text: /*
  
  	This file is part of OpenWebRX,
  	an open-source SDR receiver software with a web UI.
  	Copyright (c) 2013-2015 by Andras Retzler <randras@sdr.hu>
  
      This program is free software: you can redistribute it and/or modify
      it under the terms of the GNU Affero General Public License as
      published by the Free Software Foundation, either version 3 of the
      License, or (at your option) any later version.
  
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU Affero General Public License for more details.
  
      You should have received a copy of the GNU Affero General Public License
      along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  """
  
  */
  
  is_firefox=navigator.userAgent.indexOf("Firefox")!=-1;
  
  function arrayBufferToString(buf) {
  	//http://stackoverflow.com/questions/6965107/converting-between-strings-and-arraybuffers
  	return String.fromCharCode.apply(null, new Uint8Array(buf));
  }
  
  function getFirstChars(buf, num)
  {
  	var u8buf=new Uint8Array(buf);
  	var output=String();
  	num=Math.min(num,u8buf.length);
  	for(i=0;i<num;i++) output+=String.fromCharCode(u8buf[i]);
  	return output;
  }
  
  var bandwidth;
  var center_freq;
  var audio_buffer_current_size_debug=0;
  var audio_buffer_all_size_debug=0;
  var audio_buffer_current_count_debug=0;
  var audio_buffer_current_size=0;
  var fft_size;
  var fft_fps;
  var fft_compression="none";
  var fft_codec=new sdrjs.ImaAdpcm();
  var audio_compression="none";
  var waterfall_setup_done=0;
  var waterfall_queue = [];
  var waterfall_timer;
  var secondary_fft_size;
  
  /*function fade(something,from,to,time_ms,fps)
  {
  	something.style.opacity=from;
  	something.fade_i=0;
  	n_of_iters=time_ms/(1000/fps);
  	change=(to-from)/(n_of_iters-1);
  
  	something.fade_timer=window.setInterval(
  		function(){
  			if(something.fade_i++<n_of_iters)
  				something.style.opacity=parseFloat(something.style.opacity)+change;
  			else
  				{something.style.opacity=to; window.clearInterval(something.fade_timer); }
  		},1000/fps);
  }*/
  
  var rx_photo_state=1;
  
  function e(what) { return document.getElementById(what); }
  
  ios = /iPad|iPod|iPhone|Chrome/.test(navigator.userAgent);
  is_chrome = /Chrome/.test(navigator.userAgent);
  //alert("ios="+ios.toString()+"  "+navigator.userAgent);
  
  function init_rx_photo()
  {
  	e("webrx-top-photo-clip").style.maxHeight=rx_photo_height.toString()+"px";
  	window.setTimeout(function() { animate(e("webrx-rx-photo-title"),"opacity","",1,0,1,500,30); },1000);
  	window.setTimeout(function() { animate(e("webrx-rx-photo-desc"),"opacity","",1,0,1,500,30); },1500);
  	window.setTimeout(function() { close_rx_photo() },2500);
  }
  
  dont_toggle_rx_photo_flag=0;
  
  function dont_toggle_rx_photo()
  {
  	dont_toggle_rx_photo_flag=1;
  }
  
  function toggle_rx_photo()
  {
  	if(dont_toggle_rx_photo_flag) { dont_toggle_rx_photo_flag=0; return; }
  	if(rx_photo_state) close_rx_photo();
  	else open_rx_photo()
  }
  
  function close_rx_photo()
  {
  	rx_photo_state=0;
  	animate_to(e("webrx-top-photo-clip"),"maxHeight","px",67,0.93,1000,60,function(){resize_waterfall_container(true);});
  	e("openwebrx-rx-details-arrow-down").style.display="block";
  	e("openwebrx-rx-details-arrow-up").style.display="none";
  }
  
  function open_rx_photo()
  {
  	rx_photo_state=1;
  	e("webrx-rx-photo-desc").style.opacity=1;
  	e("webrx-rx-photo-title").style.opacity=1;
  	animate_to(e("webrx-top-photo-clip"),"maxHeight","px",rx_photo_height,0.93,1000,60,function(){resize_waterfall_container(true);});
  	e("openwebrx-rx-details-arrow-down").style.display="none";
  	e("openwebrx-rx-details-arrow-up").style.display="block";
  }
  
  function style_value(of_what,which)
  {
  	if(of_what.currentStyle) return of_what.currentStyle[which];
  	else if (window.getComputedStyle) return document.defaultView.getComputedStyle(of_what,null).getPropertyValue(which);
  }
  
  function updateVolume()
  {
  	volume = parseFloat(e("openwebrx-panel-volume").value) / 100;
  }
  
  function toggleMute()
  {
  	if (mute) {
  		mute = false;
  		e("openwebrx-mute-on").id="openwebrx-mute-off";
  		e("openwebrx-mute-img").src="gfx/openwebrx-speaker.png";
  		e("openwebrx-panel-volume").disabled=false;
  		e("openwebrx-panel-volume").style.opacity=1.0;
  		e("openwebrx-panel-volume").value = volumeBeforeMute;
  	} else {
  		mute = true;
  		e("openwebrx-mute-off").id="openwebrx-mute-on";
  		e("openwebrx-mute-img").src="gfx/openwebrx-speaker-muted.png";
  		e("openwebrx-panel-volume").disabled=true;
  		e("openwebrx-panel-volume").style.opacity=0.5;
  		volumeBeforeMute = e("openwebrx-panel-volume").value;
  		e("openwebrx-panel-volume").value=0;
  	}
  
  	updateVolume();
  }
  
  function zoomInOneStep ()  { zoom_set(zoom_level+1); }
  function zoomOutOneStep () { zoom_set(zoom_level-1); }
  function zoomInTotal ()    { zoom_set(zoom_levels.length-1); }
  function zoomOutTotal ()   { zoom_set(0); }
  function setSquelchDefault() { e("openwebrx-panel-squelch").value=0; }
  function setSquelchToAuto() { e("openwebrx-panel-squelch").value=(getLogSmeterValue(smeter_level)+10).toString(); updateSquelch(); }
  function updateSquelch()
  {
  	var sliderValue=parseInt(e("openwebrx-panel-squelch").value);
  	var outputValue=(sliderValue==parseInt(e("openwebrx-panel-squelch").min))?0:getLinearSmeterValue(sliderValue);
  	ws.send("SET squelch_level="+outputValue.toString());
  }
  
  function updateWaterfallColors(which)
  {
  	wfmax=e("openwebrx-waterfall-color-max");
  	wfmin=e("openwebrx-waterfall-color-min");
  	if(parseInt(wfmin.value)>=parseInt(wfmax.value))
  	{
  			if(!which) wfmin.value=(parseInt(wfmax.value)-1).toString();
  			else wfmax.value=(parseInt(wfmin.value)+1).toString();
  	}
  	waterfall_min_level=parseInt(wfmin.value);
  	waterfall_max_level=parseInt(wfmax.value);
  }
  function waterfallColorsDefault()
  {
  	waterfall_min_level=waterfall_min_level_default;
  	waterfall_max_level=waterfall_max_level_default;
  	e("openwebrx-waterfall-color-min").value=waterfall_min_level.toString();
  	e("openwebrx-waterfall-color-max").value=waterfall_max_level.toString();
  }
  
  function waterfallColorsAuto()
  {
  	e("openwebrx-waterfall-color-min").value=(waterfall_measure_minmax_min-waterfall_auto_level_margin[0]).toString();
  	e("openwebrx-waterfall-color-max").value=(waterfall_measure_minmax_max+waterfall_auto_level_margin[1]).toString();
  	updateWaterfallColors(0);
  }
  
  function setSmeterRelativeValue(value)
  {
  	if(value<0) value=0;
  	if(value>1.0) value=1.0;
  	var bar=e("openwebrx-smeter-bar");
  	var outer=e("openwebrx-smeter-outer");
  	bar.style.width=(outer.offsetWidth*value).toString()+"px";
  	bgRed="linear-gradient(to top, #ff5939 , #961700)";
  	bgGreen="linear-gradient(to top, #22ff2f , #008908)";
  	bgYellow="linear-gradient(to top, #fff720 , #a49f00)";
  	bar.style.background=(value>0.9)?bgRed:((value>0.7)?bgYellow:bgGreen);
  	//bar.style.backgroundColor=(value>0.9)?"#ff5939":((value>0.7)?"#fff720":"#22ff2f");
  }
  
  function getLogSmeterValue(value)
  {
  	return 10*Math.log10(value);
  }
  
  function getLinearSmeterValue(db_value)
  {
  	return Math.pow(10,db_value/10);
  }
  
  function setSmeterAbsoluteValue(value) //the value that comes from `csdr squelch_and_smeter_cc`
  {
  	var logValue=getLogSmeterValue(value);
  	var lowLevel=waterfall_min_level-20;
  	var highLevel=waterfall_max_level+20;
  	var percent=(logValue-lowLevel)/(highLevel-lowLevel);
  	setSmeterRelativeValue(percent);
  	e("openwebrx-smeter-db").innerHTML=logValue.toFixed(1)+" dB";
  }
  
  function typeInAnimation(element,timeout,what,onFinish)
  {
  	if(!what) { onFinish(); return; }
  	element.innerHTML+=what[0];
  	window.setTimeout(	function(){typeInAnimation(element,timeout,what.substring(1),onFinish);}, timeout );
  }
  
  
  
  // ========================================================
  // =================  ANIMATION ROUTINES  =================
  // ========================================================
  
  function animate(object,style_name,unit,from,to,accel,time_ms,fps,to_exec)
  {
  	//console.log(object.className);
  	if(typeof to_exec=="undefined") to_exec=0;
  	object.style[style_name]=from.toString()+unit;
  	object.anim_i=0;
  	n_of_iters=time_ms/(1000/fps);
  	change=(to-from)/(n_of_iters);
  	if(typeof object.anim_timer!="undefined") { window.clearInterval(object.anim_timer);  }
  	object.anim_timer=window.setInterval(
  		function(){
  			if(object.anim_i++<n_of_iters)
  			{
  				if(accel==1) object.style[style_name]=(parseFloat(object.style[style_name])+change).toString()+unit;
  				else
  				{
  					remain=parseFloat(object.style[style_name])-to;
  					if(Math.abs(remain)>9||unit!="px") new_val=(to+accel*remain);
  					else {if(Math.abs(remain)<2) new_val=to;
  					else new_val=to+remain-(remain/Math.abs(remain));}
  					object.style[style_name]=new_val.toString()+unit;
  				}
  			}
  			else
  				{object.style[style_name]=to.toString()+unit; window.clearInterval(object.anim_timer); delete object.anim_timer; }
  			if(to_exec!=0) to_exec();
  		},1000/fps);
  }
  
  function animate_to(object,style_name,unit,to,accel,time_ms,fps,to_exec)
  {
  	from=parseFloat(style_value(object,style_name));
  	animate(object,style_name,unit,from,to,accel,time_ms,fps,to_exec);
  }
  
  
  // ========================================================
  // ================  DEMODULATOR ROUTINES  ================
  // ========================================================
  
  demodulators=[]
  
  demodulator_color_index=0;
  demodulator_colors=["#ffff00", "#00ff00", "#00ffff", "#058cff", "#ff9600", "#a1ff39", "#ff4e39", "#ff5dbd"]
  function demodulators_get_next_color()
  {
  	if(demodulator_color_index>=demodulator_colors.length) demodulator_color_index=0;
  	return(demodulator_colors[demodulator_color_index++]);
  }
  
  function demod_envelope_draw(range, from, to, color, line)
  {  //                                               ____
  	// Draws a standard filter envelope like this: _/    \_
     // Parameters are given in offset frequency (Hz).
     // Envelope is drawn on the scale canvas.
  	// A "drag range" object is returned, containing information about the draggable areas of the envelope
  	// (beginning, ending and the line showing the offset frequency).
  	if(typeof color == "undefined") color="#ffff00"; //yellow
  	env_bounding_line_w=5;   //
  	env_att_w=5;             //     _______   ___env_h2 in px   ___|_____
  	env_h1=17;               //   _/|      \_ ___env_h1 in px _/   |_    \_
  	env_h2=5;                //   |||env_att_line_w                |_env_lineplus
  	env_lineplus=1;          //   ||env_bounding_line_w
  	env_line_click_area=6;
  	//range=get_visible_freq_range();
  	from_px=scale_px_from_freq(from,range);
  	to_px=scale_px_from_freq(to,range);
  	if(to_px<from_px) /* swap'em */ { temp_px=to_px; to_px=from_px; from_px=temp_px; }
  
