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RTL SDR FM Streamer

Turns your Realtek RTL2832 based DVB dongle into a FM radio stereo receiver.

Description

RTL SDR FM Streamer is a small tool to stream FM stereo radio by using a DVB-T dongle to a client e.g Kodi, VLC or mplayer.

The DVB-T dongle has to be based on the Realtek RTL2832U. See http://sdr.osmocom.org/trac/wiki/rtl-sdr for more RTL SDR details.

Usage

Default port: 2346

$ ./rtl_fm_streamer

Docker Image

Thanks to mrbluebrett you can also use a Docker image https://hub.docker.com/r/mrbluebrett/rtl_fm_streamer

Options

The options "-P" defines the port where the HTTP server is listen on.

e.g. port 12345

$ ./rtl_fm_streamer -P 12345

Streaming

To connect to the server you can use KODI, VLC or mplayer. Just connect to the URL

mono: "http://IP:port/FrequencyInHerz"
mono: "http://IP:port/FrequencyInHerz/0"
stereo: "http://IP:port/FrequencyInHerz/1"

To use this tool in KODI simply create a *.strm file e.g. "FM_93_2.strm"

http://localhost:2346/93200000

JSON-RPC API

rtl_fm_streamer comes with a JSON-RPC 1.0 API. It is listening at port 2345 but you can specify the port with the parameter "-j".

$ ./rtl_fm_streamer -j 1234

Provided methods

Method Parameters Return Description
SetFrequency Frequency in Hz Frequency in Hz Tunes to a given frequency
GetPowerLevel None Power level in DBFS Returns the current power level in DBFS

Example Set Frequency client --> rtl_fm_streamer

{"method": "SetFrequency", "params": [93200000]}

rtl_fm_streamer --> client

{"result": [93200000]}

Performance

Mono: Should run on many small devices. e.g. a Raspberry Pi 1. Stereo: Needs a lot of more CPU power compared to mono (tested on a Raspberry Pi 2). On modern PCs (x86, x64) mono and stereo decoding should be possible easily (tested with an Intel CORE i7 and an Intel CORE 2 Duo)

Limitations

  • Server accepts only one client

Known Problems

  • Occasional segmentation faults after disconnect of a client

Building

To compile rtl_fm_streamer just do the following steps (install git, cmake and libev first).

$ sudo apt-get install build-essential libusb-1.0-0-dev libev-dev
$ git clone https://github.com/AlbrechtL/rtl_fm_streamer.git
$ cd rtl_fm_streamer/
rtl_fm_streamer$ mkdir build
rtl_fm_streamer$ cd build
rtl_fm_streamer/build$ cmake ../
rtl_fm_streamer/build$ make

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Support

OpenELEC thread: http://openelec.tv/forum/126-3rd-party/75537-fm-radio-receiver-for-kodi-for-the-raspberry-pi-1 raspberrypi.org thread: https://www.raspberrypi.org/forums/viewtopic.php?f=38&t=122372

Write me an e-mail: Albrecht [email protected]

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Software to turn the RTL2832U into an SDR

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