mirror of
https://github.com/babysor/MockingBird.git
synced 2024-03-22 13:11:31 +08:00
424 lines
12 KiB
JavaScript
424 lines
12 KiB
JavaScript
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/*
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mp3编码器，需带上mp3-engine.js引擎使用
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https://github.com/xiangyuecn/Recorder
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当然最佳推荐使用mp3、wav格式，代码也是优先照顾这两种格式
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浏览器支持情况
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https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats
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*/
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(function(){
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"use strict";
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Recorder.prototype.enc_mp3={
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stable:true
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,testmsg:"采样率范围48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000"
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};
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//*******标准UI线程转码支持函数************
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Recorder.prototype.mp3=function(res,True,False){
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var This=this,set=This.set,size=res.length;
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//优先采用worker编码，太低版本下面用老方法提供兼容
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var ctx=This.mp3_start(set);
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if(ctx){
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This.mp3_encode(ctx,res);
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This.mp3_complete(ctx,True,False,1);
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return;
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};
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//https://github.com/wangpengfei15975/recorder.js
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//https://github.com/zhuker/lamejs bug:采样率必须和源一致，不然8k时没有声音，有问题fix：https://github.com/zhuker/lamejs/pull/11
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var mp3=new Recorder.lamejs.Mp3Encoder(1,set.sampleRate,set.bitRate);
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var blockSize=57600;
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var data=[];
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var idx=0,mp3Size=0;
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var run=function(){
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if(idx<size){
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var buf=mp3.encodeBuffer(res.subarray(idx,idx+blockSize));
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if(buf.length>0){
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mp3Size+=buf.buffer.byteLength;
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data.push(buf.buffer);
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};
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idx+=blockSize;
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setTimeout(run);//尽量避免卡ui
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}else{
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var buf=mp3.flush();
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if(buf.length>0){
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mp3Size+=buf.buffer.byteLength;
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data.push(buf.buffer);
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};
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//去掉开头的标记信息帧
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var meta=mp3TrimFix.fn(data,mp3Size,size,set.sampleRate);
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mp3TrimFixSetMeta(meta,set);
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True(new Blob(data,{type:"audio/mp3"}));
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};
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};
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run();
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}
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//********边录边转码(Worker)支持函数，如果提供就代表可能支持，否则只支持标准转码*********
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//全局共享一个Worker，后台串行执行。如果每次都开一个新的，编码速度可能会慢很多，可能是浏览器运行缓存的因素，并且可能瞬间产生多个并行操作占用大量cpu
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var mp3Worker;
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Recorder.BindDestroy("mp3Worker",function(){
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console.log("mp3Worker Destroy");
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mp3Worker&&mp3Worker.terminate();
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mp3Worker=null;
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});
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Recorder.prototype.mp3_envCheck=function(envInfo,set){//检查环境下配置是否可用
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var errMsg="";
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//需要实时编码返回数据，此时需要检查环境是否有实时特性、和是否可实时编码
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if(set.takeoffEncodeChunk){
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if(!envInfo.canProcess){
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errMsg=envInfo.envName+"环境不支持实时处理";
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}else if(!newContext()){//浏览器不能创建实时编码环境
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errMsg="当前浏览器版本太低，无法实时处理";
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};
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};
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return errMsg;
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};
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Recorder.prototype.mp3_start=function(set){//如果返回null代表不支持
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return newContext(set);
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};
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var openList={id:0};
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var newContext=function(setOrNull){
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var worker=mp3Worker;
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try{
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if(!worker){
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var onmsg=function(e){
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var ed=e.data;
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var cur=wk_ctxs[ed.id];
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if(ed.action=="init"){
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wk_ctxs[ed.id]={
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sampleRate:ed.sampleRate
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,bitRate:ed.bitRate
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,takeoff:ed.takeoff
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,mp3Size:0
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,pcmSize:0
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,encArr:[]
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,encObj:new wk_lame.Mp3Encoder(1,ed.sampleRate,ed.bitRate)
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};
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}else if(!cur){
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return;
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};
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switch(ed.action){
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case "stop":
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cur.encObj=null;
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delete wk_ctxs[ed.id];
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break;
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case "encode":
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cur.pcmSize+=ed.pcm.length;
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var buf=cur.encObj.encodeBuffer(ed.pcm);
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if(buf.length>0){
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if(cur.takeoff){
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self.postMessage({action:"takeoff",id:ed.id,chunk:buf});
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}else{
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cur.mp3Size+=buf.buffer.byteLength;
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cur.encArr.push(buf.buffer);
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};
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};
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break;