  	/*from_px-=env_bounding_line_w/2;
  	to_px+=env_bounding_line_w/2;*/
  	from_px-=(env_att_w+env_bounding_line_w);
  	to_px+=(env_att_w+env_bounding_line_w);
  	// do drawing:
  	scale_ctx.lineWidth=3;
  	scale_ctx.strokeStyle=color;
  	scale_ctx.fillStyle = color;
  	var drag_ranges={ envelope_on_screen: false, line_on_screen: false };
  	if(!(to_px<0||from_px>window.innerWidth)) // out of screen?
  	{
  		drag_ranges.beginning={x1:from_px, x2: from_px+env_bounding_line_w+env_att_w};
  		drag_ranges.ending={x1:to_px-env_bounding_line_w-env_att_w, x2: to_px};
  		drag_ranges.whole_envelope={x1:from_px, x2: to_px};
  		drag_ranges.envelope_on_screen=true;
  		scale_ctx.beginPath();
  		scale_ctx.moveTo(from_px,env_h1);
  		scale_ctx.lineTo(from_px+env_bounding_line_w, env_h1);
  		scale_ctx.lineTo(from_px+env_bounding_line_w+env_att_w, env_h2);
  		scale_ctx.lineTo(to_px-env_bounding_line_w-env_att_w, env_h2);
  		scale_ctx.lineTo(to_px-env_bounding_line_w, env_h1);
  		scale_ctx.lineTo(to_px, env_h1);
  		scale_ctx.globalAlpha = 0.3;
  		scale_ctx.fill();
  		scale_ctx.globalAlpha = 1;
  		scale_ctx.stroke();
  	}
  	if(typeof line != "undefined") // out of screen?
  	{
  		line_px=scale_px_from_freq(line,range);
  		if(!(line_px<0||line_px>window.innerWidth))
  		{
  			drag_ranges.line={x1:line_px-env_line_click_area/2, x2: line_px+env_line_click_area/2};
  			drag_ranges.line_on_screen=true;
  			scale_ctx.moveTo(line_px,env_h1+env_lineplus);
  			scale_ctx.lineTo(line_px,env_h2-env_lineplus);
  			scale_ctx.stroke();
  		}
  	}
  	return drag_ranges;
  }
  
  function demod_envelope_where_clicked(x, drag_ranges, key_modifiers)
  {  // Check exactly what the user has clicked based on ranges returned by demod_envelope_draw().
  	in_range=function(x,range) { return range.x1<=x&&range.x2>=x; }
  	dr=demodulator.draggable_ranges;
  
  	if(key_modifiers.shiftKey)
  	{
  		//Check first: shift + center drag emulates BFO knob
  		if(drag_ranges.line_on_screen&&in_range(x,drag_ranges.line)) return dr.bfo;
  		//Check second: shift + envelope drag emulates PBF knob
  		if(drag_ranges.envelope_on_screen&&in_range(x,drag_ranges.whole_envelope)) return dr.pbs;
  	}
  	if(drag_ranges.envelope_on_screen)
  	{
  		// For low and high cut:
  		if(in_range(x,drag_ranges.beginning)) return dr.beginning;
  		if(in_range(x,drag_ranges.ending)) return dr.ending;
  		// Last priority: having clicked anything else on the envelope, without holding the shift key
  		if(in_range(x,drag_ranges.whole_envelope)) return dr.anything_else;
  	}
  	return dr.none; //User doesn't drag the envelope for this demodulator
  }
  
  //******* class demodulator *******
  // this can be used as a base class for ANY demodulator
  demodulator=function(offset_frequency)
  {
  	//console.log("this too");
  	this.offset_frequency=offset_frequency;
  	this.has_audio_output=true;
  	this.has_text_output=false;
  	this.envelope={};
  	this.color=demodulators_get_next_color();
  	this.stop=function(){};
  }
  //ranges on filter envelope that can be dragged:
  demodulator.draggable_ranges={none: 0, beginning:1 /*from*/, ending: 2 /*to*/, anything_else: 3, bfo: 4 /*line (while holding shift)*/, pbs: 5 } //to which parameter these correspond in demod_envelope_draw()
  
  //******* class demodulator_default_analog *******
  // This can be used as a base for basic audio demodulators.
  // It already supports most basic modulations used for ham radio and commercial services: AM/FM/LSB/USB
  
  demodulator_response_time=50;
  //in ms; if we don't limit the number of SETs sent to the server, audio will underrun (possibly output buffer is cleared on SETs in GNU Radio
  
  function demodulator_default_analog(offset_frequency,subtype)
  {
  	//console.log("hopefully this happens");
  	//http://stackoverflow.com/questions/4152931/javascript-inheritance-call-super-constructor-or-use-prototype-chain
  	demodulator.call(this,offset_frequency);
  	this.subtype=subtype;
  	this.filter={
  		min_passband: 100,
  		high_cut_limit: (audio_server_output_rate/2)-1, //audio_context.sampleRate/2,
  		low_cut_limit: (-audio_server_output_rate/2)+1 //-audio_context.sampleRate/2
  	};
  	//Subtypes only define some filter parameters and the mod string sent to server,
  	//so you may set these parameters in your custom child class.
  	//Why? As of demodulation is done on the server, difference is mainly on the server side.
  	this.server_mod=subtype;
  	if(subtype=="lsb")
  	{
  		this.low_cut=-3000;
  		this.high_cut=-300;
  		this.server_mod="ssb";
  	}
  	else if(subtype=="usb")
  	{
  		this.low_cut=300;
  		this.high_cut=3000;
  		this.server_mod="ssb";
  	}
  	else if(subtype=="cw")
  	{
  		this.low_cut=700;
  		this.high_cut=900;
  		this.server_mod="ssb";
  	}
  	else if(subtype=="nfm")
  	{
  		this.low_cut=-4000;
  		this.high_cut=4000;
  	}
  	else if(subtype=="am")
  	{
  		this.low_cut=-4000;
  		this.high_cut=4000;
  	}
  
  	this.wait_for_timer=false;
  	this.set_after=false;
  	this.set=function()
  	{ //set() is a wrapper to call doset(), but it ensures that doset won't execute more frequently than demodulator_response_time.
  		if(!this.wait_for_timer)
  		{
  			this.doset(false);
  			this.set_after=false;
  			this.wait_for_timer=true;
  			timeout_this=this; //http://stackoverflow.com/a/2130411
  			window.setTimeout(function() {
  				timeout_this.wait_for_timer=false;
  				if(timeout_this.set_after) timeout_this.set();
  			},demodulator_response_time);
  		}
  		else
  		{
  			this.set_after=true;
  		}
  	}
  
  	this.doset=function(first_time)
  	{  //this function sends demodulator parameters to the server
  		ws.send("SET"+((first_time)?" mod="+this.server_mod:"")+
  			" low_cut="+this.low_cut.toString()+" high_cut="+this.high_cut.toString()+
  			" offset_freq="+this.offset_frequency.toString());
  	}
  	this.doset(true); //we set parameters on object creation
  
  	//******* envelope object *******
     // for drawing the filter envelope above scale
  	this.envelope.parent=this;
  
  	this.envelope.draw=function(visible_range)
  	{
  		this.visible_range=visible_range;
  		this.drag_ranges=demod_envelope_draw(range,
  				center_freq+this.parent.offset_frequency+this.parent.low_cut,
  				center_freq+this.parent.offset_frequency+this.parent.high_cut,
  				this.color,center_freq+this.parent.offset_frequency);
  	};
  
  	// event handlers
  	this.envelope.drag_start=function(x, key_modifiers)
  	{
  		this.key_modifiers=key_modifiers;
  		this.dragged_range=demod_envelope_where_clicked(x,this.drag_ranges, key_modifiers);
  		//console.log("dragged_range: "+this.dragged_range.toString());
  		this.drag_origin={
  			x: x,
  			low_cut: this.parent.low_cut,
  			high_cut: this.parent.high_cut,
  			offset_frequency: this.parent.offset_frequency
  		};
  		return this.dragged_range!=demodulator.draggable_ranges.none;
  	};
  
  	this.envelope.drag_move=function(x)
  	{
  		dr=demodulator.draggable_ranges;
  		if(this.dragged_range==dr.none) return false; // we return if user is not dragging (us) at all
  		freq_change=Math.round(this.visible_range.hps*(x-this.drag_origin.x));
  		/*if(this.dragged_range==dr.beginning||this.dragged_range==dr.ending)
  		{
  			//we don't let the passband be too small
  			if(this.parent.low_cut+new_freq_change<=this.parent.high_cut-this.parent.filter.min_passband) this.freq_change=new_freq_change;
  			else return;
  		}
  		var new_value;*/
  
  		//dragging the line in the middle of the filter envelope while holding Shift does emulate
  		//the BFO knob on radio equipment: moving offset frequency, while passband remains unchanged
  		//Filter passband moves in the opposite direction than dragged, hence the minus below.
  		minus=(this.dragged_range==dr.bfo)?-1:1;
  		//dragging any other parts of the filter envelope while holding Shift does emulate the PBS knob
  		//(PassBand Shift) on radio equipment: PBS does move the whole passband without moving the offset
  		//frequency.
  		if(this.dragged_range==dr.beginning||this.dragged_range==dr.bfo||this.dragged_range==dr.pbs)
  		{
  			//we don't let low_cut go beyond its limits
  			if((new_value=this.drag_origin.low_cut+minus*freq_change)<this.parent.filter.low_cut_limit) return true;
  			//nor the filter passband be too small
  			if(this.parent.high_cut-new_value<this.parent.filter.min_passband) return true;
  			//sanity check to prevent GNU Radio "firdes check failed: fa <= fb"
  			if(new_value>=this.parent.high_cut) return true;
  			this.parent.low_cut=new_value;
  		}
  		if(this.dragged_range==dr.ending||this.dragged_range==dr.bfo||this.dragged_range==dr.pbs)
  		{
  			//we don't let high_cut go beyond its limits
  			if((new_value=this.drag_origin.high_cut+minus*freq_change)>this.parent.filter.high_cut_limit) return true;
  			//nor the filter passband be too small
  			if(new_value-this.parent.low_cut<this.parent.filter.min_passband) return true;
  			//sanity check to prevent GNU Radio "firdes check failed: fa <= fb"
  			if(new_value<=this.parent.low_cut) return true;
  			this.parent.high_cut=new_value;
  		}
  		if(this.dragged_range==dr.anything_else||this.dragged_range==dr.bfo)
  		{
  			//when any other part of the envelope is dragged, the offset frequency is changed (whole passband also moves with it)
  			new_value=this.drag_origin.offset_frequency+freq_change;
  			if(new_value>bandwidth/2||new_value<-bandwidth/2) return true; //we don't allow tuning above Nyquist frequency :-)
  			this.parent.offset_frequency=new_value;
  		}
  		//now do the actual modifications:
  		mkenvelopes(this.visible_range);
  		this.parent.set();
  		//will have to change this when changing to multi-demodulator mode:
  		e("webrx-actual-freq").innerHTML=format_frequency("{x} MHz",center_freq+this.parent.offset_frequency,1e6,4);
  		return true;
  	};
  
  	this.envelope.drag_end=function(x)
  	{ //in this demodulator we've already changed values in the drag_move() function so we shouldn't do too much here.
  		demodulator_buttons_update();
  		to_return=this.dragged_range!=demodulator.draggable_ranges.none; //this part is required for cliking anywhere on the scale to set offset
  		this.dragged_range=demodulator.draggable_ranges.none;
  		return to_return;
  	};
  
  }
  
  demodulator_default_analog.prototype=new demodulator();
  
  function mkenvelopes(visible_range) //called from mkscale
  {
  	scale_ctx.clearRect(0,0,scale_ctx.canvas.width,22); //clear the upper part of the canvas (where filter envelopes reside)
  	for (var i=0;i<demodulators.length;i++)
  	{
  		demodulators[i].envelope.draw(visible_range);
  	}
      if(demodulators.length) secondary_demod_waterfall_set_zoom(demodulators[0].low_cut, demodulators[0].high_cut);
  }
  
  function demodulator_remove(which)
  {
  	demodulators[which].stop();
  	demodulators.splice(which,1);
  }
  
  function demodulator_add(what)
  {
  	demodulators.push(what);
  	mkenvelopes(get_visible_freq_range());
  }
  
  last_analog_demodulator_subtype = 'nfm';
  last_digital_demodulator_subtype = 'bpsk31';
  
  function demodulator_analog_replace(subtype, for_digital)
  { //this function should only exist until the multi-demodulator capability is added
      if(!(typeof for_digital !== "undefined" && for_digital && secondary_demod)) 
      { 
          secondary_demod_close_window(); 
          secondary_demod_listbox_update(); 
      }
      last_analog_demodulator_subtype = subtype;
  	var temp_offset=0;
  	if(demodulators.length)
  	{
  		temp_offset=demodulators[0].offset_frequency;
  		demodulator_remove(0);
  	}
  	demodulator_add(new demodulator_default_analog(temp_offset,subtype));
  	demodulator_buttons_update();
  }
  
  function demodulator_set_offset_frequency(which,to_what)
  {
  	if(to_what>bandwidth/2||to_what<-bandwidth/2) return;
  	demodulators[0].offset_frequency=Math.round(to_what);
  	demodulators[0].set();
  	mkenvelopes(get_visible_freq_range());
  }
  
  
  // ========================================================
  // ===================  SCALE ROUTINES  ===================
  // ========================================================
  
  var scale_ctx;
  var scale_canvas;
  
  function scale_setup()
  {
  	e("webrx-actual-freq").innerHTML=format_frequency("{x} MHz",canvas_get_frequency(window.innerWidth/2),1e6,4);
  	scale_canvas=e("openwebrx-scale-canvas");
  	scale_ctx=scale_canvas.getContext("2d");
  	scale_canvas.addEventListener("mousedown", scale_canvas_mousedown, false);
  	scale_canvas.addEventListener("mousemove", scale_canvas_mousemove, false);
  	scale_canvas.addEventListener("mouseup", scale_canvas_mouseup, false);
  	resize_scale();
  }
  
  var scale_canvas_drag_params={
  	mouse_down: false,
  	drag: false,
  	start_x: 0,
  	key_modifiers: {shiftKey:false, altKey: false, ctrlKey: false}
  };
  
  function scale_canvas_mousedown(evt)
  {
  	with(scale_canvas_drag_params)
  	{
  		mouse_down=true;
  		drag=false;
  		start_x=evt.pageX;
  		key_modifiers.shiftKey=evt.shiftKey;
  		key_modifiers.altKey=evt.altKey;
  		key_modifiers.ctrlKey=evt.ctrlKey;
  	}
  	evt.preventDefault();
  }
  
  function scale_offset_freq_from_px(x, visible_range)
  {
  	if(typeof visible_range === "undefined") visible_range=get_visible_freq_range();
  	return (visible_range.start+visible_range.bw*(x/canvas_container.clientWidth))-center_freq;
  }
  
  function scale_canvas_mousemove(evt)
  {
  	var event_handled;
  	if(scale_canvas_drag_params.mouse_down&&!scale_canvas_drag_params.drag&&Math.abs(evt.pageX-scale_canvas_drag_params.start_x)>canvas_drag_min_delta)
  	//we can use the main drag_min_delta thing of the main canvas
  	{
  		scale_canvas_drag_params.drag=true;
  		//call the drag_start for all demodulators (and they will decide if they're dragged, based on X coordinate)
  		for (var i=0;i<demodulators.length;i++) event_handled|=demodulators[i].envelope.drag_start(evt.pageX,scale_canvas_drag_params.key_modifiers);
  		scale_canvas.style.cursor="move";
  	}
  	else if(scale_canvas_drag_params.drag)
  	{
  		//call the drag_move for all demodulators (and they will decide if they're dragged)
  		for (var i=0;i<demodulators.length;i++) event_handled|=demodulators[i].envelope.drag_move(evt.pageX);
  		if (!event_handled) demodulator_set_offset_frequency(0,scale_offset_freq_from_px(evt.pageX));
  	}
  
