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|
/*****************************************************************
|
| AP4 - OMA DCF support
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL 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, or (at your option)
| any later version.
|
| Bento4|GPL 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 Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
#ifndef _AP4_OMA_DCF_H_
#define _AP4_OMA_DCF_H_
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4Types.h"
#include "Ap4SampleEntry.h"
#include "Ap4Atom.h"
#include "Ap4AtomFactory.h"
#include "Ap4SampleDescription.h"
#include "Ap4Processor.h"
#include "Ap4Protection.h"
#include "Ap4DynamicCast.h"
/*----------------------------------------------------------------------
| class references
+---------------------------------------------------------------------*/
class AP4_OdafAtom;
class AP4_TrakAtom;
class AP4_StreamCipher;
class AP4_CbcStreamCipher;
class AP4_CtrStreamCipher;
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
const AP4_UI32 AP4_PROTECTION_SCHEME_TYPE_OMA = AP4_ATOM_TYPE('o','d','k','m');
const AP4_UI32 AP4_PROTECTION_SCHEME_VERSION_OMA_20 = 0x00000200;
const AP4_UI32 AP4_OMA_DCF_BRAND_ODCF = AP4_ATOM_TYPE('o','d','c','f');
const AP4_UI32 AP4_OMA_DCF_BRAND_OPF2 = AP4_ATOM_TYPE('o','p','f','2');
typedef enum {
AP4_OMA_DCF_CIPHER_MODE_CTR,
AP4_OMA_DCF_CIPHER_MODE_CBC
} AP4_OmaDcfCipherMode;
/*----------------------------------------------------------------------
| AP4_OmaDcfAtomDecrypter
+---------------------------------------------------------------------*/
class AP4_OmaDcfAtomDecrypter {
public:
// class methods
static AP4_Result DecryptAtoms(AP4_AtomParent& atoms,
AP4_Processor::ProgressListener* listener,
AP4_BlockCipherFactory* block_cipher_factory,
AP4_ProtectionKeyMap& key_map);
// Returns a byte stream that will produce the decrypted data found
// in the 'odda' child atom of an 'odrm' atom
static AP4_Result CreateDecryptingStream(AP4_ContainerAtom& odrm_atom,
const AP4_UI08* key,
AP4_Size key_size,
AP4_BlockCipherFactory* block_cipher_factory,
AP4_ByteStream*& stream);
// Returns a byte stream that will produce the decrypted data from
// an encrypted stream where the IV follows the encrypted bytes.
// This method is normally not called directly: most callers will call
// the stream factory that takes an 'odrm' atom as an input parameter
static AP4_Result CreateDecryptingStream(AP4_OmaDcfCipherMode mode,
AP4_ByteStream& encrypted_stream,
AP4_LargeSize cleartext_size,
const AP4_UI08* key,
AP4_Size key_size,
AP4_BlockCipherFactory* block_cipher_factory,
AP4_ByteStream*& stream);
};
/*----------------------------------------------------------------------
| AP4_OmaDcfSampleDecrypter
+---------------------------------------------------------------------*/
class AP4_OmaDcfSampleDecrypter : public AP4_SampleDecrypter
{
public:
// factory
static AP4_Result Create(AP4_ProtectedSampleDescription* sample_description,
const AP4_UI08* key,
AP4_Size key_size,
AP4_BlockCipherFactory* block_cipher_factory,
AP4_OmaDcfSampleDecrypter*& cipher);
// constructor and destructor
AP4_OmaDcfSampleDecrypter(AP4_Size iv_length,
bool selective_encryption) :
m_IvLength(iv_length),
m_KeyIndicatorLength(0),
m_SelectiveEncryption(selective_encryption) {}
