many fixes and new features like IMA ADPCM compression

2015-08-17 20:32:58 +02:00 · 2015-08-17 20:32:58 +02:00 · 0713f57bb4
commit 0713f57bb4
parent f388e80624
32 changed files with 12695 additions and 272 deletions
--- a/README.md
+++ b/README.md
@ -14,6 +14,14 @@ It has the following features:
 - it works in Google Chrome, Chromium (above version 37) and Mozilla Firefox (above version 28),
 - currently only supports RTL-SDR, but other SDR hardware may be easily added.

+**News:**
+- My BSc. thesis written on OpenWebRX is <a href="http://openwebrx.org/bsc-thesis.pdf">available here.</a>
+- Several bugs were fixed to improve reliability and stability.
+- OpenWebRX now supports compression of audio and waterfall stream, so the required network uplink bandwidth has been decreased from 2 Mbit/s to about 200 kbit/s per client! (Measured with the default settings. It is also dependent on `fft_size`.)
+- OpenWebRX now uses <a href="https://github.com/simonyiszk/csdr#sdr.js">sdr.js</a> (*libcsdr* compiled to JavaScript) for some client-side DSP tasks. 
+- Auto-update capability for <a href="http://sdr.hu/">sdr.hu</a> added (currently only <a href="http://sdr.hu/">sdr.hu</a> beta testers can use it).
+- License for OpenWebRX is now Affero GPL v3. 
+
 ## Setup

 OpenWebRX currently requires Linux and python 2.7 to run. 
--- a/config_rtl.py
+++ b/config_rtl.py
@ -1,20 +1,30 @@
 '''
-This file is part of RTL Multi-User Server, 
+	This file is part of RTL Multi-User Server, 
 	that makes multi-user access to your DVB-T dongle used as an SDR.
-Copyright (c) 2013-2014 by Andras Retzler <randras@sdr.hu>
+	Copyright (c) 2013-2015 by Andras Retzler <randras@sdr.hu>

-RTL Multi-User Server is free software: you can redistribute it and/or modify
-it under the terms of the GNU 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 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.

-RTL Multi-User Server 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 General Public License for more details.
+    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 General Public License
-along with RTL Multi-User Server.  If not, see <http://www.gnu.org/licenses/>.
+    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/>.
+
+	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+	In addition, as a special exception, the copyright holders
+	state that config_rtl.py and config_webrx.py are not part of the 
+	Corresponding Source defined in GNU AGPL version 3 section 1. 
+	
+	(It means that you do not have to redistribute config_rtl.py and 
+	config_webrx.py if you make any changes to these two configuration files,
+	and use them for running your own web service with OpenWebRX.)
 '''

 my_ip='127.0.0.1' # leave blank for listening on all interfaces
@ -70,11 +80,11 @@ Example DSP commands:
  * Decompress FLAC-coded I/Q data:
    flac --force-raw-format --decode --endian=little --sign=unsigned - -
 '''
-watchdog_interval=1.5
+watchdog_interval=0
 reconnect_interval=10 
 '''
 If there's no input I/Q data after N seconds, input will be filled with zero samples, 
-so that GNU Radio won't fail in openwebrx. It may reconnect rtl_tcp_tread. 
+so that GNU Radio won't fail in OpenWebRX. It may reconnect rtl_tcp_thread. 
 If watchdog_interval is 0, then watchdog thread is not started. 

 '''
@ -85,3 +95,9 @@ cache_full_behaviour=2
 	2 = openwebrx: don't care about that client until it wants samples again (gr-osmosdr bug workaround)
 '''

+rtl_tcp_password=None 
+'''
+This one applies to a special version of rtl_tcp that has authentication.
+# You can find more info here: https://github.com/ha7ilm/rtl-sdr
+# If it is set to a string (e.g. rtl_tcp_password="changeme"), rtl_mus will try to authenticate against the rtl_tcp server.
+'''
--- a/config_webrx.py
+++ b/config_webrx.py
@ -3,36 +3,46 @@
 """
 config_webrx: configuration options for OpenWebRX

-OpenWebRX (c) Copyright 2013-2014 Andras Retzler <randras@sdr.hu>
+	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 file is part of OpenWebRX.
+    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.

-    OpenWebRX is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    OpenWebRX is distributed in the hope that it will be useful,
+    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 General Public License for more details.
+    GNU Affero General Public License for more details.

-    You should have received a copy of the GNU General Public License
-    along with OpenWebRX.  If not, see <http://www.gnu.org/licenses/>.
+    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/>.

+	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+	In addition, as a special exception, the copyright holders
+	state that config_rtl.py and config_webrx.py are not part of the 
+	Corresponding Source defined in GNU AGPL version 3 section 1. 
+	
+	(It means that you do not have to redistribute config_rtl.py and 
+	config_webrx.py if you make any changes to these two configuration files,
+	and use them for running your web service with OpenWebRX.)
 """
-#Server settings
+# ==== Server settings ====
 web_port=8073
 server_hostname="localhost" # If this contains an incorrect value, the web UI may freeze on load (it can't open websocket)
+max_clients=20

-#Web GUI configuration
+# ==== Web GUI configuration ====
 receiver_name="[Callsign]"
 receiver_location="Budapest, Hungary"
 receiver_qra="JN97ML"
-receiver_asl=182
+receiver_asl=200
 receiver_ant="Longwire"
 receiver_device="RTL-SDR"
-receiver_admin="localhost@localhost"
+receiver_admin="example@example.com"
 receiver_gps=(47.000000,19.000000)
 photo_height=350
 photo_title="Panorama of Budapest from Schönherz Zoltán Dormitory"
@ -44,16 +54,57 @@ Antenna: %[RX_ANT]<br />
 Website: <a href="http://localhost" target="_blank">http://localhost</a>
 """

-#DSP/RX settings
+# ==== sdr.hu listing ====
+# (This feature is only available to sdr.hu beta testers by now.)
+# If you want your ham receiver to be listed publicly on sdr.hu, then take the following steps:
+# 1. Register at: http://sdr.hu/register
+# 2. You will get an unique key by email. Copy it and paste here:
+sdrhu_key = ""
+# 3. Set this setting to True to enable listing:
+sdrhu_public_listing = False
+
+# ==== DSP/RX settings ====
 dsp_plugin="csdr"
 fft_fps=9
 fft_size=4096
 samp_rate = 250000
+
 center_freq = 145525000
 rf_gain = 5
+ppm = 0 

-start_rtl_thread=True #rtl_sdr is more stable than rtl_tcp...
-start_rtl_command="rtl_sdr -s {samp_rate} -f {center_freq}  - | nc -vvl 127.0.0.1 -p 8888".format(rf_gain=rf_gain, center_freq=center_freq, samp_rate=samp_rate) 
-#start_rtl_tcp_command="rtl_tcp -s 250000 -f 145525000 -g 0 -p 8888"
-#You can use other SDR hardware as well, but if the command above outputs samples in a format other than [unsigned char], then the dsp plugin has to be slightly modified (at the csdr convert_u8_f part).
+audio_compression="adpcm" #valid values: "adpcm", "none" 
+fft_compression="adpcm" #valid values: "adpcm", "none" 

