Dirac - A Video Codec

Created by the British Broadcasting Corporation.


band_vlc.h
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3 * $Id: band_vlc.h,v 1.8 2009/02/09 09:44:56 asuraparaju Exp $ $Name: Dirac_1_0_2 $
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24 * Scott R Ladd,
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26 * Andrew Kennedy
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40 
41 #ifndef _BAND_VLC_H
42 #define _BAND_VLC_H
43 
46 
47 
48 namespace dirac
49 {
50 
51  class SubbandByteIO;
52  class ByteIO;
53 
56  {
57  public:
59  ArithCodecToVLCAdapter(SubbandByteIO* subband_byteio, size_t number_of_contexts);
60 
63 
64  /* Compresses the input and returns the number of bits written */
65  int Compress (CoeffArray &in_data);
66 
67  /* Decompresses the bitstream */
68  void Decompress (CoeffArray& out_data, int num_bytes);
69 
70  /* Encodes a symbol and writes to the output */
71  void EncodeSymbol(bool val, int /*context_num*/)
72  {
73  m_byteio->WriteBit(val);
74  }
75 
76  /* Decodes a symbol */
77  bool DecodeSymbol(int /*context_num*/)
78  {
79  return m_byteio->ReadBoolB();
80  }
81 
83  virtual void DoWorkCode(CoeffArray &in_data) = 0;
84 
86  virtual void DoWorkDecode(CoeffArray &out_data) = 0;
87 
88  protected:
91 
92  private:
97  };
98 
99 
101 
105 
107  //Finally,special class incorporating prediction for the DC band of intra frames//
109 
111 
115  class IntraDCBandVLC: public GenericIntraDCBandCodec<ArithCodecToVLCAdapter>
116  {
117  public:
119 
124  IntraDCBandVLC(SubbandByteIO* subband_byteio,
125  const SubbandList& band_list);
126  private:
128  void CodeCoeff(CoeffArray& in_data, const int xpos, const int ypos);
129 
130  private:
132  IntraDCBandVLC (const IntraDCBandVLC& cpy);
133 
136  };
137 
138 
139 }// end namespace dirac
140 #endif

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