Created by the British Broadcasting Corporation.
00001 /* ***** BEGIN LICENSE BLOCK ***** 00002 * 00003 * $Id: band_vlc.h,v 1.8 2009/02/09 09:44:56 asuraparaju Exp $ $Name: Dirac_1_0_2 $ 00004 * 00005 * Version: MPL 1.1/GPL 2.0/LGPL 2.1 00006 * 00007 * The contents of this file are subject to the Mozilla Public License 00008 * Version 1.1 (the "License"); you may not use this file except in compliance 00009 * with the License. You may obtain a copy of the License at 00010 * http://www.mozilla.org/MPL/ 00011 * 00012 * Software distributed under the License is distributed on an "AS IS" basis, 00013 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for 00014 * the specific language governing rights and limitations under the License. 00015 * 00016 * The Original Code is BBC Research and Development code. 00017 * 00018 * The Initial Developer of the Original Code is the British Broadcasting 00019 * Corporation. 00020 * Portions created by the Initial Developer are Copyright (C) 2004. 00021 * All Rights Reserved. 00022 * 00023 * Contributor(s): Thomas Davies (Original Author), 00024 * Scott R Ladd, 00025 * Steve Bearcroft 00026 * Andrew Kennedy 00027 * 00028 * Alternatively, the contents of this file may be used under the terms of 00029 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser 00030 * Public License Version 2.1 (the "LGPL"), in which case the provisions of 00031 * the GPL or the LGPL are applicable instead of those above. If you wish to 00032 * allow use of your version of this file only under the terms of the either 00033 * the GPL or LGPL and not to allow others to use your version of this file 00034 * under the MPL, indicate your decision by deleting the provisions above 00035 * and replace them with the notice and other provisions required by the GPL 00036 * or LGPL. If you do not delete the provisions above, a recipient may use 00037 * your version of this file under the terms of any one of the MPL, the GPL 00038 * or the LGPL. 00039 * ***** END LICENSE BLOCK ***** */ 00040 00041 #ifndef _BAND_VLC_H 00042 #define _BAND_VLC_H 00043 00044 #include <libdirac_common/wavelet_utils.h> 00045 #include <libdirac_common/band_codec.h> 00046 00047 00048 namespace dirac 00049 { 00050 00051 class SubbandByteIO; 00052 class ByteIO; 00053 00055 class ArithCodecToVLCAdapter 00056 { 00057 public: 00059 ArithCodecToVLCAdapter(SubbandByteIO* subband_byteio, size_t number_of_contexts); 00060 00062 virtual ~ArithCodecToVLCAdapter(){} 00063 00064 /* Compresses the input and returns the number of bits written */ 00065 int Compress (CoeffArray &in_data); 00066 00067 /* Decompresses the bitstream */ 00068 void Decompress (CoeffArray& out_data, int num_bytes); 00069 00070 /* Encodes a symbol and writes to the output */ 00071 void EncodeSymbol(bool val, int /*context_num*/) 00072 { 00073 m_byteio->WriteBit(val); 00074 } 00075 00076 /* Decodes a symbol */ 00077 bool DecodeSymbol(int /*context_num*/) 00078 { 00079 return m_byteio->ReadBoolB(); 00080 } 00081 00083 virtual void DoWorkCode(CoeffArray &in_data) = 0; 00084 00086 virtual void DoWorkDecode(CoeffArray &out_data) = 0; 00087 00088 protected: 00090 ByteIO *m_byteio; 00091 00092 private: 00094 ArithCodecToVLCAdapter(const ArithCodecToVLCAdapter& cpy); 00096 ArithCodecToVLCAdapter& operator=(const ArithCodecToVLCAdapter& rhs); 00097 }; 00098 00099 00101 00104 typedef GenericBandCodec<ArithCodecToVLCAdapter> BandVLC; 00105 00107 //Finally,special class incorporating prediction for the DC band of intra frames// 00109 00111 00115 class IntraDCBandVLC: public GenericIntraDCBandCodec<ArithCodecToVLCAdapter> 00116 { 00117 public: 00119 00124 IntraDCBandVLC(SubbandByteIO* subband_byteio, 00125 const SubbandList& band_list); 00126 private: 00128 void CodeCoeff(CoeffArray& in_data, const int xpos, const int ypos); 00129 00130 private: 00132 IntraDCBandVLC (const IntraDCBandVLC& cpy); 00133 00135 IntraDCBandVLC& operator=(const IntraDCBandVLC& rhs); 00136 }; 00137 00138 00139 }// end namespace dirac 00140 #endif
© 2004 British Broadcasting Corporation.
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