protected:
AP4_Size m_IvLength;
AP4_Size m_KeyIndicatorLength;
bool m_SelectiveEncryption;
};
/*----------------------------------------------------------------------
| AP4_OmaDcfCtrSampleDecrypter
+---------------------------------------------------------------------*/
class AP4_OmaDcfCtrSampleDecrypter : public AP4_OmaDcfSampleDecrypter
{
public:
// constructor and destructor
AP4_OmaDcfCtrSampleDecrypter(AP4_BlockCipher* block_cipher,
AP4_Size iv_length,
bool selective_encryption);
~AP4_OmaDcfCtrSampleDecrypter();
// methods
virtual AP4_Result DecryptSampleData(AP4_UI32 pool_id, AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
const AP4_UI08* iv = NULL);
virtual AP4_Size GetDecryptedSampleSize(AP4_Sample& sample);
private:
// members
AP4_CtrStreamCipher* m_Cipher;
};
/*----------------------------------------------------------------------
| AP4_OmaDcfCbcSampleDecrypter
+---------------------------------------------------------------------*/
class AP4_OmaDcfCbcSampleDecrypter : public AP4_OmaDcfSampleDecrypter
{
public:
// constructor and destructor
AP4_OmaDcfCbcSampleDecrypter(AP4_BlockCipher* block_cipher,
bool selective_encryption);
~AP4_OmaDcfCbcSampleDecrypter();
// methods
virtual AP4_Result DecryptSampleData(AP4_UI32 pool_id, AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
const AP4_UI08* iv = NULL);
virtual AP4_Size GetDecryptedSampleSize(AP4_Sample& sample);
private:
// members
AP4_CbcStreamCipher* m_Cipher;
};
/*----------------------------------------------------------------------
| AP4_OmaDcfTrackDecrypter
+---------------------------------------------------------------------*/
class AP4_OmaDcfTrackDecrypter : public AP4_Processor::TrackHandler {
public:
// constructor
static AP4_Result Create(AP4_TrakAtom* trak,
AP4_TrexAtom* trex,
const AP4_UI08* key,
AP4_Size key_size,
AP4_ProtectedSampleDescription* sample_description,
AP4_SampleEntry* sample_entry,
AP4_BlockCipherFactory* block_cipher_factory,
AP4_OmaDcfTrackDecrypter*& decrypter);
virtual ~AP4_OmaDcfTrackDecrypter();
// methods
virtual AP4_Size GetProcessedSampleSize(AP4_Sample& sample);
virtual AP4_Result ProcessTrack();
virtual AP4_Result ProcessSample(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out);
private:
// constructor
AP4_OmaDcfTrackDecrypter(AP4_TrakAtom* trak,
AP4_TrexAtom* trex,
AP4_OmaDcfSampleDecrypter* cipher,
AP4_SampleEntry* sample_entry,
AP4_UI32 original_format);
// members
AP4_OmaDcfSampleDecrypter* m_Cipher;
AP4_SampleEntry* m_SampleEntry;
AP4_UI32 m_OriginalFormat;
};
/*----------------------------------------------------------------------
| AP4_OmaDcfSampleEncrypter
+---------------------------------------------------------------------*/
class AP4_OmaDcfSampleEncrypter
{
public:
// constructor and destructor
AP4_OmaDcfSampleEncrypter(const AP4_UI08* salt); // salt is only 8 bytes
virtual ~AP4_OmaDcfSampleEncrypter() {}
// methods
virtual AP4_Result EncryptSampleData(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
AP4_UI64 bso,
bool skip_encryption) = 0;
virtual AP4_Size GetEncryptedSampleSize(AP4_Sample& sample) = 0;
protected:
// members
AP4_UI08 m_Salt[16];
};
/*----------------------------------------------------------------------
| AP4_OmaDcfCtrSampleEncrypter
+---------------------------------------------------------------------*/