+start_rtl_thread=True 
+
+# ==== I/Q sources (uncomment the appropriate) ====
+
+# >> RTL-SDR via rtl_sdr 
+
+start_rtl_command="rtl_sdr -s {samp_rate} -f {center_freq} -p {ppm} - | nc -vvl 127.0.0.1 8888".format(rf_gain=rf_gain, center_freq=center_freq, samp_rate=samp_rate, ppm=ppm)
+format_conversion="csdr convert_u8_f"
+
+# >> Sound card SDR (needs ALSA)
+#I did not have the chance to properly test it.
+#samp_rate = 96000
+#start_rtl_command="arecord -f S16_LE -r {samp_rate} -c2 - | nc -vvl 127.0.0.1 8888".format(samp_rate=samp_rate)
+#format_conversion="csdr convert_i16_f | csdr gain_ff 30"
+
+# >> RTL_SDR via rtl_tcp
+#start_rtl_command="rtl_tcp -s {samp_rate} -f {center_freq} -g {rf_gain} -P {ppm} -p 8888".format(rf_gain=rf_gain, center_freq=center_freq, samp_rate=samp_rate, ppm=ppm)
+#format_conversion="csdr convert_u8_f"
+
+# >> /dev/urandom test signal source
+#samp_rate = 2400000
+#start_rtl_command="cat /dev/urandom | (pv -qL `python -c 'print int({samp_rate} * 2.2)'` 2>&1) | nc -vvl 127.0.0.1  8888".format(rf_gain=rf_gain, center_freq=center_freq, samp_rate=samp_rate)
+#format_conversion="csdr convert_u8_f"
+
+#You can use other SDR hardware as well, by giving your own command that outputs the I/Q samples...
+
+shown_center_freq = center_freq #you can change this if you use an upconverter
+
+client_audio_buffer_size = 4 
+#increasing client_audio_buffer_size will:
+# - also increase the latency 
+# - decrease the chance of audio underruns
--- a/htdocs/gfx/openwebrx-avatar-background.png
+++ b/htdocs/gfx/openwebrx-avatar-background.png
--- a/htdocs/gfx/openwebrx-avatar.png
+++ b/htdocs/gfx/openwebrx-avatar.png
--- a/htdocs/gfx/openwebrx-background-cool-blue.png
+++ b/htdocs/gfx/openwebrx-background-cool-blue.png
--- a/htdocs/gfx/openwebrx-background-lingrad.png
+++ b/htdocs/gfx/openwebrx-background-lingrad.png
--- a/htdocs/gfx/openwebrx-ha5kfu-top-logo.png
+++ b/htdocs/gfx/openwebrx-ha5kfu-top-logo.png
--- a/htdocs/gfx/openwebrx-logo-big.png
+++ b/htdocs/gfx/openwebrx-logo-big.png
--- a/htdocs/gfx/openwebrx-panel-log.png
+++ b/htdocs/gfx/openwebrx-panel-log.png
--- a/htdocs/gfx/openwebrx-panel-receiver.png
+++ b/htdocs/gfx/openwebrx-panel-receiver.png
--- a/htdocs/gfx/openwebrx-panel-status.png
+++ b/htdocs/gfx/openwebrx-panel-status.png
--- a/htdocs/gfx/openwebrx-rx-details-arrow-up.png
+++ b/htdocs/gfx/openwebrx-rx-details-arrow-up.png
--- a/htdocs/gfx/openwebrx-rx-details-arrow.png
+++ b/htdocs/gfx/openwebrx-rx-details-arrow.png
--- a/htdocs/gfx/openwebrx-scale-background.png
+++ b/htdocs/gfx/openwebrx-scale-background.png
--- a/htdocs/gfx/openwebrx-top-logo.png
+++ b/htdocs/gfx/openwebrx-top-logo.png
--- a/htdocs/gfx/openwebrx-top-photo.jpg
+++ b/htdocs/gfx/openwebrx-top-photo.jpg
--- a/htdocs/index.wrx
+++ b/htdocs/index.wrx
@ -1,31 +1,35 @@
 <!DOCTYPE HTML>
 <!--
-OpenWebRX (c) Copyright 2013-2014 Andras Retzler <randras@sdr.hu>

-This file is part of OpenWebRX.
+	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>

-    OpenWebRX is free software: you can redistribute it and/or modify
-    it under the terms of the GNU 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 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.

-    OpenWebRX is distributed in the hope that it will be useful,
+    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 General Public License for more details.
+    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/>.

-    You should have received a copy of the GNU General Public License
-    along with OpenWebRX. If not, see <http://www.gnu.org/licenses/>.
 -->
 <html>
 	<head>
-		<title>OpenWebRX | Open Source Web-based SDR for everyone!</title>
+		<title>OpenWebRX | Open Source SDR Web App for Everyone!</title>
 		<script type="text/javascript">
 			//Local variables
 			client_id="%[CLIENT_ID]";
 			ws_url="%[WS_URL]";
 			rx_photo_height=%[RX_PHOTO_HEIGHT];
+			var audio_buffering_fill_to=%[AUDIO_BUFSIZE];
 		</script>
+		<script src="sdr.js"></script>
 		<script src="openwebrx.js"></script>
 		<link rel="stylesheet" type="text/css" href="openwebrx.css" />
 		<meta charset="utf-8">
@ -50,6 +54,13 @@ This file is part of OpenWebRX.
 				<a id="openwebrx-rx-details-arrow-up" onclick="toggle_rx_photo();"><img src="gfx/openwebrx-rx-details-arrow-up.png" /></a>
 				<a id="openwebrx-rx-details-arrow-down" onclick="toggle_rx_photo();"><img src="gfx/openwebrx-rx-details-arrow.png" /></a>
 			</div>
+			<section id="openwebrx-main-buttons">
+				<ul>
+					<li onmouseup="toggle_panel('openwebrx-panel-status');"><img src="gfx/openwebrx-panel-status.png" /><br/>Status</li>
+					<li onmouseup="toggle_panel('openwebrx-panel-log');"><img  src="gfx/openwebrx-panel-log.png" /><br/>Log</li>
+					<li onmouseup="toggle_panel('openwebrx-panel-receiver');"><img src="gfx/openwebrx-panel-receiver.png" /><br/>Receiver</li>
+				</ul>
+			</section>
 		</div>
 	</div>
 	<div id="webrx-main-container">
@ -61,7 +72,7 @@ This file is part of OpenWebRX.
 				<!-- add canvas here by javascript -->
 			</div>
 			<div id="openwebrx-panels-container">
-				<div class="openwebrx-panel" data-panel-name="client-params" data-panel-pos="right" data-panel-order="0" data-panel-size="215,70">
+				<div class="openwebrx-panel" id="openwebrx-panel-receiver" data-panel-name="client-params" data-panel-pos="right" data-panel-order="0" data-panel-size="215,70">
 					<div id="webrx-actual-freq">---.--- MHz</div>
 					<div id="webrx-mouse-freq">---.--- MHz</div>
 					<!--<div class="openwebrx-button" onclick="ws.send('SET mod=wfm');" >WFM</div>-->
@ -71,17 +82,23 @@ This file is part of OpenWebRX.
 					<div class="openwebrx-button" onclick="demodulator_analog_replace('usb');">USB</div>
 					<div class="openwebrx-button" onclick="demodulator_analog_replace('cw');">CW</div>
 				</div>
-				<div class="openwebrx-panel" id="webrx-config" data-panel-name="debug" data-panel-pos="left" data-panel-order="0" data-panel-size="585,130">
-					<div class="openwebrx-panel-inner">
-						<div id="openwebrx-client-log-title">openwebrx.js (beta) client log </strong><span id="openwebrx-problems"></span></div>
+				<div class="openwebrx-panel" id="openwebrx-panel-log" data-panel-name="debug" data-panel-pos="left" data-panel-order="1" data-panel-size="619,142">
+					<div class="openwebrx-panel-inner" id="openwebrx-log-scroll">
+						<div id="openwebrx-client-log-title">OpenWebRX (beta) client log<span style="color: #ff5900;"></span> </strong><span id="openwebrx-problems"></span></div>
 						Author: <a href="javascript:sendmail2('pi7qtu=alz$pc');">HA7ILM</a>. Please send me bug reports and suggestions.<br/>
-						Client status: <span id="openwebrx-client-status">
-							<span id="openwebrx-audio-sps"></span><br/>
 						<!--Server status: <span id="openwebrx-server-status">no information</span><br/>-->
 						Your client ID is: <em>%[CLIENT_ID]</em><br />
 						<div id="openwebrx-debugdiv"></div>
 					</div>
 				</div>
+				<div class="openwebrx-panel" id="openwebrx-panel-status" data-panel-name="status" data-panel-pos="left" data-panel-order="0" data-panel-size="615,50" data-panel-transparent="true">
+					<div class="openwebrx-progressbar" id="openwebrx-bar-audio-buffer"> <span class="openwebrx-progressbar-text">Audio buffer [0 ms]</span><div class="openwebrx-progressbar-bar"></div></div>
+					<div class="openwebrx-progressbar" id="openwebrx-bar-audio-output"> <span class="openwebrx-progressbar-text">Audio output [0 sps]</span><div class="openwebrx-progressbar-bar"></div></div>
+					<div class="openwebrx-progressbar" id="openwebrx-bar-audio-speed"> <span class="openwebrx-progressbar-text">Audio stream [0 kbps]</span><div class="openwebrx-progressbar-bar"></div></div>
+					<div class="openwebrx-progressbar" id="openwebrx-bar-network-speed"> <span class="openwebrx-progressbar-text">Network speed [0 kbps]</span><div class="openwebrx-progressbar-bar"></div></div>
+					<div class="openwebrx-progressbar" id="openwebrx-bar-server-cpu"> <span class="openwebrx-progressbar-text">Server CPU [0%]</span><div class="openwebrx-progressbar-bar"></div></div>
+					<div class="openwebrx-progressbar" id="openwebrx-bar-clients"> <span class="openwebrx-progressbar-text">Clients [1]</span><div class="openwebrx-progressbar-bar"></div></div>
+				</div>
 				<div class="openwebrx-panel" data-panel-name="client-under-devel" data-panel-pos="none" data-panel-order="0" data-panel-size="245,55" style="background-color: Red;">
 					<span style="font-size: 15pt; font-weight: bold;">Under construction</span>
 					<br />We're working on the code right now, so the application might fail.
--- a/htdocs/openwebrx.css
+++ b/htdocs/openwebrx.css
@ -1,20 +1,22 @@
 /*
-OpenWebRX (c) Copyright 2013-2014 Andras Retzler <randras@sdr.hu>

-This file is part of OpenWebRX.
+	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>

-    OpenWebRX is free software: you can redistribute it and/or modify
-    it under the terms of the GNU 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 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.

