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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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) )
147 result = TmpBuffer.Capacity(file_size);
149 if ( ASDCP_SUCCESS(result) )
150 result = Parser.OpenReadFrame((*m_CurrentFile).c_str(), TmpBuffer);
152 if ( ASDCP_SUCCESS(result) )
153 result = Parser.FillPictureDescriptor(m_PDesc);
156 if ( ASDCP_SUCCESS(result) )
157 m_PDesc.ContainerDuration = m_FileList.size();
166 ASDCP::JP2K::SequenceParser::h__SequenceParser::ReadFrame(FrameBuffer& FB)
168 if ( m_CurrentFile == m_FileList.end() )
169 return RESULT_ENDOFFILE;
172 Result_t result = m_Parser.OpenReadFrame((*m_CurrentFile).c_str(), FB);
174 if ( ASDCP_SUCCESS(result) )
176 FB.FrameNumber(m_FramesRead++);
184 //------------------------------------------------------------------------------------------
186 ASDCP::JP2K::SequenceParser::SequenceParser()
190 ASDCP::JP2K::SequenceParser::~SequenceParser()
194 // Opens the stream for reading, parses enough data to provide a complete
195 // set of stream metadata for the MXFWriter below.
197 ASDCP::JP2K::SequenceParser::OpenRead(const char* filename, bool pedantic) const
199 const_cast<ASDCP::JP2K::SequenceParser*>(this)->m_Parser = new h__SequenceParser;
201 Result_t result = m_Parser->OpenRead(filename);
203 if ( ASDCP_FAILURE(result) )
204 const_cast<ASDCP::JP2K::SequenceParser*>(this)->m_Parser.release();
209 // Rewinds the stream to the beginning.
211 ASDCP::JP2K::SequenceParser::Reset() const
213 if ( m_Parser.empty() )
216 return m_Parser->Reset();
219 // Places a frame of data in the frame buffer. Fails if the buffer is too small
220 // or the stream is empty.
222 ASDCP::JP2K::SequenceParser::ReadFrame(FrameBuffer& FB) const
224 if ( m_Parser.empty() )
227 return m_Parser->ReadFrame(FB);
231 ASDCP::JP2K::SequenceParser::FillPictureDescriptor(PictureDescriptor& PDesc) const
233 if ( m_Parser.empty() )
236 PDesc = m_Parser->m_PDesc;
242 // end JP2K_Sequence_Parser.cpp