@dmk-dark/opus-media-recorder-fork/OggOpusEncoder.js

MedialRecorer polyfill for Opus recording using WebAssembly

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var Module=typeof Module!=="undefined"?Module:{};const{EmscriptenMemoryAllocator:EmscriptenMemoryAllocator}=require("./commonFunctions.js");const OPUS_APPLICATION=2049;const OPUS_OUTPUT_SAMPLE_RATE=48e3;const OPUS_OUTPUT_MAX_LENGTH=4e3;const OPUS_FRAME_SIZE=20;const SPEEX_RESAMPLE_QUALITY=6;const BUFFER_LENGTH=4096;const OPUS_OK=0;const OPUS_SET_BITRATE_REQUEST=4002;const RESAMPLER_ERR_SUCCESS=0;class _OpusEncoder{constructor(inputSampleRate,channelCount,bitsPerSecond=undefined){this.config={inputSampleRate:inputSampleRate,channelCount:channelCount};this.memory=new EmscriptenMemoryAllocator(Module);this._opus_encoder_create=Module._opus_encoder_create;this._opus_encoder_ctl=Module._opus_encoder_ctl;this._opus_encode_float=Module._opus_encode_float;this._opus_encoder_destroy=Module._opus_encoder_destroy;this._speex_resampler_init=Module._speex_resampler_init;this._speex_resampler_process_interleaved_float=Module._speex_resampler_process_interleaved_float;this._speex_resampler_destroy=Module._speex_resampler_destroy;this._container=new Module.Container;this._container.init(OPUS_OUTPUT_SAMPLE_RATE,channelCount,Math.floor(Math.random()*4294967295));this.OpusInitCodec(OPUS_OUTPUT_SAMPLE_RATE,channelCount,bitsPerSecond);this.SpeexInitResampler(inputSampleRate,OPUS_OUTPUT_SAMPLE_RATE,channelCount);this.inputSamplesPerChannel=inputSampleRate*OPUS_FRAME_SIZE/1e3;this.outputSamplePerChannel=OPUS_OUTPUT_SAMPLE_RATE*OPUS_FRAME_SIZE/1e3;this.inputBufferIndex=0;this.mInputBuffer=this.memory.mallocFloat32Buffer(this.inputSamplesPerChannel*channelCount);this.mResampledBuffer=this.memory.mallocFloat32Buffer(this.outputSamplePerChannel*channelCount);this.mOutputBuffer=this.memory.mallocUint8Buffer(OPUS_OUTPUT_MAX_LENGTH);this.interleavedBuffers=channelCount!==1?new Float32Array(BUFFER_LENGTH*channelCount):undefined}encode(buffers){let samples=this.interleave(buffers);let sampleIndex=0;while(sampleIndex<samples.length){let lengthToCopy=Math.min(this.mInputBuffer.length-this.inputBufferIndex,samples.length-sampleIndex);this.mInputBuffer.set(samples.subarray(sampleIndex,sampleIndex+lengthToCopy),this.inputBufferIndex);this.inputBufferIndex+=lengthToCopy;if(this.inputBufferIndex>=this.mInputBuffer.length){let mInputLength=this.memory.mallocUint32(this.inputSamplesPerChannel);let mOutputLength=this.memory.mallocUint32(this.outputSamplePerChannel);let err=this._speex_resampler_process_interleaved_float(this.resampler,this.mInputBuffer.pointer,mInputLength.pointer,this.mResampledBuffer.pointer,mOutputLength.pointer);mInputLength.free();mOutputLength.free();if(err!==RESAMPLER_ERR_SUCCESS){throw new Error("Resampling error.")}let packetLength=this._opus_encode_float(this.encoder,this.mResampledBuffer.pointer,this.outputSamplePerChannel,this.mOutputBuffer.pointer,this.mOutputBuffer.length);if(packetLength<0){throw new Error("Opus encoding error.")}this._container.writeFrame(this.mOutputBuffer.pointer,packetLength,this.outputSamplePerChannel);this.inputBufferIndex=0}sampleIndex+=lengthToCopy}}close(){const{channelCount:channelCount}=this.config;let finalFrameBuffers=[];for(let i=0;i<channelCount;++i){finalFrameBuffers.push(new Float32Array(BUFFER_LENGTH-this.inputBufferIndex/channelCount))}this.encode(finalFrameBuffers);Module.destroy(this._container);this.mInputBuffer.free();this.mResampledBuffer.free();this.mOutputBuffer.free();this._opus_encoder_destroy(this.encoder);this._speex_resampler_destroy(this.resampler)}interleave(channelBuffers){const chCount=channelBuffers.length;if(chCount===1){return channelBuffers[0]}for(let ch=0;ch<chCount;ch++){let buffer=channelBuffers[ch];for(let i=0;i<buffer.length;i++){this.interleavedBuffers[i*chCount+ch]=buffer[i]}}return this.interleavedBuffers}OpusInitCodec(outRate,chCount,bitRate=undefined){let mErr=this.memory.mallocUint32(undefined);this.encoder=this._opus_encoder_create(outRate,chCount,OPUS_APPLICATION,mErr.pointer);let err=mErr.value;mErr.free();if(err!