=0;e<c;e+=8)d+=h[b[e]],d+=h[b[e+1]],d+=h[b[e+2]],d+=h[b[e+3]],d+=h[b[e+4]],d+=h[b[e+5]],d+=h[b[e+6]],d+=h[b[e+7]];return d}function d(a){this.init(a)}var e=c(5),f=c(3),g=function(a,b,c){c=c||{};var g={};"string"==typeof c.base&&(g.swf=c.base+"/"+e),c.bufferSize&&(this.bufferSize=0|c.bufferSize),this._flashaudio=new d(g),this._flashBuffer="",this._cachedFlashState=null,this._cachedFlashTime=0,this._cachedFlashInterval=185,this._waitUntilReadyQueue=[],this.onready=function(){for(this._flashaudio.flashElement.setBufferSize(this.bufferSize),this._flashaudio.flashElement.setBufferThreshold(this.bufferThreshold);this._waitUntilReadyQueue.length;){var a=this._waitUntilReadyQueue.shift();a.apply(this)}},this.onlog=function(a){console.log("AudioFeeder FlashBackend: "+a)},this.bufferThreshold=2*this.bufferSize;var h={ready:"sync",log:"sync",starved:"sync",bufferlow:"async"};this._callbackName="AudioFeederFlashBackendCallback"+this._flashaudio.id;window[this._callbackName]=function(a){var b=h[a],c=this["on"+a];b&&c&&("async"===b?f(c.bind(this)):(c.apply(this,Array.prototype.slice.call(arguments,1)),this._flushFlashBuffer()))}.bind(this)};g.prototype.rate=44100,g.prototype.channels=2,g.prototype.bufferSize=4096,g.prototype._bufferThreshold=8192,Object.defineProperty(g.prototype,"bufferThreshold",{get:function(){return this._bufferThreshold},set:function(a){this._bufferThreshold=0|a,this.waitUntilReady(function(){this._flashaudio.flashElement.setBufferThreshold(this._bufferThreshold)}.bind(this))}}),g.prototype._volume=1,Object.defineProperty(g.prototype,"volume",{get:function(){return this._volume},set:function(a){this._volume=+a,this.waitUntilReady(this._flashVolumeUpdate.bind(this))}}),g.prototype._muted=!1,Object.defineProperty(g.prototype,"muted",{get:function(){return this._muted},set:function(a){this._muted=!!a,this.waitUntilReady(this._flashVolumeUpdate.bind(this))}}),g.prototype._paused=!0,g.prototype._flashVolumeUpdate=function(){this._flashaudio&&this._flashaudio.flashElement&&this._flashaudio.flashElement.setVolume&&this._flashaudio.flashElement.setVolume(this.muted?0:this.volume)},g.prototype._resampleFlash=function(a){for(var b=a[0].length,c=new Float32Array(2*b),d=a[0],e=this.channels>1?a[1]:d,f=0;f<b;f++){var g=f,h=2*f;c[h]=d[g],c[h+1]=e[g]}return c};for(var h=[],i=0;i<256;i++)h[i]=String.fromCharCode(i+57344);g.prototype._flushFlashBuffer=function(){var a=this._flashBuffer,b=this._flashaudio.flashElement;this._flashBuffer="",a.length>0&&(this._cachedFlashState=b.write(a),this._cachedFlashTime=Date.now())},g.prototype.appendBuffer=function(a){var c=this._resampleFlash(a);if(c.length>0){var d=b(c.buffer);this._flashBuffer+=d,this._flashBuffer.length>=8*this.bufferSize&&this._flushFlashBuffer()}},g.prototype.getPlaybackState=function(){if(this._flashaudio&&this._flashaudio.flashElement&&this._flashaudio.flashElement.write){var a,b=Date.now(),c=this._paused?0:b-this._cachedFlashTime;if(this._cachedFlashState&&c<this._cachedFlashInterval){var d=this._cachedFlashState;a={playbackPosition:d.playbackPosition+c/1e3,samplesQueued:d.samplesQueued-Math.max(0,Math.round(c*this.rate/1e3)),dropped:d.dropped,delayed:d.delayed}}else