Prioritize, use file decoders file extensions when computing request

duration.

src/core/decoder/external_decoder.ml

@@ -120,13 +120,18 @@ let register_stdin ~name ~doc ~priority ~mimes ~file_extensions ~test process =
       stream_decoder = Some (fun ~ctype:_ _ -> create_stream process);
     };
 
-  let duration ~metadata:_ filename =
+  let dresolver ~metadata:_ filename =
     let process =
       Printf.sprintf "cat %s | %s" (Filename.quote filename) process
     in
     duration process
   in
-  Plug.register Request.dresolvers name ~doc duration
+  Plug.register Request.dresolvers name ~doc
+    {
+      dpriority = (fun () -> priority);
+      file_extensions = (fun () -> Option.value ~default:[] file_extensions);
+      dresolver;
+    }
 
 (** Now an external decoder that directly operates
   * on the file. The remaining time in this case
@@ -196,5 +201,10 @@ let register_oblivious ~name ~doc ~priority ~mimes ~file_extensions ~test
       stream_decoder = None;
     };
 
-  let duration ~metadata:_ filename = duration (process filename) in
-  Plug.register Request.dresolvers name ~doc duration
+  let dresolver ~metadata:_ filename = duration (process filename) in
+  Plug.register Request.dresolvers name ~doc
+    {
+      dpriority = (fun () -> priority);
+      file_extensions = (fun () -> Option.value ~default:[] file_extensions);
+      dresolver;
+    }

src/core/decoder/ffmpeg_decoder.ml

@@ -546,7 +546,7 @@ let parse_file_decoder_args metadata =
     | Some args -> parse_input_args args
     | None -> ([], None)
 
-let duration ~metadata file =
+let dresolver ~metadata file =
   let args, format = parse_file_decoder_args metadata in
   let opts = Hashtbl.create 10 in
   List.iter (fun (k, v) -> Hashtbl.replace opts k v) args;
@@ -558,10 +558,16 @@ let duration ~metadata file =
       Option.map (fun d -> Int64.to_float d /. 1000.) duration)
 
 let () =
-  Plug.register Request.dresolvers "ffmepg" ~doc:"" (fun ~metadata fname ->
-      match duration ~metadata fname with
-        | None -> raise Not_found
-        | Some d -> d)
+  Plug.register Request.dresolvers "ffmepg" ~doc:""
+    {
+      dpriority = (fun () -> priority#get);
+      file_extensions = (fun () -> file_extensions#get);
+      dresolver =
+        (fun ~metadata fname ->
+          match dresolver ~metadata fname with
+            | None -> raise Not_found
+            | Some d -> d);
+    }
 
 let tags_substitutions = [("track", "tracknumber")]
 
@@ -1087,7 +1093,7 @@ let mk_streams ~ctype ~decode_first_metadata container =
 
 let create_decoder ~ctype ~metadata fname =
   let args, format = parse_file_decoder_args metadata in
-  let file_duration = duration ~metadata fname in
+  let file_duration = dresolver ~metadata fname in
   let remaining = Atomic.make file_duration in
   let set_remaining ~pts ~duration stream =
     let pts =

src/core/decoder/liq_flac_decoder.ml

@@ -184,7 +184,7 @@ let check filename =
     true
   with _ -> false
 
-let duration ~metadata:_ file =
+let dresolver ~metadata:_ file =
   if not (check file) then raise Not_found;
   let fd = Decoder.openfile file in
   Fun.protect
@@ -199,4 +199,8 @@ let duration ~metadata:_ file =
 
 let () =
   Plug.register Request.dresolvers "flac" ~doc:"Compute duration of flac files."
-    duration
+    {
+      dpriority = (fun () -> priority#get);
+      file_extensions = (fun () -> file_extensions#get);
+      dresolver;
+    }

src/core/decoder/mad_decoder.ml

@@ -189,11 +189,16 @@ let check filename =
     true
   with _ -> false
 
-let duration ~metadata:_ file =
+let dresolver ~metadata:_ file =
   if not (check file) then raise Not_found;
   let ans = Mad.duration file in
   match ans with 0. -> raise Not_found | _ -> ans
 
 let () =
   Plug.register Request.dresolvers "mad"
-    ~doc:"Compute duration of mp3 files using MAD library." duration
+    ~doc:"Compute duration of mp3 files using MAD library."
+    {
+      dpriority = (fun () -> priority#get);
+      file_extensions = (fun () -> file_extensions#get);
+      dresolver;
+    }

src/core/decoder/ogg_flac_duration.ml

@@ -22,7 +22,7 @@
 
 (** Read duration of ogg/flac files. *)
 
-let duration ~metadata:_ file =
+let dresolver ~metadata:_ file =
   let sync, fd = Ogg.Sync.create_from_file file in
   Fun.protect
     ~finally:(fun () -> Unix.close fd)
@@ -63,4 +63,10 @@ let duration ~metadata:_ file =
       if samples <= 0. then raise Not_found;
       samples /. float info.Flac.Decoder.sample_rate)
 
