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(*****************************************************************************
Liquidsoap, a programmable audio stream generator.
Copyright 2003-2011 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************)
(* Video format converters *)
let log = Dtools.Log.make ["video";"converter"]
(* TODO: is it the good place for this ? *)
let video_conf =
Dtools.Conf.void ~p:(Configure.conf#plug "video") "Video settings"
~comments:["Options related to video."]
let video_converter_conf =
Dtools.Conf.void ~p:(video_conf#plug "converter") "Video conversion"
~comments:["Options related to video conversion."]
let preferred_converter_conf =
Dtools.Conf.string ~p:(video_converter_conf#plug "preferred") ~d:"gavl"
"Preferred video converter"
let proportional_scale_conf =
Dtools.Conf.bool ~p:(video_converter_conf#plug "proportional_scale") ~d:true
"Preferred proportional scale."
module Img = Image.Generic
(** [~proportional src dst] performs the
* conversion from frame src to frame dst.
* raises Not_found if no conversion routine
* was found *)
type converter = proportional:bool -> Img.t -> Img.t -> unit
(** A converter plugin is a name, a list of input formats,
* a list of output formats,
* a fonction to create a converter. *)
type converter_plug = (Img.Pixel.format list)*(Img.Pixel.format list)*(unit->converter)
let video_converters : converter_plug Plug.plug =
Plug.create ~doc:"Methods for converting video frames." "video converters"
exception Exit of converter
(** Only log preferred decoder availability once at start. *)
let () =
ignore(Dtools.Init.at_start
(fun () ->
let preferred = preferred_converter_conf#get in
match video_converters#get preferred with
| None ->
log#f 4 "Couldn't find preferred video converter: %s." preferred
| _ -> log#f 4 "Using preferred video converter: %s." preferred))
let find_converter src dst =
try
begin
let preferred = preferred_converter_conf#get in
match video_converters#get preferred with
| None -> ()
| Some (sf,df,f) ->
if List.mem src sf && List.mem dst df then
raise (Exit (f ()))
else
log#f 4 "Default video converter %s cannot do %s->%s."
preferred
(Img.Pixel.string_of_format src)
(Img.Pixel.string_of_format dst)
end;
List.iter
(fun (name,(sf,df,f)) ->
log#f 4 "Trying %s video converter..." name ;
if List.mem src sf && List.mem dst df then
raise (Exit (f ()))
else ())
video_converters#get_all;
log#f 4 "Couldn't find a video converter from format %s to format %s."
(Img.Pixel.string_of_format src)
(Img.Pixel.string_of_format dst);
raise Not_found
with
| Exit x -> x ~proportional:proportional_scale_conf#get
|