a=this._flashaudio.flashElement.getPlaybackState(),this._cachedFlashState=a,this._cachedFlashTime=b;return a.samplesQueued+=this._flashBuffer.length/8,a}return{playbackPosition:0,samplesQueued:0,dropped:0,delayed:0}},g.prototype.waitUntilReady=function(a){this._flashaudio&&this._flashaudio.flashElement.write?a.apply(this):this._waitUntilReadyQueue.push(a)},g.prototype.start=function(){this._flushFlashBuffer(),this._flashaudio.flashElement.start(),this._paused=!1,this._cachedFlashState=null},g.prototype.stop=function(){this._flashaudio.flashElement.stop(),this._paused=!0,this._cachedFlashState=null},g.prototype.flush=function(){this._flashBuffer="",this._flashaudio.flashElement.flush(),this._cachedFlashState=null},g.prototype.close=function(){this.stop();var a=this._flashaudio.flashWrapper;a.parentNode.removeChild(a),this._flashaudio=null,delete window[this._callbackName]},g.prototype.onstarved=null,g.prototype.onbufferlow=null,g.isSupported=function(){if(navigator.userAgent.indexOf("Trident")!==-1)try{new ActiveXObject("ShockwaveFlash.ShockwaveFlash");return!0}catch(a){return!1}return!1},d.nextId=1,d.prototype={nextId:null,swf:e,flashWrapper:null,flashElement:null,init:function(a){var b=this;b.id=d.nextId++,a&&"undefined"!=typeof a.swf&&(b.swf=a.swf),b.flashWrapper=document.createElement("div"),b.flashWrapper.id="dynamicaudio-flashwrapper-"+b.id;var c=b.flashWrapper.style;c.position="fixed",c.width="11px",c.height="11px",c.bottom=c.left="0px",c.overflow="hidden",b.flashElement=document.createElement("div"),b.flashElement.id="dynamicaudio-flashelement-"+b.id,b.flashWrapper.appendChild(b.flashElement),document.body.appendChild(b.flashWrapper);var e=b.flashElement.id,f='<param name="FlashVars" value="objectId='+b.id+'">';b.flashWrapper.innerHTML="<object id='"+e+"' width='10' height='10' type='application/x-shockwave-flash' data='"+b.swf+"' style='visibility: visible;'><param name='allowscriptaccess' value='always'>"+f+"</object>",b.flashElement=document.getElementById(e)}},a.exports=g}()},function(a,b,c){a.exports=c.p+"dynamicaudio.swf?version=2c1ce3bfb7e6fa65c26d726a00017a94"}])});
+!function(a,b){"object"==typeof exports&&"object"==typeof module?module.exports=b():"function"==typeof define&&define.amd?define([],b):"object"==typeof exports?exports.AudioFeeder=b():a.AudioFeeder=b()}(this,function(){return function(a){function b(d){if(c[d])return c[d].exports;var e=c[d]={exports:{},id:d,loaded:!1};return a[d].call(e.exports,e,e.exports,b),e.loaded=!0,e.exports}var c={};return b.m=a,b.c=c,b.p="",b(0)}([function(a,b,c){!function(){function b(a){this._options=a||{},this._backend=null,this._resampleFractional=0,this._resampleLastSampleData=void 0,this._tempoChanger=null}var d=(c(1),c(2)),e=c(4),f=c(6);b.prototype.rate=0,b.prototype.targetRate=0,b.prototype.channels=0,b.prototype.bufferSize=0,Object.defineProperty(b.prototype,"bufferDuration",{get:function(){return this.targetRate?this.bufferSize/this.targetRate:0}}),Object.defineProperty(b.prototype,"bufferThreshold",{get:function(){return this._backend?this._backend.bufferThreshold/this.targetRate:0},set:function(a){if(!this._backend)throw"Invalid state: AudioFeeder cannot set bufferThreshold before