# Dirac - A Video Codec

Created by the British Broadcasting Corporation.

# band_vlc.h

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    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. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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