==OPUS_OK){throw new Error("Opus encodor initialization failed.")}if(bitRate){this.OpusSetOpusControl(OPUS_SET_BITRATE_REQUEST,bitRate)}}OpusSetOpusControl(request,vaArg){let value=this.memory.mallocInt32(vaArg);this._opus_encoder_ctl(this.encoder,request,value.pointer);value.free()}SpeexInitResampler(inputRate,outputRate,chCount){let mErr=this.memory.mallocUint32(undefined);this.resampler=this._speex_resampler_init(chCount,inputRate,outputRate,SPEEX_RESAMPLE_QUALITY,mErr.pointer);let err=mErr.value;mErr.free();if(err!==RESAMPLER_ERR_SUCCESS){throw new Error("Initializing resampler failed.")}}}Module.init=function(inputSampleRate,channelCount,bitsPerSecond){Module.encodedBuffers=[];Module.encoder=new 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(Did you create it yourself?)";obj["__destroy__"]();delete getCache(obj.__class__)[obj.ptr]}Module["destroy"]=destroy;function compare(obj1,obj2){return obj1.ptr===obj2.ptr}Module["compare"]=compare;function getPointer(obj){return obj.ptr}Module["getPointer"]=getPointer;function getClass(obj){return obj.__class__}Module["getClass"]=getClass;var ensureCache={buffer:0,size:0,pos:0,temps:[],needed:0,prepare:function(){if(ensureCache.needed){for(var i=0;i<ensureCache.temps.length;i++){Module["_free"](ensureCache.temps[i])}ensureCache.temps.length=0;Module["_free"](ensureCache.buffer);ensureCache.buffer=0;ensureCache.size+=ensureCache.needed;ensureCache.needed=0}if(!ensureCache.buffer){ensureCache.size+=128;ensureCache.buffer=Module["_malloc"](ensureCache.size);assert(ensureCache.buffer)}ensureCache.pos=0},alloc:function(array,view){assert(ensureCache.buffer);var bytes=view.BYTES_PER_ELEMENT;var len=array.length*bytes;len=len+7&-8;var ret;if(ensureCache.pos+len>=ensureCache.size){assert(len>0);ensureCache.needed+=len;ret=Module["_malloc"](len);ensureCache.temps.push(ret)}else{ret=ensureCache.buffer+ensureCache.pos;ensureCache.pos+=len}return ret},copy:function(array,view,offset){var offsetShifted=offset;var bytes=view.BYTES_PER_ELEMENT;switch(bytes){case 2:offsetShifted>>=1;break;case 4:offsetShifted>>=2;break;case 8:offsetShifted>>=3;break}for(var i=0;i<array.length;i++){view[offsetShifted+i]=array[i]}}};function VoidPtr(){throw"cannot construct a VoidPtr, no constructor in IDL"}VoidPtr.prototype=Object.create(WrapperObject.prototype);VoidPtr.prototype.constructor=VoidPtr;VoidPtr.prototype.__class__=VoidPtr;VoidPtr.__cache__={};Module["VoidPtr"]=VoidPtr;VoidPtr.prototype["__destroy__"]=VoidPtr.prototype.__destroy__=function(){var self=this.ptr;_emscripten_bind_VoidPtr___destroy___0(self)};function Container(){this.ptr=_emscripten_bind_Container_Container_0();getCache(Container)[this.ptr]=this}Container.prototype=Object.create(WrapperObject.prototype);Container.prototype.constructor=Container;Container.prototype.__class__=Container;Container.__cache__={};Module["Container"]=Container;Container.prototype["init"]=Container.prototype.init=function(sample_rate,channel_count,serial){var self=this.ptr;if(sample_rate&&typeof sample_rate==="object")sample_rate=sample_rate.ptr;if(channel_count&&typeof channel_count==="object")channel_count=channel_count.ptr;if(serial&&typeof serial==="object")serial=serial.ptr;_emscripten_bind_Container_init_3(self,sample_rate,channel_count,serial)};Container.prototype["writeFrame"]=Container.prototype.writeFrame=function(data,size,num_samples){var self=this.ptr;if(data&&typeof data==="object")data=data.ptr;if(size&&typeof size==="object")size=size.ptr;if(num_samples&&typeof num_samples==="object")num_samples=num_samples.ptr;_emscripten_bind_Container_writeFrame_3(self,data,size,num_samples)};Container.prototype["__destroy__"]=Container.prototype.__destroy__=function(){var self=this.ptr;_emscripten_bind_Container___destroy___0(self)};


  return Module
}
);
})();
if (typeof exports === 'object' && typeof module === 'object')
      module.exports = Module;
    else if (typeof define === 'function' && define['amd'])
      define([], function() { return Module; });
    else if (typeof exports === 'object')
      exports["Module"] = Module;