[Playlist] Nested Playlists, Embedded Fields (was: We need to reset the site

[Erica Louise]

Why am I on this???? 

Sent from my iPhone

> On Aug 30, 2021, at 5:10 PM, Kace Ong <kaceong at gmail.com> wrote:
> 
> Since I see that my old questions from 22-Jul-2015 has been added to
> the gitlab issues
> (https://gitlab.xiph.org/boehs/xpsf-spec/-/issues/3), please allow me
> to add more context to my issue.
> 
> The original question is whether XSPF allows custom tags and nesting
> of playlists.
> 
> 1. Playlist of playlists: say song A, B, C are a group file, and song
> D, E, F are another group file.  Then I may want to be able to create
> a third file that simply refers file 1 and 2 as child objects, without
> having to explicitly write out their contents.
> 
> 2. Within the definition of a playlist sequence, a song is defined by
> an absolute location/URL.  Sometimes this is undesirable, e.g. if the
> song's absolute location cannot be determined.  For instance, a set of
> song files on a portable storage is sometimes mounted on D: drive on
> one PC, and as F: drive on another PC.  This breaks the playlist.
> 
>  - 2a. So sometimes what is desirable is to have a file location
> which is resolvable at runtime.  This may mean some extra user defined
> fields in XSPF specs, e.g. a custom field called DRIVENAME=D and
> allowing file locations to be expressions.
> 
>  - 2b. In the world of online music, due to various rights and
> permissions concern, a song repository may be linked only temporarily
> at https://mymusic.com.  This means any playlist pointing to this
> repository has to resolve the domain name.  It is then easier to have
> a custom field called REPOSITORY=https://mymusic.com instead of that
> string in every song address.
> 
>  - 2c. Both 2a/2b cases can be just a macro or variable substitution.
> But here is another situation that is possibly more complex.  A DJ at
> location 1 wants to play his music at location 2 remotely, which is a
> fairly common scenario in today's world.  Usually he sends the
> compressed audios from location 1 to 2.  But what if he sends his
> playlist instead and have it executed at location 2?  Then the remote
> side gets to hear full resolution music.  But this can work only if
> playlists can travel and still resolve resource addresses correctly.
> 
> 3. For the advanced music hackers, can we use scripts to automate
> playlists?  A case example would be a Karaoke, which has a music and a
> lyric components that need to sync with each other.  Another case
> example is a lecture, where we want the sequence to pause at a point
> until the user presses a key to continue. A playlist is essentially a
> script, but currently the script only has the power of a simple
> sequence and no conditional / subroutine / parameters.  How to create
> more flexibility?
> 
>  - 3a. One example application could be to export playlists that
> mixes Spotify and Youtube music.  Each has a different URL scheme, and
> some tricks are needed to export their playlists which are custom
> formatted.  Exporting them to XSPF may require custom tags specific to
> each.
> 
> Possibly one simple solution is to combine a powerful scripting
> language (like python) with XSPF as a data structure. But XSPF should
> define the behaviour of undefined or unknown tags and provide test
> suites.
> 
> p.s. I am not aware what is the problem with Mailman, other than a
> very old user interface. Obviously Gitlab can be an improvement  but
> only if you know how to use it.
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