2 Copyright (c) 2004-2009, 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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11 notice, this list of conditions and the following disclaimer in the
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13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
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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 <KM_platform.h>
40 using Kumu::DefaultLogSink;
41 // using namespace std;
42 using namespace ASDCP;
43 using namespace ASDCP::MXF;
49 // constant values used to calculate KLV and EKLV packet sizes
50 static const ui32_t klv_cryptinfo_size =
52 + UUIDlen /* ContextID */
54 + sizeof(ui64_t) /* PlaintextOffset */
56 + SMPTE_UL_LENGTH /* SourceKey */
58 + sizeof(ui64_t) /* SourceLength */
59 + MXF_BER_LENGTH /* ESV length */ ;
61 static const ui32_t klv_intpack_size =
63 + UUIDlen /* TrackFileID */
65 + sizeof(ui64_t) /* SequenceNumber */
67 + 20; /* HMAC length*/
69 // calculate size of encrypted essence with IV, CheckValue, and padding
71 calc_esv_length(ui32_t source_length, ui32_t plaintext_offset)
73 ui32_t ct_size = source_length - plaintext_offset;
74 ui32_t diff = ct_size % CBC_BLOCK_SIZE;
75 ui32_t block_size = ct_size - diff;
76 return plaintext_offset + block_size + (CBC_BLOCK_SIZE * 3);
79 // the check value for EKLV packets
81 static const byte_t ESV_CheckValue[CBC_BLOCK_SIZE] =
82 { 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b,
83 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b };
85 //------------------------------------------------------------------------------------------
88 Result_t MD_to_WriterInfo(MXF::Identification*, WriterInfo&);
89 Result_t MD_to_CryptoInfo(MXF::CryptographicContext*, WriterInfo&, const Dictionary&);
90 Result_t EncryptFrameBuffer(const ASDCP::FrameBuffer&, ASDCP::FrameBuffer&, AESEncContext*);
91 Result_t DecryptFrameBuffer(const ASDCP::FrameBuffer&, ASDCP::FrameBuffer&, AESDecContext*);
94 class KLReader : public ASDCP::KLVPacket
96 ASDCP_NO_COPY_CONSTRUCT(KLReader);
97 byte_t m_KeyBuf[SMPTE_UL_LENGTH*2];
103 inline const byte_t* Key() { return m_KeyBuf; }
104 inline const ui64_t Length() { return m_ValueLength; }
105 inline const ui64_t KLLength() { return m_KLLength; }
107 Result_t ReadKLFromFile(Kumu::FileReader& Reader);
113 ASDCP_NO_COPY_CONSTRUCT(h__Reader);
117 const Dictionary& m_Dict;
118 Kumu::FileReader m_File;
119 OPAtomHeader m_HeaderPart;
120 Partition m_BodyPart;
121 OPAtomIndexFooter m_FooterPart;
122 ui64_t m_EssenceStart;
124 ASDCP::FrameBuffer m_CtFrameBuf;
125 Kumu::fpos_t m_LastPosition;
127 h__Reader(const Dictionary&);
128 virtual ~h__Reader();
131 Result_t OpenMXFRead(const char* filename);
132 Result_t InitMXFIndex();
134 // positions file before reading
135 Result_t ReadEKLVFrame(ui32_t FrameNum, ASDCP::FrameBuffer& FrameBuf,
136 const byte_t* EssenceUL, AESDecContext* Ctx, HMACContext* HMAC);
138 // reads from current position
139 Result_t ReadEKLVPacket(ui32_t FrameNum, ui32_t SequenceNum, ASDCP::FrameBuffer& FrameBuf,
140 const byte_t* EssenceUL, AESDecContext* Ctx, HMACContext* HMAC);
