dataV-xunfei/processor.worklet.js

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u(t,e){(null==e||e>t.length)&&(e=t.length);for(var r=0,n=new Array(e);r<e;r++)n[r]=t[r];return n}function l(t,e,r,n){this.fromSampleRate=t,this.toSampleRate=e,this.channels=0|r,this.noReturn=!!n,this.initialize()}l.prototype.initialize=function(){if(!(this.fromSampleRate>0&&this.toSampleRate>0&&this.channels>0))throw new Error("Invalid settings specified for the resampler.");this.fromSampleRate==this.toSampleRate?(this.resampler=this.bypassResampler,this.ratioWeight=1):(this.fromSampleRate<this.toSampleRate?(this.lastWeight=1,this.resampler=this.compileLinearInterpolation):(this.tailExists=!1,this.lastWeight=0,this.resampler=this.compileMultiTap),this.ratioWeight=this.fromSampleRate/this.toSampleRate)},l.prototype.compileLinearInterpolation=function(t){var e=t.length;this.initializeBuffers(e);var r,n,i=this.outputBufferSize,o=this.ratioWeight,a=this.lastWeight,s=0,f=0,u=0,l=this.outputBuffer;if(e%this.channels==0){if(e>0){for(;a<1;a+=o)for(s=1-(f=a%1),r=0;r<this.channels;++r)l[u++]=this.lastOutput[r]*s+t[r]*f;for(a--,e-=this.channels,n=Math.floor(a)*this.channels;u<i&&n<e;){for(s=1-(f=a%1),r=0;r<this.channels;++r)l[u++]=t[n+r]*s+t[n+this.channels+r]*f;a+=o,n=Math.floor(a)*this.channels}for(r=0;r<this.channels;++r)this.lastOutput[r]=t[n++];return this.lastWeight=a%1,this.bufferSlice(u)}return this.noReturn?0:[]}throw new Error("Buffer was of incorrect sample length.")},l.prototype.compileMultiTap=function(t){var e=[],r=t.length;this.initializeBuffers(r);var n=this.outputBufferSize;if(r%this.channels==0){if(r>0){for(var i=this.ratioWeight,o=0,a=0;a<this.channels;++a)e[a]=0;var s=0,f=0,u=!this.tailExists;this.tailExists=!1;var l=this.outputBuffer,h=0,c=0;do{if(u)for(o=i,a=0;a<this.channels;++a)e[a]=0;else{for(o=this.lastWeight,a=0;a<this.channels;++a)e[a]+=this.lastOutput[a];u=!0}for(;o>0&&s<r;){if(!(o>=(f=1+s-c))){for(a=0;a<this.channels;++a)e[a]+=t[s+a]*o;c+=o,o=0;break}for(a=0;a<this.channels;++a)e[a]+=t[s++]*f;c=s,o-=f}if(0!=o){for(this.lastWeight=o,a=0;a<this.channels;++a)this.lastOutput[a]=e[a];this.tailExists=!0;break}for(a=0;a<this.channels;++a)l[h++]=e[a]/i}while(s<r&&h<n);return this.bufferSlice(h)}return this.noReturn?0:[]}throw new Error("Buffer was of incorrect sample length.")},l.prototype.bypassResampler=function(t){return this.noReturn?(this.outputBuffer=t,t.length):t},l.prototype.bufferSlice=function(t){if(this.noReturn)return t;try{return this.outputBuffer.subarray(0,t)}catch(e){try{return this.outputBuffer.length=t,this.outputBuffer}catch(e){return this.outputBuffer.slice(0,t)}}},l.prototype.initializeBuffers=function(t){this.outputBufferSize=Math.ceil(t*this.toSampleRate/this.fromSampleRate);try{this.outputBuffer=new Float32Array(this.outputBufferSize),this.lastOutput=new Float32Array(this.channels)}catch(t){this.outputBuffer=[],this.lastOutput=[]}};var h=function(e){!function(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function");t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,writable:!0,configurable:!0}}),Object.defineProperty(t,"prototype",{writable:!1}),e&&r(t,e)}(h,e);var n,i,o,u=s(h);function h(){var t;!function(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}(this,h);var e=a(t=u.call(this));return t.port.onmessage=function(t){var r=t.data,n=r.type,i=r.data;if(console.log("type",n),"init"===n){var o=i.frameSize,a=i.toSampleRate,s=i.arrayBufferType,f=i.fromSampleRate;return e.frameSize=o*Math.floor(f/a),e.resampler=new l(f,a,1),e.frameBuffer=[],void(e.arrayBufferType=s)}"stop"===n&&(e.port.postMessage({frameBuffer:e.transData(e.frameBuffer),isLastFrame:!0}),e.frameBuffer=[])},t}return n=h,(i=[{key:"process",value:function(t){var e,r=t[0][0];return this.frameSize?((e=this.frameBuffer).push.apply(e,f(r)),this.frameBuffer.length>=this.frameSize&&(this.port.postMessage({frameBuffer:this.transData(this.frameBuffer),isLastFrame:!1}),this.frameBuffer=[]),!0):(r&&this.port.postMessage({frameBuffer:this.transData(r),isLastFrame:!1}),!0)}},{key:"transData",value:function(t){return"short16"===this.arrayBufferType&&(t=function(t){for(var e=new ArrayBuffer(2*t.length),r=new DataView(e),n=0,i=0;i<t.length;i+=1,n+=2){var o=Math.max(-1,Math.min(1,t[i]));r.setInt16(n,o<0?32768*o:32767*o,!0)}return r.buffer}(t=this.resampler.resampler(t))),t}}])&&t(n.prototype,i),o&&t(n,o),Object.defineProperty(n,"prototype",{writable:!1}),h}(o(AudioWorkletProcessor));registerProcessor("processor-worklet",h)}();