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(*
* Copyright 2007-2011 Savonet team
*
* This file is part of ocaml-theora.
*
* ocaml-theora 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.
*
* ocaml-theora 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.
*
* You should have received a copy of the GNU General Public License
* along with ocaml-theora; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
let check = Theora.Decoder.check
let decoder ~fill:_ os =
let decoder = Theora.Decoder.create () in
let data = ref None in
let latest_yuv = ref None in
let os = ref os in
let init () =
match !data with
| Some (dec, info, m) -> (dec, info, m)
| None ->
let packet = Ogg.Stream.get_packet !os in
let decoder, info, vendor, m =
Theora.Decoder.headerin decoder packet
in
let meta = (vendor, m) in
data := Some (decoder, info, meta);
(decoder, info, meta)
in
let decode feed =
let decoder, info, _ = init () in
let ret =
try
let yuv = Theora.Decoder.get_yuv decoder !os in
latest_yuv := Some yuv;
yuv
with Theora.Duplicate_frame -> (
match !latest_yuv with
| Some yuv -> yuv
| None -> raise Theora.Internal_error)
in
let format =
match info.Theora.pixel_fmt with
| Theora.PF_420 -> Ogg_decoder.Yuvj_420
| Theora.PF_reserved -> assert false
| Theora.PF_422 -> Ogg_decoder.Yuvj_422
| Theora.PF_444 -> Ogg_decoder.Yuvj_444
in
let ret =
{
Ogg_decoder.format;
frame_width = info.Theora.frame_width;
frame_height = info.Theora.frame_height;
y_stride = ret.Theora.y_stride;
uv_stride = ret.Theora.u_stride;
y = ret.Theora.y;
u = ret.Theora.u;
v = ret.Theora.v;
}
in
feed ret
in
let info () =
let _, info, m = init () in
( {
Ogg_decoder.fps_numerator = info.Theora.fps_numerator;
fps_denominator = info.Theora.fps_denominator;
width = info.Theora.frame_width;
height = info.Theora.frame_height;
},
m )
in
let restart ~fill:_ new_os = os := new_os in
let samples_of_granulepos pos =
let decoder, _, _ = init () in
Theora.Decoder.frames_of_granulepos decoder pos
in
Ogg_decoder.Video
{
Ogg_decoder.name = "theora";
info;
decode;
restart;
samples_of_granulepos;
}
let register () = Hashtbl.add Ogg_decoder.ogg_decoders "theora" (check, decoder)
|