init";this._backend.bufferThreshold=Math.round(a*this.targetRate)}}),Object.defineProperty(b.prototype,"playbackPosition",{get:function(){if(this._backend){var a=this.getPlaybackState();return a.playbackPosition}return 0}}),Object.defineProperty(b.prototype,"outputPlaybackPosition",{get:function(){if(this._backend){var a=this.getPlaybackState();return a.outputPlaybackPosition}return 0}}),Object.defineProperty(b.prototype,"durationBuffered",{get:function(){if(this._backend){var a=this.getPlaybackState();return a.samplesQueued/this.targetRate}return 0}}),Object.defineProperty(b.prototype,"muted",{get:function(){if(this._backend)return this._backend.muted;throw"Invalid state: cannot get mute before init"},set:function(a){if(!this._backend)throw"Invalid state: cannot set mute before init";this._backend.muted=a}}),b.prototype.mute=function(){this.muted=!0},b.prototype.unmute=function(){this.muted=!1},Object.defineProperty(b.prototype,"volume",{get:function(){if(this._backend)return this._backend.volume;throw"Invalid state: cannot get volume before init"},set:function(a){if(!this._backend)throw"Invalid state: cannot set volume before init";this._backend.volume=a}}),Object.defineProperty(b.prototype,"tempo",{get:function(){if(this._tempoChanger)return this._tempoChanger.getTempo();throw"Invalid state: cannot get tempo before init"},set:function(a){if(!this._tempoChanger)throw"Invalid state: cannot set tempo before init";this._tempoChanger.setTempo(a)}}),b.prototype.init=function(a,b){if(this.channels=a,this.rate=b,d.isSupported())this._backend=new d(a,b,this._options);else{if(!e.isSupported())throw"No supported backend";this._backend=new e(a,b,this._options)}this.targetRate=this._backend.rate,this.bufferSize=this._backend.bufferSize,this._tempoChanger=f({sampleRate:this.targetRate,numChannels:a,tempo:1}),this._backend.onstarved=function(){this.onstarved&&this.onstarved()}.bind(this),this._backend.onbufferlow=function(){this.onbufferlow&&this.onbufferlow()}.bind(this)},b.prototype._resample=function(a){var b=this.rate,c=this.channels,d=this._backend.rate,e=this._backend.channels;if(b==d&&c==e)return a;var f,g=[],h=a[0].length,i=this._resampleFractional,j=h*d/b+i,k=Math.floor(j),l=j-k;f=b<d?function(a,c,e,f){for(var g=function(b){return b<0?e&&e.length+b>0?e[e.length+b]:a[0]:a[b]},h=0;h<c.length;h++){var j,k=(h+1-i)*b/d-1,l=Math.floor(k),m=Math.ceil(k);j=l==m?g(l):g(l)*(m-k)+g(m)*(k-l),c[h]=f*j}}:function(a,b,c,d){for(var e=0;e<b.length;e++)b[e]=d*a[e*a.length/b.length|0]};var m=1;e>c&&(m=Math.SQRT1_2);for(var n=0;n<e;n++){var o=n;n>=c&&(o=0);var p=a[o],q=new Float32Array(k),r=this._resampleLastSampleData?this._resampleLastSampleData[o]:void 0;f(p,q,r,m),g.push(q)}return this._resampleFractional=l,this._resampleLastSampleData=a,g},b.prototype.bufferData=function(a){if(!this._backend)throw"Invalid state: AudioFeeder cannot bufferData before init";var b=this._resample(a);b=this._tempoChanger.process(b),this._backend.appendBuffer(b)},b.prototype.getPlaybackState=function(){if(this._backend){var a=this._backend.getPlaybackState();return a.outputPlaybackPosition=a.playbackPosition,a.playbackPosition=this._tempoChanger.mapOutputToInputTime(a.outputPlaybackPosition),a}throw"Invalid state: AudioFeeder cannot getPlaybackState before