# 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 1.11 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.
HTML documentation generated by Dimitri van Heesch's excellent Doxygen tool.