  }
  
  function scale_canvas_end_drag(x)
  {
  	canvas_container.style.cursor="default";
  	scale_canvas_drag_params.drag=false;
  	scale_canvas_drag_params.mouse_down=false;
  	var event_handled=false;
  	for (var i=0;i<demodulators.length;i++) event_handled|=demodulators[i].envelope.drag_end(x);
  	//console.log(event_handled);
  	if (!event_handled) demodulator_set_offset_frequency(0,scale_offset_freq_from_px(x));
  }
  
  function scale_canvas_mouseup(evt)
  {
  	scale_canvas_end_drag(evt.pageX);
  }
  
  function scale_px_from_freq(f,range) { return Math.round(((f-range.start)/range.bw)*canvas_container.clientWidth); }
  
  function get_visible_freq_range()
  {
  	out={};
  	fcalc=function(x) { return Math.round(((-zoom_offset_px+x)/canvases[0].clientWidth)*bandwidth)+(center_freq-bandwidth/2); }
  	out.start=fcalc(0);
  	out.center=fcalc(canvas_container.clientWidth/2);
  	out.end=fcalc(canvas_container.clientWidth);
  	out.bw=out.end-out.start;
  	out.hps=out.bw/canvas_container.clientWidth;
  	return out;
  }
  
  var scale_markers_levels=[
  	{
  		"large_marker_per_hz":10000000, //large
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":0
  	},
  	{
  		"large_marker_per_hz":5000000,
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":0
  	},
  	{
  		"large_marker_per_hz":1000000,
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":0
  	},
  	{
  		"large_marker_per_hz":500000,
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":1
  	},
  	{
  		"large_marker_per_hz":100000,
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":1
  	},
  	{
  		"large_marker_per_hz":50000,
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":2
  	},
  	{
  		"large_marker_per_hz":10000,
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":2
  	},
  	{
  		"large_marker_per_hz":5000,
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":3
  	},
  	{
  		"large_marker_per_hz":1000,
  		"estimated_text_width":70,
  		"format":"{x} MHz",
  		"pre_divide":1000000,
  		"decimals":1
  	}
  ];
  var scale_min_space_bw_texts=50;
  var scale_min_space_bw_small_markers=7;
  
  function get_scale_mark_spacing(range)
  {
  	out={};
  	fcalc=function(freq)
  	{
  		out.numlarge=(range.bw/freq);
  		out.large=canvas_container.clientWidth/out.numlarge; 	//distance between large markers (these have text)
  		out.ratio=5; 														//(ratio-1) small markers exist per large marker
  		out.small=out.large/out.ratio; 								//distance between small markers
  		if(out.small<scale_min_space_bw_small_markers) return false;
  		if(out.small/2>=scale_min_space_bw_small_markers&&freq.toString()[0]!="5") {out.small/=2; out.ratio*=2; }
  		out.smallbw=freq/out.ratio;
  		return true;
  	}
  	for(i=scale_markers_levels.length-1;i>=0;i--)
  	{
  		mp=scale_markers_levels[i];
  		if (!fcalc(mp.large_marker_per_hz)) continue;
  		//console.log(mp.large_marker_per_hz);
  		//console.log(out);
  		if (out.large-mp.estimated_text_width>scale_min_space_bw_texts) break;
  	}
  	out.params=mp;
  	return out;
  }
  
  function mkscale()
  {
  	//clear the lower part of the canvas (where frequency scale resides; the upper part is used by filter envelopes):
  	range=get_visible_freq_range();
  	mkenvelopes(range); //when scale changes we will always have to redraw filter envelopes, too
  	scale_ctx.clearRect(0,22,scale_ctx.canvas.width,scale_ctx.canvas.height-22);
  	scale_ctx.strokeStyle = "#fff";
  	scale_ctx.font = "bold 11px sans-serif";
  	scale_ctx.textBaseline = "top";
  	scale_ctx.fillStyle = "#fff";
  	spacing=get_scale_mark_spacing(range);
  	//console.log(spacing);
  	marker_hz=Math.ceil(range.start/spacing.smallbw)*spacing.smallbw;
  	text_h_pos=22+10+((is_firefox)?3:0);
  	var text_to_draw;
  	var ftext=function(f) {text_to_draw=format_frequency(spacing.params.format,f,spacing.params.pre_divide,spacing.params.decimals);}
  	var last_large;
  	for(;;)
  	{
  		var x=scale_px_from_freq(marker_hz,range);
  		if(x>window.innerWidth) break;
  		scale_ctx.beginPath();
  		scale_ctx.moveTo(x, 22);
  		if(marker_hz%spacing.params.large_marker_per_hz==0)
  		{  //large marker
  			if(typeof first_large == "undefined") var first_large=marker_hz;
  			last_large=marker_hz;
  			scale_ctx.lineWidth=3.5;
  			scale_ctx.lineTo(x,22+11);
  			ftext(marker_hz);
  			var text_measured=scale_ctx.measureText(text_to_draw);
  			scale_ctx.textAlign = "center";
  			//advanced text drawing begins
  			if( zoom_level==0 && (range.start+spacing.smallbw*spacing.ratio>marker_hz) && (x<text_measured.width/2) )
  			{ //if this is the first overall marker when zoomed out...                  and if it would be clipped off the screen...
  				if(scale_px_from_freq(marker_hz+spacing.smallbw*spacing.ratio,range)-text_measured.width>=scale_min_space_bw_texts)
  				{ //and if we have enough space to draw it correctly without clipping
  					scale_ctx.textAlign = "left";
  					scale_ctx.fillText(text_to_draw, 0, text_h_pos);
  				}
  			}
  			else if( zoom_level==0 && (range.end-spacing.smallbw*spacing.ratio<marker_hz) && (x>window.innerWidth-text_measured.width/2) )
  			{ //     if this is the last overall marker when zoomed out...                 and if it would be clipped off the screen...
  				if(window.innerWidth-text_measured.width-scale_px_from_freq(marker_hz-spacing.smallbw*spacing.ratio,range)>=scale_min_space_bw_texts)
  				{ //and if we have enough space to draw it correctly without clipping
  					scale_ctx.textAlign = "right";
  					scale_ctx.fillText(text_to_draw, window.innerWidth, text_h_pos);
  				}
  			}
  			else scale_ctx.fillText(text_to_draw, x, text_h_pos); //draw text normally
  		}
  		else
  		{  //small marker
  			scale_ctx.lineWidth=2;
  			scale_ctx.lineTo(x,22+8);
  		}
  		marker_hz+=spacing.smallbw;
  		scale_ctx.stroke();
  	}
  	if(zoom_level!=0)
  	{ // if zoomed, we don't want the texts to disappear because their markers can't be seen
  		// on the left side
  		scale_ctx.textAlign = "center";
  		var f=first_large-spacing.smallbw*spacing.ratio;
  		var x=scale_px_from_freq(f,range);
  		ftext(f);
  		var w=scale_ctx.measureText(text_to_draw).width;
  		if(x+w/2>0) scale_ctx.fillText(text_to_draw, x, 22+10);
  		// on the right side
  		f=last_large+spacing.smallbw*spacing.ratio;
  		x=scale_px_from_freq(f,range);
  		ftext(f);
  		w=scale_ctx.measureText(text_to_draw).width;
  		if(x-w/2<window.innerWidth) scale_ctx.fillText(text_to_draw, x, 22+10);
  	}
  }
  
  function resize_scale()
  {
  	scale_ctx.canvas.width  = window.innerWidth;
  	scale_ctx.canvas.height = 47;
  	mkscale();
  }
  
  function canvas_mouseover(evt)
  {
  	if(!waterfall_setup_done) return;
  	//e("webrx-freq-show").style.visibility="visible";
  }
  
  function canvas_mouseout(evt)
  {
  	if(!waterfall_setup_done) return;
  	//e("webrx-freq-show").style.visibility="hidden";
  }
  
  function canvas_get_freq_offset(relativeX)
  {
  	rel=(relativeX/canvases[0].clientWidth);
  	return Math.round((bandwidth*rel)-(bandwidth/2));
  }
  
  function canvas_get_frequency(relativeX)
  {
  	return center_freq+canvas_get_freq_offset(relativeX);
  }
  
  /*function canvas_format_frequency(relativeX)
  {
  	return (canvas_get_frequency(relativeX)/1e6).toFixed(3)+" MHz";
  }*/
  
  function format_frequency(format, freq_hz, pre_divide, decimals)
  {
  	out=format.replace("{x}",(freq_hz/pre_divide).toFixed(decimals));
  	at=out.indexOf(".")+4;
  	while(decimals>3)
  	{
  		out=out.substr(0,at)+","+out.substr(at);
  		at+=4;
  		decimals-=3;
  	}
  	return out;
  }
  
  canvas_drag=false;
  canvas_drag_min_delta=1;
  canvas_mouse_down=false;
  
  function canvas_mousedown(evt)
  {
  	canvas_mouse_down=true;
  	canvas_drag=false;
  	canvas_drag_last_x=canvas_drag_start_x=evt.pageX;
  	canvas_drag_last_y=canvas_drag_start_y=evt.pageY;
  	evt.preventDefault(); //don't show text selection mouse pointer
  }
  
  function canvas_mousemove(evt)
  {
  	if(!waterfall_setup_done) return;
  	//element=e("webrx-freq-show");
  	relativeX=(evt.offsetX)?evt.offsetX:evt.layerX;
  	/*realX=(relativeX-element.clientWidth/2);
  	maxX=(canvases[0].clientWidth-element.clientWidth);
  	if(realX>maxX) realX=maxX;
  	if(realX<0) realX=0;
  	element.style.left=realX.toString()+"px";*/
  	if(canvas_mouse_down)
  	{
  		if(!canvas_drag&&Math.abs(evt.pageX-canvas_drag_start_x)>canvas_drag_min_delta)
  		{
  			canvas_drag=true;
  			canvas_container.style.cursor="move";
  		}
  		if(canvas_drag)
  		{
  			var deltaX=canvas_drag_last_x-evt.pageX;
  			var deltaY=canvas_drag_last_y-evt.pageY;
  			//zoom_center_where=zoom_center_where_calc(evt.pageX);
  			var dpx=range.hps*deltaX;
  			if(
  				!(zoom_center_rel+dpx>(bandwidth/2-canvas_container.clientWidth*(1-zoom_center_where)*range.hps)) &&
  				!(zoom_center_rel+dpx<-bandwidth/2+canvas_container.clientWidth*zoom_center_where*range.hps)
  			) { zoom_center_rel+=dpx; }
  //			-((canvases_new_width*(0.5+zoom_center_rel/bandwidth))-(winsize*zoom_center_where));
  			resize_canvases(false);
  			canvas_drag_last_x=evt.pageX;
  			canvas_drag_last_y=evt.pageY;
  			mkscale();
  		}
  	}
  	else e("webrx-mouse-freq").innerHTML=format_frequency("{x} MHz",canvas_get_frequency(relativeX),1e6,4);
  }
  
  function canvas_container_mouseout(evt)
  {
  	canvas_end_drag();
  }
  
  //function body_mouseup() { canvas_end_drag(); console.log("body_mouseup"); }
  //function window_mouseout() { canvas_end_drag(); console.log("document_mouseout"); }
  
  function canvas_mouseup(evt)
  {
  	if(!waterfall_setup_done) return;
  	relativeX=(evt.offsetX)?evt.offsetX:evt.layerX;
  
  	if(!canvas_drag)
  	{
  		//ws.send("SET offset_freq="+canvas_get_freq_offset(relativeX).toString());
  		demodulator_set_offset_frequency(0, canvas_get_freq_offset(relativeX));
  		e("webrx-actual-freq").innerHTML=format_frequency("{x} MHz",canvas_get_frequency(relativeX),1e6,4);
  	}
  	else
  	{
  		canvas_end_drag();
  	}
  	canvas_mouse_down=false;
  }
  
  function canvas_end_drag()
  {
  	canvas_container.style.cursor="crosshair";
  	canvas_mouse_down=false;
  }
  
  function zoom_center_where_calc(screenposX)
  {
  	//return (screenposX-(window.innerWidth-canvas_container.clientWidth))/canvas_container.clientWidth;
  	return screenposX/canvas_container.clientWidth;
  }
  
  function canvas_mousewheel(evt)
  {
  	if(!waterfall_setup_done) return;
  	//var i=Math.abs(evt.wheelDelta);
  	//var dir=(i/evt.wheelDelta)<0;
  	//console.log(evt);
  	var relativeX=(evt.offsetX)?evt.offsetX:evt.layerX;
  	var dir=(evt.deltaY/Math.abs(evt.deltaY))>0;
  	//console.log(dir);
  	//i/=120;
  	/*while (i--)*/ zoom_step(dir, relativeX, zoom_center_where_calc(evt.pageX));
  	evt.preventDefault();
  	//evt.returnValue = false; //disable scrollbar move
  }
  
  
  zoom_max_level_hps=33; //Hz/pixel
  zoom_levels_count=14;
  