init"},b.prototype.waitUntilReady=function(a){if(!this._backend)throw"Invalid state: AudioFeeder cannot waitUntilReady before init";this._backend.waitUntilReady(a)},b.prototype.start=function(){if(!this._backend)throw"Invalid state: AudioFeeder cannot start before init";this._backend.start()},b.prototype.stop=function(){if(!this._backend)throw"Invalid state: AudioFeeder cannot stop before init";this._backend.stop()},b.prototype.flush=function(){if(this._resampleFractional=0,this._resampleLastSampleData=void 0,!this._backend)throw"Invalid state: AudioFeeder cannot flush before init";this._tempoChanger.flush(this.durationBuffered),this._backend.flush()},b.prototype.close=function(){this._backend&&(this._backend.close(),this._backend=null)},b.prototype.onstarved=null,b.prototype.onbufferlow=null,b.isSupported=function(){return!!Float32Array&&(d.isSupported()||e.isSupported())},b.initSharedAudioContext=function(){return d.isSupported()?d.initSharedAudioContext():null},a.exports=b}()},function(a,b){function c(a,b){if(a<1||a!==Math.round(a))throw"Invalid channel count for BufferQueue";this.channels=a,this.bufferSize=b,this.flush()}c.prototype.flush=function(){this._buffers=[],this._pendingBuffer=this.createBuffer(this.bufferSize),this._pendingPos=0},c.prototype.sampleCount=function(){var a=0;return this._buffers.forEach(function(b){a+=b[0].length}),a},c.prototype.createBuffer=function(a){for(var b=[],c=0;c<this.channels;c++)b[c]=new Float32Array(a);return b},c.prototype.validate=function(a){if(a.length!==this.channels)return!1;for(var b,c=0;c<a.length;c++){var d=a[c];if(!(d instanceof Float32Array))return!1;if(0==c)b=d.length;else if(d.length!==b)return!1}return!0},c.prototype.appendBuffer=function(a){if(!this.validate(a))throw"Invalid audio buffer passed to BufferQueue.appendBuffer";for(var b=a[0],c=b.length,d=this.channels,e=this._pendingPos,f=this._pendingBuffer,g=this.bufferSize,h=0;h<c;h++){for(var 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f=e,g=0,h=0;h<a;h++)g<<=1,g|=1&f,f>>=1;c.m_revTgt[e]=g}c.twiddleRe=d.float_array(c.m_logN),c.twiddleIm=d.float_array(c.m_logN);for(var i=1,j=0;j<c.m_logN;j++){var k=2*i*Math.PI*c.m_invN;c.twiddleRe[j]=Math.cos(k),c.twiddleIm[j]=Math.sin(k),i<<=1}c.inplace=function(a){var b=c.m_re,d=c.m_im,e=c.m_N,f=c.m_logN,g=e>>1,h=e>>1,i=e;if(a)for(var j=1/e,k=0;k<e;k++)b[k]*=j,d[k]*=j;for(var l=0;l<f;l++){var m=c.twiddleRe[l],n=c.twiddleIm[l];a||(n*=-1);for(var o=0;o<e;){for(var p=o,q=o+h,r=1,s=0,t=0;t<g;t++){var u=b[p],v=d[p],w=b[q],x=d[q];b[p]=u+w,d[p]=v+x,w=u-w,x=v-x,b[q]=w*r-x*s,d[q]=w*s+x*r,p++,q++;var y=r;r=r*m-s*n,s=y*n+s*m}o+=i}g>>=1,h>>=1,i>>=1}for(var z,A,B=c.m_revTgt,C=0;C<e;C++)B[C]>C&&(z=B[C],A=b[z],b[z]=b[C],b[C]=A,A=d[z],d[z]=d[C],d[C]=A)};var l=b>>1;return c.unpack=function(a,d,e,f){a[0]=c.m_re[0],e[0]=c.m_im[0],d[0]=f[0]=0,a[l]=c.m_re[l],e[l]=c.m_im[l],d[l]=f[l]=0;for(var g=1;g<l;g++)a[g]=(c.m_re[g]+c.m_re[b-g])/2,d[g]=(c.m_im[g]-c.m_im[b-g])/2,e[g]=(c.m_im[g]+c.m_im[b-g])/2,f[g]=(-c.m_re[g]+c.m_re[b-g])/2},c.repack=function(a,d,e,f){c.m_re[0]=a[0],c.m_im[0]=e[0],c.m_re[l]=a[l],c.m_im[l]=e[l];for(var g=1;g<l;g++)c.m_re[g]=a[g]-f[g],c.m_im[g]=d[g]+e[g],c.m_re[b-g]=a[g]+f[g],c.m_im[b-g]=-d[g]+e[g]},c};a.exports=e}])})}])});

