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.
26 #include <boost/filesystem.hpp>
27 #include <boost/lexical_cast.hpp>
28 #include <libxml++/nodes/element.h>
32 #include "mxf_asset.h"
35 #include "exceptions.h"
41 using boost::shared_ptr;
42 using boost::lexical_cast;
43 using boost::dynamic_pointer_cast;
44 using namespace libdcp;
46 MXFAsset::MXFAsset (boost::filesystem::path directory, string file_name)
47 : Asset (directory, file_name)
49 , _encryption_context (0)
50 , _decryption_context (0)
55 MXFAsset::MXFAsset (boost::filesystem::path directory, string file_name, boost::signals2::signal<void (float)>* progress, int edit_rate, int intrinsic_duration)
56 : Asset (directory, file_name, edit_rate, intrinsic_duration)
57 , _progress (progress)
58 , _encryption_context (0)
59 , _decryption_context (0)
64 MXFAsset::~MXFAsset ()
66 delete _encryption_context;
67 delete _decryption_context;
71 MXFAsset::fill_writer_info (ASDCP::WriterInfo* writer_info, string uuid, bool interop, MXFMetadata const & metadata)
73 writer_info->ProductVersion = metadata.product_version;
74 writer_info->CompanyName = metadata.company_name;
75 writer_info->ProductName = metadata.product_name.c_str();
78 writer_info->LabelSetType = ASDCP::LS_MXF_INTEROP;
80 writer_info->LabelSetType = ASDCP::LS_MXF_SMPTE;
83 Kumu::hex2bin (uuid.c_str(), writer_info->AssetUUID, Kumu::UUID_Length, &c);
84 assert (c == Kumu::UUID_Length);
87 Kumu::GenRandomUUID (writer_info->ContextID);
88 writer_info->EncryptedEssence = true;
91 Kumu::hex2bin (_key_id.c_str(), writer_info->CryptographicKeyID, Kumu::UUID_Length, &c);
92 assert (c == Kumu::UUID_Length);
97 MXFAsset::equals (shared_ptr<const Asset> other, EqualityOptions opt, boost::function<void (NoteType, string)> note) const
99 if (!Asset::equals (other, opt, note)) {
103 shared_ptr<const MXFAsset> other_mxf = dynamic_pointer_cast<const MXFAsset> (other);
105 note (ERROR, "comparing an MXF asset with a non-MXF asset");
109 if (_file_name != other_mxf->_file_name) {
110 note (ERROR, "MXF names differ");
111 if (!opt.mxf_names_can_differ) {
120 MXFAsset::write_to_cpl (xmlpp::Element* node, bool interop) const
122 pair<string, string> const attr = cpl_node_attribute (interop);
123 xmlpp::Element* a = node->add_child (cpl_node_name ());
124 if (!attr.first.empty ()) {
125 a->set_attribute (attr.first, attr.second);
127 a->add_child ("Id")->add_child_text ("urn:uuid:" + _uuid);
128 a->add_child ("AnnotationText")->add_child_text (_file_name);
129 a->add_child ("EditRate")->add_child_text (lexical_cast<string> (_edit_rate) + " 1");
130 a->add_child ("IntrinsicDuration")->add_child_text (lexical_cast<string> (_intrinsic_duration));
131 a->add_child ("EntryPoint")->add_child_text (lexical_cast<string> (_entry_point));
132 a->add_child ("Duration")->add_child_text (lexical_cast<string> (_duration));
133 if (!_key_id.empty ()) {
134 a->add_child("KeyId")->add_child_text ("urn:uuid:" + _key_id);
139 MXFAsset::set_key (Key key)
143 if (_key_id.empty ()) {
144 /* No key ID so far; we now need one */
145 _key_id = make_uuid ();
148 _decryption_context = new ASDCP::AESDecContext;
149 if (ASDCP_FAILURE (_decryption_context->InitKey (_key->value ()))) {
150 throw MiscError ("could not set up decryption context");
153 _encryption_context = new ASDCP::AESEncContext;
154 if (ASDCP_FAILURE (_encryption_context->InitKey (_key->value ()))) {
155 throw MiscError ("could not set up encryption context");
158 uint8_t cbc_buffer[ASDCP::CBC_BLOCK_SIZE];
160 Kumu::FortunaRNG rng;
161 if (ASDCP_FAILURE (_encryption_context->SetIVec (rng.FillRandom (cbc_buffer, ASDCP::CBC_BLOCK_SIZE)))) {
162 throw MiscError ("could not set up CBC initialization vector");