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case "complete":
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var buf=cur.encObj.flush();
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if(buf.length>0){
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if(cur.takeoff){
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self.postMessage({action:"takeoff",id:ed.id,chunk:buf});
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}else{
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cur.mp3Size+=buf.buffer.byteLength;
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cur.encArr.push(buf.buffer);
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};
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};
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//去掉开头的标记信息帧
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var meta=wk_mp3TrimFix.fn(cur.encArr,cur.mp3Size,cur.pcmSize,cur.sampleRate);
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self.postMessage({
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action:ed.action
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,id:ed.id
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,blob:new Blob(cur.encArr,{type:"audio/mp3"})
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,meta:meta
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});
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break;
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};
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};
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//创建一个新Worker
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var jsCode=");wk_lame();var wk_ctxs={};self.onmessage="+onmsg;
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jsCode+=";var wk_mp3TrimFix={rm:"+mp3TrimFix.rm+",fn:"+mp3TrimFix.fn+"}";
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var lamejsCode=Recorder.lamejs.toString();
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var url=(window.URL||webkitURL).createObjectURL(new Blob(["var wk_lame=(",lamejsCode,jsCode], {type:"text/javascript"}));
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worker=new Worker(url);
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setTimeout(function(){
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(window.URL||webkitURL).revokeObjectURL(url);//必须要释放，不然每次调用内存都明显泄露内存
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},10000);//chrome 83 file协议下如果直接释放，将会使WebWorker无法启动
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worker.onmessage=function(e){
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var data=e.data;
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var ctx=openList[data.id];
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if(ctx){
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if(data.action=="takeoff"){
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//取走实时生成的mp3数据
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ctx.set.takeoffEncodeChunk(new Uint8Array(data.chunk.buffer));
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}else{
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//complete
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ctx.call&&ctx.call(data);
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ctx.call=null;
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};
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};
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};
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};
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var ctx={worker:worker,set:setOrNull,takeoffQueue:[]};
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if(setOrNull){
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ctx.id=++openList.id;
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openList[ctx.id]=ctx;
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worker.postMessage({
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action:"init"
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,id:ctx.id
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,sampleRate:setOrNull.sampleRate
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,bitRate:setOrNull.bitRate
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,takeoff:!!setOrNull.takeoffEncodeChunk
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,x:new Int16Array(5)//低版本浏览器不支持序列化TypedArray
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});
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}else{
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worker.postMessage({
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x:new Int16Array(5)//低版本浏览器不支持序列化TypedArray
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});
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};
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mp3Worker=worker;
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return ctx;
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}catch(e){//出错了就不要提供了
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worker&&worker.terminate();
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console.error(e);
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return null;
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};
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};
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Recorder.prototype.mp3_stop=function(startCtx){
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if(startCtx&&startCtx.worker){
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startCtx.worker.postMessage({
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action:"stop"
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,id:startCtx.id
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});
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startCtx.worker=null;
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delete openList[startCtx.id];
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//疑似泄露检测 排除id
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var opens=-1;
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for(var k in openList){
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opens++;
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};
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if(opens){
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console.warn("mp3 worker剩"+opens+"个在串行等待");
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};
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};
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};
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Recorder.prototype.mp3_encode=function(startCtx,pcm){
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if(startCtx&&startCtx.worker){
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startCtx.worker.postMessage({
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action:"encode"
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,id:startCtx.id
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,pcm:pcm
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});
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};
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};
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Recorder.prototype.mp3_complete=function(startCtx,True,False,autoStop){
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var This=this;
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if(startCtx&&startCtx.worker){
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startCtx.call=function(data){
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mp3TrimFixSetMeta(data.meta,startCtx.set);
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True(data.blob);
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if(autoStop){
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This.mp3_stop(startCtx);
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};
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};
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startCtx.worker.postMessage({
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action:"complete"
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,id:startCtx.id
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});
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}else{
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False("mp3编码器未打开");
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};
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};
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//*******辅助函数************
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/*读取lamejs编码出来的mp3信息，只能读特定格式，如果读取失败返回null
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mp3Buffers=[ArrayBuffer,...]
