2 Copyright (c) 2004-2006, John Hurst
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
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9 notice, this list of conditions and the following disclaimer.
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27 /*! \file AS_DCP_internal.h
29 \brief AS-DCP library, non-public common elements
32 #ifndef _AS_DCP_INTERNAL_H__
33 #define _AS_DCP_INTERNAL_H__
35 #include "AS_DCP_system.h"
37 #include "hex_utils.h"
40 using namespace ASDCP;
41 using namespace ASDCP::MXF;
47 // constant values used to calculate KLV and EKLV packet sizes
49 static const ui32_t klv_cryptinfo_size =
51 + UUIDlen /* ContextID */
53 + sizeof(ui64_t) /* PlaintextOffset */
55 + SMPTE_UL_LENGTH /* SourceKey */
57 + sizeof(ui64_t) /* SourceLength */
58 + MXF_BER_LENGTH /* ESV length */ ;
60 static const ui32_t klv_intpack_size =
62 + UUIDlen /* TrackFileID */
64 + sizeof(ui64_t) /* SequenceNumber */
66 + 20; /* HMAC length*/
68 // calculate size of encrypted essence with IV, CheckValue, and padding
70 calc_esv_length(ui32_t source_length, ui32_t plaintext_offset)
72 ui32_t ct_size = source_length - plaintext_offset;
73 ui32_t diff = ct_size % CBC_BLOCK_SIZE;
74 ui32_t block_size = ct_size - diff;
75 return plaintext_offset + block_size + (CBC_BLOCK_SIZE * 3);
78 // the check value for EKLV packets
80 static const byte_t ESV_CheckValue[CBC_BLOCK_SIZE] =
81 { 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b,
82 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b };
84 //------------------------------------------------------------------------------------------
87 Result_t MD_to_WriterInfo(MXF::Identification*, WriterInfo&);
88 Result_t MD_to_CryptoInfo(MXF::CryptographicContext*, WriterInfo&);
89 Result_t EncryptFrameBuffer(const ASDCP::FrameBuffer&, ASDCP::FrameBuffer&, AESEncContext*);
90 Result_t DecryptFrameBuffer(const ASDCP::FrameBuffer&, ASDCP::FrameBuffer&, AESDecContext*);
95 ASDCP_NO_COPY_CONSTRUCT(h__Reader);
99 OPAtomHeader m_HeaderPart;
100 Partition m_BodyPart;
101 OPAtomIndexFooter m_FooterPart;
102 ui64_t m_EssenceStart;
104 ASDCP::FrameBuffer m_CtFrameBuf;
105 fpos_t m_LastPosition;
108 virtual ~h__Reader();
111 Result_t OpenMXFRead(const char* filename);
112 Result_t InitMXFIndex();
113 Result_t ReadEKLVPacket(ui32_t FrameNum, ASDCP::FrameBuffer& FrameBuf,
114 const byte_t* EssenceUL, AESDecContext* Ctx, HMACContext* HMAC);
119 // state machine for mxf writer
121 ST_BEGIN, // waiting for Open()
122 ST_INIT, // waiting for SetSourceStream()
123 ST_READY, // ready to write frames
124 ST_RUNNING, // one or more frames written
125 ST_FINAL, // index written, file closed
128 // implementation of h__WriterState class Goto_* methods
129 #define Goto_body(s1,s2) if ( m_State != (s1) ) \
130 return RESULT_STATE; \
136 ASDCP_NO_COPY_CONSTRUCT(h__WriterState);
139 WriterState_t m_State;
140 h__WriterState() : m_State(ST_BEGIN) {}
143 inline bool Test_BEGIN() { return m_State == ST_BEGIN; }
144 inline bool Test_INIT() { return m_State == ST_INIT; }
145 inline bool Test_READY() { return m_State == ST_READY;}
146 inline bool Test_RUNNING() { return m_State == ST_RUNNING; }
147 inline bool Test_FINAL() { return m_State == ST_FINAL; }
148 inline Result_t Goto_INIT() { Goto_body(ST_BEGIN, ST_INIT); }
149 inline Result_t Goto_READY() { Goto_body(ST_INIT, ST_READY); }
150 inline Result_t Goto_RUNNING() { Goto_body(ST_READY, ST_RUNNING); }
151 inline Result_t Goto_FINAL() { Goto_body(ST_RUNNING, ST_FINAL); }
157 ASDCP_NO_COPY_CONSTRUCT(h__Writer);
162 OPAtomHeader m_HeaderPart;
163 Partition m_BodyPart;
164 OPAtomIndexFooter m_FooterPart;
165 ui64_t m_EssenceStart;
167 MaterialPackage* m_MaterialPackage;
168 Sequence* m_MPTCSequence;
169 TimecodeComponent* m_MPTimecode;
170 Sequence* m_MPClSequence;
171 SourceClip* m_MPClip; //! Material Package SourceClip for each essence stream
173 SourcePackage* m_FilePackage;
174 Sequence* m_FPTCSequence;
175 TimecodeComponent* m_FPTimecode;
176 Sequence* m_FPClSequence;
177 SourceClip* m_FPClip; //! File Package SourceClip for each essence stream
179 FileDescriptor* m_EssenceDescriptor;
181 ui32_t m_FramesWritten;
182 ui64_t m_StreamOffset;
183 ASDCP::FrameBuffer m_CtFrameBuf;
184 h__WriterState m_State;
188 virtual ~h__Writer();
190 Result_t WriteMXFHeader(const std::string& PackageLabel, const UL& WrappingUL,
191 const std::string& TrackName, const UL& DataDefinition,
192 const MXF::Rational& EditRate,
193 ui32_t TCFrameRate, ui32_t BytesPerEditUnit = 0);
195 Result_t WriteEKLVPacket(const ASDCP::FrameBuffer& FrameBuf,
196 const byte_t* EssenceUL, AESEncContext* Ctx, HMACContext* HMAC);
198 Result_t WriteMXFFooter();
203 // helper class for calculating Integrity Packs, used by WriteEKLVPacket() below.
208 byte_t Data[klv_intpack_size];
211 memset(Data, 0, klv_intpack_size);
216 Result_t CalcValues(const ASDCP::FrameBuffer&, byte_t* AssetID, ui32_t sequence, HMACContext* HMAC);
217 Result_t TestValues(const ASDCP::FrameBuffer&, byte_t* AssetID, ui32_t sequence, HMACContext* HMAC);
223 #endif // _AS_DCP_INTERNAL_H__
227 // end AS_DCP_internal.h