  function get_zoom_coeff_from_hps(hps)
  {
  	var shown_bw=(window.innerWidth*hps);
  	return bandwidth/shown_bw;
  }
  
  zoom_levels=[1];
  zoom_level=0;
  zoom_freq=0;
  zoom_offset_px=0;
  zoom_center_rel=0;
  zoom_center_where=0;
  
  smeter_level=0;
  
  function mkzoomlevels()
  {
  	zoom_levels=[1];
  	maxc=get_zoom_coeff_from_hps(zoom_max_level_hps);
  	if(maxc<1) return;
  	// logarithmic interpolation
  	zoom_ratio = Math.pow(maxc, 1/zoom_levels_count);
  	for(i=1;i<zoom_levels_count;i++)
  		zoom_levels.push(Math.pow(zoom_ratio, i));
  }
  
  function zoom_step(out, where, onscreen)
  {
  	if((out&&zoom_level==0)||(!out&&zoom_level>=zoom_levels_count-1)) return;
  	if(out) --zoom_level;
  	else ++zoom_level;
  
  	zoom_center_rel=canvas_get_freq_offset(where);
  	//console.log("zoom_step || zlevel: "+zoom_level.toString()+" zlevel_val: "+zoom_levels[zoom_level].toString()+" zoom_center_rel: "+zoom_center_rel.toString());
  	zoom_center_where=onscreen;
  	//console.log(zoom_center_where, zoom_center_rel, where);
  	resize_canvases(true);
  	mkscale();
  }
  
  function zoom_set(level)
  {
  	if(!(level>=0&&level<=zoom_levels.length-1)) return;
  	level=parseInt(level);
  	zoom_level = level;
  	//zoom_center_rel=canvas_get_freq_offset(-canvases[0].offsetLeft+canvas_container.clientWidth/2); //zoom to screen center instead of demod envelope
  	zoom_center_rel=demodulators[0].offset_frequency;
  	zoom_center_where=0.5+(zoom_center_rel/bandwidth); //this is a kind of hack
  	console.log(zoom_center_where, zoom_center_rel, -canvases[0].offsetLeft+canvas_container.clientWidth/2);
  	resize_canvases(true);
  	mkscale();
  }
  
  function zoom_calc()
  {
  	winsize=canvas_container.clientWidth;
  	var canvases_new_width=winsize*zoom_levels[zoom_level];
  	zoom_offset_px=-((canvases_new_width*(0.5+zoom_center_rel/bandwidth))-(winsize*zoom_center_where));
  	if(zoom_offset_px>0) zoom_offset_px=0;
  	if(zoom_offset_px<winsize-canvases_new_width)
  		zoom_offset_px=winsize-canvases_new_width;
  	//console.log("zoom_calc || zopx:"+zoom_offset_px.toString()+ " maxoff:"+(winsize-canvases_new_width).toString()+" relval:"+(0.5+zoom_center_rel/bandwidth).toString() );
  }
  
  function resize_waterfall_container(check_init)
  {
  	if(check_init&&!waterfall_setup_done) return;
  	var numHeight;
  	mathbox_container.style.height=canvas_container.style.height=(numHeight=window.innerHeight-e("webrx-top-container").clientHeight-e("openwebrx-scale-container").clientHeight).toString()+"px";
  	if(mathbox)
  	{
  		//mathbox.three.camera.aspect = document.body.offsetWidth / numHeight;
    		//mathbox.three.camera.updateProjectionMatrix();
  		mathbox.three.renderer.setSize(document.body.offsetWidth, numHeight);
  		console.log(document.body.offsetWidth, numHeight);
  	}
  
  }
  
  audio_server_output_rate=11025;
  audio_client_resampling_factor=4;
  
  
  function audio_calculate_resampling(targetRate)
  { //both at the server and the client
  	output_range_max = 12000;
  	output_range_min = 8000;
  	i = 1;
  	while(true)
  	{
  		audio_server_output_rate = Math.floor(targetRate / i);
  		if(audio_server_output_rate < output_range_min)
  		{
  			audio_client_resampling_factor = audio_server_output_rate = 0;
  			divlog("Your audio card sampling rate ("+targetRate.toString()+") is not supported.<br />Please change your operating system default settings in order to fix this.",1);
  		}
  		if(audio_server_output_rate >= output_range_min	&& audio_server_output_rate <= output_range_max) break; //okay, we're done
  		i++;
  	}
  	audio_client_resampling_factor=i;
  	console.log("audio_calculate_resampling() :: "+audio_client_resampling_factor.toString()+", "+audio_server_output_rate.toString());
  }
  
  
  debug_ws_data_received=0;
  max_clients_num=0;
  
  var COMPRESS_FFT_PAD_N=10; //should be the same as in csdr.c
  
  function on_ws_recv(evt)
  {
  	if(!(evt.data instanceof ArrayBuffer)) { divlog("on_ws_recv(): Not ArrayBuffer received...",1); return; }
  	//
  	debug_ws_data_received+=evt.data.byteLength/1000;
  	first4Chars=getFirstChars(evt.data,4);
      first3Chars=first4Chars.slice(0,3);
  	if(first3Chars=="CLI")
  	{
  		var stringData=arrayBufferToString(evt.data);
  		if(stringData.substring(0,16)=="CLIENT DE SERVER") divlog("Server acknowledged WebSocket connection.");
  
  	}
  	if(first3Chars=="AUD")
  	{
  		var audio_data;
  		if(audio_compression=="adpcm") audio_data=new Uint8Array(evt.data,4)
  		else audio_data=new Int16Array(evt.data,4);
  		audio_prepare(audio_data);
  		audio_buffer_current_size_debug+=audio_data.length;
  		audio_buffer_all_size_debug+=audio_data.length;
  		if(!(ios||is_chrome) && (audio_initialized==0 && audio_prepared_buffers.length>audio_buffering_fill_to)) audio_init()
  	}
  	else if(first3Chars=="FFT")
  	{
  		//alert("Yupee! Doing FFT");
          //if(first4Chars=="FFTS") console.log("FFTS"); 
  		if(fft_compression=="none") waterfall_add_queue(new Float32Array(evt.data,4));
  		else if(fft_compression="adpcm")
  		{
  			fft_codec.reset();
  
  			var waterfall_i16=fft_codec.decode(new Uint8Array(evt.data,4));
  			var waterfall_f32=new Float32Array(waterfall_i16.length-COMPRESS_FFT_PAD_N);
  			for(var i=0;i<waterfall_i16.length;i++) waterfall_f32[i]=waterfall_i16[i+COMPRESS_FFT_PAD_N]/100;
              if(first4Chars=="FFTS") secondary_demod_waterfall_add_queue(waterfall_f32); //TODO digimodes
              else waterfall_add_queue(waterfall_f32);
  		}
  	} 
      else if(first3Chars=="DAT")
      {
          //secondary_demod_push_binary_data(new Uint8Array(evt.data,4));
          secondary_demod_push_data(arrayBufferToString(evt.data).substring(4));
          //console.log("DAT");
  	} 
      else if(first3Chars=="MSG")
  	{
  		/*try
  		{*/
  			var stringData=arrayBufferToString(evt.data);
  			params=stringData.substring(4).split(" ");
  			for(i=0;i<params.length;i++)
  			{
  				param=params[i].split("=");
  				switch(param[0])
  				{
  					case "setup":
  						waterfall_init();
  						audio_preinit();
  						break;
  					case "bandwidth":
  						bandwidth=parseInt(param[1]);
  						break;
  					case "center_freq":
  						center_freq=parseInt(param[1]); //there was no ; and it was no problem... why?
  						break;
  					case "fft_size":
  						fft_size=parseInt(param[1]);
  						break;
  					case "secondary_fft_size":
  						secondary_fft_size=parseInt(param[1]);
  						break;
                      case "secondary_setup":
                          secondary_demod_init_canvases();
                          break;
                      case "if_samp_rate":
                          if_samp_rate=parseInt(param[1]);
                          break;
                      case "secondary_bw":
                          secondary_bw=parseFloat(param[1]);
                          break;
  					case "fft_fps":
  						fft_fps=parseInt(param[1]);
  						break;
  					case "audio_compression":
  						audio_compression=param[1];
  						divlog( "Audio stream is "+ ((audio_compression=="adpcm")?"compressed":"uncompressed")+"." )
  						break;
  					case "fft_compression":
  						fft_compression=param[1];
  						divlog( "FFT stream is "+ ((fft_compression=="adpcm")?"compressed":"uncompressed")+"." )
  						break;
  					case "cpu_usage":
  						var server_cpu_usage=parseInt(param[1]);
  						progressbar_set(e("openwebrx-bar-server-cpu"),server_cpu_usage/100,"Server CPU ["+param[1]+"%]",server_cpu_usage>85);
  						break;
  					case "clients":
  						var clients_num=parseInt(param[1]);
  						progressbar_set(e("openwebrx-bar-clients"),clients_num/max_clients_num,"Clients ["+param[1]+"]",clients_num>max_clients_num*0.85);
  						break;
  					case "max_clients":
  						max_clients_num=parseInt(param[1]);
  						break;
  					case "s":
  						smeter_level=parseFloat(param[1]);
  						setSmeterAbsoluteValue(smeter_level);
  						break;
  				}
  			}
  		/*}
  		catch(err)
  		{
  			divlog("Received invalid message over WebSocket.");
  		}*/
  	}
  
  }
  
  function add_problem(what)
  {
  	problems_span=e("openwebrx-problems");
  	for(var i=0;i<problems_span.children.length;i++) if(problems_span.children[i].innerHTML==what) return;
  	new_span = document.createElement("span");
  	new_span.innerHTML=what;
  	problems_span.appendChild(new_span);
  	window.setTimeout(function(ps,ns) {  ps.removeChild(ns); }, 1000,problems_span,new_span);
  }
  
  waterfall_measure_minmax=false;
  waterfall_measure_minmax_now=false;
  waterfall_measure_minmax_min=1e100;
  waterfall_measure_minmax_max=-1e100;
  
  function waterfall_measure_minmax_do(what)
  {
  	waterfall_measure_minmax_min=Math.min(waterfall_measure_minmax_min,Math.min.apply(Math,what));
  	waterfall_measure_minmax_max=Math.max(waterfall_measure_minmax_max,Math.max.apply(Math,what));
  }
  
  function waterfall_measure_minmax_print()
  {
  	console.log("Waterfall | min = "+waterfall_measure_minmax_min.toString()+" dB | max = "+waterfall_measure_minmax_max.toString()+" dB");
  }
  
  function waterfall_add_queue(what)
  {
  	if(waterfall_measure_minmax) waterfall_measure_minmax_do(what);
  	if(waterfall_measure_minmax_now) { waterfall_measure_minmax_do(what); waterfall_measure_minmax_now=false; waterfallColorsAuto(); }
  	waterfall_queue.push(what);
  }
  
  function waterfall_dequeue()
  {
  	if(waterfall_queue.length) waterfall_add(waterfall_queue.shift());
  	if(waterfall_queue.length>Math.max(fft_fps/2,20)) //in case of emergency
  	{
  		console.log("waterfall queue length:", waterfall_queue.length);
  		add_problem("fft overflow");
  		while(waterfall_queue.length) waterfall_add(waterfall_queue.shift());
  	}
  }
  
  function on_ws_opened()
  {
  	ws.send("SERVER DE CLIENT openwebrx.js");
  	divlog("WebSocket opened to "+ws_url);
  }
  
  var was_error=0;
  
  function divlog(what, is_error)
  {
  	is_error=!!is_error;
  	was_error |= is_error;
  	if(is_error)
  	{
  		what="<span class=\"webrx-error\">"+what+"</span>";
  		if(e("openwebrx-panel-log").openwebrxHidden) toggle_panel("openwebrx-panel-log"); //show panel if any error is present
  	}
  	e("openwebrx-debugdiv").innerHTML+=what+"<br />";
  	//var wls=e("openwebrx-log-scroll");
  	//wls.scrollTop=wls.scrollHeight; //scroll to bottom
      $(".nano").nanoScroller();
      $(".nano").nanoScroller({ scroll: 'bottom' });
  }
  
  var audio_context;
  var audio_initialized=0;
  var volume = 1.0;
  var volumeBeforeMute = 100.0;
  var mute = false;
  
  var audio_received = Array();
  var audio_buffer_index = 0;
  var audio_resampler;
  var audio_codec=new sdrjs.ImaAdpcm();
  var audio_compression="unknown";
  var audio_node;
  //var audio_received_sample_rate = 48000;
  var audio_input_buffer_size;
  
  // Optimalise these if audio lags or is choppy:
  var audio_buffer_size;
  var audio_buffer_maximal_length_sec=3; //actual number of samples are calculated from sample rate
  var audio_buffer_decrease_to_on_overrun_sec=2.2;
  var audio_flush_interval_ms=500; //the interval in which audio_flush() is called
  
  var audio_prepared_buffers = Array();
  var audio_rebuffer;
  var audio_last_output_buffer;
  var audio_last_output_offset = 0;
  var audio_buffering = false;
  //var audio_buffering_fill_to=4; //on audio underrun we wait until this n*audio_buffer_size samples are present
  								//tnx to the hint from HA3FLT, now we have about half the response time! (original value: 10)
  
  function gain_ff(gain_value,data) //great! solved clicking! will have to move to sdr.js
  {
  	for(var i=0;i<data.length;i++)
  	data[i]*=gain_value;
  	return data;
  }
  
  function audio_prepare(data)
  {
  
  	//audio_rebuffer.push(sdrjs.ConvertI16_F(data));//no resampling
  	//audio_rebuffer.push(audio_resampler.process(sdrjs.ConvertI16_F(data)));//resampling without ADPCM
  	if(audio_compression=="none")
  		audio_rebuffer.push(audio_resampler.process(gain_ff(volume,sdrjs.ConvertI16_F(data))));//resampling without ADPCM
  	else if(audio_compression=="adpcm")
  		audio_rebuffer.push(audio_resampler.process(gain_ff(volume,sdrjs.ConvertI16_F(audio_codec.decode(data))))); //resampling & ADPCM
  	else return;
  
