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>
30 #include "mxf_asset.h"
33 #include "exceptions.h"
37 using boost::shared_ptr;
38 using boost::dynamic_pointer_cast;
39 using namespace libdcp;
41 MXFAsset::MXFAsset (string directory, string file_name, boost::signals2::signal<void (float)>* progress, int fps, int entry_point, int length, bool encrypted)
42 : Asset (directory, file_name)
43 , _progress (progress)
45 , _entry_point (entry_point)
47 , _encrypted (encrypted)
48 , _encryption_context (0)
51 _key_id = make_uuid ();
52 uint8_t key_buffer[ASDCP::KeyLen];
54 rng.FillRandom (key_buffer, ASDCP::KeyLen);
55 char key_string[ASDCP::KeyLen * 4];
56 Kumu::bin2hex (key_buffer, ASDCP::KeyLen, key_string, ASDCP::KeyLen * 4);
57 _key_value = key_string;
59 _encryption_context = new ASDCP::AESEncContext;
60 if (ASDCP_FAILURE (_encryption_context->InitKey (key_buffer))) {
61 throw MiscError ("could not set up encryption context");
64 uint8_t cbc_buffer[ASDCP::CBC_BLOCK_SIZE];
66 if (ASDCP_FAILURE (_encryption_context->SetIVec (rng.FillRandom (cbc_buffer, ASDCP::CBC_BLOCK_SIZE)))) {
67 throw MiscError ("could not set up CBC initialization vector");
72 MXFAsset::~MXFAsset ()
74 delete _encryption_context;
78 MXFAsset::fill_writer_info (ASDCP::WriterInfo* writer_info) const
80 writer_info->ProductVersion = Metadata::instance()->product_version;
81 writer_info->CompanyName = Metadata::instance()->company_name;
82 writer_info->ProductName = Metadata::instance()->product_name.c_str();
84 writer_info->LabelSetType = ASDCP::LS_MXF_SMPTE;
86 Kumu::hex2bin (_uuid.c_str(), writer_info->AssetUUID, Kumu::UUID_Length, &c);
87 assert (c == Kumu::UUID_Length);
90 Kumu::GenRandomUUID (writer_info->ContextID);
91 writer_info->EncryptedEssence = true;
94 Kumu::hex2bin (_key_id.c_str(), writer_info->CryptographicKeyID, Kumu::UUID_Length, &c);
95 assert (c == Kumu::UUID_Length);
100 MXFAsset::equals (shared_ptr<const Asset> other, EqualityOptions, list<string>& notes) const
102 shared_ptr<const MXFAsset> other_mxf = dynamic_pointer_cast<const MXFAsset> (other);
104 notes.push_back ("comparing an MXF asset with a non-MXF asset");
108 if (_file_name != other_mxf->_file_name) {
109 notes.push_back ("MXF names differ");
113 if (_fps != other_mxf->_fps) {
114 notes.push_back ("MXF frames per second differ");
118 if (_length != other_mxf->_length) {
119 notes.push_back ("MXF lengths differ");
127 MXFAsset::length () const