145 // state machine for mxf writer
147 ST_BEGIN, // waiting for Open()
148 ST_INIT, // waiting for SetSourceStream()
149 ST_READY, // ready to write frames
150 ST_RUNNING, // one or more frames written
151 ST_FINAL, // index written, file closed
154 // implementation of h__WriterState class Goto_* methods
155 #define Goto_body(s1,s2) if ( m_State != (s1) ) \
156 return RESULT_STATE; \
162 ASDCP_NO_COPY_CONSTRUCT(h__WriterState);
165 WriterState_t m_State;
166 h__WriterState() : m_State(ST_BEGIN) {}
169 inline bool Test_BEGIN() { return m_State == ST_BEGIN; }
170 inline bool Test_INIT() { return m_State == ST_INIT; }
171 inline bool Test_READY() { return m_State == ST_READY;}
172 inline bool Test_RUNNING() { return m_State == ST_RUNNING; }
173 inline bool Test_FINAL() { return m_State == ST_FINAL; }
174 inline Result_t Goto_INIT() { Goto_body(ST_BEGIN, ST_INIT); }
175 inline Result_t Goto_READY() { Goto_body(ST_INIT, ST_READY); }
176 inline Result_t Goto_RUNNING() { Goto_body(ST_READY, ST_RUNNING); }
177 inline Result_t Goto_FINAL() { Goto_body(ST_RUNNING, ST_FINAL); }
180 typedef std::list<ui64_t*> DurationElementList_t;
185 ASDCP_NO_COPY_CONSTRUCT(h__Writer);
189 const Dictionary& m_Dict;
190 Kumu::FileWriter m_File;
192 OPAtomHeader m_HeaderPart;
193 Partition m_BodyPart;
194 OPAtomIndexFooter m_FooterPart;
195 ui64_t m_EssenceStart;
197 MaterialPackage* m_MaterialPackage;
198 SourcePackage* m_FilePackage;
200 FileDescriptor* m_EssenceDescriptor;
201 std::list<InterchangeObject*> m_EssenceSubDescriptorList;
203 ui32_t m_FramesWritten;
204 ui64_t m_StreamOffset;
205 ASDCP::FrameBuffer m_CtFrameBuf;
206 h__WriterState m_State;
208 DurationElementList_t m_DurationUpdateList;
210 h__Writer(const Dictionary&);
211 virtual ~h__Writer();
214 void AddSourceClip(const MXF::Rational& EditRate, ui32_t TCFrameRate,
215 const std::string& TrackName, const UL& DataDefinition,
216 const std::string& PackageLabel);
217 void AddDMSegment(const MXF::Rational& EditRate, ui32_t TCFrameRate,
218 const std::string& TrackName, const UL& DataDefinition,
219 const std::string& PackageLabel);
220 void AddEssenceDescriptor(const UL& WrappingUL);
221 Result_t CreateBodyPart(const MXF::Rational& EditRate, ui32_t BytesPerEditUnit = 0);
223 // all the above for a single source clip
224 Result_t WriteMXFHeader(const std::string& PackageLabel, const UL& WrappingUL,
225 const std::string& TrackName, const UL& DataDefinition,
226 const MXF::Rational& EditRate,
227 ui32_t TCFrameRate, ui32_t BytesPerEditUnit = 0);
229 Result_t WriteEKLVPacket(const ASDCP::FrameBuffer& FrameBuf,
230 const byte_t* EssenceUL, AESEncContext* Ctx, HMACContext* HMAC);
232 Result_t WriteMXFFooter();
237 // helper class for calculating Integrity Packs, used by WriteEKLVPacket() below.
242 byte_t Data[klv_intpack_size];
245 memset(Data, 0, klv_intpack_size);
250 Result_t CalcValues(const ASDCP::FrameBuffer&, byte_t* AssetID, ui32_t sequence, HMACContext* HMAC);
251 Result_t TestValues(const ASDCP::FrameBuffer&, byte_t* AssetID, ui32_t sequence, HMACContext* HMAC);
257 #endif // _AS_DCP_INTERNAL_H_
261 // end AS_DCP_internal.h