2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/asset.cc
21 * @brief Parent class for assets of DCPs made up of MXF files.
25 #include <boost/filesystem.hpp>
26 #include <boost/lexical_cast.hpp>
27 #include <libxml++/nodes/element.h>
34 #include "exceptions.h"
40 using boost::shared_ptr;
41 using boost::lexical_cast;
42 using boost::dynamic_pointer_cast;
45 MXF::MXF (boost::filesystem::path file)
48 , _encryption_context (0)
49 , _decryption_context (0)
57 delete _encryption_context;
58 delete _decryption_context;
62 MXF::fill_writer_info (ASDCP::WriterInfo* writer_info)
64 writer_info->ProductVersion = _metadata.product_version;
65 writer_info->CompanyName = _metadata.company_name;
66 writer_info->ProductName = _metadata.product_name.c_str();
69 writer_info->LabelSetType = ASDCP::LS_MXF_INTEROP;
71 writer_info->LabelSetType = ASDCP::LS_MXF_SMPTE;
74 Kumu::hex2bin (_id.c_str(), writer_info->AssetUUID, Kumu::UUID_Length, &c);
75 assert (c == Kumu::UUID_Length);
78 Kumu::GenRandomUUID (writer_info->ContextID);
79 writer_info->EncryptedEssence = true;
82 Kumu::hex2bin (_key_id.c_str(), writer_info->CryptographicKeyID, Kumu::UUID_Length, &c);
83 assert (c == Kumu::UUID_Length);
88 MXF::equals (shared_ptr<const Content> other, EqualityOptions opt, boost::function<void (NoteType, string)> note) const
90 if (!Content::equals (other, opt, note)) {
94 shared_ptr<const MXF> other_mxf = dynamic_pointer_cast<const MXF> (other);
96 note (ERROR, "comparing an MXF asset with a non-MXF asset");
100 if (_file != other_mxf->file ()) {
101 note (ERROR, "MXF names differ");
102 if (!opt.mxf_names_can_differ) {
111 MXF::write_to_cpl (xmlpp::Element* node) const
113 pair<string, string> const attr = cpl_node_attribute ();
114 xmlpp::Element* a = node->add_child (cpl_node_name ());
115 if (!attr.first.empty ()) {
116 a->set_attribute (attr.first, attr.second);
118 a->add_child ("Id")->add_child_text ("urn:uuid:" + _id);
119 a->add_child ("AnnotationText")->add_child_text (_file.string ());
120 a->add_child ("EditRate")->add_child_text (lexical_cast<string> (_edit_rate) + " 1");
121 a->add_child ("IntrinsicDuration")->add_child_text (lexical_cast<string> (_intrinsic_duration));
122 a->add_child ("EntryPoint")->add_child_text (lexical_cast<string> (_entry_point));
123 a->add_child ("Duration")->add_child_text (lexical_cast<string> (_duration));
124 if (!_key_id.empty ()) {
125 a->add_child("KeyId")->add_child_text ("urn:uuid:" + _key_id);
130 MXF::set_key (Key key)
134 if (_key_id.empty ()) {
135 /* No key ID so far; we now need one */
136 _key_id = make_uuid ();
139 _decryption_context = new ASDCP::AESDecContext;
140 if (ASDCP_FAILURE (_decryption_context->InitKey (_key->value ()))) {
141 throw MiscError ("could not set up decryption context");
144 _encryption_context = new ASDCP::AESEncContext;
145 if (ASDCP_FAILURE (_encryption_context->InitKey (_key->value ()))) {
146 throw MiscError ("could not set up encryption context");
149 uint8_t cbc_buffer[ASDCP::CBC_BLOCK_SIZE];
151 Kumu::FortunaRNG rng;
152 if (ASDCP_FAILURE (_encryption_context->SetIVec (rng.FillRandom (cbc_buffer, ASDCP::CBC_BLOCK_SIZE)))) {
153 throw MiscError ("could not set up CBC initialization vector");