-let () = Plug.register Request.dresolvers "ogg/flac" ~doc:"" duration
+let () =
+  Plug.register Request.dresolvers "ogg/flac" ~doc:""
+    {
+      dpriority = (fun () -> Liq_ogg_decoder.priority#get);
+      file_extensions = (fun () -> Liq_ogg_decoder.file_extensions#get);
+      dresolver;
+    }

src/core/decoder/vorbisduration.ml

@@ -22,10 +22,16 @@
 
 (** Read duration of ogg/vorbis files. *)
 
-let duration ~metadata:_ file =
+let dresolver ~metadata:_ file =
   let dec, fd = Vorbis.File.Decoder.openfile file in
   Fun.protect
     ~finally:(fun () -> Unix.close fd)
     (fun _ -> Vorbis.File.Decoder.duration dec (-1))
 
-let () = Plug.register Request.dresolvers "vorbis" ~doc:"" duration
+let () =
+  Plug.register Request.dresolvers "vorbis" ~doc:""
+    {
+      dpriority = (fun () -> Liq_ogg_decoder.priority#get);
+      file_extensions = (fun () -> Liq_ogg_decoder.file_extensions#get);
+      dresolver;
+    }

src/core/decoder/wav_aiff_decoder.ml

@@ -219,14 +219,19 @@ let () =
     }
 
 let () =
-  let duration ~metadata:_ file =
+  let dresolver ~metadata:_ file =
     let w = Wav_aiff.fopen file in
     let ret = Wav_aiff.duration w in
     Wav_aiff.close w;
     ret
   in
   Plug.register Request.dresolvers "wav/aiff"
-    ~doc:"Native computation of wav and aiff files duration." duration
+    ~doc:"Native computation of wav and aiff files duration."
+    {
+      dpriority = (fun () -> aiff_priorities#get);
+      file_extensions = (fun () -> aiff_file_extensions#get);
+      dresolver;
+    }
 
 let basic_mime_types =
   Dtools.Conf.list

src/core/request.ml

@@ -121,20 +121,59 @@ let status { status } = Atomic.get status
 let indicator ?(metadata = Frame.Metadata.empty) ?temporary s =
   { uri = home_unrelate s; temporary = temporary = Some true; metadata }
 
-(** Length *)
+type dresolver = {
+  dpriority : unit -> int;
+  file_extensions : unit -> string list;
+  dresolver : metadata:Frame.metadata -> string -> float;
+}
+
 let dresolvers_doc = "Methods to extract duration from a file."
 
-let dresolvers = Plug.create ~doc:dresolvers_doc "audio file formats (duration)"
+let conf_dresolvers =
+  Dtools.Conf.list ~p:(conf#plug "dresolvers") ~d:[]
+    "Methods to extract file duration."
+
+let f c v =
+  match c#get_d with
+    | None -> c#set_d (Some [v])
+    | Some d -> c#set_d (Some (d @ [v]))
+
+let dresolvers =
+  Plug.create ~doc:dresolvers_doc
+    ~register_hook:(fun name _ -> f conf_dresolvers name)
+    "audio file formats (duration)"
+
+let get_dresolvers ~file () =
+  let extension = try Utils.get_ext file with _ -> "" in
+  let f cur name =
+    match Plug.get dresolvers name with
+      | Some ({ file_extensions } as p)
+        when List.mem extension (file_extensions ()) ->
+          (name, p) :: cur
+      | Some _ -> cur
+      | None ->
+          log#severe "Cannot find duration resolver %s" name;
+          cur
+  in
+  let resolvers = List.fold_left f [] conf_dresolvers#get in
+  List.sort
+    (fun (_, a) (_, b) -> compare (b.dpriority ()) (a.dpriority ()))
+    resolvers
 
 let compute_duration ~metadata file =
   try
-    Plug.iter dresolvers (fun _ resolver ->
+    List.iter
+      (fun (name, { dpriority; dresolver }) ->
         try
-          let ans = resolver ~metadata file in
+          log#info "Trying duration resolver %s (priority: %d) for file %s.."
+            name (dpriority ())
+            (Lang_string.quote_string file);
+          let ans = dresolver ~metadata file in
           raise (Duration ans)
         with
           | Duration e -> raise (Duration e)
-          | _ -> ());
+          | _ -> ())
+      (get_dresolvers ~file ());
     raise Not_found
   with Duration d -> d
 

src/core/request.mli

@@ -113,6 +113,9 @@ type resolve_flag = [ `Resolved | `Failed | `Timeout ]
 (** Metadata resolvers priorities. *)
 val conf_metadata_decoder_priorities : Dtools.Conf.ut
 
+(** Read the request's metadata. *)
+val read_metadata : t -> unit
+
 (** [resolve request timeout] tries to resolve the request within
     [timeout] seconds. *)
 val resolve : t -> float -> resolve_flag
@@ -165,8 +168,14 @@ val done_playing : source:Source.source -> t -> unit
 
 (** {1 Plugs} *)
 
+type dresolver = {
+  dpriority : unit -> int;
+  file_extensions : unit -> string list;
+  dresolver : metadata:Frame.metadata -> string -> float;
+}
+
 (** Functions for computing duration. *)
-val dresolvers : (metadata:Frame.metadata -> string -> float) Plug.t
+val dresolvers : dresolver Plug.t
 
 (** Type for a metadata resolver. Resolvers are executed in priority
     order and the first returned metadata take precedence over any other