# 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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