2 Copyright (c) 2004-2005, John Hurst
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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 JP2K_Sequence_Parser.cpp
29 \brief AS-DCP library, JPEG 2000 codestream essence reader implementation
33 #include <KM_fileio.h>
40 using namespace ASDCP;
43 //------------------------------------------------------------------------------------------
45 class FileList : public std::list<std::string>
47 std::string m_DirName;
54 Result_t InitFromDirectory(const char* path)
56 char next_file[Kumu::MaxFilePath];
57 Kumu::DirScanner Scanner;
59 Result_t result = Scanner.Open(path);
61 if ( ASDCP_SUCCESS(result) )
65 while ( ASDCP_SUCCESS(Scanner.GetNext(next_file)) )
67 if ( next_file[0] == '.' ) // no hidden files or internal links
70 std::string Str(m_DirName);
83 //------------------------------------------------------------------------------------------
85 class ASDCP::JP2K::SequenceParser::h__SequenceParser
88 Rational m_PictureRate;
90 FileList::iterator m_CurrentFile;
91 CodestreamParser m_Parser;
93 ASDCP_NO_COPY_CONSTRUCT(h__SequenceParser);
96 PictureDescriptor m_PDesc;
98 h__SequenceParser() : m_FramesRead(0)
100 memset(&m_PDesc, 0, sizeof(m_PDesc));
101 m_PDesc.EditRate = Rational(24,1);
109 Result_t OpenRead(const char* filename);
115 m_CurrentFile = m_FileList.begin();
119 Result_t ReadFrame(FrameBuffer&);
125 ASDCP::JP2K::SequenceParser::h__SequenceParser::OpenRead(const char* filename)
127 ASDCP_TEST_NULL_STR(filename);
129 Result_t result = m_FileList.InitFromDirectory(filename);
131 if ( m_FileList.empty() )
132 return RESULT_ENDOFFILE;
134 if ( ASDCP_SUCCESS(result) )
136 m_CurrentFile = m_FileList.begin();
138 CodestreamParser Parser;
139 FrameBuffer TmpBuffer;
141 Kumu::fsize_t file_size = Kumu::FileSize((*m_CurrentFile).c_str());
143 if ( file_size == 0 )
144 result = RESULT_NOT_FOUND;
146 if ( ASDCP_SUCCESS(result) )
148 assert(file_size <= 0xFFFFFFFFL);
149 result = TmpBuffer.Capacity((ui32_t) file_size);
152 if ( ASDCP_SUCCESS(result) )
153 result = Parser.OpenReadFrame((*m_CurrentFile).c_str(), TmpBuffer);
155 if ( ASDCP_SUCCESS(result) )
156 result = Parser.FillPictureDescriptor(m_PDesc);
159 if ( ASDCP_SUCCESS(result) )
160 m_PDesc.ContainerDuration = m_FileList.size();
169 ASDCP::JP2K::SequenceParser::h__SequenceParser::ReadFrame(FrameBuffer& FB)
171 if ( m_CurrentFile == m_FileList.end() )
172 return RESULT_ENDOFFILE;
175 Result_t result = m_Parser.OpenReadFrame((*m_CurrentFile).c_str(), FB);
177 if ( ASDCP_SUCCESS(result) )
179 FB.FrameNumber(m_FramesRead++);
187 //------------------------------------------------------------------------------------------
189 ASDCP::JP2K::SequenceParser::SequenceParser()
193 ASDCP::JP2K::SequenceParser::~SequenceParser()
197 // Opens the stream for reading, parses enough data to provide a complete
198 // set of stream metadata for the MXFWriter below.
200 ASDCP::JP2K::SequenceParser::OpenRead(const char* filename, bool pedantic) const
202 const_cast<ASDCP::JP2K::SequenceParser*>(this)->m_Parser = new h__SequenceParser;
204 Result_t result = m_Parser->OpenRead(filename);
206 if ( ASDCP_FAILURE(result) )
207 const_cast<ASDCP::JP2K::SequenceParser*>(this)->m_Parser.release();
212 // Rewinds the stream to the beginning.
214 ASDCP::JP2K::SequenceParser::Reset() const
216 if ( m_Parser.empty() )
219 return m_Parser->Reset();
222 // Places a frame of data in the frame buffer. Fails if the buffer is too small
223 // or the stream is empty.
225 ASDCP::JP2K::SequenceParser::ReadFrame(FrameBuffer& FB) const
227 if ( m_Parser.empty() )
230 return m_Parser->ReadFrame(FB);
234 ASDCP::JP2K::SequenceParser::FillPictureDescriptor(PictureDescriptor& PDesc) const
236 if ( m_Parser.empty() )
239 PDesc = m_Parser->m_PDesc;
245 // end JP2K_Sequence_Parser.cpp