2 Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 /** @file src/decoder.h
23 * @brief Decoder class.
27 #ifndef DCPOMATIC_DECODER_H
28 #define DCPOMATIC_DECODER_H
31 #include "dcpomatic_time.h"
33 #include "weak_film.h"
34 #include <boost/utility.hpp>
46 * @brief Parent class for decoders of content.
48 class Decoder : public WeakConstFilm
51 Decoder (std::weak_ptr<const Film> film);
52 virtual ~Decoder () {}
54 Decoder (Decoder const&) = delete;
55 Decoder& operator= (Decoder const&) = delete;
57 std::shared_ptr<VideoDecoder> video;
58 std::shared_ptr<AudioDecoder> audio;
59 std::list<std::shared_ptr<TextDecoder>> text;
60 std::shared_ptr<AtmosDecoder> atmos;
62 std::shared_ptr<TextDecoder> only_text () const;
69 OK, ///< there was no error and more data may be emitted on the next pass()
70 FINISHED, ///< this decoder will emit no more data unless a seek() happens
71 ERROR, ///< some survivable error occurred; output may not be correct
74 static PassResult ok() {
78 static PassResult finished() {
79 return { Type::FINISHED };
82 static PassResult error(std::string message) {
83 return { Type::ERROR, message };
87 return _type == Type::OK;
90 bool is_finished() const {
91 return _type == Type::FINISHED;
94 bool is_error() const {
95 return _type == Type::ERROR;
98 std::string error_message() const {
99 DCPOMATIC_ASSERT(is_error());
100 return _error_message;
104 PassResult(Type type)
108 PassResult(Type type, std::string error_message)
110 , _error_message(error_message)
114 std::string _error_message;
117 /** Do some decoding and perhaps emit video, audio or subtitle data */
118 virtual PassResult pass() = 0;
119 virtual void seek (dcpomatic::ContentTime time, bool accurate);
121 virtual dcpomatic::ContentTime position () const;