-    OpenWebRX is distributed in the hope that it will be useful,
+    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 General Public License for more details.
+    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/>.

-    You should have received a copy of the GNU General Public License
-    along with OpenWebRX. If not, see <http://www.gnu.org/licenses/>.
 */

 html, body
@ -52,9 +54,14 @@ html, body
 {
 	margin:0;
 	padding:0;
+	user-select: none;
+    -webkit-touch-callout: none;
+    -webkit-user-select: none;
+    -khtml-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
 }

-
 #webrx-top-logo
 {
 	position: absolute;
@ -65,7 +72,7 @@ html, body
 #webrx-ha5kfu-top-logo
 {
 	position: absolute;
-	top: 19px;
+	top: 15px;
 	right: 15px;
 }

@ -177,8 +184,10 @@ html, body

 #webrx-rx-photo-desc a
 {
+	/*color: #007df1;*/
 	color: #5ca8ff;
 	text-shadow: none;
+	/*text-shadow: 0px 0px 7px #fff;*/
 }

 #webrx-rx-title
@ -269,6 +278,8 @@ html, body
 {
 	position: absolute;
 	border-style: none;
+	image-rendering: crisp-edges;
+	image-rendering: -webkit-optimize-contrast;
 }

 #openwebrx-phantom-canvas
@ -410,6 +421,12 @@ html, body
 	cursor: pointer;
 	background:-webkit-gradient( linear, left top, left bottom, color-stop(0.0	, #373737), color-stop(1, #4F4F4F) );
 	background:-moz-linear-gradient( center top, #373737 0%, #4F4F4F 100% );
+	user-select: none;
+    -webkit-touch-callout: none;
+    -webkit-user-select: none;
+    -khtml-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
 }

 .openwebrx-button:hover
@ -431,3 +448,94 @@ html, body
 	margin-bottom: 5px;
 	font-weight: bold;
 }
+
+.openwebrx-progressbar
+{
+	position: relative;
+	border-radius: 5px;
+	background-color: #003850; /*#006235;*/
+	display: inline-block;
+	text-align: center;
+	font-size: 8pt;
+	font-weight: bold;
+	text-shadow: 0px 0px 4px #000000;
+	cursor: default;
+	user-select: none;
+    -webkit-touch-callout: none;
+    -webkit-user-select: none;
+    -khtml-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+}
+
+.openwebrx-progressbar-bar
+{
+	border-radius: 5px;
+	height: 100%;
+	width: 100%;
+}
+
+.openwebrx-progressbar-text
+{
+	position: absolute;
+	left:0px;
+	top:4px;
+	width: inherit;
+}
+
+#openwebrx-panel-status
+{
+	margin: 0px;
+	padding: 0px;
+	background-color:rgba(0, 0, 0, 0);
+}
+
+#openwebrx-panel-status div.openwebrx-progressbar
+{
+	width: 200px;
+	height: 20px;
+}
+
+#openwebrx-main-buttons img
+{
+}
+
+#openwebrx-main-buttons ul
+{
+	display: table;
+	margin:0;
+}
+
+
+#openwebrx-main-buttons ul li
+{
+	display: table-cell;
+	padding-left: 5px;
+	padding-right: 5px;
+	cursor:pointer;	
+}
+
+#openwebrx-main-buttons li:hover
+{
+	background-color: rgba(255, 255, 255, 0.3);
+}
+
+#openwebrx-main-buttons li:active
+{
+	background-color: rgba(255, 255, 255, 0.55);
+}
+
+
+#openwebrx-main-buttons
+{
+	position: absolute;
+	right: 133px;
+	top: 3px;
+	margin:0;
+	color: white;
+	text-shadow: 0px 0px 4px #000000;
+	text-align: center;
+	font-size: 9pt;
+	font-weight: bold;
+}
+
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@ -1,21 +1,23 @@
 /*

-OpenWebRX (c) Copyright 2013-2014 Andras Retzler <randras@sdr.hu>
+	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 file is part of OpenWebRX.
+    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.

-    OpenWebRX is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    OpenWebRX is distributed in the hope that it will be useful,
+    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 General Public License for more details.
+    GNU Affero General Public License for more details.

-    You should have received a copy of the GNU General Public License
-    along with OpenWebRX. If not, see <http://www.gnu.org/licenses/>.
+    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/>.
+
+"""

 */

@ -43,6 +45,9 @@ 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;
@ -270,7 +275,7 @@ demodulator.draggable_ranges={none: 0, beginning:1 /*from*/, ending: 2 /*to*/, a
 // 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=100; 
+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)
@ -703,26 +708,20 @@ function mkscale()
 			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)
-			{ //if this is the first overall marker when zoomed out
-				if(x<text_measured.width/2)
-				{ //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); 
-					}
+			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)  
-			{ //if this is the last overall marker when zoomed out
-				if(x>window.innerWidth-text_measured.width/2) 
-				{ //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 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
@ -960,11 +959,16 @@ function resize_waterfall_container(check_init)
 	canvas_container.style.height=(window.innerHeight-e("webrx-top-container").clientHeight-e("openwebrx-scale-container").clientHeight).toString()+"px";
 }

+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;
 	firstChars=getFirstChars(evt.data,3);
 	if(firstChars=="CLI")
 	{
@ -973,7 +977,9 @@ function on_ws_recv(evt)
 	}
 	if(firstChars=="AUD")
 	{
-		var audio_data=new Int16Array(evt.data,4);
+		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;
@ -982,8 +988,15 @@ function on_ws_recv(evt)
 	else if(firstChars=="FFT")
 	{
 		//alert("Yupee! Doing FFT");
-		var floatArray = new Float32Array(evt.data,4);
-		waterfall_add_queue(floatArray);
+		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;
+			waterfall_add_queue(waterfall_f32);
+		}
 	} else if(firstChars=="MSG")
 	{
 		/*try
@ -999,18 +1012,36 @@ function on_ws_recv(evt)
 						waterfall_init();
 						break;					
 					case "bandwidth":
-						bandwidth=parseInt(param[1])
+						bandwidth=parseInt(param[1]);
 						break;		
 					case "center_freq":
-						center_freq=parseInt(param[1])
+						center_freq=parseInt(param[1]); //there was no ; and it was no problem... why?
 						break;
 					case "fft_size":
-						fft_size=parseInt(param[1])
+						fft_size=parseInt(param[1]);
 						break;
 					case "fft_fps":
-						fft_fps=parseInt(param[1])
+						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;
-
 				}
 			}
 		/*}
@ -1032,17 +1063,33 @@ function add_problem(what)
 	window.setTimeout(function(ps,ns) {  ps.removeChild(ns); }, 1000,problems_span,new_span);
 }

+waterfall_measure_minmax=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);
 	waterfall_queue.push(what);
 }

 function waterfall_dequeue()
 {
 	if(waterfall_queue.length) waterfall_add(waterfall_queue.shift());
-	if(waterfall_queue.length>Math.max(fft_fps/2,8)) //in case of emergency 
+	if(waterfall_queue.length>Math.max(fft_fps/2,20)) //in case of emergency 
 	{
-		console.log(waterfall_queue.length);
+		console.log("waterfall queue length:", waterfall_queue.length);
 		add_problem("fft overflow");
 		while(waterfall_queue.length) waterfall_add(waterfall_queue.shift());
 	}
@ -1054,10 +1101,20 @@ function on_ws_opened()
 	divlog("WebSocket opened to "+ws_url);
 }

+var was_error=0;
+
 function divlog(what, is_error)
 {
-	if(typeof is_error !== undefined && is_error == 1) what="<span class=\"webrx-error\">"+what+"</span>";
+	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
 }

 var audio_context;
@ -1065,40 +1122,91 @@ var audio_initialized=0;

 var audio_received = Array();
 var audio_buffer_index = 0;
-var audio_resampler;
+var audio_resampler=new sdrjs.RationalResamplerFF(4,1);
+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 = 8192;//2048 was choppy
-var audio_buffer_maximal_length_sec=1.7; //actual number of samples are calculated from sample rate
-var audio_flush_interval_ms=250; //the interval in which audio_flush() is called
+var audio_buffer_size = 4096;//2048 was choppy
+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 = new sdrjs.Rebuffer(audio_buffer_size,sdrjs.REBUFFER_FIXED);
 var audio_last_output_buffer = new Float32Array(audio_buffer_size);
 var audio_last_output_offset = 0;
 var audio_buffering = false;
-var audio_buffering_fill_to=10; //on audio underrun we wait until this n*audio_buffer_size samples are present
+//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(0.9,sdrjs.ConvertI16_F(data))));//resampling without ADPCM
+	else if(audio_compression=="adpcm")
+		audio_rebuffer.push(audio_resampler.process(gain_ff(0.9,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) 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]/32768;
+		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());
+		console.log("fits into; offset="+audio_last_output_offset.toString());
 		if(audio_last_output_offset==audio_buffer_size) dopush();
 	}
 	else
@ -1106,13 +1214,13 @@ function audio_prepare(data)
 		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;
+			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());
+		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_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());
+		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;
 }
@ -1128,23 +1236,48 @@ if (!AudioBuffer.prototype.copyToChannel)

 function audio_onprocess(e)
 {
+	//console.log("audio onprocess");
 	if(audio_buffering) return;
-	if(audio_prepared_buffers.length==0) { add_problem("audio underrun"); audio_buffering=true; }
-	else e.outputBuffer.copyToChannel(audio_prepared_buffers.shift(),0);
+	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;
+
+function audio_buffer_progressbar_update()
+{
+	if(audio_buffer_progressbar_update_disabled) return;
+	var audio_buffer_value=(audio_prepared_buffers.length*audio_buffer_size)/44100;
+	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";
+	if(underrun) text="underrun";
+	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;
-	while(audio_buffer_maximal_length_sec*audio_context.sampleRate<audio_prepared_buffers.length*audio_buffer_size)
+	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");
+	//if(flushed) add_problem("audio overrun");
 }


