Cross-Platform Software-Defined Radio Application

• liquid-dsp (http://liquidsdr.org/ https://github.com/jgaeddert/liquid-dsp)
• FFTW (http://www.fftw.org/ https://github.com/FFTW/fftw3)
• RtAudio (http://www.music.mcgill.ca/~gary/rtaudio/ http://github.com/thestk/rtaudio/)
• Osmocom RTLSDR (http://sdr.osmocom.org/trac/wiki/rtl-sdr)
• LodePNG (http://lodev.org/lodepng/)
• BMFont (http://www.angelcode.com/ http://www.angelcode.com/products/bmfont/)
• Bitstream Vera font (http://en.wikipedia.org/wiki/Bitstream_Vera)
• OpenGL (https://www.opengl.org/)
• wxWidgets (https://www.wxwidgets.org/)
• CMake (http://www.cmake.org/)

• Simple UI
• Devices
  • RTL-SDR
  • rtl_tcp client
  • gr-osmosdr
• Basic Features
  • Device Selection
  • Bandwidth
  • Color scheme
  • Load/Save session
  • Audio sample rate
  • Device PPM
  • Default preferences
    • Audio defaults
    • Device defaults
  • Bookmarks
  • History
  • Run as rtl_tcp server and visualize control
• Neat Visuals
  • 2D visuals
    • Y Scope
    • Spectrum
    • Waterfall
    • Add faint grid for sense of scale
    • Audio Spectrum
    • X/Y Scope
    • Indicate outer spectrum edges when zoomed
  • 3D visuals
    • I/Q helix
• Demodulation:
  • Basic modular expansion
  • Multiple demodulators per IQ stream
  • Audio device selection
  • Modes
    • FM
    • FM stereo
    • AM
    • LSB
    • USB
    • DSB
    • I/Q
  • Controls
    • Display Frequency and allow manual adjustments
    • Allow selection of demodulation type
    • Display separate zoomed-in view of current waterfall and spectrum, allow adjustments
    • Display signal level and allow squelch control
    • Display audio output selection
    • Volume control
    • Direct frequency input
    • Mute
    • Waterfall speed
    • RTL-SDR Gain
• Basic Input Controls
  • Drag spectrum to change center frequency
  • Hold shift and click on waterfall to create a new demodulator
  • Clicking waterfall adds new demodulator when none visible
  • Drag center of demodulator on waterfall to change frequency
  • Drag edge of demodulator on waterfall to change bandwidth
  • Double-Click to move demodulator to frequency within it's current range
  • Hold alt and drag range on waterfall to set demodulator frequency + bandwidth
  • Hold alt+shift and drag range on waterfall for a new demodulator
  • Hover demodulator on waterfall and press 'space' to toggle stereo
  • Hover demodulator on waterfall and press 'd' or 'delete' to delete it
  • Keyboard arrows adjust frequency, shift for faster change
  • Undo / Redo action
• I/Q Recording and playback
  • Recording
    • Record waterfall output to PNG file chunks of desired height
    • Record I/Q input data
    • Simultaneously record demod decimated I/Q and audio
  • Playback
• Audio
  • Recording
• Implement digital demodulation supported by liquid-dsp: (http://liquidsdr.org/doc/modem.html)
  • Demodulator Lab
    • Demodulator I/Q input filtering
    • Audio output filtering
    • Toggle current demodulator exclusively into "Lab" mode
      • Additional visualizations for audio and I/Q stream
        • Audio Spectrum
        • Constellation / X-Y Scope
      • Digital demodulation status and controls
      • Demodulator AGC, Equalization controls
        • Lock AGC and Equalization when digital lock obtained
      • Digital output
        • Output console
        • Capture file (auto?)
        • Network output
        • Block device output
  • Digital modes available to implement
    • PSK
    • DPSK
    • ASK
    • QAM
    • APSK
    • BPSK
    • QPSK
    • OOK
    • SQAM
    • Star Modem
    • MFSK
    • CPFSK
• Optimization
  • Eliminate large waterfall texture uploads
  • Update visuals to OpenGL 3.x / OpenGL ES
  • Resolve constant refresh on visuals that don't change often
  • Resolve all driver/platform vertical sync issues
  • Group and divide IQ data distribution workload instead of 100% distribution per instance

• Design a plan for expansion via modules (dylib/dll/lua)
• Support shell-based stdin/stdout tools for direct output/playback to/from CLI audio processing apps (i.e. DSD on OSX)
• Update visuals to support OpenGL ES
• Basic demodulator filter(s) that can be enabled and tweaked visually
• Support multiple simultaneous device usage
  • Categorize devices by antenna connections
  • Allow locked frequencies to activate unused devices to continue demodulation on same antenna
• Integrate LUA
  • Expose liquid-dsp functionality
  • Scriptable liquid-dsp demodulation
  • Scriptable digital demodulation output handlers
    • Create block output devices on *nix?
    • Create socket outputs?
    • Visual outputs?
  • Take control of additional devices and spawning new demodulators (i.e. trunkers)
  • Script manager / live editor
  • Provide scriptable liquid-dsp modulation for trancievers?
  • Allow scripts to launch/run headless (no UI)
• "PVR" like mode with waterfall time shifting
• L/R and surround-sound balance settings for separating and listening to mono streams
• Add tool for converting decimated I/Q recording to video
  • Select video features such as title/demodulation/scope/waterfall/etc
  • Render to video from GL frames->ffmpeg/mencoder /w demodulated audio
• Accessability / Control
  • USB/MIDI control surfaces
  • Joystick / gamepad input
  • Vibration / force-feeback
• Investigate compilation via emscripten using rtl_tcp for input
  • Create web server+rtl_tcp bundle for embedded devices
  • Use emscripten compiled CubicSDR via embedded web server

• OSX
• Windows
• Linux
• HTML5

• GPL