# Dirac - A Video Codec

Created by the British Broadcasting Corporation.

# parseunit_byteio.h

Go to the documentation of this file.

    00001 /* ***** BEGIN LICENSE BLOCK *****
    00002 *
    00003 * $Id: parseunit_byteio.h,v 1.1 2006/04/20 10:41:56 asuraparaju Exp $ $Name: Dirac_0_6_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_UNDEFINED
    00061     } ParseUnitType;
    00062
    00067     class ParseUnitByteIO : public ByteIO
    00068     {
    00069     public:
    00070
    00075         ParseUnitByteIO(int accessunit_fnum);
    00076
    00081         ParseUnitByteIO(const ByteIO& byte_io);
    00082
    00088         ParseUnitByteIO(int accessunit_fnum,
    00089                         const ParseUnitByteIO& parseunit_byteio);
    00090
    00094         ~ParseUnitByteIO();
    00095
    00100         virtual void CollateByteStats(DiracByteStats& dirac_byte_stats);
    00101
    00106         bool Input(); // decoding
    00107
    00112         bool IsValid(const ParseUnitByteIO& next_unit);
    00113
    00118         bool Skip();
    00119
    00123         virtual const std::string GetBytes();   // encoding
    00124
    00129         void SetAdjacentParseUnits(ParseUnitByteIO *p_prev_parseunit);  // encoding
    00130
    00131         /*
    00132         * Gets number of bytes input/output within unit
    00133         */
    00134         virtual int GetSize() const;
    00135
    00139         int GetNextParseOffset() const;
    00140
    00144         int GetPreviousParseOffset() const;
    00145
    00149         virtual ParseUnitType GetType() const;
    00150
    00151     protected:
    00152
    00157         virtual int CalcNextUnitOffset();
    00158
    00163         virtual unsigned char CalcParseCode() const { return 0;}    // encoding
    00164
    00169         bool SyncToUnitStart();   // decoding
    00170
    00174         int m_accessunit_fnum;
    00175
    00179         unsigned char GetParseCode() const { return m_parse_code;}
    00180
    00181     private:
    00182
    00186         int m_previous_parse_offset;
    00187
    00191         int m_next_parse_offset;
    00192
    00196         unsigned char m_parse_code;
    00197
    00198     };
    00199
    00200
    00201 } // namespace dirac
    00202
    00203 #endif

© 2004 British Broadcasting Corporation. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
HTML documentation generated by Dimitri van Heesch's excellent Doxygen tool.