@ -1238,7 +1371,8 @@ function audio_init()
 	//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
+	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();
@ -1246,6 +1380,14 @@ function audio_init()
 	audio_source.buffer = buffer;
 	audio_source.noteOn(0);*/
 	demodulator_analog_replace('nfm'); //needs audio_context.sampleRate to exist
+	//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)
+		{
+			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)
+		}
+	},1000);
 }

 function on_ws_closed()
@ -1267,11 +1409,11 @@ String.prototype.startswith=function(str){ return this.indexOf(str) == 0; }; //h

 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
-	}
+	//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);
@ -1293,14 +1435,16 @@ function open_websocket()
 //var color_scale=[ 0x000000FF, 0xff5656ff, 0xffffffff];

 //2014-04-22
-var color_scale=[0x2e6893ff, 0x69a5d0ff, 0x214b69ff, 0x9dc4e0ff,  0xfff775ff, 0xff8a8aff, 0xb20000ff];
+var color_scale=[0x000000ff,0x2e6893ff, 0x69a5d0ff, 0x214b69ff, 0x9dc4e0ff,  0xfff775ff, 0xff8a8aff, 0xb20000ff]
+//2015-04-10
+//var color_scale=[0x112634ff,0x4991c6ff,0x18364cff,0x9dc4e0ff,0xfff775ff,0xff9f60,0xff4d4dff,0x8d0000ff];

 function waterfall_mkcolor(db_value)
 {
-	min_value=-100; //in dB
-	max_value=10
-	if(db_value<min_value) db_value=min_value
-	if(db_value>max_value) db_value=max_value
+	min_value=-115; //in dB
+	max_value=0;
+	if(db_value<min_value) db_value=min_value;
+	if(db_value>max_value) db_value=max_value;
 	full_scale=max_value-min_value;
 	relative_value=db_value-min_value;
 	value_percent=relative_value/full_scale;
@ -1508,6 +1652,7 @@ function waterfall_add(data)
 	canvas_context.putImageData(oneline_image, 0, canvas_actual_line--);
 	shift_canvases();
 	if(canvas_actual_line<0) add_canvas();
+	
 	//divlog("Drawn FFT");
 }

@ -1525,10 +1670,17 @@ function waterfall_shift()

 function check_top_bar_congestion()
 {
-	var wt=e("webrx-rx-title");
-	var tl=e("webrx-ha5kfu-top-logo");
-	if(wt.offsetLeft+wt.offsetWidth>tl.offsetLeft-20) tl.style.display="none";
-	else tl.style.display="block";
+	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";
+	});
+
 }

 function openwebrx_resize() 
@ -1546,6 +1698,7 @@ function openwebrx_init()
 	place_panels();
 	window.setTimeout(function(){window.setInterval(debug_audio,1000);},1000);
 	window.addEventListener("resize",openwebrx_resize);
+	check_top_bar_congestion();
 }

 /*
@ -1577,18 +1730,33 @@ function debug_audio()
 	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;
-	e("openwebrx-audio-sps").innerHTML=
-		"audio recv. at "+(audio_buffer_current_size_debug/audio_debug_time_since_last_call).toFixed(0)+" sps ("+
-		(audio_buffer_all_size_debug/audio_debug_time_taken).toFixed(1)+" sps avg.), feed at "+
-		((audio_buffer_current_count_debug*audio_buffer_size)/audio_debug_time_taken).toFixed(1)+" sps output";
+	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=10;
+panel_margin=5.9;

 function pop_bottommost_panel(from)
 {
@ -1608,8 +1776,19 @@ function pop_bottommost_panel(from)
 	return to_return;
 }

+function toggle_panel(what)
+{
+	var item=e(what);
+	if(item.openwebrxDisableClick) return;
+	item.openwebrxHidden=!item.openwebrxHidden;
+	place_panels();
+	item.openwebrxDisableClick=true;
+	window.setTimeout(function(){item.openwebrxDisableClick=false;},100);
+}
+
 function place_panels()
 {
+	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;
@ -1618,33 +1797,61 @@ function place_panels()
 		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";
-			c.style.margin=panel_margin.toString()+"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=0;
+	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+3*panel_margin;
+		y+=p.openwebrxPanelHeight+((p.openwebrxPanelTransparent)?0:3)*panel_margin;
 	}
-	y=0;
+	y=hoffset;
 	while(right_col.length>0)
 	{
 		p=pop_bottommost_panel(right_col);
-		p.style.right="10px";
+		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+3*panel_margin;
+		y+=p.openwebrxPanelHeight+((p.openwebrxPanelTransparent)?0:3)*panel_margin;
 	}
 }

+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;
+}
+
--- a/htdocs/retry.html
+++ b/htdocs/retry.html
@ -0,0 +1,94 @@
+<html>
+<!--
+
+	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/>.
+
+-->
+<head><title>OpenWebRX</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<style>
+html, body
+{
+	font-family: "DejaVu Sans", Verdana, Geneva, sans-serif;
+	width: 100%;
+	text-align: center;
+	margin: 0;
+	padding: 0;
+}
+img.logo
+{ 
+	margin-top: 120px;
+}
+div.frame
+{
+	text-align: left;
+	margin:0px auto;
+	width: 800px;
+}
+
+div.panel
+{
+	text-align: center;
+	background-color:#777777; 
+	border-radius: 15px;
+	padding: 12px;
+	font-weight: bold;
+	color: White;
+	font-size: 13pt;
+	/*text-shadow: 1px 1px 4px #444;*/
+	font-family: sans;
+}
+
+div.alt
+{
+	font-size: 10pt;
+	padding-top: 10px;
+}
+
+
+body div a
+{
+	color: #5ca8ff;
+	text-shadow: none;
+}
+
+span.browser
+{
+}
+
+</style>
+<script>
+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); }
+window.addEventListener("load",function(){rs=document.getElementById("reconnect-secs"); rt=document.getElementById("reconnect-text"); cnt=29;window.setInterval(function(){if(cnt<=-1) window.location.href=window.location.href.split("retry.")[0]; else if(cnt==0) {rt.innerHTML="Reconnecting..."; cnt--;} else rs.innerHTML=(cnt--).toString();},1000);},false);
+</script>
+
+</head>
+<body>
+
+<div class="frame">
+	<img class="logo" src="gfx/openwebrx-logo-big.png" style="height: 60px;"/>
+	<div class="panel">
+		There are no client slots left on this server.
+		<div class="alt">
+			Please wait until a client disconnects.<br /><span id="reconnect-text">We will try to reconnect in <span id="reconnect-secs">30</span> seconds...</span> 
+		</div>
+	</div>
+</div>
+</body>
+</html>
+
--- a/htdocs/sdr.js
+++ b/htdocs/sdr.js
--- a/htdocs/upgrade.html
+++ b/htdocs/upgrade.html
@ -1,21 +1,23 @@
 <html>
 <!--
-OpenWebRX (c) Copyright 2013 Andras Retzler <ha7ilm@sdr.hu>

-This file is part of OpenWebRX.
+	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>

-    OpenWebRX is free software: you can redistribute it and/or modify
-    it under the terms of the GNU 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 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.

-    OpenWebRX is distributed in the hope that it will be useful,
+    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 General Public License for more details.
+    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/>.

-    You should have received a copy of the GNU General Public License
-    along with OpenWebRX. If not, see <http://www.gnu.org/licenses/>.
 -->
 <head><title>OpenWebRX</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <style>
--- a/openwebrx.py
+++ b/openwebrx.py
@ -1,31 +1,26 @@
 #!/usr/bin/python2
 print "" # python2.7 is required to run OpenWebRX instead of python3. Please run me by: python2 openwebrx.py
 """
-OpenWebRX: open-source web based SDR for everyone!

