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 1.11 2008/05/02 05:57:19 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): Andrew Kennedy (Original Author)
00024 *                 Anuradha Suraparaju
00025 *
00026 * Alternatively, the contents of this file may be used under the terms of
00027 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
00028 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
00029 * the GPL or the LGPL are applicable instead of those above. If you wish to
00030 * allow use of your version of this file only under the terms of the either
00031 * the GPL or LGPL and not to allow others to use your version of this file
00032 * under the MPL, indicate your decision by deleting the provisions above
00033 * and replace them with the notice and other provisions required by the GPL
00034 * or LGPL. If you do not delete the provisions above, a recipient may use
00035 * your version of this file under the terms of any one of the MPL, the GPL
00036 * or the LGPL.
00037 * ***** END LICENSE BLOCK ***** */
00038 
00042 #ifndef parseunit_byteio_h
00043 #define parseunit_byteio_h
00044 
00045 //SYSTEM INLUDES
00046 #include <map>                  // Byte-map
00047 #include <string>               // stores values
00048 
00049 //LOCAL INCLUDES
00050 #include "byteio.h"             // Parent class
00051 
00052 
00053 namespace dirac
00054 {
00055 
00056     /* Types of parse-unit */
00057     typedef enum {
00058         PU_SEQ_HEADER=0,
00059         PU_PICTURE,
00060         PU_END_OF_SEQUENCE,
00061         PU_AUXILIARY_DATA,
00062         PU_PADDING_DATA,
00063         PU_CORE_PICTURE,
00064         PU_LOW_DELAY_PICTURE,
00065         PU_UNDEFINED
00066     } ParseUnitType;
00067 
00072     class ParseUnitByteIO : public ByteIO
00073     {
00074     public:
00075 
00079         ParseUnitByteIO();
00080 
00085         ParseUnitByteIO(const ByteIO& byte_io);
00086 
00091         ParseUnitByteIO(const ParseUnitByteIO& parseunit_byteio);
00092 
00096         ~ParseUnitByteIO();
00097 
00102         virtual void CollateByteStats(DiracByteStats& dirac_byte_stats);
00103 
00108         bool Input(); // decoding
00109 
00113         bool IsValid();
00114 
00119         bool CanSkip();
00120 
00124         virtual const std::string GetBytes();   // encoding
00125 
00130         void SetAdjacentParseUnits(ParseUnitByteIO *p_prev_parseunit);  // encoding
00131 
00132         /*
00133         * Gets number of bytes input/output within unit
00134         */
00135         virtual int GetSize() const;
00136 
00140         int GetNextParseOffset() const;
00141 
00145         int GetPreviousParseOffset() const;
00146 
00150         virtual ParseUnitType GetType() const;
00151 
00155         bool IsSeqHeader() const
00156         { return m_parse_code==0x00; }
00157 
00161         bool IsEndOfSequence() const
00162         { return m_parse_code==0x10; }
00163 
00167         bool IsAuxiliaryData() const
00168         { return (m_parse_code&0xF8)==0x20; }
00169 
00173         bool IsPaddingData() const
00174         { return m_parse_code==0x30; }
00175 
00179         bool IsPicture() const
00180         { return ((m_parse_code&0x08)==0x08); }
00181 
00185         bool IsLowDelay() const
00186         { return ((m_parse_code&0x88)==0x88); }
00187 
00191         bool IsCoreSyntax() const
00192         { return ((m_parse_code&0x88)==0x08); }
00193 
00197         bool IsUsingAC() const
00198         { return ((m_parse_code&0x48)==0x08); }
00199 
00200     protected:
00201 
00206         virtual int CalcNextUnitOffset();
00207 
00212         virtual unsigned char CalcParseCode() const { return 0;}    // encoding
00213 
00218         bool SyncToUnitStart();   // decoding
00219 
00223         unsigned char GetParseCode() const { return m_parse_code;}
00224 
00225     private:
00226 
00230         int m_previous_parse_offset;
00231 
00235         int m_next_parse_offset;
00236 
00240         unsigned char m_parse_code;
00241 
00242     };
00243 
00244 
00245 } // namespace dirac
00246 
00247 #endif

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