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增加GetContext、PowerDBFS，Recorder.CLog可以禁用日志输出，尝试修复iPhone14专有的AudioCont…
…ext.resume异常
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /****************** | ||
| 《【Demo库】WAV文件解码》 | ||
| 作者：高坚果 | ||
| 时间：2023-01-11 16:37 | ||
| 文档： | ||
| DemoFragment.DecodeWav(u8arr) | ||
| u8arr: wav的二进制数据Uint8Array | ||
| 返回：{ | ||
| pcm:[Int16,...] 解码出来的pcm数据Int16Array | ||
| sampleRate:16000 wav的采样率，也是pcm的采样率 | ||
| duration:123 时长 | ||
| bitRate:16 wav的位数，注意：pcm固定16位 | ||
| numChannels:1 wav的声道数，注意：pcm固定单声道 | ||
| } | ||
| 解码失败会抛异常 | ||
| ******************/ | ||
| ( | ||
| window.DemoFragment||(window.DemoFragment={}) | ||
| ).DecodeWav=function(u8arr){ | ||
| var eq=function(p,s){ | ||
| for(var i=0;i<s.length;i++){ | ||
| if(u8arr[p+i]!=s.charCodeAt(i)){ | ||
| return false; | ||
| }; | ||
| }; | ||
| return true; | ||
| }; | ||
| if(eq(0,"RIFF")&&eq(8,"WAVEfmt ")){ | ||
| var numCh=u8arr[22]; | ||
| if(u8arr[20]==1 && (numCh==1||numCh==2)){//raw pcm | ||
| var sampleRate=u8arr[24]+(u8arr[25]<<8)+(u8arr[26]<<16)+(u8arr[27]<<24); | ||
| var bitRate=u8arr[34]+(u8arr[35]<<8); | ||
|
|
||
| //搜索data块的位置 | ||
| var dataPos=0; // 44 或有更多块 | ||
| for(var i=12,iL=u8arr.length-4;i<iL;){ | ||
| if(u8arr[i]==100&&u8arr[i+1]==97&&u8arr[i+2]==116&&u8arr[i+3]==97){//eq(i,"data") | ||
| dataPos=i+8;break; | ||
| } | ||
| i+=4; | ||
| i+=4+u8arr[i]+(u8arr[i+1]<<8)+(u8arr[i+2]<<16)+(u8arr[i+3]<<24); | ||
| } | ||
| if(!dataPos){ | ||
| throw new Error("未找到wav的data块"); | ||
| } | ||
|
|
||
| //统一转成16位 | ||
| if(bitRate==16){ | ||
| var pcm=new Int16Array(u8arr.buffer.slice(dataPos)); | ||
| }else if(bitRate==8){//8位转成16位 | ||
| var pcm=new Int16Array(u8arr.length-dataPos); | ||
| for(var i=dataPos,j=0;j<pcm.length;i++,j++){ | ||
| pcm[j]=(u8arr[i]-128)<<8; | ||
| }; | ||
| }else{ | ||
| throw new Error("只支持8位或16位的wav格式"); | ||
| } | ||
| //转成单声道 | ||
| if(numCh==2){ | ||
| var pcm1=new Int16Array(pcm.length/2); | ||
| for(var i=0;i<pcm1.length;i++){ | ||
| pcm1[i]=pcm[i*2]; | ||
| } | ||
| pcm=pcm1; | ||
| } | ||
| var duration=Math.round(pcm.length/sampleRate*1000); | ||
|
|
||
| console.log("DecodeWav",sampleRate,bitRate,numCh | ||
| ,pcm.length | ||
| ,duration+"ms @"+dataPos); | ||
| return { | ||
| pcm:pcm | ||
| ,duration:duration | ||
| ,sampleRate:sampleRate | ||
| ,bitRate:bitRate | ||
| ,numChannels:numCh | ||
| }; | ||
| }; | ||
| throw new Error("只支持单声道或双声道wav格式"); | ||
| }; | ||
| throw new Error("非wav格式音频"); | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| /****************** | ||
| 《【测试】IIR低通、高通滤波》 | ||
| 作者：高坚果 | ||
| 时间：2023-01-11 16:32 | ||
| 移植java代码测试，测试结果： DigitalAudioFilter 比 MinimIIRFilter 过滤的干净，需要的频率能量损失也更小 | ||
| ******************/ | ||
|
|
||
| /******Java代码1******/ | ||
| //https://gitee.com/52jian/digital-audio-filter/blob/master/src/main/java/com/zj/filter/AudioFilter.java | ||
| //https://blog.csdn.net/Janix520/article/details/118411734 | ||
