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RTLSDR AM demodulator, support multiple channels per dongle, intended for x86 and Raspberry Pi

License

GPL-3.0 license
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RTLSDR-Airband

RTLSDR Airband BCFY is intended for Airband reception and online streaming to www.broadcastify.com

Features

  • Decode up to eight AM channels per dongle (within bandwidth frequency range)
  • 16 KHz AM filter bandwidth
  • Decode multiple dongles simutaneously
  • Auto squelch and Automatic Gain Control
  • MP3 encoding
  • Stream to Icecast or SHOUTcast server

Performance

x86

  • ~4% per dongle on i5-2430m at 2.1 GHz

Raspberry Pi

  • FFT using Broadcom Videocore IV GPU
  • No overclock required when using 1 dongle plus another dongle running dump1090
  • Turbo overclock setting recommended on RPi V1 when using 2 dongles (no overclocking is necessary on RPi V2)

Demo

Demo (Windows version)

Windows Binary

Building

Windows using VS Express 2013 for Desktop

Getting/Building prerequisites

FFTW3
  • Download fftw-3.3.4-dll32.zip from http://www.fftw.org/install/windows.html
  • Start the VS2013 x86 Native Tools Command Prompt
  • Run lib /def:libfftw3f-3.def to get libfftw3f-3.lib
  • Place the lib into win32/lib
  • Place fftw3.h into win32/include
  • Place libfftw3f-3.dll into the root folder
libogg and libvorbis
  • Download libogg-1.3.1.zip and libvorbis-1.3.4.zip from http://www.xiph.org/downloads/
  • Extract both zip files in the same folder
  • Rename libogg-1.x.x to libogg
  • Open libogg/win32/libogg_static.sln
  • Change to "Release" and build libogg_static
  • Open libvorbis-1.x.x/win32/VS2010/vorbis_static.sln
  • Change to "Release" and build libvorbis_static (NOT the highlighted libvorbisfile)
  • Copy both the generated .libs to win32/lib
  • Copy libogg/includes/ogg (the folder) to win32/include
  • Copy libvorbis-1.x.x/includes/vorbis (the folder) to win32/include
libmp3lame
  • Download from http://sourceforge.net/projects/lame/files/lame/3.99/
  • Open vc_solution/vc9_lame.sln
  • Change the Configuration to ReleaseSSE2
  • (optional) Right click libmp3lame-static and open Properties... C/C++... Code Generation... Enable Enhanced Instruction Set... Advanced Vector Instructions
  • Build libmp3lame-static
  • Copy output/ReleaseSSE2/libmp3lame-static.lib and libmpghip-static.lib to win32/lib
  • Copy include/lame.h to win32/include
librtlsdr
  • Download from http://sdr.osmocom.org/trac/wiki/rtl-sdr (search word: "pre-built")
  • Copy rtl-sdr-release/rtl-sdr.h and rtl-sdr_export.h to win32/includes
  • Copy rtl-sdr-release/x32/rtlsdr.lib to win32/lib
  • Copy rtl-sdr-release/x32/rtlsdr.dll and libusb-1.0.dll to root folder
pthreads
  • Download from ftp://sourceware.org/pub/pthreads-win32/
  • Extract Pre-built.2 to the same folder where libogg and libvorbis are located
  • Copy Pre-built.2/lib/x86/pthreadVCE2.lib to win32/lib
  • Copy Pre-built.2/dll/x86/pthreadVCE2.dll to root folder
libshout
  • This is the most complicated one
  • Download from http://www.icecast.org/download.php
  • Extract libshout to the same folder where libogg and libvorbis are located
  • Go to libshout-2.x.x/include/shout and rename shout.h.in to shout.h
  • Open libshout/win32/libshout.dsw
  • Change to "Release"... and then open project properties
  • On the General page change Character Set to Use Unicode Character Set
  • Go to C/C++... edit Additional Include Directories
  • Add ../../libogg/include, ../../libvorbis-1.x.x/include and ../../Pre-built.2/include
  • Go to C/C++... Preprocessor... edit Preprocessor Definitions
  • Add HAVE_SYS_TIMEB_H and HAVE_FTIME
  • Try to build, you should get errors
  • One of the error is "error C1083: Cannot open include file: 'compat.h': No such file or directory"
  • Double click on it and change that line from #include <compat.h> to #include <os.h>
  • Build again
  • Copy win32/Release/libshout.lib to win32/lib
  • Copy include/shout (the folder) to win32/include

Building this project

  • Browse into win32 and open the solution
  • Simply build solution or click the "Start Local Windows Debugger" button

