Lisa Compact
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6.2.2
Limitations of online playlists
Playing the entries of a playlist in random order is only possible for playlists that are stored on the SD
card (see
). However, online playlists are retrieved from the web server and played
immediately. They are not stored on the SD card and therefore random order playback of the entries is
not supported.
6.3
Single track playlist
If the music and commercial program for a day has been planned, changes may be required during that
day. For this purpose the concept of 'single track playlist' is developed: It allows for changes in the
music and commercial programming while the program is executed. For example, a preplanned
commercial may be canceled since the stores run out of stock.
Additionally, using the single track playlist method allows to plan a single music program for a group of
stores, while commercials are planned for each store separately. For example, all stores get the 'Hard
core lounge' playlist, while stores 1-3 get commercial A, and stores 4-6 get commercial B.
Single track playlist works as follows:
·
The URL of a preset on the Lisa points to an online playlist, like this preset:
o
Preset name: 'Ambient music'
o
Preset URL: 'http://myServer/myPlaylist.pls
·
When the Lisa starts, it makes an HTTP request to the preset URL
·
The server returns the playlist, which contains one single entry, which points to an audio track, e.g.,
[playlist]
File1=http://myServer/audio/myAudioFile3.mp3
Title1=Online audio track
Length1=180
NumberOfEntries=1
Version=2
·
The Lisa plays this track
·
When a track has been played until the end, the playlist is finished and the Lisa again makes an
HTTP request for the preset URL
·
Again the server returns a playlist, now containing the next track or commercial according to the
program that has been planned
This setup allows you to change the program 'on the fly', even while the Lisa is playing the program.
Each time the Lisa requests a playlist, the server will base the response (the returned playlist) on the
latest version of the program and the Lisa will (therefore) follow the new planning/program.
