Table of contents
Radio
This skill implementation follows steps explained on the intro page to create a radio station. A running mpd (music player daemon) server is required.
- Provide radio output
- Skip between radio stations
- Radio out can be paused and resumed
Radio station implementation
Music player daemon installation
cd ~
mkdir radio
cd radio
sudo apt-get -y install mpd mpc # install music player daemon
Adding a radio playlist
mkdir playlists
cd playlists
Create a file containing radio station URLs. Only radio stations with auto play on, are allowed in this file. Find a list of german radio station’s here.
Download the station file used in this project here.
nano radiostations.m3u
Edit mpd’s configuration file to use the previously created playlist, allow Node-RED to access mpd’s websocket and set the default sound device to be used as output.
sudo nano /etc/mpd.conf
- Set
playlist_directoryto/home/pi/radio/playlists - Set
bind_to_addresstoany - Set
follow_outside_symlinkstoyes - Set
aollow_inside_symlinkstoyes - Set the default audio device
audio_output {
type "alsa"
name "My ALSA Device"
device "sysdefault:CARD=Headphones" # default sound device plugged into the 3.5mm jack
# mixer_type "hardware"
# mixer_device "default"
mixer_control "PCM"
# mixer_index "0"
}
Restart your Pi before proceeding.
sudo restart
Your radio playlist is now ready to be used. Here is a list of terminal commands to interact with your radio station.
mpc clear # to clear the database
mpc load radiostations # to load the file containing your URLs
mpc play # to start playing the radiostations in that file from the start
mpc stop # to stop the radio from playing
mpc status # to see the player's status, including what station and what song is currently playing
Add intents
[StartRadio]
mach das radio an
radio an
[StopRadio]
mach das radio aus
radio aus
[NextRadio]
nächster sender
nächste station
[PrevRadio]
vorherige station
zurück
After training click View and then Confirm Guesses to accept pronunciation for unknown words.
Example sentences
1. mach das radio an (turn the radio on)
2. mach das radio aus (turn the radio off)
3. nächster sender (skip to the next station)
4. vorherige sation (skip to the previous station)
Node-RED flow creation
The music player daemon come with its own custom Node-RED node. The node can be downloaded by accessing Node-RED’s header menu an clicking on manage palette, search for mpd and press install. The node take inputs similar to the terminal commands mentioned above. Make sure to set the mpd server to <pi-ip>:6600
The web socket in node waits for an intent to be spoken. After an intent is recognized a json structured payload is passed to the first switch called check intent. This switch passes the information to the next node depending on the intent name associated with the spoken intent. The function nodes contain javascript code, responsible for preparing mpd commands.
Download the json file associated with this flow and import it into Node-RED using the header menu to get a deeper look into this skill.
JSON
[
{
"id": "a65a3a94.635d98",
"type": "tab",
"label": "Radio",
"disabled": false,
"info": ""
},
{
"id": "37099153.cea5fe",
"type": "switch",
"z": "a65a3a94.635d98",
"name": "check intent",
"property": "intent.name",
"propertyType": "msg",
"rules": [
{
"t": "eq",
"v": "StartRadio",
"vt": "str"
},
{
"t": "eq",
"v": "StopRadio",
"vt": "str"
},
{
"t": "eq",
"v": "NextRadio",
"vt": "str"
},
{
"t": "eq",
"v": "PrevRadio",
"vt": "str"
}
],
"checkall": "false",
"repair": false,
"outputs": 4,
"x": 390,
"y": 480,
"wires": [
[
"662066d6.989f48"
],
[
"50c4049.493b47c"
],
[
"d5e23fa3.ebb8c"
],
[
"e0a6ed62.e089a"
]
]
},
{
"id": "44c01fb6.28dc9",
"type": "mpd out",
"z": "a65a3a94.635d98",
"name": "",
"topic": "",
"server": "9a410553.e09e3",
"x": 980,
"y": 460,
"wires": [
[]
]
},
{
"id": "b4e35915.2663c8",
"type": "function",
"z": "a65a3a94.635d98",
"name": "on",
"func": "return msg = {payload : \"play\"};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 890,
"y": 380,
"wires": [
[
"44c01fb6.28dc9"
]
]
},
{
"id": "50c4049.493b47c",
"type": "function",
"z": "a65a3a94.635d98",
"name": "off",
"func": "return msg = {payload : \"stop\"};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 570,
"y": 460,
"wires": [
[
"44c01fb6.28dc9",
"6a0f4fa7.6115a8"
]
]
},
{
"id": "d5e23fa3.ebb8c",
"type": "function",
"z": "a65a3a94.635d98",
"name": "next",
"func": "return msg = {payload : \"next\"};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 570,
"y": 500,
"wires": [
[
"44c01fb6.28dc9"
]
]
},
{
"id": "6a0f4fa7.6115a8",
"type": "function",
"z": "a65a3a94.635d98",
"name": "clear",
"func": "return msg = {payload : \"clear\"};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 730,
"y": 440,
"wires": [
[
"44c01fb6.28dc9"
]
]
},
{
"id": "662066d6.989f48",
"type": "function",
"z": "a65a3a94.635d98",
"name": "load",
"func": "return msg = {payload : \"load radiostations\"};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 570,
"y": 420,
"wires": [
[
"44c01fb6.28dc9",
"e58a2ff3.691f78"
]
]
},
{
"id": "e58a2ff3.691f78",
"type": "function",
"z": "a65a3a94.635d98",
"name": "repeat",
"func": "return msg = {payload : \"repeat 1\"};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 730,
"y": 400,
"wires": [
[
"b4e35915.2663c8",
"44c01fb6.28dc9"
]
]
},
{
"id": "e0a6ed62.e089a",
"type": "function",
"z": "a65a3a94.635d98",
"name": "prev",
"func": "return msg = {payload : \"previous\"};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 570,
"y": 540,
"wires": [
[
"44c01fb6.28dc9"
]
]
},
{
"id": "d73f5b04.9b3e6",
"type": "websocket in",
"z": "a65a3a94.635d98",
"name": "rhasspy in",
"server": "5999adec.e962a4",
"client": "",
"x": 160,
"y": 480,
"wires": [
[
"37099153.cea5fe"
]
]
},
{
"id": "9a410553.e09e3",
"type": "mpd-server",
"host": "192.168.0.177",
"port": "6600"
},
{
"id": "5999adec.e962a4",
"type": "websocket-listener",
"path": "ws://192.168.0.177:12101/api/events/intent",
"wholemsg": "true"
}
]