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length=mp3Buffers的数据二进制总长度
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*/
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Recorder.mp3ReadMeta=function(mp3Buffers,length){
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//kill babel-polyfill ES6 Number.parseInt 不然放到Worker里面找不到方法
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var parseInt_ES3=typeof(window)=="object"?window.parseInt:self.parseInt;
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var u8arr0=new Uint8Array(mp3Buffers[0]||[]);
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if(u8arr0.length<4){
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return null;
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};
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var byteAt=function(idx,u8){
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return ("0000000"+((u8||u8arr0)[idx]||0).toString(2)).substr(-8);
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};
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var b2=byteAt(0)+byteAt(1);
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var b4=byteAt(2)+byteAt(3);
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if(!/^1{11}/.test(b2)){//未发现帧同步
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return null;
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};
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var version=({"00":2.5,"10":2,"11":1})[b2.substr(11,2)];
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var layer=({"01":3})[b2.substr(13,2)];//仅支持Layer3
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var sampleRate=({ //lamejs -> Tables.samplerate_table
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"1":[44100, 48000, 32000]
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,"2":[22050, 24000, 16000]
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,"2.5":[11025, 12000, 8000]
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})[version];
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sampleRate&&(sampleRate=sampleRate[parseInt_ES3(b4.substr(4,2),2)]);
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var bitRate=[ //lamejs -> Tables.bitrate_table
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[0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160] //MPEG 2 2.5
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,[0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320]//MPEG 1
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][version==1?1:0][parseInt_ES3(b4.substr(0,4),2)];
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if(!version || !layer || !bitRate || !sampleRate){
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return null;
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};
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var duration=Math.round(length*8/bitRate);
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var frame=layer==1?384:layer==2?1152:version==1?1152:576;
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var frameDurationFloat=frame/sampleRate*1000;
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var frameSize=Math.floor((frame*bitRate)/8/sampleRate*1000);
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//检测是否存在Layer3帧填充1字节。这里只获取第二帧的填充信息，首帧永远没有填充。其他帧可能隔一帧出现一个填充，或者隔很多帧出现一个填充；目测是取决于frameSize未舍入时的小数部分，因为有些采样率的frameSize会出现小数（11025、22050、44100 典型的除不尽），然后字节数无法表示这种小数，就通过一定步长来填充弥补小数部分丢失
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var hasPadding=0,seek=0;
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for(var i=0;i<mp3Buffers.length;i++){
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//寻找第二帧
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var buf=mp3Buffers[i];
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seek+=buf.byteLength;
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if(seek>=frameSize+3){
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var buf8=new Uint8Array(buf);