-This file is part of OpenWebRX.
+	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>

-    OpenWebRX is free software: you can redistribute it and/or modify
-    it under the terms of the GNU 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 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.

-    OpenWebRX is distributed in the hope that it will be useful,
+    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 General Public License for more details.
+    GNU Affero General Public License for more details.

-    You should have received a copy of the GNU General Public License
-    along with OpenWebRX.  If not, see <http://www.gnu.org/licenses/>.
-
-Authors:
-    Andras Retzler, HA7ILM <randras@sdr.hu>
+    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/>.

 """
-
-# http://www.codeproject.com/Articles/462525/Simple-HTTP-Server-and-Client-in-Python
-# some ideas are used from the artice above
-
+sw_version="v0.12+"

 import os
 import code
@ -54,6 +49,11 @@ import rxws
 import uuid
 import config_webrx as cfg
 import signal
+import socket
+
+try: import sdrhu
+except: sdrhu=False
+avatar_ctime=""

 #pypy compatibility
 try: import dl
@ -62,7 +62,6 @@ try: import __pypy__
 except: pass
 pypy="__pypy__" in globals()

-
 def import_all_plugins(directory):
 	for subdir in os.listdir(directory):
 		if os.path.isdir(directory+subdir) and not subdir[0]=="_":
@ -80,9 +79,9 @@ def handle_signal(signal, frame):
 	os._exit(1) #not too graceful exit

 def main():
-	global clients, clients_mutex, pypy
+	global clients, clients_mutex, pypy, lock_try_time, avatar_ctime
 	print
-	print "OpenWebRX - Open Source Web Based SDR for Everyone  | for license see LICENSE file in the package"
+	print "OpenWebRX - Open Source SDR Web App for Everyone!  | for license see LICENSE file in the package"
 	print "_________________________________________________________________________________________________"
 	print 
 	print "Author contact info:    Andras Retzler, HA7ILM <randras@sdr.hu>"
@ -123,14 +122,34 @@ def main():
 	#Initialize clients
 	clients=[]
 	clients_mutex=threading.Lock()
+	lock_try_time=0
+
+	#Start watchdog thread
+	print "[openwebrx-main] Starting watchdog threads."
+	mutex_test_thread=threading.Thread(target = mutex_test_thread_function, args = ())
+	mutex_test_thread.start()
+	mutex_watchdog_thread=threading.Thread(target = mutex_watchdog_thread_function, args = ())
+	mutex_watchdog_thread.start()
+	

 	#Start spectrum thread
 	print "[openwebrx-main] Starting spectrum thread."
 	spectrum_thread=threading.Thread(target = spectrum_thread_function, args = ())
 	spectrum_thread.start()

+	get_cpu_usage()
+	bcastmsg_thread=threading.Thread(target = bcastmsg_thread_function, args = ())
+	bcastmsg_thread.start()
+	
 	#threading.Thread(target = measure_thread_function, args = ()).start()

+	#Start sdr.hu update thread
+	if sdrhu and cfg.sdrhu_key and cfg.sdrhu_public_listing: 
+		print "[openwebrx-main] Starting sdr.hu update thread..."
+		sdrhu_thread=threading.Thread(target = sdrhu.run, args = ())
+		sdrhu_thread.start()
+		avatar_ctime=str(os.path.getctime("htdocs/gfx/openwebrx-avatar.png"))
+	
 	#Start HTTP thread
 	httpd = MultiThreadHTTPServer(('', cfg.web_port), WebRXHandler)
 	print('[openwebrx-main] Starting HTTP server.')
@ -146,23 +165,67 @@ def measure_thread_function():
 		measure_value=0
 		time.sleep(1)

+def bcastmsg_thread_function():
+	global clients
+	while True:
+		time.sleep(3)
+		try: cpu_usage=get_cpu_usage()
+		except: cpu_usage=0
+		cma("bcastmsg_thread")
+		for i in range(0,len(clients)):
+			clients[i].bcastmsg="MSG cpu_usage={0} clients={1}".format(int(cpu_usage*100),len(clients))
+		cmr()
+
+def mutex_test_thread_function():
+	global clients_mutex, lock_try_time
+	while True:
+		time.sleep(0.5)
+		lock_try_time=time.time()
+		clients_mutex.acquire()
+		clients_mutex.release()
+		lock_try_time=0
+
+def cma(what): #clients_mutex acquire
+	global clients_mutex
+	global clients_mutex_locker
+	if not clients_mutex.locked(): clients_mutex_locker = what
+	clients_mutex.acquire()
+
+def cmr():
+	global clients_mutex
+	global clients_mutex_locker
+	clients_mutex_locker = None
+	clients_mutex.release()
+
+def mutex_watchdog_thread_function():
+	global lock_try_time
+	global clients_mutex_locker
+	global clients_mutex
+	while True:
+		if lock_try_time != 0 and time.time()-lock_try_time > 3.0: 
+			#if 3 seconds pass without unlock
+			print "[openwebrx-watchdog] Mutex unlock timeout. Locker: \""+str(clients_mutex_locker)+"\" Now unlocking..." 
+			clients_mutex.release()
+		time.sleep(0.5)	
 		
 def spectrum_thread_function():
-	global clients_mutex
 	global clients
 	dsp=getattr(plugins.dsp,cfg.dsp_plugin).plugin.dsp_plugin()
 	dsp.set_demodulator("fft")
 	dsp.set_samp_rate(cfg.samp_rate)
 	dsp.set_fft_size(cfg.fft_size)
 	dsp.set_fft_fps(cfg.fft_fps)
+	dsp.set_fft_compression(cfg.fft_compression)
+	dsp.set_format_conversion(cfg.format_conversion)
 	sleep_sec=0.87/cfg.fft_fps
 	print "[openwebrx-spectrum] Spectrum thread initialized successfully."
 	dsp.start()
 	print "[openwebrx-spectrum] Spectrum thread started." 
+	bytes_to_read=int(dsp.get_fft_bytes_to_read())
 	while True:
-		data=dsp.read(cfg.fft_size*4)
+		data=dsp.read(bytes_to_read)
 		#print "gotcha",len(data),"bytes of spectrum data via spectrum_thread_function()"
-		clients_mutex.acquire()
+		cma("spectrum_thread")
 		correction=0
 		for i in range(0,len(clients)):
 			i-=correction
@ -173,18 +236,17 @@ def spectrum_thread_function():
 					correction+=1
 				else:
 					clients[i].spectrum_queue.put([data]) # add new string by "reference" to all clients
-		clients_mutex.release()
+		cmr()
 	
 def get_client_by_id(client_id, use_mutex=True):
-	global clients_mutex
 	global clients
 	output=-1
-	if use_mutex: clients_mutex.acquire()
+	if use_mutex: cma("get_client_by_id")
 	for i in range(0,len(clients)):
 		if(clients[i].id==client_id):
 			output=i
 			break
-	if use_mutex: clients_mutex.release()
+	if use_mutex: cmr()
 	if output==-1:
 		raise ClientNotFoundException
 	else:
@ -195,53 +257,69 @@ def log_client(client, what):

 def cleanup_clients():
 	# if client doesn't open websocket for too long time, we drop it
-	global clients_mutex
 	global clients
-	clients_mutex.acquire()
+	cma("cleanup_clients")
 	correction=0
 	for i in range(0,len(clients)):
 		i-=correction
 		#print "cleanup_clients:: len(clients)=", len(clients), "i=", i
-		if (not clients[i].ws_started) and (time.time()-clients[i].gen_time)>180:
+		if (not clients[i].ws_started) and (time.time()-clients[i].gen_time)>45:
 			print "[openwebrx] cleanup_clients :: client timeout to open WebSocket"
 			close_client(i, False)
 			correction+=1
-	clients_mutex.release()
+	cmr()

 def generate_client_id(ip):
 	#add a client
 	global clients
-	global clients_mutex
-	new_client=namedtuple("ClientStruct", "id gen_time ws_started sprectum_queue ip closed")	
+	new_client=namedtuple("ClientStruct", "id gen_time ws_started sprectum_queue ip closed bcastmsg dsp")	
 	new_client.id=md5.md5(str(random.random())).hexdigest()
 	new_client.gen_time=time.time()
 	new_client.ws_started=False # to check whether client has ever tried to open the websocket
 	new_client.spectrum_queue=Queue.Queue(1000)
 	new_client.ip=ip
+	new_client.bcastmsg=""
 	new_client.closed=[False] #byref, not exactly sure if required
-	clients_mutex.acquire()
+	new_client.dsp=None
+	cma("generate_client_id")
 	clients.append(new_client)
 	log_client(new_client,"client added. Clients now: {0}".format(len(clients)))
-	clients_mutex.release()
+	cmr()
 	cleanup_clients()
 	return new_client.id

 def close_client(i, use_mutex=True):
-	global clients_mutex
 	global clients
 	log_client(clients[i],"client being closed.")
-	if use_mutex: clients_mutex.acquire()
+	if use_mutex: cma("close_client")
+	try:
+		clients[i].dsp.stop()
+	except:
+		exc_type, exc_value, exc_traceback = sys.exc_info()
+		print "[openwebrx] close_client dsp.stop() :: error -",exc_type,exc_value
+		traceback.print_tb(exc_traceback)
 	clients[i].closed[0]=True
 	del clients[i]
-	if use_mutex: clients_mutex.release()
+	if use_mutex: cmr()
+
+# http://www.codeproject.com/Articles/462525/Simple-HTTP-Server-and-Client-in-Python
+# some ideas are used from the artice above

 class WebRXHandler(BaseHTTPRequestHandler):    
 	def proc_read_thread():
 		pass

