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fileLength=dataView.byteLength;if(fileLength<20)throw new Error("WAV file is too short.");if(getString(dataView,0,4)!="RIFF")throw new Error("Not a valid WAV file (no RIFF header).");let mainChunkLength=dataView.getUint32(4,!0);if(8+mainChunkLength!=fileLength)throw new Error(`Main chunk length of WAV file (${8+mainChunkLength}) does not match file size (${fileLength}).`);if(getString(dataView,8,4)!="WAVE")throw new Error("RIFF file is not a WAV file.");let chunks=new Map,fileOffset=12;for(;fileOffset<fileLength;){if(fileOffset+8>fileLength)throw new Error(`Incomplete chunk prefix in WAV file at offset ${fileOffset}.`);let chunkId=getString(dataView,fileOffset,4).trim(),chunkLength=dataView.getUint32(fileOffset+4,!0);if(fileOffset+8+chunkLength>fileLength)throw new Error(`Incomplete chunk data in WAV file at offset ${fileOffset}.`);let chunkData=new DataView(dataView.buffer,dataView.byteOffset+fileOffset+8,chunkLength);chunks.set(chunkId,chunkData);let padLength=chunkLength%2;fileOffset+=8+chunkLength+padLength}return chunks}function getString(dataView,offset,length){let a=new Uint8Array(dataView.buffer,dataView.byteOffset+offset,length);return String.fromCharCode.apply(null,a)}function getInt24(dataView,offset){let b0=dataView.getInt8(offset+2)*65536,b12=dataView.getUint16(offset,!0);return b0+b12}function decodeFormatChunk(dataView){if(!dataView)throw new Error("No format chunk found in WAV file.");if(dataView.byteLength<16)throw new Error("Format chunk of WAV file is too short.");let fmt={};return fmt.formatCode=dataView.getUint16(0,!0),fmt.numberOfChannels=dataView.getUint16(2,!0),fmt.sampleRate=dataView.getUint32(4,!0),fmt.bytesPerSec=dataView.getUint32(8,!0),fmt.bytesPerFrame=dataView.getUint16(12,!0),fmt.bitsPerSample=dataView.getUint16(14,!0),fmt}function getWavFileType(fmt){if(fmt.numberOfChannels<1||fmt.numberOfChannels>999)throw new Error("Invalid number of channels in WAV file.");let bytesPerSample=Math.ceil(fmt.bitsPerSample/8),expectedBytesPerFrame=fmt.numberOfChannels*bytesPerSample;if(fmt.formatCode==1&&fmt.bitsPerSample>=1&&fmt.bitsPerSample<=8&&fmt.bytesPerFrame==expectedBytesPerFrame)return 0;if(fmt.formatCode==1&&fmt.bitsPerSample>=9&&fmt.bitsPerSample<=16&&fmt.bytesPerFrame==expectedBytesPerFrame)return 1;if(fmt.formatCode==1&&fmt.bitsPerSample>=17&&fmt.bitsPerSample<=24&&fmt.bytesPerFrame==expectedBytesPerFrame)return 2;if(fmt.formatCode==3&&fmt.bitsPerSample==32&&fmt.bytesPerFrame==expectedBytesPerFrame)return 3;throw new Error(`Unsupported WAV file type, formatCode=${fmt.formatCode}, bitsPerSample=${fmt.bitsPerSample}, bytesPerFrame=${fmt.bytesPerFrame}, numberOfChannels=${fmt.numberOfChannels}.`)}function decodeDataChunk(data,fmt,wavFileType){switch(wavFileType){case 0:return decodeDataChunk_uint8(data,fmt);case 1:return decodeDataChunk_int16(data,fmt);case 2:return decodeDataChunk_int24(data,fmt);case 3:return decodeDataChunk_float32(data,fmt);default:throw new Error("No decoder.")}}function decodeDataChunk_int16(data,fmt){let channelData=allocateChannelDataArrays(data.byteLength,fmt),numberOfChannels=fmt.numberOfChannels,numberOfFrames=channelData[0].length,offs=0;for(let frameNo=0;frameNo<numberOfFrames;frameNo++)for(let channelNo=0;channelNo<numberOfChannels;channelNo++){let sampleValueFloat=data.getInt16(offs,!0)/32768;channelData[channelNo][frameNo]=sampleValueFloat,offs+=2}return channelData}function decodeDataChunk_uint8(data,fmt){let channelData=allocateChannelDataArrays(data.byteLength,fmt),numberOfChannels=fmt.numberOfChannels,numberOfFrames=channelData[0].length,offs=0;for(let frameNo=0;frameNo<numberOfFrames;frameNo++)for(let channelNo=0;channelNo<numberOfChannels;channelNo++){let sampleValueFloat=(data.getUint8(offs)-128)/128;channelData[channelNo][frameNo]=sampleValueFloat,offs+=1}return channelData}function decodeDataChunk_int24(data,fmt){let