  	//console.log("prepare",data.length,audio_rebuffer.remaining());
  	while(audio_rebuffer.remaining())
  	{
  		audio_prepared_buffers.push(audio_rebuffer.take());
  		audio_buffer_current_count_debug++;
  	}
  	if(audio_buffering && audio_prepared_buffers.length>audio_buffering_fill_to) { console.log("buffers now: "+audio_prepared_buffers.length.toString()); audio_buffering=false; }
  }
  
  
  function audio_prepare_without_resampler(data)
  {
  	audio_rebuffer.push(sdrjs.ConvertI16_F(data));
  	console.log("prepare",data.length,audio_rebuffer.remaining());
  	while(audio_rebuffer.remaining())
  	{
  		audio_prepared_buffers.push(audio_rebuffer.take());
  		audio_buffer_current_count_debug++;
  	}
  	if(audio_buffering && audio_prepared_buffers.length>audio_buffering_fill_to) audio_buffering=false;
  }
  
  function audio_prepare_old(data)
  {
  	//console.log("audio_prepare :: "+data.length.toString());
  	//console.log("data.len = "+data.length.toString());
  	var dopush=function()
  	{
  		console.log(audio_last_output_buffer);
  		audio_prepared_buffers.push(audio_last_output_buffer);
  		audio_last_output_offset=0;
  		audio_last_output_buffer=new Float32Array(audio_buffer_size);
  		audio_buffer_current_count_debug++;
  	};
  
  	var original_data_length=data.length;
  	var f32data=new Float32Array(data.length);
  	for(var i=0;i<data.length;i++) f32data[i]=data[i]/32768; //convert_i16_f
  	data=audio_resampler.process(f32data);
  	console.log(data,data.length,original_data_length);
  	if(data.length==0) return;
  	if(audio_last_output_offset+data.length<=audio_buffer_size)
  	{	//array fits into output buffer
  		for(var i=0;i<data.length;i++) audio_last_output_buffer[i+audio_last_output_offset]=data[i];
  		audio_last_output_offset+=data.length;
  		console.log("fits into; offset="+audio_last_output_offset.toString());
  		if(audio_last_output_offset==audio_buffer_size) dopush();
  	}
  	else
  	{	//array is larger than the remaining space in the output buffer
  		var copied=audio_buffer_size-audio_last_output_offset;
  		var remain=data.length-copied;
  		for(var i=0;i<audio_buffer_size-audio_last_output_offset;i++) //fill the remaining space in the output buffer
  			audio_last_output_buffer[i+audio_last_output_offset]=data[i];///32768;
  		dopush();//push the output buffer and create a new one
  		console.log("larger than; copied half: "+copied.toString()+", now at: "+audio_last_output_offset.toString());
  		for(var i=0;i<remain;i++) //copy the remaining input samples to the new output buffer
  			audio_last_output_buffer[i]=data[i+copied];///32768;
  		audio_last_output_offset+=remain;
  		console.log("larger than; remained: "+remain.toString()+", now at: "+audio_last_output_offset.toString());
  	}
  	if(audio_buffering && audio_prepared_buffers.length>audio_buffering_fill_to) audio_buffering=false;
  }
  
  if (!AudioBuffer.prototype.copyToChannel)
  { //Chrome 36 does not have it, Firefox does
  	AudioBuffer.prototype.copyToChannel=function(input,channel) //input is Float32Array
  	{
  		var cd=this.getChannelData(channel);
  		for(var i=0;i<input.length;i++) cd[i]=input[i];
  	}
  }
  
  function audio_onprocess(e)
  {
  	//console.log("audio onprocess");
  	if(audio_buffering) return;
  	if(audio_prepared_buffers.length==0) { audio_buffer_progressbar_update(); /*add_problem("audio underrun");*/ audio_buffering=true; }
  	else { e.outputBuffer.copyToChannel(audio_prepared_buffers.shift(),0); }
  }
  
  var audio_buffer_progressbar_update_disabled=false;
  
  var audio_buffer_total_average_level=0;
  var audio_buffer_total_average_level_length=0;
  var audio_overrun_cnt = 0;
  var audio_underrun_cnt = 0;
  
  function audio_buffer_progressbar_update()
  {
  	if(audio_buffer_progressbar_update_disabled) return;
  	var audio_buffer_value=(audio_prepared_buffers.length*audio_buffer_size)/audio_context.sampleRate;
  	audio_buffer_total_average_level_length++; audio_buffer_total_average_level=(audio_buffer_total_average_level*((audio_buffer_total_average_level_length-1)/audio_buffer_total_average_level_length))+(audio_buffer_value/audio_buffer_total_average_level_length);
  	var overrun=audio_buffer_value>audio_buffer_maximal_length_sec;
  	var underrun=audio_prepared_buffers.length==0;
  	var text="buffer";
  	if(overrun) { text="overrun"; console.log("audio overrun, "+(++audio_overrun_cnt).toString()); }
  	if(underrun) { text="underrun"; console.log("audio underrun, "+(++audio_underrun_cnt).toString()); }
  	if(overrun||underrun)
  	{
  		audio_buffer_progressbar_update_disabled=true;
  		window.setTimeout(function(){audio_buffer_progressbar_update_disabled=false; audio_buffer_progressbar_update();},1000);
  	}
  	progressbar_set(e("openwebrx-bar-audio-buffer"),(underrun)?1:audio_buffer_value/1.5,"Audio "+text+" ["+(audio_buffer_value).toFixed(1)+" s]",overrun||underrun||audio_buffer_value<0.25);
  }
  
  
  
  function audio_flush()
  {
  	flushed=false;
  	we_have_more_than=function(sec){ return sec*audio_context.sampleRate<audio_prepared_buffers.length*audio_buffer_size; }
  	if(we_have_more_than(audio_buffer_maximal_length_sec)) while(we_have_more_than(audio_buffer_decrease_to_on_overrun_sec))
  	{
  		if(!flushed) audio_buffer_progressbar_update();
  		flushed=true;
  		audio_prepared_buffers.shift();
  	}
  	//if(flushed) add_problem("audio overrun");
  }
  
  
  function audio_onprocess_notused(e)
  {
  	//https://github.com/0xfe/experiments/blob/master/www/tone/js/sinewave.js
  	if(audio_received.length==0)
  	{ add_problem("audio underrun"); return; }
  	output = e.outputBuffer.getChannelData(0);
  	int_buffer = audio_received[0];
  	read_remain = audio_buffer_size;
  	//audio_buffer_maximal_length=120;
  
  	obi=0; //output buffer index
  	debug_str=""
  	while(1)
  	{
  		if(int_buffer.length-audio_buffer_index>read_remain)
  		{
  			for (i=audio_buffer_index; i<audio_buffer_index+read_remain; i++)
  				output[obi++] = int_buffer[i]/32768;
  			//debug_str+="added whole ibl="+int_buffer.length.toString()+" abi="+audio_buffer_index.toString()+" "+(int_buffer.length-audio_buffer_index).toString()+">"+read_remain.toString()+" obi="+obi.toString()+"\n";
  			audio_buffer_index+=read_remain;
  			break;
  		}
  		else
  		{
  			for (i=audio_buffer_index; i<int_buffer.length; i++)
  				output[obi++] = int_buffer[i]/32768;
  			read_remain-=(int_buffer.length-audio_buffer_index);
  			audio_buffer_current_size-=audio_received[0].length;
  			/*if (audio_received.length>audio_buffer_maximal_length)
  			{
  				add_problem("audio overrun");
  				audio_received.splice(0,audio_received.length-audio_buffer_maximal_length);
  			}
  			else*/
  				audio_received.splice(0,1);
  			//debug_str+="added remain, remain="+read_remain.toString()+" abi="+audio_buffer_index.toString()+" alen="+int_buffer.length.toString()+" i="+i.toString()+" arecva="+audio_received.length.toString()+" obi="+obi.toString()+"\n";
  			audio_buffer_index = 0;
  			if(audio_received.length == 0 || read_remain == 0) return;
  			int_buffer = audio_received[0];
  		}
  	}
  	//debug_str+="obi="+obi.toString();
  	//alert(debug_str);
  }
  
  function audio_flush_notused()
  {
  	if (audio_buffer_current_size>audio_buffer_maximal_length_sec*audio_context.sampleRate)
  	{
  		add_problem("audio overrun");
  		console.log("audio_flush() :: size: "+audio_buffer_current_size.toString()+" allowed: "+(audio_buffer_maximal_length_sec*audio_context.sampleRate).toString());
  		while (audio_buffer_current_size>audio_buffer_maximal_length_sec*audio_context.sampleRate*0.5)
  		{
  			audio_buffer_current_size-=audio_received[0].length;
  			audio_received.splice(0,1);
  		}
  	}
  }
  
  function webrx_set_param(what, value)
  {
  	ws.send("SET "+what+"="+value.toString());
  }
  
  var starting_mute = false;
  
  function parsehash()
  {
  	if(h=window.location.hash)
  	{
  		h.substring(1).split(",").forEach(function(x){
  			harr=x.split("=");
  			//console.log(harr);
  			if(harr[0]=="mute") toggleMute();
  			else if(harr[0]=="mod") starting_mod = harr[1];
  			else if(harr[0]=="sql") 
  			{ 
  				e("openwebrx-panel-squelch").value=harr[1]; 
  				updateSquelch(); 
  			}
  			else if(harr[0]=="freq") 
  			{
  				console.log(parseInt(harr[1]));
  				console.log(center_freq);
  				starting_offset_frequency = parseInt(harr[1])-center_freq;
  			}
  		});
  
  	}
  }
  
  function audio_preinit()
  {
  	try
  	{
  		window.AudioContext = window.AudioContext||window.webkitAudioContext;
  		audio_context = new AudioContext();
  	}
  	catch(e)
  	{
  		divlog('Your browser does not support Web Audio API, which is required for WebRX to run. Please upgrade to a HTML5 compatible browser.', 1);
  		return;
  	}
  
  	if(audio_context.sampleRate<44100*2)
  		audio_buffer_size = 4096;
  	else if(audio_context.sampleRate>=44100*2 && audio_context.sampleRate<44100*4)
  		audio_buffer_size = 4096 * 2;
  	else if(audio_context.sampleRate>44100*4)
  		audio_buffer_size = 4096 * 4;
  
  	audio_rebuffer = new sdrjs.Rebuffer(audio_buffer_size,sdrjs.REBUFFER_FIXED);
  	audio_last_output_buffer = new Float32Array(audio_buffer_size);
  
  	//we send our setup packet
  	parsehash();
  
  	audio_calculate_resampling(audio_context.sampleRate);
  	audio_resampler = new sdrjs.RationalResamplerFF(audio_client_resampling_factor,1);
  	ws.send("SET output_rate="+audio_server_output_rate.toString()+" action=start"); //now we'll get AUD packets as well
  
  }
  
  function audio_init()
  {
      if(is_chrome) audio_context.resume()
  	if(starting_mute) toggleMute();
  
  	if(audio_client_resampling_factor==0) return; //if failed to find a valid resampling factor...
  
  	audio_debug_time_start=(new Date()).getTime();
  	audio_debug_time_last_start=audio_debug_time_start;
  
  	//https://github.com/0xfe/experiments/blob/master/www/tone/js/sinewave.js
  	audio_initialized=1; // only tell on_ws_recv() not to call it again
  
  
  	//on Chrome v36, createJavaScriptNode has been replaced by createScriptProcessor
  	createjsnode_function = (audio_context.createJavaScriptNode == undefined)?audio_context.createScriptProcessor.bind(audio_context):audio_context.createJavaScriptNode.bind(audio_context);
  	audio_node = createjsnode_function(audio_buffer_size, 0, 1);
  	audio_node.onaudioprocess = audio_onprocess;
  	audio_node.connect(audio_context.destination);
  	// --- Resampling ---
  	//https://github.com/grantgalitz/XAudioJS/blob/master/XAudioServer.js
  	//audio_resampler = new Resampler(audio_received_sample_rate, audio_context.sampleRate, 1, audio_buffer_size, true);
  	//audio_input_buffer_size = audio_buffer_size*(audio_received_sample_rate/audio_context.sampleRate);
  	webrx_set_param("audio_rate",audio_context.sampleRate); //Don't try to resample //TODO remove this
  
  	window.setInterval(audio_flush,audio_flush_interval_ms);
  	divlog('Web Audio API succesfully initialized, sample rate: '+audio_context.sampleRate.toString()+ " sps");
  	/*audio_source=audio_context.createBufferSource();
     audio_buffer = audio_context.createBuffer(xhr.response, false);
  	audio_source.buffer = buffer;
  	audio_source.noteOn(0);*/
  	demodulator_analog_replace(starting_mod);
  	if(starting_offset_frequency)
  	{
  		demodulators[0].offset_frequency = starting_offset_frequency;
  		e("webrx-actual-freq").innerHTML=format_frequency("{x} MHz",center_freq+starting_offset_frequency,1e6,4);
  		demodulators[0].set();
  		mkscale();
  	}
  
  	//hide log panel in a second (if user has not hidden it yet)
  	window.setTimeout(function(){
  		if(typeof e("openwebrx-panel-log").openwebrxHidden == "undefined" && !was_error)
  		{
  			toggle_panel("openwebrx-panel-log");
  			//animate(e("openwebrx-panel-log"),"opacity","",1,0,0.9,1000,60);
  			//window.setTimeout(function(){toggle_panel("openwebrx-panel-log");e("openwebrx-panel-log").style.opacity="1";},1200)
  		}
  	},2000);
  
