libluaradio

Crystal Bindings For LuaRadio

Why

I have written an Audio Player called Sonicri in the Crystal language which plays audio files, internet radio, and podcasts. I wanted to add terrestrial FM and AM radio stations and discovered LuaRadio. These bindings enable me to embed suitable radio players into Sonicri.

Dependencies

1. LuaRadio (Installation instructions)
2. fftw3f
3. volk or liquid

Installation

Add this to your application's shard.yml:

dependencies:
  libluaradio:
    github: mjago/libluaradio

Usage

require "libluaradio"

See the examples for usage. The flow-graph is a Lua script. See LuaRadio project docs for more details.

Examples:

(Note: The examples decode a recorded IQ data file. Generally you would decode an SDR device plugged into a USB port, such as a cheap RTLSDR usb stick - see Ebay.)

First download an IQ recording data file called fm-capture.dat to the examples directory:

> wget -O examples/fm-capture.dat http://martynjago.co.uk/blog/audio/fm-capture.dat

Then run the examples

> crystal examples/wbfm1.cr
> crystal examples/wbfm2.cr
> crystal examples/wbfm_stereo.cr

Excellent documentation for the LuaRadio project can be viewed here

Debug:

To see debug info during play use the following:

> LUARADIO_DEBUG=1 crystal examples/wbfm_stereo.cr

Contributing

1. Fork it ( https://github.com/mjago/libluaradio/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• mjago mjago - creator, maintainer