channelData=allocateChannelDataArrays(data.byteLength,fmt),numberOfChannels=fmt.numberOfChannels,numberOfFrames=channelData[0].length,offs=0;for(let frameNo=0;frameNo<numberOfFrames;frameNo++)for(let channelNo=0;channelNo<numberOfChannels;channelNo++){let sampleValueFloat=getInt24(data,offs)/8388608;channelData[channelNo][frameNo]=sampleValueFloat,offs+=3}return channelData}function decodeDataChunk_float32(data,fmt){let channelData=allocateChannelDataArrays(data.byteLength,fmt),numberOfChannels=fmt.numberOfChannels,numberOfFrames=channelData[0].length,offs=0;for(let frameNo=0;frameNo<numberOfFrames;frameNo++)for(let channelNo=0;channelNo<numberOfChannels;channelNo++){let sampleValueFloat=data.getFloat32(offs,!0);channelData[channelNo][frameNo]=sampleValueFloat,offs+=4}return channelData}function allocateChannelDataArrays(dataLength,fmt){let numberOfFrames=Math.floor(dataLength/fmt.bytesPerFrame),channelData=new Array(fmt.numberOfChannels);for(let channelNo=0;channelNo<fmt.numberOfChannels;channelNo++)channelData[channelNo]=new Float32Array(numberOfFrames);return channelData}function verifyDataChunkLength(data,fmt){if(!data)throw new Error("No data chunk found in WAV file.");if(data.byteLength%fmt.bytesPerFrame!=0)throw new Error("WAV file data chunk length is not a multiple of frame size.")}function getWavFileInfo(fileData){let chunks=unpackWavFileChunks(fileData),chunkInfo=getChunkInfo(chunks),fmt=decodeFormatChunk(chunks.get("fmt"));return{chunkInfo,fmt}}function getChunkInfo(chunks){let chunkInfo=[];for(let e of chunks){let ci={};ci.chunkId=e[0],ci.dataOffset=e[1].byteOffset,ci.dataLength=e[1].byteLength,chunkInfo.push(ci)}return chunkInfo.sort((e1,e2)=>e1.dataOffset-e2.dataOffset),chunkInfo}function ensureMonoPcm(channelData){let{length:numberOfChannels}=channelData;if(numberOfChannels===1)return channelData[0];let monoData=new Float32Array(channelData[0].length);for(let i=0;i<monoData.length;i++){let sum=0;for(let j=0;j<numberOfChannels;j++)sum+=channelData[j][i];monoData[i]=sum/numberOfChannels}return monoData}function ensureS16lePcm(input){let int16Array=new Int16Array(input.length);for(let offset=0;offset<input.length;offset++){let x=~~(input[offset]*32768);int16Array[offset]=x>32767?32767:x}return int16Array.buffer}function toUTF8String(input,start=0,end=input.byteLength){return new TextDecoder().decode(input.slice(start,end))}function binaryFromSource(source){return ArrayBuffer.isView(source)?source.buffer.slice(source.byteOffset,source.byteOffset+source.byteLength):source}async function encode(input,sampleRate){let instance=await silk_default(),buffer=binaryFromSource(input);if(!buffer?.byteLength)throw new Error("input data length is 0");if(isWavFile(input)){let{channelData,sampleRate:wavSampleRate}=decodeWavFile(input);sampleRate||=wavSampleRate,buffer=ensureS16lePcm(ensureMonoPcm(channelData))}let data=new Uint8Array,duration=instance.silk_encode(buffer,sampleRate,output=>{data=output.slice()});if(duration===0)throw new Error("silk encoding failure");return{data,duration}}async function decode(input,sampleRate){let instance=await silk_default(),buffer=binaryFromSource(input);if(!buffer?.byteLength)throw new Error("input data length is 0");let data=new Uint8Array,duration=instance.silk_decode(buffer,sampleRate,output=>{output.length>0&&(data=output.slice())});if(duration===0)throw new Error("silk decoding failure");return{data,duration}}function getDuration(data,frameMs=20){let buffer=binaryFromSource(data),view=new DataView(buffer),byteLength=view.byteLength,offset=view.getUint8(0)===2?10:9,blocks=0;for(;offset<byteLength;){let size=view.getUint16(offset,!0);blocks+=1,offset+=size+2}return blocks*frameMs}function isWav(data){return isWavFile(data)}function getWavFileInfo2(data){return getWavFileInfo(data)}function isSilk(data){let buffer=binaryFromSource(data);return buffer.byteLength<7?!1:toUTF8String(buffer,0,7).includes("#!SILK")}0&&(module.exports={decode,encode,getDuration,getWavFileInfo,isSilk,isWav});