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(*****************************************************************************
Liquidsoap, a programmable stream generator.
Copyright 2003-2024 Savonet team
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details, fully stated in the COPYING
file at the root of the liquidsoap distribution.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************)
(** Plug for playlist parsing, in which [src/playlists] plugins come. *)
module Http = Liq_http
let log = Log.make ["playlist parser"]
let conf_playlist =
Dtools.Conf.void ~p:(Configure.conf#plug "playlist") "Playlist formats"
let conf_cue_in_metadata =
Dtools.Conf.string
~p:(conf_playlist#plug "cue_in_metadata")
~d:"liq_cue_in" "Cue in metadata for playlists with track index."
~comments:
[
"Some playlists format, such as CUE files specify index points to start";
"tracks playback. In this case, tracks are resolved to a annotate: \
request with";
"a cue-in metadata containing the index. If you want to make use of \
this index,";
"you should specify here what label you want for this metadata.";
]
let conf_cue_out_metadata =
Dtools.Conf.string
~p:(conf_playlist#plug "cue_out_metadata")
~d:"liq_cue_out" "Cue out metadata for playlists with track index."
~comments:
[
"Some playlists format, such as CUE files specify index points to start";
"tracks playback. In this case, tracks are resolved to a annotate: \
request with";
"a cue-in metadata containing the index. If you want to make use of \
this index,";
"you should specify here what label you want for this metadata.";
]
(** A playlist is list of metadatas,uri *)
type playlist = ((string * string) list * string) list
type parser = ?pwd:string -> string -> playlist
(** A plugin is a boolean and a parsing function *)
type plugin = {
mimes : string list;
(* true if the format can be automatically detected *)
strict : bool;
(* The parser is expected to respect the order
of the files in the playlist. *)
parser : parser;
}
(** Parsers are given a string and return a list of metadatas,uri, if possible.
*)
let parsers : plugin Plug.t =
Plug.create ~doc:"Method to parse playlist." "playlist formats"
let get_file ?pwd file =
match pwd with
| Some pwd ->
if Http.is_url pwd && not (Http.is_url file) then pwd ^ file
else (
let f = Filename.concat pwd file in
if Sys.file_exists f then f else file)
| None -> file
exception Exit of (string * playlist)
(** Get a valid parser for [string]. The validity is not based on file type but
only on success of the parser instantiation. Being based on file extension
is weak, and troublesome when accessing a remote file -- that would force us
to create a local temporary file with the same extension. *)
let search_valid ?pwd string =
try
let plugins = Plug.list parsers in
(* Try strict plugins first *)
let compare (_, a) (_, b) = compare b.strict a.strict in
let plugins = List.sort compare plugins in
List.iter
(fun (format, plugin) ->
log#info "Trying %s parser" format;
match try Some (plugin.parser ?pwd string) with _ -> None with
| Some d -> raise (Exit (format, d))
| None -> ())
plugins;
log#important "No format found";
raise Not_found
with Exit (format, d) -> (format, d)
|