  }
  
  function on_ws_closed()
  {
  	try
  	{
  		audio_node.disconnect();
  	}
  	catch (dont_care) {}
  	divlog("WebSocket has closed unexpectedly. Please reload the page.", 1);
  }
  
  function on_ws_error(event)
  {
  	divlog("WebSocket error.",1);
  }
  
  String.prototype.startswith=function(str){ return this.indexOf(str) == 0; }; //http://stackoverflow.com/questions/646628/how-to-check-if-a-string-startswith-another-string
  
  function open_websocket()
  {
  	//if(ws_url.startswith("ws://localhost:")&&window.location.hostname!="127.0.0.1"&&window.location.hostname!="localhost")
  	//{
  		//divlog("Server administrator should set <em>server_hostname</em> correctly, because it is left as <em>\"localhost\"</em>. Now guessing hostname from page URL.",1);
  		ws_url="ws://"+(window.location.origin.split("://")[1])+"/ws/"; //guess automatically -> now default behaviour
  	//}
  	if (!("WebSocket" in window))
  		divlog("Your browser does not support WebSocket, which is required for WebRX to run. Please upgrade to a HTML5 compatible browser.");
  	ws = new WebSocket(ws_url+client_id);
  	ws.onopen = on_ws_opened;
  	ws.onmessage = on_ws_recv;
  	ws.onclose = on_ws_closed;
  	ws.binaryType = "arraybuffer";
  	window.onbeforeunload = function() { //http://stackoverflow.com/questions/4812686/closing-websocket-correctly-html5-javascript
  		ws.onclose = function () {};
  		ws.close();
  	};
  	ws.onerror = on_ws_error;
  }
  
  function waterfall_mkcolor(db_value, waterfall_colors_arg)
  {
  	if(typeof waterfall_colors_arg === 'undefined') waterfall_colors_arg = waterfall_colors;
  	if(db_value<waterfall_min_level) db_value=waterfall_min_level;
  	if(db_value>waterfall_max_level) db_value=waterfall_max_level;
  	full_scale=waterfall_max_level-waterfall_min_level;
  	relative_value=db_value-waterfall_min_level;
  	value_percent=relative_value/full_scale;
  	percent_for_one_color=1/(waterfall_colors_arg.length-1);
  	index=Math.floor(value_percent/percent_for_one_color);
  	remain=(value_percent-percent_for_one_color*index)/percent_for_one_color;
  	return color_between(waterfall_colors_arg[index+1],waterfall_colors_arg[index],remain);
  }
  
  function color_between(first, second, percent)
  {
  	output=0;
  	for(i=0;i<4;i++)
  	{
  		add = ((((first&(0xff<<(i*8)))>>>0)*percent) + (((second&(0xff<<(i*8)))>>>0)*(1-percent))) & (0xff<<(i*8));
  		output |= add>>>0;
  	}
  	return output>>>0;
  }
  
  
  var canvas_context;
  var canvases = [];
  var canvas_default_height = 200;
  var canvas_container;
  var canvas_phantom;
  
  function add_canvas()
  {
  	var new_canvas = document.createElement("canvas");
  	new_canvas.width=fft_size;
  	new_canvas.height=canvas_default_height;
  	canvas_actual_line=canvas_default_height-1;
  	new_canvas.style.width=(canvas_container.clientWidth*zoom_levels[zoom_level]).toString()+"px";
  	new_canvas.style.left=zoom_offset_px.toString()+"px";
  	new_canvas.style.height=canvas_default_height.toString()+"px";
  	new_canvas.openwebrx_top=(-canvas_default_height+1);
  	new_canvas.style.top=new_canvas.openwebrx_top.toString()+"px";
  	canvas_context = new_canvas.getContext("2d");
  	canvas_container.appendChild(new_canvas);
  	new_canvas.addEventListener("mouseover", canvas_mouseover, false);
  	new_canvas.addEventListener("mouseout", canvas_mouseout, false);
  	new_canvas.addEventListener("mousemove", canvas_mousemove, false);
  	new_canvas.addEventListener("mouseup", canvas_mouseup, false);
  	new_canvas.addEventListener("mousedown", canvas_mousedown, false);
  	new_canvas.addEventListener("wheel",canvas_mousewheel, false);
  	canvases.push(new_canvas);
  }
  
  
  function init_canvas_container()
  {
  	canvas_container=e("webrx-canvas-container");
  	mathbox_container=e("openwebrx-mathbox-container");
  	canvas_container.addEventListener("mouseout",canvas_container_mouseout, false);
  	//window.addEventListener("mouseout",window_mouseout,false);
  	//document.body.addEventListener("mouseup",body_mouseup,false);
  	canvas_phantom=e("openwebrx-phantom-canvas");
  	canvas_phantom.addEventListener("mouseover", canvas_mouseover, false);
  	canvas_phantom.addEventListener("mouseout", canvas_mouseout, false);
  	canvas_phantom.addEventListener("mousemove", canvas_mousemove, false);
  	canvas_phantom.addEventListener("mouseup", canvas_mouseup, false);
  	canvas_phantom.addEventListener("mousedown", canvas_mousedown, false);
  	canvas_phantom.addEventListener("wheel",canvas_mousewheel, false);
  	canvas_phantom.style.width=canvas_container.clientWidth+"px";
  	add_canvas();
  }
  
  canvas_maxshift=0;
  
  function shift_canvases()
  {
  	canvases.forEach(function(p)
  	{
  		p.style.top=(p.openwebrx_top++).toString()+"px";
  	});
  	canvas_maxshift++;
  	if(canvas_container.clientHeight>canvas_maxshift)
  	{
  		canvas_phantom.style.top=canvas_maxshift.toString()+"px";
  		canvas_phantom.style.height=(canvas_container.clientHeight-canvas_maxshift).toString()+"px";
  		canvas_phantom.style.display="block";
  	}
  	else
  		canvas_phantom.style.display="none";
  
  
  	//canvas_container.style.height=(((canvases.length-1)*canvas_default_height)+(canvas_default_height-canvas_actual_line)).toString()+"px";
  	//canvas_container.style.height="100%";
  }
  
  function resize_canvases(zoom)
  {
  	if(typeof zoom == "undefined") zoom=false;
  	if(!zoom) mkzoomlevels();
  	zoom_calc();
  	new_width=(canvas_container.clientWidth*zoom_levels[zoom_level]).toString()+"px";
  	var zoom_value=zoom_offset_px.toString()+"px";
  	canvases.forEach(function(p)
  	{
  		p.style.width=new_width;
  		p.style.left=zoom_value;
  	});
  	canvas_phantom.style.width=new_width;
  	canvas_phantom.style.left=zoom_value;
  }
  
  function waterfall_init()
  {
  	init_canvas_container();
  	waterfall_timer = window.setInterval(()=>{waterfall_dequeue(); secondary_demod_waterfall_dequeue();},900/fft_fps);
  	resize_waterfall_container(false); /* then */ resize_canvases();
  	scale_setup();
  	mkzoomlevels();
  	waterfall_setup_done=1;
  }
  
  var waterfall_dont_scale=0;
  
  var mathbox_shift = function()
  {
  	if(mathbox_data_current_depth < mathbox_data_max_depth) mathbox_data_current_depth++;
  	if(mathbox_data_index+1>=mathbox_data_max_depth) mathbox_data_index = 0;
  	else mathbox_data_index++;
  	mathbox_data_global_index++;
  }
  
  var mathbox_clear_data = function()
  {
  	mathbox_data_index = 50;
  	mathbox_data_current_depth = 0;
  }
  
  //var mathbox_get_data_line = function(x) //x counts from 0 to mathbox_data_current_depth
  //{
  //	return (mathbox_data_max_depth + mathbox_data_index - mathbox_data_current_depth + x - 1) % mathbox_data_max_depth;
  //}
  //
  //var mathbox_data_index_valid = function(x) //x counts from 0 to mathbox_data_current_depth
  //{
  //	return x<mathbox_data_current_depth;
  //}
  
  var mathbox_get_data_line = function(x)
  {
  	return (mathbox_data_max_depth + mathbox_data_index + x - 1) % mathbox_data_max_depth;
  }
  
  var mathbox_data_index_valid = function(x)
  {
  	return x>mathbox_data_max_depth-mathbox_data_current_depth;
  }
  
  
  
  function waterfall_add(data)
  {
  	if(!waterfall_setup_done) return;
  	var w=fft_size;
  
  	//waterfall_shift();
  	// ==== do scaling if required ====
  	/*if(waterfall_dont_scale)
  	{
  		scaled=data;
  		for(i=scaled.length;i<w;i++) scaled[i]=-100;
  	}
  	else
  	{
  		if ((to-from)==w)
  		{
  			scaled=data;
  		}
  		else if ((to-from)<w)
  		{	//make line bigger
  			pixel_per_point=w/(to-from);
  			scaled=Array();
  			j=0;
  			remain=pixel_per_point;
  			for(i=0; i<w; i++)
  			{
  				//thiscolor=data[j]*(remain-floor(remain))+data[j+1]*(1-(remain-floor(remain)))
  				//nextcolor=data[j+1]*(remain-floor(remain))+data[j+2]*(1-(remain-floor(remain)))
  				if(remain>1)
  				{
  					scaled[i]=data[j]*(remain/pixel_per_point)+data[j+1]*((1-remain)/pixel_per_point);
  					remain--;
  				}
  				else
  				{
  					j++;
  					scaled[i]=data[j]*(remain/pixel_per_point)+data[j+1]*((1-remain)/pixel_per_point);
  					remain=pixel_per_point-(1-remain);
  				}
  			}
  
  		}
  		else
  		{  //make line smaller (linear decimation, moving average)
  			point_per_pixel=(to-from)/w;
  			scaled=Array();
  			j=0;
  			remain=point_per_pixel;
  			last_pixel=0;
  			for(i=from; i<to; i++)
  			{
  				if(remain>1)
  				{
  					last_pixel+=data[i];
  					remain--;
  				}
  				else
  				{
  					last_pixel+=data[i]*remain;
  					scaled[j++]=last_pixel/point_per_pixel;
  					last_pixel=data[i]*(1-remain);
  					remain=point_per_pixel-(1-remain); //?
  				}
  			}
  		}
  	}
  
  	//Add line to waterfall image
  	base=(h-1)*w*4;
  	for(x=0;x<w;x++)
  	{
  		color=waterfall_mkcolor(scaled[x]);
  		for(i=0;i<4;i++)
  			waterfall_image.data[base+x*4+i] = ((color>>>0)>>((3-i)*8))&0xff;
  	}*/
  
  	if(mathbox_mode==MATHBOX_MODES.WATERFALL)
  	{
  		//Handle mathbox
  		for(var i=0;i<fft_size;i++) mathbox_data[i+mathbox_data_index*fft_size]=data[i];
  		mathbox_shift();
  	}
  	else
  	{
  	//Add line to waterfall image
  	oneline_image = canvas_context.createImageData(w,1);
  	for(x=0;x<w;x++)
  	{
  		color=waterfall_mkcolor(data[x]);
  		for(i=0;i<4;i++)
  			oneline_image.data[x*4+i] = ((color>>>0)>>((3-i)*8))&0xff;
  	}
  
  	//Draw image
  	canvas_context.putImageData(oneline_image, 0, canvas_actual_line--);
  	shift_canvases();
  	if(canvas_actual_line<0) add_canvas();
  	}
  
  
  }
  
  /*
  function waterfall_shift()
  {
  	w=canvas.width;
  	h=canvas.height;
  	for(y=0; y<h-1; y++)
  	{
  		for(i=0; i<w*4; i++)
  			waterfall_image.data[y*w*4+i] = waterfall_image.data[(y+1)*w*4+i];
  	}
  }*/
  
  function check_top_bar_congestion()
  {
  	var rmf=function(x){ return x.offsetLeft+x.offsetWidth; };
  	var wet=e("webrx-rx-title");
  	var wed=e("webrx-rx-desc");
  	var rightmost=Math.max(rmf(wet),rmf(wed));
  	var tl=e("openwebrx-main-buttons");
  
  	[wet, wed].map(function(what) {
  		if(rmf(what)>tl.offsetLeft-20) what.style.opacity=what.style.opacity="0";
  		else wet.style.opacity=wed.style.opacity="1";
  	});
  
  }
  
  var MATHBOX_MODES =
  {
  	UNINITIALIZED: 0,
  	NONE: 1,
  	WATERFALL: 2,
  	CONSTELLATION: 3
  };
  var mathbox_mode = MATHBOX_MODES.UNINITIALIZED;
  var mathbox;
  var mathbox_element;
  
  function mathbox_init()
  {
  	//mathbox_waterfall_history_length is defined in the config
  	mathbox_data_max_depth = fft_fps * mathbox_waterfall_history_length; //how many lines can the buffer store
  	mathbox_data_current_depth = 0; //how many lines are in the buffer currently
  	mathbox_data_index = 0; //the index of the last empty line / the line to be overwritten
  	mathbox_data = new Float32Array(fft_size * mathbox_data_max_depth);
  	mathbox_data_global_index = 0;
  	mathbox_correction_for_z = 0;
  
  	mathbox = mathBox({
        plugins: ['core', 'controls', 'cursor', 'stats'],
        controls: { klass: THREE.OrbitControls },
      });
      three = mathbox.three;
      if(typeof three == "undefined") divlog("3D waterfall cannot be initialized because WebGL is not supported in your browser.", true);
  
      three.renderer.setClearColor(new THREE.Color(0x808080), 1.0);
  	mathbox_container.appendChild((mathbox_element=three.renderer.domElement));
      view = mathbox
      .set({
        scale: 1080,
        focus: 3,
      })
      .camera({
        proxy: true,
        position: [-2, 1, 3],
      })
      .cartesian({
        range: [[-1, 1], [0, 1], [0, 1]],
        scale: [2, 2/3, 1],
      });
  
      view.axis({
        axis: 1,
        width: 3,
  	  color: "#fff",
    });
      view.axis({
        axis: 2,
        width: 3,
  	  color: "#fff",
  	  //offset: [0, 0, 0],
    });
      view.axis({
        axis: 3,
        width: 3,
  	  color: "#fff",
    });
  
      view.grid({
        width: 2,
        opacity: 0.5,
        axes: [1, 3],
        zOrder: 1,
  	  color: "#fff",
      });
  
