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
8 1. Redistributions of source code must retain the above copyright
9 notice, this list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
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.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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);
80 static byte_t OPAtom_Data[SMPTE_UL_LENGTH] =
81 { 0x06, 0x0e, 0x2b, 0x34, 0x04, 0x01, 0x01, 0x01,
82 0x0d, 0x01, 0x02, 0x01, 0x10, 0x00, 0x00, 0x00 };
83 static UL OPAtomUL(OPAtom_Data);
85 static const byte_t CryptEssenceUL_Data[SMPTE_UL_LENGTH] =
86 { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x04, 0x01, 0x07,
87 0x0d, 0x01, 0x03, 0x01, 0x02, 0x7e, 0x01, 0x00 };
89 // the check value for EKLV packets
91 static const byte_t ESV_CheckValue[CBC_BLOCK_SIZE] =
92 { 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b,
93 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b };
95 //------------------------------------------------------------------------------------------
98 Result_t MD_to_WriterInfo(MXF::Identification*, WriterInfo&);
99 Result_t MD_to_CryptoInfo(MXF::CryptographicContext*, WriterInfo&);
100 Result_t EncryptFrameBuffer(const ASDCP::FrameBuffer&, ASDCP::FrameBuffer&, AESEncContext*);
101 Result_t DecryptFrameBuffer(const ASDCP::FrameBuffer&, ASDCP::FrameBuffer&, AESDecContext*);
106 ASDCP_NO_COPY_CONSTRUCT(h__Reader);
110 OPAtomHeader m_HeaderPart;
111 Partition m_BodyPart;
112 OPAtomIndexFooter m_FooterPart;
113 ui64_t m_EssenceStart;
115 ASDCP::FrameBuffer m_CtFrameBuf;
116 fpos_t m_LastPosition;
119 virtual ~h__Reader();
121 Result_t InitInfo(WriterInfo& Info);
122 Result_t OpenMXFRead(const char* filename);
123 Result_t InitMXFIndex();
124 Result_t ReadEKLVPacket(ui32_t FrameNum, ASDCP::FrameBuffer& FrameBuf,
125 const byte_t* EssenceUL, AESDecContext* Ctx, HMACContext* HMAC);
130 // state machine for mxf writer
132 ST_BEGIN, // waiting for Open()
133 ST_INIT, // waiting for SetSourceStream()
134 ST_READY, // ready to write frames
135 ST_RUNNING, // one or more frames written
136 ST_FINAL, // index written, file closed
139 // implementation of h__WriterState class Goto_* methods
140 #define Goto_body(s1,s2) if ( m_State != (s1) ) \
141 return RESULT_STATE; \
147 ASDCP_NO_COPY_CONSTRUCT(h__WriterState);
150 WriterState_t m_State;
151 h__WriterState() : m_State(ST_BEGIN) {}
154 inline bool Test_BEGIN() { return m_State == ST_BEGIN; }
155 inline bool Test_INIT() { return m_State == ST_INIT; }
156 inline bool Test_READY() { return m_State == ST_READY;}
157 inline bool Test_RUNNING() { return m_State == ST_RUNNING; }
158 inline bool Test_FINAL() { return m_State == ST_FINAL; }
159 inline Result_t Goto_INIT() { Goto_body(ST_BEGIN, ST_INIT); }
160 inline Result_t Goto_READY() { Goto_body(ST_INIT, ST_READY); }
161 inline Result_t Goto_RUNNING() { Goto_body(ST_READY, ST_RUNNING); }
162 inline Result_t Goto_FINAL() { Goto_body(ST_RUNNING, ST_FINAL); }
168 ASDCP_NO_COPY_CONSTRUCT(h__Writer);
173 OPAtomHeader m_HeaderPart;
174 Partition m_BodyPart;
175 OPAtomIndexFooter m_FooterPart;
176 ui64_t m_EssenceStart;
178 MaterialPackage* m_MaterialPackage;
179 Sequence* m_MPTCSequence;
180 TimecodeComponent* m_MPTimecode;
181 Sequence* m_MPClSequence;
182 SourceClip* m_MPClip; //! Material Package SourceClip for each essence stream
184 SourcePackage* m_FilePackage;
185 Sequence* m_FPTCSequence;
186 TimecodeComponent* m_FPTimecode;
187 Sequence* m_FPClSequence;
188 SourceClip* m_FPClip; //! File Package SourceClip for each essence stream
190 FileDescriptor* m_EssenceDescriptor;
192 ui32_t m_FramesWritten;
193 ui64_t m_StreamOffset;
194 ASDCP::FrameBuffer m_CtFrameBuf;
195 h__WriterState m_State;
199 virtual ~h__Writer();
201 Result_t WriteMXFHeader(const std::string& PackageLabel, const UL& WrappingUL,
202 const std::string& TrackName, const UL& DataDefinition,
203 const MXF::Rational& EditRate,
204 ui32_t TCFrameRate, ui32_t BytesPerEditUnit = 0);
206 Result_t WriteEKLVPacket(const ASDCP::FrameBuffer& FrameBuf,
207 const byte_t* EssenceUL, AESEncContext* Ctx, HMACContext* HMAC);
209 Result_t WriteMXFFooter();
214 // helper class for calculating Integrity Packs, used by WriteEKLVPacket() below.
219 byte_t Data[klv_intpack_size];
222 memset(Data, 0, klv_intpack_size);
227 Result_t CalcValues(const ASDCP::FrameBuffer&, byte_t* AssetID, ui32_t sequence, HMACContext* HMAC);
228 Result_t TestValues(const ASDCP::FrameBuffer&, byte_t* AssetID, ui32_t sequence, HMACContext* HMAC);
237 ui32_t m_HeaderLength;
239 ASDCP_NO_COPY_CONSTRUCT(KLVReader);
242 KLVReader() : m_Length(0), m_BERLength(0), m_HeaderLength(0) {}
245 inline const byte_t* Key() { return m_Key; }
246 inline const ui64_t Length() { return m_Length; }
247 inline const ui64_t KLLength() { return m_BERLength + SMPTE_UL_LENGTH; }
248 Result_t ReadKLFromFile(ASDCP::FileReader& Reader);
253 #endif // _AS_DCP_INTERNAL_H__
257 // end AS_DCP_internal.h