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# dirac_cppparser.h

    00001 /* ***** BEGIN LICENSE BLOCK *****
    00002 *
    00003 * $Id: dirac_cppparser.h,v 1.2 2005/01/30 05:11:41 gabest Exp $ $Name:  $
    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): Anuradha Suraparaju (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
    00038
    00039
    00040 #ifndef DIRAC_CPPPARSER_H
    00041 #define DIRAC_CPPPARSER_H
    00042
    00043 #include <istream>
    00044 #include <streambuf>
    00045 #include <libdirac_decoder/decoder_types.h> //for DecoderState
    00046 #include <libdirac_common/common.h>
    00047
    00048 namespace dirac
    00049 {
    00050     class SequenceDecompressor;
    00051     class Frame;
    00052
    00054     class InputStreamBuffer : public std::streambuf
    00055     {
    00056     public:
    00058         InputStreamBuffer ();
    00059
    00061         ~InputStreamBuffer();
    00062
    00064         std::ios::pos_type Rewind();
    00065
    00067
    00072         std::ios::pos_type Seek(std::ios::pos_type bytes,
    00073                                 std::ios::seekdir pos = std::ios::cur);
    00074
    00076         std::ios::pos_type Tell();
    00077
    00079
    00084         void Copy(char *start, int bytes);
    00085
    00087         void PurgeProcessedData();
    00088
    00089     private:
    00090
    00092         InputStreamBuffer (const InputStreamBuffer& inbuf);
    00093
    00095         InputStreamBuffer& operator = (const InputStreamBuffer& inbuf);
    00096
    00098         static const int m_buffer_size = 1232896;
    00099
    00101         char *m_chunk_buffer;
    00102     };
    00103
    00105
    00117     class DiracParser
    00118     {
    00119     public:
    00121
    00125         DiracParser(bool verbose = false );
    00126
    00128         ~DiracParser();
    00129
    00131
    00135         void SetBuffer (char *start, char *end);
    00136
    00138
    00148         DecoderState Parse();
    00149
    00151         const SeqParams& GetSeqParams() const;
    00152
    00154         const FrameParams& GetNextFrameParams() const;
    00155
    00157         const Frame& GetNextFrame() const;
    00158
    00160         const Frame& GetLastFrame() const;
    00161
    00163
    00167         void  SetSkip (bool skip);
    00168
    00169     private:
    00170
    00172         DecoderState SeekChunk();
    00173
    00175         void InitStateVars();
    00176
    00177     private:
    00178
    00180         DiracParser (const DiracParser &dp);
    00182         DiracParser& operator = (const DiracParser &dp);
    00184         DecoderState m_state;
    00186         DecoderState m_next_state;
    00188         int m_show_fnum;
    00190         SequenceDecompressor *m_decomp;
    00192         std::istream *m_istr;
    00194         InputStreamBuffer m_sbuf;
    00196         bool m_skip;
    00198         FrameSort m_skip_type;
    00200         bool m_verbose;
    00202         bool m_found_start;
    00204         bool m_found_end;
    00206         unsigned m_shift;
    00207     };
    00208
    00209 } // namespace dirac
    00210
    00211 #endif