Toggle a playlist using a HTTP callback

[toots]

Hi all!

This was a request from a user so here's a quick example about how to toggle a playlist using a http callback:

playlist = playlist("/tmp/pl")

play_from_playlist = ref(false)

def toggle_play_from_playlist(~protocol, ~data=_, ~headers=_, _) =
   play_from_playlist := not !play_from_playlist

   # Skip current track when switching away to make
   # sure we start on a fresh track next time!
   if not !play_from_playlist then
      playlist.skip()
   end

   http.response(
     protocol=protocol,
     code=200,
     data="Play from playlist: #{!play_from_playlist}"
   )
end

harbor.http.register(
  port=8000,method="PUT",
  "/toggle-play-from-playlist",
  toggle_play_from_playlist
)

failsafe = blank()

radio = switch(track_sensitive=false, [
  ({!play_from_playlist}, playlist),
  ({true}, failsafe)
])

output.ao(radio)

Then, using curl:

% curl -X PUT -v http://localhost:8000/toggle-play-from-playlist
*   Trying ::1...
* TCP_NODELAY set
* Connection failed
* connect to ::1 port 8000 failed: Connection refused
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8000 (#0)
> PUT /toggle-play-from-playlist HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Content-Length: 25
< Connection: close
<
* Closing connection 0
Play from playlist: true

A second time:

% curl -X PUT -v http://localhost:8000/toggle-play-from-playlist
*   Trying ::1...
* TCP_NODELAY set
* Connection failed
* connect to ::1 port 8000 failed: Connection refused
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8000 (#0)
> PUT /toggle-play-from-playlist HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Content-Length: 25
< Connection: close
<
* Closing connection 0
Play from playlist: false

Lastly:

curl -X PUT -v http://localhost:8000/toggle-play-from-playlist
*   Trying ::1...
* TCP_NODELAY set
* Connection failed
* connect to ::1 port 8000 failed: Connection refused
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8000 (#0)
> PUT /toggle-play-from-playlist HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Content-Length: 25
< Connection: close
<
* Closing connection 0
Play from playlist: true

And the playlist starts with a fresh song!

[smimram]

There are quite a few examples like this in the book :)

[Sebasti3n]

Bonjour,

Merci pour se partage du coup la commande nous devons lancer 2 fois pour que ça fonctionne ?
"curl -X PUT -v http://127.0.0.1:10200/toggle-play-from-playlist"
Cordialement

[Sebasti3n]

Bonjour @smimram et @toots,

Merci pour votre partage le script suivant ne fonctionne pas vraiment pour un point important :

• J'edite grâce à un crontab le fichier.pls
• Si le client precise que celle ci est forcer j'execute suite a l'etape 1 la commande :
  curl -X PUT -v http://127.0.0.1:10010/toggle-play-from-playlist
  2 fois sinon ça fonctionne pas
• le fichier playlist.pls étant modifier il devrait faire un next sur le premier titre de la nouvelle playlist
• malheureusement se n'est pas le cas il next sur le fichier suivant de la playlist precedente

Voici mon script :

`# Musique (repertoire ou se trouve les musiques)
myplaylist = playlist.safe(reload_mode="watch", mode="normal","/home/customers/radio/Vesta-31798/VertigeRadio/playlists/playlist.pls")
myplaylist = cue_cut(myplaylist)
myplaylist = crossfade(myplaylist)
myplaylist = mksafe(myplaylist)
#myplaylist = insert_metadata(myplaylist)

play_from_playlist = ref(false)

def toggle_play_from_playlist(~protocol, ~data=_, ~headers=_, _) =
   play_from_playlist := not !play_from_playlist

   # Skip current track when switching away to make
   # sure we start on a fresh track next time!
   if not !play_from_playlist then
     myplaylist.skip()
   end

   http.response(
     protocol=protocol,
     code=200,
     data="Play from playlist: #{!play_from_playlist}"
   )
end

harbor.http.register(
  port=10010,method="PUT",
  "/toggle-play-from-playlist",
  toggle_play_from_playlist
)

failsafe = blank()

radio = switch(track_sensitive=false, [
  ({!play_from_playlist}, myplaylist),
  ({true}, failsafe)
])


# Si il y a un probleme alors on lance la musique ci-dessous
security = single("/home/customers/radio/Vesta-31798/ftp/securite.mp3")

# On creer une variable radio
radio = myplaylist
radio = normalize(radio)

# Et la securite
radio = fallback(track_sensitive = false, [radio, security])

#Flux Live
live = fallback(track_sensitive=false, [input.http("http://127.0.0.1:8190/liveVertigeRadio")])

# On lance une ecoute pour voir si il y a un blanc pendant le live, si c'est le cas la playlist se relance
stream = fallback(track_sensitive=false, [strip_blank(max_blank=2.,live),radio])

# Information de diffusion
output.icecast(%mp3(bitrate=320),...


savez-vous comment faire en sorte que le next prenne en compte l'edition du fichier  playlist.pls ?

LOG au moment de la transition :

2021/08/28 00:55:03 [playlist_0:3] Reloading playlist with URI /home/customers/radio/Vesta-31798/VertigeRadio/playlists/playlist.pls.
2021/08/28 00:55:03 [lang:3] Unknown mime type, trying autodetection.
2021/08/28 00:55:03 [playlist_0:3] Prepared "/home/customers/radio/Vesta-31798/ftp/soso-maness-petrouchka.mp3" (RID 4).
2021/08/28 00:55:03 [cue_cut_0:3] End of track reached before cue-out point.
2021/08/28 00:55:03 [playlist_0:3] Reloading playlist with URI /home/customers/radio/Vesta-31798/VertigeRadio/playlists/playlist.pls

2021/08/28 00:55:03 [lang:3] Unknown mime type, trying autodetection.
[mp3float @ 0x7fb6585cab80] Could not update timestamps for skipped samples.
2021/08/28 00:55:03 [cue_cut_0:3] Cueing in...
2021/08/28 00:55:03 [crossfade_0:3] Analysis: -14.927671dB / -13.345350dB (4.96s / 4.96s)
2021/08/28 00:55:03 [crossfade_0:3] Simple transition: crossed, fade-in, fade-out.

`