+	def send_302(self,what):
+		self.send_response(302)
+		self.send_header('Content-type','text/html')
+		self.send_header("Location", "http://{0}:{1}/{2}".format(cfg.server_hostname,cfg.web_port,what))
+		self.end_headers()
+		self.wfile.write("<html><body><h1>Object moved</h1>Please <a href=\"/{0}\">click here</a> to continue.</body></html>".format(what))
+
+
 	def do_GET(self):
-		global dsp_plugin
-		global clients_mutex
+		self.connection.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+		global dsp_plugin, clients_mutex, clients, avatar_ctime, sw_version
 		rootdir = 'htdocs' 
 		self.path=self.path.replace("..","")
 		path_temp_parts=self.path.split("?")
@ -251,19 +329,20 @@ class WebRXHandler(BaseHTTPRequestHandler):
 			if self.path=="/":
 				self.path="/index.wrx"
 			# there's even another cool tip at http://stackoverflow.com/questions/4419650/how-to-implement-timeout-in-basehttpserver-basehttprequesthandler-python
+			#if self.path[:5]=="/lock": cma("do_GET /lock/") # to test mutex_watchdog_thread. Do not uncomment in production environment!
 			if self.path[:4]=="/ws/":
 				try:
 					# ========= WebSocket handshake  =========
 					ws_success=True
 					try:				
 						rxws.handshake(self)
-						clients_mutex.acquire()				
+						cma("do_GET /ws/")				
 						client_i=get_client_by_id(self.path[4:], False)
 						myclient=clients[client_i]
 					except rxws.WebSocketException: ws_success=False
 					except ClientNotFoundException: ws_success=False
 					finally:
-						if clients_mutex.locked(): clients_mutex.release()
+						if clients_mutex.locked(): cmr()
 					if not ws_success:
 						self.send_error(400, 'Bad request.')
 						return
@ -280,7 +359,7 @@ class WebRXHandler(BaseHTTPRequestHandler):
 						return
 					myclient.ws_started=True
 					#send default parameters
-					rxws.send(self, "MSG center_freq={0} bandwidth={1} fft_size={2} fft_fps={3} setup".format(str(cfg.center_freq),str(cfg.samp_rate),cfg.fft_size,cfg.fft_fps))
+					rxws.send(self, "MSG center_freq={0} bandwidth={1} fft_size={2} fft_fps={3} audio_compression={4} fft_compression={5} max_clients={6} setup".format(str(cfg.shown_center_freq),str(cfg.samp_rate),cfg.fft_size,cfg.fft_fps,cfg.audio_compression,cfg.fft_compression,cfg.max_clients))

 					# ========= Initialize DSP =========
 					dsp=getattr(plugins.dsp,cfg.dsp_plugin).plugin.dsp_plugin()
@ -288,7 +367,10 @@ class WebRXHandler(BaseHTTPRequestHandler):
 					dsp.set_demodulator("nfm")
 					dsp.set_offset_freq(0)
 					dsp.set_bpf(-4000,4000)
+					dsp.set_audio_compression(cfg.audio_compression)
+					dsp.set_format_conversion(cfg.format_conversion)
 					dsp.start()
+					myclient.dsp=dsp
 					
 					while True:
 						if myclient.closed[0]: 
@ -296,15 +378,21 @@ class WebRXHandler(BaseHTTPRequestHandler):
 							break

 						# ========= send audio =========
-						temp_audio_data=dsp.read(1024*8)
+						temp_audio_data=dsp.read(256)
 						rxws.send(self, temp_audio_data, "AUD ")

 						# ========= send spectrum =========
 						while not myclient.spectrum_queue.empty():
 							spectrum_data=myclient.spectrum_queue.get()
-							spectrum_data_mid=len(spectrum_data[0])/2
-							rxws.send(self, spectrum_data[0][spectrum_data_mid:]+spectrum_data[0][:spectrum_data_mid], "FFT ") 
+							#spectrum_data_mid=len(spectrum_data[0])/2
+							#rxws.send(self, spectrum_data[0][spectrum_data_mid:]+spectrum_data[0][:spectrum_data_mid], "FFT ") 
 							# (it seems GNU Radio exchanges the first and second part of the FFT output, we correct it)
+							rxws.send(self, spectrum_data[0],"FFT ")
+
+						# ========= send bcastmsg =========
+						if myclient.bcastmsg!="":
+							rxws.send(self,myclient.bcastmsg)
+							myclient.bcastmsg=""

 						# ========= process commands =========
 						while True:
@ -328,9 +416,10 @@ class WebRXHandler(BaseHTTPRequestHandler):
 									elif param_name == "offset_freq" and -cfg.samp_rate/2 <= float(param_value) <= cfg.samp_rate/2:
 										dsp.set_offset_freq(int(param_value))
 									elif param_name=="mod":
-										dsp.stop()
-										dsp.set_demodulator(param_value)
-										dsp.start()
+										if (dsp.get_demodulator()!=param_value):
+											dsp.stop()
+											dsp.set_demodulator(param_value)
+											dsp.start()
 									else:
 										print "[openwebrx-httpd:ws] invalid parameter"
 								if bpf_set:
@ -355,7 +444,7 @@ class WebRXHandler(BaseHTTPRequestHandler):

 				#delete disconnected client
 				try:
-					clients_mutex.acquire()
+					cma("do_GET /ws/ delete disconnected")
 					id_to_close=get_client_by_id(myclient.id,False)
 					close_client(id_to_close,False)
 				except:
@ -363,19 +452,23 @@ class WebRXHandler(BaseHTTPRequestHandler):
 					print "[openwebrx-httpd] client cannot be closed: ",exc_type,exc_value
 					traceback.print_tb(exc_traceback)
 				finally:
-					clients_mutex.release()
+					cmr()
 				return
+			elif self.path in ("/status", "/status/"):
+				#self.send_header('Content-type','text/plain')
+				getbands=lambda: str(int(cfg.shown_center_freq-cfg.samp_rate/2))+"-"+str(int(cfg.shown_center_freq+cfg.samp_rate/2))
+				self.wfile.write("status=active\nname="+cfg.receiver_name+"\nsdr_hw="+cfg.receiver_device+"\nop_email="+cfg.receiver_admin+"\nbands="+getbands()+"\nusers="+str(len(clients))+"\navatar_ctime="+avatar_ctime+"\ngps="+str(cfg.receiver_gps)+"\nasl="+str(cfg.receiver_asl)+"\nloc="+cfg.receiver_location+"\nsw_version="+sw_version+"\nantenna="+cfg.receiver_ant+"\n")
+				print "[openwebrx-httpd] GET /status/ from",self.client_address[0]			
 			else:
 				f=open(rootdir+self.path)
 				data=f.read()
 				extension=self.path[(len(self.path)-4):len(self.path)]
 				extension=extension[2:] if extension[1]=='.' else extension[1:]
-				if extension == "wrx" and ((self.headers['user-agent'].count("Chrome")==0 and self.headers['user-agent'].count("Firefox")==0) if 'user-agent' in self.headers.keys() else True) and (not request_param.count("unsupported")):
-					self.send_response(302)
-					self.send_header('Content-type','text/html')
-					self.send_header("Location", "http://{0}:{1}/upgrade.html".format(cfg.server_hostname,cfg.web_port))
-					self.end_headers()
-					self.wfile.write("<html><body><h1>Object moved</h1>Please <a href=\"/upgrade.html\">click here</a> to continue.</body></html>")
+				if extension == "wrx" and ((self.headers['user-agent'].count("Chrome")==0 and self.headers['user-agent'].count("Firefox")==0 and (not "Googlebot" in self.headers['user-agent'])) if 'user-agent' in self.headers.keys() else True) and (not request_param.count("unsupported")):
+					self.send_302("upgrade.html")
+					return
+				if extension == "wrx" and cfg.max_clients<=len(clients):
+					self.send_302("retry.html")
 					return
 				self.send_response(200)
 				if(("wrx","html","htm").count(extension)):
@ -388,7 +481,7 @@ class WebRXHandler(BaseHTTPRequestHandler):
 				if extension == "wrx":
 					replace_dictionary=(
 						("%[RX_PHOTO_DESC]",cfg.photo_desc),
-						("%[CLIENT_ID]",generate_client_id(self.client_address[0])),
+						("%[CLIENT_ID]", generate_client_id(self.client_address[0])) if "%[CLIENT_ID]" in data else "",
 						("%[WS_URL]","ws://"+cfg.server_hostname+":"+str(cfg.web_port)+"/ws/"),
 						("%[RX_TITLE]",cfg.receiver_name),
 						("%[RX_LOC]",cfg.receiver_location),
@ -398,7 +491,8 @@ class WebRXHandler(BaseHTTPRequestHandler):
 						("%[RX_PHOTO_HEIGHT]",str(cfg.photo_height)),("%[RX_PHOTO_TITLE]",cfg.photo_title),
 						("%[RX_ADMIN]",cfg.receiver_admin),
 						("%[RX_ANT]",cfg.receiver_ant),
-						("%[RX_DEVICE]",cfg.receiver_device)
+						("%[RX_DEVICE]",cfg.receiver_device),
+						("%[AUDIO_BUFSIZE]",str(cfg.client_audio_buffer_size))
 					)
 					for rule in replace_dictionary:
 						while data.find(rule[0])!=-1:
@ -417,6 +511,27 @@ class WebRXHandler(BaseHTTPRequestHandler):
 class ClientNotFoundException(Exception):
 	pass