dist/demo.js

@@ -61,12 +61,8 @@ var demo =
 	    sampleCounter = 0,
-	    feeder = new AudioFeeder();
+	    feeder = new AudioFeeder(),
+	    initialized = false;
 
-	  start.disabled = true;
-	  feeder.init(channels, rate);
-	  feeder.waitUntilReady(function() {
-	    start.disabled = false;
-	  });
-
 	  function bufferSineWave(time) {
 	    var freq = 261, // middle C
+	      shellFreq = 0.5, // fade in/out over 2 seconds
 	      chunkSamples = Math.round(time * rate), // buffer 1s at a time
@@ -78,3 +74,4 @@ samples = Math.ceil(chunkSamples / freq) * freq,
 	    for (var i = 0; i < samples; i++) {
-	      buffer[i] = Math.sin((sampleCounter / rate) * freq * 2 * Math.PI);
+	      buffer[i] = Math.sin((sampleCounter / rate) * freq * 2 * Math.PI)
+	        * Math.sin((sampleCounter / rate) * shellFreq * 2 * Math.PI);
 	      sampleCounter++;
@@ -90,4 +87,14 @@ }
 
-	    bufferSineWave(1); // pre-buffer 1s
-	    feeder.start();
+	    var startFn = function() {
+	      feeder.tempo = document.querySelector('#tempo').value / 100;
+	      bufferSineWave(1); // pre-buffer 1s
+	      feeder.start();
+	    };
+
+	    if (!initialized) {
+	      feeder.init(channels, rate);
+	      feeder.waitUntilReady(startFn);
+	      initialized = true;
+	    } else startFn();
+
 	  });
@@ -103,3 +110,3 @@
 	    console.log('buffer low');
-	    while (feeder.durationBuffered < feeder.bufferThreshold * 2) {
+	    while (feeder.durationBuffered * feeder.tempo < feeder.bufferThreshold * 2) {
 	      bufferSineWave(1);
@@ -126,2 +133,7 @@ }
 
+	  var tempo = document.querySelector('#tempo');
+	  tempo.addEventListener('change', function() {
+	    feeder.tempo = this.value / 100;
+	  });
+
 	  start.disabled = false;
@@ -128,0 +140,0 @@ };

package.json

 {
   "name": "audio-feeder",
-  "version": "0.4.20",
+  "version": "0.4.21",
   "description": "Abstraction for streaming raw PCM audio in browser via Web Audio API.",
@@ -32,2 +32,3 @@ "main": "dist/AudioFeeder.js",
   "devDependencies": {
+    "audio-tempo-changer.js": "^0.2.0",
     "eslint": "^5.13.0",
@@ -40,2 +41,3 @@ "file-loader": "^0.8.5",
     "webpack": "^1.12.2",
+    "webpack-cli": "^3.3.2",
     "webpack-dev-server": "^3.1.14"
@@ -42,0 +44,0 @@ },

readme.md

@@ -17,2 +17,4 @@ audio-feeder
 ## Updates
+* 0.4.21 - 2019-05-28
+    * Included audio-tempo-changer to allow changing tempo of audio via .tempo attribute
 * 0.4.20 - 2019-05-17
@@ -19,0 +21,0 @@ * Fix for running Flash path when embedded into strict mode

src/demo.js

@@ -14,12 +14,8 @@ module.exports = function demo() {
     sampleCounter = 0,
-    feeder = new AudioFeeder();
+    feeder = new AudioFeeder(),
+    initialized = false;
 
-  start.disabled = true;
-  feeder.init(channels, rate);
-  feeder.waitUntilReady(function() {
-    start.disabled = false;
-  });
-
   function bufferSineWave(time) {
     var freq = 261, // middle C
+      shellFreq = 0.5, // fade in/out over 2 seconds
       chunkSamples = Math.round(time * rate), // buffer 1s at a time
@@ -31,3 +27,4 @@ samples = Math.ceil(chunkSamples / freq) * freq,
     for (var i = 0; i < samples; i++) {
-      buffer[i] = Math.sin((sampleCounter / rate) * freq * 2 * Math.PI);
+      buffer[i] = Math.sin((sampleCounter / rate) * freq * 2 * Math.PI)
+        * Math.sin((sampleCounter / rate) * shellFreq * 2 * Math.PI);
       sampleCounter++;
@@ -43,4 +40,14 @@ }
 
-    bufferSineWave(1); // pre-buffer 1s
-    feeder.start();
+    var startFn = function() {
+      feeder.tempo = document.querySelector('#tempo').value / 100;
+      bufferSineWave(1); // pre-buffer 1s
+      feeder.start();
+    };
+
+    if (!initialized) {
+      feeder.init(channels, rate);
+      feeder.waitUntilReady(startFn);
+      initialized = true;
+    } else startFn();
+
   });
@@ -56,3 +63,3 @@
     console.log('buffer low');
-    while (feeder.durationBuffered < feeder.bufferThreshold * 2) {
+    while (feeder.durationBuffered * feeder.tempo < feeder.bufferThreshold * 2) {
       bufferSineWave(1);
@@ -79,3 +86,8 @@ }
 
+  var tempo = document.querySelector('#tempo');
+  tempo.addEventListener('change', function() {
+    feeder.tempo = this.value / 100;
+  });
+
   start.disabled = false;
 };

src/index.js

@@ -5,3 +5,4 @@ (function() {
 		WebAudioBackend = require('./web-audio-backend.js'),
-		FlashBackend = require('./flash-backend.js');
+		FlashBackend = require('./flash-backend.js'),
+		AudioTempoChanger = require('audio-tempo-changer.js');
 