      //var remap = function (v) { return Math.sqrt(.5 + .5 * v); };
  
  
  	var remap = function(x,z,t)
  	{
  		var currentTimePos = mathbox_data_global_index/(fft_fps*1.0);
  		var realZAdd = (-(t-currentTimePos)/mathbox_waterfall_history_length);
  		var zAdd = realZAdd - mathbox_correction_for_z;
  		if(zAdd<-0.2 || zAdd>0.2) { mathbox_correction_for_z = realZAdd; }
  
  		var xIndex = Math.trunc(((x+1)/2.0)*fft_size); //x: frequency
  		var zIndex = Math.trunc(z*(mathbox_data_max_depth-1)); //z: time
  		var realZIndex = mathbox_get_data_line(zIndex);
  		if(!mathbox_data_index_valid(zIndex)) return {y: undefined, dBValue: undefined, zAdd: 0 };
  		//if(realZIndex>=(mathbox_data_max_depth-1)) console.log("realZIndexundef", realZIndex, zIndex);
  		var index = Math.trunc(xIndex + realZIndex * fft_size);
  		/*if(mathbox_data[index]==undefined) console.log("Undef", index, mathbox_data.length, zIndex,
  				realZIndex, mathbox_data_max_depth,
  				mathbox_data_current_depth, mathbox_data_index);*/
  		var dBValue = mathbox_data[index];
  		//y=1;
  		if(dBValue>waterfall_max_level) y = 1;
  		else if(dBValue<waterfall_min_level) y = 0;
  		else y = (dBValue-waterfall_min_level)/(waterfall_max_level-waterfall_min_level);
  		mathbox_dbg = { dbv: dBValue, indexval: index, mbd: mathbox_data.length, yval: y };
  		if(!y) y=0;
  		return {y: y, dBValue: dBValue, zAdd: zAdd};
  	}
  
      var points = view.area({
        expr: function (emit, x, z, i, j, t) {
  		var y;
  		remapResult=remap(x,z,t);
  		if((y=remapResult.y)==undefined) return;
          emit(x, y, z+remapResult.zAdd);
        },
        width:  mathbox_waterfall_frequency_resolution,
        height: mathbox_data_max_depth - 1,
        channels: 3,
        axes: [1, 3],
      });
  
      var colors = view.area({
        expr: function (emit, x, z, i, j, t) {
  		var dBValue;
  		if((dBValue=remap(x,z,t).dBValue)==undefined) return;
  		var color=waterfall_mkcolor(dBValue, mathbox_waterfall_colors);
          var b = (color&0xff)/255.0;
          var g = ((color&0xff00)>>8)/255.0;
          var r = ((color&0xff0000)>>16)/255.0;
          emit(r, g, b, 1.0);
        },
        width:  mathbox_waterfall_frequency_resolution,
        height: mathbox_data_max_depth - 1,
        channels: 4,
        axes: [1, 3],
      });
  
      view.surface({
        shaded: true,
        points: '<<',
        colors: '<',
        color: 0xFFFFFF,
      });
  
      view.surface({
        fill: false,
        lineX: false,
        lineY: false,
        points: '<<',
        colors: '<',
        color: 0xFFFFFF,
        width: 2,
        blending: 'add',
        opacity: .25,
        zBias: 5,
      });
  	mathbox_mode = MATHBOX_MODES.NONE;
  
  	//mathbox_element.style.width="100%";
  	//mathbox_element.style.height="100%";
  
  }
  
  function mathbox_toggle()
  {
  
  	if(mathbox_mode == MATHBOX_MODES.UNINITIALIZED) mathbox_init();
  	mathbox_mode = (mathbox_mode == MATHBOX_MODES.NONE) ? MATHBOX_MODES.WATERFALL : MATHBOX_MODES.NONE;
  	mathbox_container.style.display = (mathbox_mode == MATHBOX_MODES.WATERFALL) ? "block" : "none";
  	mathbox_clear_data();
  	waterfall_clear();
  }
  
  function waterfall_clear()
  {
  	while(canvases.length) //delete all canvases
  	{
  		var x=canvases.shift();
  		x.parentNode.removeChild(x);
  		delete x;
  	}
  	add_canvas();
  }
  
  function openwebrx_resize()
  {
  	resize_canvases();
  	resize_waterfall_container(true);
  	resize_scale();
  	check_top_bar_congestion();
  }
  
  function openwebrx_init()
  {
  	if(ios||is_chrome) e("openwebrx-big-grey").style.display="table-cell";
  	(opb=e("openwebrx-play-button-text")).style.marginTop=(window.innerHeight/2-opb.clientHeight/2).toString()+"px";
  	init_rx_photo();
  	open_websocket();
      secondary_demod_init();
  	place_panels(first_show_panel);
  	window.setTimeout(function(){window.setInterval(debug_audio,1000);},1000);
  	window.addEventListener("resize",openwebrx_resize);
  	check_top_bar_congestion();
  
  	//Synchronise volume with slider
  	updateVolume();
  	waterfallColorsDefault();
  }
  
  function iosPlayButtonClick()
  {
  	//On iOS, we can only start audio from a click or touch event.
  	audio_init();
  	e("openwebrx-big-grey").style.opacity=0;
  	window.setTimeout(function(){ e("openwebrx-big-grey").style.display="none"; },1100);
  }
  
  /*
  window.setInterval(function(){
  	sum=0;
  	for(i=0;i<audio_received.length;i++)
  		sum+=audio_received[i].length;
  	divlog("audio buffer bytes: "+sum);
  }, 2000);*/
  
  /*function email(what)
  {
  	//| http://stackoverflow.com/questions/617647/where-is-my-one-line-implementation-of-rot13-in-javascript-going-wrong
  	what=what.replace(/[a-zA-Z]/g,function(c){return String.fromCharCode((c<="Z"?90:122)>=(c=c.charCodeAt(0)+13)?c:c-26);});
  	window.location.href="mailto:"+what;
  }*/
  
  var rt = function (s,n) {return s.replace(/[a-zA-Z]/g,function(c){return String.fromCharCode((c<="Z"?90:122)>=(c=c.charCodeAt(0)+n)?c:c-26);});}
  var irt = function (s,n) {return s.replace(/[a-zA-Z]/g,function(c){return String.fromCharCode((c>="a"?97:65)<=(c=c.charCodeAt(0)-n)?c:c+26);});}
  var sendmail2 = function (s) { window.location.href="mailto:"+irt(s.replace("=",String.fromCharCode(0100)).replace("$","."),8); }
  
  var audio_debug_time_start=0;
  var audio_debug_time_last_start=0;
  
  function debug_audio()
  {
  	if(audio_debug_time_start==0) return; //audio_init has not been called
  	time_now=(new Date()).getTime();
  	audio_debug_time_since_last_call=(time_now-audio_debug_time_last_start)/1000;
  	audio_debug_time_last_start=time_now; //now
  	audio_debug_time_taken=(time_now-audio_debug_time_start)/1000;
  	kbps_mult=(audio_compression=="adpcm")?8:16;
  	//e("openwebrx-audio-sps").innerHTML=
  	//	((audio_compression=="adpcm")?"ADPCM compressed":"uncompressed")+" audio downlink:<br/> "+(audio_buffer_current_size_debug*kbps_mult/audio_debug_time_since_last_call).toFixed(0)+" kbps ("+
  	//	(audio_buffer_all_size_debug*kbps_mult/audio_debug_time_taken).toFixed(1)+" kbps avg.), feed at "+
  	//	((audio_buffer_current_count_debug*audio_buffer_size)/audio_debug_time_taken).toFixed(1)+" sps output";
  
  	var audio_speed_value=audio_buffer_current_size_debug*kbps_mult/audio_debug_time_since_last_call;
  	progressbar_set(e("openwebrx-bar-audio-speed"),audio_speed_value/500000,"Audio stream ["+(audio_speed_value/1000).toFixed(0)+" kbps]",false);
  
  	var audio_output_value=(audio_buffer_current_count_debug*audio_buffer_size)/audio_debug_time_taken;
  	progressbar_set(e("openwebrx-bar-audio-output"),audio_output_value/55000,"Audio output ["+(audio_output_value/1000).toFixed(1)+" ksps]",audio_output_value>55000||audio_output_value<10000);
  
  	audio_buffer_progressbar_update();
  
  	var network_speed_value=debug_ws_data_received/audio_debug_time_taken;
  	progressbar_set(e("openwebrx-bar-network-speed"),network_speed_value*8/2000,"Network usage ["+(network_speed_value*8).toFixed(1)+" kbps]",false);
  
  	audio_buffer_current_size_debug=0;
  
  	if(waterfall_measure_minmax) waterfall_measure_minmax_print();
  }
  
  // ========================================================
  // =======================  PANELS  =======================
  // ========================================================
  
  panel_margin=5.9;
  
  function pop_bottommost_panel(from)
  {
  	min_order=parseInt(from[0].dataset.panelOrder);
  	min_index=0;
  	for(i=0;i<from.length;i++)
  	{
  		actual_order=parseInt(from[i].dataset.panelOrder);
  		if(actual_order<min_order)
  		{
  			min_index=i;
  			min_order=actual_order;
  		}
  	}
  	to_return=from[min_index];
  	from.splice(min_index,1);
  	return to_return;
  }
  
  function toggle_panel(what, on)
  {
      var item=e(what);
      if(typeof on !== "undefined") 
      {
          if(item.openwebrxHidden && !on) return;
          if(!item.openwebrxHidden && on) return;
      }
  	if(item.openwebrxDisableClick) return;
  	item.style.transitionDuration="599ms";
  	item.style.transitionDelay="0ms";
  	if(!item.openwebrxHidden)
  	{
  		window.setTimeout(function(){item.openwebrxHidden=!item.openwebrxHidden; place_panels(); item.openwebrxDisableClick=false;},700);
  		item.style.transform="perspective( 599px ) rotateX( 90deg )";
  	}
  	else
  	{
  		item.openwebrxHidden=!item.openwebrxHidden; place_panels();
  	    window.setTimeout(function(){ item.openwebrxDisableClick=false;},700);
  		item.style.transform="perspective( 599px ) rotateX( 0deg )";
  	}
  	item.style.transitionDuration="0";
  
  	item.openwebrxDisableClick=true;
  
  }
  
  function first_show_panel(panel)
  {
  	panel.style.transitionDuration=0;
  	panel.style.transitionDelay=0;
  	rotx=(Math.random()>0.5)?-90:90;
  	roty=0;
  	if(Math.random()>0.5)
  	{
  		rottemp=rotx;
  		rotx=roty;
  		roty=rottemp;
  	}
  	if(rotx!=0 && Math.random()>0.5) rotx=270;
  	//console.log(rotx,roty);
  	transformString = "perspective( 599px ) rotateX( %1deg ) rotateY( %2deg )"
  		.replace("%1",rotx.toString()).replace("%2",roty.toString());
  	//console.log(transformString);
  	//console.log(panel);
  	panel.style.transform=transformString;
  	window.setTimeout(function() {
  		panel.style.transitionDuration="599ms";
  		panel.style.transitionDelay=(Math.floor(Math.random()*500)).toString()+"ms";
  		panel.style.transform="perspective( 599px ) rotateX( 0deg ) rotateY( 0deg )";
  		//panel.style.transitionDuration="0ms";
  		//panel.style.transitionDelay="0";
  	}, 1);
  }
  
  function place_panels(function_apply)
  {
  	if(function_apply == undefined) function_apply = function(x){};
  	var hoffset=0; //added this because the first panel should not have such great gap below
  	var left_col=[];
  	var right_col=[];
  	var plist=e("openwebrx-panels-container").children;
  	for(i=0;i<plist.length;i++)
  	{
  		c=plist[i];
  		if(c.className=="openwebrx-panel")
  		{
  			if(c.openwebrxHidden)
  			{
  				c.style.display="none";
  				continue;
  			}
  			c.style.display="block";
  			c.openwebrxPanelTransparent=(!!c.dataset.panelTransparent);
  			newSize=c.dataset.panelSize.split(",");
  			if (c.dataset.panelPos=="left") { left_col.push(c); }
  			else if(c.dataset.panelPos=="right") { right_col.push(c); }
  			c.style.width=newSize[0]+"px";
  			//c.style.height=newSize[1]+"px";
  			if(!c.openwebrxPanelTransparent) c.style.margin=panel_margin.toString()+"px";
  			else c.style.marginLeft=panel_margin.toString()+"px";
  			c.openwebrxPanelWidth=parseInt(newSize[0]);
  			c.openwebrxPanelHeight=parseInt(newSize[1]);
  		}
  	}
  
  	y=hoffset; //was y=0 before hoffset
  	while(left_col.length>0)
  	{
  		p=pop_bottommost_panel(left_col);
  		p.style.left="0px";
  		p.style.bottom=y.toString()+"px";
  		p.style.visibility="visible";
  		y+=p.openwebrxPanelHeight+((p.openwebrxPanelTransparent)?0:3)*panel_margin;
  		if(function_apply) function_apply(p);
          //console.log(p.id, y, p.openwebrxPanelTransparent);
  	}
  	y=hoffset;
  	while(right_col.length>0)
  	{
  		p=pop_bottommost_panel(right_col);
  		p.style.right=(e("webrx-canvas-container").offsetWidth-e("webrx-canvas-container").clientWidth).toString()+"px"; //get scrollbar width
  		p.style.bottom=y.toString()+"px";
  		p.style.visibility="visible";
          y+=p.openwebrxPanelHeight+((p.openwebrxPanelTransparent)?0:3)*panel_margin;
  		if(function_apply) function_apply(p);
  	}
  }
  
