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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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&);
90 Result_t EncryptFrameBuffer(const ASDCP::FrameBuffer&, ASDCP::FrameBuffer&, AESEncContext*);
91 Result_t DecryptFrameBuffer(const ASDCP::FrameBuffer&, ASDCP::FrameBuffer&, AESDecContext*);
96 ASDCP_NO_COPY_CONSTRUCT(h__Reader);
99 Kumu::FileReader m_File;
100 OPAtomHeader m_HeaderPart;
101 Partition m_BodyPart;
102 OPAtomIndexFooter m_FooterPart;
103 ui64_t m_EssenceStart;
105 ASDCP::FrameBuffer m_CtFrameBuf;
106 Kumu::fpos_t m_LastPosition;
109 virtual ~h__Reader();
112 Result_t OpenMXFRead(const char* filename);
113 Result_t InitMXFIndex();
115 // positions file before reading
116 Result_t ReadEKLVFrame(ui32_t FrameNum, ASDCP::FrameBuffer& FrameBuf,
117 const byte_t* EssenceUL, AESDecContext* Ctx, HMACContext* HMAC);
119 // reads from current position
120 Result_t ReadEKLVPacket(ui32_t FrameNum, ASDCP::FrameBuffer& FrameBuf,
121 const byte_t* EssenceUL, AESDecContext* Ctx, HMACContext* HMAC);
126 // state machine for mxf writer
128 ST_BEGIN, // waiting for Open()
129 ST_INIT, // waiting for SetSourceStream()
130 ST_READY, // ready to write frames
131 ST_RUNNING, // one or more frames written
132 ST_FINAL, // index written, file closed
135 // implementation of h__WriterState class Goto_* methods
136 #define Goto_body(s1,s2) if ( m_State != (s1) ) \
137 return RESULT_STATE; \
143 ASDCP_NO_COPY_CONSTRUCT(h__WriterState);
146 WriterState_t m_State;
147 h__WriterState() : m_State(ST_BEGIN) {}
150 inline bool Test_BEGIN() { return m_State == ST_BEGIN; }
151 inline bool Test_INIT() { return m_State == ST_INIT; }
152 inline bool Test_READY() { return m_State == ST_READY;}
153 inline bool Test_RUNNING() { return m_State == ST_RUNNING; }
154 inline bool Test_FINAL() { return m_State == ST_FINAL; }
155 inline Result_t Goto_INIT() { Goto_body(ST_BEGIN, ST_INIT); }
156 inline Result_t Goto_READY() { Goto_body(ST_INIT, ST_READY); }
157 inline Result_t Goto_RUNNING() { Goto_body(ST_READY, ST_RUNNING); }
158 inline Result_t Goto_FINAL() { Goto_body(ST_RUNNING, ST_FINAL); }
161 typedef std::list<ui64_t*> DurationElementList_t;
166 ASDCP_NO_COPY_CONSTRUCT(h__Writer);
169 Kumu::FileWriter m_File;
171 OPAtomHeader m_HeaderPart;
172 Partition m_BodyPart;
173 OPAtomIndexFooter m_FooterPart;
174 ui64_t m_EssenceStart;
176 MaterialPackage* m_MaterialPackage;
177 SourcePackage* m_FilePackage;
179 FileDescriptor* m_EssenceDescriptor;
180 std::list<FileDescriptor*> m_EssenceSubDescriptorList;
182 ui32_t m_FramesWritten;
183 ui64_t m_StreamOffset;
184 ASDCP::FrameBuffer m_CtFrameBuf;
185 h__WriterState m_State;
187 DurationElementList_t m_DurationUpdateList;
190 virtual ~h__Writer();
193 void AddSourceClip(const MXF::Rational& EditRate, ui32_t TCFrameRate,
194 const std::string& TrackName, const UL& DataDefinition,
195 const std::string& PackageLabel);
196 void AddDMSegment(const MXF::Rational& EditRate, ui32_t TCFrameRate,
197 const std::string& TrackName, const UL& DataDefinition,
198 const std::string& PackageLabel, const UMID& PackageUID);
199 void AddEssenceDescriptor(const UL& WrappingUL);
200 Result_t CreateBodyPart(const MXF::Rational& EditRate, ui32_t BytesPerEditUnit = 0);
202 // all the above for a single source clip
203 Result_t WriteMXFHeader(const std::string& PackageLabel, const UL& WrappingUL,
204 const std::string& TrackName, const UL& DataDefinition,
205 const MXF::Rational& EditRate,
206 ui32_t TCFrameRate, ui32_t BytesPerEditUnit = 0);
208 Result_t WriteEKLVPacket(const ASDCP::FrameBuffer& FrameBuf,
209 const byte_t* EssenceUL, AESEncContext* Ctx, HMACContext* HMAC);
211 Result_t WriteMXFFooter();
216 // helper class for calculating Integrity Packs, used by WriteEKLVPacket() below.
221 byte_t Data[klv_intpack_size];
224 memset(Data, 0, klv_intpack_size);
229 Result_t CalcValues(const ASDCP::FrameBuffer&, byte_t* AssetID, ui32_t sequence, HMACContext* HMAC);
230 Result_t TestValues(const ASDCP::FrameBuffer&, byte_t* AssetID, ui32_t sequence, HMACContext* HMAC);
236 #endif // _AS_DCP_INTERNAL_H_
240 // end AS_DCP_internal.h