An attempt to create a RAOP (AirTunes) server in Node.js.
This project is highly work-in-progress - use it at your own risk!
Known compatibility issues:
- Currently this module will only compile on Node.js v0.10. Hopefully this will be fixed soon.
If using this module to output raw PCM audio to STDOUT, I've found the following useful:
I've tried quite a few different audio players but I've only managed to get sox to play back to PCM audio.
Install via Homebrew:
brew install sox
FFmpeg should also be able to parse PCM audio if you like that program better.
For standalone usage, run:
npm install --global raop-rtsp-server
For programmatic usage, run:
npm install raop-rtsp-server
speaker module can compile on your system, you should just be
able to start the server without any arguments:
If you'd rather pipe the PCM audio to another player, you can so so
raop-rtsp-server --stdout | sox -traw -L -c2 -r44100 -b16 -e signed-integer - -tcoreaudio
sox to be able to interpret the raw ALAC audio data, you need to
help it a little. These are the command line arguments given in the
-t raw- Set input type to
raw. This means that sox shouldn't expect any headers in the data - just raw audio
-L- The audio data is formatted using native byte ordering, which is little endian on Intel CPU's. Your system might use
-Bfor big endian
-c 2- Use 2 audio channels
-r 44100- Use a 44.1khz sample rate
-b 16- Use a bit-depth of 16
-e signed-integer- The audio encoding type
-- Set input source to STDIN
-t coreaudio- Set output type to
coreaudio(your system might differ, but this must always come after your input source)
To run in debug mode, use the
DEBUG environment variable:
The module can also be access programmatically:
var server =serversessionsserverstart name: 'NodeTunes'
server.start() function takes an optional options object:
name- The name that the RAOP server (this will be shown on your iDevices). Defaults to
port- The port that the server should listen on. Defaults to
session object emitted by the
new event is a readable stream and
will output raw PCM audio data.
volume- A float between 0 and 1 representing the current volume level (0 being muted and 1 being full volume)
volumeDb- A float value representing the audio attenuation in dB. It ranges from
0(highest). A special number
Besides the normal readable stream API, the session also emits the following events:
Emitted when ever the client changes the volume. The value emitted is
the volume as a float value representing the audio attenuation in dB. It
-30 (lowest) to
0 (highest). A special number