Raspberry Pi (Raspbian)

  • Install RTLSDR library (http://sdr.osmocom.org/trac/wiki/rtl-sdr) *Installing RTLSDR library:

     sudo apt-get update
 sudo apt-get upgrade
 sudo apt-get install git cmake libusb-1.0-0.dev build-essential
 sudo rpi-update && sudo reboot

 git clone git://git.osmocom.org/rtl-sdr.git
 cd rtl-sdr/
 mkdir build
 cd build
 cmake ../
 make
 sudo make install
 sudo ldconfig
 sudo mv $HOME/rtl-sdr/rtl-sdr.rules /etc/udev/rules.d/rtl-sdr.rules

  • Blacklist DVB drivers to avoid conflict with SDR driver - before connecting the USB dongle:

							echo "blacklist r820t" >> /etc/modprobe.d/dvb-blacklist.conf
							echo "blacklist rtl2832" >> /etc/modprobe.d/dvb-blacklist.conf
							echo "blacklist rtl2830" >> /etc/modprobe.d/dvb-blacklist.conf
							echo "blacklist dvb_usb_rtl28xxu" >> /etc/modprobe.d/dvb-blacklist.conf

*Installing RTLSDR-AIRBAND:

    sudo apt-get install libmp3lame-dev libvorbis-dev libshout-dev
    git clone https://github.com/szpajder/RTLSDR-Airband.git
    cd RTLSDR-Airband/

  • if you are building for RPi V1:

  •  make rtl_airband_vfp

  • if you are building for RPi V2:

  •  make rtl_airband_neon

  • Then

     sudo mknod char_dev c 100 0

  • You need to edit config.txt with your settings

       nano config.txt

  • You need to run the program with root privileges (eg. sudo ./rtl_airband) sudo ./rtl_airband_neon

Linux, x86

  • Install RTLSDR library (http://sdr.osmocom.org/trac/wiki/rtl-sdr)

  • Blacklist DVB drivers to avoid conflict with SDR driver - before connecting the USB dongle add following lines to /etc/modprobe.d/dvb-blacklist.conf:

     blacklist r820t
 blacklist rtl2832
 blacklist rtl2830
 blacklist dvb_usb_rtl28xxu

  • sudo apt-get install libmp3lame-dev libvorbis-dev libshout-dev libfftw3-dev

  • cd into the project folder (where makefile is located)

  • make rtl_airband

  • You need to run the program with root privileges (eg. sudo ./rtl_airband)

Configuring

All configurations are saved in /etc/rtlairband2_config.txt file. Fields should be separated by space(s) or tab(s).

You may edit config.txt.example using a spreadsheet program.

Format:

NumDongles
DongleNo NumChannels Gain CenterFreq FreqCorrection
Hostname Port MountPoint Frequency Username Password
Hostname Port MountPoint Frequency Username Password
....
DongleNo NumChannels Gain CenterFreq FreqCorrection
Hostname Port MountPoint Frequency Username Password
.....

Example: 1 0 1 260 119800000 -10000 audio9.broadcastify.com 80 1234567 119800000 source your_feed_password

License

Copyright (C) 2014 Wong Man Hang microtony@gmail.com

Changes and updates published on http://github.com/szpajder/RTLSDR-Airband : Copyright (C) 2015 Tomasz Lemiech szpajder@gmail.com

This program 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 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.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Open Source Licenses

###fftw3

  • Copyright (c) 2003, 2007-14 Matteo Frigo
  • Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
  • GNU General Public License Version 2

###gpu_fft Copyright (c) 2013, Andrew Holme. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  • Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

###libmp3lame

  •  Copyright (c) 1999 Mark Taylor

  •  Copyright (c) 2000-2002 Takehiro Tominaga

  •  Copyright (c) 2000-2011 Robert Hegemann

  •  Copyright (c) 2001 Gabriel Bouvigne

  •  Copyright (c) 2001 John Dahlstrom
  • GNU Library General Public License Version 2

###libogg Copyright (c) 2002, Xiph.org Foundation

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

  • Neither the name of the Xiph.org Foundation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

###librtlsdr

  • Copyright (C) 2012 by Steve Markgraf steve@steve-m.de
  • GNU General Public License Version 2

###libshout

  • Copyright (C) 2002-2004 the Icecast team team@icecast.org
  • GNU Library General Public License Version 2

###libvorbis Copyright (c) 2002-2008 Xiph.org Foundation

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

  • Neither the name of the Xiph.org Foundation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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RTLSDR AM demodulator, support multiple channels per dongle, intended for x86 and Raspberry Pi

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