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 <libxml++/nodes/element.h>
31 #include "mxf_asset.h"
34 #include "exceptions.h"
38 using boost::shared_ptr;
39 using boost::dynamic_pointer_cast;
40 using namespace libdcp;
42 MXFAsset::MXFAsset (string directory, string file_name, boost::signals2::signal<void (float)>* progress, int fps, int entry_point, int length, bool encrypted)
43 : Asset (directory, file_name)
44 , _progress (progress)
46 , _entry_point (entry_point)
48 , _encrypted (encrypted)
49 , _encryption_context (0)
52 _key_id = make_uuid ();
53 uint8_t key_buffer[ASDCP::KeyLen];
55 rng.FillRandom (key_buffer, ASDCP::KeyLen);
56 char key_string[ASDCP::KeyLen * 4];
57 Kumu::bin2hex (key_buffer, ASDCP::KeyLen, key_string, ASDCP::KeyLen * 4);
58 _key_value = key_string;
60 _encryption_context = new ASDCP::AESEncContext;
61 if (ASDCP_FAILURE (_encryption_context->InitKey (key_buffer))) {
62 throw MiscError ("could not set up encryption context");
65 uint8_t cbc_buffer[ASDCP::CBC_BLOCK_SIZE];
67 if (ASDCP_FAILURE (_encryption_context->SetIVec (rng.FillRandom (cbc_buffer, ASDCP::CBC_BLOCK_SIZE)))) {
68 throw MiscError ("could not set up CBC initialization vector");
73 MXFAsset::~MXFAsset ()
75 delete _encryption_context;
79 MXFAsset::fill_writer_info (ASDCP::WriterInfo* writer_info) const
81 writer_info->ProductVersion = Metadata::instance()->product_version;
82 writer_info->CompanyName = Metadata::instance()->company_name;
83 writer_info->ProductName = Metadata::instance()->product_name.c_str();
85 writer_info->LabelSetType = ASDCP::LS_MXF_SMPTE;
87 Kumu::hex2bin (_uuid.c_str(), writer_info->AssetUUID, Kumu::UUID_Length, &c);
88 assert (c == Kumu::UUID_Length);
91 Kumu::GenRandomUUID (writer_info->ContextID);
92 writer_info->EncryptedEssence = true;
95 Kumu::hex2bin (_key_id.c_str(), writer_info->CryptographicKeyID, Kumu::UUID_Length, &c);
96 assert (c == Kumu::UUID_Length);
101 MXFAsset::equals (shared_ptr<const Asset> other, EqualityOptions, list<string>& notes) const
103 shared_ptr<const MXFAsset> other_mxf = dynamic_pointer_cast<const MXFAsset> (other);
105 notes.push_back ("comparing an MXF asset with a non-MXF asset");
109 if (_file_name != other_mxf->_file_name) {
110 notes.push_back ("MXF names differ");
114 if (_fps != other_mxf->_fps) {
115 notes.push_back ("MXF frames per second differ");
119 if (_length != other_mxf->_length) {
120 notes.push_back ("MXF lengths differ");
128 MXFAsset::length () const
134 MXFAsset::add_typed_key_id (xmlpp::Element* parent) const
136 xmlpp::Element* typed_key_id = parent->add_child("TypedKeyId");
137 typed_key_id->add_child("KeyType")->add_child_text(key_type ());
138 typed_key_id->add_child("KeyId")->add_child_text("urn:uuid:" + _key_id);