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 (string directory, string file_name)
47 : Asset (directory, file_name)
50 , _encryption_context (0)
51 , _decryption_context (0)
56 MXFAsset::MXFAsset (string directory, string file_name, boost::signals2::signal<void (float)>* progress, int edit_rate, int intrinsic_duration, bool encrypted)
57 : Asset (directory, file_name, edit_rate, intrinsic_duration)
58 , _progress (progress)
59 , _encrypted (encrypted)
60 , _encryption_context (0)
61 , _decryption_context (0)
64 /* Generate an encryption key and a UUID for it */
65 _key_id = make_uuid ();
66 uint8_t key_buffer[ASDCP::KeyLen];
68 rng.FillRandom (key_buffer, ASDCP::KeyLen);
69 char key_string[ASDCP::KeyLen * 4];
70 Kumu::bin2hex (key_buffer, ASDCP::KeyLen, key_string, ASDCP::KeyLen * 4);
71 _key_value = key_string;
73 _encryption_context = new ASDCP::AESEncContext;
74 if (ASDCP_FAILURE (_encryption_context->InitKey (key_buffer))) {
75 throw MiscError ("could not set up encryption context");
78 uint8_t cbc_buffer[ASDCP::CBC_BLOCK_SIZE];
80 if (ASDCP_FAILURE (_encryption_context->SetIVec (rng.FillRandom (cbc_buffer, ASDCP::CBC_BLOCK_SIZE)))) {
81 throw MiscError ("could not set up CBC initialization vector");
86 MXFAsset::~MXFAsset ()
88 delete _encryption_context;
92 MXFAsset::fill_writer_info (ASDCP::WriterInfo* writer_info, string uuid, bool interop, MXFMetadata const & metadata)
94 writer_info->ProductVersion = metadata.product_version;
95 writer_info->CompanyName = metadata.company_name;
96 writer_info->ProductName = metadata.product_name.c_str();
99 writer_info->LabelSetType = ASDCP::LS_MXF_INTEROP;
101 writer_info->LabelSetType = ASDCP::LS_MXF_SMPTE;
104 Kumu::hex2bin (uuid.c_str(), writer_info->AssetUUID, Kumu::UUID_Length, &c);
105 assert (c == Kumu::UUID_Length);
108 Kumu::GenRandomUUID (writer_info->ContextID);
109 writer_info->EncryptedEssence = true;
112 Kumu::hex2bin (_key_id.c_str(), writer_info->CryptographicKeyID, Kumu::UUID_Length, &c);
113 assert (c == Kumu::UUID_Length);
118 MXFAsset::equals (shared_ptr<const Asset> other, EqualityOptions opt, boost::function<void (NoteType, string)> note) const
120 if (!Asset::equals (other, opt, note)) {
124 shared_ptr<const MXFAsset> other_mxf = dynamic_pointer_cast<const MXFAsset> (other);
126 note (ERROR, "comparing an MXF asset with a non-MXF asset");
130 if (_file_name != other_mxf->_file_name) {
131 note (ERROR, "MXF names differ");
132 if (!opt.mxf_names_can_differ) {
141 MXFAsset::add_typed_key_id (xmlpp::Element* parent) const
143 xmlpp::Element* typed_key_id = parent->add_child("TypedKeyId");
144 typed_key_id->add_child("KeyType")->add_child_text(key_type ());
145 typed_key_id->add_child("KeyId")->add_child_text("urn:uuid:" + _key_id);
149 MXFAsset::write_to_cpl (xmlpp::Element* node, bool interop) const
151 pair<string, string> const attr = cpl_node_attribute (interop);
152 xmlpp::Element* a = node->add_child (cpl_node_name ());
153 if (!attr.first.empty ()) {
154 a->set_attribute (attr.first, attr.second);
156 a->add_child ("Id")->add_child_text ("urn:uuid:" + _uuid);
157 a->add_child ("AnnotationText")->add_child_text (_file_name);
158 a->add_child ("EditRate")->add_child_text (lexical_cast<string> (_edit_rate) + " 1");
159 a->add_child ("IntrinsicDuration")->add_child_text (lexical_cast<string> (_intrinsic_duration));
160 a->add_child ("EntryPoint")->add_child_text (lexical_cast<string> (_entry_point));
161 a->add_child ("Duration")->add_child_text (lexical_cast<string> (_duration));
163 a->add_child("KeyId")->add_child_text ("urn:uuid:" + _key_id);
168 MXFAsset::set_kdm_cipher (KDMCipher cipher)
170 _decryption_context = new ASDCP::AESDecContext;
171 if (ASDCP_FAILURE (_decryption_context->InitKey (cipher.key_raw ()))) {
172 throw MiscError ("could not set up decryption context");