Dirac - A Video Codec

Created by the British Broadcasting Corporation.


parseunit_byteio.h
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1 /* ***** BEGIN LICENSE BLOCK *****
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3 * $Id: parseunit_byteio.h,v 1.11 2008/05/02 05:57:19 asuraparaju Exp $ $Name: Dirac_1_0_2 $
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5 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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16 * The Original Code is BBC Research and Development code.
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23 * Contributor(s): Andrew Kennedy (Original Author)
24 * Anuradha Suraparaju
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38 
42 #ifndef parseunit_byteio_h
43 #define parseunit_byteio_h
44 
45 //SYSTEM INLUDES
46 #include <map> // Byte-map
47 #include <string> // stores values
48 
49 //LOCAL INCLUDES
50 #include "byteio.h" // Parent class
51 
52 
53 namespace dirac
54 {
55 
56  /* Types of parse-unit */
57  typedef enum {
66  } ParseUnitType;
67 
72  class ParseUnitByteIO : public ByteIO
73  {
74  public:
75 
80 
85  ParseUnitByteIO(const ByteIO& byte_io);
86 
91  ParseUnitByteIO(const ParseUnitByteIO& parseunit_byteio);
92 
97 
102  virtual void CollateByteStats(DiracByteStats& dirac_byte_stats);
103 
108  bool Input(); // decoding
109 
113  bool IsValid();
114 
119  bool CanSkip();
120 
124  virtual const std::string GetBytes(); // encoding
125 
130  void SetAdjacentParseUnits(ParseUnitByteIO *p_prev_parseunit); // encoding
131 
132  /*
133  * Gets number of bytes input/output within unit
134  */
135  virtual int GetSize() const;
136 
140  int GetNextParseOffset() const;
141 
145  int GetPreviousParseOffset() const;
146 
150  virtual ParseUnitType GetType() const;
151 
155  bool IsSeqHeader() const
156  { return m_parse_code==0x00; }
157 
161  bool IsEndOfSequence() const
162  { return m_parse_code==0x10; }
163 
167  bool IsAuxiliaryData() const
168  { return (m_parse_code&0xF8)==0x20; }
169 
173  bool IsPaddingData() const
174  { return m_parse_code==0x30; }
175 
179  bool IsPicture() const
180  { return ((m_parse_code&0x08)==0x08); }
181 
185  bool IsLowDelay() const
186  { return ((m_parse_code&0x88)==0x88); }
187 
191  bool IsCoreSyntax() const
192  { return ((m_parse_code&0x88)==0x08); }
193 
197  bool IsUsingAC() const
198  { return ((m_parse_code&0x48)==0x08); }
199 
200  protected:
201 
206  virtual int CalcNextUnitOffset();
207 
212  virtual unsigned char CalcParseCode() const { return 0;} // encoding
213 
218  bool SyncToUnitStart(); // decoding
219 
223  unsigned char GetParseCode() const { return m_parse_code;}
224 
225  private:
226 
231 
236 
240  unsigned char m_parse_code;
241 
242  };
243 
244 
245 } // namespace dirac
246 
247 #endif

© 2004 British Broadcasting Corporation. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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