Dirac - A Video Codec

Created by the British Broadcasting Corporation.


parseunit_byteio.h

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00001 /* ***** BEGIN LICENSE BLOCK *****
00002 *
00003 * $Id: parseunit_byteio.h,v 1.2 2007/05/02 13:10:27 asuraparaju Exp $ $Name: Dirac_0_7_0 $
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): Andrew Kennedy (Original Author)
00024 *
00025 * Alternatively, the contents of this file may be used under the terms of
00026 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
00027 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
00028 * the GPL or the LGPL are applicable instead of those above. If you wish to
00029 * allow use of your version of this file only under the terms of the either
00030 * the GPL or LGPL and not to allow others to use your version of this file
00031 * under the MPL, indicate your decision by deleting the provisions above
00032 * and replace them with the notice and other provisions required by the GPL
00033 * or LGPL. If you do not delete the provisions above, a recipient may use
00034 * your version of this file under the terms of any one of the MPL, the GPL
00035 * or the LGPL.
00036 * ***** END LICENSE BLOCK ***** */
00037 
00041 #ifndef parseunit_byteio_h
00042 #define parseunit_byteio_h
00043 
00044 //SYSTEM INLUDES
00045 #include <map>                  // Byte-map
00046 #include <string>               // stores values
00047 
00048 //LOCAL INCLUDES
00049 #include "byteio.h"             // Parent class
00050 
00051 
00052 namespace dirac
00053 {
00054 
00055     /* Types of parse-unit */
00056     typedef enum {
00057         PU_ACCESS_UNIT=0,
00058         PU_FRAME,
00059         PU_END_OF_SEQUENCE,
00060         PU_AUXILIARY_DATA,
00061         PU_PADDING_DATA,
00062         PU_LOW_DELAY_FRAME,
00063         PU_UNDEFINED
00064     } ParseUnitType;
00065     
00070     class ParseUnitByteIO : public ByteIO
00071     {
00072     public:
00073 
00078         ParseUnitByteIO(int accessunit_fnum);
00079 
00084         ParseUnitByteIO(const ByteIO& byte_io);
00085 
00091         ParseUnitByteIO(int accessunit_fnum,
00092                         const ParseUnitByteIO& parseunit_byteio);
00093 
00097         ~ParseUnitByteIO();
00098 
00103         virtual void CollateByteStats(DiracByteStats& dirac_byte_stats);
00104 
00109         bool Input(); // decoding
00110 
00115         bool IsValid(const ParseUnitByteIO& next_unit);
00116 
00121         bool Skip();
00122       
00126         virtual const std::string GetBytes();   // encoding
00127 
00132         void SetAdjacentParseUnits(ParseUnitByteIO *p_prev_parseunit);  // encoding
00133 
00134         /*
00135         * Gets number of bytes input/output within unit
00136         */
00137         virtual int GetSize() const;
00138 
00142         int GetNextParseOffset() const;
00143 
00147         int GetPreviousParseOffset() const;
00148 
00152         virtual ParseUnitType GetType() const;
00153 
00154     protected:
00155 
00160         virtual int CalcNextUnitOffset();
00161 
00166         virtual unsigned char CalcParseCode() const { return 0;}    // encoding
00167 
00172         bool SyncToUnitStart();   // decoding
00173 
00177         int m_accessunit_fnum;
00178 
00182         unsigned char GetParseCode() const { return m_parse_code;}
00183 
00184     private:
00185 
00189         int m_previous_parse_offset;
00190 
00194         int m_next_parse_offset;
00195 
00199         unsigned char m_parse_code;
00200 
00201     };
00202 
00203 
00204 } // namespace dirac
00205 
00206 #endif

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