+last_worktime=0
+last_idletime=0
+
+def get_cpu_usage():
+	global last_worktime, last_idletime
+	f=open("/proc/stat","r")
+	line=""
+	while not "cpu " in line: line=f.readline()
+	f.close()
+	spl=line.split(" ")
+	worktime=int(spl[2])+int(spl[3])+int(spl[4])
+	idletime=int(spl[5])
+	dworktime=(worktime-last_worktime)
+	didletime=(idletime-last_idletime)
+	rate=float(dworktime)/(didletime+dworktime)
+	last_worktime=worktime
+	last_idletime=idletime
+	if(last_worktime==0): return 0
+	return rate
+
+
 if __name__=="__main__":
 	main()

--- a/plugins/init.py
+++ b/plugins/init.py
--- a/plugins/dsp/init.py
+++ b/plugins/dsp/init.py
--- a/plugins/dsp/csdr/init.py
+++ b/plugins/dsp/csdr/init.py
--- a/plugins/dsp/csdr/plugin.py
+++ b/plugins/dsp/csdr/plugin.py
@ -1,13 +1,36 @@
+"""
+OpenWebRX csdr plugin: do the signal processing with csdr
+
+	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/>.
+
+"""
+
 import subprocess
 import time
 import os
 import code
+import signal

 class dsp_plugin:

 	def __init__(self):
 		self.samp_rate = 250000
-		self.output_rate = 44100 #this is default, and cannot be set at the moment
+		self.output_rate = 11025 #this is default, and cannot be set at the moment
 		self.fft_size = 1024
 		self.fft_fps = 5
 		self.offset_freq = 0
@ -16,20 +39,42 @@ class dsp_plugin:
 		self.bpf_transition_bw = 320 #Hz, and this is a constant
 		self.ddc_transition_bw_rate = 0.15 # of the IF sample rate
 		self.running = False
-		chain_begin="nc localhost 4951 | csdr convert_u8_f | csdr shift_addition_cc --fifo {shift_pipe} | csdr fir_decimate_cc {decimation} {ddc_transition_bw} HAMMING | csdr bandpass_fir_fft_cc --fifo {bpf_pipe} {bpf_transition_bw} HAMMING | "
-		self.chains = {
-			"nfm" :  chain_begin + "csdr fmdemod_quadri_cf | csdr limit_ff | csdr fractional_decimator_ff {last_decimation} | csdr deemphasis_nfm_ff 44100 | csdr fastagc_ff | csdr convert_f_i16",
-			"am" :  chain_begin + "csdr amdemod_cf | csdr fastdcblock_ff | csdr fractional_decimator_ff {last_decimation} | csdr agc_ff | csdr limit_ff | csdr convert_f_i16",
-			"ssb" :  chain_begin + "csdr realpart_cf | csdr fractional_decimator_ff {last_decimation} | csdr agc_ff | csdr limit_ff | csdr convert_f_i16",
-			"fft" : "nc -vv localhost 4951 | csdr convert_u8_f | csdr fft_cc {fft_size} {fft_block_size} | csdr logpower_cf -70"
-			}
+		self.audio_compression = "none"
+		self.fft_compression = "none"
 		self.demodulator = "nfm"
 		self.name = "csdr"
+		self.format_conversion = "csdr convert_u8_f"
 		try:	
-			subprocess.Popen("nc",stdout=subprocess.PIPE,stderr=subprocess.PIPE)
+			subprocess.Popen("nc",stdout=subprocess.PIPE,stderr=subprocess.PIPE).kill()
 		except:
 			print "[openwebrx-plugin:csdr] error: netcat not found, please install netcat!"

+	def chain(self,which):
+		any_chain_base="nc -v localhost 4951 | "+self.format_conversion+(" | " if  self.format_conversion!="" else "")+"csdr flowcontrol {flowcontrol} 10 | "
+		if which == "fft": 
+			fft_chain_base = "sleep 1; "+any_chain_base+"csdr fft_cc {fft_size} {fft_block_size} | csdr logpower_cf -70 | csdr fft_exchange_sides_ff {fft_size}"
+			if self.fft_compression=="adpcm":
+				return fft_chain_base+" | csdr compress_fft_adpcm_f_u8 {fft_size}"
+			else:
+				return fft_chain_base
+		chain_begin=any_chain_base+"csdr shift_addition_cc --fifo {shift_pipe} | csdr fir_decimate_cc {decimation} {ddc_transition_bw} HAMMING | csdr bandpass_fir_fft_cc --fifo {bpf_pipe} {bpf_transition_bw} HAMMING | "
+		chain_end = "" 
+		if self.audio_compression=="adpcm":
+			chain_end = " | csdr encode_ima_adpcm_i16_u8"
+		if which == "nfm": return chain_begin + "csdr fmdemod_quadri_cf | csdr limit_ff | csdr fractional_decimator_ff {last_decimation} | csdr deemphasis_nfm_ff 11025 | csdr fastagc_ff | csdr convert_f_i16"+chain_end
+		elif which == "am":	return chain_begin + "csdr amdemod_cf | csdr fastdcblock_ff | csdr fractional_decimator_ff {last_decimation} | csdr agc_ff | csdr limit_ff | csdr convert_f_i16"+chain_end
+		elif which == "ssb": return chain_begin + "csdr realpart_cf | csdr fractional_decimator_ff {last_decimation} | csdr agc_ff | csdr limit_ff | csdr convert_f_i16"+chain_end
+
+	def set_audio_compression(self,what):
+		self.audio_compression = what
+
+	def set_fft_compression(self,what):
+		self.fft_compression = what
+
+	def get_fft_bytes_to_read(self):
+		if self.fft_compression=="none": return self.fft_size*4
+		if self.fft_compression=="adpcm": return (self.fft_size/2)+(10/2)
+
 	def set_samp_rate(self,samp_rate):
 		#to change this, restart is required
 		self.samp_rate=samp_rate
@ -47,11 +92,13 @@ class dsp_plugin:
 	def get_output_rate(self):
 		return self.output_rate

-
 	def set_demodulator(self,demodulator):
 		#to change this, restart is required
 		self.demodulator=demodulator

+	def get_demodulator(self):
+		return self.demodulator
+
 	def set_fft_size(self,fft_size):
 		#to change this, restart is required
 		self.fft_size=fft_size
@ -63,6 +110,9 @@ class dsp_plugin:
 	def fft_block_size(self):
 		return self.samp_rate/self.fft_fps

+	def set_format_conversion(self,format_conversion):
+		self.format_conversion=format_conversion
+
 	def set_offset_freq(self,offset_freq):
 		self.offset_freq=offset_freq
 		if self.running: 
@ -90,7 +140,7 @@ class dsp_plugin:
 		return self.ddc_transition_bw_rate*(self.if_samp_rate()/float(self.samp_rate))

 	def start(self):
-		command_base=self.chains[self.demodulator]
+		command_base=self.chain(self.demodulator)
 		
 		#create control pipes for csdr
 		pipe_base_path="/tmp/openwebrx_pipe_{myid}_".format(myid=id(self))
@ -103,10 +153,10 @@ class dsp_plugin:
 			self.mkfifo(self.shift_pipe)

