This docker-compose.yml sample provides all of the services required to use a RTL-SDR usb dongle to tune into a FM HD radio -- or any analogue signal supported by ShinySDR (AM, FM, SSB, CW) -- and generate a streaming endpoint that can be consumed by a media player.
Your host machine passes the RTL-SDR device to an rtl_tcp server (dockerized example) which is accessible over TCP for tuning and getting signal.
One of the available tuners, nrsc5 for HD FM or ShinySDR for general use, accesses the rtl_tcp server and tunes/converts the analogue signal into uncompressed, digital audio.
NOTE: Only one tuner can be used at a time!
ffmpeg is used to convert uncompressed audio into an mp3/ogg stream which is then streamed to icecast at the URL of your choosing. The URL can then be directly accessed by multiple clients to get streaming audio.
yt-dlp is used alongside cron enabling you to schedule saving the stream at preset times and for an arbitrary duration.
You must determine the correct USB path to pass to the rtl_tcp service in order for it to access your radio device.
Run lsusb to get a list of USB devices attached to your host. It will look like this:
$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0032 Intel Corp. AX210 Bluetooth
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
...
Bus 005 Device 006: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Look for your device, it usually has RTL or DVB-T in the name. Use the Bus and Device identifiers to build the path to your usb device. EX:
Bus 005 Device 006: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
/dev/bus/usb/005/006
This is used in docker-compose.yml under rtl_tcp devices
YOU CAN ONLY USE ONE TUNER AT A TIME.
Either comment out the tuner block you do not want in docker-compose.yml or make sure you specify which services to bring up when running docker-compose.
nrsc5 is used to convert digital (HD) FM radio to a usable audio signal. This audio will have (almost) zero static and be a higher quality than the analogue audio signal for normal FM radio.
ShinySDR is a general purpose radio receiver with a web-based interface. It can play most analogue signals and decode many common digital signals. It cannot decode HD radio at this time.
The audio sent to Icecast will be whatever you have tuned ShinySDR to using the interface.
Reference docker-compose.yml to set the URL the tuners send audio to:
- nrsc5 =>
ICECAST_URL=icecast:8000/myradio - shiny =>
...icecast://source:hackme@icecast:8000/myradio
Change myradio to whatever you want the stream to be accessible at. The stream will be available at http://localhost:8000/myradio (or whatever you set)
If your docker installation is on a linux host you must set PUID and PGID environmental variables in the icecast_ytdl service in docker-compose.yml or the files generated will likely not be accessible.
To set the schedule edit /config/ytdl/crontabs/abc:
- set the cron expression
- edit downloading length
--download-sections "*0-20"in seconds IE*0-20= save the first two seconds of the stream