9999999);
	}catch(e){
		showErr(e.message);
		return;
	};
	
	
	if(bitRate==16){
		var res=new Int16Array(arr.buffer);
	}else if(bitRate==8){
		var res=new Int16Array(arr.length);
		//8位转成16位
		for(var j=0;j<arr.length;j++){
			var b=arr[j];
			res[j]=(b-128)<<8;
		};
	}else if(bitRate==24){
		var res=new Int16Array(arr.length/3);
		for(var i=0,j=0;j<arr.length;){
			//24bit pcm转成浮点数
			//https://www.codeproject.com/articles/501521/how-to-convert-between-most-audio-forma