| Recorder.DigitalAudioFilter=function(useLowPass, sampleRate, freq){ | ||
| var Q=1; | ||
| var ov = 2 * Math.PI * freq / sampleRate; | ||
| var sn = Math.sin(ov); | ||
| var cs = Math.cos(ov); | ||
| var alpha = sn / (2 * Q); | ||
|
|
||
| var a0 = 1 + alpha; | ||
| var a1 = (-2 * cs) / a0; | ||
| var a2 = (1 - alpha) / a0; | ||
| if(useLowPass){ | ||
| var b0 = (1 - cs) / 2 / a0; | ||
| var b1 = (1 - cs) / a0; | ||
| var b2 = (1 - cs) / 2 / a0; | ||
| }else{ | ||
| var b0 = (1 + cs) / 2 / a0; | ||
| var b1 = -(1 + cs) / a0; | ||
| var b2 = (1 + cs) / 2 / a0; | ||
| } | ||
|
|
||
| var x1=0,x2=0,y=0,y1=0,y2=0; | ||
| return function(x){ | ||
| y = b0 * x + b1 * x1 + b2 * x2 - a1 * y1 - a2 * y2; | ||
| x2 = x1; | ||
| x1 = x; | ||
| y2 = y1; | ||
| y1 = y; | ||
| return y; | ||
| }; | ||
| }; | ||
|
|
||
|
|
||
| /******Java代码2******/ | ||
| //https://github.com/ddf/Minim/tree/master/src/main/java/ddf/minim/effects | ||
| Recorder.MinimIIRFilter=function(useLowPass, sampleRate, freq){ | ||
| var freqFrac = freq/sampleRate; | ||
| if(useLowPass=="FS"){ //LowPassFS.java | ||
| var x = Math.exp(-14.445 * freqFrac); | ||
| var a = [ Math.pow(1 - x, 4) ]; | ||
| var b = [ 4 * x, -6 * x * x, 4 * x * x * x, -x * x * x * x ]; | ||
| }else if(useLowPass){ //LowPassSP.java | ||
| var x = Math.exp(-2*Math.PI*freqFrac); | ||
| var a=[ 1 - x ]; | ||
| var b=[ x ]; | ||
| }else{ //HighPassSP.java | ||
| var x = Math.exp(-2 * Math.PI * freqFrac); | ||
| var a = [ (1+x)/2, -(1+x)/2 ]; | ||
| var b = [ x ]; | ||
| } | ||
|
|
||
| var out=[],ins=[]; | ||
| for(var i=0,L=Math.max(a.length,b.length);i<L;i++){ | ||
| out[i]=0; ins[i]=0; | ||
| } | ||
| return function(x){ //IIRFilter.java uGenerate | ||
| ins.splice(0,0,x); | ||
| ins.length--; | ||
|
|
||
| var y = 0; | ||
| for(var ci = 0; ci < a.length; ci++) { | ||
| y += a[ci] * ins[ci]; | ||
| } | ||
| for(var ci = 0; ci < b.length; ci++) { | ||
| y += b[ci] * out[ci]; | ||
| } | ||
| out.splice(0,0,y); | ||
| out.length--; | ||
| return y; | ||
| }; | ||
| }; | ||
|
|
||
|
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||
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|
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|
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|
|
||
| //=====测试代码================== | ||
| //加载录音框架 | ||
| Runtime.Import([ | ||
| {url:RootFolder+"/src/recorder-core.js",check:function(){return !window.Recorder}} | ||
| ,{url:RootFolder+"/src/engine/wav.js",check:function(){return !Recorder.prototype.wav}} | ||
| ,{url:RootFolder+"/assets/runtime-codes/fragment.decode.wav.js",check:function(){return !window.DemoFragment||!DemoFragment.DecodeWav}}//引入DemoFragment.DecodeWav | ||
| ]); | ||
|
|
||
| //显示控制按钮 | ||
| Runtime.Ctrls([ | ||
| {html:'<div class="testChoiceFile"></div>'} | ||
| ,{html:` | ||
| <div> | ||
| <div>低通：<input class="in_lowPassHz" style="width:100px">Hz，不填不滤波<span class="maxHz"></span></div> | ||
| <div>高通：<input class="in_highPassHz" style="width:100px">Hz，不填不滤波<span class="maxHz"></span></div> | ||