class AP4_OmaDcfCtrSampleEncrypter : public AP4_OmaDcfSampleEncrypter
{
public:
// constructor and destructor
AP4_OmaDcfCtrSampleEncrypter(AP4_BlockCipher* block_cipher,
const AP4_UI08* salt); // salt is only 8 bytes
~AP4_OmaDcfCtrSampleEncrypter();
// methods
virtual AP4_Result EncryptSampleData(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
AP4_UI64 bso,
bool skip_encryption);
virtual AP4_Size GetEncryptedSampleSize(AP4_Sample& sample);
private:
// members
AP4_CtrStreamCipher* m_Cipher;
};
/*----------------------------------------------------------------------
| AP4_OmaDcfCbcSampleEncrypter
+---------------------------------------------------------------------*/
class AP4_OmaDcfCbcSampleEncrypter : public AP4_OmaDcfSampleEncrypter
{
public:
// constructor and destructor
AP4_OmaDcfCbcSampleEncrypter(AP4_BlockCipher* block_cipher,
const AP4_UI08* salt); // salt is only 8 bytes
~AP4_OmaDcfCbcSampleEncrypter();
// methods
virtual AP4_Result EncryptSampleData(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
AP4_UI64 bso,
bool skip_encryption);
virtual AP4_Size GetEncryptedSampleSize(AP4_Sample& sample);
private:
// members
AP4_CbcStreamCipher* m_Cipher;
};
/*----------------------------------------------------------------------
| AP4_OmaDcfDecryptingProcessor
+---------------------------------------------------------------------*/
/**
* Use for DCF only, not PDCF. For PDCF, use the
* AP4_StandardDecryptingProcessor class
*/
class AP4_OmaDcfDecryptingProcessor : public AP4_Processor
{
public:
// constructor
AP4_OmaDcfDecryptingProcessor(const AP4_ProtectionKeyMap* key_map = NULL,
AP4_BlockCipherFactory* block_cipher_factory = NULL);
// accessors
AP4_ProtectionKeyMap& GetKeyMap() { return m_KeyMap; }
// methods
virtual AP4_Result Initialize(AP4_AtomParent& top_level,
AP4_ByteStream& stream,
ProgressListener* listener);
private:
// members
AP4_BlockCipherFactory* m_BlockCipherFactory;
AP4_ProtectionKeyMap m_KeyMap;
};
/*----------------------------------------------------------------------
| AP4_OmaDcfEncryptingProcessor
+---------------------------------------------------------------------*/
class AP4_OmaDcfEncryptingProcessor : public AP4_Processor
{
public:
// constructor
AP4_OmaDcfEncryptingProcessor(AP4_OmaDcfCipherMode cipher_mode,
AP4_BlockCipherFactory* block_cipher_factory = NULL);
// accessors
AP4_ProtectionKeyMap& GetKeyMap() { return m_KeyMap; }
AP4_TrackPropertyMap& GetPropertyMap() { return m_PropertyMap; }
// AP4_Processor methods
virtual AP4_Result Initialize(AP4_AtomParent& top_level,
AP4_ByteStream& stream,
AP4_Processor::ProgressListener* listener = NULL);
virtual AP4_Processor::TrackHandler* CreateTrackHandler(AP4_TrakAtom* trak);
private:
// members
AP4_OmaDcfCipherMode m_CipherMode;
AP4_BlockCipherFactory* m_BlockCipherFactory;
AP4_ProtectionKeyMap m_KeyMap;
AP4_TrackPropertyMap m_PropertyMap;
};
/*----------------------------------------------------------------------
| AP4_OmaDrmInfo
+---------------------------------------------------------------------*/
class AP4_OmaDrmInfo
{
public:
AP4_IMPLEMENT_DYNAMIC_CAST(AP4_OmaDrmInfo)
virtual ~AP4_OmaDrmInfo() {}
virtual const AP4_String& GetContentId() const = 0;
virtual const AP4_String& GetRightsIssuerUrl() const = 0;
virtual const AP4_DataBuffer& GetTextualHeaders() const = 0;
};
#endif // _AP4_OMA_DCF_H_
|
