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/* ***** BEGIN LICENSE BLOCK *****
*
* $Id: band_vlc.h,v 1.8 2009/02/09 09:44:56 asuraparaju Exp $ $Name: $
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* The Original Code is BBC Research and Development code.
*
* The Initial Developer of the Original Code is the British Broadcasting
* Corporation.
* Portions created by the Initial Developer are Copyright (C) 2004.
* All Rights Reserved.
*
* Contributor(s): Thomas Davies (Original Author),
* Scott R Ladd,
* Steve Bearcroft
* Andrew Kennedy
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
* Public License Version 2.1 (the "LGPL"), in which case the provisions of
* the GPL or the LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the either
* the GPL or LGPL and not to allow others to use your version of this file
* under the MPL, indicate your decision by deleting the provisions above
* and replace them with the notice and other provisions required by the GPL
* or LGPL. If you do not delete the provisions above, a recipient may use
* your version of this file under the terms of any one of the MPL, the GPL
* or the LGPL.
* ***** END LICENSE BLOCK ***** */
#ifndef _BAND_VLC_H
#define _BAND_VLC_H
#include <libdirac_common/wavelet_utils.h>
#include <libdirac_common/band_codec.h>
namespace dirac
{
class SubbandByteIO;
class ByteIO;
/*! Abstract VLC entropy codec base class */
class ArithCodecToVLCAdapter
{
public:
/*! Constructor */
ArithCodecToVLCAdapter(SubbandByteIO* subband_byteio, size_t number_of_contexts);
/*! Virtual Destructor */
virtual ~ArithCodecToVLCAdapter() {}
/* Compresses the input and returns the number of bits written */
int Compress(CoeffArray &in_data);
/* Decompresses the bitstream */
void Decompress(CoeffArray& out_data, int num_bytes);
/* Encodes a symbol and writes to the output */
void EncodeSymbol(bool val, int /*context_num*/)
{
m_byteio->WriteBit(val);
}
/* Decodes a symbol */
bool DecodeSymbol(int /*context_num*/)
{
return m_byteio->ReadBoolB();
}
/*! Purely virtual function that does the actual encoding. Derived classes must define it */
virtual void DoWorkCode(CoeffArray &in_data) = 0;
/*! Purely virtual function that does the actual decoding. Derived classes must define it */
virtual void DoWorkDecode(CoeffArray &out_data) = 0;
protected:
/*! Input/output stream for Dirac-format bytes */
ByteIO *m_byteio;
private:
//! Private, bodyless copy constructor: class should not be copied
ArithCodecToVLCAdapter(const ArithCodecToVLCAdapter& cpy);
//! Private, bodyless copy operator=: class should not be assigned
ArithCodecToVLCAdapter& operator=(const ArithCodecToVLCAdapter& rhs);
};
//! A general class for coding and decoding wavelet subband data using variable length coding.
/*!
A general class for coding and decoding wavelet subband data using variable length coding,
*/
typedef GenericBandCodec<ArithCodecToVLCAdapter> BandVLC;
//////////////////////////////////////////////////////////////////////////////////
//Finally,special class incorporating prediction for the DC band of intra frames//
//////////////////////////////////////////////////////////////////////////////////
//! A class specially for coding the DC subband of Intra frames
/*!
A class specially for coding the DC subband of Intra frames, using intra-band prediction
of coefficients.
*/
class IntraDCBandVLC: public GenericIntraDCBandCodec<ArithCodecToVLCAdapter>
{
public:
//! Constructor
/*!
Creates a IntraDCBandVLC object to encode subband data, based on parameters
\param subband_byteio input/output for the encoded bits
\param band_list the set of all the subbands
*/
IntraDCBandVLC(SubbandByteIO* subband_byteio,
const SubbandList& band_list);
private:
//! Encode a single coefficient using error-feedback DC quantization
void CodeCoeff(CoeffArray& in_data, const int xpos, const int ypos);
private:
//! Private, bodyless copy constructor: class should not be copied
IntraDCBandVLC(const IntraDCBandVLC& cpy);
//! Private, bodyless copy operator=: class should not be assigned
IntraDCBandVLC& operator=(const IntraDCBandVLC& rhs);
};
}// end namespace dirac
#endif
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