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var idx=buf.byteLength-(seek-(frameSize+3)+1);
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var ib4=byteAt(idx,buf8);
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hasPadding=ib4.charAt(6)=="1";
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break;
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};
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};
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if(hasPadding){
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frameSize++;
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};
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|||
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|
return {
|
|||
|
|
version:version //1 2 2.5 -> MPEG1 MPEG2 MPEG2.5
|
|||
|
|
,layer:layer//3 -> Layer3
|
|||
|
|
,sampleRate:sampleRate //采样率 hz
|
|||
|
|
,bitRate:bitRate //比特率 kbps
|
|||
|
|
|
|||
|
|
,duration:duration //音频时长 ms
|
|||
|
|
,size:length //总长度 byte
|
|||
|
|
,hasPadding:hasPadding //是否存在1字节填充，首帧永远没有，这个值其实代表的第二帧是否有填充，并不代表其他帧的
|
|||
|
|
,frameSize:frameSize //每帧最大长度，含可能存在的1字节padding byte
|
|||
|
|
,frameDurationFloat:frameDurationFloat //每帧时长，含小数 ms
|
|||
|
|
};
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
//去掉lamejs开头的标记信息帧，免得mp3解码出来的时长比pcm的长太多
|
|||
|
|
var mp3TrimFix={//minfiy keep name
|
|||
|
|
rm:Recorder.mp3ReadMeta
|
|||
|
|
,fn:function(mp3Buffers,length,pcmLength,pcmSampleRate){
|
|||
|
|
var meta=this.rm(mp3Buffers,length);
|
|||
|
|
if(!meta){
|
|||
|
|
return {err:"mp3非预定格式"};
|
|||
|
|
};
|
|||
|
|
var pcmDuration=Math.round(pcmLength/pcmSampleRate*1000);
|
|||
|
|
|
|||
|
|
//开头多出这么多帧，移除掉；正常情况下最多为2帧
|
|||
|
|
var num=Math.floor((meta.duration-pcmDuration)/meta.frameDurationFloat);
|
|||
|
|
if(num>0){
|
|||
|
|
var size=num*meta.frameSize-(meta.hasPadding?1:0);//首帧没有填充，第二帧可能有填充，这里假设最多为2帧（测试并未出现3帧以上情况），其他帧不管，就算出现了并且导致了错误后面自动容错
|
|||
|
|
length-=size;
|
|||
|
|
var arr0=0,arrs=[];
|
|||
|
|
for(var i=0;i<mp3Buffers.length;i++){
|
|||
|
|
var arr=mp3Buffers[i];
|
|||
|
|
if(size<=0){
|
|||
|
|
break;
|
|||
|
|
};
|
|||
|
|
if(size>=arr.byteLength){
|
|||
|
|
size-=arr.byteLength;
|
|||
|
|
arrs.push(arr);
|
|||
|
|
mp3Buffers.splice(i,1);
|
|||
|
|
i--;
|
|||
|
|
}else{
|
|||
|
|
mp3Buffers[i]=arr.slice(size);
|
|||
|
|
arr0=arr;
|
|||
|
|
size=0;
|
|||
|
|
};
|
|||
|
|
};
|
|||
|
|
var checkMeta=this.rm(mp3Buffers,length);
|
|||
|
|
if(!checkMeta){
|
|||
|
|
//还原变更，应该不太可能会出现
|
|||
|
|
arr0&&(mp3Buffers[0]=arr0);
|
|||
|
|
for(var i=0;i<arrs.length;i++){
|
|||
|
|
mp3Buffers.splice(i,0,arrs[i]);
|
|||
|
|
};
|
|||
|
|
meta.err="fix后数据错误，已还原，错误原因不明";
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
var fix=meta.trimFix={};
|
|||
|
|
fix.remove=num;
|
|||
|
|
fix.removeDuration=Math.round(num*meta.frameDurationFloat);
|
|||
|
|
fix.duration=Math.round(length*8/meta.bitRate);
|
|||
|
|
};
|
|||
|
|
return meta;
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
var mp3TrimFixSetMeta=function(meta,set){
|
|||
|
|
var tag="MP3信息 ";
|
|||
|
|
if(meta.sampleRate&&meta.sampleRate!=set.sampleRate || meta.bitRate&&meta.bitRate!=set.bitRate){
|
|||
|
|
console.warn(tag+"和设置的不匹配set:"+set.bitRate+"kbps "+set.sampleRate+"hz，已更新set:"+meta.bitRate+"kbps "+meta.sampleRate+"hz",set);
|
|||
|
|
set.sampleRate=meta.sampleRate;
|
|||
|
|
set.bitRate=meta.bitRate;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
var trimFix=meta.trimFix;
|
|||
|
|
if(trimFix){
|
|||
|
|
tag+="Fix移除"+trimFix.remove+"帧"+trimFix.removeDuration+"ms -> "+trimFix.duration+"ms";
|
|||
|
|
if(trimFix.remove>2){
|
|||
|
|
meta.err=(meta.err?meta.err+", ":"")+"移除帧数过多";
|
|||
|
|
};
|
|||
|
|
}else{
|
|||
|
|
tag+=(meta.duration||"-")+"ms";
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
if(meta.err){
|
|||
|
|
console.error(tag,meta.err,meta);
|
|||
|
|
}else{
|
|||
|
|
console.log(tag,meta);
|
|||
|
|
};
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
})();
|