  function progressbar_set(obj,val,text,over)
  {
  	if (val<0.05) val=0;
  	if (val>1) val=1;
  	var innerBar=null;
  	var innerText=null;
  	for(var i=0;i<obj.children.length;i++)
  	{
  		if(obj.children[i].className=="openwebrx-progressbar-text") innerText=obj.children[i];
  		else if(obj.children[i].className=="openwebrx-progressbar-bar") innerBar=obj.children[i];
  	}
  	if(innerBar==null) return;
  	//.h: function animate(object,style_name,unit,from,to,accel,time_ms,fps,to_exec)
  	animate(innerBar,"width","px",innerBar.clientWidth,val*obj.clientWidth,0.7,700,60);
  	//innerBar.style.width=(val*100).toFixed(0)+"%";
  	innerBar.style.backgroundColor=(over)?"#ff6262":"#00aba6";
  	if(innerText==null) return;
  	innerText.innerHTML=text;
  }
  
  function demodulator_buttons_update()
  {
  	$(".openwebrx-demodulator-button").removeClass("highlighted");
      if(secondary_demod) $("#openwebrx-button-dig").addClass("highlighted");
      else switch(demodulators[0].subtype)
  	{
  	case "nfm":
  		$("#openwebrx-button-nfm").addClass("highlighted");
  		break;
  	case "am":
  		$("#openwebrx-button-am").addClass("highlighted");
  		break;
  	case "lsb":
  	case "usb":
  	case "cw":
  		if(demodulators[0].high_cut-demodulators[0].low_cut<300)
  			$("#openwebrx-button-cw").addClass("highlighted");
  		else
  		{
  			if(demodulators[0].high_cut<0) 
  				$("#openwebrx-button-lsb").addClass("highlighted");
  			else if(demodulators[0].low_cut>0) 
  				$("#openwebrx-button-usb").addClass("highlighted");
  			else $("#openwebrx-button-lsb, #openwebrx-button-usb").addClass("highlighted");
  		}
  		break;
  	}
  }
  function demodulator_analog_replace_last() { demodulator_analog_replace(last_analog_demodulator_subtype); }
  
  /*
    _____  _       _                     _           
   |  __ \(_)     (_)                   | |          
   | |  | |_  __ _ _ _ __ ___   ___   __| | ___  ___ 
   | |  | | |/ _` | | '_ ` _ \ / _ \ / _` |/ _ \/ __|
   | |__| | | (_| | | | | | | | (_) | (_| |  __/\__ \
   |_____/|_|\__, |_|_| |_| |_|\___/ \__,_|\___||___/
              __/ |                                  
             |___/                                   
  */
  
  secondary_demod = false;
  secondary_demod_offset_freq = 0;
  secondary_demod_waterfall_queue = [];
  
  function demodulator_digital_replace_last() 
  { 
      demodulator_digital_replace(last_digital_demodulator_subtype); 
      secondary_demod_listbox_update();
  }
  function demodulator_digital_replace(subtype)
  {
      switch(subtype) 
      {
      case "bpsk31":
      case "rtty":
          secondary_demod_start(subtype);
          demodulator_analog_replace('usb', true);
          demodulator_buttons_update();
          break;
      }
      toggle_panel("openwebrx-panel-digimodes", true);
  }
  
  function secondary_demod_create_canvas()
  {
  	var new_canvas = document.createElement("canvas");
  	new_canvas.width=secondary_fft_size;
  	new_canvas.height=$(secondary_demod_canvas_container).height();
  	new_canvas.style.width=$(secondary_demod_canvas_container).width()+"px";
  	new_canvas.style.height=$(secondary_demod_canvas_container).height()+"px";
      console.log(new_canvas.width, new_canvas.height, new_canvas.style.width, new_canvas.style.height);
  	secondary_demod_current_canvas_actual_line=new_canvas.height-1;
  	$(secondary_demod_canvas_container).children().last().before(new_canvas);
      return new_canvas;
  }
  
  function secondary_demod_remove_canvases()
  {
      $(secondary_demod_canvas_container).children("canvas").remove();
  }
  
  function secondary_demod_init_canvases()
  {
      secondary_demod_remove_canvases();
      secondary_demod_canvases=[];
      secondary_demod_canvases.push(secondary_demod_create_canvas());
      secondary_demod_canvases.push(secondary_demod_create_canvas());
      secondary_demod_canvases[0].openwebrx_top=-$(secondary_demod_canvas_container).height();
      secondary_demod_canvases[1].openwebrx_top=0;
      secondary_demod_canvases_update_top();
      secondary_demod_current_canvas_context = secondary_demod_canvases[0].getContext("2d");
      secondary_demod_current_canvas_actual_line=$(secondary_demod_canvas_container).height()-1;
      secondary_demod_current_canvas_index=0;
      secondary_demod_canvases_initialized=true;
      //secondary_demod_update_channel_freq_from_event();
      mkscale(); //so that the secondary waterfall zoom level will be initialized
  }
  
  function secondary_demod_canvases_update_top()
  {
      for(var i=0;i<2;i++) secondary_demod_canvases[i].style.top=secondary_demod_canvases[i].openwebrx_top+"px";
  }
  
  function secondary_demod_swap_canvases()
  {
      console.log("swap");
      secondary_demod_canvases[0+!secondary_demod_current_canvas_index].openwebrx_top-=$(secondary_demod_canvas_container).height()*2;
      secondary_demod_current_canvas_index=0+!secondary_demod_current_canvas_index;
      secondary_demod_current_canvas_context = secondary_demod_canvases[secondary_demod_current_canvas_index].getContext("2d");
      secondary_demod_current_canvas_actual_line=$(secondary_demod_canvas_container).height()-1;
  }
  
  function secondary_demod_init()
  {
      $("#openwebrx-panel-digimodes")[0].openwebrxHidden = true;
      secondary_demod_canvas_container = $("#openwebrx-digimode-canvas-container")[0];
      $(secondary_demod_canvas_container)
          .mousemove(secondary_demod_canvas_container_mousemove)
          .mouseup(secondary_demod_canvas_container_mouseup)
          .mousedown(secondary_demod_canvas_container_mousedown)
          .mouseenter(secondary_demod_canvas_container_mousein)
          .mouseleave(secondary_demod_canvas_container_mouseout);
  }
  
  function secondary_demod_start(subtype) 
  { 
      secondary_demod_canvases_initialized = false;
      ws.send("SET secondary_mod="+subtype); 
      secondary_demod = subtype; 
  }
  
  function secondary_demod_set()
  {
      ws.send("SET secondary_offset_freq="+secondary_demod_offset_freq.toString());
  }
  
  function secondary_demod_stop()
  {
      ws.send("SET secondary_mod=off");
      secondary_demod = false; 
      secondary_demod_waterfall_queue = [];
  }
  
  function secondary_demod_waterfall_add_queue(x)
  {
      secondary_demod_waterfall_queue.push(x);
  }
  
  function secondary_demod_push_binary_data(x)
  {
      secondary_demod_push_data(Array.from(x).map( y => (y)?"1":"0" ).join(""));
  }
  
  function secondary_demod_push_data(x)
  {
      x=Array.from(x).map((y)=>{
          var c=y.charCodeAt(0);
          if(y=="\r") return "&nbsp;";
          if(y=="\n") return "&nbsp;";
          //if(y=="\n") return "<br />";
          if(c<32||c>126) return "";
          if(y=="&") return "&amp;";
          if(y=="<") return "&lt;";
          if(y==">") return "&gt;";
          if(y==" ") return "&nbsp;";
          return y;
      }).join("");
      $("#openwebrx-cursor-blink").before("<span class=\"part\"><span class=\"subpart\">"+x+"</span></span>");
  }
  
  function secondary_demod_data_clear()
  {
      $("#openwebrx-cursor-blink").prevAll().remove();
  }
  
  function secondary_demod_close_window()
  {
      secondary_demod_stop();
      toggle_panel("openwebrx-panel-digimodes", false);
  }
  
  secondary_demod_fft_offset_db=30; //need to calculate that later
  
  function secondary_demod_waterfall_add(data)
  {
      if(!secondary_demod) return;
  	var w=secondary_fft_size;
  
  	//Add line to waterfall image
  	var oneline_image = secondary_demod_current_canvas_context.createImageData(w,1);
  	for(x=0;x<w;x++)
  	{
  		var color=waterfall_mkcolor(data[x]+secondary_demod_fft_offset_db);
  		for(i=0;i<4;i++) oneline_image.data[x*4+i] = ((color>>>0)>>((3-i)*8))&0xff;
  	}
  
  	//Draw image
  	secondary_demod_current_canvas_context.putImageData(oneline_image, 0, secondary_demod_current_canvas_actual_line--);
      secondary_demod_canvases.map((x)=>{x.openwebrx_top += 1;});
      secondary_demod_canvases_update_top();
  	if(secondary_demod_current_canvas_actual_line<0) secondary_demod_swap_canvases();
  }
  
  var secondary_demod_canvases_initialized = false;
  
  function secondary_demod_waterfall_dequeue()
  {
      if(!secondary_demod || !secondary_demod_canvases_initialized) return;
  	if(secondary_demod_waterfall_queue.length) secondary_demod_waterfall_add(secondary_demod_waterfall_queue.shift());
  	if(secondary_demod_waterfall_queue.length>Math.max(fft_fps/2,20)) //in case of fft overflow
  	{
  		console.log("secondary waterfall overflow, queue length:", secondary_demod_waterfall_queue.length);
  		while(secondary_demod_waterfall_queue.length) secondary_demod_waterfall_add(secondary_demod_waterfall_queue.shift());
  	}
  } 
  
  secondary_demod_listbox_updating = false;
  function secondary_demod_listbox_changed()
  {
      if(secondary_demod_listbox_updating) return;
      switch ($("#openwebrx-secondary-demod-listbox")[0].value)
      {
          case "none":
              demodulator_analog_replace_last();
              break;
          case "bpsk31":
              demodulator_digital_replace('bpsk31');
              break;
          case "rtty":
              demodulator_digital_replace('rtty');
              break;
      }
  }
  
  function secondary_demod_listbox_update()
  {
      secondary_demod_listbox_updating = true;
      $("#openwebrx-secondary-demod-listbox").val((secondary_demod)?secondary_demod:"none");
      console.log("update");
      secondary_demod_listbox_updating = false;
  }
  
  secondary_demod_channel_freq=1000;
  function secondary_demod_update_marker()
  {
      var width =  Math.max( (secondary_bw / (if_samp_rate/2)) * secondary_demod_canvas_width, 5);
      var center_at = (secondary_demod_channel_freq / (if_samp_rate/2)) * secondary_demod_canvas_width + secondary_demod_canvas_left;
      var left = center_at-width/2;
      //console.log("sdum", width, left);
      $("#openwebrx-digimode-select-channel").width(width).css("left",left+"px") 
  }
  
  secondary_demod_waiting_for_set = false;
  function secondary_demod_update_channel_freq_from_event(evt)
  {
      if(typeof evt !== "undefined")
      {
          var relativeX=(evt.offsetX)?evt.offsetX:evt.layerX;
          secondary_demod_channel_freq=secondary_demod_low_cut + 
              (relativeX/$(secondary_demod_canvas_container).width()) * (secondary_demod_high_cut-secondary_demod_low_cut);
      }
      //console.log("toset:", secondary_demod_channel_freq);
      if(!secondary_demod_waiting_for_set)
      {
          secondary_demod_waiting_for_set = true;
          window.setTimeout(()=>{
              ws.send("SET secondary_offset_freq="+Math.floor(secondary_demod_channel_freq));
              //console.log("doneset:", secondary_demod_channel_freq);
              secondary_demod_waiting_for_set = false;
          }, 50);
      }
      secondary_demod_update_marker();
  }
  
  secondary_demod_mousedown=false;
  function secondary_demod_canvas_container_mousein()
  {
      $("#openwebrx-digimode-select-channel").css("opacity","0.7"); //.css("border-width", "1px");
  }
  
  function secondary_demod_canvas_container_mouseout()
  {
      $("#openwebrx-digimode-select-channel").css("opacity","0");
  }
  
  function secondary_demod_canvas_container_mousemove(evt)
  {
      if(secondary_demod_mousedown) secondary_demod_update_channel_freq_from_event(evt);
  }
  
  function secondary_demod_canvas_container_mousedown(evt)
  {
      if(evt.which==1) secondary_demod_mousedown=true;
  }
  
  function secondary_demod_canvas_container_mouseup(evt)
  {
      if(evt.which==1) secondary_demod_mousedown=false;
      secondary_demod_update_channel_freq_from_event(evt);
  }
  
  
  function secondary_demod_waterfall_set_zoom(low_cut, high_cut)
  {
      if(!secondary_demod || !secondary_demod_canvases_initialized) return;
      if(low_cut<0 && high_cut<0)
      {
          var hctmp = high_cut;
          var lctmp = low_cut;
          low_cut = -hctmp;
          low_cut = -lctmp;
      }
      else if(low_cut<0 && high_cut>0)
      {
          high_cut=Math.max(Math.abs(high_cut), Math.abs(low_cut));
          low_cut=0;
      }
      secondary_demod_low_cut = low_cut;
      secondary_demod_high_cut = high_cut;
      var shown_bw = high_cut-low_cut;
      secondary_demod_canvas_width = $(secondary_demod_canvas_container).width()  * (if_samp_rate/2)/shown_bw;
      secondary_demod_canvas_left = -secondary_demod_canvas_width*(low_cut/(if_samp_rate/2));
      //console.log("setzoom", secondary_demod_canvas_width, secondary_demod_canvas_left, low_cut, high_cut);
      secondary_demod_canvases.map((x)=>{$(x).css("left",secondary_demod_canvas_left+"px").css("width",secondary_demod_canvas_width+"px");});
      secondary_demod_update_channel_freq_from_event();
  }
  