@@ -38,3 +39,4 @@
 	 * @typedef {Object} PlaybackState
-	 * @property {number} playbackPosition - total seconds so far of audio data that have played
+	 * @property {number} playbackPosition - total seconds so far of input audio data that have played (pre tempo change)
+	 * @property {number} outputPlaybackPosition - total seconds so far of audio that has been played (post tempo change)
 	 * @property {number} samplesQueued - number of samples at target rate that are queued up for playback
@@ -60,2 +62,3 @@ * @property {number} dropped - number of underrun events, when we had to play silence due to data starvation
 		this._resampleLastSampleData = undefined;
+		this._tempoChanger = null; // Initialized at init
 	};
@@ -151,4 +154,5 @@
 
+
 	/**
-	 * Current playback position, in seconds.
+	 * Current playback position, in seconds, in input time (i.e. pre tempo change)
 	 * This compensates for drops and underruns, and is suitable for a/v sync.
@@ -171,2 +175,20 @@ *
 	/**
+	 * Current playback position, in seconds, in output time (i.e. post tempo change)
+	 * Also compensates for drops and underruns, and is suitable for a/v sync.
+	 *
+	 * @type {number}
+	 * @readonly
+	 */
+	Object.defineProperty(AudioFeeder.prototype, 'outputPlaybackPosition', {
+		get: function getOutputPlaybackPosition() {
+			if (this._backend) {
+				var playbackState = this.getPlaybackState();
+				return playbackState.outputPlaybackPosition;
+			} else {
+				return 0;
+			}
+		}
+	});
+
+	/**
 	 * Duration of remaining queued data, in seconds.
@@ -247,2 +269,25 @@ *
 	/**
+	 * Tempo multiplier, defaults to 1.0.
+	 * @name volume
+	 * @type {number}
+	 */
+	Object.defineProperty(AudioFeeder.prototype, 'tempo', {
+		get: function getTempo() {
+			if (this._tempoChanger) {
+				return this._tempoChanger.getTempo();
+			} else {
+				throw 'Invalid state: cannot get tempo before init';
+			}
+		},
+		set: function setTempo(val) {
+			if (this._tempoChanger) {
+				this._tempoChanger.setTempo(val);
+			} else {
+				throw 'Invalid state: cannot set tempo before init';
+			}
+		}
+	});
+
+
+	/**
 	 * Start setting up for output with the given channel count and sample rate.
@@ -272,2 +317,5 @@ * Audio data you provide will be resampled if necessary to whatever the
 
+		// Initialize tempo changer (NB! no "new")
+		this._tempoChanger = AudioTempoChanger({ sampleRate: this.targetRate, numChannels: numChannels, tempo: 1.0 });
+
 		// Pass through the starved event
@@ -314,3 +362,3 @@ this._backend.onstarved = (function() {
 				outputLen = inputLen * targetRate / rate + previousFractional,
-				outputSamples = Math.trunc(outputLen),
+				outputSamples = Math.floor(outputLen),
 				remainingFractional = (outputLen - outputSamples);
@@ -404,2 +452,9 @@
 			var samples = this._resample(sampleData);
+
+			// NB! it is important all samples go through tempoChanger
+			//  it is built to switch to just copying if tempo = 1.0
+			//  but it still needs the samples to transition smoothly
+			//  and keep an accurate time map
+			samples = this._tempoChanger.process(samples);
+
 			this._backend.appendBuffer(samples);
@@ -418,3 +473,6 @@ } else {
 		if (this._backend) {
-			return this._backend.getPlaybackState();
+			var state = this._backend.getPlaybackState();
+			state.outputPlaybackPosition = state.playbackPosition; // as _backend works only in output time
+			state.playbackPosition = this._tempoChanger.mapOutputToInputTime(state.outputPlaybackPosition);
+			return state;
 		} else {
@@ -478,2 +536,3 @@ throw 'Invalid state: AudioFeeder cannot getPlaybackState before init';
 		if (this._backend) {
+			this._tempoChanger.flush(this.durationBuffered);
 			this._backend.flush();
@@ -480,0 +539,0 @@ } else {

No alert changes

Improved metrics

Total package byte prevSize

207261

increased by23.57%

Lines of code

4053

increased by23.79%

Number of lines in readme file

345

increased by0.58%

Worsened metrics

Dev dependency count

10

increased by25%

No dependency changes