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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file src/asset.cc
* @brief Parent class for assets of DCPs made up of MXF files.
*/
#include <iostream>
#include <fstream>
#include <boost/filesystem.hpp>
#include <boost/lexical_cast.hpp>
#include <libxml++/nodes/element.h>
#include "AS_DCP.h"
#include "KM_prng.h"
#include "KM_util.h"
#include "mxf_asset.h"
#include "util.h"
#include "metadata.h"
#include "exceptions.h"
#include "kdm.h"
using std::string;
using std::list;
using boost::shared_ptr;
using boost::lexical_cast;
using boost::dynamic_pointer_cast;
using namespace libdcp;
MXFAsset::MXFAsset (string directory, string file_name)
: Asset (directory, file_name)
, _progress (0)
, _encrypted (false)
, _encryption_context (0)
, _decryption_context (0)
{
}
MXFAsset::MXFAsset (string directory, string file_name, boost::signals2::signal<void (float)>* progress, int edit_rate, int intrinsic_duration, bool encrypted)
: Asset (directory, file_name, edit_rate, intrinsic_duration)
, _progress (progress)
, _encrypted (encrypted)
, _encryption_context (0)
, _decryption_context (0)
{
if (_encrypted) {
_key_id = make_uuid ();
uint8_t key_buffer[ASDCP::KeyLen];
Kumu::FortunaRNG rng;
rng.FillRandom (key_buffer, ASDCP::KeyLen);
char key_string[ASDCP::KeyLen * 4];
Kumu::bin2hex (key_buffer, ASDCP::KeyLen, key_string, ASDCP::KeyLen * 4);
_key_value = key_string;
_encryption_context = new ASDCP::AESEncContext;
if (ASDCP_FAILURE (_encryption_context->InitKey (key_buffer))) {
throw MiscError ("could not set up encryption context");
}
uint8_t cbc_buffer[ASDCP::CBC_BLOCK_SIZE];
if (ASDCP_FAILURE (_encryption_context->SetIVec (rng.FillRandom (cbc_buffer, ASDCP::CBC_BLOCK_SIZE)))) {
throw MiscError ("could not set up CBC initialization vector");
}
}
}
MXFAsset::~MXFAsset ()
{
delete _encryption_context;
}
void
MXFAsset::fill_writer_info (ASDCP::WriterInfo* writer_info, string uuid, MXFMetadata const & metadata)
{
writer_info->ProductVersion = metadata.product_version;
writer_info->CompanyName = metadata.company_name;
writer_info->ProductName = metadata.product_name.c_str();
writer_info->LabelSetType = ASDCP::LS_MXF_SMPTE;
unsigned int c;
Kumu::hex2bin (uuid.c_str(), writer_info->AssetUUID, Kumu::UUID_Length, &c);
assert (c == Kumu::UUID_Length);
if (_encrypted) {
Kumu::GenRandomUUID (writer_info->ContextID);
writer_info->EncryptedEssence = true;
unsigned int c;
Kumu::hex2bin (_key_id.c_str(), writer_info->CryptographicKeyID, Kumu::UUID_Length, &c);
assert (c == Kumu::UUID_Length);
}
}
bool
MXFAsset::equals (shared_ptr<const Asset> other, EqualityOptions opt, boost::function<void (NoteType, string)> note) const
{
if (!Asset::equals (other, opt, note)) {
return false;
}
shared_ptr<const MXFAsset> other_mxf = dynamic_pointer_cast<const MXFAsset> (other);
if (!other_mxf) {
note (ERROR, "comparing an MXF asset with a non-MXF asset");
return false;
}
if (_file_name != other_mxf->_file_name) {
note (ERROR, "MXF names differ");
if (!opt.mxf_names_can_differ) {
return false;
}
}
return true;
}
void
MXFAsset::add_typed_key_id (xmlpp::Element* parent) const
{
xmlpp::Element* typed_key_id = parent->add_child("TypedKeyId");
typed_key_id->add_child("KeyType")->add_child_text(key_type ());
typed_key_id->add_child("KeyId")->add_child_text("urn:uuid:" + _key_id);
}
void
MXFAsset::write_to_cpl (xmlpp::Node* node) const
{
xmlpp::Node* a = node->add_child (cpl_node_name ());
a->add_child ("Id")->add_child_text ("urn:uuid:" + _uuid);
a->add_child ("AnnotationText")->add_child_text (_file_name);
a->add_child ("EditRate")->add_child_text (lexical_cast<string> (_edit_rate) + " 1");
a->add_child ("IntrinsicDuration")->add_child_text (lexical_cast<string> (_intrinsic_duration));
a->add_child ("EntryPoint")->add_child_text (lexical_cast<string> (_entry_point));
a->add_child ("Duration")->add_child_text (lexical_cast<string> (_duration));
if (_encrypted) {
a->add_child("KeyId")->add_child_text ("urn:uuid:" + _key_id);
}
}
void
MXFAsset::set_kdm_cipher (KDMCipher cipher)
{
_decryption_context = new ASDCP::AESDecContext;
if (ASDCP_FAILURE (_decryption_context->InitKey (cipher.key_raw ()))) {
throw MiscError ("could not set up decryption context");
}
}
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