 		#run the command
-		command=command_base.format(bpf_pipe=self.bpf_pipe,shift_pipe=self.shift_pipe,decimation=self.decimation,last_decimation=self.last_decimation,fft_size=self.fft_size,fft_block_size=self.fft_block_size(),bpf_transition_bw=float(self.bpf_transition_bw)/self.if_samp_rate(),ddc_transition_bw=self.ddc_transition_bw())
+		command=command_base.format(bpf_pipe=self.bpf_pipe,shift_pipe=self.shift_pipe,decimation=self.decimation,last_decimation=self.last_decimation,fft_size=self.fft_size,fft_block_size=self.fft_block_size(),bpf_transition_bw=float(self.bpf_transition_bw)/self.if_samp_rate(),ddc_transition_bw=self.ddc_transition_bw(),flowcontrol=int(self.samp_rate*4*2*1.5))
 		print "[openwebrx-dsp-plugin:csdr] Command =",command
 		#code.interact(local=locals())
-		self.process = subprocess.Popen(command, stdout=subprocess.PIPE, shell=True)
+		self.process = subprocess.Popen(command, stdout=subprocess.PIPE, shell=True, preexec_fn=os.setpgrp)
 		self.running = True

 		#open control pipes for csdr and send initialization data
@ -121,12 +171,22 @@ class dsp_plugin:
 		return self.process.stdout.read(size)
 		
 	def stop(self):
-		if(self.process!=None):return # returns None while subprocess is running
-		while(self.process.poll()==None):
-			self.process.kill()
-			time.sleep(0.1)
-		os.unlink(self.bpf_pipe)
-		os.unlink(self.shift_pipe)
+		os.killpg(os.getpgid(self.process.pid), signal.SIGTERM) 
+		#if(self.process.poll()!=None):return # returns None while subprocess is running
+		#while(self.process.poll()==None):
+		#	#self.process.kill()
+		#	print "killproc",os.getpgid(self.process.pid),self.process.pid
+		#	os.killpg(self.process.pid, signal.SIGTERM) 
+		#	
+		#	time.sleep(0.1)
+		try:
+			os.unlink(self.bpf_pipe)
+		except:
+			print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.bpf_pipe
+		try:
+			os.unlink(self.shift_pipe)
+		except:
+			print "[openwebrx-dsp-plugin:csdr] stop() :: unlink failed: " + self.bpf_pipe
 		self.running = False

 	def restart(self):
--- a/rtl_mus.py
+++ b/rtl_mus.py
@ -1,20 +1,20 @@
 '''
-This file is part of RTL Multi-User Server, 
+	This file is part of RTL Multi-User Server, 
 	that makes multi-user access to your DVB-T dongle used as an SDR.
-Copyright (c) 2013-2014 by Andras Retzler, HA7ILM <randras@sdr.hu>
+	Copyright (c) 2013-2015 by Andras Retzler <randras@sdr.hu>

-RTL Multi-User Server is free software: you can redistribute it and/or modify
-it under the terms of the GNU 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 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.

-RTL Multi-User Server 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 General Public License for more details.
+    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 General Public License
-along with RTL Multi-User Server.  If not, see <http://www.gnu.org/licenses/>.
+    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/>.

 -----

@ -87,7 +87,7 @@ def add_data_to_clients(new_data):
 			elif cfg.cache_full_behaviour == 1:
 				#rather closing client:
 				log.error("client cache full, dropping client: "+str(client[0].ident)+"@"+client[0].socket[1][0])
-				client[0].close()
+				client[0].close(False)
 			elif cfg.cache_full_behaviour == 2:
 				pass #client cache full, just not taking care
 			else: log.error("invalid value for cfg.cache_full_behaviour")
@ -131,6 +131,7 @@ class client_handler(asyncore.dispatcher):
 		self.sent_dongle_id=False
 		self.last_waiting_buffer=""
 		asyncore.dispatcher.__init__(self, self.client[0].socket[0])
+		self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)

 	def handle_read(self):
 		global commands
@ -174,6 +175,7 @@ class server_asyncore(asyncore.dispatcher):
 		self.set_reuse_addr()
 		self.bind((cfg.my_ip, cfg.my_listening_port))
 		self.listen(5)
+		self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
 		log.info("Server listening on port: "+str(cfg.my_listening_port))

 	def handle_accept(self):
@ -188,7 +190,7 @@ class server_asyncore(asyncore.dispatcher):
 			my_client[0].ident=max_client_id
 			max_client_id+=1
 			my_client[0].start_time=time.time()
-			my_client[0].waiting_data=multiprocessing.Queue(250)
+			my_client[0].waiting_data=multiprocessing.Queue(500)
 			clients_mutex.acquire()
 			clients.append(my_client)
 			clients_mutex.release()
@ -223,6 +225,7 @@ class rtl_tcp_asyncore(asyncore.dispatcher):
 	def __init__(self):
 		global server_missing_logged
 		asyncore.dispatcher.__init__(self)
+		self.password_sent = False
 		self.ok=True
 		self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
 		try:		
@ -255,6 +258,7 @@ class rtl_tcp_asyncore(asyncore.dispatcher):
 		global server_missing_logged
 		global rtl_tcp_connected
 		self.socket.settimeout(0.1)
+		self.password_sent = False
 		rtl_tcp_connected=True
 		if self.ok:
 			log.info("rtl_tcp host connection estabilished")
@ -278,9 +282,9 @@ class rtl_tcp_asyncore(asyncore.dispatcher):
 		if(len(rtl_dongle_identifier)==0):
 			rtl_dongle_identifier=self.recv(12)
 			return
-		new_data_buffer=self.recv(16348)
+		new_data_buffer=self.recv(1024*16)
 		if cfg.watchdog_interval:
-			watchdog_data_count+=16348
+			watchdog_data_count+=1024*16
 		if cfg.use_dsp_command:
 			dsp_input_queue.put(new_data_buffer)
 			#print "did put anyway"
@ -288,11 +292,16 @@ class rtl_tcp_asyncore(asyncore.dispatcher):
 			add_data_to_clients(new_data_buffer)

 	def writable(self):
+		
 		#check if any new commands to write
 		global commands
-		return not commands.empty()
+		return (not self.password_sent and cfg.rtl_tcp_password != None) or not commands.empty()

 	def handle_write(self):
+		if(not self.password_sent and cfg.rtl_tcp_password != None):
+			log.info("Sending rtl_tcp_password...")
+			self.send(cfg.rtl_tcp_password)
+			self.password_sent = True
 		global commands
 		while not commands.empty():
 			mcmd=commands.get()
@ -418,11 +427,13 @@ class client:
 	socket=None
 	asyncore=None

-	def close(self):
+	def close(self, use_mutex=True):
 		global clients_mutex
 		global clients
-		clients_mutex.acquire()
+		if use_mutex: clients_mutex.acquire()
+		correction=0
 		for i in range(0,len(clients)):
+			i-=correction
 			if clients[i][0].ident==self.ident:
 				try:
 					self.socket.close()
@ -433,8 +444,9 @@ class client:
 					del self.asyncore
 				except:
 					pass
-				break
-		clients_mutex.release()
+				del clients[i]
+				correction+=1
+		if use_mutex: clients_mutex.release()


 def main():
--- a/rxws.py
+++ b/rxws.py
@ -1,23 +1,22 @@
 """
 rxws: WebSocket methods implemented for OpenWebRX

-This file is part of OpenWebRX.
+	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>

-    OpenWebRX is free software: you can redistribute it and/or modify
-    it under the terms of the GNU 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 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.

-    OpenWebRX is distributed in the hope that it will be useful,
+    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 General Public License for more details.
+    GNU Affero General Public License for more details.

-    You should have received a copy of the GNU General Public License
-    along with OpenWebRX.  If not, see <http://www.gnu.org/licenses/>.
-
-Authors:
-    Andras Retzler, HA7ILM <retzlerandras@gmail.com>
+    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/>.

 """

--- a/screenshot.png
+++ b/screenshot.png
--- a/sdrhu.py
+++ b/sdrhu.py
@ -0,0 +1,51 @@
+#!/usr/bin/python2
+"""
+
+	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/>.
+
+"""
+
+import config_webrx as cfg, time, subprocess
+
+def run(continuously=True):
+	if not cfg.sdrhu_key: return 
+	firsttime="(Your receiver is soon getting listed on sdr.hu!)"
+	while True:
+		cmd = "wget --timeout=15 -qO- http://sdr.hu/update --post-data \"url=http://"+cfg.server_hostname+":"+str(cfg.web_port)+"&apikey="+cfg.sdrhu_key+"\" 2>&1"
+		#print "[openwebrx-sdrhu]", cmd
+		returned=subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE).communicate()
+		returned=returned[0]
+		#print returned
+		if "UPDATE:" in returned:
+			retrytime_mins = 20
+			value=returned.split("UPDATE:")[1].split("\n",1)[0]
+			if value.startswith("SUCCESS"):
+				print "[openwebrx-sdrhu] Update succeeded! "+firsttime
+				firsttime=""
+			else:
+				print "[openwebrx-sdrhu] Update failed, your receiver cannot be listed on sdr.hu! Reason:", value
+		else:
+			retrytime_mins = 2
+			print "[openwebrx-sdrhu] wget failed while updating, your receiver cannot be listed on sdr.hu!"
+		if not continuously: break
+		time.sleep(60*retrytime_mins)
+
+if __name__=="__main__":
+	run(False)
+
+