| <div>采样率：<input class="in_sampleRate" style="width:100px">，不填不转换采样率<span class="maxSampleRate"></span></div> | ||
| </div>`} | ||
| ,{name:"开始转换1",click:"test(1);Date.now"} | ||
| ,{name:"开始转换2",click:"test(2);Date.now"} | ||
| ,{name:"开始转换2_FS",click:"test(2,true);Date.now"} | ||
|
|
||
| ,{choiceFile:{multiple:false,title:"解码", | ||
| process:function(fileName,arrayBuffer,filesCount,fileIdx,endCall){ | ||
| if(/\.wav$/i.test(fileName)){ | ||
| try{ | ||
| var data=DemoFragment.DecodeWav(new Uint8Array(arrayBuffer)); | ||
| }catch(e){ | ||
| Runtime.Log(fileName+"解码失败："+e.message,1); | ||
| return endCall(); | ||
| } | ||
| setPcmData({pcm:data.pcm,sampleRate:data.sampleRate}); | ||
| return endCall(); | ||
| } | ||
| Runtime.DecodeAudio(fileName,arrayBuffer,function(data){ | ||
| setPcmData({pcm:data.data,sampleRate:data.sampleRate}); | ||
|
|
||
| endCall(); | ||
| },function(msg){ | ||
| Runtime.Log(msg,1); | ||
| endCall(); | ||
| }); | ||
| } | ||
| }} | ||
| ]); | ||
|
|
||
| $(".testChoiceFile").append($(".RuntimeChoiceFileBox")); | ||
| var pcmData; | ||
| var setPcmData=function(data){ | ||
| pcmData=data; | ||
| $(".maxHz").html("最高"+(data.sampleRate/2)+"Hz"); | ||
| $(".maxSampleRate").html("最大"+data.sampleRate); | ||
|
|
||
| var rec=Recorder({ | ||
| type:"wav",bitRate:16,sampleRate:data.sampleRate | ||
| }).mock(data.pcm,data.sampleRate); | ||
| rec.stop(function(blob,duration){ | ||
| Runtime.LogAudio(blob,duration,rec,"文件解码成功"); | ||
| Runtime.Log("pcm数据已准备好，可以开始转换了，pcm.sampleRate="+data.sampleRate,2); | ||
| }); | ||
| }; | ||
|
|
||
| var test=function(fn,useFS){ | ||
| if(!pcmData){ | ||
| Runtime.Log("请先拖一个文件进来解码",1); | ||
| return; | ||
| } | ||
| var srcSampleRate=pcmData.sampleRate; | ||
| var lowPassHz=+$(".in_lowPassHz").val()||0; | ||
| var highPassHz=+$(".in_highPassHz").val()||0; | ||
| var newSampleRate=+$(".in_sampleRate").val()||0; | ||
|
|
||
| var lowPass=null,highPass=null,fnName=""; | ||
| if(fn==1){ | ||
| fnName="DigitalAudioFilter"; | ||
| }else{ | ||
| fnName="MinimIIRFilter"; | ||
| } | ||
| if(lowPassHz) | ||
| lowPass=Recorder[fnName](useFS?"FS":true,srcSampleRate,lowPassHz); | ||
| if(highPassHz) | ||
| highPass=Recorder[fnName](false,srcSampleRate,highPassHz); | ||
|
|
||
| var pcm=new Int16Array(pcmData.pcm.length); | ||
| for(var i=0;i<pcm.length;i++){ | ||
| var v=pcmData.pcm[i]; | ||
| if(lowPass)v=lowPass(v); | ||
| if(highPass)v=highPass(v); | ||
| pcm[i]=v; | ||
| } | ||
|
|
||
| Runtime.Log("开始转换"+fn+" "+fnName+(useFS?".FS":"")+"："+JSON.stringify({lowPass:lowPassHz,highPass:highPassHz,sampleRate:newSampleRate,srcSampleRate:srcSampleRate}),"#aaa"); | ||
| var rec=Recorder({ | ||
| type:"wav",bitRate:16,sampleRate:newSampleRate||srcSampleRate | ||
| }).mock(pcm,srcSampleRate); | ||
| rec.stop(function(blob,duration){ | ||
| Runtime.LogAudio(blob,duration,rec,"已转换"+fn); | ||
| }); | ||
| }; |
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